7048 lines
175 KiB
C
7048 lines
175 KiB
C
/*
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* NET3 Protocol independent device support routines.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Derived from the non IP parts of dev.c 1.0.19
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Mark Evans, <evansmp@uhura.aston.ac.uk>
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*
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* Additional Authors:
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* Florian la Roche <rzsfl@rz.uni-sb.de>
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* Alan Cox <gw4pts@gw4pts.ampr.org>
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* David Hinds <dahinds@users.sourceforge.net>
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* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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* Adam Sulmicki <adam@cfar.umd.edu>
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* Pekka Riikonen <priikone@poesidon.pspt.fi>
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*
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* Changes:
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* D.J. Barrow : Fixed bug where dev->refcnt gets set
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* to 2 if register_netdev gets called
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* before net_dev_init & also removed a
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* few lines of code in the process.
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* Alan Cox : device private ioctl copies fields back.
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* Alan Cox : Transmit queue code does relevant
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* stunts to keep the queue safe.
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* Alan Cox : Fixed double lock.
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* Alan Cox : Fixed promisc NULL pointer trap
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* ???????? : Support the full private ioctl range
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* Alan Cox : Moved ioctl permission check into
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* drivers
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* Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
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* Alan Cox : 100 backlog just doesn't cut it when
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* you start doing multicast video 8)
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* Alan Cox : Rewrote net_bh and list manager.
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* Alan Cox : Fix ETH_P_ALL echoback lengths.
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* Alan Cox : Took out transmit every packet pass
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* Saved a few bytes in the ioctl handler
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* Alan Cox : Network driver sets packet type before
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* calling netif_rx. Saves a function
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* call a packet.
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* Alan Cox : Hashed net_bh()
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* Richard Kooijman: Timestamp fixes.
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* Alan Cox : Wrong field in SIOCGIFDSTADDR
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* Alan Cox : Device lock protection.
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* Alan Cox : Fixed nasty side effect of device close
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* changes.
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* Rudi Cilibrasi : Pass the right thing to
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* set_mac_address()
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* Dave Miller : 32bit quantity for the device lock to
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* make it work out on a Sparc.
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* Bjorn Ekwall : Added KERNELD hack.
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* Alan Cox : Cleaned up the backlog initialise.
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* Craig Metz : SIOCGIFCONF fix if space for under
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* 1 device.
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* Thomas Bogendoerfer : Return ENODEV for dev_open, if there
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* is no device open function.
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* Andi Kleen : Fix error reporting for SIOCGIFCONF
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* Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
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* Cyrus Durgin : Cleaned for KMOD
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* Adam Sulmicki : Bug Fix : Network Device Unload
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* A network device unload needs to purge
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* the backlog queue.
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* Paul Rusty Russell : SIOCSIFNAME
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* Pekka Riikonen : Netdev boot-time settings code
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* Andrew Morton : Make unregister_netdevice wait
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* indefinitely on dev->refcnt
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* J Hadi Salim : - Backlog queue sampling
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* - netif_rx() feedback
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*/
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#include <asm/uaccess.h>
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#include <linux/bitops.h>
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#include <linux/capability.h>
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#include <linux/cpu.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/hash.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/if_ether.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/notifier.h>
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#include <linux/skbuff.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <linux/rtnetlink.h>
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#include <linux/stat.h>
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#include <net/dst.h>
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#include <net/pkt_sched.h>
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#include <net/checksum.h>
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#include <net/xfrm.h>
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#include <linux/highmem.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netpoll.h>
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#include <linux/rcupdate.h>
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#include <linux/delay.h>
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#include <net/iw_handler.h>
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#include <asm/current.h>
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#include <linux/audit.h>
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#include <linux/dmaengine.h>
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#include <linux/err.h>
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#include <linux/ctype.h>
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#include <linux/if_arp.h>
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <net/ip.h>
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#include <linux/ipv6.h>
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#include <linux/in.h>
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#include <linux/jhash.h>
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#include <linux/random.h>
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#include <trace/events/napi.h>
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#include <trace/events/net.h>
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#include <trace/events/skb.h>
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#include <linux/pci.h>
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#include <linux/inetdevice.h>
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#include <linux/cpu_rmap.h>
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#include <linux/static_key.h>
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#include <linux/hashtable.h>
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#include <linux/vmalloc.h>
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#include <linux/if_macvlan.h>
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#include "net-sysfs.h"
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/* Instead of increasing this, you should create a hash table. */
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#define MAX_GRO_SKBS 8
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/* This should be increased if a protocol with a bigger head is added. */
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#define GRO_MAX_HEAD (MAX_HEADER + 128)
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static DEFINE_SPINLOCK(ptype_lock);
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static DEFINE_SPINLOCK(offload_lock);
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struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
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struct list_head ptype_all __read_mostly; /* Taps */
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static struct list_head offload_base __read_mostly;
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static int netif_rx_internal(struct sk_buff *skb);
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/*
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* The @dev_base_head list is protected by @dev_base_lock and the rtnl
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* semaphore.
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*
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* Pure readers hold dev_base_lock for reading, or rcu_read_lock()
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*
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* Writers must hold the rtnl semaphore while they loop through the
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* dev_base_head list, and hold dev_base_lock for writing when they do the
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* actual updates. This allows pure readers to access the list even
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* while a writer is preparing to update it.
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*
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* To put it another way, dev_base_lock is held for writing only to
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* protect against pure readers; the rtnl semaphore provides the
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* protection against other writers.
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*
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* See, for example usages, register_netdevice() and
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* unregister_netdevice(), which must be called with the rtnl
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* semaphore held.
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*/
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DEFINE_RWLOCK(dev_base_lock);
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EXPORT_SYMBOL(dev_base_lock);
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/* protects napi_hash addition/deletion and napi_gen_id */
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static DEFINE_SPINLOCK(napi_hash_lock);
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static unsigned int napi_gen_id;
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static DEFINE_HASHTABLE(napi_hash, 8);
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static seqcount_t devnet_rename_seq;
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static inline void dev_base_seq_inc(struct net *net)
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{
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while (++net->dev_base_seq == 0);
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}
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static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
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{
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unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
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return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
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}
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static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
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{
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return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
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}
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static inline void rps_lock(struct softnet_data *sd)
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{
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#ifdef CONFIG_RPS
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spin_lock(&sd->input_pkt_queue.lock);
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#endif
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}
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static inline void rps_unlock(struct softnet_data *sd)
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{
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#ifdef CONFIG_RPS
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spin_unlock(&sd->input_pkt_queue.lock);
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#endif
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}
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/* Device list insertion */
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static void list_netdevice(struct net_device *dev)
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{
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struct net *net = dev_net(dev);
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ASSERT_RTNL();
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write_lock_bh(&dev_base_lock);
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list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
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hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
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hlist_add_head_rcu(&dev->index_hlist,
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dev_index_hash(net, dev->ifindex));
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write_unlock_bh(&dev_base_lock);
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dev_base_seq_inc(net);
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}
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/* Device list removal
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* caller must respect a RCU grace period before freeing/reusing dev
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*/
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static void unlist_netdevice(struct net_device *dev)
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{
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ASSERT_RTNL();
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/* Unlink dev from the device chain */
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write_lock_bh(&dev_base_lock);
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list_del_rcu(&dev->dev_list);
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hlist_del_rcu(&dev->name_hlist);
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hlist_del_rcu(&dev->index_hlist);
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write_unlock_bh(&dev_base_lock);
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dev_base_seq_inc(dev_net(dev));
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}
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/*
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* Our notifier list
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*/
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static RAW_NOTIFIER_HEAD(netdev_chain);
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/*
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* Device drivers call our routines to queue packets here. We empty the
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* queue in the local softnet handler.
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*/
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DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
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EXPORT_PER_CPU_SYMBOL(softnet_data);
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#ifdef CONFIG_LOCKDEP
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/*
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* register_netdevice() inits txq->_xmit_lock and sets lockdep class
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* according to dev->type
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*/
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static const unsigned short netdev_lock_type[] =
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{ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
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ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
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ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
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ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
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ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
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ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
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ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
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ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
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ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
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ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
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ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
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ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
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ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
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ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
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ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
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static const char *const netdev_lock_name[] =
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{"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
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"_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
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"_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
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"_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
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"_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
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"_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
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"_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
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"_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
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"_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
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"_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
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"_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
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"_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
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"_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
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"_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
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"_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
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static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
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static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
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static inline unsigned short netdev_lock_pos(unsigned short dev_type)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
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if (netdev_lock_type[i] == dev_type)
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return i;
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/* the last key is used by default */
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return ARRAY_SIZE(netdev_lock_type) - 1;
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}
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static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
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unsigned short dev_type)
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{
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int i;
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i = netdev_lock_pos(dev_type);
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lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
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netdev_lock_name[i]);
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}
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static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
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{
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int i;
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i = netdev_lock_pos(dev->type);
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lockdep_set_class_and_name(&dev->addr_list_lock,
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&netdev_addr_lock_key[i],
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netdev_lock_name[i]);
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}
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#else
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static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
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unsigned short dev_type)
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{
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}
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static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
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{
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}
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#endif
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/*******************************************************************************
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Protocol management and registration routines
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*******************************************************************************/
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/*
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* Add a protocol ID to the list. Now that the input handler is
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* smarter we can dispense with all the messy stuff that used to be
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* here.
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*
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* BEWARE!!! Protocol handlers, mangling input packets,
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* MUST BE last in hash buckets and checking protocol handlers
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* MUST start from promiscuous ptype_all chain in net_bh.
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* It is true now, do not change it.
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* Explanation follows: if protocol handler, mangling packet, will
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* be the first on list, it is not able to sense, that packet
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* is cloned and should be copied-on-write, so that it will
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* change it and subsequent readers will get broken packet.
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* --ANK (980803)
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*/
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static inline struct list_head *ptype_head(const struct packet_type *pt)
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{
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if (pt->type == htons(ETH_P_ALL))
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return &ptype_all;
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else
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return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
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}
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|
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/**
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* dev_add_pack - add packet handler
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* @pt: packet type declaration
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*
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* Add a protocol handler to the networking stack. The passed &packet_type
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* is linked into kernel lists and may not be freed until it has been
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* removed from the kernel lists.
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*
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* This call does not sleep therefore it can not
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* guarantee all CPU's that are in middle of receiving packets
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* will see the new packet type (until the next received packet).
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*/
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void dev_add_pack(struct packet_type *pt)
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{
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struct list_head *head = ptype_head(pt);
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spin_lock(&ptype_lock);
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list_add_rcu(&pt->list, head);
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spin_unlock(&ptype_lock);
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}
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EXPORT_SYMBOL(dev_add_pack);
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|
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/**
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* __dev_remove_pack - remove packet handler
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* @pt: packet type declaration
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*
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* Remove a protocol handler that was previously added to the kernel
|
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* protocol handlers by dev_add_pack(). The passed &packet_type is removed
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* from the kernel lists and can be freed or reused once this function
|
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* returns.
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*
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* The packet type might still be in use by receivers
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* and must not be freed until after all the CPU's have gone
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* through a quiescent state.
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*/
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void __dev_remove_pack(struct packet_type *pt)
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{
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struct list_head *head = ptype_head(pt);
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struct packet_type *pt1;
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spin_lock(&ptype_lock);
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list_for_each_entry(pt1, head, list) {
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if (pt == pt1) {
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list_del_rcu(&pt->list);
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goto out;
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}
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}
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pr_warn("dev_remove_pack: %p not found\n", pt);
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out:
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spin_unlock(&ptype_lock);
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}
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EXPORT_SYMBOL(__dev_remove_pack);
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|
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/**
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* dev_remove_pack - remove packet handler
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* @pt: packet type declaration
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*
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* Remove a protocol handler that was previously added to the kernel
|
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* protocol handlers by dev_add_pack(). The passed &packet_type is removed
|
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* from the kernel lists and can be freed or reused once this function
|
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* returns.
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*
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* This call sleeps to guarantee that no CPU is looking at the packet
|
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* type after return.
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*/
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void dev_remove_pack(struct packet_type *pt)
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{
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__dev_remove_pack(pt);
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|
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synchronize_net();
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}
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EXPORT_SYMBOL(dev_remove_pack);
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|
|
|
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/**
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* dev_add_offload - register offload handlers
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* @po: protocol offload declaration
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*
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* Add protocol offload handlers to the networking stack. The passed
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* &proto_offload is linked into kernel lists and may not be freed until
|
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* it has been removed from the kernel lists.
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*
|
|
* This call does not sleep therefore it can not
|
|
* guarantee all CPU's that are in middle of receiving packets
|
|
* will see the new offload handlers (until the next received packet).
|
|
*/
|
|
void dev_add_offload(struct packet_offload *po)
|
|
{
|
|
struct list_head *head = &offload_base;
|
|
|
|
spin_lock(&offload_lock);
|
|
list_add_rcu(&po->list, head);
|
|
spin_unlock(&offload_lock);
|
|
}
|
|
EXPORT_SYMBOL(dev_add_offload);
|
|
|
|
/**
|
|
* __dev_remove_offload - remove offload handler
|
|
* @po: packet offload declaration
|
|
*
|
|
* Remove a protocol offload handler that was previously added to the
|
|
* kernel offload handlers by dev_add_offload(). The passed &offload_type
|
|
* is removed from the kernel lists and can be freed or reused once this
|
|
* function returns.
|
|
*
|
|
* The packet type might still be in use by receivers
|
|
* and must not be freed until after all the CPU's have gone
|
|
* through a quiescent state.
|
|
*/
|
|
static void __dev_remove_offload(struct packet_offload *po)
|
|
{
|
|
struct list_head *head = &offload_base;
|
|
struct packet_offload *po1;
|
|
|
|
spin_lock(&offload_lock);
|
|
|
|
list_for_each_entry(po1, head, list) {
|
|
if (po == po1) {
|
|
list_del_rcu(&po->list);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
pr_warn("dev_remove_offload: %p not found\n", po);
|
|
out:
|
|
spin_unlock(&offload_lock);
|
|
}
|
|
|
|
/**
|
|
* dev_remove_offload - remove packet offload handler
|
|
* @po: packet offload declaration
|
|
*
|
|
* Remove a packet offload handler that was previously added to the kernel
|
|
* offload handlers by dev_add_offload(). The passed &offload_type is
|
|
* removed from the kernel lists and can be freed or reused once this
|
|
* function returns.
|
|
*
|
|
* This call sleeps to guarantee that no CPU is looking at the packet
|
|
* type after return.
|
|
*/
|
|
void dev_remove_offload(struct packet_offload *po)
|
|
{
|
|
__dev_remove_offload(po);
|
|
|
|
synchronize_net();
|
|
}
|
|
EXPORT_SYMBOL(dev_remove_offload);
|
|
|
|
/******************************************************************************
|
|
|
|
Device Boot-time Settings Routines
|
|
|
|
*******************************************************************************/
|
|
|
|
/* Boot time configuration table */
|
|
static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
|
|
|
|
/**
|
|
* netdev_boot_setup_add - add new setup entry
|
|
* @name: name of the device
|
|
* @map: configured settings for the device
|
|
*
|
|
* Adds new setup entry to the dev_boot_setup list. The function
|
|
* returns 0 on error and 1 on success. This is a generic routine to
|
|
* all netdevices.
|
|
*/
|
|
static int netdev_boot_setup_add(char *name, struct ifmap *map)
|
|
{
|
|
struct netdev_boot_setup *s;
|
|
int i;
|
|
|
|
s = dev_boot_setup;
|
|
for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
|
|
if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
|
|
memset(s[i].name, 0, sizeof(s[i].name));
|
|
strlcpy(s[i].name, name, IFNAMSIZ);
|
|
memcpy(&s[i].map, map, sizeof(s[i].map));
|
|
break;
|
|
}
|
|
}
|
|
|
|
return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
|
|
}
|
|
|
|
/**
|
|
* netdev_boot_setup_check - check boot time settings
|
|
* @dev: the netdevice
|
|
*
|
|
* Check boot time settings for the device.
|
|
* The found settings are set for the device to be used
|
|
* later in the device probing.
|
|
* Returns 0 if no settings found, 1 if they are.
|
|
*/
|
|
int netdev_boot_setup_check(struct net_device *dev)
|
|
{
|
|
struct netdev_boot_setup *s = dev_boot_setup;
|
|
int i;
|
|
|
|
for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
|
|
if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
|
|
!strcmp(dev->name, s[i].name)) {
|
|
dev->irq = s[i].map.irq;
|
|
dev->base_addr = s[i].map.base_addr;
|
|
dev->mem_start = s[i].map.mem_start;
|
|
dev->mem_end = s[i].map.mem_end;
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(netdev_boot_setup_check);
|
|
|
|
|
|
/**
|
|
* netdev_boot_base - get address from boot time settings
|
|
* @prefix: prefix for network device
|
|
* @unit: id for network device
|
|
*
|
|
* Check boot time settings for the base address of device.
|
|
* The found settings are set for the device to be used
|
|
* later in the device probing.
|
|
* Returns 0 if no settings found.
|
|
*/
|
|
unsigned long netdev_boot_base(const char *prefix, int unit)
|
|
{
|
|
const struct netdev_boot_setup *s = dev_boot_setup;
|
|
char name[IFNAMSIZ];
|
|
int i;
|
|
|
|
sprintf(name, "%s%d", prefix, unit);
|
|
|
|
/*
|
|
* If device already registered then return base of 1
|
|
* to indicate not to probe for this interface
|
|
*/
|
|
if (__dev_get_by_name(&init_net, name))
|
|
return 1;
|
|
|
|
for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
|
|
if (!strcmp(name, s[i].name))
|
|
return s[i].map.base_addr;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Saves at boot time configured settings for any netdevice.
|
|
*/
|
|
int __init netdev_boot_setup(char *str)
|
|
{
|
|
int ints[5];
|
|
struct ifmap map;
|
|
|
|
str = get_options(str, ARRAY_SIZE(ints), ints);
|
|
if (!str || !*str)
|
|
return 0;
|
|
|
|
/* Save settings */
|
|
memset(&map, 0, sizeof(map));
|
|
if (ints[0] > 0)
|
|
map.irq = ints[1];
|
|
if (ints[0] > 1)
|
|
map.base_addr = ints[2];
|
|
if (ints[0] > 2)
|
|
map.mem_start = ints[3];
|
|
if (ints[0] > 3)
|
|
map.mem_end = ints[4];
|
|
|
|
/* Add new entry to the list */
|
|
return netdev_boot_setup_add(str, &map);
|
|
}
|
|
|
|
__setup("netdev=", netdev_boot_setup);
|
|
|
|
/*******************************************************************************
|
|
|
|
Device Interface Subroutines
|
|
|
|
*******************************************************************************/
|
|
|
|
/**
|
|
* __dev_get_by_name - find a device by its name
|
|
* @net: the applicable net namespace
|
|
* @name: name to find
|
|
*
|
|
* Find an interface by name. Must be called under RTNL semaphore
|
|
* or @dev_base_lock. If the name is found a pointer to the device
|
|
* is returned. If the name is not found then %NULL is returned. The
|
|
* reference counters are not incremented so the caller must be
|
|
* careful with locks.
|
|
*/
|
|
|
|
struct net_device *__dev_get_by_name(struct net *net, const char *name)
|
|
{
|
|
struct net_device *dev;
|
|
struct hlist_head *head = dev_name_hash(net, name);
|
|
|
|
hlist_for_each_entry(dev, head, name_hlist)
|
|
if (!strncmp(dev->name, name, IFNAMSIZ))
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(__dev_get_by_name);
|
|
|
|
/**
|
|
* dev_get_by_name_rcu - find a device by its name
|
|
* @net: the applicable net namespace
|
|
* @name: name to find
|
|
*
|
|
* Find an interface by name.
|
|
* If the name is found a pointer to the device is returned.
|
|
* If the name is not found then %NULL is returned.
|
|
* The reference counters are not incremented so the caller must be
|
|
* careful with locks. The caller must hold RCU lock.
|
|
*/
|
|
|
|
struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
|
|
{
|
|
struct net_device *dev;
|
|
struct hlist_head *head = dev_name_hash(net, name);
|
|
|
|
hlist_for_each_entry_rcu(dev, head, name_hlist)
|
|
if (!strncmp(dev->name, name, IFNAMSIZ))
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_by_name_rcu);
|
|
|
|
/**
|
|
* dev_get_by_name - find a device by its name
|
|
* @net: the applicable net namespace
|
|
* @name: name to find
|
|
*
|
|
* Find an interface by name. This can be called from any
|
|
* context and does its own locking. The returned handle has
|
|
* the usage count incremented and the caller must use dev_put() to
|
|
* release it when it is no longer needed. %NULL is returned if no
|
|
* matching device is found.
|
|
*/
|
|
|
|
struct net_device *dev_get_by_name(struct net *net, const char *name)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
rcu_read_lock();
|
|
dev = dev_get_by_name_rcu(net, name);
|
|
if (dev)
|
|
dev_hold(dev);
|
|
rcu_read_unlock();
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_by_name);
|
|
|
|
/**
|
|
* __dev_get_by_index - find a device by its ifindex
|
|
* @net: the applicable net namespace
|
|
* @ifindex: index of device
|
|
*
|
|
* Search for an interface by index. Returns %NULL if the device
|
|
* is not found or a pointer to the device. The device has not
|
|
* had its reference counter increased so the caller must be careful
|
|
* about locking. The caller must hold either the RTNL semaphore
|
|
* or @dev_base_lock.
|
|
*/
|
|
|
|
struct net_device *__dev_get_by_index(struct net *net, int ifindex)
|
|
{
|
|
struct net_device *dev;
|
|
struct hlist_head *head = dev_index_hash(net, ifindex);
|
|
|
|
hlist_for_each_entry(dev, head, index_hlist)
|
|
if (dev->ifindex == ifindex)
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(__dev_get_by_index);
|
|
|
|
/**
|
|
* dev_get_by_index_rcu - find a device by its ifindex
|
|
* @net: the applicable net namespace
|
|
* @ifindex: index of device
|
|
*
|
|
* Search for an interface by index. Returns %NULL if the device
|
|
* is not found or a pointer to the device. The device has not
|
|
* had its reference counter increased so the caller must be careful
|
|
* about locking. The caller must hold RCU lock.
|
|
*/
|
|
|
|
struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
|
|
{
|
|
struct net_device *dev;
|
|
struct hlist_head *head = dev_index_hash(net, ifindex);
|
|
|
|
hlist_for_each_entry_rcu(dev, head, index_hlist)
|
|
if (dev->ifindex == ifindex)
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_by_index_rcu);
|
|
|
|
|
|
/**
|
|
* dev_get_by_index - find a device by its ifindex
|
|
* @net: the applicable net namespace
|
|
* @ifindex: index of device
|
|
*
|
|
* Search for an interface by index. Returns NULL if the device
|
|
* is not found or a pointer to the device. The device returned has
|
|
* had a reference added and the pointer is safe until the user calls
|
|
* dev_put to indicate they have finished with it.
|
|
*/
|
|
|
|
struct net_device *dev_get_by_index(struct net *net, int ifindex)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(net, ifindex);
|
|
if (dev)
|
|
dev_hold(dev);
|
|
rcu_read_unlock();
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_by_index);
|
|
|
|
/**
|
|
* netdev_get_name - get a netdevice name, knowing its ifindex.
|
|
* @net: network namespace
|
|
* @name: a pointer to the buffer where the name will be stored.
|
|
* @ifindex: the ifindex of the interface to get the name from.
|
|
*
|
|
* The use of raw_seqcount_begin() and cond_resched() before
|
|
* retrying is required as we want to give the writers a chance
|
|
* to complete when CONFIG_PREEMPT is not set.
|
|
*/
|
|
int netdev_get_name(struct net *net, char *name, int ifindex)
|
|
{
|
|
struct net_device *dev;
|
|
unsigned int seq;
|
|
|
|
retry:
|
|
seq = raw_seqcount_begin(&devnet_rename_seq);
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(net, ifindex);
|
|
if (!dev) {
|
|
rcu_read_unlock();
|
|
return -ENODEV;
|
|
}
|
|
|
|
strcpy(name, dev->name);
|
|
rcu_read_unlock();
|
|
if (read_seqcount_retry(&devnet_rename_seq, seq)) {
|
|
cond_resched();
|
|
goto retry;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dev_getbyhwaddr_rcu - find a device by its hardware address
|
|
* @net: the applicable net namespace
|
|
* @type: media type of device
|
|
* @ha: hardware address
|
|
*
|
|
* Search for an interface by MAC address. Returns NULL if the device
|
|
* is not found or a pointer to the device.
|
|
* The caller must hold RCU or RTNL.
|
|
* The returned device has not had its ref count increased
|
|
* and the caller must therefore be careful about locking
|
|
*
|
|
*/
|
|
|
|
struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
|
|
const char *ha)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
for_each_netdev_rcu(net, dev)
|
|
if (dev->type == type &&
|
|
!memcmp(dev->dev_addr, ha, dev->addr_len))
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
|
|
|
|
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
ASSERT_RTNL();
|
|
for_each_netdev(net, dev)
|
|
if (dev->type == type)
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(__dev_getfirstbyhwtype);
|
|
|
|
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
|
|
{
|
|
struct net_device *dev, *ret = NULL;
|
|
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(net, dev)
|
|
if (dev->type == type) {
|
|
dev_hold(dev);
|
|
ret = dev;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dev_getfirstbyhwtype);
|
|
|
|
/**
|
|
* dev_get_by_flags_rcu - find any device with given flags
|
|
* @net: the applicable net namespace
|
|
* @if_flags: IFF_* values
|
|
* @mask: bitmask of bits in if_flags to check
|
|
*
|
|
* Search for any interface with the given flags. Returns NULL if a device
|
|
* is not found or a pointer to the device. Must be called inside
|
|
* rcu_read_lock(), and result refcount is unchanged.
|
|
*/
|
|
|
|
struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
|
|
unsigned short mask)
|
|
{
|
|
struct net_device *dev, *ret;
|
|
|
|
ret = NULL;
|
|
for_each_netdev_rcu(net, dev) {
|
|
if (((dev->flags ^ if_flags) & mask) == 0) {
|
|
ret = dev;
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_by_flags_rcu);
|
|
|
|
/**
|
|
* dev_valid_name - check if name is okay for network device
|
|
* @name: name string
|
|
*
|
|
* Network device names need to be valid file names to
|
|
* to allow sysfs to work. We also disallow any kind of
|
|
* whitespace.
|
|
*/
|
|
bool dev_valid_name(const char *name)
|
|
{
|
|
if (*name == '\0')
|
|
return false;
|
|
if (strlen(name) >= IFNAMSIZ)
|
|
return false;
|
|
if (!strcmp(name, ".") || !strcmp(name, ".."))
|
|
return false;
|
|
|
|
while (*name) {
|
|
if (*name == '/' || isspace(*name))
|
|
return false;
|
|
name++;
|
|
}
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(dev_valid_name);
|
|
|
|
/**
|
|
* __dev_alloc_name - allocate a name for a device
|
|
* @net: network namespace to allocate the device name in
|
|
* @name: name format string
|
|
* @buf: scratch buffer and result name string
|
|
*
|
|
* Passed a format string - eg "lt%d" it will try and find a suitable
|
|
* id. It scans list of devices to build up a free map, then chooses
|
|
* the first empty slot. The caller must hold the dev_base or rtnl lock
|
|
* while allocating the name and adding the device in order to avoid
|
|
* duplicates.
|
|
* Limited to bits_per_byte * page size devices (ie 32K on most platforms).
