2 * Copyright (c) 2007-2015 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>
28 #include <net/net_namespace.h>
29 #include <net/ip_tunnels.h>
33 #include "flow_table.h"
36 #define DP_MAX_PORTS USHRT_MAX
37 #define DP_VPORT_HASH_BUCKETS 1024
39 #define SAMPLE_ACTION_DEPTH 3
42 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
44 * @n_hit: Number of received packets for which a matching flow was found in
46 * @n_miss: Number of received packets that had no matching flow in the flow
47 * table. The sum of @n_hit and @n_miss is the number of packets that have
48 * been received by the datapath.
49 * @n_lost: Number of received packets that had no matching flow in the flow
50 * table that could not be sent to userspace (normally due to an overflow in
51 * one of the datapath's queues).
52 * @n_mask_hit: Number of masks looked up for flow match.
53 * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked
56 struct dp_stats_percpu {
61 struct u64_stats_sync syncp;
65 * struct datapath - datapath for flow-based packet switching
66 * @rcu: RCU callback head for deferred destruction.
67 * @list_node: Element in global 'dps' list.
69 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
71 * @stats_percpu: Per-CPU datapath statistics.
72 * @net: Reference to net namespace.
74 * Context: See the comment on locking at the top of datapath.c for additional
75 * locking information.
79 struct list_head list_node;
82 struct flow_table table;
85 struct hlist_head *ports;
88 struct dp_stats_percpu __percpu *stats_percpu;
90 /* Network namespace ref. */
97 * struct ovs_skb_cb - OVS data in skb CB
98 * @input_vport: The original vport packet came in on. This value is cached
99 * when a packet is received by OVS.
102 struct vport *input_vport;
104 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
107 * struct dp_upcall - metadata to include with a packet to send to userspace
108 * @cmd: One of %OVS_PACKET_CMD_*.
109 * @userdata: If nonnull, its variable-length value is passed to userspace as
110 * %OVS_PACKET_ATTR_USERDATA.
111 * @portid: Netlink portid to which packet should be sent. If @portid is 0
112 * then no packet is sent and the packet is accounted in the datapath's @n_lost
114 * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY.
116 struct dp_upcall_info {
117 struct ip_tunnel_info *egress_tun_info;
118 const void *egress_tun_opts;
119 const struct nlattr *userdata;
120 const struct nlattr *actions;
127 * struct ovs_net - Per net-namespace data for ovs.
128 * @dps: List of datapaths to enable dumping them all out.
129 * Protected by genl_mutex.
132 struct list_head dps;
133 struct work_struct dp_notify_work;
136 extern int ovs_net_id;
138 void ovs_unlock(void);
140 #ifdef CONFIG_LOCKDEP
141 int lockdep_ovsl_is_held(void);
143 #define lockdep_ovsl_is_held() 1
146 #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held())
147 #define ovsl_dereference(p) \
148 rcu_dereference_protected(p, lockdep_ovsl_is_held())
149 #define rcu_dereference_ovsl(p) \
150 rcu_dereference_check(p, lockdep_ovsl_is_held())
152 static inline struct net *ovs_dp_get_net(const struct datapath *dp)
154 return rpl_read_pnet(&dp->net);
157 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
159 rpl_write_pnet(&dp->net, net);
162 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
164 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
166 WARN_ON_ONCE(!rcu_read_lock_held());
167 return ovs_lookup_vport(dp, port_no);
170 static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
172 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
173 return ovs_lookup_vport(dp, port_no);
176 static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
179 return ovs_lookup_vport(dp, port_no);
182 extern struct notifier_block ovs_dp_device_notifier;
183 extern struct genl_family dp_vport_genl_family;
184 extern struct genl_multicast_group ovs_dp_vport_multicast_group;
186 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);
187 void ovs_dp_detach_port(struct vport *);
188 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
189 const struct sw_flow_key *, const struct dp_upcall_info *);
191 const char *ovs_dp_name(const struct datapath *dp);
192 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
195 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
196 const struct sw_flow_actions *, struct sw_flow_key *);
198 void ovs_dp_notify_wq(struct work_struct *work);
200 int action_fifos_init(void);
201 void action_fifos_exit(void);
203 #define OVS_NLERR(logging_allowed, fmt, ...) \
205 if (logging_allowed && net_ratelimit()) \
206 pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \
208 #endif /* datapath.h */