[NET]: Generic Large Receive Offload for TCP traffic
This patch provides generic Large Receive Offload (LRO) functionality for IPv4/TCP traffic. LRO combines received tcp packets to a single larger tcp packet and passes them then to the network stack in order to increase performance (throughput). The interface supports two modes: Drivers can either pass SKBs or fragment lists to the LRO engine. Signed-off-by: Jan-Bernd Themann <themann@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jan-Bernd Themann
David S. Miller
parent
e314dbdc1c
commit
71c87e0ced
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@ -0,0 +1,177 @@
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/*
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* linux/include/linux/inet_lro.h
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*
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* Large Receive Offload (ipv4 / tcp)
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*
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* (C) Copyright IBM Corp. 2007
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*
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* Authors:
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* Jan-Bernd Themann <themann@de.ibm.com>
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* Christoph Raisch <raisch@de.ibm.com>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __INET_LRO_H_
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#define __INET_LRO_H_
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#include <net/ip.h>
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#include <net/tcp.h>
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/*
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* LRO statistics
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*/
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struct net_lro_stats {
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unsigned long aggregated;
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unsigned long flushed;
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unsigned long no_desc;
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};
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/*
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* LRO descriptor for a tcp session
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*/
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struct net_lro_desc {
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struct sk_buff *parent;
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struct sk_buff *last_skb;
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struct skb_frag_struct *next_frag;
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struct iphdr *iph;
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struct tcphdr *tcph;
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struct vlan_group *vgrp;
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__wsum data_csum;
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u32 tcp_rcv_tsecr;
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u32 tcp_rcv_tsval;
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u32 tcp_ack;
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u32 tcp_next_seq;
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u32 skb_tot_frags_len;
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u16 ip_tot_len;
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u16 tcp_saw_tstamp; /* timestamps enabled */
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u16 tcp_window;
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u16 vlan_tag;
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int pkt_aggr_cnt; /* counts aggregated packets */
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int vlan_packet;
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int mss;
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int active;
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};
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/*
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* Large Receive Offload (LRO) Manager
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*
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* Fields must be set by driver
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*/
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struct net_lro_mgr {
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struct net_device *dev;
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struct net_lro_stats stats;
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/* LRO features */
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unsigned long features;
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#define LRO_F_NAPI 1 /* Pass packets to stack via NAPI */
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#define LRO_F_EXTRACT_VLAN_ID 2 /* Set flag if VLAN IDs are extracted
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from received packets and eth protocol
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is still ETH_P_8021Q */
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u32 ip_summed; /* Set in non generated SKBs in page mode */
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u32 ip_summed_aggr; /* Set in aggregated SKBs: CHECKSUM_UNNECESSARY
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* or CHECKSUM_NONE */
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int max_desc; /* Max number of LRO descriptors */
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int max_aggr; /* Max number of LRO packets to be aggregated */
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struct net_lro_desc *lro_arr; /* Array of LRO descriptors */
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/*
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* Optimized driver functions
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*
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* get_skb_header: returns tcp and ip header for packet in SKB
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*/
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int (*get_skb_header)(struct sk_buff *skb, void **ip_hdr,
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void **tcpudp_hdr, u64 *hdr_flags, void *priv);
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/* hdr_flags: */
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#define LRO_IPV4 1 /* ip_hdr is IPv4 header */
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#define LRO_TCP 2 /* tcpudp_hdr is TCP header */
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/*
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* get_frag_header: returns mac, tcp and ip header for packet in SKB
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*
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* @hdr_flags: Indicate what kind of LRO has to be done
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* (IPv4/IPv6/TCP/UDP)
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*/
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int (*get_frag_header)(struct skb_frag_struct *frag, void **mac_hdr,
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void **ip_hdr, void **tcpudp_hdr, u64 *hdr_flags,
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void *priv);
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};
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/*
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* Processes a SKB
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*
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* @lro_mgr: LRO manager to use
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* @skb: SKB to aggregate
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* @priv: Private data that may be used by driver functions
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* (for example get_tcp_ip_hdr)
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*/
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void lro_receive_skb(struct net_lro_mgr *lro_mgr,
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struct sk_buff *skb,
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void *priv);
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/*
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* Processes a SKB with VLAN HW acceleration support
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*/
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void lro_vlan_hwaccel_receive_skb(struct net_lro_mgr *lro_mgr,
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struct sk_buff *skb,
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struct vlan_group *vgrp,
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u16 vlan_tag,
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void *priv);
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/*
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* Processes a fragment list
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*
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* This functions aggregate fragments and generate SKBs do pass
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* the packets to the stack.
