2 * Copyright (c) 2007-2011 Nicira Networks.
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 <linux/version.h>
38 #define DP_MAX_PORTS 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).
53 struct dp_stats_percpu {
57 struct u64_stats_sync sync;
61 * struct datapath - datapath for flow-based packet switching
62 * @rcu: RCU callback head for deferred destruction.
63 * @list_node: Element in global 'dps' list.
64 * @ifobj: Represents /sys/class/net/<devname>/brif. Protected by RTNL.
65 * @n_flows: Number of flows currently in flow table.
66 * @table: Current flow table. Protected by genl_lock and RCU.
67 * @ports: Map from port number to &struct vport. %OVSP_LOCAL port
68 * always exists, other ports may be %NULL. Protected by RTNL and RCU.
69 * @port_list: List of all ports in @ports in arbitrary order. RTNL required
70 * to iterate or modify.
71 * @stats_percpu: Per-CPU datapath statistics.
73 * Context: See the comment on locking at the top of datapath.c for additional
74 * locking information.
78 struct list_head list_node;
82 struct flow_table __rcu *table;
85 struct vport __rcu *ports[DP_MAX_PORTS];
86 struct list_head port_list;
89 struct dp_stats_percpu __percpu *stats_percpu;
93 * struct ovs_skb_cb - OVS data in skb CB
94 * @flow: The flow associated with this packet. May be %NULL if no flow.
95 * @tun_id: ID of the tunnel that encapsulated this packet. It is 0 if the
96 * @ip_summed: Consistently stores L4 checksumming status across different
98 * @csum_start: Stores the offset from which to start checksumming independent
99 * of the transport header on all kernel versions.
100 * packet was not received on a tunnel.
101 * @vlan_tci: Provides a substitute for the skb->vlan_tci field on kernels
105 struct sw_flow *flow;
107 #ifdef NEED_CSUM_NORMALIZE
108 enum csum_type ip_summed;
111 #ifdef NEED_VLAN_FIELD
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 u64 value is extracted and 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 extern struct notifier_block ovs_dp_device_notifier;
135 extern struct genl_multicast_group ovs_dp_vport_multicast_group;
136 extern int (*ovs_dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
138 void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
139 void ovs_dp_detach_port(struct vport *);
140 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
141 const struct dp_upcall_info *);
143 const char *ovs_dp_name(const struct datapath *dp);
144 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
147 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
148 #endif /* datapath.h */