|
|
* Returns the number of the unit assigned or a negative errno code.
|
|
*/
|
|
|
|
static int __dev_alloc_name(struct net *net, const char *name, char *buf)
|
|
{
|
|
int i = 0;
|
|
const char *p;
|
|
const int max_netdevices = 8*PAGE_SIZE;
|
|
unsigned long *inuse;
|
|
struct net_device *d;
|
|
|
|
p = strnchr(name, IFNAMSIZ-1, '%');
|
|
if (p) {
|
|
/*
|
|
* Verify the string as this thing may have come from
|
|
* the user. There must be either one "%d" and no other "%"
|
|
* characters.
|
|
*/
|
|
if (p[1] != 'd' || strchr(p + 2, '%'))
|
|
return -EINVAL;
|
|
|
|
/* Use one page as a bit array of possible slots */
|
|
inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
|
|
if (!inuse)
|
|
return -ENOMEM;
|
|
|
|
for_each_netdev(net, d) {
|
|
if (!sscanf(d->name, name, &i))
|
|
continue;
|
|
if (i < 0 || i >= max_netdevices)
|
|
continue;
|
|
|
|
/* avoid cases where sscanf is not exact inverse of printf */
|
|
snprintf(buf, IFNAMSIZ, name, i);
|
|
if (!strncmp(buf, d->name, IFNAMSIZ))
|
|
set_bit(i, inuse);
|
|
}
|
|
|
|
i = find_first_zero_bit(inuse, max_netdevices);
|
|
free_page((unsigned long) inuse);
|
|
}
|
|
|
|
if (buf != name)
|
|
snprintf(buf, IFNAMSIZ, name, i);
|
|
if (!__dev_get_by_name(net, buf))
|
|
return i;
|
|
|
|
/* It is possible to run out of possible slots
|
|
* when the name is long and there isn't enough space left
|
|
* for the digits, or if all bits are used.
|
|
*/
|
|
return -ENFILE;
|
|
}
|
|
|
|
/**
|
|
* dev_alloc_name - allocate a name for a device
|
|
* @dev: device
|
|
* @name: name format string
|
|
*
|
|
* Passed a format string - eg "lt%d" it will try and find a suitable
|
|
* id. It scans list of devices to build up a free map, then chooses
|
|
* the first empty slot. The caller must hold the dev_base or rtnl lock
|
|
* while allocating the name and adding the device in order to avoid
|
|
* duplicates.
|
|
* Limited to bits_per_byte * page size devices (ie 32K on most platforms).
|
|
* Returns the number of the unit assigned or a negative errno code.
|
|
*/
|
|
|
|
int dev_alloc_name(struct net_device *dev, const char *name)
|
|
{
|
|
char buf[IFNAMSIZ];
|
|
struct net *net;
|
|
int ret;
|
|
|
|
BUG_ON(!dev_net(dev));
|
|
net = dev_net(dev);
|
|
ret = __dev_alloc_name(net, name, buf);
|
|
if (ret >= 0)
|
|
strlcpy(dev->name, buf, IFNAMSIZ);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dev_alloc_name);
|
|
|
|
static int dev_alloc_name_ns(struct net *net,
|
|
struct net_device *dev,
|
|
const char *name)
|
|
{
|
|
char buf[IFNAMSIZ];
|
|
int ret;
|
|
|
|
ret = __dev_alloc_name(net, name, buf);
|
|
if (ret >= 0)
|
|
strlcpy(dev->name, buf, IFNAMSIZ);
|
|
return ret;
|
|
}
|
|
|
|
static int dev_get_valid_name(struct net *net,
|
|
struct net_device *dev,
|
|
const char *name)
|
|
{
|
|
BUG_ON(!net);
|
|
|
|
if (!dev_valid_name(name))
|
|
return -EINVAL;
|
|
|
|
if (strchr(name, '%'))
|
|
return dev_alloc_name_ns(net, dev, name);
|
|
else if (__dev_get_by_name(net, name))
|
|
return -EEXIST;
|
|
else if (dev->name != name)
|
|
strlcpy(dev->name, name, IFNAMSIZ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dev_change_name - change name of a device
|
|
* @dev: device
|
|
* @newname: name (or format string) must be at least IFNAMSIZ
|
|
*
|
|
* Change name of a device, can pass format strings "eth%d".
|
|
* for wildcarding.
|
|
*/
|
|
int dev_change_name(struct net_device *dev, const char *newname)
|
|
{
|
|
char oldname[IFNAMSIZ];
|
|
int err = 0;
|
|
int ret;
|
|
struct net *net;
|
|
|
|
ASSERT_RTNL();
|
|
BUG_ON(!dev_net(dev));
|
|
|
|
net = dev_net(dev);
|
|
if (dev->flags & IFF_UP)
|
|
return -EBUSY;
|
|
|
|
write_seqcount_begin(&devnet_rename_seq);
|
|
|
|
if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
|
|
write_seqcount_end(&devnet_rename_seq);
|
|
return 0;
|
|
}
|
|
|
|
memcpy(oldname, dev->name, IFNAMSIZ);
|
|
|
|
err = dev_get_valid_name(net, dev, newname);
|
|
if (err < 0) {
|
|
write_seqcount_end(&devnet_rename_seq);
|
|
return err;
|
|
}
|
|
|
|
rollback:
|
|
ret = device_rename(&dev->dev, dev->name);
|
|
if (ret) {
|
|
memcpy(dev->name, oldname, IFNAMSIZ);
|
|
write_seqcount_end(&devnet_rename_seq);
|
|
return ret;
|
|
}
|
|
|
|
write_seqcount_end(&devnet_rename_seq);
|
|
|
|
netdev_adjacent_rename_links(dev, oldname);
|
|
|
|
write_lock_bh(&dev_base_lock);
|
|
hlist_del_rcu(&dev->name_hlist);
|
|
write_unlock_bh(&dev_base_lock);
|
|
|
|
synchronize_rcu();
|
|
|
|
write_lock_bh(&dev_base_lock);
|
|
hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
|
|
write_unlock_bh(&dev_base_lock);
|
|
|
|
ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
|
|
ret = notifier_to_errno(ret);
|
|
|
|
if (ret) {
|
|
/* err >= 0 after dev_alloc_name() or stores the first errno */
|
|
if (err >= 0) {
|
|
err = ret;
|
|
write_seqcount_begin(&devnet_rename_seq);
|
|
memcpy(dev->name, oldname, IFNAMSIZ);
|
|
memcpy(oldname, newname, IFNAMSIZ);
|
|
goto rollback;
|
|
} else {
|
|
pr_err("%s: name change rollback failed: %d\n",
|
|
dev->name, ret);
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* dev_set_alias - change ifalias of a device
|
|
* @dev: device
|
|
* @alias: name up to IFALIASZ
|
|
* @len: limit of bytes to copy from info
|
|
*
|
|
* Set ifalias for a device,
|
|
*/
|
|
int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
|
|
{
|
|
char *new_ifalias;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (len >= IFALIASZ)
|
|
return -EINVAL;
|
|
|
|
if (!len) {
|
|
kfree(dev->ifalias);
|
|
dev->ifalias = NULL;
|
|
return 0;
|
|
}
|
|
|
|
new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
|
|
if (!new_ifalias)
|
|
return -ENOMEM;
|
|
dev->ifalias = new_ifalias;
|
|
|
|
strlcpy(dev->ifalias, alias, len+1);
|
|
return len;
|
|
}
|
|
|
|
|
|
/**
|
|
* netdev_features_change - device changes features
|
|
* @dev: device to cause notification
|
|
*
|
|
* Called to indicate a device has changed features.
|
|
*/
|
|
void netdev_features_change(struct net_device *dev)
|
|
{
|
|
call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
|
|
}
|
|
EXPORT_SYMBOL(netdev_features_change);
|
|
|
|
/**
|
|
* netdev_state_change - device changes state
|
|
* @dev: device to cause notification
|
|
*
|
|
* Called to indicate a device has changed state. This function calls
|
|
* the notifier chains for netdev_chain and sends a NEWLINK message
|
|
* to the routing socket.
|
|
*/
|
|
void netdev_state_change(struct net_device *dev)
|
|
{
|
|
if (dev->flags & IFF_UP) {
|
|
call_netdevice_notifiers(NETDEV_CHANGE, dev);
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netdev_state_change);
|
|
|
|
/**
|
|
* netdev_notify_peers - notify network peers about existence of @dev
|
|
* @dev: network device
|
|
*
|
|
* Generate traffic such that interested network peers are aware of
|
|
* @dev, such as by generating a gratuitous ARP. This may be used when
|
|
* a device wants to inform the rest of the network about some sort of
|
|
* reconfiguration such as a failover event or virtual machine
|
|
* migration.
|
|
*/
|
|
void netdev_notify_peers(struct net_device *dev)
|
|
{
|
|
rtnl_lock();
|
|
call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
|
|
rtnl_unlock();
|
|
}
|
|
EXPORT_SYMBOL(netdev_notify_peers);
|
|
|
|
static int __dev_open(struct net_device *dev)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
int ret;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
|
|
/* Block netpoll from trying to do any rx path servicing.
|
|
* If we don't do this there is a chance ndo_poll_controller
|
|
* or ndo_poll may be running while we open the device
|
|
*/
|
|
netpoll_rx_disable(dev);
|
|
|
|
ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
|
|
ret = notifier_to_errno(ret);
|
|
if (ret)
|
|
return ret;
|
|
|
|
set_bit(__LINK_STATE_START, &dev->state);
|
|
|
|
if (ops->ndo_validate_addr)
|
|
ret = ops->ndo_validate_addr(dev);
|
|
|
|
if (!ret && ops->ndo_open)
|
|
ret = ops->ndo_open(dev);
|
|
|
|
netpoll_rx_enable(dev);
|
|
|
|
if (ret)
|
|
clear_bit(__LINK_STATE_START, &dev->state);
|
|
else {
|
|
dev->flags |= IFF_UP;
|
|
net_dmaengine_get();
|
|
dev_set_rx_mode(dev);
|
|
dev_activate(dev);
|
|
add_device_randomness(dev->dev_addr, dev->addr_len);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* dev_open - prepare an interface for use.
|
|
* @dev: device to open
|
|
*
|
|
* Takes a device from down to up state. The device's private open
|
|
* function is invoked and then the multicast lists are loaded. Finally
|
|
* the device is moved into the up state and a %NETDEV_UP message is
|
|
* sent to the netdev notifier chain.
|
|
*
|
|
* Calling this function on an active interface is a nop. On a failure
|
|
* a negative errno code is returned.
|
|
*/
|
|
int dev_open(struct net_device *dev)
|
|
{
|
|
int ret;
|
|
|
|
if (dev->flags & IFF_UP)
|
|
return 0;
|
|
|
|
ret = __dev_open(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
|
|
call_netdevice_notifiers(NETDEV_UP, dev);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dev_open);
|
|
|
|
static int __dev_close_many(struct list_head *head)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
ASSERT_RTNL();
|
|
might_sleep();
|
|
|
|
list_for_each_entry(dev, head, close_list) {
|
|
call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
|
|
|
|
clear_bit(__LINK_STATE_START, &dev->state);
|
|
|
|
/* Synchronize to scheduled poll. We cannot touch poll list, it
|
|
* can be even on different cpu. So just clear netif_running().
|
|
*
|
|
* dev->stop() will invoke napi_disable() on all of it's
|
|
* napi_struct instances on this device.
|
|
*/
|
|
smp_mb__after_clear_bit(); /* Commit netif_running(). */
|
|
}
|
|
|
|
dev_deactivate_many(head);
|
|
|
|
list_for_each_entry(dev, head, close_list) {
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
/*
|
|
* Call the device specific close. This cannot fail.
|
|
* Only if device is UP
|
|
*
|
|
* We allow it to be called even after a DETACH hot-plug
|
|
* event.
|
|
*/
|
|
if (ops->ndo_stop)
|
|
ops->ndo_stop(dev);
|
|
|
|
dev->flags &= ~IFF_UP;
|
|
net_dmaengine_put();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __dev_close(struct net_device *dev)
|
|
{
|
|
int retval;
|
|
LIST_HEAD(single);
|
|
|
|
/* Temporarily disable netpoll until the interface is down */
|
|
netpoll_rx_disable(dev);
|
|
|
|
list_add(&dev->close_list, &single);
|
|
retval = __dev_close_many(&single);
|
|
list_del(&single);
|
|
|
|
netpoll_rx_enable(dev);
|
|
return retval;
|
|
}
|
|
|
|
static int dev_close_many(struct list_head *head)
|
|
{
|
|
struct net_device *dev, *tmp;
|
|
|
|
/* Remove the devices that don't need to be closed */
|
|
list_for_each_entry_safe(dev, tmp, head, close_list)
|
|
if (!(dev->flags & IFF_UP))
|
|
list_del_init(&dev->close_list);
|
|
|
|
__dev_close_many(head);
|
|
|
|
list_for_each_entry_safe(dev, tmp, head, close_list) {
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
|
|
call_netdevice_notifiers(NETDEV_DOWN, dev);
|
|
list_del_init(&dev->close_list);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dev_close - shutdown an interface.
|
|
* @dev: device to shutdown
|
|
*
|
|
* This function moves an active device into down state. A
|
|
* %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
|
|
* is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
|
|
* chain.
|
|
*/
|
|
int dev_close(struct net_device *dev)
|
|
{
|
|
if (dev->flags & IFF_UP) {
|
|
LIST_HEAD(single);
|
|
|
|
/* Block netpoll rx while the interface is going down */
|
|
netpoll_rx_disable(dev);
|
|
|
|
list_add(&dev->close_list, &single);
|
|
dev_close_many(&single);
|
|
list_del(&single);
|
|
|
|
netpoll_rx_enable(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dev_close);
|
|
|
|
|
|
/**
|
|
* dev_disable_lro - disable Large Receive Offload on a device
|
|
* @dev: device
|
|
*
|
|
* Disable Large Receive Offload (LRO) on a net device. Must be
|
|
* called under RTNL. This is needed if received packets may be
|
|
* forwarded to another interface.
|
|
*/
|
|
void dev_disable_lro(struct net_device *dev)
|
|
{
|
|
/*
|
|
* If we're trying to disable lro on a vlan device
|
|
* use the underlying physical device instead
|
|
*/
|
|
if (is_vlan_dev(dev))
|
|
dev = vlan_dev_real_dev(dev);
|
|
|
|
/* the same for macvlan devices */
|
|
if (netif_is_macvlan(dev))
|
|
dev = macvlan_dev_real_dev(dev);
|
|
|
|
dev->wanted_features &= ~NETIF_F_LRO;
|
|
netdev_update_features(dev);
|
|
|
|
if (unlikely(dev->features & NETIF_F_LRO))
|
|
netdev_WARN(dev, "failed to disable LRO!\n");
|
|
}
|
|
EXPORT_SYMBOL(dev_disable_lro);
|
|
|
|
static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
|
|
struct net_device *dev)
|
|
{
|
|
struct netdev_notifier_info info;
|
|
|
|
netdev_notifier_info_init(&info, dev);
|
|
return nb->notifier_call(nb, val, &info);
|
|
}
|
|
|
|
static int dev_boot_phase = 1;
|
|
|
|
/**
|
|
* register_netdevice_notifier - register a network notifier block
|
|
* @nb: notifier
|
|
*
|
|
* Register a notifier to be called when network device events occur.
|
|
* The notifier passed is linked into the kernel structures and must
|
|
* not be reused until it has been unregistered. A negative errno code
|
|
* is returned on a failure.
|
|
*
|
|
* When registered all registration and up events are replayed
|
|
* to the new notifier to allow device to have a race free
|
|
* view of the network device list.
|
|
*/
|
|
|
|
int register_netdevice_notifier(struct notifier_block *nb)
|
|
{
|
|
struct net_device *dev;
|
|
struct net_device *last;
|
|
struct net *net;
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = raw_notifier_chain_register(&netdev_chain, nb);
|
|
if (err)
|
|
goto unlock;
|
|
if (dev_boot_phase)
|
|
goto unlock;
|
|
for_each_net(net) {
|
|
for_each_netdev(net, dev) {
|
|
err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
|
|
err = notifier_to_errno(err);
|
|
if (err)
|
|
goto rollback;
|
|
|
|
if (!(dev->flags & IFF_UP))
|
|
continue;
|
|
|
|
call_netdevice_notifier(nb, NETDEV_UP, dev);
|
|
}
|
|
}
|
|
|
|
unlock:
|
|
rtnl_unlock();
|
|
return err;
|
|
|
|
rollback:
|
|
last = dev;
|
|
for_each_net(net) {
|
|
for_each_netdev(net, dev) {
|
|
if (dev == last)
|
|
goto outroll;
|
|
|
|
if (dev->flags & IFF_UP) {
|
|
call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
|
|
dev);
|
|
call_netdevice_notifier(nb, NETDEV_DOWN, dev);
|
|
}
|
|
call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
|
|
}
|
|
}
|
|
|
|
outroll:
|
|
raw_notifier_chain_unregister(&netdev_chain, nb);
|
|
goto unlock;
|
|
}
|
|
EXPORT_SYMBOL(register_netdevice_notifier);
|
|
|
|
/**
|
|
* unregister_netdevice_notifier - unregister a network notifier block
|
|
* @nb: notifier
|
|
*
|
|
* Unregister a notifier previously registered by
|
|
* register_netdevice_notifier(). The notifier is unlinked into the
|
|
* kernel structures and may then be reused. A negative errno code
|
|
* is returned on a failure.
|
|
*
|
|
* After unregistering unregister and down device events are synthesized
|
|
* for all devices on the device list to the removed notifier to remove
|
|
* the need for special case cleanup code.
|
|
*/
|
|
|
|
int unregister_netdevice_notifier(struct notifier_block *nb)
|
|
{
|
|
struct net_device *dev;
|
|
struct net *net;
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = raw_notifier_chain_unregister(&netdev_chain, nb);
|
|
if (err)
|
|
goto unlock;
|
|
|
|
for_each_net(net) {
|
|
for_each_netdev(net, dev) {
|
|
if (dev->flags & IFF_UP) {
|
|
call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
|
|
dev);
|
|
call_netdevice_notifier(nb, NETDEV_DOWN, dev);
|
|
}
|
|
call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
|
|
}
|
|
}
|
|
unlock:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(unregister_netdevice_notifier);
|
|
|
|
/**
|
|
* call_netdevice_notifiers_info - call all network notifier blocks
|
|
* @val: value passed unmodified to notifier function
|
|
* @dev: net_device pointer passed unmodified to notifier function
|
|
* @info: notifier information data
|
|
*
|
|
* Call all network notifier blocks. Parameters and return value
|
|
* are as for raw_notifier_call_chain().
|
|
*/
|
|
|
|
static int call_netdevice_notifiers_info(unsigned long val,
|
|
struct net_device *dev,
|
|
struct netdev_notifier_info *info)
|
|
{
|
|
ASSERT_RTNL();
|
|
netdev_notifier_info_init(info, dev);
|
|
return raw_notifier_call_chain(&netdev_chain, val, info);
|
|
}
|
|
|
|
/**
|
|
* call_netdevice_notifiers - call all network notifier blocks
|
|
* @val: value passed unmodified to notifier function
|
|
* @dev: net_device pointer passed unmodified to notifier function
|
|
*
|
|
* Call all network notifier blocks. Parameters and return value
|
|
* are as for raw_notifier_call_chain().
|
|
*/
|
|
|
|
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
|
|
{
|
|
struct netdev_notifier_info info;
|
|
|
|
return call_netdevice_notifiers_info(val, dev, &info);
|
|
}
|
|
EXPORT_SYMBOL(call_netdevice_notifiers);
|
|
|
|
static struct static_key netstamp_needed __read_mostly;
|
|
#ifdef HAVE_JUMP_LABEL
|
|
/* We are not allowed to call static_key_slow_dec() from irq context
|
|
* If net_disable_timestamp() is called from irq context, defer the
|
|
* static_key_slow_dec() calls.
|
|
*/
|
|
static atomic_t netstamp_needed_deferred;
|
|
#endif
|
|
|
|
void net_enable_timestamp(void)
|
|
{
|
|
#ifdef HAVE_JUMP_LABEL
|
|
int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
|
|
|
|
if (deferred) {
|
|
while (--deferred)
|
|
static_key_slow_dec(&netstamp_needed);
|
|
return;
|
|
}
|
|
#endif
|
|
static_key_slow_inc(&netstamp_needed);
|
|
}
|
|
EXPORT_SYMBOL(net_enable_timestamp);
|
|
|
|
void net_disable_timestamp(void)
|
|
{
|
|
#ifdef HAVE_JUMP_LABEL
|
|
if (in_interrupt()) {
|
|
atomic_inc(&netstamp_needed_deferred);
|
|
return;
|
|
}
|
|
#endif
|
|
static_key_slow_dec(&netstamp_needed);
|
|
}
|
|
EXPORT_SYMBOL(net_disable_timestamp);
|
|
|
|
static inline void net_timestamp_set(struct sk_buff *skb)
|
|
{
|
|
skb->tstamp.tv64 = 0;
|
|
if (static_key_false(&netstamp_needed))
|
|
__net_timestamp(skb);
|
|
}
|
|
|
|
#define net_timestamp_check(COND, SKB) \
|
|
if (static_key_false(&netstamp_needed)) { \
|
|
if ((COND) && !(SKB)->tstamp.tv64) \
|
|
__net_timestamp(SKB); \
|
|
} \
|
|
|
|
static inline bool is_skb_forwardable(struct net_device *dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
unsigned int len;
|
|
|
|
if (!(dev->flags & IFF_UP))
|
|
return false;
|
|
|
|
len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
|
|
if (skb->len <= len)
|
|
return true;
|
|
|
|
/* if TSO is enabled, we don't care about the length as the packet
|
|
* could be forwarded without being segmented before
|
|
*/
|
|
if (skb_is_gso(skb))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* dev_forward_skb - loopback an skb to another netif
|
|
*
|
|
* @dev: destination network device
|
|
* @skb: buffer to forward
|
|
*
|
|
* return values:
|
|
* NET_RX_SUCCESS (no congestion)
|
|
* NET_RX_DROP (packet was dropped, but freed)
|
|
*
|
|
* dev_forward_skb can be used for injecting an skb from the
|
|
* start_xmit function of one device into the receive queue
|
|
* of another device.
|
|
*
|
|
* The receiving device may be in another namespace, so
|
|
* we have to clear all information in the skb that could
|
|
* impact namespace isolation.
|
|
*/
|
|
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
|
|
if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
|
|
atomic_long_inc(&dev->rx_dropped);
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
}
|
|
|
|
if (unlikely(!is_skb_forwardable(dev, skb))) {
|
|
atomic_long_inc(&dev->rx_dropped);
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
skb_scrub_packet(skb, true);
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
|
|
return netif_rx_internal(skb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_forward_skb);
|
|
|
|
static inline int deliver_skb(struct sk_buff *skb,
|
|
struct packet_type *pt_prev,
|
|
struct net_device *orig_dev)
|
|
{
|
|
if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
|
|
return -ENOMEM;
|
|
atomic_inc(&skb->users);
|
|
return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
|
|
}
|
|
|
|
static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
|
|
{
|
|
if (!ptype->af_packet_priv || !skb->sk)
|
|
return false;
|
|
|
|
if (ptype->id_match)
|
|
return ptype->id_match(ptype, skb->sk);
|
|
else if ((struct sock *)ptype->af_packet_priv == skb->sk)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Support routine. Sends outgoing frames to any network
|
|
* taps currently in use.
|
|
*/
|
|
|
|
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct packet_type *ptype;
|
|
struct sk_buff *skb2 = NULL;
|
|
struct packet_type *pt_prev = NULL;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ptype, &ptype_all, list) {
|
|
/* Never send packets back to the socket
|
|
* they originated from - MvS (miquels@drinkel.ow.org)
|
|
*/
|
|
if ((ptype->dev == dev || !ptype->dev) &&
|
|
(!skb_loop_sk(ptype, skb))) {
|
|
if (pt_prev) {
|
|
deliver_skb(skb2, pt_prev, skb->dev);
|
|
pt_prev = ptype;
|
|
continue;
|
|
}
|
|
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb2)
|
|
break;
|
|
|
|
net_timestamp_set(skb2);
|
|
|
|
/* skb->nh should be correctly
|
|
set by sender, so that the second statement is
|
|
just protection against buggy protocols.
|
|
*/
|
|
skb_reset_mac_header(skb2);
|
|
|
|
if (skb_network_header(skb2) < skb2->data ||
|
|
skb_network_header(skb2) > skb_tail_pointer(skb2)) {
|
|
net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
|
|
ntohs(skb2->protocol),
|
|
dev->name);
|
|
skb_reset_network_header(skb2);
|
|
}
|
|
|
|
skb2->transport_header = skb2->network_header;
|
|
skb2->pkt_type = PACKET_OUTGOING;
|
|
pt_prev = ptype;
|
|
}
|
|
}
|
|
if (pt_prev)
|
|
pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
|
|
* @dev: Network device
|
|
* @txq: number of queues available
|
|
*
|
|
* If real_num_tx_queues is changed the tc mappings may no longer be
|
|
* valid. To resolve this verify the tc mapping remains valid and if
|
|
* not NULL the mapping. With no priorities mapping to this
|
|
* offset/count pair it will no longer be used. In the worst case TC0
|
|
* is invalid nothing can be done so disable priority mappings. If is
|
|
* expected that drivers will fix this mapping if they can before
|
|
* calling netif_set_real_num_tx_queues.