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*
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* @lro_mgr: LRO manager to use
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* @frags: Fragment to be processed. Must contain entire header in first
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* element.
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* @len: Length of received data
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* @true_size: Actual size of memory the fragment is consuming
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* @priv: Private data that may be used by driver functions
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* (for example get_tcp_ip_hdr)
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*/
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void lro_receive_frags(struct net_lro_mgr *lro_mgr,
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struct skb_frag_struct *frags,
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int len, int true_size, void *priv, __wsum sum);
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void lro_vlan_hwaccel_receive_frags(struct net_lro_mgr *lro_mgr,
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struct skb_frag_struct *frags,
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int len, int true_size,
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struct vlan_group *vgrp,
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u16 vlan_tag,
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void *priv, __wsum sum);
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/*
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* Forward all aggregated SKBs held by lro_mgr to network stack
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*/
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void lro_flush_all(struct net_lro_mgr *lro_mgr);
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void lro_flush_pkt(struct net_lro_mgr *lro_mgr,
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struct iphdr *iph, struct tcphdr *tcph);
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#endif
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@ -394,6 +394,14 @@ config INET_XFRM_MODE_BEET
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If unsure, say Y.
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config INET_LRO
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tristate "Large Receive Offload (ipv4/tcp)"
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---help---
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Support for Large Receive Offload (ipv4/tcp).
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If unsure, say Y.
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config INET_DIAG
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tristate "INET: socket monitoring interface"
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default y
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@ -25,6 +25,7 @@ obj-$(CONFIG_INET_ESP) += esp4.o
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obj-$(CONFIG_INET_IPCOMP) += ipcomp.o
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obj-$(CONFIG_INET_XFRM_TUNNEL) += xfrm4_tunnel.o
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obj-$(CONFIG_INET_XFRM_MODE_BEET) += xfrm4_mode_beet.o
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obj-$(CONFIG_INET_LRO) += inet_lro.o
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obj-$(CONFIG_INET_TUNNEL) += tunnel4.o
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obj-$(CONFIG_INET_XFRM_MODE_TRANSPORT) += xfrm4_mode_transport.o
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obj-$(CONFIG_INET_XFRM_MODE_TUNNEL) += xfrm4_mode_tunnel.o
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@ -0,0 +1,600 @@
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/*
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* linux/net/ipv4/inet_lro.c
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*
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* Large Receive Offload (ipv4 / tcp)
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*
