211 lines
6.4 KiB
C
211 lines
6.4 KiB
C
/*
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* Copyright (c) 2007-2012 Nicira, Inc.
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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 version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#ifndef VPORT_H
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#define VPORT_H 1
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#include <linux/if_tunnel.h>
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#include <linux/list.h>
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#include <linux/netlink.h>
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#include <linux/openvswitch.h>
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#include <linux/reciprocal_div.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/u64_stats_sync.h>
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#include "datapath.h"
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struct vport;
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struct vport_parms;
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/* The following definitions are for users of the vport subsytem: */
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int ovs_vport_init(void);
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void ovs_vport_exit(void);
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struct vport *ovs_vport_add(const struct vport_parms *);
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void ovs_vport_del(struct vport *);
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struct vport *ovs_vport_locate(const struct net *net, const char *name);
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void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *);
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int ovs_vport_set_options(struct vport *, struct nlattr *options);
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int ovs_vport_get_options(const struct vport *, struct sk_buff *);
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int ovs_vport_set_upcall_portids(struct vport *, const struct nlattr *pids);
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int ovs_vport_get_upcall_portids(const struct vport *, struct sk_buff *);
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u32 ovs_vport_find_upcall_portid(const struct vport *, struct sk_buff *);
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/**
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* struct vport_portids - array of netlink portids of a vport.
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* must be protected by rcu.
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* @rn_ids: The reciprocal value of @n_ids.
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* @rcu: RCU callback head for deferred destruction.
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* @n_ids: Size of @ids array.
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* @ids: Array storing the Netlink socket pids to be used for packets received
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* on this port that miss the flow table.
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*/
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struct vport_portids {
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struct reciprocal_value rn_ids;
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struct rcu_head rcu;
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u32 n_ids;
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u32 ids[];
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};
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/**
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* struct vport - one port within a datapath
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* @dev: Pointer to net_device.
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* @dp: Datapath to which this port belongs.
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* @upcall_portids: RCU protected 'struct vport_portids'.
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* @port_no: Index into @dp's @ports array.
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* @hash_node: Element in @dev_table hash table in vport.c.
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* @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
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* @ops: Class structure.
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* @detach_list: list used for detaching vport in net-exit call.
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* @rcu: RCU callback head for deferred destruction.
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*/
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struct vport {
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struct net_device *dev;
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struct datapath *dp;
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struct vport_portids __rcu *upcall_portids;
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u16 port_no;
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struct hlist_node hash_node;
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struct hlist_node dp_hash_node;
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const struct vport_ops *ops;
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struct list_head detach_list;
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struct rcu_head rcu;
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};
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/**
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* struct vport_parms - parameters for creating a new vport
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*
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* @name: New vport's name.
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* @type: New vport's type.
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* @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if
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* none was supplied.
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* @dp: New vport's datapath.
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* @port_no: New vport's port number.
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*/
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struct vport_parms {
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const char *name;
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enum ovs_vport_type type;
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struct nlattr *options;
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/* For ovs_vport_alloc(). */
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struct datapath *dp;
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u16 port_no;
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struct nlattr *upcall_portids;
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};
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/**
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* struct vport_ops - definition of a type of virtual port
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*
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* @type: %OVS_VPORT_TYPE_* value for this type of virtual port.
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* @create: Create a new vport configured as specified. On success returns
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* a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value.
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* @destroy: Destroys a vport. Must call vport_free() on the vport but not
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* before an RCU grace period has elapsed.
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* @set_options: Modify the configuration of an existing vport. May be %NULL
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* if modification is not supported.
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* @get_options: Appends vport-specific attributes for the configuration of an
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* existing vport to a &struct sk_buff. May be %NULL for a vport that does not
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* have any configuration.
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* @send: Send a packet on the device.
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* zero for dropped packets or negative for error.
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*/
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struct vport_ops {
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enum ovs_vport_type type;
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/* Called with ovs_mutex. */
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struct vport *(*create)(const struct vport_parms *);
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void (*destroy)(struct vport *);
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int (*set_options)(struct vport *, struct nlattr *);
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int (*get_options)(const struct vport *, struct sk_buff *);
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netdev_tx_t (*send) (struct sk_buff *skb);
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struct module *owner;
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struct list_head list;
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};
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struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *,
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const struct vport_parms *);
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void ovs_vport_free(struct vport *);
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void ovs_vport_deferred_free(struct vport *vport);
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#define VPORT_ALIGN 8
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/**
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* vport_priv - access private data area of vport
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*
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* @vport: vport to access
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*
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* If a nonzero size was passed in priv_size of vport_alloc() a private data
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* area was allocated on creation. This allows that area to be accessed and
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* used for any purpose needed by the vport implementer.
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*/
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static inline void *vport_priv(const struct vport *vport)
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{
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return (u8 *)(uintptr_t)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN);
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}
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/**
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* vport_from_priv - lookup vport from private data pointer
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*
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* @priv: Start of private data area.
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*
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* It is sometimes useful to translate from a pointer to the private data
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* area to the vport, such as in the case where the private data pointer is
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* the result of a hash table lookup. @priv must point to the start of the
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* private data area.
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*/
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static inline struct vport *vport_from_priv(void *priv)
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{
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return (struct vport *)((u8 *)priv - ALIGN(sizeof(struct vport), VPORT_ALIGN));
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}
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int ovs_vport_receive(struct vport *, struct sk_buff *,
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const struct ip_tunnel_info *);
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static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb,
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const void *start, unsigned int len)
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{
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if (skb->ip_summed == CHECKSUM_COMPLETE)
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skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));
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}
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static inline const char *ovs_vport_name(struct vport *vport)
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{
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return vport->dev->name;
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}
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int __ovs_vport_ops_register(struct vport_ops *ops);
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#define ovs_vport_ops_register(ops) \
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({ \
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(ops)->owner = THIS_MODULE; \
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__ovs_vport_ops_register(ops); \
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})
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void ovs_vport_ops_unregister(struct vport_ops *ops);
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void ovs_vport_send(struct vport *vport, struct sk_buff *skb);
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#endif /* vport.h */
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