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>
32 #define DP_MAX_PORTS USHRT_MAX
33 #define DP_VPORT_HASH_BUCKETS 1024
35 #define SAMPLE_ACTION_DEPTH 3
38 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
40 * @n_hit: Number of received packets for which a matching flow was found in
42 * @n_miss: Number of received packets that had no matching flow in the flow
43 * table. The sum of @n_hit and @n_miss is the number of packets that have
44 * been received by the datapath.
45 * @n_lost: Number of received packets that had no matching flow in the flow
46 * table that could not be sent to userspace (normally due to an overflow in
47 * one of the datapath's queues).
49 struct dp_stats_percpu {
53 struct u64_stats_sync sync;
57 * struct datapath - datapath for flow-based packet switching
58 * @rcu: RCU callback head for deferred destruction.
59 * @list_node: Element in global 'dps' list.
60 * @table: Current flow table. Protected by genl_lock and RCU.
61 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
63 * @stats_percpu: Per-CPU datapath statistics.
64 * @net: Reference to net namespace.
66 * Context: See the comment on locking at the top of datapath.c for additional
67 * locking information.
71 struct list_head list_node;
74 struct flow_table __rcu *table;
77 struct hlist_head *ports;
80 struct dp_stats_percpu __percpu *stats_percpu;
83 /* Network namespace ref. */
88 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
90 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
92 WARN_ON_ONCE(!rcu_read_lock_held());
93 return ovs_lookup_vport(dp, port_no);
96 static inline struct vport *ovs_vport_rtnl_rcu(const struct datapath *dp, int port_no)
98 WARN_ON_ONCE(!rcu_read_lock_held() && !rtnl_is_locked());
99 return ovs_lookup_vport(dp, port_no);
102 static inline struct vport *ovs_vport_rtnl(const struct datapath *dp, int port_no)
105 return ovs_lookup_vport(dp, port_no);
109 * struct ovs_skb_cb - OVS data in skb CB
110 * @flow: The flow associated with this packet. May be %NULL if no flow.
113 struct sw_flow *flow;
115 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
118 * struct dp_upcall - metadata to include with a packet to send to userspace
119 * @cmd: One of %OVS_PACKET_CMD_*.
120 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
121 * @userdata: If nonnull, its variable-length value is passed to userspace as
122 * %OVS_PACKET_ATTR_USERDATA.
123 * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
124 * packet is sent and the packet is accounted in the datapath's @n_lost
127 struct dp_upcall_info {
129 const struct sw_flow_key *key;
130 const struct nlattr *userdata;
134 static inline struct net *ovs_dp_get_net(struct datapath *dp)
136 return read_pnet(&dp->net);
139 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
141 write_pnet(&dp->net, net);
144 extern struct notifier_block ovs_dp_device_notifier;
145 extern struct genl_multicast_group ovs_dp_vport_multicast_group;
147 void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
148 void ovs_dp_detach_port(struct vport *);
149 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
150 const struct dp_upcall_info *);
152 const char *ovs_dp_name(const struct datapath *dp);
153 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
156 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
157 #endif /* datapath.h */