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* (C) Copyright IBM Corp. 2007
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*
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* Authors:
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* Jan-Bernd Themann <themann@de.ibm.com>
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* Christoph Raisch <raisch@de.ibm.com>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/if_vlan.h>
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#include <linux/inet_lro.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jan-Bernd Themann <themann@de.ibm.com>");
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MODULE_DESCRIPTION("Large Receive Offload (ipv4 / tcp)");
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#define TCP_HDR_LEN(tcph) (tcph->doff << 2)
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#define IP_HDR_LEN(iph) (iph->ihl << 2)
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#define TCP_PAYLOAD_LENGTH(iph, tcph) \
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(ntohs(iph->tot_len) - IP_HDR_LEN(iph) - TCP_HDR_LEN(tcph))
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#define IPH_LEN_WO_OPTIONS 5
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#define TCPH_LEN_WO_OPTIONS 5
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#define TCPH_LEN_W_TIMESTAMP 8
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#define LRO_MAX_PG_HLEN 64
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#define LRO_INC_STATS(lro_mgr, attr) { lro_mgr->stats.attr++; }
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/*
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* Basic tcp checks whether packet is suitable for LRO
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*/
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static int lro_tcp_ip_check(struct iphdr *iph, struct tcphdr *tcph,
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int len, struct net_lro_desc *lro_desc)
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{
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/* check ip header: don't aggregate padded frames */
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if (ntohs(iph->tot_len) != len)
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return -1;
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if (TCP_PAYLOAD_LENGTH(iph, tcph) == 0)
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return -1;
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if (iph->ihl != IPH_LEN_WO_OPTIONS)
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return -1;
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if (tcph->cwr || tcph->ece || tcph->urg || !tcph->ack
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|| tcph->rst || tcph->syn || tcph->fin)
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return -1;
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if (INET_ECN_is_ce(ipv4_get_dsfield(iph)))
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return -1;
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if (tcph->doff != TCPH_LEN_WO_OPTIONS
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&& tcph->doff != TCPH_LEN_W_TIMESTAMP)
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return -1;
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/* check tcp options (only timestamp allowed) */
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if (tcph->doff == TCPH_LEN_W_TIMESTAMP) {
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u32 *topt = (u32 *)(tcph + 1);
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if (*topt != htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16)
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| (TCPOPT_TIMESTAMP << 8)
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| TCPOLEN_TIMESTAMP))
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return -1;
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/* timestamp should be in right order */
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topt++;
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if (lro_desc && after(ntohl(lro_desc->tcp_rcv_tsval),
