2 * Copyright (c) 2007-2012 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>
37 #define DP_MAX_PORTS 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).
52 struct dp_stats_percpu {
56 struct u64_stats_sync sync;
60 * struct datapath - datapath for flow-based packet switching
61 * @rcu: RCU callback head for deferred destruction.
62 * @list_node: Element in global 'dps' list.
63 * @ifobj: Represents /sys/class/net/<devname>/brif. Protected by RTNL.
64 * @n_flows: Number of flows currently in flow table.
65 * @table: Current flow table. Protected by genl_lock and RCU.
66 * @ports: Map from port number to &struct vport. %OVSP_LOCAL port
67 * always exists, other ports may be %NULL. Protected by RTNL and RCU.
68 * @port_list: List of all ports in @ports in arbitrary order. RTNL required
69 * to iterate or modify.
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;
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;
92 /* Network namespace ref. */
98 * struct ovs_skb_cb - OVS data in skb CB
99 * @flow: The flow associated with this packet. May be %NULL if no flow.
100 * @tun_id: ID of the tunnel that encapsulated this packet. It is 0 if the
101 * @ip_summed: Consistently stores L4 checksumming status across different
103 * @csum_start: Stores the offset from which to start checksumming independent
104 * of the transport header on all kernel versions.
105 * packet was not received on a tunnel.
106 * @vlan_tci: Provides a substitute for the skb->vlan_tci field on kernels
110 struct sw_flow *flow;
112 #ifdef NEED_CSUM_NORMALIZE
113 enum csum_type ip_summed;
116 #ifdef NEED_VLAN_FIELD
120 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
123 * struct dp_upcall - metadata to include with a packet to send to userspace
124 * @cmd: One of %OVS_PACKET_CMD_*.
125 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
126 * @userdata: If nonnull, its u64 value is extracted and passed to userspace as
127 * %OVS_PACKET_ATTR_USERDATA.
128 * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
129 * packet is sent and the packet is accounted in the datapath's @n_lost
132 struct dp_upcall_info {
134 const struct sw_flow_key *key;
135 const struct nlattr *userdata;
140 * struct ovs_net - Per net-namespace data for ovs.
141 * @dps: List of datapaths to enable dumping them all out.
142 * Protected by genl_mutex.
143 * @vport_net: Per network namespace data for vport.
146 struct list_head dps;
147 struct vport_net vport_net;
150 extern int ovs_net_id;
152 static inline struct net *ovs_dp_get_net(struct datapath *dp)
154 return read_pnet(&dp->net);
157 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
159 write_pnet(&dp->net, net);
162 extern struct notifier_block ovs_dp_device_notifier;
163 extern struct genl_multicast_group ovs_dp_vport_multicast_group;
164 extern int (*ovs_dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
166 void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
167 void ovs_dp_detach_port(struct vport *);
168 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
169 const struct dp_upcall_info *);
171 const char *ovs_dp_name(const struct datapath *dp);
172 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
175 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
176 #endif /* datapath.h */