2 * Copyright (c) 2007-2014 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>
30 #include "flow_table.h"
33 #define DP_MAX_PORTS USHRT_MAX
34 #define DP_VPORT_HASH_BUCKETS 1024
36 #define SAMPLE_ACTION_DEPTH 3
39 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
41 * @n_hit: Number of received packets for which a matching flow was found in
43 * @n_miss: Number of received packets that had no matching flow in the flow
44 * table. The sum of @n_hit and @n_miss is the number of packets that have
45 * been received by the datapath.
46 * @n_lost: Number of received packets that had no matching flow in the flow
47 * table that could not be sent to userspace (normally due to an overflow in
48 * one of the datapath's queues).
49 * @n_mask_hit: Number of masks looked up for flow match.
50 * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked
53 struct dp_stats_percpu {
58 struct u64_stats_sync syncp;
62 * struct datapath - datapath for flow-based packet switching
63 * @rcu: RCU callback head for deferred destruction.
64 * @list_node: Element in global 'dps' list.
66 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
68 * @stats_percpu: Per-CPU datapath statistics.
69 * @net: Reference to net namespace.
71 * Context: See the comment on locking at the top of datapath.c for additional
72 * locking information.
76 struct list_head list_node;
79 struct flow_table table;
82 struct hlist_head *ports;
85 struct dp_stats_percpu __percpu *stats_percpu;
88 /* Network namespace ref. */
96 * struct ovs_skb_cb - OVS data in skb CB
97 * @flow: The flow associated with this packet. May be %NULL if no flow.
98 * @egress_tun_key: Tunnel information about this packet on egress path.
99 * NULL if the packet is not being tunneled.
100 * @input_vport: The original vport packet came in on. This value is cached
101 * when a packet is received by OVS.
104 struct sw_flow *flow;
105 struct ovs_tunnel_info *egress_tun_info;
106 struct vport *input_vport;
108 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
111 * struct dp_upcall - metadata to include with a packet to send to userspace
112 * @cmd: One of %OVS_PACKET_CMD_*.
113 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
114 * @userdata: If nonnull, its variable-length value is passed to userspace as
115 * %OVS_PACKET_ATTR_USERDATA.
116 * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
117 * packet is sent and the packet is accounted in the datapath's @n_lost
120 struct dp_upcall_info {
122 const struct sw_flow_key *key;
123 const struct nlattr *userdata;
128 * struct ovs_net - Per net-namespace data for ovs.
129 * @dps: List of datapaths to enable dumping them all out.
130 * Protected by genl_mutex.
133 struct list_head dps;
134 struct work_struct dp_notify_work;
135 struct vport_net vport_net;
138 extern int ovs_net_id;
140 void ovs_unlock(void);
142 #ifdef CONFIG_LOCKDEP
143 int lockdep_ovsl_is_held(void);
145 #define lockdep_ovsl_is_held() 1
148 #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held())
149 #define ovsl_dereference(p) \
150 rcu_dereference_protected(p, lockdep_ovsl_is_held())
151 #define rcu_dereference_ovsl(p) \
152 rcu_dereference_check(p, lockdep_ovsl_is_held())
154 static inline struct net *ovs_dp_get_net(struct datapath *dp)
156 return read_pnet(&dp->net);
159 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
161 write_pnet(&dp->net, net);
164 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
166 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
168 WARN_ON_ONCE(!rcu_read_lock_held());
169 return ovs_lookup_vport(dp, port_no);
172 static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
174 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
175 return ovs_lookup_vport(dp, port_no);
178 static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
181 return ovs_lookup_vport(dp, port_no);
184 extern struct notifier_block ovs_dp_device_notifier;
185 extern struct genl_family dp_vport_genl_family;
187 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);
188 void ovs_dp_detach_port(struct vport *);
189 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
190 const struct dp_upcall_info *);
192 const char *ovs_dp_name(const struct datapath *dp);
193 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
196 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
197 struct sw_flow_key *);
199 void ovs_dp_notify_wq(struct work_struct *work);
201 int action_fifos_init(void);
202 void action_fifos_exit(void);
204 #define OVS_NLERR(fmt, ...) \
206 if (net_ratelimit()) \
207 pr_info("netlink: " fmt, ##__VA_ARGS__); \
209 #endif /* datapath.h */