|
|
*/
|
|
static void netif_setup_tc(struct net_device *dev, unsigned int txq)
|
|
{
|
|
int i;
|
|
struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
|
|
|
|
/* If TC0 is invalidated disable TC mapping */
|
|
if (tc->offset + tc->count > txq) {
|
|
pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
|
|
dev->num_tc = 0;
|
|
return;
|
|
}
|
|
|
|
/* Invalidated prio to tc mappings set to TC0 */
|
|
for (i = 1; i < TC_BITMASK + 1; i++) {
|
|
int q = netdev_get_prio_tc_map(dev, i);
|
|
|
|
tc = &dev->tc_to_txq[q];
|
|
if (tc->offset + tc->count > txq) {
|
|
pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
|
|
i, q);
|
|
netdev_set_prio_tc_map(dev, i, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_XPS
|
|
static DEFINE_MUTEX(xps_map_mutex);
|
|
#define xmap_dereference(P) \
|
|
rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
|
|
|
|
static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps,
|
|
int cpu, u16 index)
|
|
{
|
|
struct xps_map *map = NULL;
|
|
int pos;
|
|
|
|
if (dev_maps)
|
|
map = xmap_dereference(dev_maps->cpu_map[cpu]);
|
|
|
|
for (pos = 0; map && pos < map->len; pos++) {
|
|
if (map->queues[pos] == index) {
|
|
if (map->len > 1) {
|
|
map->queues[pos] = map->queues[--map->len];
|
|
} else {
|
|
RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL);
|
|
kfree_rcu(map, rcu);
|
|
map = NULL;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return map;
|
|
}
|
|
|
|
static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
|
|
{
|
|
struct xps_dev_maps *dev_maps;
|
|
int cpu, i;
|
|
bool active = false;
|
|
|
|
mutex_lock(&xps_map_mutex);
|
|
dev_maps = xmap_dereference(dev->xps_maps);
|
|
|
|
if (!dev_maps)
|
|
goto out_no_maps;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
for (i = index; i < dev->num_tx_queues; i++) {
|
|
if (!remove_xps_queue(dev_maps, cpu, i))
|
|
break;
|
|
}
|
|
if (i == dev->num_tx_queues)
|
|
active = true;
|
|
}
|
|
|
|
if (!active) {
|
|
RCU_INIT_POINTER(dev->xps_maps, NULL);
|
|
kfree_rcu(dev_maps, rcu);
|
|
}
|
|
|
|
for (i = index; i < dev->num_tx_queues; i++)
|
|
netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i),
|
|
NUMA_NO_NODE);
|
|
|
|
out_no_maps:
|
|
mutex_unlock(&xps_map_mutex);
|
|
}
|
|
|
|
static struct xps_map *expand_xps_map(struct xps_map *map,
|
|
int cpu, u16 index)
|
|
{
|
|
struct xps_map *new_map;
|
|
int alloc_len = XPS_MIN_MAP_ALLOC;
|
|
int i, pos;
|
|
|
|
for (pos = 0; map && pos < map->len; pos++) {
|
|
if (map->queues[pos] != index)
|
|
continue;
|
|
return map;
|
|
}
|
|
|
|
/* Need to add queue to this CPU's existing map */
|
|
if (map) {
|
|
if (pos < map->alloc_len)
|
|
return map;
|
|
|
|
alloc_len = map->alloc_len * 2;
|
|
}
|
|
|
|
/* Need to allocate new map to store queue on this CPU's map */
|
|
new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
|
|
cpu_to_node(cpu));
|
|
if (!new_map)
|
|
return NULL;
|
|
|
|
for (i = 0; i < pos; i++)
|
|
new_map->queues[i] = map->queues[i];
|
|
new_map->alloc_len = alloc_len;
|
|
new_map->len = pos;
|
|
|
|
return new_map;
|
|
}
|
|
|
|
int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
|
|
u16 index)
|
|
{
|
|
struct xps_dev_maps *dev_maps, *new_dev_maps = NULL;
|
|
struct xps_map *map, *new_map;
|
|
int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES);
|
|
int cpu, numa_node_id = -2;
|
|
bool active = false;
|
|
|
|
mutex_lock(&xps_map_mutex);
|
|
|
|
dev_maps = xmap_dereference(dev->xps_maps);
|
|
|
|
/* allocate memory for queue storage */
|
|
for_each_online_cpu(cpu) {
|
|
if (!cpumask_test_cpu(cpu, mask))
|
|
continue;
|
|
|
|
if (!new_dev_maps)
|
|
new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
|
|
if (!new_dev_maps) {
|
|
mutex_unlock(&xps_map_mutex);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
|
|
NULL;
|
|
|
|
map = expand_xps_map(map, cpu, index);
|
|
if (!map)
|
|
goto error;
|
|
|
|
RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
|
|
}
|
|
|
|
if (!new_dev_maps)
|
|
goto out_no_new_maps;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) {
|
|
/* add queue to CPU maps */
|
|
int pos = 0;
|
|
|
|
map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
|
|
while ((pos < map->len) && (map->queues[pos] != index))
|
|
pos++;
|
|
|
|
if (pos == map->len)
|
|
map->queues[map->len++] = index;
|
|
#ifdef CONFIG_NUMA
|
|
if (numa_node_id == -2)
|
|
numa_node_id = cpu_to_node(cpu);
|
|
else if (numa_node_id != cpu_to_node(cpu))
|
|
numa_node_id = -1;
|
|
#endif
|
|
} else if (dev_maps) {
|
|
/* fill in the new device map from the old device map */
|
|
map = xmap_dereference(dev_maps->cpu_map[cpu]);
|
|
RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
|
|
}
|
|
|
|
}
|
|
|
|
rcu_assign_pointer(dev->xps_maps, new_dev_maps);
|
|
|
|
/* Cleanup old maps */
|
|
if (dev_maps) {
|
|
for_each_possible_cpu(cpu) {
|
|
new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
|
|
map = xmap_dereference(dev_maps->cpu_map[cpu]);
|
|
if (map && map != new_map)
|
|
kfree_rcu(map, rcu);
|
|
}
|
|
|
|
kfree_rcu(dev_maps, rcu);
|
|
}
|
|
|
|
dev_maps = new_dev_maps;
|
|
active = true;
|
|
|
|
out_no_new_maps:
|
|
/* update Tx queue numa node */
|
|
netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
|
|
(numa_node_id >= 0) ? numa_node_id :
|
|
NUMA_NO_NODE);
|
|
|
|
if (!dev_maps)
|
|
goto out_no_maps;
|
|
|
|
/* removes queue from unused CPUs */
|
|
for_each_possible_cpu(cpu) {
|
|
if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu))
|
|
continue;
|
|
|
|
if (remove_xps_queue(dev_maps, cpu, index))
|
|
active = true;
|
|
}
|
|
|
|
/* free map if not active */
|
|
if (!active) {
|
|
RCU_INIT_POINTER(dev->xps_maps, NULL);
|
|
kfree_rcu(dev_maps, rcu);
|
|
}
|
|
|
|
out_no_maps:
|
|
mutex_unlock(&xps_map_mutex);
|
|
|
|
return 0;
|
|
error:
|
|
/* remove any maps that we added */
|
|
for_each_possible_cpu(cpu) {
|
|
new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
|
|
map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
|
|
NULL;
|
|
if (new_map && new_map != map)
|
|
kfree(new_map);
|
|
}
|
|
|
|
mutex_unlock(&xps_map_mutex);
|
|
|
|
kfree(new_dev_maps);
|
|
return -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL(netif_set_xps_queue);
|
|
|
|
#endif
|
|
/*
|
|
* Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
|
|
* greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
|
|
*/
|
|
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
|
|
{
|
|
int rc;
|
|
|
|
if (txq < 1 || txq > dev->num_tx_queues)
|
|
return -EINVAL;
|
|
|
|
if (dev->reg_state == NETREG_REGISTERED ||
|
|
dev->reg_state == NETREG_UNREGISTERING) {
|
|
ASSERT_RTNL();
|
|
|
|
rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
|
|
txq);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (dev->num_tc)
|
|
netif_setup_tc(dev, txq);
|
|
|
|
if (txq < dev->real_num_tx_queues) {
|
|
qdisc_reset_all_tx_gt(dev, txq);
|
|
#ifdef CONFIG_XPS
|
|
netif_reset_xps_queues_gt(dev, txq);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
dev->real_num_tx_queues = txq;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(netif_set_real_num_tx_queues);
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
/**
|
|
* netif_set_real_num_rx_queues - set actual number of RX queues used
|
|
* @dev: Network device
|
|
* @rxq: Actual number of RX queues
|
|
*
|
|
* This must be called either with the rtnl_lock held or before
|
|
* registration of the net device. Returns 0 on success, or a
|
|
* negative error code. If called before registration, it always
|
|
* succeeds.
|
|
*/
|
|
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
|
|
{
|
|
int rc;
|
|
|
|
if (rxq < 1 || rxq > dev->num_rx_queues)
|
|
return -EINVAL;
|
|
|
|
if (dev->reg_state == NETREG_REGISTERED) {
|
|
ASSERT_RTNL();
|
|
|
|
rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
|
|
rxq);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
dev->real_num_rx_queues = rxq;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(netif_set_real_num_rx_queues);
|
|
#endif
|
|
|
|
/**
|
|
* netif_get_num_default_rss_queues - default number of RSS queues
|
|
*
|
|
* This routine should set an upper limit on the number of RSS queues
|
|
* used by default by multiqueue devices.
|
|
*/
|
|
int netif_get_num_default_rss_queues(void)
|
|
{
|
|
return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
|
|
}
|
|
EXPORT_SYMBOL(netif_get_num_default_rss_queues);
|
|
|
|
static inline void __netif_reschedule(struct Qdisc *q)
|
|
{
|
|
struct softnet_data *sd;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
sd = &__get_cpu_var(softnet_data);
|
|
q->next_sched = NULL;
|
|
*sd->output_queue_tailp = q;
|
|
sd->output_queue_tailp = &q->next_sched;
|
|
raise_softirq_irqoff(NET_TX_SOFTIRQ);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
void __netif_schedule(struct Qdisc *q)
|
|
{
|
|
if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
|
|
__netif_reschedule(q);
|
|
}
|
|
EXPORT_SYMBOL(__netif_schedule);
|
|
|
|
struct dev_kfree_skb_cb {
|
|
enum skb_free_reason reason;
|
|
};
|
|
|
|
static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb)
|
|
{
|
|
return (struct dev_kfree_skb_cb *)skb->cb;
|
|
}
|
|
|
|
void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (likely(atomic_read(&skb->users) == 1)) {
|
|
smp_rmb();
|
|
atomic_set(&skb->users, 0);
|
|
} else if (likely(!atomic_dec_and_test(&skb->users))) {
|
|
return;
|
|
}
|
|
get_kfree_skb_cb(skb)->reason = reason;
|
|
local_irq_save(flags);
|
|
skb->next = __this_cpu_read(softnet_data.completion_queue);
|
|
__this_cpu_write(softnet_data.completion_queue, skb);
|
|
raise_softirq_irqoff(NET_TX_SOFTIRQ);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(__dev_kfree_skb_irq);
|
|
|
|
void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason)
|
|
{
|
|
if (in_irq() || irqs_disabled())
|
|
__dev_kfree_skb_irq(skb, reason);
|
|
else
|
|
dev_kfree_skb(skb);
|
|
}
|
|
EXPORT_SYMBOL(__dev_kfree_skb_any);
|
|
|
|
|
|
/**
|
|
* netif_device_detach - mark device as removed
|
|
* @dev: network device
|
|
*
|
|
* Mark device as removed from system and therefore no longer available.
|
|
*/
|
|
void netif_device_detach(struct net_device *dev)
|
|
{
|
|
if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
|
|
netif_running(dev)) {
|
|
netif_tx_stop_all_queues(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netif_device_detach);
|
|
|
|
/**
|
|
* netif_device_attach - mark device as attached
|
|
* @dev: network device
|
|
*
|
|
* Mark device as attached from system and restart if needed.
|
|
*/
|
|
void netif_device_attach(struct net_device *dev)
|
|
{
|
|
if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
|
|
netif_running(dev)) {
|
|
netif_tx_wake_all_queues(dev);
|
|
__netdev_watchdog_up(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netif_device_attach);
|
|
|
|
static void skb_warn_bad_offload(const struct sk_buff *skb)
|
|
{
|
|
static const netdev_features_t null_features = 0;
|
|
struct net_device *dev = skb->dev;
|
|
const char *driver = "";
|
|
|
|
if (!net_ratelimit())
|
|
return;
|
|
|
|
if (dev && dev->dev.parent)
|
|
driver = dev_driver_string(dev->dev.parent);
|
|
|
|
WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
|
|
"gso_type=%d ip_summed=%d\n",
|
|
driver, dev ? &dev->features : &null_features,
|
|
skb->sk ? &skb->sk->sk_route_caps : &null_features,
|
|
skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
|
|
skb_shinfo(skb)->gso_type, skb->ip_summed);
|
|
}
|
|
|
|
/*
|
|
* Invalidate hardware checksum when packet is to be mangled, and
|
|
* complete checksum manually on outgoing path.
|
|
*/
|
|
int skb_checksum_help(struct sk_buff *skb)
|
|
{
|
|
__wsum csum;
|
|
int ret = 0, offset;
|
|
|
|
if (skb->ip_summed == CHECKSUM_COMPLETE)
|
|
goto out_set_summed;
|
|
|
|
if (unlikely(skb_shinfo(skb)->gso_size)) {
|
|
skb_warn_bad_offload(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Before computing a checksum, we should make sure no frag could
|
|
* be modified by an external entity : checksum could be wrong.
|
|
*/
|
|
if (skb_has_shared_frag(skb)) {
|
|
ret = __skb_linearize(skb);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
offset = skb_checksum_start_offset(skb);
|
|
BUG_ON(offset >= skb_headlen(skb));
|
|
csum = skb_checksum(skb, offset, skb->len - offset, 0);
|
|
|
|
offset += skb->csum_offset;
|
|
BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
|
|
|
|
if (skb_cloned(skb) &&
|
|
!skb_clone_writable(skb, offset + sizeof(__sum16))) {
|
|
ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
*(__sum16 *)(skb->data + offset) = csum_fold(csum);
|
|
out_set_summed:
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(skb_checksum_help);
|
|
|
|
__be16 skb_network_protocol(struct sk_buff *skb)
|
|
{
|
|
__be16 type = skb->protocol;
|
|
int vlan_depth = ETH_HLEN;
|
|
|
|
/* Tunnel gso handlers can set protocol to ethernet. */
|
|
if (type == htons(ETH_P_TEB)) {
|
|
struct ethhdr *eth;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
|
|
return 0;
|
|
|
|
eth = (struct ethhdr *)skb_mac_header(skb);
|
|
type = eth->h_proto;
|
|
}
|
|
|
|
while (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) {
|
|
struct vlan_hdr *vh;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
|
|
return 0;
|
|
|
|
vh = (struct vlan_hdr *)(skb->data + vlan_depth);
|
|
type = vh->h_vlan_encapsulated_proto;
|
|
vlan_depth += VLAN_HLEN;
|
|
}
|
|
|
|
return type;
|
|
}
|
|
|
|
/**
|
|
* skb_mac_gso_segment - mac layer segmentation handler.
|
|
* @skb: buffer to segment
|
|
* @features: features for the output path (see dev->features)
|
|
*/
|
|
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
|
|
netdev_features_t features)
|
|
{
|
|
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
|
|
struct packet_offload *ptype;
|
|
__be16 type = skb_network_protocol(skb);
|
|
|
|
if (unlikely(!type))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
__skb_pull(skb, skb->mac_len);
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ptype, &offload_base, list) {
|
|
if (ptype->type == type && ptype->callbacks.gso_segment) {
|
|
if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
|
|
int err;
|
|
|
|
err = ptype->callbacks.gso_send_check(skb);
|
|
segs = ERR_PTR(err);
|
|
if (err || skb_gso_ok(skb, features))
|
|
break;
|
|
__skb_push(skb, (skb->data -
|
|
skb_network_header(skb)));
|
|
}
|
|
segs = ptype->callbacks.gso_segment(skb, features);
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
__skb_push(skb, skb->data - skb_mac_header(skb));
|
|
|
|
return segs;
|
|
}
|
|
EXPORT_SYMBOL(skb_mac_gso_segment);
|
|
|
|
|
|
/* openvswitch calls this on rx path, so we need a different check.
|
|
*/
|
|
static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
|
|
{
|
|
if (tx_path)
|
|
return skb->ip_summed != CHECKSUM_PARTIAL;
|
|
else
|
|
return skb->ip_summed == CHECKSUM_NONE;
|
|
}
|
|
|
|
/**
|
|
* __skb_gso_segment - Perform segmentation on skb.
|
|
* @skb: buffer to segment
|
|
* @features: features for the output path (see dev->features)
|
|
* @tx_path: whether it is called in TX path
|
|
*
|
|
* This function segments the given skb and returns a list of segments.
|
|
*
|
|
* It may return NULL if the skb requires no segmentation. This is
|
|
* only possible when GSO is used for verifying header integrity.
|
|
*/
|
|
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
|
|
netdev_features_t features, bool tx_path)
|
|
{
|
|
if (unlikely(skb_needs_check(skb, tx_path))) {
|
|
int err;
|
|
|
|
skb_warn_bad_offload(skb);
|
|
|
|
if (skb_header_cloned(skb) &&
|
|
(err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
|
|
SKB_GSO_CB(skb)->encap_level = 0;
|
|
|
|
skb_reset_mac_header(skb);
|
|
skb_reset_mac_len(skb);
|
|
|
|
return skb_mac_gso_segment(skb, features);
|
|
}
|
|
EXPORT_SYMBOL(__skb_gso_segment);
|
|
|
|
/* Take action when hardware reception checksum errors are detected. */
|
|
#ifdef CONFIG_BUG
|
|
void netdev_rx_csum_fault(struct net_device *dev)
|
|
{
|
|
if (net_ratelimit()) {
|
|
pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
|
|
dump_stack();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netdev_rx_csum_fault);
|
|
#endif
|
|
|
|
/* Actually, we should eliminate this check as soon as we know, that:
|
|
* 1. IOMMU is present and allows to map all the memory.
|
|
* 2. No high memory really exists on this machine.
|
|
*/
|
|
|
|
static int illegal_highdma(const struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
#ifdef CONFIG_HIGHMEM
|
|
int i;
|
|
if (!(dev->features & NETIF_F_HIGHDMA)) {
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
|
if (PageHighMem(skb_frag_page(frag)))
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (PCI_DMA_BUS_IS_PHYS) {
|
|
struct device *pdev = dev->dev.parent;
|
|
|
|
if (!pdev)
|
|
return 0;
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
|
dma_addr_t addr = page_to_phys(skb_frag_page(frag));
|
|
if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
|
|
return 1;
|
|
}
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
struct dev_gso_cb {
|
|
void (*destructor)(struct sk_buff *skb);
|
|
};
|
|
|
|
#define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
|
|
|
|
static void dev_gso_skb_destructor(struct sk_buff *skb)
|
|
{
|
|
struct dev_gso_cb *cb;
|
|
|
|
kfree_skb_list(skb->next);
|
|
skb->next = NULL;
|
|
|
|
cb = DEV_GSO_CB(skb);
|
|
if (cb->destructor)
|
|
cb->destructor(skb);
|
|
}
|
|
|
|
/**
|
|
* dev_gso_segment - Perform emulated hardware segmentation on skb.
|
|
* @skb: buffer to segment
|
|
* @features: device features as applicable to this skb
|
|
*
|
|
* This function segments the given skb and stores the list of segments
|
|
* in skb->next.
|
|
*/
|
|
static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features)
|
|
{
|
|
struct sk_buff *segs;
|
|
|
|
segs = skb_gso_segment(skb, features);
|
|
|
|
/* Verifying header integrity only. */
|
|
if (!segs)
|
|
return 0;
|
|
|
|
if (IS_ERR(segs))
|
|
return PTR_ERR(segs);
|
|
|
|
skb->next = segs;
|
|
DEV_GSO_CB(skb)->destructor = skb->destructor;
|
|
skb->destructor = dev_gso_skb_destructor;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static netdev_features_t harmonize_features(struct sk_buff *skb,
|
|
const struct net_device *dev,
|
|
netdev_features_t features)
|
|
{
|
|
if (skb->ip_summed != CHECKSUM_NONE &&
|
|
!can_checksum_protocol(features, skb_network_protocol(skb))) {
|
|
features &= ~NETIF_F_ALL_CSUM;
|
|
} else if (illegal_highdma(dev, skb)) {
|
|
features &= ~NETIF_F_SG;
|
|
}
|
|
|
|
return features;
|
|
}
|
|
|
|
netdev_features_t netif_skb_dev_features(struct sk_buff *skb,
|
|
const struct net_device *dev)
|
|
{
|
|
__be16 protocol = skb->protocol;
|
|
netdev_features_t features = dev->features;
|
|
|
|
if (skb_shinfo(skb)->gso_segs > dev->gso_max_segs)
|
|
features &= ~NETIF_F_GSO_MASK;
|
|
|
|
if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) {
|
|
struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
|
|
protocol = veh->h_vlan_encapsulated_proto;
|
|
} else if (!vlan_tx_tag_present(skb)) {
|
|
return harmonize_features(skb, dev, features);
|
|
}
|
|
|
|
features &= (dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX |
|
|
NETIF_F_HW_VLAN_STAG_TX);
|
|
|
|
if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD))
|
|
features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
|
|
NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_CTAG_TX |
|
|
NETIF_F_HW_VLAN_STAG_TX;
|
|
|
|
return harmonize_features(skb, dev, features);
|
|
}
|
|
EXPORT_SYMBOL(netif_skb_dev_features);
|
|
|
|
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
|
|
struct netdev_queue *txq)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
int rc = NETDEV_TX_OK;
|
|
unsigned int skb_len;
|
|
|
|
if (likely(!skb->next)) {
|
|
netdev_features_t features;
|
|
|
|
/*
|
|
* If device doesn't need skb->dst, release it right now while
|
|
* its hot in this cpu cache
|
|
*/
|
|
if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
|
|
skb_dst_drop(skb);
|
|
|
|
features = netif_skb_features(skb);
|
|
|
|
if (vlan_tx_tag_present(skb) &&
|
|
!vlan_hw_offload_capable(features, skb->vlan_proto)) {
|
|
skb = __vlan_put_tag(skb, skb->vlan_proto,
|
|
vlan_tx_tag_get(skb));
|
|
if (unlikely(!skb))
|
|
goto out;
|
|
|
|
skb->vlan_tci = 0;
|
|
}
|
|
|
|
/* If encapsulation offload request, verify we are testing
|
|
* hardware encapsulation features instead of standard
|
|
* features for the netdev
|
|
*/
|
|
if (skb->encapsulation)
|
|
features &= dev->hw_enc_features;
|
|
|
|
if (netif_needs_gso(skb, features)) {
|
|
if (unlikely(dev_gso_segment(skb, features)))
|
|
goto out_kfree_skb;
|
|
if (skb->next)
|
|
goto gso;
|
|
} else {
|
|
if (skb_needs_linearize(skb, features) &&
|
|
__skb_linearize(skb))
|
|
goto out_kfree_skb;
|
|
|
|
/* If packet is not checksummed and device does not
|
|
* support checksumming for this protocol, complete
|
|
* checksumming here.
|
|
*/
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
if (skb->encapsulation)
|
|
skb_set_inner_transport_header(skb,
|
|
skb_checksum_start_offset(skb));
|
|
else
|
|
skb_set_transport_header(skb,
|
|
skb_checksum_start_offset(skb));
|
|
if (!(features & NETIF_F_ALL_CSUM) &&
|
|
skb_checksum_help(skb))
|
|
goto out_kfree_skb;
|
|
}
|
|
}
|
|
|
|
if (!list_empty(&ptype_all))
|
|
dev_queue_xmit_nit(skb, dev);
|
|
|
|
skb_len = skb->len;
|
|
trace_net_dev_start_xmit(skb, dev);
|
|
rc = ops->ndo_start_xmit(skb, dev);
|
|
trace_net_dev_xmit(skb, rc, dev, skb_len);
|
|
if (rc == NETDEV_TX_OK)
|
|
txq_trans_update(txq);
|
|
return rc;
|
|
}
|
|
|
|
gso:
|
|
do {
|
|
struct sk_buff *nskb = skb->next;
|
|
|
|
skb->next = nskb->next;
|
|
nskb->next = NULL;
|
|
|
|
if (!list_empty(&ptype_all))
|
|
dev_queue_xmit_nit(nskb, dev);
|
|
|
|
skb_len = nskb->len;
|
|
trace_net_dev_start_xmit(nskb, dev);
|
|
rc = ops->ndo_start_xmit(nskb, dev);
|
|
trace_net_dev_xmit(nskb, rc, dev, skb_len);
|
|
if (unlikely(rc != NETDEV_TX_OK)) {
|
|
if (rc & ~NETDEV_TX_MASK)
|
|
goto out_kfree_gso_skb;
|
|
nskb->next = skb->next;
|
|
skb->next = nskb;
|
|
return rc;
|
|
}
|
|
txq_trans_update(txq);
|
|
if (unlikely(netif_xmit_stopped(txq) && skb->next))
|
|
return NETDEV_TX_BUSY;
|
|
} while (skb->next);
|
|
|
|
out_kfree_gso_skb:
|
|
if (likely(skb->next == NULL)) {
|
|
skb->destructor = DEV_GSO_CB(skb)->destructor;
|
|
consume_skb(skb);
|
|
return rc;
|
|
}
|
|
out_kfree_skb:
|
|
kfree_skb(skb);
|
|
out:
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_hard_start_xmit);
|
|
|
|
static void qdisc_pkt_len_init(struct sk_buff *skb)
|
|
{
|
|
const struct skb_shared_info *shinfo = skb_shinfo(skb);
|
|
|
|
qdisc_skb_cb(skb)->pkt_len = skb->len;
|
|
|
|
/* To get more precise estimation of bytes sent on wire,
|
|
* we add to pkt_len the headers size of all segments
|
|
*/
|
|
if (shinfo->gso_size) {
|
|
unsigned int hdr_len;
|
|
u16 gso_segs = shinfo->gso_segs;
|
|
|
|
/* mac layer + network layer */
|
|
hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
|
|
|
|
/* + transport layer */
|
|
if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
|
|
hdr_len += tcp_hdrlen(skb);
|
|
else
|
|
hdr_len += sizeof(struct udphdr);
|
|
|
|
if (shinfo->gso_type & SKB_GSO_DODGY)
|
|
gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
|
|
shinfo->gso_size);
|
|
|
|
qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
|
|
}
|
|
}
|
|
|
|
static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
|
|
struct net_device *dev,
|
|
struct netdev_queue *txq)
|
|
{
|
|
spinlock_t *root_lock = qdisc_lock(q);
|
|
bool contended;
|
|
int rc;
|
|
|
|
qdisc_pkt_len_init(skb);
|
|
qdisc_calculate_pkt_len(skb, q);
|
|
/*
|
|
* Heuristic to force contended enqueues to serialize on a
|
|
* separate lock before trying to get qdisc main lock.
|
|
* This permits __QDISC_STATE_RUNNING owner to get the lock more often
|
|
* and dequeue packets faster.
|
|
*/
|
|
contended = qdisc_is_running(q);
|
|
if (unlikely(contended))
|
|
spin_lock(&q->busylock);
|
|
|
|
spin_lock(root_lock);
|
|
if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
|
|
kfree_skb(skb);
|
|
rc = NET_XMIT_DROP;
|
|
} else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
|
|
qdisc_run_begin(q)) {
|
|
/*
|
|
* This is a work-conserving queue; there are no old skbs
|
|
* waiting to be sent out; and the qdisc is not running -
|
|
* xmit the skb directly.
|
|
*/
|
|
if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
|
|
skb_dst_force(skb);
|
|
|
|
qdisc_bstats_update(q, skb);
|
|
|
|
if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
|
|
if (unlikely(contended)) {
|
|
spin_unlock(&q->busylock);
|
|
contended = false;
|
|
}
|
|
__qdisc_run(q);
|
|
} else
|
|
qdisc_run_end(q);
|
|
|
|
rc = NET_XMIT_SUCCESS;
|
|
} else {
|
|
skb_dst_force(skb);
|
|
rc = q->enqueue(skb, q) & NET_XMIT_MASK;
|
|
if (qdisc_run_begin(q)) {
|
|
if (unlikely(contended)) {
|
|
spin_unlock(&q->busylock);
|
|
contended = false;
|
|
}
|
|
__qdisc_run(q);
|
|
}
|
|
}
|
|
spin_unlock(root_lock);
|
|
if (unlikely(contended))
|
|
spin_unlock(&q->busylock);
|
|
return rc;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
|
|
static void skb_update_prio(struct sk_buff *skb)
|
|
{
|
|
struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
|
|
|
|
if (!skb->priority && skb->sk && map) {
|
|
unsigned int prioidx = skb->sk->sk_cgrp_prioidx;
|
|
|
|
if (prioidx < map->priomap_len)
|
|
skb->priority = map->priomap[prioidx];
|
|
}
|
|
}
|
|
#else
|
|
#define skb_update_prio(skb)
|
|
#endif
|
|
|
|
static DEFINE_PER_CPU(int, xmit_recursion);
|
|
#define RECURSION_LIMIT 10
|
|
|
|
/**
|
|
* dev_loopback_xmit - loop back @skb
|
|
* @skb: buffer to transmit
|
|
*/
|
|
int dev_loopback_xmit(struct sk_buff *skb)
|
|
{
|
|
skb_reset_mac_header(skb);
|
|
__skb_pull(skb, skb_network_offset(skb));
|
|
skb->pkt_type = PACKET_LOOPBACK;
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
WARN_ON(!skb_dst(skb));
|
|
skb_dst_force(skb);
|
|
netif_rx_ni(skb);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dev_loopback_xmit);
|
|
|
|
/**
|
|
* __dev_queue_xmit - transmit a buffer
|
|
* @skb: buffer to transmit
|
|
* @accel_priv: private data used for L2 forwarding offload
|
|
*
|
|
* Queue a buffer for transmission to a network device. The caller must
|
|
* have set the device and priority and built the buffer before calling
|
|
* this function. The function can be called from an interrupt.