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ntohl(*topt)))
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return -1;
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/* timestamp reply should not be zero */
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topt++;
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if (*topt == 0)
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return -1;
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}
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return 0;
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}
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static void lro_update_tcp_ip_header(struct net_lro_desc *lro_desc)
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{
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struct iphdr *iph = lro_desc->iph;
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struct tcphdr *tcph = lro_desc->tcph;
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u32 *p;
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__wsum tcp_hdr_csum;
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tcph->ack_seq = lro_desc->tcp_ack;
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tcph->window = lro_desc->tcp_window;
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if (lro_desc->tcp_saw_tstamp) {
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p = (u32 *)(tcph + 1);
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*(p+2) = lro_desc->tcp_rcv_tsecr;
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}
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iph->tot_len = htons(lro_desc->ip_tot_len);
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iph->check = 0;
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iph->check = ip_fast_csum((u8 *)lro_desc->iph, iph->ihl);
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tcph->check = 0;
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tcp_hdr_csum = csum_partial((u8 *)tcph, TCP_HDR_LEN(tcph), 0);
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lro_desc->data_csum = csum_add(lro_desc->data_csum, tcp_hdr_csum);
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tcph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
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lro_desc->ip_tot_len -
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IP_HDR_LEN(iph), IPPROTO_TCP,
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lro_desc->data_csum);
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}
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static __wsum lro_tcp_data_csum(struct iphdr *iph, struct tcphdr *tcph, int len)
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{
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__wsum tcp_csum;
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__wsum tcp_hdr_csum;
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__wsum tcp_ps_hdr_csum;
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tcp_csum = ~csum_unfold(tcph->check);
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tcp_hdr_csum = csum_partial((u8 *)tcph, TCP_HDR_LEN(tcph), tcp_csum);
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tcp_ps_hdr_csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
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len + TCP_HDR_LEN(tcph),
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IPPROTO_TCP, 0);
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return csum_sub(csum_sub(tcp_csum, tcp_hdr_csum),
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tcp_ps_hdr_csum);
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}
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static void lro_init_desc(struct net_lro_desc *lro_desc, struct sk_buff *skb,
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struct iphdr *iph, struct tcphdr *tcph,
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u16 vlan_tag, struct vlan_group *vgrp)
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{
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int nr_frags;
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u32 *ptr;
