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 * @table: Current flow table. Protected by ovs_mutex and RCU.
61 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
62 * ovs_mutex and RCU.
63 * @stats_percpu: Per-CPU datapath statistics.
64 * @net: Reference to net namespace.
65 *
66 * Context: See the comment on locking at the top of datapath.c for additional
67 * locking information.
68 */
69struct datapath {
70 struct rcu_head rcu;
71 struct list_head list_node;
72
73 /* Flow table. */
74 struct flow_table __rcu *table;
75
76 /* Switch ports. */
77 struct hlist_head *ports;
78
79 /* Stats. */
80 struct dp_stats_percpu __percpu *stats_percpu;
81
82#ifdef CONFIG_NET_NS
83 /* Network namespace ref. */
84 struct net *net;
85#endif
86};
87
88/**
89 * struct ovs_skb_cb - OVS data in skb CB
90 * @flow: The flow associated with this packet. May be %NULL if no flow.
91 * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the
92 * packet is not being tunneled.
93 */
94struct ovs_skb_cb {
95 struct sw_flow *flow;
96 struct ovs_key_ipv4_tunnel *tun_key;
97};
98#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
99
100/**
101 * struct dp_upcall - metadata to include with a packet to send to userspace
102 * @cmd: One of %OVS_PACKET_CMD_*.
103 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
104 * @userdata: If nonnull, its variable-length value is passed to userspace as
105 * %OVS_PACKET_ATTR_USERDATA.
106 * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
107 * packet is sent and the packet is accounted in the datapath's @n_lost
108 * counter.
109 */
110struct dp_upcall_info {
111 u8 cmd;
112 const struct sw_flow_key *key;
113 const struct nlattr *userdata;
114 u32 portid;
115};
116
117/**
118 * struct ovs_net - Per net-namespace data for ovs.
119 * @dps: List of datapaths to enable dumping them all out.
120 * Protected by genl_mutex.
121 */
122struct ovs_net {
123 struct list_head dps;
124 struct work_struct dp_notify_work;
125 struct vport_net vport_net;
126};
127
128extern int ovs_net_id;
129void ovs_lock(void);
130void ovs_unlock(void);
131
132#ifdef CONFIG_LOCKDEP
133int lockdep_ovsl_is_held(void);
134#else
135#define lockdep_ovsl_is_held() 1
136#endif
137
138#define ASSERT_OVSL() WARN_ON(unlikely(!lockdep_ovsl_is_held()))
139#define ovsl_dereference(p) \
140 rcu_dereference_protected(p, lockdep_ovsl_is_held())
141
142static inline struct net *ovs_dp_get_net(struct datapath *dp)
143{
144 return read_pnet(&dp->net);
145}
146
147static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
148{
149 write_pnet(&dp->net, net);
150}
151
152struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
153
154static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
155{
156 WARN_ON_ONCE(!rcu_read_lock_held());
157 return ovs_lookup_vport(dp, port_no);
158}
159
160static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
161{
162 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
163 return ovs_lookup_vport(dp, port_no);
164}
165
166static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
167{
168 ASSERT_OVSL();
169 return ovs_lookup_vport(dp, port_no);
170}
171
172extern struct notifier_block ovs_dp_device_notifier;
173extern struct genl_multicast_group ovs_dp_vport_multicast_group;
174
175void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
176void ovs_dp_detach_port(struct vport *);
177int ovs_dp_upcall(struct datapath *, struct sk_buff *,
178 const struct dp_upcall_info *);
179
180const char *ovs_dp_name(const struct datapath *dp);
181struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
182 u8 cmd);
183
184int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
185void ovs_dp_notify_wq(struct work_struct *work);
186#endif /* datapath.h */