|
|
*
|
|
* A negative errno code is returned on a failure. A success does not
|
|
* guarantee the frame will be transmitted as it may be dropped due
|
|
* to congestion or traffic shaping.
|
|
*
|
|
* -----------------------------------------------------------------------------------
|
|
* I notice this method can also return errors from the queue disciplines,
|
|
* including NET_XMIT_DROP, which is a positive value. So, errors can also
|
|
* be positive.
|
|
*
|
|
* Regardless of the return value, the skb is consumed, so it is currently
|
|
* difficult to retry a send to this method. (You can bump the ref count
|
|
* before sending to hold a reference for retry if you are careful.)
|
|
*
|
|
* When calling this method, interrupts MUST be enabled. This is because
|
|
* the BH enable code must have IRQs enabled so that it will not deadlock.
|
|
* --BLG
|
|
*/
|
|
static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
|
|
{
|
|
struct net_device *dev = skb->dev;
|
|
struct netdev_queue *txq;
|
|
struct Qdisc *q;
|
|
int rc = -ENOMEM;
|
|
|
|
skb_reset_mac_header(skb);
|
|
|
|
/* Disable soft irqs for various locks below. Also
|
|
* stops preemption for RCU.
|
|
*/
|
|
rcu_read_lock_bh();
|
|
|
|
skb_update_prio(skb);
|
|
|
|
txq = netdev_pick_tx(dev, skb, accel_priv);
|
|
q = rcu_dereference_bh(txq->qdisc);
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
|
|
#endif
|
|
trace_net_dev_queue(skb);
|
|
if (q->enqueue) {
|
|
rc = __dev_xmit_skb(skb, q, dev, txq);
|
|
goto out;
|
|
}
|
|
|
|
/* The device has no queue. Common case for software devices:
|
|
loopback, all the sorts of tunnels...
|
|
|
|
Really, it is unlikely that netif_tx_lock protection is necessary
|
|
here. (f.e. loopback and IP tunnels are clean ignoring statistics
|
|
counters.)
|
|
However, it is possible, that they rely on protection
|
|
made by us here.
|
|
|
|
Check this and shot the lock. It is not prone from deadlocks.
|
|
Either shot noqueue qdisc, it is even simpler 8)
|
|
*/
|
|
if (dev->flags & IFF_UP) {
|
|
int cpu = smp_processor_id(); /* ok because BHs are off */
|
|
|
|
if (txq->xmit_lock_owner != cpu) {
|
|
|
|
if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
|
|
goto recursion_alert;
|
|
|
|
HARD_TX_LOCK(dev, txq, cpu);
|
|
|
|
if (!netif_xmit_stopped(txq)) {
|
|
__this_cpu_inc(xmit_recursion);
|
|
rc = dev_hard_start_xmit(skb, dev, txq);
|
|
__this_cpu_dec(xmit_recursion);
|
|
if (dev_xmit_complete(rc)) {
|
|
HARD_TX_UNLOCK(dev, txq);
|
|
goto out;
|
|
}
|
|
}
|
|
HARD_TX_UNLOCK(dev, txq);
|
|
net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
|
|
dev->name);
|
|
} else {
|
|
/* Recursion is detected! It is possible,
|
|
* unfortunately
|
|
*/
|
|
recursion_alert:
|
|
net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
|
|
dev->name);
|
|
}
|
|
}
|
|
|
|
rc = -ENETDOWN;
|
|
rcu_read_unlock_bh();
|
|
|
|
kfree_skb(skb);
|
|
return rc;
|
|
out:
|
|
rcu_read_unlock_bh();
|
|
return rc;
|
|
}
|
|
|
|
int dev_queue_xmit(struct sk_buff *skb)
|
|
{
|
|
return __dev_queue_xmit(skb, NULL);
|
|
}
|
|
EXPORT_SYMBOL(dev_queue_xmit);
|
|
|
|
int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv)
|
|
{
|
|
return __dev_queue_xmit(skb, accel_priv);
|
|
}
|
|
EXPORT_SYMBOL(dev_queue_xmit_accel);
|
|
|
|
|
|
/*=======================================================================
|
|
Receiver routines
|
|
=======================================================================*/
|
|
|
|
int netdev_max_backlog __read_mostly = 1000;
|
|
EXPORT_SYMBOL(netdev_max_backlog);
|
|
|
|
int netdev_tstamp_prequeue __read_mostly = 1;
|
|
int netdev_budget __read_mostly = 300;
|
|
int weight_p __read_mostly = 64; /* old backlog weight */
|
|
|
|
/* Called with irq disabled */
|
|
static inline void ____napi_schedule(struct softnet_data *sd,
|
|
struct napi_struct *napi)
|
|
{
|
|
list_add_tail(&napi->poll_list, &sd->poll_list);
|
|
__raise_softirq_irqoff(NET_RX_SOFTIRQ);
|
|
}
|
|
|
|
#ifdef CONFIG_RPS
|
|
|
|
/* One global table that all flow-based protocols share. */
|
|
struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
|
|
EXPORT_SYMBOL(rps_sock_flow_table);
|
|
|
|
struct static_key rps_needed __read_mostly;
|
|
|
|
static struct rps_dev_flow *
|
|
set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
|
|
struct rps_dev_flow *rflow, u16 next_cpu)
|
|
{
|
|
if (next_cpu != RPS_NO_CPU) {
|
|
#ifdef CONFIG_RFS_ACCEL
|
|
struct netdev_rx_queue *rxqueue;
|
|
struct rps_dev_flow_table *flow_table;
|
|
struct rps_dev_flow *old_rflow;
|
|
u32 flow_id;
|
|
u16 rxq_index;
|
|
int rc;
|
|
|
|
/* Should we steer this flow to a different hardware queue? */
|
|
if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
|
|
!(dev->features & NETIF_F_NTUPLE))
|
|
goto out;
|
|
rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
|
|
if (rxq_index == skb_get_rx_queue(skb))
|
|
goto out;
|
|
|
|
rxqueue = dev->_rx + rxq_index;
|
|
flow_table = rcu_dereference(rxqueue->rps_flow_table);
|
|
if (!flow_table)
|
|
goto out;
|
|
flow_id = skb->rxhash & flow_table->mask;
|
|
rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
|
|
rxq_index, flow_id);
|
|
if (rc < 0)
|
|
goto out;
|
|
old_rflow = rflow;
|
|
rflow = &flow_table->flows[flow_id];
|
|
rflow->filter = rc;
|
|
if (old_rflow->filter == rflow->filter)
|
|
old_rflow->filter = RPS_NO_FILTER;
|
|
out:
|
|
#endif
|
|
rflow->last_qtail =
|
|
per_cpu(softnet_data, next_cpu).input_queue_head;
|
|
}
|
|
|
|
rflow->cpu = next_cpu;
|
|
return rflow;
|
|
}
|
|
|
|
/*
|
|
* get_rps_cpu is called from netif_receive_skb and returns the target
|
|
* CPU from the RPS map of the receiving queue for a given skb.
|
|
* rcu_read_lock must be held on entry.
|
|
*/
|
|
static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
|
|
struct rps_dev_flow **rflowp)
|
|
{
|
|
struct netdev_rx_queue *rxqueue;
|
|
struct rps_map *map;
|
|
struct rps_dev_flow_table *flow_table;
|
|
struct rps_sock_flow_table *sock_flow_table;
|
|
int cpu = -1;
|
|
u16 tcpu;
|
|
|
|
if (skb_rx_queue_recorded(skb)) {
|
|
u16 index = skb_get_rx_queue(skb);
|
|
if (unlikely(index >= dev->real_num_rx_queues)) {
|
|
WARN_ONCE(dev->real_num_rx_queues > 1,
|
|
"%s received packet on queue %u, but number "
|
|
"of RX queues is %u\n",
|
|
dev->name, index, dev->real_num_rx_queues);
|
|
goto done;
|
|
}
|
|
rxqueue = dev->_rx + index;
|
|
} else
|
|
rxqueue = dev->_rx;
|
|
|
|
map = rcu_dereference(rxqueue->rps_map);
|
|
if (map) {
|
|
if (map->len == 1 &&
|
|
!rcu_access_pointer(rxqueue->rps_flow_table)) {
|
|
tcpu = map->cpus[0];
|
|
if (cpu_online(tcpu))
|
|
cpu = tcpu;
|
|
goto done;
|
|
}
|
|
} else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
|
|
goto done;
|
|
}
|
|
|
|
skb_reset_network_header(skb);
|
|
if (!skb_get_hash(skb))
|
|
goto done;
|
|
|
|
flow_table = rcu_dereference(rxqueue->rps_flow_table);
|
|
sock_flow_table = rcu_dereference(rps_sock_flow_table);
|
|
if (flow_table && sock_flow_table) {
|
|
u16 next_cpu;
|
|
struct rps_dev_flow *rflow;
|
|
|
|
rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
|
|
tcpu = rflow->cpu;
|
|
|
|
next_cpu = sock_flow_table->ents[skb->rxhash &
|
|
sock_flow_table->mask];
|
|
|
|
/*
|
|
* If the desired CPU (where last recvmsg was done) is
|
|
* different from current CPU (one in the rx-queue flow
|
|
* table entry), switch if one of the following holds:
|
|
* - Current CPU is unset (equal to RPS_NO_CPU).
|
|
* - Current CPU is offline.
|
|
* - The current CPU's queue tail has advanced beyond the
|
|
* last packet that was enqueued using this table entry.
|
|
* This guarantees that all previous packets for the flow
|
|
* have been dequeued, thus preserving in order delivery.
|
|
*/
|
|
if (unlikely(tcpu != next_cpu) &&
|
|
(tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
|
|
((int)(per_cpu(softnet_data, tcpu).input_queue_head -
|
|
rflow->last_qtail)) >= 0)) {
|
|
tcpu = next_cpu;
|
|
rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
|
|
}
|
|
|
|
if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
|
|
*rflowp = rflow;
|
|
cpu = tcpu;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (map) {
|
|
tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
|
|
|
|
if (cpu_online(tcpu)) {
|
|
cpu = tcpu;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
return cpu;
|
|
}
|
|
|
|
#ifdef CONFIG_RFS_ACCEL
|
|
|
|
/**
|
|
* rps_may_expire_flow - check whether an RFS hardware filter may be removed
|
|
* @dev: Device on which the filter was set
|
|
* @rxq_index: RX queue index
|
|
* @flow_id: Flow ID passed to ndo_rx_flow_steer()
|
|
* @filter_id: Filter ID returned by ndo_rx_flow_steer()
|
|
*
|
|
* Drivers that implement ndo_rx_flow_steer() should periodically call
|
|
* this function for each installed filter and remove the filters for
|
|
* which it returns %true.
|
|
*/
|
|
bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
|
|
u32 flow_id, u16 filter_id)
|
|
{
|
|
struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
|
|
struct rps_dev_flow_table *flow_table;
|
|
struct rps_dev_flow *rflow;
|
|
bool expire = true;
|
|
int cpu;
|
|
|
|
rcu_read_lock();
|
|
flow_table = rcu_dereference(rxqueue->rps_flow_table);
|
|
if (flow_table && flow_id <= flow_table->mask) {
|
|
rflow = &flow_table->flows[flow_id];
|
|
cpu = ACCESS_ONCE(rflow->cpu);
|
|
if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
|
|
((int)(per_cpu(softnet_data, cpu).input_queue_head -
|
|
rflow->last_qtail) <
|
|
(int)(10 * flow_table->mask)))
|
|
expire = false;
|
|
}
|
|
rcu_read_unlock();
|
|
return expire;
|
|
}
|
|
EXPORT_SYMBOL(rps_may_expire_flow);
|
|
|
|
#endif /* CONFIG_RFS_ACCEL */
|
|
|
|
/* Called from hardirq (IPI) context */
|
|
static void rps_trigger_softirq(void *data)
|
|
{
|
|
struct softnet_data *sd = data;
|
|
|
|
____napi_schedule(sd, &sd->backlog);
|
|
sd->received_rps++;
|
|
}
|
|
|
|
#endif /* CONFIG_RPS */
|
|
|
|
/*
|
|
* Check if this softnet_data structure is another cpu one
|
|
* If yes, queue it to our IPI list and return 1
|
|
* If no, return 0
|
|
*/
|
|
static int rps_ipi_queued(struct softnet_data *sd)
|
|
{
|
|
#ifdef CONFIG_RPS
|
|
struct softnet_data *mysd = &__get_cpu_var(softnet_data);
|
|
|
|
if (sd != mysd) {
|
|
sd->rps_ipi_next = mysd->rps_ipi_list;
|
|
mysd->rps_ipi_list = sd;
|
|
|
|
__raise_softirq_irqoff(NET_RX_SOFTIRQ);
|
|
return 1;
|
|
}
|
|
#endif /* CONFIG_RPS */
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_NET_FLOW_LIMIT
|
|
int netdev_flow_limit_table_len __read_mostly = (1 << 12);
|
|
#endif
|
|
|
|
static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen)
|
|
{
|
|
#ifdef CONFIG_NET_FLOW_LIMIT
|
|
struct sd_flow_limit *fl;
|
|
struct softnet_data *sd;
|
|
unsigned int old_flow, new_flow;
|
|
|
|
if (qlen < (netdev_max_backlog >> 1))
|
|
return false;
|
|
|
|
sd = &__get_cpu_var(softnet_data);
|
|
|
|
rcu_read_lock();
|
|
fl = rcu_dereference(sd->flow_limit);
|
|
if (fl) {
|
|
new_flow = skb_get_hash(skb) & (fl->num_buckets - 1);
|
|
old_flow = fl->history[fl->history_head];
|
|
fl->history[fl->history_head] = new_flow;
|
|
|
|
fl->history_head++;
|
|
fl->history_head &= FLOW_LIMIT_HISTORY - 1;
|
|
|
|
if (likely(fl->buckets[old_flow]))
|
|
fl->buckets[old_flow]--;
|
|
|
|
if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) {
|
|
fl->count++;
|
|
rcu_read_unlock();
|
|
return true;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* enqueue_to_backlog is called to queue an skb to a per CPU backlog
|
|
* queue (may be a remote CPU queue).
|
|
*/
|
|
static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
|
|
unsigned int *qtail)
|
|
{
|
|
struct softnet_data *sd;
|
|
unsigned long flags;
|
|
unsigned int qlen;
|
|
|
|
sd = &per_cpu(softnet_data, cpu);
|
|
|
|
local_irq_save(flags);
|
|
|
|
rps_lock(sd);
|
|
qlen = skb_queue_len(&sd->input_pkt_queue);
|
|
if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) {
|
|
if (skb_queue_len(&sd->input_pkt_queue)) {
|
|
enqueue:
|
|
__skb_queue_tail(&sd->input_pkt_queue, skb);
|
|
input_queue_tail_incr_save(sd, qtail);
|
|
rps_unlock(sd);
|
|
local_irq_restore(flags);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
/* Schedule NAPI for backlog device
|
|
* We can use non atomic operation since we own the queue lock
|
|
*/
|
|
if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
|
|
if (!rps_ipi_queued(sd))
|
|
____napi_schedule(sd, &sd->backlog);
|
|
}
|
|
goto enqueue;
|
|
}
|
|
|
|
sd->dropped++;
|
|
rps_unlock(sd);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
atomic_long_inc(&skb->dev->rx_dropped);
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
static int netif_rx_internal(struct sk_buff *skb)
|
|
{
|
|
int ret;
|
|
|
|
/* if netpoll wants it, pretend we never saw it */
|
|
if (netpoll_rx(skb))
|
|
return NET_RX_DROP;
|
|
|
|
net_timestamp_check(netdev_tstamp_prequeue, skb);
|
|
|
|
trace_netif_rx(skb);
|
|
#ifdef CONFIG_RPS
|
|
if (static_key_false(&rps_needed)) {
|
|
struct rps_dev_flow voidflow, *rflow = &voidflow;
|
|
int cpu;
|
|
|
|
preempt_disable();
|
|
rcu_read_lock();
|
|
|
|
cpu = get_rps_cpu(skb->dev, skb, &rflow);
|
|
if (cpu < 0)
|
|
cpu = smp_processor_id();
|
|
|
|
ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
|
|
|
|
rcu_read_unlock();
|
|
preempt_enable();
|
|
} else
|
|
#endif
|
|
{
|
|
unsigned int qtail;
|
|
ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
|
|
put_cpu();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* netif_rx - post buffer to the network code
|
|
* @skb: buffer to post
|
|
*
|
|
* This function receives a packet from a device driver and queues it for
|
|
* the upper (protocol) levels to process. It always succeeds. The buffer
|
|
* may be dropped during processing for congestion control or by the
|
|
* protocol layers.
|
|
*
|
|
* return values:
|
|
* NET_RX_SUCCESS (no congestion)
|
|
* NET_RX_DROP (packet was dropped)
|
|
*
|
|
*/
|
|
|
|
int netif_rx(struct sk_buff *skb)
|
|
{
|
|
trace_netif_rx_entry(skb);
|
|
|
|
return netif_rx_internal(skb);
|
|
}
|
|
EXPORT_SYMBOL(netif_rx);
|
|
|
|
int netif_rx_ni(struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
trace_netif_rx_ni_entry(skb);
|
|
|
|
preempt_disable();
|
|
err = netif_rx_internal(skb);
|
|
if (local_softirq_pending())
|
|
do_softirq();
|
|
preempt_enable();
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(netif_rx_ni);
|
|
|
|
static void net_tx_action(struct softirq_action *h)
|
|
{
|
|
struct softnet_data *sd = &__get_cpu_var(softnet_data);
|
|
|
|
if (sd->completion_queue) {
|
|
struct sk_buff *clist;
|
|
|
|
local_irq_disable();
|
|
clist = sd->completion_queue;
|
|
sd->completion_queue = NULL;
|
|
local_irq_enable();
|
|
|
|
while (clist) {
|
|
struct sk_buff *skb = clist;
|
|
clist = clist->next;
|
|
|
|
WARN_ON(atomic_read(&skb->users));
|
|
if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED))
|
|
trace_consume_skb(skb);
|
|
else
|
|
trace_kfree_skb(skb, net_tx_action);
|
|
__kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
if (sd->output_queue) {
|
|
struct Qdisc *head;
|
|
|
|
local_irq_disable();
|
|
head = sd->output_queue;
|
|
sd->output_queue = NULL;
|
|
sd->output_queue_tailp = &sd->output_queue;
|
|
local_irq_enable();
|
|
|
|
while (head) {
|
|
struct Qdisc *q = head;
|
|
spinlock_t *root_lock;
|
|
|
|
head = head->next_sched;
|
|
|
|
root_lock = qdisc_lock(q);
|
|
if (spin_trylock(root_lock)) {
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(__QDISC_STATE_SCHED,
|
|
&q->state);
|
|
qdisc_run(q);
|
|
spin_unlock(root_lock);
|
|
} else {
|
|
if (!test_bit(__QDISC_STATE_DEACTIVATED,
|
|
&q->state)) {
|
|
__netif_reschedule(q);
|
|
} else {
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(__QDISC_STATE_SCHED,
|
|
&q->state);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
|
|
(defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
|
|
/* This hook is defined here for ATM LANE */
|
|
int (*br_fdb_test_addr_hook)(struct net_device *dev,
|
|
unsigned char *addr) __read_mostly;
|
|
EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
/* TODO: Maybe we should just force sch_ingress to be compiled in
|
|
* when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
|
|
* a compare and 2 stores extra right now if we dont have it on
|
|
* but have CONFIG_NET_CLS_ACT
|
|
* NOTE: This doesn't stop any functionality; if you dont have
|
|
* the ingress scheduler, you just can't add policies on ingress.
|
|
*
|
|
*/
|
|
static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
|
|
{
|
|
struct net_device *dev = skb->dev;
|
|
u32 ttl = G_TC_RTTL(skb->tc_verd);
|
|
int result = TC_ACT_OK;
|
|
struct Qdisc *q;
|
|
|
|
if (unlikely(MAX_RED_LOOP < ttl++)) {
|
|
net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
|
|
skb->skb_iif, dev->ifindex);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
|
|
skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
|
|
|
|
q = rxq->qdisc;
|
|
if (q != &noop_qdisc) {
|
|
spin_lock(qdisc_lock(q));
|
|
if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
|
|
result = qdisc_enqueue_root(skb, q);
|
|
spin_unlock(qdisc_lock(q));
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
|
|
struct packet_type **pt_prev,
|
|
int *ret, struct net_device *orig_dev)
|
|
{
|
|
struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
|
|
|
|
if (!rxq || rxq->qdisc == &noop_qdisc)
|
|
goto out;
|
|
|
|
if (*pt_prev) {
|
|
*ret = deliver_skb(skb, *pt_prev, orig_dev);
|
|
*pt_prev = NULL;
|
|
}
|
|
|
|
switch (ing_filter(skb, rxq)) {
|
|
case TC_ACT_SHOT:
|
|
case TC_ACT_STOLEN:
|
|
kfree_skb(skb);
|
|
return NULL;
|
|
}
|
|
|
|
out:
|
|
skb->tc_verd = 0;
|
|
return skb;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* netdev_rx_handler_register - register receive handler
|
|
* @dev: device to register a handler for
|
|
* @rx_handler: receive handler to register
|
|
* @rx_handler_data: data pointer that is used by rx handler
|
|
*
|
|
* Register a receive hander for a device. This handler will then be
|
|
* called from __netif_receive_skb. A negative errno code is returned
|
|
* on a failure.
|
|
*
|
|
* The caller must hold the rtnl_mutex.
|
|
*
|
|
* For a general description of rx_handler, see enum rx_handler_result.
|
|
*/
|
|
int netdev_rx_handler_register(struct net_device *dev,
|
|
rx_handler_func_t *rx_handler,
|
|
void *rx_handler_data)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
if (dev->rx_handler)
|
|
return -EBUSY;
|
|
|
|
/* Note: rx_handler_data must be set before rx_handler */
|
|
rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
|
|
rcu_assign_pointer(dev->rx_handler, rx_handler);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
|
|
|
|
/**
|
|
* netdev_rx_handler_unregister - unregister receive handler
|
|
* @dev: device to unregister a handler from
|
|
*
|
|
* Unregister a receive handler from a device.
|
|
*
|
|
* The caller must hold the rtnl_mutex.
|
|
*/
|
|
void netdev_rx_handler_unregister(struct net_device *dev)
|
|
{
|
|
|
|
ASSERT_RTNL();
|
|
RCU_INIT_POINTER(dev->rx_handler, NULL);
|
|
/* a reader seeing a non NULL rx_handler in a rcu_read_lock()
|
|
* section has a guarantee to see a non NULL rx_handler_data
|
|
* as well.
|
|
*/
|
|
synchronize_net();
|
|
RCU_INIT_POINTER(dev->rx_handler_data, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
|
|
|
|
/*
|
|
* Limit the use of PFMEMALLOC reserves to those protocols that implement
|
|
* the special handling of PFMEMALLOC skbs.
|
|
*/
|
|
static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
|
|
{
|
|
switch (skb->protocol) {
|
|
case __constant_htons(ETH_P_ARP):
|
|
case __constant_htons(ETH_P_IP):
|
|
case __constant_htons(ETH_P_IPV6):
|
|
case __constant_htons(ETH_P_8021Q):
|
|
case __constant_htons(ETH_P_8021AD):
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)
|
|
{
|
|
struct packet_type *ptype, *pt_prev;
|
|
rx_handler_func_t *rx_handler;
|
|
struct net_device *orig_dev;
|
|
struct net_device *null_or_dev;
|
|
bool deliver_exact = false;
|
|
int ret = NET_RX_DROP;
|
|
__be16 type;
|
|
|
|
net_timestamp_check(!netdev_tstamp_prequeue, skb);
|
|
|
|
trace_netif_receive_skb(skb);
|
|
|
|
/* if we've gotten here through NAPI, check netpoll */
|
|
if (netpoll_receive_skb(skb))
|
|
goto out;
|
|
|
|
orig_dev = skb->dev;
|
|
|
|
skb_reset_network_header(skb);
|
|
if (!skb_transport_header_was_set(skb))
|
|
skb_reset_transport_header(skb);
|
|
skb_reset_mac_len(skb);
|
|
|
|
pt_prev = NULL;
|
|
|
|
rcu_read_lock();
|
|
|
|
another_round:
|
|
skb->skb_iif = skb->dev->ifindex;
|
|
|
|
__this_cpu_inc(softnet_data.processed);
|
|
|
|
if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
|
|
skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
|
|
skb = vlan_untag(skb);
|
|
if (unlikely(!skb))
|
|
goto unlock;
|
|
}
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (skb->tc_verd & TC_NCLS) {
|
|
skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
|
|
goto ncls;
|
|
}
|
|
#endif
|
|
|
|
if (pfmemalloc)
|
|
goto skip_taps;
|
|
|
|
list_for_each_entry_rcu(ptype, &ptype_all, list) {
|
|
if (!ptype->dev || ptype->dev == skb->dev) {
|
|
if (pt_prev)
|
|
ret = deliver_skb(skb, pt_prev, orig_dev);
|
|
pt_prev = ptype;
|
|
}
|
|
}
|
|
|
|
skip_taps:
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
|
|
if (!skb)
|
|
goto unlock;
|
|
ncls:
|
|
#endif
|
|
|
|
if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
|
|
goto drop;
|
|
|
|
if (vlan_tx_tag_present(skb)) {
|
|
if (pt_prev) {
|
|
ret = deliver_skb(skb, pt_prev, orig_dev);
|
|
pt_prev = NULL;
|
|
}
|
|
if (vlan_do_receive(&skb))
|
|
goto another_round;
|
|
else if (unlikely(!skb))
|
|
goto unlock;
|
|
}
|
|
|
|
rx_handler = rcu_dereference(skb->dev->rx_handler);
|
|
if (rx_handler) {
|
|
if (pt_prev) {
|
|
ret = deliver_skb(skb, pt_prev, orig_dev);
|
|
pt_prev = NULL;
|
|
}
|
|
switch (rx_handler(&skb)) {
|
|
case RX_HANDLER_CONSUMED:
|
|
ret = NET_RX_SUCCESS;
|
|
goto unlock;
|
|
case RX_HANDLER_ANOTHER:
|
|
goto another_round;
|
|
case RX_HANDLER_EXACT:
|
|
deliver_exact = true;
|
|
case RX_HANDLER_PASS:
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
if (unlikely(vlan_tx_tag_present(skb))) {
|
|
if (vlan_tx_tag_get_id(skb))
|
|
skb->pkt_type = PACKET_OTHERHOST;
|
|
/* Note: we might in the future use prio bits
|
|
* and set skb->priority like in vlan_do_receive()
|
|
* For the time being, just ignore Priority Code Point
|
|
*/
|
|
skb->vlan_tci = 0;
|
|
}
|
|
|
|
/* deliver only exact match when indicated */
|
|
null_or_dev = deliver_exact ? skb->dev : NULL;
|
|
|
|
type = skb->protocol;
|
|
list_for_each_entry_rcu(ptype,
|
|
&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
|
|
if (ptype->type == type &&
|
|
(ptype->dev == null_or_dev || ptype->dev == skb->dev ||
|
|
ptype->dev == orig_dev)) {
|
|
if (pt_prev)
|
|
ret = deliver_skb(skb, pt_prev, orig_dev);
|
|
pt_prev = ptype;
|
|
}
|
|
}
|
|
|
|
if (pt_prev) {
|
|
if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
|
|
goto drop;
|
|
else
|
|
ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
|
|
} else {
|
|
drop:
|
|
atomic_long_inc(&skb->dev->rx_dropped);
|
|
kfree_skb(skb);
|
|
/* Jamal, now you will not able to escape explaining
|
|
* me how you were going to use this. :-)
|
|
*/
|
|
ret = NET_RX_DROP;
|
|
}
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int __netif_receive_skb(struct sk_buff *skb)
|
|
{
|
|
int ret;
|
|
|
|
if (sk_memalloc_socks() && skb_pfmemalloc(skb)) {
|
|
unsigned long pflags = current->flags;
|
|
|
|
/*
|
|
* PFMEMALLOC skbs are special, they should
|
|
* - be delivered to SOCK_MEMALLOC sockets only
|
|
* - stay away from userspace
|
|
* - have bounded memory usage
|
|
*
|
|
* Use PF_MEMALLOC as this saves us from propagating the allocation
|
|
* context down to all allocation sites.