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u32 tcp_data_len = TCP_PAYLOAD_LENGTH(iph, tcph);
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nr_frags = skb_shinfo(skb)->nr_frags;
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lro_desc->parent = skb;
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lro_desc->next_frag = &(skb_shinfo(skb)->frags[nr_frags]);
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lro_desc->iph = iph;
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lro_desc->tcph = tcph;
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lro_desc->tcp_next_seq = ntohl(tcph->seq) + tcp_data_len;
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lro_desc->tcp_ack = ntohl(tcph->ack_seq);
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lro_desc->tcp_window = tcph->window;
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lro_desc->pkt_aggr_cnt = 1;
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lro_desc->ip_tot_len = ntohs(iph->tot_len);
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if (tcph->doff == 8) {
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ptr = (u32 *)(tcph+1);
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lro_desc->tcp_saw_tstamp = 1;
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lro_desc->tcp_rcv_tsval = *(ptr+1);
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lro_desc->tcp_rcv_tsecr = *(ptr+2);
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}
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lro_desc->mss = tcp_data_len;
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lro_desc->vgrp = vgrp;
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lro_desc->vlan_tag = vlan_tag;
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lro_desc->active = 1;
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lro_desc->data_csum = lro_tcp_data_csum(iph, tcph,
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tcp_data_len);
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}
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static inline void lro_clear_desc(struct net_lro_desc *lro_desc)
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{
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memset(lro_desc, 0, sizeof(struct net_lro_desc));
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}
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static void lro_add_common(struct net_lro_desc *lro_desc, struct iphdr *iph,
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struct tcphdr *tcph, int tcp_data_len)
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{
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struct sk_buff *parent = lro_desc->parent;
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u32 *topt;
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lro_desc->pkt_aggr_cnt++;
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lro_desc->ip_tot_len += tcp_data_len;
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lro_desc->tcp_next_seq += tcp_data_len;
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lro_desc->tcp_window = tcph->window;
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lro_desc->tcp_ack = tcph->ack_seq;
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/* don't update tcp_rcv_tsval, would not work with PAWS */
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if (lro_desc->tcp_saw_tstamp) {
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topt = (u32 *) (tcph + 1);
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lro_desc->tcp_rcv_tsecr = *(topt + 2);
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}
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lro_desc->data_csum = csum_block_add(lro_desc->data_csum,
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lro_tcp_data_csum(iph, tcph,
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tcp_data_len),
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parent->len);
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parent->len += tcp_data_len;
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parent->data_len += tcp_data_len;
