Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 */
92struct ovs_skb_cb {
93 struct sw_flow *flow;
94};
95#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
96
97/**
98 * struct dp_upcall - metadata to include with a packet to send to userspace
99 * @cmd: One of %OVS_PACKET_CMD_*.
100 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
101 * @userdata: If nonnull, its variable-length value is passed to userspace as
102 * %OVS_PACKET_ATTR_USERDATA.
103 * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
104 * packet is sent and the packet is accounted in the datapath's @n_lost
105 * counter.
106 */
107struct dp_upcall_info {
108 u8 cmd;
109 const struct sw_flow_key *key;
110 const struct nlattr *userdata;
111 u32 portid;
112};
113
114/**
115 * struct ovs_net - Per net-namespace data for ovs.
116 * @dps: List of datapaths to enable dumping them all out.
117 * Protected by genl_mutex.
118 */
119struct ovs_net {
120 struct list_head dps;
121 struct work_struct dp_notify_work;
122};
123
124extern int ovs_net_id;
125void ovs_lock(void);
126void ovs_unlock(void);
127
128#ifdef CONFIG_LOCKDEP
129int lockdep_ovsl_is_held(void);
130#else
131#define lockdep_ovsl_is_held() 1
132#endif
133
134#define ASSERT_OVSL() WARN_ON(unlikely(!lockdep_ovsl_is_held()))
135#define ovsl_dereference(p) \
136 rcu_dereference_protected(p, lockdep_ovsl_is_held())
137
138static inline struct net *ovs_dp_get_net(struct datapath *dp)
139{
140 return read_pnet(&dp->net);
141}
142
143static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
144{
145 write_pnet(&dp->net, net);
146}
147
148struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
149
150static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
151{
152 WARN_ON_ONCE(!rcu_read_lock_held());
153 return ovs_lookup_vport(dp, port_no);
154}
155
156static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
157{
158 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
159 return ovs_lookup_vport(dp, port_no);
160}
161
162static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
163{
164 ASSERT_OVSL();
165 return ovs_lookup_vport(dp, port_no);
166}
167
168extern struct notifier_block ovs_dp_device_notifier;
169extern struct genl_multicast_group ovs_dp_vport_multicast_group;
170
171void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
172void ovs_dp_detach_port(struct vport *);
173int ovs_dp_upcall(struct datapath *, struct sk_buff *,
174 const struct dp_upcall_info *);
175
176const char *ovs_dp_name(const struct datapath *dp);
177struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
178 u8 cmd);
179
180int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
181void ovs_dp_notify_wq(struct work_struct *work);
182#endif /* datapath.h */