|
|
*/
|
|
current->flags |= PF_MEMALLOC;
|
|
ret = __netif_receive_skb_core(skb, true);
|
|
tsk_restore_flags(current, pflags, PF_MEMALLOC);
|
|
} else
|
|
ret = __netif_receive_skb_core(skb, false);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int netif_receive_skb_internal(struct sk_buff *skb)
|
|
{
|
|
net_timestamp_check(netdev_tstamp_prequeue, skb);
|
|
|
|
if (skb_defer_rx_timestamp(skb))
|
|
return NET_RX_SUCCESS;
|
|
|
|
#ifdef CONFIG_RPS
|
|
if (static_key_false(&rps_needed)) {
|
|
struct rps_dev_flow voidflow, *rflow = &voidflow;
|
|
int cpu, ret;
|
|
|
|
rcu_read_lock();
|
|
|
|
cpu = get_rps_cpu(skb->dev, skb, &rflow);
|
|
|
|
if (cpu >= 0) {
|
|
ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
#endif
|
|
return __netif_receive_skb(skb);
|
|
}
|
|
|
|
/**
|
|
* netif_receive_skb - process receive buffer from network
|
|
* @skb: buffer to process
|
|
*
|
|
* netif_receive_skb() is the main receive data processing function.
|
|
* It always succeeds. The buffer may be dropped during processing
|
|
* for congestion control or by the protocol layers.
|
|
*
|
|
* This function may only be called from softirq context and interrupts
|
|
* should be enabled.
|
|
*
|
|
* Return values (usually ignored):
|
|
* NET_RX_SUCCESS: no congestion
|
|
* NET_RX_DROP: packet was dropped
|
|
*/
|
|
int netif_receive_skb(struct sk_buff *skb)
|
|
{
|
|
trace_netif_receive_skb_entry(skb);
|
|
|
|
return netif_receive_skb_internal(skb);
|
|
}
|
|
EXPORT_SYMBOL(netif_receive_skb);
|
|
|
|
/* Network device is going away, flush any packets still pending
|
|
* Called with irqs disabled.
|
|
*/
|
|
static void flush_backlog(void *arg)
|
|
{
|
|
struct net_device *dev = arg;
|
|
struct softnet_data *sd = &__get_cpu_var(softnet_data);
|
|
struct sk_buff *skb, *tmp;
|
|
|
|
rps_lock(sd);
|
|
skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
|
|
if (skb->dev == dev) {
|
|
__skb_unlink(skb, &sd->input_pkt_queue);
|
|
kfree_skb(skb);
|
|
input_queue_head_incr(sd);
|
|
}
|
|
}
|
|
rps_unlock(sd);
|
|
|
|
skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
|
|
if (skb->dev == dev) {
|
|
__skb_unlink(skb, &sd->process_queue);
|
|
kfree_skb(skb);
|
|
input_queue_head_incr(sd);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int napi_gro_complete(struct sk_buff *skb)
|
|
{
|
|
struct packet_offload *ptype;
|
|
__be16 type = skb->protocol;
|
|
struct list_head *head = &offload_base;
|
|
int err = -ENOENT;
|
|
|
|
BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
|
|
|
|
if (NAPI_GRO_CB(skb)->count == 1) {
|
|
skb_shinfo(skb)->gso_size = 0;
|
|
goto out;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ptype, head, list) {
|
|
if (ptype->type != type || !ptype->callbacks.gro_complete)
|
|
continue;
|
|
|
|
err = ptype->callbacks.gro_complete(skb, 0);
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (err) {
|
|
WARN_ON(&ptype->list == head);
|
|
kfree_skb(skb);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
out:
|
|
return netif_receive_skb_internal(skb);
|
|
}
|
|
|
|
/* napi->gro_list contains packets ordered by age.
|
|
* youngest packets at the head of it.
|
|
* Complete skbs in reverse order to reduce latencies.
|
|
*/
|
|
void napi_gro_flush(struct napi_struct *napi, bool flush_old)
|
|
{
|
|
struct sk_buff *skb, *prev = NULL;
|
|
|
|
/* scan list and build reverse chain */
|
|
for (skb = napi->gro_list; skb != NULL; skb = skb->next) {
|
|
skb->prev = prev;
|
|
prev = skb;
|
|
}
|
|
|
|
for (skb = prev; skb; skb = prev) {
|
|
skb->next = NULL;
|
|
|
|
if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
|
|
return;
|
|
|
|
prev = skb->prev;
|
|
napi_gro_complete(skb);
|
|
napi->gro_count--;
|
|
}
|
|
|
|
napi->gro_list = NULL;
|
|
}
|
|
EXPORT_SYMBOL(napi_gro_flush);
|
|
|
|
static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *p;
|
|
unsigned int maclen = skb->dev->hard_header_len;
|
|
u32 hash = skb_get_hash_raw(skb);
|
|
|
|
for (p = napi->gro_list; p; p = p->next) {
|
|
unsigned long diffs;
|
|
|
|
NAPI_GRO_CB(p)->flush = 0;
|
|
|
|
if (hash != skb_get_hash_raw(p)) {
|
|
NAPI_GRO_CB(p)->same_flow = 0;
|
|
continue;
|
|
}
|
|
|
|
diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
|
|
diffs |= p->vlan_tci ^ skb->vlan_tci;
|
|
if (maclen == ETH_HLEN)
|
|
diffs |= compare_ether_header(skb_mac_header(p),
|
|
skb_gro_mac_header(skb));
|
|
else if (!diffs)
|
|
diffs = memcmp(skb_mac_header(p),
|
|
skb_gro_mac_header(skb),
|
|
maclen);
|
|
NAPI_GRO_CB(p)->same_flow = !diffs;
|
|
}
|
|
}
|
|
|
|
static void skb_gro_reset_offset(struct sk_buff *skb)
|
|
{
|
|
const struct skb_shared_info *pinfo = skb_shinfo(skb);
|
|
const skb_frag_t *frag0 = &pinfo->frags[0];
|
|
|
|
NAPI_GRO_CB(skb)->data_offset = 0;
|
|
NAPI_GRO_CB(skb)->frag0 = NULL;
|
|
NAPI_GRO_CB(skb)->frag0_len = 0;
|
|
|
|
if (skb_mac_header(skb) == skb_tail_pointer(skb) &&
|
|
pinfo->nr_frags &&
|
|
!PageHighMem(skb_frag_page(frag0))) {
|
|
NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
|
|
NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0);
|
|
}
|
|
}
|
|
|
|
static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff **pp = NULL;
|
|
struct packet_offload *ptype;
|
|
__be16 type = skb->protocol;
|
|
struct list_head *head = &offload_base;
|
|
int same_flow;
|
|
enum gro_result ret;
|
|
|
|
if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
|
|
goto normal;
|
|
|
|
if (skb_is_gso(skb) || skb_has_frag_list(skb))
|
|
goto normal;
|
|
|
|
skb_gro_reset_offset(skb);
|
|
gro_list_prepare(napi, skb);
|
|
NAPI_GRO_CB(skb)->csum = skb->csum; /* Needed for CHECKSUM_COMPLETE */
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ptype, head, list) {
|
|
if (ptype->type != type || !ptype->callbacks.gro_receive)
|
|
continue;
|
|
|
|
skb_set_network_header(skb, skb_gro_offset(skb));
|
|
skb_reset_mac_len(skb);
|
|
NAPI_GRO_CB(skb)->same_flow = 0;
|
|
NAPI_GRO_CB(skb)->flush = 0;
|
|
NAPI_GRO_CB(skb)->free = 0;
|
|
NAPI_GRO_CB(skb)->udp_mark = 0;
|
|
|
|
pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (&ptype->list == head)
|
|
goto normal;
|
|
|
|
same_flow = NAPI_GRO_CB(skb)->same_flow;
|
|
ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
|
|
|
|
if (pp) {
|
|
struct sk_buff *nskb = *pp;
|
|
|
|
*pp = nskb->next;
|
|
nskb->next = NULL;
|
|
napi_gro_complete(nskb);
|
|
napi->gro_count--;
|
|
}
|
|
|
|
if (same_flow)
|
|
goto ok;
|
|
|
|
if (NAPI_GRO_CB(skb)->flush)
|
|
goto normal;
|
|
|
|
if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) {
|
|
struct sk_buff *nskb = napi->gro_list;
|
|
|
|
/* locate the end of the list to select the 'oldest' flow */
|
|
while (nskb->next) {
|
|
pp = &nskb->next;
|
|
nskb = *pp;
|
|
}
|
|
*pp = NULL;
|
|
nskb->next = NULL;
|
|
napi_gro_complete(nskb);
|
|
} else {
|
|
napi->gro_count++;
|
|
}
|
|
NAPI_GRO_CB(skb)->count = 1;
|
|
NAPI_GRO_CB(skb)->age = jiffies;
|
|
skb_shinfo(skb)->gso_size = skb_gro_len(skb);
|
|
skb->next = napi->gro_list;
|
|
napi->gro_list = skb;
|
|
ret = GRO_HELD;
|
|
|
|
pull:
|
|
if (skb_headlen(skb) < skb_gro_offset(skb)) {
|
|
int grow = skb_gro_offset(skb) - skb_headlen(skb);
|
|
|
|
BUG_ON(skb->end - skb->tail < grow);
|
|
|
|
memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
|
|
|
|
skb->tail += grow;
|
|
skb->data_len -= grow;
|
|
|
|
skb_shinfo(skb)->frags[0].page_offset += grow;
|
|
skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
|
|
|
|
if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
|
|
skb_frag_unref(skb, 0);
|
|
memmove(skb_shinfo(skb)->frags,
|
|
skb_shinfo(skb)->frags + 1,
|
|
--skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
|
|
}
|
|
}
|
|
|
|
ok:
|
|
return ret;
|
|
|
|
normal:
|
|
ret = GRO_NORMAL;
|
|
goto pull;
|
|
}
|
|
|
|
struct packet_offload *gro_find_receive_by_type(__be16 type)
|
|
{
|
|
struct list_head *offload_head = &offload_base;
|
|
struct packet_offload *ptype;
|
|
|
|
list_for_each_entry_rcu(ptype, offload_head, list) {
|
|
if (ptype->type != type || !ptype->callbacks.gro_receive)
|
|
continue;
|
|
return ptype;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(gro_find_receive_by_type);
|
|
|
|
struct packet_offload *gro_find_complete_by_type(__be16 type)
|
|
{
|
|
struct list_head *offload_head = &offload_base;
|
|
struct packet_offload *ptype;
|
|
|
|
list_for_each_entry_rcu(ptype, offload_head, list) {
|
|
if (ptype->type != type || !ptype->callbacks.gro_complete)
|
|
continue;
|
|
return ptype;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(gro_find_complete_by_type);
|
|
|
|
static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
|
|
{
|
|
switch (ret) {
|
|
case GRO_NORMAL:
|
|
if (netif_receive_skb_internal(skb))
|
|
ret = GRO_DROP;
|
|
break;
|
|
|
|
case GRO_DROP:
|
|
kfree_skb(skb);
|
|
break;
|
|
|
|
case GRO_MERGED_FREE:
|
|
if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
|
|
kmem_cache_free(skbuff_head_cache, skb);
|
|
else
|
|
__kfree_skb(skb);
|
|
break;
|
|
|
|
case GRO_HELD:
|
|
case GRO_MERGED:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
|
|
{
|
|
trace_napi_gro_receive_entry(skb);
|
|
|
|
return napi_skb_finish(dev_gro_receive(napi, skb), skb);
|
|
}
|
|
EXPORT_SYMBOL(napi_gro_receive);
|
|
|
|
static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
|
|
{
|
|
__skb_pull(skb, skb_headlen(skb));
|
|
/* restore the reserve we had after netdev_alloc_skb_ip_align() */
|
|
skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
|
|
skb->vlan_tci = 0;
|
|
skb->dev = napi->dev;
|
|
skb->skb_iif = 0;
|
|
|
|
napi->skb = skb;
|
|
}
|
|
|
|
struct sk_buff *napi_get_frags(struct napi_struct *napi)
|
|
{
|
|
struct sk_buff *skb = napi->skb;
|
|
|
|
if (!skb) {
|
|
skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
|
|
napi->skb = skb;
|
|
}
|
|
return skb;
|
|
}
|
|
EXPORT_SYMBOL(napi_get_frags);
|
|
|
|
static gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
|
|
gro_result_t ret)
|
|
{
|
|
switch (ret) {
|
|
case GRO_NORMAL:
|
|
if (netif_receive_skb_internal(skb))
|
|
ret = GRO_DROP;
|
|
break;
|
|
|
|
case GRO_DROP:
|
|
case GRO_MERGED_FREE:
|
|
napi_reuse_skb(napi, skb);
|
|
break;
|
|
|
|
case GRO_HELD:
|
|
case GRO_MERGED:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
|
|
{
|
|
struct sk_buff *skb = napi->skb;
|
|
|
|
napi->skb = NULL;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) {
|
|
napi_reuse_skb(napi, skb);
|
|
return NULL;
|
|
}
|
|
skb->protocol = eth_type_trans(skb, skb->dev);
|
|
|
|
return skb;
|
|
}
|
|
|
|
gro_result_t napi_gro_frags(struct napi_struct *napi)
|
|
{
|
|
struct sk_buff *skb = napi_frags_skb(napi);
|
|
|
|
if (!skb)
|
|
return GRO_DROP;
|
|
|
|
trace_napi_gro_frags_entry(skb);
|
|
|
|
return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
|
|
}
|
|
EXPORT_SYMBOL(napi_gro_frags);
|
|
|
|
/*
|
|
* net_rps_action_and_irq_enable sends any pending IPI's for rps.
|
|
* Note: called with local irq disabled, but exits with local irq enabled.
|
|
*/
|
|
static void net_rps_action_and_irq_enable(struct softnet_data *sd)
|
|
{
|
|
#ifdef CONFIG_RPS
|
|
struct softnet_data *remsd = sd->rps_ipi_list;
|
|
|
|
if (remsd) {
|
|
sd->rps_ipi_list = NULL;
|
|
|
|
local_irq_enable();
|
|
|
|
/* Send pending IPI's to kick RPS processing on remote cpus. */
|
|
while (remsd) {
|
|
struct softnet_data *next = remsd->rps_ipi_next;
|
|
|
|
if (cpu_online(remsd->cpu))
|
|
__smp_call_function_single(remsd->cpu,
|
|
&remsd->csd, 0);
|
|
remsd = next;
|
|
}
|
|
} else
|
|
#endif
|
|
local_irq_enable();
|
|
}
|
|
|
|
static int process_backlog(struct napi_struct *napi, int quota)
|
|
{
|
|
int work = 0;
|
|
struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
|
|
|
|
#ifdef CONFIG_RPS
|
|
/* Check if we have pending ipi, its better to send them now,
|
|
* not waiting net_rx_action() end.
|
|
*/
|
|
if (sd->rps_ipi_list) {
|
|
local_irq_disable();
|
|
net_rps_action_and_irq_enable(sd);
|
|
}
|
|
#endif
|
|
napi->weight = weight_p;
|
|
local_irq_disable();
|
|
while (work < quota) {
|
|
struct sk_buff *skb;
|
|
unsigned int qlen;
|
|
|
|
while ((skb = __skb_dequeue(&sd->process_queue))) {
|
|
local_irq_enable();
|
|
__netif_receive_skb(skb);
|
|
local_irq_disable();
|
|
input_queue_head_incr(sd);
|
|
if (++work >= quota) {
|
|
local_irq_enable();
|
|
return work;
|
|
}
|
|
}
|
|
|
|
rps_lock(sd);
|
|
qlen = skb_queue_len(&sd->input_pkt_queue);
|
|
if (qlen)
|
|
skb_queue_splice_tail_init(&sd->input_pkt_queue,
|
|
&sd->process_queue);
|
|
|
|
if (qlen < quota - work) {
|
|
/*
|
|
* Inline a custom version of __napi_complete().
|
|
* only current cpu owns and manipulates this napi,
|
|
* and NAPI_STATE_SCHED is the only possible flag set on backlog.
|
|
* we can use a plain write instead of clear_bit(),
|
|
* and we dont need an smp_mb() memory barrier.
|
|
*/
|
|
list_del(&napi->poll_list);
|
|
napi->state = 0;
|
|
|
|
quota = work + qlen;
|
|
}
|
|
rps_unlock(sd);
|
|
}
|
|
local_irq_enable();
|
|
|
|
return work;
|
|
}
|
|
|
|
/**
|
|
* __napi_schedule - schedule for receive
|
|
* @n: entry to schedule
|
|
*
|
|
* The entry's receive function will be scheduled to run
|
|
*/
|
|
void __napi_schedule(struct napi_struct *n)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
____napi_schedule(&__get_cpu_var(softnet_data), n);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(__napi_schedule);
|
|
|
|
void __napi_complete(struct napi_struct *n)
|
|
{
|
|
BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
|
|
BUG_ON(n->gro_list);
|
|
|
|
list_del(&n->poll_list);
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(NAPI_STATE_SCHED, &n->state);
|
|
}
|
|
EXPORT_SYMBOL(__napi_complete);
|
|
|
|
void napi_complete(struct napi_struct *n)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* don't let napi dequeue from the cpu poll list
|
|
* just in case its running on a different cpu
|
|
*/
|
|
if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
|
|
return;
|
|
|
|
napi_gro_flush(n, false);
|
|
local_irq_save(flags);
|
|
__napi_complete(n);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(napi_complete);
|
|
|
|
/* must be called under rcu_read_lock(), as we dont take a reference */
|
|
struct napi_struct *napi_by_id(unsigned int napi_id)
|
|
{
|
|
unsigned int hash = napi_id % HASH_SIZE(napi_hash);
|
|
struct napi_struct *napi;
|
|
|
|
hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node)
|
|
if (napi->napi_id == napi_id)
|
|
return napi;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(napi_by_id);
|
|
|
|
void napi_hash_add(struct napi_struct *napi)
|
|
{
|
|
if (!test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) {
|
|
|
|
spin_lock(&napi_hash_lock);
|
|
|
|
/* 0 is not a valid id, we also skip an id that is taken
|
|
* we expect both events to be extremely rare
|
|
*/
|
|
napi->napi_id = 0;
|
|
while (!napi->napi_id) {
|
|
napi->napi_id = ++napi_gen_id;
|
|
if (napi_by_id(napi->napi_id))
|
|
napi->napi_id = 0;
|
|
}
|
|
|
|
hlist_add_head_rcu(&napi->napi_hash_node,
|
|
&napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);
|
|
|
|
spin_unlock(&napi_hash_lock);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(napi_hash_add);
|
|
|
|
/* Warning : caller is responsible to make sure rcu grace period
|
|
* is respected before freeing memory containing @napi
|
|
*/
|
|
void napi_hash_del(struct napi_struct *napi)
|
|
{
|
|
spin_lock(&napi_hash_lock);
|
|
|
|
if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state))
|
|
hlist_del_rcu(&napi->napi_hash_node);
|
|
|
|
spin_unlock(&napi_hash_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(napi_hash_del);
|
|
|
|
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
|
|
int (*poll)(struct napi_struct *, int), int weight)
|
|
{
|
|
INIT_LIST_HEAD(&napi->poll_list);
|
|
napi->gro_count = 0;
|
|
napi->gro_list = NULL;
|
|
napi->skb = NULL;
|
|
napi->poll = poll;
|
|
if (weight > NAPI_POLL_WEIGHT)
|
|
pr_err_once("netif_napi_add() called with weight %d on device %s\n",
|
|
weight, dev->name);
|
|
napi->weight = weight;
|
|
list_add(&napi->dev_list, &dev->napi_list);
|
|
napi->dev = dev;
|
|
#ifdef CONFIG_NETPOLL
|
|
spin_lock_init(&napi->poll_lock);
|
|
napi->poll_owner = -1;
|
|
#endif
|
|
set_bit(NAPI_STATE_SCHED, &napi->state);
|
|
}
|
|
EXPORT_SYMBOL(netif_napi_add);
|
|
|
|
void netif_napi_del(struct napi_struct *napi)
|
|
{
|
|
list_del_init(&napi->dev_list);
|
|
napi_free_frags(napi);
|
|
|
|
kfree_skb_list(napi->gro_list);
|
|
napi->gro_list = NULL;
|
|
napi->gro_count = 0;
|
|
}
|
|
EXPORT_SYMBOL(netif_napi_del);
|
|
|
|
static void net_rx_action(struct softirq_action *h)
|
|
{
|
|
struct softnet_data *sd = &__get_cpu_var(softnet_data);
|
|
unsigned long time_limit = jiffies + 2;
|
|
int budget = netdev_budget;
|
|
void *have;
|
|
|
|
local_irq_disable();
|
|
|
|
while (!list_empty(&sd->poll_list)) {
|
|
struct napi_struct *n;
|
|
int work, weight;
|
|
|
|
/* If softirq window is exhuasted then punt.
|
|
* Allow this to run for 2 jiffies since which will allow
|
|
* an average latency of 1.5/HZ.
|
|
*/
|
|
if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit)))
|
|
goto softnet_break;
|
|
|
|
local_irq_enable();
|
|
|
|
/* Even though interrupts have been re-enabled, this
|
|
* access is safe because interrupts can only add new
|
|
* entries to the tail of this list, and only ->poll()
|
|
* calls can remove this head entry from the list.
|
|
*/
|
|
n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
|
|
|
|
have = netpoll_poll_lock(n);
|
|
|
|
weight = n->weight;
|
|
|
|
/* This NAPI_STATE_SCHED test is for avoiding a race
|
|
* with netpoll's poll_napi(). Only the entity which
|
|
* obtains the lock and sees NAPI_STATE_SCHED set will
|
|
* actually make the ->poll() call. Therefore we avoid
|
|
* accidentally calling ->poll() when NAPI is not scheduled.
|
|
*/
|
|
work = 0;
|
|
if (test_bit(NAPI_STATE_SCHED, &n->state)) {
|
|
work = n->poll(n, weight);
|
|
trace_napi_poll(n);
|
|
}
|
|
|
|
WARN_ON_ONCE(work > weight);
|
|
|
|
budget -= work;
|
|
|
|
local_irq_disable();
|
|
|
|
/* Drivers must not modify the NAPI state if they
|
|
* consume the entire weight. In such cases this code
|
|
* still "owns" the NAPI instance and therefore can
|
|
* move the instance around on the list at-will.
|
|
*/
|
|
if (unlikely(work == weight)) {
|
|
if (unlikely(napi_disable_pending(n))) {
|
|
local_irq_enable();
|
|
napi_complete(n);
|
|
local_irq_disable();
|
|
} else {
|
|
if (n->gro_list) {
|
|
/* flush too old packets
|
|
* If HZ < 1000, flush all packets.
|
|
*/
|
|
local_irq_enable();
|
|
napi_gro_flush(n, HZ >= 1000);
|
|
local_irq_disable();
|
|
}
|
|
list_move_tail(&n->poll_list, &sd->poll_list);
|
|
}
|
|
}
|
|
|
|
netpoll_poll_unlock(have);
|
|
}
|
|
out:
|
|
net_rps_action_and_irq_enable(sd);
|
|
|
|
#ifdef CONFIG_NET_DMA
|
|
/*
|
|
* There may not be any more sk_buffs coming right now, so push
|
|
* any pending DMA copies to hardware
|
|
*/
|
|
dma_issue_pending_all();
|
|
#endif
|
|
|
|
return;
|
|
|
|
softnet_break:
|
|
sd->time_squeeze++;
|
|
__raise_softirq_irqoff(NET_RX_SOFTIRQ);
|
|
goto out;
|
|
}
|
|
|
|
struct netdev_adjacent {
|
|
struct net_device *dev;
|
|
|
|
/* upper master flag, there can only be one master device per list */
|
|
bool master;
|
|
|
|
/* counter for the number of times this device was added to us */
|
|
u16 ref_nr;
|
|
|
|
/* private field for the users */
|
|
void *private;
|
|
|
|
struct list_head list;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev,
|
|
struct net_device *adj_dev,
|
|
struct list_head *adj_list)
|
|
{
|
|
struct netdev_adjacent *adj;
|
|
|
|
list_for_each_entry(adj, adj_list, list) {
|
|
if (adj->dev == adj_dev)
|
|
return adj;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* netdev_has_upper_dev - Check if device is linked to an upper device
|
|
* @dev: device
|
|
* @upper_dev: upper device to check
|
|
*
|
|
* Find out if a device is linked to specified upper device and return true
|
|
* in case it is. Note that this checks only immediate upper device,
|
|
* not through a complete stack of devices. The caller must hold the RTNL lock.
|
|
*/
|
|
bool netdev_has_upper_dev(struct net_device *dev,
|
|
struct net_device *upper_dev)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
return __netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper);
|
|
}
|
|
EXPORT_SYMBOL(netdev_has_upper_dev);
|
|
|
|
/**
|
|
* netdev_has_any_upper_dev - Check if device is linked to some device
|
|
* @dev: device
|
|
*
|
|
* Find out if a device is linked to an upper device and return true in case
|
|
* it is. The caller must hold the RTNL lock.
|
|
*/
|
|
static bool netdev_has_any_upper_dev(struct net_device *dev)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
return !list_empty(&dev->all_adj_list.upper);
|
|
}
|
|
|
|
/**
|
|
* netdev_master_upper_dev_get - Get master upper device
|
|
* @dev: device
|
|
*
|
|
* Find a master upper device and return pointer to it or NULL in case
|
|
* it's not there. The caller must hold the RTNL lock.