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if (tcp_data_len > lro_desc->mss)
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lro_desc->mss = tcp_data_len;
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}
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static void lro_add_packet(struct net_lro_desc *lro_desc, struct sk_buff *skb,
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struct iphdr *iph, struct tcphdr *tcph)
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{
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struct sk_buff *parent = lro_desc->parent;
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int tcp_data_len = TCP_PAYLOAD_LENGTH(iph, tcph);
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lro_add_common(lro_desc, iph, tcph, tcp_data_len);
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skb_pull(skb, (skb->len - tcp_data_len));
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parent->truesize += skb->truesize;
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if (lro_desc->last_skb)
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lro_desc->last_skb->next = skb;
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else
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skb_shinfo(parent)->frag_list = skb;
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lro_desc->last_skb = skb;
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}
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static void lro_add_frags(struct net_lro_desc *lro_desc,
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int len, int hlen, int truesize,
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struct skb_frag_struct *skb_frags,
|
||||
struct iphdr *iph, struct tcphdr *tcph)
|
||||
{
|
||||
struct sk_buff *skb = lro_desc->parent;
|
||||
int tcp_data_len = TCP_PAYLOAD_LENGTH(iph, tcph);
|
||||
|
||||
lro_add_common(lro_desc, iph, tcph, tcp_data_len);
|
||||
|
||||
skb->truesize += truesize;
|
||||
|
||||
skb_frags[0].page_offset += hlen;
|
||||
skb_frags[0].size -= hlen;
|
||||
|
||||
while (tcp_data_len > 0) {
|
||||
*(lro_desc->next_frag) = *skb_frags;
|
||||
tcp_data_len -= skb_frags->size;
|
||||
lro_desc->next_frag++;
|
||||
skb_frags++;
|
||||
skb_shinfo(skb)->nr_frags++;
|
||||
}
|
||||
}
|
||||
|
||||
static int lro_check_tcp_conn(struct net_lro_desc *lro_desc,
|
||||
struct iphdr *iph,
|
||||
struct tcphdr *tcph)
|
||||
{
|
||||
if ((lro_desc->iph->saddr != iph->saddr)
|
||||
|| (lro_desc->iph->daddr != iph->daddr)
|
||||
|| (lro_desc->tcph->source != tcph->source)
|
||||
|| (lro_desc->tcph->dest != tcph->dest))
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct net_lro_desc *lro_get_desc(struct net_lro_mgr *lro_mgr,
|
||||
struct net_lro_desc *lro_arr,
|
||||
struct iphdr *iph,
|
||||
struct tcphdr *tcph)
|
||||
{
|
||||
struct net_lro_desc *lro_desc = NULL;
|
||||
struct net_lro_desc *tmp;
|
||||
int max_desc = lro_mgr->max_desc;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < max_desc; i++) {
|
||||
tmp = &lro_arr[i];
|
||||
if (tmp->active)
|
||||
if (!lro_check_tcp_conn(tmp, iph, tcph)) {
|
||||
lro_desc = tmp;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < max_desc; i++) {
|
||||
if (!lro_arr[i].active) {
|
||||
lro_desc = &lro_arr[i];
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
LRO_INC_STATS(lro_mgr, no_desc);
|
||||
out:
|
||||
return lro_desc;
|
||||
}
|
||||
|
||||
static void lro_flush(struct net_lro_mgr *lro_mgr,
|
||||
struct net_lro_desc *lro_desc)
|
||||
{
|
||||
if (lro_desc->pkt_aggr_cnt > 1)
|
||||
lro_update_tcp_ip_header(lro_desc);
|
||||
|
||||
skb_shinfo(lro_desc->parent)->gso_size = lro_desc->mss;
|
||||
|
||||
if (lro_desc->vgrp) {
|
||||
if (test_bit(LRO_F_NAPI, &lro_mgr->features))
|
||||
vlan_hwaccel_receive_skb(lro_desc->parent,
|
||||
lro_desc->vgrp,
|
||||
lro_desc->vlan_tag);
|
||||
else
|
||||
vlan_hwaccel_rx(lro_desc->parent,
|
||||
lro_desc->vgrp,
|
||||
lro_desc->vlan_tag);
|
||||
|
||||
} else {
|
||||
if (test_bit(LRO_F_NAPI, &lro_mgr->features))
|
||||
netif_receive_skb(lro_desc->parent);
|
||||
else
|
||||
netif_rx(lro_desc->parent);
|
||||
}
|
||||
|
||||
LRO_INC_STATS(lro_mgr, flushed);
|
