2 * Copyright (c) 2007-2012 Nicira, Inc.
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.
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.
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
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>
31 #include "flow_table.h"
35 #define DP_MAX_PORTS USHRT_MAX
36 #define DP_VPORT_HASH_BUCKETS 1024
38 #define SAMPLE_ACTION_DEPTH 3
41 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
43 * @n_hit: Number of received packets for which a matching flow was found in
45 * @n_miss: Number of received packets that had no matching flow in the flow
46 * table. The sum of @n_hit and @n_miss is the number of packets that have
47 * been received by the datapath.
48 * @n_lost: Number of received packets that had no matching flow in the flow
49 * table that could not be sent to userspace (normally due to an overflow in
50 * one of the datapath's queues).
51 * @n_mask_hit: Number of masks looked up for flow match.
52 * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked
55 struct dp_stats_percpu {
60 struct u64_stats_sync sync;
64 * struct datapath - datapath for flow-based packet switching
65 * @rcu: RCU callback head for deferred destruction.
66 * @list_node: Element in global 'dps' list.
68 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
70 * @stats_percpu: Per-CPU datapath statistics.
71 * @net: Reference to net namespace.
73 * Context: See the comment on locking at the top of datapath.c for additional
74 * locking information.
78 struct list_head list_node;
81 struct flow_table table;
84 struct hlist_head *ports;
87 struct dp_stats_percpu __percpu *stats_percpu;
90 /* Network namespace ref. */
98 * struct ovs_skb_cb - OVS data in skb CB
99 * @flow: The flow associated with this packet. May be %NULL if no flow.
100 * @pkt_key: The flow information extracted from the packet. Must be nonnull.
101 * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the
102 * packet is not being tunneled.
105 struct sw_flow *flow;
106 struct sw_flow_key *pkt_key;
107 struct ovs_key_ipv4_tunnel *tun_key;
109 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
112 * struct dp_upcall - metadata to include with a packet to send to userspace
113 * @cmd: One of %OVS_PACKET_CMD_*.
114 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
115 * @userdata: If nonnull, its variable-length value is passed to userspace as
116 * %OVS_PACKET_ATTR_USERDATA.
117 * @portid: Netlink PID to which packet should be sent. If @portid is 0 then no
118 * packet is sent and the packet is accounted in the datapath's @n_lost
121 struct dp_upcall_info {
123 const struct sw_flow_key *key;
124 const struct nlattr *userdata;
129 * struct ovs_net - Per net-namespace data for ovs.
130 * @dps: List of datapaths to enable dumping them all out.
131 * Protected by genl_mutex.
132 * @vport_net: Per network namespace data for vport.
135 struct list_head dps;
136 struct vport_net vport_net;
137 struct work_struct dp_notify_work;
140 extern int ovs_net_id;
142 void ovs_unlock(void);
144 #ifdef CONFIG_LOCKDEP
145 int lockdep_ovsl_is_held(void);
147 #define lockdep_ovsl_is_held() 1
150 #define ASSERT_OVSL() WARN_ON(unlikely(!lockdep_ovsl_is_held()))
151 #define ovsl_dereference(p) \
152 rcu_dereference_protected(p, lockdep_ovsl_is_held())
153 #define rcu_dereference_ovsl(p) \
154 rcu_dereference_check(p, lockdep_ovsl_is_held())
156 static inline struct net *ovs_dp_get_net(struct datapath *dp)
158 return read_pnet(&dp->net);
161 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
163 write_pnet(&dp->net, net);
166 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
168 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
170 WARN_ON_ONCE(!rcu_read_lock_held());
171 return ovs_lookup_vport(dp, port_no);
174 static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
176 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
177 return ovs_lookup_vport(dp, port_no);
180 static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
183 return ovs_lookup_vport(dp, port_no);
186 extern struct notifier_block ovs_dp_device_notifier;
187 extern struct genl_multicast_group ovs_dp_vport_multicast_group;
189 void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
190 void ovs_dp_detach_port(struct vport *);
191 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
192 const struct dp_upcall_info *);
194 const char *ovs_dp_name(const struct datapath *dp);
195 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 portid, u32 seq,
198 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
199 void ovs_dp_notify_wq(struct work_struct *work);
201 #define OVS_NLERR(fmt, ...) \
203 if (net_ratelimit()) \
204 pr_info("netlink: " fmt, ##__VA_ARGS__); \
206 #endif /* datapath.h */