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Jesse Grossccb13522011-10-25 19:26:31 -07001/*
2 * Copyright (c) 2007-2011 Nicira Networks.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19#ifndef DATAPATH_H
20#define DATAPATH_H 1
21
22#include <asm/page.h>
23#include <linux/kernel.h>
24#include <linux/mutex.h>
25#include <linux/netdevice.h>
26#include <linux/skbuff.h>
27#include <linux/u64_stats_sync.h>
Jesse Grossccb13522011-10-25 19:26:31 -070028
29#include "flow.h"
30
31struct vport;
32
33#define DP_MAX_PORTS 1024
34#define SAMPLE_ACTION_DEPTH 3
35
36/**
37 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
38 * datapath.
39 * @n_hit: Number of received packets for which a matching flow was found in
40 * the flow table.
41 * @n_miss: Number of received packets that had no matching flow in the flow
42 * table. The sum of @n_hit and @n_miss is the number of packets that have
43 * been received by the datapath.
44 * @n_lost: Number of received packets that had no matching flow in the flow
45 * table that could not be sent to userspace (normally due to an overflow in
46 * one of the datapath's queues).
47 */
48struct dp_stats_percpu {
49 u64 n_hit;
50 u64 n_missed;
51 u64 n_lost;
52 struct u64_stats_sync sync;
53};
54
55/**
56 * struct datapath - datapath for flow-based packet switching
57 * @rcu: RCU callback head for deferred destruction.
58 * @list_node: Element in global 'dps' list.
59 * @n_flows: Number of flows currently in flow table.
60 * @table: Current flow table. Protected by genl_lock and RCU.
61 * @ports: Map from port number to &struct vport. %OVSP_LOCAL port
62 * always exists, other ports may be %NULL. Protected by RTNL and RCU.
63 * @port_list: List of all ports in @ports in arbitrary order. RTNL required
64 * to iterate or modify.
65 * @stats_percpu: Per-CPU datapath statistics.
66 *
67 * Context: See the comment on locking at the top of datapath.c for additional
68 * locking information.
69 */
70struct datapath {
71 struct rcu_head rcu;
72 struct list_head list_node;
73
74 /* Flow table. */
75 struct flow_table __rcu *table;
76
77 /* Switch ports. */
78 struct vport __rcu *ports[DP_MAX_PORTS];
79 struct list_head port_list;
80
81 /* Stats. */
82 struct dp_stats_percpu __percpu *stats_percpu;
83};
84
85/**
86 * struct ovs_skb_cb - OVS data in skb CB
87 * @flow: The flow associated with this packet. May be %NULL if no flow.
88 */
89struct ovs_skb_cb {
90 struct sw_flow *flow;
91};
92#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
93
94/**
95 * struct dp_upcall - metadata to include with a packet to send to userspace
96 * @cmd: One of %OVS_PACKET_CMD_*.
97 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
98 * @userdata: If nonnull, its u64 value is extracted and passed to userspace as
99 * %OVS_PACKET_ATTR_USERDATA.
100 * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
101 * packet is sent and the packet is accounted in the datapath's @n_lost
102 * counter.
103 */
104struct dp_upcall_info {
105 u8 cmd;
106 const struct sw_flow_key *key;
107 const struct nlattr *userdata;
108 u32 pid;
109};
110
111extern struct notifier_block ovs_dp_device_notifier;
112extern struct genl_multicast_group ovs_dp_vport_multicast_group;
113
114void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
115void ovs_dp_detach_port(struct vport *);
116int ovs_dp_upcall(struct datapath *, struct sk_buff *,
117 const struct dp_upcall_info *);
118
119const char *ovs_dp_name(const struct datapath *dp);
120struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
121 u8 cmd);
122
123int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
124#endif /* datapath.h */