||||
lro_clear_desc(lro_desc);
|
||||
}
|
||||
|
||||
static int __lro_proc_skb(struct net_lro_mgr *lro_mgr, struct sk_buff *skb,
|
||||
struct vlan_group *vgrp, u16 vlan_tag, void *priv)
|
||||
{
|
||||
struct net_lro_desc *lro_desc;
|
||||
struct iphdr *iph;
|
||||
struct tcphdr *tcph;
|
||||
u64 flags;
|
||||
int vlan_hdr_len = 0;
|
||||
|
||||
if (!lro_mgr->get_skb_header
|
||||
|| lro_mgr->get_skb_header(skb, (void *)&iph, (void *)&tcph,
|
||||
&flags, priv))
|
||||
goto out;
|
||||
|
||||
if (!(flags & LRO_IPV4) || !(flags & LRO_TCP))
|
||||
goto out;
|
||||
|
||||
lro_desc = lro_get_desc(lro_mgr, lro_mgr->lro_arr, iph, tcph);
|
||||
if (!lro_desc)
|
||||
goto out;
|
||||
|
||||
if ((skb->protocol == htons(ETH_P_8021Q))
|
||||
&& !test_bit(LRO_F_EXTRACT_VLAN_ID, &lro_mgr->features))
|
||||
vlan_hdr_len = VLAN_HLEN;
|
||||
|
||||
if (!lro_desc->active) { /* start new lro session */
|
||||
if (lro_tcp_ip_check(iph, tcph, skb->len - vlan_hdr_len, NULL))
|
||||
goto out;
|
||||
|
||||
skb->ip_summed = lro_mgr->ip_summed_aggr;
|
||||
lro_init_desc(lro_desc, skb, iph, tcph, vlan_tag, vgrp);
|
||||
LRO_INC_STATS(lro_mgr, aggregated);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (lro_desc->tcp_next_seq != ntohl(tcph->seq))
|
||||
goto out2;
|
||||
|
||||
if (lro_tcp_ip_check(iph, tcph, skb->len, lro_desc))
|
||||
goto out2;
|
||||
|
||||
lro_add_packet(lro_desc, skb, iph, tcph);
|
||||
LRO_INC_STATS(lro_mgr, aggregated);
|
||||
|
||||
if ((lro_desc->pkt_aggr_cnt >= lro_mgr->max_aggr) ||
|
||||
lro_desc->parent->len > (0xFFFF - lro_mgr->dev->mtu))
|
||||
lro_flush(lro_mgr, lro_desc);
|
||||
|
||||
return 0;
|
||||
|
||||
out2: /* send aggregated SKBs to stack */
|
||||
lro_flush(lro_mgr, lro_desc);
|
||||
|
||||
out: /* Original SKB has to be posted to stack */
|
||||
skb->ip_summed = lro_mgr->ip_summed;
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
static struct sk_buff *lro_gen_skb(struct net_lro_mgr *lro_mgr,
|
||||
struct skb_frag_struct *frags,
|
||||
int len, int true_size,
|
||||
void *mac_hdr,
|
||||
int hlen, __wsum sum,
|
||||
u32 ip_summed)
|
||||
{
|
||||
struct sk_buff *skb;
|
||||
struct skb_frag_struct *skb_frags;
|
||||
int data_len = len;
|
||||
int hdr_len = min(len, hlen);
|
||||
|
||||
skb = netdev_alloc_skb(lro_mgr->dev, hlen);
|
||||
if (!skb)
|
||||
return NULL;
|
||||
|
||||
skb->len = len;
|
||||
skb->data_len = len - hdr_len;
|
||||
skb->truesize += true_size;
|
||||
skb->tail += hdr_len;
|
||||
|
||||
memcpy(skb->data, mac_hdr, hdr_len);
|
||||
|
||||
skb_frags = skb_shinfo(skb)->frags;
|
||||
while (data_len > 0) {
|
||||
*skb_frags = *frags;
|
||||
data_len -= frags->size;
|
||||
skb_frags++;
|
||||
frags++;
|
||||
skb_shinfo(skb)->nr_frags++;
|
||||
}
|
||||
|
||||
skb_shinfo(skb)->frags[0].page_offset += hdr_len;
|
||||
skb_shinfo(skb)->frags[0].size -= hdr_len;
|
||||
|
||||
skb->ip_summed = ip_summed;
|
||||
skb->csum = sum;
|
||||
skb->protocol = eth_type_trans(skb, lro_mgr->dev);
|
||||
return skb;
|
||||
}
|
||||
|
||||
static struct sk_buff *__lro_proc_segment(struct net_lro_mgr *lro_mgr,
|
||||
struct skb_frag_struct *frags,
|
||||
int len, int true_size,
|
||||
struct vlan_group *vgrp,
|
||||
u16 vlan_tag, void *priv, __wsum sum)
|
||||
{
|
||||
struct net_lro_desc *lro_desc;
|
||||
struct iphdr *iph;
|
||||
struct tcphdr *tcph;
|
||||
struct sk_buff *skb;
|
||||
u64 flags;
|
||||
void *mac_hdr;
|
||||
int mac_hdr_len;
|
||||
int hdr_len = LRO_MAX_PG_HLEN;
|
||||
int vlan_hdr_len = 0;
|
||||
|
||||
if (!lro_mgr->get_frag_header
|
||||
|| lro_mgr->get_frag_header(frags, (void *)&mac_hdr, (void *)&iph,
|
||||
(void *)&tcph, &flags, priv)) {
|
||||
mac_hdr = page_address(frags->page) + frags->page_offset;
|
||||
goto out1;
|
||||
}
|
||||
|
||||
if (!(flags & LRO_IPV4) || !(flags & LRO_TCP))
|
||||
goto out1;
|
||||
|
||||
hdr_len = (int)((void *)(tcph) + TCP_HDR_LEN(tcph) - mac_hdr);
|
||||
mac_hdr_len = (int)((void *)(iph) - mac_hdr);
|
||||
|
||||
lro_desc = lro_get_desc(lro_mgr, lro_mgr->lro_arr, iph, tcph);
|
||||
if (!lro_desc)
|
||||
goto out1;
|
||||
|
||||
if (!lro_desc->active) { /* start new lro session */
|
||||
if (lro_tcp_ip_check(iph, tcph, len - mac_hdr_len, NULL))
