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>
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).
50 struct dp_stats_percpu {
54 struct u64_stats_sync sync;
58 * struct datapath - datapath for flow-based packet switching
59 * @rcu: RCU callback head for deferred destruction.
60 * @list_node: Element in global 'dps' list.
62 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
64 * @stats_percpu: Per-CPU datapath statistics.
65 * @net: Reference to net namespace.
67 * Context: See the comment on locking at the top of datapath.c for additional
68 * locking information.
72 struct list_head list_node;
75 struct flow_table table;
78 struct hlist_head *ports;
81 struct dp_stats_percpu __percpu *stats_percpu;
84 /* Network namespace ref. */
90 * struct ovs_skb_cb - OVS data in skb CB
91 * @flow: The flow associated with this packet. May be %NULL if no flow.
92 * @pkt_key: The flow information extracted from the packet. Must be nonnull.
93 * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the
94 * packet is not being tunneled.
98 struct sw_flow_key *pkt_key;
99 struct ovs_key_ipv4_tunnel *tun_key;
101 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
104 * struct dp_upcall - metadata to include with a packet to send to userspace
105 * @cmd: One of %OVS_PACKET_CMD_*.
106 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
107 * @userdata: If nonnull, its variable-length value is passed to userspace as
108 * %OVS_PACKET_ATTR_USERDATA.
109 * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
110 * packet is sent and the packet is accounted in the datapath's @n_lost
113 struct dp_upcall_info {
115 const struct sw_flow_key *key;
116 const struct nlattr *userdata;
121 * struct ovs_net - Per net-namespace data for ovs.
122 * @dps: List of datapaths to enable dumping them all out.
123 * Protected by genl_mutex.
126 struct list_head dps;
127 struct work_struct dp_notify_work;
128 struct vport_net vport_net;
131 extern int ovs_net_id;
133 void ovs_unlock(void);
135 #ifdef CONFIG_LOCKDEP
136 int lockdep_ovsl_is_held(void);
138 #define lockdep_ovsl_is_held() 1
141 #define ASSERT_OVSL() WARN_ON(unlikely(!lockdep_ovsl_is_held()))
142 #define ovsl_dereference(p) \
143 rcu_dereference_protected(p, lockdep_ovsl_is_held())
145 static inline struct net *ovs_dp_get_net(struct datapath *dp)
147 return read_pnet(&dp->net);
150 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
152 write_pnet(&dp->net, net);
155 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
157 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
159 WARN_ON_ONCE(!rcu_read_lock_held());
160 return ovs_lookup_vport(dp, port_no);
163 static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
165 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
166 return ovs_lookup_vport(dp, port_no);
169 static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
172 return ovs_lookup_vport(dp, port_no);
175 extern struct notifier_block ovs_dp_device_notifier;
176 extern struct genl_multicast_group ovs_dp_vport_multicast_group;
178 void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
179 void ovs_dp_detach_port(struct vport *);
180 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
181 const struct dp_upcall_info *);
183 const char *ovs_dp_name(const struct datapath *dp);
184 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
187 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
188 void ovs_dp_notify_wq(struct work_struct *work);
190 #define OVS_NLERR(fmt, ...) \
191 pr_info_once("netlink: " fmt, ##__VA_ARGS__)
193 #endif /* datapath.h */