|
|
*/
|
|
struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
|
|
{
|
|
struct netdev_adjacent *upper;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (list_empty(&dev->adj_list.upper))
|
|
return NULL;
|
|
|
|
upper = list_first_entry(&dev->adj_list.upper,
|
|
struct netdev_adjacent, list);
|
|
if (likely(upper->master))
|
|
return upper->dev;
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(netdev_master_upper_dev_get);
|
|
|
|
void *netdev_adjacent_get_private(struct list_head *adj_list)
|
|
{
|
|
struct netdev_adjacent *adj;
|
|
|
|
adj = list_entry(adj_list, struct netdev_adjacent, list);
|
|
|
|
return adj->private;
|
|
}
|
|
EXPORT_SYMBOL(netdev_adjacent_get_private);
|
|
|
|
/**
|
|
* netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
|
|
* @dev: device
|
|
* @iter: list_head ** of the current position
|
|
*
|
|
* Gets the next device from the dev's upper list, starting from iter
|
|
* position. The caller must hold RCU read lock.
|
|
*/
|
|
struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
|
|
struct list_head **iter)
|
|
{
|
|
struct netdev_adjacent *upper;
|
|
|
|
WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
|
|
|
|
upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
|
|
|
|
if (&upper->list == &dev->all_adj_list.upper)
|
|
return NULL;
|
|
|
|
*iter = &upper->list;
|
|
|
|
return upper->dev;
|
|
}
|
|
EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu);
|
|
|
|
/**
|
|
* netdev_lower_get_next_private - Get the next ->private from the
|
|
* lower neighbour list
|
|
* @dev: device
|
|
* @iter: list_head ** of the current position
|
|
*
|
|
* Gets the next netdev_adjacent->private from the dev's lower neighbour
|
|
* list, starting from iter position. The caller must hold either hold the
|
|
* RTNL lock or its own locking that guarantees that the neighbour lower
|
|
* list will remain unchainged.
|
|
*/
|
|
void *netdev_lower_get_next_private(struct net_device *dev,
|
|
struct list_head **iter)
|
|
{
|
|
struct netdev_adjacent *lower;
|
|
|
|
lower = list_entry(*iter, struct netdev_adjacent, list);
|
|
|
|
if (&lower->list == &dev->adj_list.lower)
|
|
return NULL;
|
|
|
|
if (iter)
|
|
*iter = lower->list.next;
|
|
|
|
return lower->private;
|
|
}
|
|
EXPORT_SYMBOL(netdev_lower_get_next_private);
|
|
|
|
/**
|
|
* netdev_lower_get_next_private_rcu - Get the next ->private from the
|
|
* lower neighbour list, RCU
|
|
* variant
|
|
* @dev: device
|
|
* @iter: list_head ** of the current position
|
|
*
|
|
* Gets the next netdev_adjacent->private from the dev's lower neighbour
|
|
* list, starting from iter position. The caller must hold RCU read lock.
|
|
*/
|
|
void *netdev_lower_get_next_private_rcu(struct net_device *dev,
|
|
struct list_head **iter)
|
|
{
|
|
struct netdev_adjacent *lower;
|
|
|
|
WARN_ON_ONCE(!rcu_read_lock_held());
|
|
|
|
lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
|
|
|
|
if (&lower->list == &dev->adj_list.lower)
|
|
return NULL;
|
|
|
|
if (iter)
|
|
*iter = &lower->list;
|
|
|
|
return lower->private;
|
|
}
|
|
EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
|
|
|
|
/**
|
|
* netdev_lower_get_first_private_rcu - Get the first ->private from the
|
|
* lower neighbour list, RCU
|
|
* variant
|
|
* @dev: device
|
|
*
|
|
* Gets the first netdev_adjacent->private from the dev's lower neighbour
|
|
* list. The caller must hold RCU read lock.
|
|
*/
|
|
void *netdev_lower_get_first_private_rcu(struct net_device *dev)
|
|
{
|
|
struct netdev_adjacent *lower;
|
|
|
|
lower = list_first_or_null_rcu(&dev->adj_list.lower,
|
|
struct netdev_adjacent, list);
|
|
if (lower)
|
|
return lower->private;
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
|
|
|
|
/**
|
|
* netdev_master_upper_dev_get_rcu - Get master upper device
|
|
* @dev: device
|
|
*
|
|
* Find a master upper device and return pointer to it or NULL in case
|
|
* it's not there. The caller must hold the RCU read lock.
|
|
*/
|
|
struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
|
|
{
|
|
struct netdev_adjacent *upper;
|
|
|
|
upper = list_first_or_null_rcu(&dev->adj_list.upper,
|
|
struct netdev_adjacent, list);
|
|
if (upper && likely(upper->master))
|
|
return upper->dev;
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
|
|
|
|
static int netdev_adjacent_sysfs_add(struct net_device *dev,
|
|
struct net_device *adj_dev,
|
|
struct list_head *dev_list)
|
|
{
|
|
char linkname[IFNAMSIZ+7];
|
|
sprintf(linkname, dev_list == &dev->adj_list.upper ?
|
|
"upper_%s" : "lower_%s", adj_dev->name);
|
|
return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
|
|
linkname);
|
|
}
|
|
static void netdev_adjacent_sysfs_del(struct net_device *dev,
|
|
char *name,
|
|
struct list_head *dev_list)
|
|
{
|
|
char linkname[IFNAMSIZ+7];
|
|
sprintf(linkname, dev_list == &dev->adj_list.upper ?
|
|
"upper_%s" : "lower_%s", name);
|
|
sysfs_remove_link(&(dev->dev.kobj), linkname);
|
|
}
|
|
|
|
#define netdev_adjacent_is_neigh_list(dev, dev_list) \
|
|
(dev_list == &dev->adj_list.upper || \
|
|
dev_list == &dev->adj_list.lower)
|
|
|
|
static int __netdev_adjacent_dev_insert(struct net_device *dev,
|
|
struct net_device *adj_dev,
|
|
struct list_head *dev_list,
|
|
void *private, bool master)
|
|
{
|
|
struct netdev_adjacent *adj;
|
|
int ret;
|
|
|
|
adj = __netdev_find_adj(dev, adj_dev, dev_list);
|
|
|
|
if (adj) {
|
|
adj->ref_nr++;
|
|
return 0;
|
|
}
|
|
|
|
adj = kmalloc(sizeof(*adj), GFP_KERNEL);
|
|
if (!adj)
|
|
return -ENOMEM;
|
|
|
|
adj->dev = adj_dev;
|
|
adj->master = master;
|
|
adj->ref_nr = 1;
|
|
adj->private = private;
|
|
dev_hold(adj_dev);
|
|
|
|
pr_debug("dev_hold for %s, because of link added from %s to %s\n",
|
|
adj_dev->name, dev->name, adj_dev->name);
|
|
|
|
if (netdev_adjacent_is_neigh_list(dev, dev_list)) {
|
|
ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
|
|
if (ret)
|
|
goto free_adj;
|
|
}
|
|
|
|
/* Ensure that master link is always the first item in list. */
|
|
if (master) {
|
|
ret = sysfs_create_link(&(dev->dev.kobj),
|
|
&(adj_dev->dev.kobj), "master");
|
|
if (ret)
|
|
goto remove_symlinks;
|
|
|
|
list_add_rcu(&adj->list, dev_list);
|
|
} else {
|
|
list_add_tail_rcu(&adj->list, dev_list);
|
|
}
|
|
|
|
return 0;
|
|
|
|
remove_symlinks:
|
|
if (netdev_adjacent_is_neigh_list(dev, dev_list))
|
|
netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
|
|
free_adj:
|
|
kfree(adj);
|
|
dev_put(adj_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __netdev_adjacent_dev_remove(struct net_device *dev,
|
|
struct net_device *adj_dev,
|
|
struct list_head *dev_list)
|
|
{
|
|
struct netdev_adjacent *adj;
|
|
|
|
adj = __netdev_find_adj(dev, adj_dev, dev_list);
|
|
|
|
if (!adj) {
|
|
pr_err("tried to remove device %s from %s\n",
|
|
dev->name, adj_dev->name);
|
|
BUG();
|
|
}
|
|
|
|
if (adj->ref_nr > 1) {
|
|
pr_debug("%s to %s ref_nr-- = %d\n", dev->name, adj_dev->name,
|
|
adj->ref_nr-1);
|
|
adj->ref_nr--;
|
|
return;
|
|
}
|
|
|
|
if (adj->master)
|
|
sysfs_remove_link(&(dev->dev.kobj), "master");
|
|
|
|
if (netdev_adjacent_is_neigh_list(dev, dev_list))
|
|
netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
|
|
|
|
list_del_rcu(&adj->list);
|
|
pr_debug("dev_put for %s, because link removed from %s to %s\n",
|
|
adj_dev->name, dev->name, adj_dev->name);
|
|
dev_put(adj_dev);
|
|
kfree_rcu(adj, rcu);
|
|
}
|
|
|
|
static int __netdev_adjacent_dev_link_lists(struct net_device *dev,
|
|
struct net_device *upper_dev,
|
|
struct list_head *up_list,
|
|
struct list_head *down_list,
|
|
void *private, bool master)
|
|
{
|
|
int ret;
|
|
|
|
ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private,
|
|
master);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private,
|
|
false);
|
|
if (ret) {
|
|
__netdev_adjacent_dev_remove(dev, upper_dev, up_list);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __netdev_adjacent_dev_link(struct net_device *dev,
|
|
struct net_device *upper_dev)
|
|
{
|
|
return __netdev_adjacent_dev_link_lists(dev, upper_dev,
|
|
&dev->all_adj_list.upper,
|
|
&upper_dev->all_adj_list.lower,
|
|
NULL, false);
|
|
}
|
|
|
|
static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev,
|
|
struct net_device *upper_dev,
|
|
struct list_head *up_list,
|
|
struct list_head *down_list)
|
|
{
|
|
__netdev_adjacent_dev_remove(dev, upper_dev, up_list);
|
|
__netdev_adjacent_dev_remove(upper_dev, dev, down_list);
|
|
}
|
|
|
|
static void __netdev_adjacent_dev_unlink(struct net_device *dev,
|
|
struct net_device *upper_dev)
|
|
{
|
|
__netdev_adjacent_dev_unlink_lists(dev, upper_dev,
|
|
&dev->all_adj_list.upper,
|
|
&upper_dev->all_adj_list.lower);
|
|
}
|
|
|
|
static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
|
|
struct net_device *upper_dev,
|
|
void *private, bool master)
|
|
{
|
|
int ret = __netdev_adjacent_dev_link(dev, upper_dev);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = __netdev_adjacent_dev_link_lists(dev, upper_dev,
|
|
&dev->adj_list.upper,
|
|
&upper_dev->adj_list.lower,
|
|
private, master);
|
|
if (ret) {
|
|
__netdev_adjacent_dev_unlink(dev, upper_dev);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
|
|
struct net_device *upper_dev)
|
|
{
|
|
__netdev_adjacent_dev_unlink(dev, upper_dev);
|
|
__netdev_adjacent_dev_unlink_lists(dev, upper_dev,
|
|
&dev->adj_list.upper,
|
|
&upper_dev->adj_list.lower);
|
|
}
|
|
|
|
static int __netdev_upper_dev_link(struct net_device *dev,
|
|
struct net_device *upper_dev, bool master,
|
|
void *private)
|
|
{
|
|
struct netdev_adjacent *i, *j, *to_i, *to_j;
|
|
int ret = 0;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (dev == upper_dev)
|
|
return -EBUSY;
|
|
|
|
/* To prevent loops, check if dev is not upper device to upper_dev. */
|
|
if (__netdev_find_adj(upper_dev, dev, &upper_dev->all_adj_list.upper))
|
|
return -EBUSY;
|
|
|
|
if (__netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper))
|
|
return -EEXIST;
|
|
|
|
if (master && netdev_master_upper_dev_get(dev))
|
|
return -EBUSY;
|
|
|
|
ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private,
|
|
master);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Now that we linked these devs, make all the upper_dev's
|
|
* all_adj_list.upper visible to every dev's all_adj_list.lower an
|
|
* versa, and don't forget the devices itself. All of these
|
|
* links are non-neighbours.
|
|
*/
|
|
list_for_each_entry(i, &dev->all_adj_list.lower, list) {
|
|
list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
|
|
pr_debug("Interlinking %s with %s, non-neighbour\n",
|
|
i->dev->name, j->dev->name);
|
|
ret = __netdev_adjacent_dev_link(i->dev, j->dev);
|
|
if (ret)
|
|
goto rollback_mesh;
|
|
}
|
|
}
|
|
|
|
/* add dev to every upper_dev's upper device */
|
|
list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
|
|
pr_debug("linking %s's upper device %s with %s\n",
|
|
upper_dev->name, i->dev->name, dev->name);
|
|
ret = __netdev_adjacent_dev_link(dev, i->dev);
|
|
if (ret)
|
|
goto rollback_upper_mesh;
|
|
}
|
|
|
|
/* add upper_dev to every dev's lower device */
|
|
list_for_each_entry(i, &dev->all_adj_list.lower, list) {
|
|
pr_debug("linking %s's lower device %s with %s\n", dev->name,
|
|
i->dev->name, upper_dev->name);
|
|
ret = __netdev_adjacent_dev_link(i->dev, upper_dev);
|
|
if (ret)
|
|
goto rollback_lower_mesh;
|
|
}
|
|
|
|
call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev);
|
|
return 0;
|
|
|
|
rollback_lower_mesh:
|
|
to_i = i;
|
|
list_for_each_entry(i, &dev->all_adj_list.lower, list) {
|
|
if (i == to_i)
|
|
break;
|
|
__netdev_adjacent_dev_unlink(i->dev, upper_dev);
|
|
}
|
|
|
|
i = NULL;
|
|
|
|
rollback_upper_mesh:
|
|
to_i = i;
|
|
list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
|
|
if (i == to_i)
|
|
break;
|
|
__netdev_adjacent_dev_unlink(dev, i->dev);
|
|
}
|
|
|
|
i = j = NULL;
|
|
|
|
rollback_mesh:
|
|
to_i = i;
|
|
to_j = j;
|
|
list_for_each_entry(i, &dev->all_adj_list.lower, list) {
|
|
list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
|
|
if (i == to_i && j == to_j)
|
|
break;
|
|
__netdev_adjacent_dev_unlink(i->dev, j->dev);
|
|
}
|
|
if (i == to_i)
|
|
break;
|
|
}
|
|
|
|
__netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* netdev_upper_dev_link - Add a link to the upper device
|
|
* @dev: device
|
|
* @upper_dev: new upper device
|
|
*
|
|
* Adds a link to device which is upper to this one. The caller must hold
|
|
* the RTNL lock. On a failure a negative errno code is returned.
|
|
* On success the reference counts are adjusted and the function
|
|
* returns zero.
|
|
*/
|
|
int netdev_upper_dev_link(struct net_device *dev,
|
|
struct net_device *upper_dev)
|
|
{
|
|
return __netdev_upper_dev_link(dev, upper_dev, false, NULL);
|
|
}
|
|
EXPORT_SYMBOL(netdev_upper_dev_link);
|
|
|
|
/**
|
|
* netdev_master_upper_dev_link - Add a master link to the upper device
|
|
* @dev: device
|
|
* @upper_dev: new upper device
|
|
*
|
|
* Adds a link to device which is upper to this one. In this case, only
|
|
* one master upper device can be linked, although other non-master devices
|
|
* might be linked as well. The caller must hold the RTNL lock.
|
|
* On a failure a negative errno code is returned. On success the reference
|
|
* counts are adjusted and the function returns zero.
|
|
*/
|
|
int netdev_master_upper_dev_link(struct net_device *dev,
|
|
struct net_device *upper_dev)
|
|
{
|
|
return __netdev_upper_dev_link(dev, upper_dev, true, NULL);
|
|
}
|
|
EXPORT_SYMBOL(netdev_master_upper_dev_link);
|
|
|
|
int netdev_master_upper_dev_link_private(struct net_device *dev,
|
|
struct net_device *upper_dev,
|
|
void *private)
|
|
{
|
|
return __netdev_upper_dev_link(dev, upper_dev, true, private);
|
|
}
|
|
EXPORT_SYMBOL(netdev_master_upper_dev_link_private);
|
|
|
|
/**
|
|
* netdev_upper_dev_unlink - Removes a link to upper device
|
|
* @dev: device
|
|
* @upper_dev: new upper device
|
|
*
|
|
* Removes a link to device which is upper to this one. The caller must hold
|
|
* the RTNL lock.
|
|
*/
|
|
void netdev_upper_dev_unlink(struct net_device *dev,
|
|
struct net_device *upper_dev)
|
|
{
|
|
struct netdev_adjacent *i, *j;
|
|
ASSERT_RTNL();
|
|
|
|
__netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
|
|
|
|
/* Here is the tricky part. We must remove all dev's lower
|
|
* devices from all upper_dev's upper devices and vice
|
|
* versa, to maintain the graph relationship.
|
|
*/
|
|
list_for_each_entry(i, &dev->all_adj_list.lower, list)
|
|
list_for_each_entry(j, &upper_dev->all_adj_list.upper, list)
|
|
__netdev_adjacent_dev_unlink(i->dev, j->dev);
|
|
|
|
/* remove also the devices itself from lower/upper device
|
|
* list
|
|
*/
|
|
list_for_each_entry(i, &dev->all_adj_list.lower, list)
|
|
__netdev_adjacent_dev_unlink(i->dev, upper_dev);
|
|
|
|
list_for_each_entry(i, &upper_dev->all_adj_list.upper, list)
|
|
__netdev_adjacent_dev_unlink(dev, i->dev);
|
|
|
|
call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev);
|
|
}
|
|
EXPORT_SYMBOL(netdev_upper_dev_unlink);
|
|
|
|
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
|
|
{
|
|
struct netdev_adjacent *iter;
|
|
|
|
list_for_each_entry(iter, &dev->adj_list.upper, list) {
|
|
netdev_adjacent_sysfs_del(iter->dev, oldname,
|
|
&iter->dev->adj_list.lower);
|
|
netdev_adjacent_sysfs_add(iter->dev, dev,
|
|
&iter->dev->adj_list.lower);
|
|
}
|
|
|
|
list_for_each_entry(iter, &dev->adj_list.lower, list) {
|
|
netdev_adjacent_sysfs_del(iter->dev, oldname,
|
|
&iter->dev->adj_list.upper);
|
|
netdev_adjacent_sysfs_add(iter->dev, dev,
|
|
&iter->dev->adj_list.upper);
|
|
}
|
|
}
|
|
|
|
void *netdev_lower_dev_get_private(struct net_device *dev,
|
|
struct net_device *lower_dev)
|
|
{
|
|
struct netdev_adjacent *lower;
|
|
|
|
if (!lower_dev)
|
|
return NULL;
|
|
lower = __netdev_find_adj(dev, lower_dev, &dev->adj_list.lower);
|
|
if (!lower)
|
|
return NULL;
|
|
|
|
return lower->private;
|
|
}
|
|
EXPORT_SYMBOL(netdev_lower_dev_get_private);
|
|
|
|
static void dev_change_rx_flags(struct net_device *dev, int flags)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
if (ops->ndo_change_rx_flags)
|
|
ops->ndo_change_rx_flags(dev, flags);
|
|
}
|
|
|
|
static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
|
|
{
|
|
unsigned int old_flags = dev->flags;
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
dev->flags |= IFF_PROMISC;
|
|
dev->promiscuity += inc;
|
|
if (dev->promiscuity == 0) {
|
|
/*
|
|
* Avoid overflow.
|
|
* If inc causes overflow, untouch promisc and return error.
|
|
*/
|
|
if (inc < 0)
|
|
dev->flags &= ~IFF_PROMISC;
|
|
else {
|
|
dev->promiscuity -= inc;
|
|
pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
|
|
dev->name);
|
|
return -EOVERFLOW;
|
|
}
|
|
}
|
|
if (dev->flags != old_flags) {
|
|
pr_info("device %s %s promiscuous mode\n",
|
|
dev->name,
|
|
dev->flags & IFF_PROMISC ? "entered" : "left");
|
|
if (audit_enabled) {
|
|
current_uid_gid(&uid, &gid);
|
|
audit_log(current->audit_context, GFP_ATOMIC,
|
|
AUDIT_ANOM_PROMISCUOUS,
|
|
"dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
|
|
dev->name, (dev->flags & IFF_PROMISC),
|
|
(old_flags & IFF_PROMISC),
|
|
from_kuid(&init_user_ns, audit_get_loginuid(current)),
|
|
from_kuid(&init_user_ns, uid),
|
|
from_kgid(&init_user_ns, gid),
|
|
audit_get_sessionid(current));
|
|
}
|
|
|
|
dev_change_rx_flags(dev, IFF_PROMISC);
|
|
}
|
|
if (notify)
|
|
__dev_notify_flags(dev, old_flags, IFF_PROMISC);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dev_set_promiscuity - update promiscuity count on a device
|
|
* @dev: device
|
|
* @inc: modifier
|
|
*
|
|
* Add or remove promiscuity from a device. While the count in the device
|
|
* remains above zero the interface remains promiscuous. Once it hits zero
|
|
* the device reverts back to normal filtering operation. A negative inc
|
|
* value is used to drop promiscuity on the device.
|
|
* Return 0 if successful or a negative errno code on error.
|
|
*/
|
|
int dev_set_promiscuity(struct net_device *dev, int inc)
|
|
{
|
|
unsigned int old_flags = dev->flags;
|
|
int err;
|
|
|
|
err = __dev_set_promiscuity(dev, inc, true);
|
|
if (err < 0)
|
|
return err;
|
|
if (dev->flags != old_flags)
|
|
dev_set_rx_mode(dev);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(dev_set_promiscuity);
|
|
|
|
static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify)
|
|
{
|
|
unsigned int old_flags = dev->flags, old_gflags = dev->gflags;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
dev->flags |= IFF_ALLMULTI;
|
|
dev->allmulti += inc;
|
|
if (dev->allmulti == 0) {
|
|
/*
|
|
* Avoid overflow.
|
|
* If inc causes overflow, untouch allmulti and return error.
|
|
*/
|
|
if (inc < 0)
|
|
dev->flags &= ~IFF_ALLMULTI;
|
|
else {
|
|
dev->allmulti -= inc;
|
|
pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
|
|
dev->name);
|
|
return -EOVERFLOW;
|
|
}
|
|
}
|
|
if (dev->flags ^ old_flags) {
|
|
dev_change_rx_flags(dev, IFF_ALLMULTI);
|
|
dev_set_rx_mode(dev);
|
|
if (notify)
|
|
__dev_notify_flags(dev, old_flags,
|
|
dev->gflags ^ old_gflags);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dev_set_allmulti - update allmulti count on a device
|
|
* @dev: device
|
|
* @inc: modifier
|
|
*
|
|
* Add or remove reception of all multicast frames to a device. While the
|
|
* count in the device remains above zero the interface remains listening
|
|
* to all interfaces. Once it hits zero the device reverts back to normal
|
|
* filtering operation. A negative @inc value is used to drop the counter
|
|
* when releasing a resource needing all multicasts.
|
|
* Return 0 if successful or a negative errno code on error.
|
|
*/
|
|
|
|
int dev_set_allmulti(struct net_device *dev, int inc)
|
|
{
|
|
return __dev_set_allmulti(dev, inc, true);
|
|
}
|
|
EXPORT_SYMBOL(dev_set_allmulti);
|
|
|
|
/*
|
|
* Upload unicast and multicast address lists to device and
|
|
* configure RX filtering. When the device doesn't support unicast
|
|
* filtering it is put in promiscuous mode while unicast addresses
|
|
* are present.
|
|
*/
|
|
void __dev_set_rx_mode(struct net_device *dev)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
/* dev_open will call this function so the list will stay sane. */
|
|
if (!(dev->flags&IFF_UP))
|
|
return;
|
|
|
|
if (!netif_device_present(dev))
|
|
return;
|
|
|
|
if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
|
|
/* Unicast addresses changes may only happen under the rtnl,
|
|
* therefore calling __dev_set_promiscuity here is safe.
|
|
*/
|
|
if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
|
|
__dev_set_promiscuity(dev, 1, false);
|
|
dev->uc_promisc = true;
|
|
} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
|
|
__dev_set_promiscuity(dev, -1, false);
|
|
dev->uc_promisc = false;
|
|
}
|
|
}
|
|
|
|
if (ops->ndo_set_rx_mode)
|
|
ops->ndo_set_rx_mode(dev);
|
|
}
|
|
|
|
void dev_set_rx_mode(struct net_device *dev)
|
|
{
|
|
netif_addr_lock_bh(dev);
|
|
__dev_set_rx_mode(dev);
|
|
netif_addr_unlock_bh(dev);
|
|
}
|
|
|
|
/**
|
|
* dev_get_flags - get flags reported to userspace
|
|
* @dev: device
|
|
*
|
|
* Get the combination of flag bits exported through APIs to userspace.
|
|
*/
|
|
unsigned int dev_get_flags(const struct net_device *dev)
|
|
{
|
|
unsigned int flags;
|
|
|
|
flags = (dev->flags & ~(IFF_PROMISC |
|
|
IFF_ALLMULTI |
|
|
IFF_RUNNING |
|
|
IFF_LOWER_UP |
|
|
IFF_DORMANT)) |
|
|
(dev->gflags & (IFF_PROMISC |
|
|
IFF_ALLMULTI));
|
|
|
|
if (netif_running(dev)) {
|
|
if (netif_oper_up(dev))
|
|
flags |= IFF_RUNNING;
|
|
if (netif_carrier_ok(dev))
|
|
flags |= IFF_LOWER_UP;
|
|
if (netif_dormant(dev))
|
|
flags |= IFF_DORMANT;
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_flags);
|
|
|
|
int __dev_change_flags(struct net_device *dev, unsigned int flags)
|
|
{
|
|
unsigned int old_flags = dev->flags;
|
|
int ret;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/*
|
|
* Set the flags on our device.
|
|
*/
|
|
|
|
dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
|
|
IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
|
|
IFF_AUTOMEDIA)) |
|
|
(dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
|
|
IFF_ALLMULTI));
|
|
|
|
/*
|
|
* Load in the correct multicast list now the flags have changed.
|
|
*/
|
|
|
|
if ((old_flags ^ flags) & IFF_MULTICAST)
|
|
dev_change_rx_flags(dev, IFF_MULTICAST);
|
|
|
|
dev_set_rx_mode(dev);
|
|
|
|
/*
|
|
* Have we downed the interface. We handle IFF_UP ourselves
|
|
* according to user attempts to set it, rather than blindly
|
|
* setting it.
|
|
*/
|
|
|
|
ret = 0;
|
|
if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
|
|
ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
|
|
|
|
if (!ret)
|
|
dev_set_rx_mode(dev);
|
|
}
|
|
|
|
if ((flags ^ dev->gflags) & IFF_PROMISC) {
|
|
int inc = (flags & IFF_PROMISC) ? 1 : -1;
|
|
unsigned int old_flags = dev->flags;
|
|
|
|
dev->gflags ^= IFF_PROMISC;
|
|
|
|
if (__dev_set_promiscuity(dev, inc, false) >= 0)
|
|
if (dev->flags != old_flags)
|
|
dev_set_rx_mode(dev);
|
|
}
|
|
|
|
/* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
|
|
is important. Some (broken) drivers set IFF_PROMISC, when
|
|
IFF_ALLMULTI is requested not asking us and not reporting.
