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. */
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 * @pkt_key: The flow information extracted from the packet. Must be nonnull.
99 * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the
100 * packet is not being tunneled.
103 struct sw_flow *flow;
104 struct sw_flow_key *pkt_key;
105 struct ovs_key_ipv4_tunnel *tun_key;
107 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
110 * struct dp_upcall - metadata to include with a packet to send to userspace
111 * @cmd: One of %OVS_PACKET_CMD_*.
112 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
113 * @userdata: If nonnull, its variable-length value is passed to userspace as
114 * %OVS_PACKET_ATTR_USERDATA.
115 * @portid: Netlink PID to which packet should be sent. If @portid is 0 then no
116 * packet is sent and the packet is accounted in the datapath's @n_lost
119 struct dp_upcall_info {
121 const struct sw_flow_key *key;
122 const struct nlattr *userdata;
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.
130 * @vport_net: Per network namespace data for vport.
133 struct list_head dps;
134 struct vport_net vport_net;
135 struct work_struct dp_notify_work;
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(unlikely(!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_multicast_group ovs_dp_vport_multicast_group;
187 void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
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 portid, u32 seq,
196 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
197 void ovs_dp_notify_wq(struct work_struct *work);
199 #define OVS_NLERR(fmt, ...) \
200 pr_info_once("netlink: " fmt, ##__VA_ARGS__)
202 #endif /* datapath.h */