|
||||
goto out1;
|
||||
|
||||
skb = lro_gen_skb(lro_mgr, frags, len, true_size, mac_hdr,
|
||||
hdr_len, 0, lro_mgr->ip_summed_aggr);
|
||||
if (!skb)
|
||||
goto out;
|
||||
|
||||
if ((skb->protocol == htons(ETH_P_8021Q))
|
||||
&& !test_bit(LRO_F_EXTRACT_VLAN_ID, &lro_mgr->features))
|
||||
vlan_hdr_len = VLAN_HLEN;
|
||||
|
||||
iph = (void *)(skb->data + vlan_hdr_len);
|
||||
tcph = (void *)((u8 *)skb->data + vlan_hdr_len
|
||||
+ IP_HDR_LEN(iph));
|
||||
|
||||
lro_init_desc(lro_desc, skb, iph, tcph, 0, NULL);
|
||||
LRO_INC_STATS(lro_mgr, aggregated);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (lro_desc->tcp_next_seq != ntohl(tcph->seq))
|
||||
goto out2;
|
||||
|
||||
if (lro_tcp_ip_check(iph, tcph, len - mac_hdr_len, lro_desc))
|
||||
goto out2;
|
||||
|
||||
lro_add_frags(lro_desc, len, hdr_len, true_size, frags, iph, tcph);
|
||||
LRO_INC_STATS(lro_mgr, aggregated);
|
||||
|
||||
if ((skb_shinfo(lro_desc->parent)->nr_frags >= lro_mgr->max_aggr) ||
|
||||
lro_desc->parent->len > (0xFFFF - lro_mgr->dev->mtu))
|
||||
lro_flush(lro_mgr, lro_desc);
|
||||
|
||||
return NULL;
|
||||
|
||||
out2: /* send aggregated packets to the stack */
|
||||
lro_flush(lro_mgr, lro_desc);
|
||||
|
||||
out1: /* Original packet has to be posted to the stack */
|
||||
skb = lro_gen_skb(lro_mgr, frags, len, true_size, mac_hdr,
|
||||
hdr_len, sum, lro_mgr->ip_summed);
|
||||
out:
|
||||
return skb;
|
||||
}
|
||||
|
||||
void lro_receive_skb(struct net_lro_mgr *lro_mgr,
|
||||
struct sk_buff *skb,
|
||||
void *priv)
|
||||
{
|
||||
if (__lro_proc_skb(lro_mgr, skb, NULL, 0, priv)) {
|
||||
if (test_bit(LRO_F_NAPI, &lro_mgr->features))
|
||||
netif_receive_skb(skb);
|
||||
else
|
||||
netif_rx(skb);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(lro_receive_skb);
|
||||
|
||||
void lro_vlan_hwaccel_receive_skb(struct net_lro_mgr *lro_mgr,
|
||||
struct sk_buff *skb,
|
||||
struct vlan_group *vgrp,
|
||||
u16 vlan_tag,
|
||||
void *priv)
|
||||
{
|
||||
if (__lro_proc_skb(lro_mgr, skb, vgrp, vlan_tag, priv)) {
|
||||
if (test_bit(LRO_F_NAPI, &lro_mgr->features))
|
||||
vlan_hwaccel_receive_skb(skb, vgrp, vlan_tag);
|
||||
else
|
||||
vlan_hwaccel_rx(skb, vgrp, vlan_tag);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(lro_vlan_hwaccel_receive_skb);
|
||||
|
||||
void lro_receive_frags(struct net_lro_mgr *lro_mgr,
|
||||
struct skb_frag_struct *frags,
|
||||
int len, int true_size, void *priv, __wsum sum)
|
||||
{
|
||||
struct sk_buff *skb;
|
||||
|
||||
skb = __lro_proc_segment(lro_mgr, frags, len, true_size, NULL, 0,
|
||||
priv, sum);
|
||||
if (!skb)
|
||||
return;
|
||||
|
||||
if (test_bit(LRO_F_NAPI, &lro_mgr->features))
|
||||
netif_receive_skb(skb);
|
||||
else
|
||||
netif_rx(skb);
|
||||
}
|
||||
EXPORT_SYMBOL(lro_receive_frags);
|
||||
|
||||
void lro_vlan_hwaccel_receive_frags(struct net_lro_mgr *lro_mgr,
|
||||
struct skb_frag_struct *frags,
|
||||
int len, int true_size,
|
||||
struct vlan_group *vgrp,
|
||||
u16 vlan_tag, void *priv, __wsum sum)
|
||||
{
|
||||
struct sk_buff *skb;
|
||||
|
||||
skb = __lro_proc_segment(lro_mgr, frags, len, true_size, vgrp,
|
||||
vlan_tag, priv, sum);
|
||||
if (!skb)
|
||||
return;
|
||||
|
||||
if (test_bit(LRO_F_NAPI, &lro_mgr->features))
|
||||
vlan_hwaccel_receive_skb(skb, vgrp, vlan_tag);
|
||||
else
|
||||
vlan_hwaccel_rx(skb, vgrp, vlan_tag);
|
||||
}
|
||||
EXPORT_SYMBOL(lro_vlan_hwaccel_receive_frags);
|
||||
|
||||
void lro_flush_all(struct net_lro_mgr *lro_mgr)
|
||||
{
|
||||
int i;
|
||||
struct net_lro_desc *lro_desc = lro_mgr->lro_arr;
|
||||
|
||||
for (i = 0; i < lro_mgr->max_desc; i++) {
|
||||
if (lro_desc[i].active)
|
||||
lro_flush(lro_mgr, &lro_desc[i]);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(lro_flush_all);
|
||||
|
||||
void lro_flush_pkt(struct net_lro_mgr *lro_mgr,
|
||||
struct iphdr *iph, struct tcphdr *tcph)
|
||||
{
|
||||
struct net_lro_desc *lro_desc;
|
||||
|
||||
lro_desc = lro_get_desc(lro_mgr, lro_mgr->lro_arr, iph, tcph);
|
||||
if (lro_desc->active)
|
||||
lro_flush(lro_mgr, lro_desc);
|
||||
}
|
||||
EXPORT_SYMBOL(lro_flush_pkt);
|
||||
Loading…
Reference in New Issue