|
|
*/
|
|
if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
|
|
int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
|
|
|
|
dev->gflags ^= IFF_ALLMULTI;
|
|
__dev_set_allmulti(dev, inc, false);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
|
|
unsigned int gchanges)
|
|
{
|
|
unsigned int changes = dev->flags ^ old_flags;
|
|
|
|
if (gchanges)
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC);
|
|
|
|
if (changes & IFF_UP) {
|
|
if (dev->flags & IFF_UP)
|
|
call_netdevice_notifiers(NETDEV_UP, dev);
|
|
else
|
|
call_netdevice_notifiers(NETDEV_DOWN, dev);
|
|
}
|
|
|
|
if (dev->flags & IFF_UP &&
|
|
(changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) {
|
|
struct netdev_notifier_change_info change_info;
|
|
|
|
change_info.flags_changed = changes;
|
|
call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
|
|
&change_info.info);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* dev_change_flags - change device settings
|
|
* @dev: device
|
|
* @flags: device state flags
|
|
*
|
|
* Change settings on device based state flags. The flags are
|
|
* in the userspace exported format.
|
|
*/
|
|
int dev_change_flags(struct net_device *dev, unsigned int flags)
|
|
{
|
|
int ret;
|
|
unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
|
|
|
|
ret = __dev_change_flags(dev, flags);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
|
|
__dev_notify_flags(dev, old_flags, changes);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dev_change_flags);
|
|
|
|
static int __dev_set_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
if (ops->ndo_change_mtu)
|
|
return ops->ndo_change_mtu(dev, new_mtu);
|
|
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dev_set_mtu - Change maximum transfer unit
|
|
* @dev: device
|
|
* @new_mtu: new transfer unit
|
|
*
|
|
* Change the maximum transfer size of the network device.
|
|
*/
|
|
int dev_set_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
int err, orig_mtu;
|
|
|
|
if (new_mtu == dev->mtu)
|
|
return 0;
|
|
|
|
/* MTU must be positive. */
|
|
if (new_mtu < 0)
|
|
return -EINVAL;
|
|
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
|
|
err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev);
|
|
err = notifier_to_errno(err);
|
|
if (err)
|
|
return err;
|
|
|
|
orig_mtu = dev->mtu;
|
|
err = __dev_set_mtu(dev, new_mtu);
|
|
|
|
if (!err) {
|
|
err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
|
|
err = notifier_to_errno(err);
|
|
if (err) {
|
|
/* setting mtu back and notifying everyone again,
|
|
* so that they have a chance to revert changes.
|
|
*/
|
|
__dev_set_mtu(dev, orig_mtu);
|
|
call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(dev_set_mtu);
|
|
|
|
/**
|
|
* dev_set_group - Change group this device belongs to
|
|
* @dev: device
|
|
* @new_group: group this device should belong to
|
|
*/
|
|
void dev_set_group(struct net_device *dev, int new_group)
|
|
{
|
|
dev->group = new_group;
|
|
}
|
|
EXPORT_SYMBOL(dev_set_group);
|
|
|
|
/**
|
|
* dev_set_mac_address - Change Media Access Control Address
|
|
* @dev: device
|
|
* @sa: new address
|
|
*
|
|
* Change the hardware (MAC) address of the device
|
|
*/
|
|
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
int err;
|
|
|
|
if (!ops->ndo_set_mac_address)
|
|
return -EOPNOTSUPP;
|
|
if (sa->sa_family != dev->type)
|
|
return -EINVAL;
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
err = ops->ndo_set_mac_address(dev, sa);
|
|
if (err)
|
|
return err;
|
|
dev->addr_assign_type = NET_ADDR_SET;
|
|
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
|
|
add_device_randomness(dev->dev_addr, dev->addr_len);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dev_set_mac_address);
|
|
|
|
/**
|
|
* dev_change_carrier - Change device carrier
|
|
* @dev: device
|
|
* @new_carrier: new value
|
|
*
|
|
* Change device carrier
|
|
*/
|
|
int dev_change_carrier(struct net_device *dev, bool new_carrier)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
if (!ops->ndo_change_carrier)
|
|
return -EOPNOTSUPP;
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
return ops->ndo_change_carrier(dev, new_carrier);
|
|
}
|
|
EXPORT_SYMBOL(dev_change_carrier);
|
|
|
|
/**
|
|
* dev_get_phys_port_id - Get device physical port ID
|
|
* @dev: device
|
|
* @ppid: port ID
|
|
*
|
|
* Get device physical port ID
|
|
*/
|
|
int dev_get_phys_port_id(struct net_device *dev,
|
|
struct netdev_phys_port_id *ppid)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
if (!ops->ndo_get_phys_port_id)
|
|
return -EOPNOTSUPP;
|
|
return ops->ndo_get_phys_port_id(dev, ppid);
|
|
}
|
|
EXPORT_SYMBOL(dev_get_phys_port_id);
|
|
|
|
/**
|
|
* dev_new_index - allocate an ifindex
|
|
* @net: the applicable net namespace
|
|
*
|
|
* Returns a suitable unique value for a new device interface
|
|
* number. The caller must hold the rtnl semaphore or the
|
|
* dev_base_lock to be sure it remains unique.
|
|
*/
|
|
static int dev_new_index(struct net *net)
|
|
{
|
|
int ifindex = net->ifindex;
|
|
for (;;) {
|
|
if (++ifindex <= 0)
|
|
ifindex = 1;
|
|
if (!__dev_get_by_index(net, ifindex))
|
|
return net->ifindex = ifindex;
|
|
}
|
|
}
|
|
|
|
/* Delayed registration/unregisteration */
|
|
static LIST_HEAD(net_todo_list);
|
|
static DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
|
|
|
|
static void net_set_todo(struct net_device *dev)
|
|
{
|
|
list_add_tail(&dev->todo_list, &net_todo_list);
|
|
dev_net(dev)->dev_unreg_count++;
|
|
}
|
|
|
|
static void rollback_registered_many(struct list_head *head)
|
|
{
|
|
struct net_device *dev, *tmp;
|
|
LIST_HEAD(close_head);
|
|
|
|
BUG_ON(dev_boot_phase);
|
|
ASSERT_RTNL();
|
|
|
|
list_for_each_entry_safe(dev, tmp, head, unreg_list) {
|
|
/* Some devices call without registering
|
|
* for initialization unwind. Remove those
|
|
* devices and proceed with the remaining.
|
|
*/
|
|
if (dev->reg_state == NETREG_UNINITIALIZED) {
|
|
pr_debug("unregister_netdevice: device %s/%p never was registered\n",
|
|
dev->name, dev);
|
|
|
|
WARN_ON(1);
|
|
list_del(&dev->unreg_list);
|
|
continue;
|
|
}
|
|
dev->dismantle = true;
|
|
BUG_ON(dev->reg_state != NETREG_REGISTERED);
|
|
}
|
|
|
|
/* If device is running, close it first. */
|
|
list_for_each_entry(dev, head, unreg_list)
|
|
list_add_tail(&dev->close_list, &close_head);
|
|
dev_close_many(&close_head);
|
|
|
|
list_for_each_entry(dev, head, unreg_list) {
|
|
/* And unlink it from device chain. */
|
|
unlist_netdevice(dev);
|
|
|
|
dev->reg_state = NETREG_UNREGISTERING;
|
|
}
|
|
|
|
synchronize_net();
|
|
|
|
list_for_each_entry(dev, head, unreg_list) {
|
|
/* Shutdown queueing discipline. */
|
|
dev_shutdown(dev);
|
|
|
|
|
|
/* Notify protocols, that we are about to destroy
|
|
this device. They should clean all the things.
|
|
*/
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
|
|
|
|
if (!dev->rtnl_link_ops ||
|
|
dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
|
|
rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL);
|
|
|
|
/*
|
|
* Flush the unicast and multicast chains
|
|
*/
|
|
dev_uc_flush(dev);
|
|
dev_mc_flush(dev);
|
|
|
|
if (dev->netdev_ops->ndo_uninit)
|
|
dev->netdev_ops->ndo_uninit(dev);
|
|
|
|
/* Notifier chain MUST detach us all upper devices. */
|
|
WARN_ON(netdev_has_any_upper_dev(dev));
|
|
|
|
/* Remove entries from kobject tree */
|
|
netdev_unregister_kobject(dev);
|
|
#ifdef CONFIG_XPS
|
|
/* Remove XPS queueing entries */
|
|
netif_reset_xps_queues_gt(dev, 0);
|
|
#endif
|
|
}
|
|
|
|
synchronize_net();
|
|
|
|
list_for_each_entry(dev, head, unreg_list)
|
|
dev_put(dev);
|
|
}
|
|
|
|
static void rollback_registered(struct net_device *dev)
|
|
{
|
|
LIST_HEAD(single);
|
|
|
|
list_add(&dev->unreg_list, &single);
|
|
rollback_registered_many(&single);
|
|
list_del(&single);
|
|
}
|
|
|
|
static netdev_features_t netdev_fix_features(struct net_device *dev,
|
|
netdev_features_t features)
|
|
{
|
|
/* Fix illegal checksum combinations */
|
|
if ((features & NETIF_F_HW_CSUM) &&
|
|
(features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
|
|
netdev_warn(dev, "mixed HW and IP checksum settings.\n");
|
|
features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
|
|
}
|
|
|
|
/* TSO requires that SG is present as well. */
|
|
if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
|
|
netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
|
|
features &= ~NETIF_F_ALL_TSO;
|
|
}
|
|
|
|
if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
|
|
!(features & NETIF_F_IP_CSUM)) {
|
|
netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
|
|
features &= ~NETIF_F_TSO;
|
|
features &= ~NETIF_F_TSO_ECN;
|
|
}
|
|
|
|
if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) &&
|
|
!(features & NETIF_F_IPV6_CSUM)) {
|
|
netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n");
|
|
features &= ~NETIF_F_TSO6;
|
|
}
|
|
|
|
/* TSO ECN requires that TSO is present as well. */
|
|
if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
|
|
features &= ~NETIF_F_TSO_ECN;
|
|
|
|
/* Software GSO depends on SG. */
|
|
if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
|
|
netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
|
|
features &= ~NETIF_F_GSO;
|
|
}
|
|
|
|
/* UFO needs SG and checksumming */
|
|
if (features & NETIF_F_UFO) {
|
|
/* maybe split UFO into V4 and V6? */
|
|
if (!((features & NETIF_F_GEN_CSUM) ||
|
|
(features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
|
|
== (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
|
|
netdev_dbg(dev,
|
|
"Dropping NETIF_F_UFO since no checksum offload features.\n");
|
|
features &= ~NETIF_F_UFO;
|
|
}
|
|
|
|
if (!(features & NETIF_F_SG)) {
|
|
netdev_dbg(dev,
|
|
"Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
|
|
features &= ~NETIF_F_UFO;
|
|
}
|
|
}
|
|
|
|
return features;
|
|
}
|
|
|
|
int __netdev_update_features(struct net_device *dev)
|
|
{
|
|
netdev_features_t features;
|
|
int err = 0;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
features = netdev_get_wanted_features(dev);
|
|
|
|
if (dev->netdev_ops->ndo_fix_features)
|
|
features = dev->netdev_ops->ndo_fix_features(dev, features);
|
|
|
|
/* driver might be less strict about feature dependencies */
|
|
features = netdev_fix_features(dev, features);
|
|
|
|
if (dev->features == features)
|
|
return 0;
|
|
|
|
netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
|
|
&dev->features, &features);
|
|
|
|
if (dev->netdev_ops->ndo_set_features)
|
|
err = dev->netdev_ops->ndo_set_features(dev, features);
|
|
|
|
if (unlikely(err < 0)) {
|
|
netdev_err(dev,
|
|
"set_features() failed (%d); wanted %pNF, left %pNF\n",
|
|
err, &features, &dev->features);
|
|
return -1;
|
|
}
|
|
|
|
if (!err)
|
|
dev->features = features;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* netdev_update_features - recalculate device features
|
|
* @dev: the device to check
|
|
*
|
|
* Recalculate dev->features set and send notifications if it
|
|
* has changed. Should be called after driver or hardware dependent
|
|
* conditions might have changed that influence the features.
|
|
*/
|
|
void netdev_update_features(struct net_device *dev)
|
|
{
|
|
if (__netdev_update_features(dev))
|
|
netdev_features_change(dev);
|
|
}
|
|
EXPORT_SYMBOL(netdev_update_features);
|
|
|
|
/**
|
|
* netdev_change_features - recalculate device features
|
|
* @dev: the device to check
|
|
*
|
|
* Recalculate dev->features set and send notifications even
|
|
* if they have not changed. Should be called instead of
|
|
* netdev_update_features() if also dev->vlan_features might
|
|
* have changed to allow the changes to be propagated to stacked
|
|
* VLAN devices.
|
|
*/
|
|
void netdev_change_features(struct net_device *dev)
|
|
{
|
|
__netdev_update_features(dev);
|
|
netdev_features_change(dev);
|
|
}
|
|
EXPORT_SYMBOL(netdev_change_features);
|
|
|
|
/**
|
|
* netif_stacked_transfer_operstate - transfer operstate
|
|
* @rootdev: the root or lower level device to transfer state from
|
|
* @dev: the device to transfer operstate to
|
|
*
|
|
* Transfer operational state from root to device. This is normally
|
|
* called when a stacking relationship exists between the root
|
|
* device and the device(a leaf device).
|
|
*/
|
|
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
|
|
struct net_device *dev)
|
|
{
|
|
if (rootdev->operstate == IF_OPER_DORMANT)
|
|
netif_dormant_on(dev);
|
|
else
|
|
netif_dormant_off(dev);
|
|
|
|
if (netif_carrier_ok(rootdev)) {
|
|
if (!netif_carrier_ok(dev))
|
|
netif_carrier_on(dev);
|
|
} else {
|
|
if (netif_carrier_ok(dev))
|
|
netif_carrier_off(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netif_stacked_transfer_operstate);
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
static int netif_alloc_rx_queues(struct net_device *dev)
|
|
{
|
|
unsigned int i, count = dev->num_rx_queues;
|
|
struct netdev_rx_queue *rx;
|
|
|
|
BUG_ON(count < 1);
|
|
|
|
rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
|
|
if (!rx)
|
|
return -ENOMEM;
|
|
|
|
dev->_rx = rx;
|
|
|
|
for (i = 0; i < count; i++)
|
|
rx[i].dev = dev;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static void netdev_init_one_queue(struct net_device *dev,
|
|
struct netdev_queue *queue, void *_unused)
|
|
{
|
|
/* Initialize queue lock */
|
|
spin_lock_init(&queue->_xmit_lock);
|
|
netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
|
|
queue->xmit_lock_owner = -1;
|
|
netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
|
|
queue->dev = dev;
|
|
#ifdef CONFIG_BQL
|
|
dql_init(&queue->dql, HZ);
|
|
#endif
|
|
}
|
|
|
|
static void netif_free_tx_queues(struct net_device *dev)
|
|
{
|
|
if (is_vmalloc_addr(dev->_tx))
|
|
vfree(dev->_tx);
|
|
else
|
|
kfree(dev->_tx);
|
|
}
|
|
|
|
static int netif_alloc_netdev_queues(struct net_device *dev)
|
|
{
|
|
unsigned int count = dev->num_tx_queues;
|
|
struct netdev_queue *tx;
|
|
size_t sz = count * sizeof(*tx);
|
|
|
|
BUG_ON(count < 1 || count > 0xffff);
|
|
|
|
tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
|
|
if (!tx) {
|
|
tx = vzalloc(sz);
|
|
if (!tx)
|
|
return -ENOMEM;
|
|
}
|
|
dev->_tx = tx;
|
|
|
|
netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
|
|
spin_lock_init(&dev->tx_global_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* register_netdevice - register a network device
|
|
* @dev: device to register
|
|
*
|
|
* Take a completed network device structure and add it to the kernel
|
|
* interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
|
|
* chain. 0 is returned on success. A negative errno code is returned
|
|
* on a failure to set up the device, or if the name is a duplicate.
|
|
*
|
|
* Callers must hold the rtnl semaphore. You may want
|
|
* register_netdev() instead of this.
|
|
*
|
|
* BUGS:
|
|
* The locking appears insufficient to guarantee two parallel registers
|
|
* will not get the same name.
|
|
*/
|
|
|
|
int register_netdevice(struct net_device *dev)
|
|
{
|
|
int ret;
|
|
struct net *net = dev_net(dev);
|
|
|
|
BUG_ON(dev_boot_phase);
|
|
ASSERT_RTNL();
|
|
|
|
might_sleep();
|
|
|
|
/* When net_device's are persistent, this will be fatal. */
|
|
BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
|
|
BUG_ON(!net);
|
|
|
|
spin_lock_init(&dev->addr_list_lock);
|
|
netdev_set_addr_lockdep_class(dev);
|
|
|
|
dev->iflink = -1;
|
|
|
|
ret = dev_get_valid_name(net, dev, dev->name);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* Init, if this function is available */
|
|
if (dev->netdev_ops->ndo_init) {
|
|
ret = dev->netdev_ops->ndo_init(dev);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (((dev->hw_features | dev->features) &
|
|
NETIF_F_HW_VLAN_CTAG_FILTER) &&
|
|
(!dev->netdev_ops->ndo_vlan_rx_add_vid ||
|
|
!dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
|
|
netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
|
|
ret = -EINVAL;
|
|
goto err_uninit;
|
|
}
|
|
|
|
ret = -EBUSY;
|
|
if (!dev->ifindex)
|
|
dev->ifindex = dev_new_index(net);
|
|
else if (__dev_get_by_index(net, dev->ifindex))
|
|
goto err_uninit;
|
|
|
|
if (dev->iflink == -1)
|
|
dev->iflink = dev->ifindex;
|
|
|
|
/* Transfer changeable features to wanted_features and enable
|
|
* software offloads (GSO and GRO).
|
|
*/
|
|
dev->hw_features |= NETIF_F_SOFT_FEATURES;
|
|
dev->features |= NETIF_F_SOFT_FEATURES;
|
|
dev->wanted_features = dev->features & dev->hw_features;
|
|
|
|
if (!(dev->flags & IFF_LOOPBACK)) {
|
|
dev->hw_features |= NETIF_F_NOCACHE_COPY;
|
|
}
|
|
|
|
/* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
|
|
*/
|
|
dev->vlan_features |= NETIF_F_HIGHDMA;
|
|
|
|
/* Make NETIF_F_SG inheritable to tunnel devices.
|
|
*/
|
|
dev->hw_enc_features |= NETIF_F_SG;
|
|
|
|
/* Make NETIF_F_SG inheritable to MPLS.
|
|
*/
|
|
dev->mpls_features |= NETIF_F_SG;
|
|
|
|
ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
|
|
ret = notifier_to_errno(ret);
|
|
if (ret)
|
|
goto err_uninit;
|
|
|
|
ret = netdev_register_kobject(dev);
|
|
if (ret)
|
|
goto err_uninit;
|
|
dev->reg_state = NETREG_REGISTERED;
|
|
|
|
__netdev_update_features(dev);
|
|
|
|
/*
|
|
* Default initial state at registry is that the
|
|
* device is present.
|
|
*/
|
|
|
|
set_bit(__LINK_STATE_PRESENT, &dev->state);
|
|
|
|
linkwatch_init_dev(dev);
|
|
|
|
dev_init_scheduler(dev);
|
|
dev_hold(dev);
|
|
list_netdevice(dev);
|
|
add_device_randomness(dev->dev_addr, dev->addr_len);
|
|
|
|
/* If the device has permanent device address, driver should
|
|
* set dev_addr and also addr_assign_type should be set to
|
|
* NET_ADDR_PERM (default value).
|
|
*/
|
|
if (dev->addr_assign_type == NET_ADDR_PERM)
|
|
memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
|
|
|
|
/* Notify protocols, that a new device appeared. */
|
|
ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
|
|
ret = notifier_to_errno(ret);
|
|
if (ret) {
|
|
rollback_registered(dev);
|
|
dev->reg_state = NETREG_UNREGISTERED;
|
|
}
|
|
/*
|
|
* Prevent userspace races by waiting until the network
|
|
* device is fully setup before sending notifications.
|
|
*/
|
|
if (!dev->rtnl_link_ops ||
|
|
dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
|
|
|
|
out:
|
|
return ret;
|
|
|
|
err_uninit:
|
|
if (dev->netdev_ops->ndo_uninit)
|
|
dev->netdev_ops->ndo_uninit(dev);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL(register_netdevice);
|
|
|
|
/**
|
|
* init_dummy_netdev - init a dummy network device for NAPI
|
|
* @dev: device to init
|
|
*
|
|
* This takes a network device structure and initialize the minimum
|
|
* amount of fields so it can be used to schedule NAPI polls without
|
|
* registering a full blown interface. This is to be used by drivers
|
|
* that need to tie several hardware interfaces to a single NAPI
|
|
* poll scheduler due to HW limitations.
|
|
*/
|
|
int init_dummy_netdev(struct net_device *dev)
|
|
{
|
|
/* Clear everything. Note we don't initialize spinlocks
|
|
* are they aren't supposed to be taken by any of the
|
|
* NAPI code and this dummy netdev is supposed to be
|
|
* only ever used for NAPI polls
|
|
*/
|
|
memset(dev, 0, sizeof(struct net_device));
|
|
|
|
/* make sure we BUG if trying to hit standard
|
|
* register/unregister code path
|
|
*/
|
|
dev->reg_state = NETREG_DUMMY;
|
|
|
|
/* NAPI wants this */
|
|
INIT_LIST_HEAD(&dev->napi_list);
|
|
|
|
/* a dummy interface is started by default */
|
|
set_bit(__LINK_STATE_PRESENT, &dev->state);
|
|
set_bit(__LINK_STATE_START, &dev->state);
|
|
|
|
/* Note : We dont allocate pcpu_refcnt for dummy devices,
|
|
* because users of this 'device' dont need to change
|
|
* its refcount.
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(init_dummy_netdev);
|
|
|
|
|
|
/**
|
|
* register_netdev - register a network device
|
|
* @dev: device to register
|
|
*
|
|
* Take a completed network device structure and add it to the kernel
|
|
* interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
|
|
* chain. 0 is returned on success. A negative errno code is returned
|
|
* on a failure to set up the device, or if the name is a duplicate.
|
|
*
|
|
* This is a wrapper around register_netdevice that takes the rtnl semaphore
|
|
* and expands the device name if you passed a format string to
|
|
* alloc_netdev.
|
|
*/
|
|
int register_netdev(struct net_device *dev)
|
|
{
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = register_netdevice(dev);
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(register_netdev);
|
|
|
|
int netdev_refcnt_read(const struct net_device *dev)
|
|
{
|
|
int i, refcnt = 0;
|
|
|
|
for_each_possible_cpu(i)
|
|
refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
|
|
return refcnt;
|
|
}
|
|
EXPORT_SYMBOL(netdev_refcnt_read);
|
|
|
|
/**
|
|
* netdev_wait_allrefs - wait until all references are gone.
|
|
* @dev: target net_device
|
|
*
|
|
* This is called when unregistering network devices.
|
|
*
|
|
* Any protocol or device that holds a reference should register
|
|
* for netdevice notification, and cleanup and put back the
|
|
* reference if they receive an UNREGISTER event.
|
|
* We can get stuck here if buggy protocols don't correctly
|
|
* call dev_put.
|
|
*/
|
|
static void netdev_wait_allrefs(struct net_device *dev)
|
|
{
|
|
unsigned long rebroadcast_time, warning_time;
|
|
int refcnt;
|
|
|
|
linkwatch_forget_dev(dev);
|
|
|
|
rebroadcast_time = warning_time = jiffies;
|
|
refcnt = netdev_refcnt_read(dev);
|
|
|
|
while (refcnt != 0) {
|
|
if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
|
|
rtnl_lock();
|
|
|
|
/* Rebroadcast unregister notification */
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
|
|
|
|
__rtnl_unlock();
|
|
rcu_barrier();
|
|
rtnl_lock();
|
|
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
|
|
if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
|
|
&dev->state)) {
|
|
/* We must not have linkwatch events
|
|
* pending on unregister. If this
|
|
* happens, we simply run the queue
|
|
* unscheduled, resulting in a noop
|
|
* for this device.
|
|
*/
|
|
linkwatch_run_queue();
|
|
}
|
|
|
|
__rtnl_unlock();
|
|
|
|
rebroadcast_time = jiffies;
|
|
}
|
|
|
|
msleep(250);
|
|
|
|
refcnt = netdev_refcnt_read(dev);
|
|
|
|
if (time_after(jiffies, warning_time + 10 * HZ)) {
|
|
pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
|
|
dev->name, refcnt);
|
|
warning_time = jiffies;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* The sequence is:
|
|
*
|
|
* rtnl_lock();
|
|
* ...
|
|
* register_netdevice(x1);
|
|
* register_netdevice(x2);
|
|
* ...
|
|
* unregister_netdevice(y1);
|
|
* unregister_netdevice(y2);
|
|
* ...
|
|
* rtnl_unlock();
|
|
* free_netdev(y1);
|
|
* free_netdev(y2);
|
|
*
|
|
* We are invoked by rtnl_unlock().
|
|
* This allows us to deal with problems:
|
|
* 1) We can delete sysfs objects which invoke hotplug
|
|
* without deadlocking with linkwatch via keventd.
|
|
* 2) Since we run with the RTNL semaphore not held, we can sleep
|
|
* safely in order to wait for the netdev refcnt to drop to zero.
|
|
*
|
|
* We must not return until all unregister events added during
|
|
* the interval the lock was held have been completed.
|
|
*/
|
|
void netdev_run_todo(void)
|
|
{
|
|
struct list_head list;
|
|
|
|
/* Snapshot list, allow later requests */
|
|
list_replace_init(&net_todo_list, &list);
|
|
|
|
__rtnl_unlock();
|
|
|
|
|
|
/* Wait for rcu callbacks to finish before next phase */
|
|
if (!list_empty(&list))
|
|
rcu_barrier();
|
|
|
|
while (!list_empty(&list)) {
|
|
struct net_device *dev
|
|
= list_first_entry(&list, struct net_device, todo_list);
|
|
list_del(&dev->todo_list);
|
|
|
|
rtnl_lock();
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
|
|
__rtnl_unlock();
|
|
|
|
if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
|
|
pr_err("network todo '%s' but state %d\n",
|
|
dev->name, dev->reg_state);
|
|
dump_stack();
|
|
continue;
|
|
}
|
|
|
|
dev->reg_state = NETREG_UNREGISTERED;
|
|
|
|
on_each_cpu(flush_backlog, dev, 1);
|
|
|
|
netdev_wait_allrefs(dev);
|
|
|
|
/* paranoia */
|
|
BUG_ON(netdev_refcnt_read(dev));
|
|
WARN_ON(rcu_access_pointer(dev->ip_ptr));
|
|
WARN_ON(rcu_access_pointer(dev->ip6_ptr));
|
|
WARN_ON(dev->dn_ptr);
|
|
|
|
if (dev->destructor)
|
|
dev->destructor(dev);
|
|
|
|
/* Report a network device has been unregistered */
|
|
rtnl_lock();
|
|
dev_net(dev)->dev_unreg_count--;
|
|
__rtnl_unlock();
|
|
wake_up(&netdev_unregistering_wq);
|
|
|
|
/* Free network device */
|
|
kobject_put(&dev->dev.kobj);
|
|
}
|
|
}
|
|
|
|
/* Convert net_device_stats to rtnl_link_stats64. They have the same
|
|
* fields in the same order, with only the type differing.
