Linux kernel mirror (for testing)
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1/*
2 * Copyright (c) 2007-2012 Nicira, Inc.
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>
28
29#include "flow.h"
30#include "vport.h"
31
32#define DP_MAX_PORTS USHRT_MAX
33#define DP_VPORT_HASH_BUCKETS 1024
34
35#define SAMPLE_ACTION_DEPTH 3
36
37/**
38 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
39 * datapath.
40 * @n_hit: Number of received packets for which a matching flow was found in
41 * the flow table.
42 * @n_miss: Number of received packets that had no matching flow in the flow
43 * table. The sum of @n_hit and @n_miss is the number of packets that have
44 * been received by the datapath.
45 * @n_lost: Number of received packets that had no matching flow in the flow
46 * table that could not be sent to userspace (normally due to an overflow in
47 * one of the datapath's queues).
48 */
49struct dp_stats_percpu {
50 u64 n_hit;
51 u64 n_missed;
52 u64 n_lost;
53 struct u64_stats_sync sync;
54};
55
56/**
57 * struct datapath - datapath for flow-based packet switching
58 * @rcu: RCU callback head for deferred destruction.
59 * @list_node: Element in global 'dps' list.
60 * @n_flows: Number of flows currently in flow table.
61 * @table: Current flow table. Protected by genl_lock and RCU.
62 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
63 * RTNL and RCU.
64 * @stats_percpu: Per-CPU datapath statistics.
65 * @net: Reference to net namespace.
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 hlist_head *ports;
79
80 /* Stats. */
81 struct dp_stats_percpu __percpu *stats_percpu;
82
83#ifdef CONFIG_NET_NS
84 /* Network namespace ref. */
85 struct net *net;
86#endif
87};
88
89struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
90
91static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
92{
93 WARN_ON_ONCE(!rcu_read_lock_held());
94 return ovs_lookup_vport(dp, port_no);
95}
96
97static inline struct vport *ovs_vport_rtnl_rcu(const struct datapath *dp, int port_no)
98{
99 WARN_ON_ONCE(!rcu_read_lock_held() && !rtnl_is_locked());
100 return ovs_lookup_vport(dp, port_no);
101}
102
103static inline struct vport *ovs_vport_rtnl(const struct datapath *dp, int port_no)
104{
105 ASSERT_RTNL();
106 return ovs_lookup_vport(dp, port_no);
107}
108
109/**
110 * struct ovs_skb_cb - OVS data in skb CB
111 * @flow: The flow associated with this packet. May be %NULL if no flow.
112 */
113struct ovs_skb_cb {
114 struct sw_flow *flow;
115};
116#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
117
118/**
119 * struct dp_upcall - metadata to include with a packet to send to userspace
120 * @cmd: One of %OVS_PACKET_CMD_*.
121 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
122 * @userdata: If nonnull, its u64 value is extracted and passed to userspace as
123 * %OVS_PACKET_ATTR_USERDATA.
124 * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
125 * packet is sent and the packet is accounted in the datapath's @n_lost
126 * counter.
127 */
128struct dp_upcall_info {
129 u8 cmd;
130 const struct sw_flow_key *key;
131 const struct nlattr *userdata;
132 u32 portid;
133};
134
135static inline struct net *ovs_dp_get_net(struct datapath *dp)
136{
137 return read_pnet(&dp->net);
138}
139
140static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
141{
142 write_pnet(&dp->net, net);
143}
144
145extern struct notifier_block ovs_dp_device_notifier;
146extern struct genl_multicast_group ovs_dp_vport_multicast_group;
147
148void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
149void ovs_dp_detach_port(struct vport *);
150int ovs_dp_upcall(struct datapath *, struct sk_buff *,
151 const struct dp_upcall_info *);
152
153const char *ovs_dp_name(const struct datapath *dp);
154struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
155 u8 cmd);
156
157int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
158#endif /* datapath.h */