|
|
*/
|
|
void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
|
|
const struct net_device_stats *netdev_stats)
|
|
{
|
|
#if BITS_PER_LONG == 64
|
|
BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
|
|
memcpy(stats64, netdev_stats, sizeof(*stats64));
|
|
#else
|
|
size_t i, n = sizeof(*stats64) / sizeof(u64);
|
|
const unsigned long *src = (const unsigned long *)netdev_stats;
|
|
u64 *dst = (u64 *)stats64;
|
|
|
|
BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
|
|
sizeof(*stats64) / sizeof(u64));
|
|
for (i = 0; i < n; i++)
|
|
dst[i] = src[i];
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(netdev_stats_to_stats64);
|
|
|
|
/**
|
|
* dev_get_stats - get network device statistics
|
|
* @dev: device to get statistics from
|
|
* @storage: place to store stats
|
|
*
|
|
* Get network statistics from device. Return @storage.
|
|
* The device driver may provide its own method by setting
|
|
* dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
|
|
* otherwise the internal statistics structure is used.
|
|
*/
|
|
struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
|
|
struct rtnl_link_stats64 *storage)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
if (ops->ndo_get_stats64) {
|
|
memset(storage, 0, sizeof(*storage));
|
|
ops->ndo_get_stats64(dev, storage);
|
|
} else if (ops->ndo_get_stats) {
|
|
netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
|
|
} else {
|
|
netdev_stats_to_stats64(storage, &dev->stats);
|
|
}
|
|
storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
|
|
return storage;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_stats);
|
|
|
|
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
|
|
{
|
|
struct netdev_queue *queue = dev_ingress_queue(dev);
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (queue)
|
|
return queue;
|
|
queue = kzalloc(sizeof(*queue), GFP_KERNEL);
|
|
if (!queue)
|
|
return NULL;
|
|
netdev_init_one_queue(dev, queue, NULL);
|
|
queue->qdisc = &noop_qdisc;
|
|
queue->qdisc_sleeping = &noop_qdisc;
|
|
rcu_assign_pointer(dev->ingress_queue, queue);
|
|
#endif
|
|
return queue;
|
|
}
|
|
|
|
static const struct ethtool_ops default_ethtool_ops;
|
|
|
|
void netdev_set_default_ethtool_ops(struct net_device *dev,
|
|
const struct ethtool_ops *ops)
|
|
{
|
|
if (dev->ethtool_ops == &default_ethtool_ops)
|
|
dev->ethtool_ops = ops;
|
|
}
|
|
EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
|
|
|
|
void netdev_freemem(struct net_device *dev)
|
|
{
|
|
char *addr = (char *)dev - dev->padded;
|
|
|
|
if (is_vmalloc_addr(addr))
|
|
vfree(addr);
|
|
else
|
|
kfree(addr);
|
|
}
|
|
|
|
/**
|
|
* alloc_netdev_mqs - allocate network device
|
|
* @sizeof_priv: size of private data to allocate space for
|
|
* @name: device name format string
|
|
* @setup: callback to initialize device
|
|
* @txqs: the number of TX subqueues to allocate
|
|
* @rxqs: the number of RX subqueues to allocate
|
|
*
|
|
* Allocates a struct net_device with private data area for driver use
|
|
* and performs basic initialization. Also allocates subqueue structs
|
|
* for each queue on the device.
|
|
*/
|
|
struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
|
|
void (*setup)(struct net_device *),
|
|
unsigned int txqs, unsigned int rxqs)
|
|
{
|
|
struct net_device *dev;
|
|
size_t alloc_size;
|
|
struct net_device *p;
|
|
|
|
BUG_ON(strlen(name) >= sizeof(dev->name));
|
|
|
|
if (txqs < 1) {
|
|
pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
|
|
return NULL;
|
|
}
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
if (rxqs < 1) {
|
|
pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
alloc_size = sizeof(struct net_device);
|
|
if (sizeof_priv) {
|
|
/* ensure 32-byte alignment of private area */
|
|
alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
|
|
alloc_size += sizeof_priv;
|
|
}
|
|
/* ensure 32-byte alignment of whole construct */
|
|
alloc_size += NETDEV_ALIGN - 1;
|
|
|
|
p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
|
|
if (!p)
|
|
p = vzalloc(alloc_size);
|
|
if (!p)
|
|
return NULL;
|
|
|
|
dev = PTR_ALIGN(p, NETDEV_ALIGN);
|
|
dev->padded = (char *)dev - (char *)p;
|
|
|
|
dev->pcpu_refcnt = alloc_percpu(int);
|
|
if (!dev->pcpu_refcnt)
|
|
goto free_dev;
|
|
|
|
if (dev_addr_init(dev))
|
|
goto free_pcpu;
|
|
|
|
dev_mc_init(dev);
|
|
dev_uc_init(dev);
|
|
|
|
dev_net_set(dev, &init_net);
|
|
|
|
dev->gso_max_size = GSO_MAX_SIZE;
|
|
dev->gso_max_segs = GSO_MAX_SEGS;
|
|
|
|
INIT_LIST_HEAD(&dev->napi_list);
|
|
INIT_LIST_HEAD(&dev->unreg_list);
|
|
INIT_LIST_HEAD(&dev->close_list);
|
|
INIT_LIST_HEAD(&dev->link_watch_list);
|
|
INIT_LIST_HEAD(&dev->adj_list.upper);
|
|
INIT_LIST_HEAD(&dev->adj_list.lower);
|
|
INIT_LIST_HEAD(&dev->all_adj_list.upper);
|
|
INIT_LIST_HEAD(&dev->all_adj_list.lower);
|
|
dev->priv_flags = IFF_XMIT_DST_RELEASE;
|
|
setup(dev);
|
|
|
|
dev->num_tx_queues = txqs;
|
|
dev->real_num_tx_queues = txqs;
|
|
if (netif_alloc_netdev_queues(dev))
|
|
goto free_all;
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
dev->num_rx_queues = rxqs;
|
|
dev->real_num_rx_queues = rxqs;
|
|
if (netif_alloc_rx_queues(dev))
|
|
goto free_all;
|
|
#endif
|
|
|
|
strcpy(dev->name, name);
|
|
dev->group = INIT_NETDEV_GROUP;
|
|
if (!dev->ethtool_ops)
|
|
dev->ethtool_ops = &default_ethtool_ops;
|
|
return dev;
|
|
|
|
free_all:
|
|
free_netdev(dev);
|
|
return NULL;
|
|
|
|
free_pcpu:
|
|
free_percpu(dev->pcpu_refcnt);
|
|
netif_free_tx_queues(dev);
|
|
#ifdef CONFIG_SYSFS
|
|
kfree(dev->_rx);
|
|
#endif
|
|
|
|
free_dev:
|
|
netdev_freemem(dev);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(alloc_netdev_mqs);
|
|
|
|
/**
|
|
* free_netdev - free network device
|
|
* @dev: device
|
|
*
|
|
* This function does the last stage of destroying an allocated device
|
|
* interface. The reference to the device object is released.
|
|
* If this is the last reference then it will be freed.
|
|
*/
|
|
void free_netdev(struct net_device *dev)
|
|
{
|
|
struct napi_struct *p, *n;
|
|
|
|
release_net(dev_net(dev));
|
|
|
|
netif_free_tx_queues(dev);
|
|
#ifdef CONFIG_SYSFS
|
|
kfree(dev->_rx);
|
|
#endif
|
|
|
|
kfree(rcu_dereference_protected(dev->ingress_queue, 1));
|
|
|
|
/* Flush device addresses */
|
|
dev_addr_flush(dev);
|
|
|
|
list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
|
|
netif_napi_del(p);
|
|
|
|
free_percpu(dev->pcpu_refcnt);
|
|
dev->pcpu_refcnt = NULL;
|
|
|
|
/* Compatibility with error handling in drivers */
|
|
if (dev->reg_state == NETREG_UNINITIALIZED) {
|
|
netdev_freemem(dev);
|
|
return;
|
|
}
|
|
|
|
BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
|
|
dev->reg_state = NETREG_RELEASED;
|
|
|
|
/* will free via device release */
|
|
put_device(&dev->dev);
|
|
}
|
|
EXPORT_SYMBOL(free_netdev);
|
|
|
|
/**
|
|
* synchronize_net - Synchronize with packet receive processing
|
|
*
|
|
* Wait for packets currently being received to be done.
|
|
* Does not block later packets from starting.
|
|
*/
|
|
void synchronize_net(void)
|
|
{
|
|
might_sleep();
|
|
if (rtnl_is_locked())
|
|
synchronize_rcu_expedited();
|
|
else
|
|
synchronize_rcu();
|
|
}
|
|
EXPORT_SYMBOL(synchronize_net);
|
|
|
|
/**
|
|
* unregister_netdevice_queue - remove device from the kernel
|
|
* @dev: device
|
|
* @head: list
|
|
*
|
|
* This function shuts down a device interface and removes it
|
|
* from the kernel tables.
|
|
* If head not NULL, device is queued to be unregistered later.
|
|
*
|
|
* Callers must hold the rtnl semaphore. You may want
|
|
* unregister_netdev() instead of this.
|
|
*/
|
|
|
|
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
if (head) {
|
|
list_move_tail(&dev->unreg_list, head);
|
|
} else {
|
|
rollback_registered(dev);
|
|
/* Finish processing unregister after unlock */
|
|
net_set_todo(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(unregister_netdevice_queue);
|
|
|
|
/**
|
|
* unregister_netdevice_many - unregister many devices
|
|
* @head: list of devices
|
|
*/
|
|
void unregister_netdevice_many(struct list_head *head)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
if (!list_empty(head)) {
|
|
rollback_registered_many(head);
|
|
list_for_each_entry(dev, head, unreg_list)
|
|
net_set_todo(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(unregister_netdevice_many);
|
|
|
|
/**
|
|
* unregister_netdev - remove device from the kernel
|
|
* @dev: device
|
|
*
|
|
* This function shuts down a device interface and removes it
|
|
* from the kernel tables.
|
|
*
|
|
* This is just a wrapper for unregister_netdevice that takes
|
|
* the rtnl semaphore. In general you want to use this and not
|
|
* unregister_netdevice.
|
|
*/
|
|
void unregister_netdev(struct net_device *dev)
|
|
{
|
|
rtnl_lock();
|
|
unregister_netdevice(dev);
|
|
rtnl_unlock();
|
|
}
|
|
EXPORT_SYMBOL(unregister_netdev);
|
|
|
|
/**
|
|
* dev_change_net_namespace - move device to different nethost namespace
|
|
* @dev: device
|
|
* @net: network namespace
|
|
* @pat: If not NULL name pattern to try if the current device name
|
|
* is already taken in the destination network namespace.
|
|
*
|
|
* This function shuts down a device interface and moves it
|
|
* to a new network namespace. On success 0 is returned, on
|
|
* a failure a netagive errno code is returned.
|
|
*
|
|
* Callers must hold the rtnl semaphore.
|
|
*/
|
|
|
|
int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
|
|
{
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/* Don't allow namespace local devices to be moved. */
|
|
err = -EINVAL;
|
|
if (dev->features & NETIF_F_NETNS_LOCAL)
|
|
goto out;
|
|
|
|
/* Ensure the device has been registrered */
|
|
if (dev->reg_state != NETREG_REGISTERED)
|
|
goto out;
|
|
|
|
/* Get out if there is nothing todo */
|
|
err = 0;
|
|
if (net_eq(dev_net(dev), net))
|
|
goto out;
|
|
|
|
/* Pick the destination device name, and ensure
|
|
* we can use it in the destination network namespace.
|
|
*/
|
|
err = -EEXIST;
|
|
if (__dev_get_by_name(net, dev->name)) {
|
|
/* We get here if we can't use the current device name */
|
|
if (!pat)
|
|
goto out;
|
|
if (dev_get_valid_name(net, dev, pat) < 0)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* And now a mini version of register_netdevice unregister_netdevice.
|
|
*/
|
|
|
|
/* If device is running close it first. */
|
|
dev_close(dev);
|
|
|
|
/* And unlink it from device chain */
|
|
err = -ENODEV;
|
|
unlist_netdevice(dev);
|
|
|
|
synchronize_net();
|
|
|
|
/* Shutdown queueing discipline. */
|
|
dev_shutdown(dev);
|
|
|
|
/* Notify protocols, that we are about to destroy
|
|
this device. They should clean all the things.
|
|
|
|
Note that dev->reg_state stays at NETREG_REGISTERED.
|
|
This is wanted because this way 8021q and macvlan know
|
|
the device is just moving and can keep their slaves up.
|
|
*/
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
|
|
rcu_barrier();
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
|
|
rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL);
|
|
|
|
/*
|
|
* Flush the unicast and multicast chains
|
|
*/
|
|
dev_uc_flush(dev);
|
|
dev_mc_flush(dev);
|
|
|
|
/* Send a netdev-removed uevent to the old namespace */
|
|
kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
|
|
|
|
/* Actually switch the network namespace */
|
|
dev_net_set(dev, net);
|
|
|
|
/* If there is an ifindex conflict assign a new one */
|
|
if (__dev_get_by_index(net, dev->ifindex)) {
|
|
int iflink = (dev->iflink == dev->ifindex);
|
|
dev->ifindex = dev_new_index(net);
|
|
if (iflink)
|
|
dev->iflink = dev->ifindex;
|
|
}
|
|
|
|
/* Send a netdev-add uevent to the new namespace */
|
|
kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
|
|
|
|
/* Fixup kobjects */
|
|
err = device_rename(&dev->dev, dev->name);
|
|
WARN_ON(err);
|
|
|
|
/* Add the device back in the hashes */
|
|
list_netdevice(dev);
|
|
|
|
/* Notify protocols, that a new device appeared. */
|
|
call_netdevice_notifiers(NETDEV_REGISTER, dev);
|
|
|
|
/*
|
|
* Prevent userspace races by waiting until the network
|
|
* device is fully setup before sending notifications.
|
|
*/
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
|
|
|
|
synchronize_net();
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_change_net_namespace);
|
|
|
|
static int dev_cpu_callback(struct notifier_block *nfb,
|
|
unsigned long action,
|
|
void *ocpu)
|
|
{
|
|
struct sk_buff **list_skb;
|
|
struct sk_buff *skb;
|
|
unsigned int cpu, oldcpu = (unsigned long)ocpu;
|
|
struct softnet_data *sd, *oldsd;
|
|
|
|
if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
|
|
return NOTIFY_OK;
|
|
|
|
local_irq_disable();
|
|
cpu = smp_processor_id();
|
|
sd = &per_cpu(softnet_data, cpu);
|
|
oldsd = &per_cpu(softnet_data, oldcpu);
|
|
|
|
/* Find end of our completion_queue. */
|
|
list_skb = &sd->completion_queue;
|
|
while (*list_skb)
|
|
list_skb = &(*list_skb)->next;
|
|
/* Append completion queue from offline CPU. */
|
|
*list_skb = oldsd->completion_queue;
|
|
oldsd->completion_queue = NULL;
|
|
|
|
/* Append output queue from offline CPU. */
|
|
if (oldsd->output_queue) {
|
|
*sd->output_queue_tailp = oldsd->output_queue;
|
|
sd->output_queue_tailp = oldsd->output_queue_tailp;
|
|
oldsd->output_queue = NULL;
|
|
oldsd->output_queue_tailp = &oldsd->output_queue;
|
|
}
|
|
/* Append NAPI poll list from offline CPU. */
|
|
if (!list_empty(&oldsd->poll_list)) {
|
|
list_splice_init(&oldsd->poll_list, &sd->poll_list);
|
|
raise_softirq_irqoff(NET_RX_SOFTIRQ);
|
|
}
|
|
|
|
raise_softirq_irqoff(NET_TX_SOFTIRQ);
|
|
local_irq_enable();
|
|
|
|
/* Process offline CPU's input_pkt_queue */
|
|
while ((skb = __skb_dequeue(&oldsd->process_queue))) {
|
|
netif_rx_internal(skb);
|
|
input_queue_head_incr(oldsd);
|
|
}
|
|
while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
|
|
netif_rx_internal(skb);
|
|
input_queue_head_incr(oldsd);
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
|
|
/**
|
|
* netdev_increment_features - increment feature set by one
|
|
* @all: current feature set
|
|
* @one: new feature set
|
|
* @mask: mask feature set
|
|
*
|
|
* Computes a new feature set after adding a device with feature set
|
|
* @one to the master device with current feature set @all. Will not
|
|
* enable anything that is off in @mask. Returns the new feature set.
|
|
*/
|
|
netdev_features_t netdev_increment_features(netdev_features_t all,
|
|
netdev_features_t one, netdev_features_t mask)
|
|
{
|
|
if (mask & NETIF_F_GEN_CSUM)
|
|
mask |= NETIF_F_ALL_CSUM;
|
|
mask |= NETIF_F_VLAN_CHALLENGED;
|
|
|
|
all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
|
|
all &= one | ~NETIF_F_ALL_FOR_ALL;
|
|
|
|
/* If one device supports hw checksumming, set for all. */
|
|
if (all & NETIF_F_GEN_CSUM)
|
|
all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
|
|
|
|
return all;
|
|
}
|
|
EXPORT_SYMBOL(netdev_increment_features);
|
|
|
|
static struct hlist_head * __net_init netdev_create_hash(void)
|
|
{
|
|
int i;
|
|
struct hlist_head *hash;
|
|
|
|
hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
|
|
if (hash != NULL)
|
|
for (i = 0; i < NETDEV_HASHENTRIES; i++)
|
|
INIT_HLIST_HEAD(&hash[i]);
|
|
|
|
return hash;
|
|
}
|
|
|
|
/* Initialize per network namespace state */
|
|
static int __net_init netdev_init(struct net *net)
|
|
{
|
|
if (net != &init_net)
|
|
INIT_LIST_HEAD(&net->dev_base_head);
|
|
|
|
net->dev_name_head = netdev_create_hash();
|
|
if (net->dev_name_head == NULL)
|
|
goto err_name;
|
|
|
|
net->dev_index_head = netdev_create_hash();
|
|
if (net->dev_index_head == NULL)
|
|
goto err_idx;
|
|
|
|
return 0;
|
|
|
|
err_idx:
|
|
kfree(net->dev_name_head);
|
|
err_name:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* netdev_drivername - network driver for the device
|
|
* @dev: network device
|
|
*
|
|
* Determine network driver for device.
|
|
*/
|
|
const char *netdev_drivername(const struct net_device *dev)
|
|
{
|
|
const struct device_driver *driver;
|
|
const struct device *parent;
|
|
const char *empty = "";
|
|
|
|
parent = dev->dev.parent;
|
|
if (!parent)
|
|
return empty;
|
|
|
|
driver = parent->driver;
|
|
if (driver && driver->name)
|
|
return driver->name;
|
|
return empty;
|
|
}
|
|
|
|
static int __netdev_printk(const char *level, const struct net_device *dev,
|
|
struct va_format *vaf)
|
|
{
|
|
int r;
|
|
|
|
if (dev && dev->dev.parent) {
|
|
r = dev_printk_emit(level[1] - '0',
|
|
dev->dev.parent,
|
|
"%s %s %s: %pV",
|
|
dev_driver_string(dev->dev.parent),
|
|
dev_name(dev->dev.parent),
|
|
netdev_name(dev), vaf);
|
|
} else if (dev) {
|
|
r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
|
|
} else {
|
|
r = printk("%s(NULL net_device): %pV", level, vaf);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int netdev_printk(const char *level, const struct net_device *dev,
|
|
const char *format, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
int r;
|
|
|
|
va_start(args, format);
|
|
|
|
vaf.fmt = format;
|
|
vaf.va = &args;
|
|
|
|
r = __netdev_printk(level, dev, &vaf);
|
|
|
|
va_end(args);
|
|
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL(netdev_printk);
|
|
|
|
#define define_netdev_printk_level(func, level) \
|
|
int func(const struct net_device *dev, const char *fmt, ...) \
|
|
{ \
|
|
int r; \
|
|
struct va_format vaf; \
|
|
va_list args; \
|
|
\
|
|
va_start(args, fmt); \
|
|
\
|
|
vaf.fmt = fmt; \
|
|
vaf.va = &args; \
|
|
\
|
|
r = __netdev_printk(level, dev, &vaf); \
|
|
\
|
|
va_end(args); \
|
|
\
|
|
return r; \
|
|
} \
|
|
EXPORT_SYMBOL(func);
|
|
|
|
define_netdev_printk_level(netdev_emerg, KERN_EMERG);
|
|
define_netdev_printk_level(netdev_alert, KERN_ALERT);
|
|
define_netdev_printk_level(netdev_crit, KERN_CRIT);
|
|
define_netdev_printk_level(netdev_err, KERN_ERR);
|
|
define_netdev_printk_level(netdev_warn, KERN_WARNING);
|
|
define_netdev_printk_level(netdev_notice, KERN_NOTICE);
|
|
define_netdev_printk_level(netdev_info, KERN_INFO);
|
|
|
|
static void __net_exit netdev_exit(struct net *net)
|
|
{
|
|
kfree(net->dev_name_head);
|
|
kfree(net->dev_index_head);
|
|
}
|
|
|
|
static struct pernet_operations __net_initdata netdev_net_ops = {
|
|
.init = netdev_init,
|
|
.exit = netdev_exit,
|
|
};
|
|
|
|
static void __net_exit default_device_exit(struct net *net)
|
|
{
|
|
struct net_device *dev, *aux;
|
|
/*
|
|
* Push all migratable network devices back to the
|
|
* initial network namespace
|
|
*/
|
|
rtnl_lock();
|
|
for_each_netdev_safe(net, dev, aux) {
|
|
int err;
|
|
char fb_name[IFNAMSIZ];
|
|
|
|
/* Ignore unmoveable devices (i.e. loopback) */
|
|
if (dev->features & NETIF_F_NETNS_LOCAL)
|
|
continue;
|
|
|
|
/* Leave virtual devices for the generic cleanup */
|
|
if (dev->rtnl_link_ops)
|
|
continue;
|
|
|
|
/* Push remaining network devices to init_net */
|
|
snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
|
|
err = dev_change_net_namespace(dev, &init_net, fb_name);
|
|
if (err) {
|
|
pr_emerg("%s: failed to move %s to init_net: %d\n",
|
|
__func__, dev->name, err);
|
|
BUG();
|
|
}
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static void __net_exit rtnl_lock_unregistering(struct list_head *net_list)
|
|
{
|
|
/* Return with the rtnl_lock held when there are no network
|
|
* devices unregistering in any network namespace in net_list.
|
|
*/
|
|
struct net *net;
|
|
bool unregistering;
|
|
DEFINE_WAIT(wait);
|
|
|
|
for (;;) {
|
|
prepare_to_wait(&netdev_unregistering_wq, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
unregistering = false;
|
|
rtnl_lock();
|
|
list_for_each_entry(net, net_list, exit_list) {
|
|
if (net->dev_unreg_count > 0) {
|
|
unregistering = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!unregistering)
|
|
break;
|
|
__rtnl_unlock();
|
|
schedule();
|
|
}
|
|
finish_wait(&netdev_unregistering_wq, &wait);
|
|
}
|
|
|
|
static void __net_exit default_device_exit_batch(struct list_head *net_list)
|
|
{
|
|
/* At exit all network devices most be removed from a network
|
|
* namespace. Do this in the reverse order of registration.
|
|
* Do this across as many network namespaces as possible to
|
|
* improve batching efficiency.
|
|
*/
|
|
struct net_device *dev;
|
|
struct net *net;
|
|
LIST_HEAD(dev_kill_list);
|
|
|
|
/* To prevent network device cleanup code from dereferencing
|
|
* loopback devices or network devices that have been freed
|
|
* wait here for all pending unregistrations to complete,
|
|
* before unregistring the loopback device and allowing the
|
|
* network namespace be freed.
|
|
*
|
|
* The netdev todo list containing all network devices
|
|
* unregistrations that happen in default_device_exit_batch
|
|
* will run in the rtnl_unlock() at the end of
|
|
* default_device_exit_batch.
|
|
*/
|
|
rtnl_lock_unregistering(net_list);
|
|
list_for_each_entry(net, net_list, exit_list) {
|
|
for_each_netdev_reverse(net, dev) {
|
|
if (dev->rtnl_link_ops)
|
|
dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
|
|
else
|
|
unregister_netdevice_queue(dev, &dev_kill_list);
|
|
}
|
|
}
|
|
unregister_netdevice_many(&dev_kill_list);
|
|
list_del(&dev_kill_list);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct pernet_operations __net_initdata default_device_ops = {
|
|
.exit = default_device_exit,
|
|
.exit_batch = default_device_exit_batch,
|
|
};
|
|
|
|
/*
|
|
* Initialize the DEV module. At boot time this walks the device list and
|
|
* unhooks any devices that fail to initialise (normally hardware not
|
|
* present) and leaves us with a valid list of present and active devices.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* This is called single threaded during boot, so no need
|
|
* to take the rtnl semaphore.
|
|
*/
|
|
static int __init net_dev_init(void)
|
|
{
|
|
int i, rc = -ENOMEM;
|
|
|
|
BUG_ON(!dev_boot_phase);
|
|
|
|
if (dev_proc_init())
|
|
goto out;
|
|
|
|
if (netdev_kobject_init())
|
|
goto out;
|
|
|
|
INIT_LIST_HEAD(&ptype_all);
|
|
for (i = 0; i < PTYPE_HASH_SIZE; i++)
|
|
INIT_LIST_HEAD(&ptype_base[i]);
|
|
|
|
INIT_LIST_HEAD(&offload_base);
|
|
|
|
if (register_pernet_subsys(&netdev_net_ops))
|
|
goto out;
|
|
|
|
/*
|
|
* Initialise the packet receive queues.
|
|
*/
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct softnet_data *sd = &per_cpu(softnet_data, i);
|
|
|
|
skb_queue_head_init(&sd->input_pkt_queue);
|
|
skb_queue_head_init(&sd->process_queue);
|
|
INIT_LIST_HEAD(&sd->poll_list);
|
|
sd->output_queue_tailp = &sd->output_queue;
|
|
#ifdef CONFIG_RPS
|
|
sd->csd.func = rps_trigger_softirq;
|
|
sd->csd.info = sd;
|
|
sd->cpu = i;
|
|
#endif
|
|
|
|
sd->backlog.poll = process_backlog;
|
|
sd->backlog.weight = weight_p;
|
|
}
|
|
|
|
dev_boot_phase = 0;
|
|
|
|
/* The loopback device is special if any other network devices
|
|
* is present in a network namespace the loopback device must
|
|
* be present. Since we now dynamically allocate and free the
|
|
* loopback device ensure this invariant is maintained by
|
|
* keeping the loopback device as the first device on the
|
|
* list of network devices. Ensuring the loopback devices
|
|
* is the first device that appears and the last network device
|
|
* that disappears.
|
|
*/
|
|
if (register_pernet_device(&loopback_net_ops))
|
|
goto out;
|
|
|
|
if (register_pernet_device(&default_device_ops))
|
|
goto out;
|
|
|
|
open_softirq(NET_TX_SOFTIRQ, net_tx_action);
|
|
open_softirq(NET_RX_SOFTIRQ, net_rx_action);
|
|
|
|
hotcpu_notifier(dev_cpu_callback, 0);
|
|
dst_init();
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
subsys_initcall(net_dev_init);
|