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>
37 #define DP_MAX_PORTS USHRT_MAX
38 #define DP_VPORT_HASH_BUCKETS 1024
40 #define SAMPLE_ACTION_DEPTH 3
43 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
45 * @n_hit: Number of received packets for which a matching flow was found in
47 * @n_miss: Number of received packets that had no matching flow in the flow
48 * table. The sum of @n_hit and @n_miss is the number of packets that have
49 * been received by the datapath.
50 * @n_lost: Number of received packets that had no matching flow in the flow
51 * table that could not be sent to userspace (normally due to an overflow in
52 * one of the datapath's queues).
54 struct dp_stats_percpu {
58 struct u64_stats_sync sync;
62 * struct datapath - datapath for flow-based packet switching
63 * @rcu: RCU callback head for deferred destruction.
64 * @list_node: Element in global 'dps' list.
65 * @ifobj: Represents /sys/class/net/<devname>/brif. Protected by RTNL.
66 * @n_flows: Number of flows currently in flow table.
67 * @table: Current flow table. Protected by genl_lock and RCU.
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;
82 struct flow_table __rcu *table;
85 struct hlist_head *ports;
88 struct dp_stats_percpu __percpu *stats_percpu;
91 /* Network namespace ref. */
97 * struct ovs_skb_cb - OVS data in skb CB
98 * @flow: The flow associated with this packet. May be %NULL if no flow.
99 * @tun_id: ID of the tunnel that encapsulated this packet. It is 0 if the
100 * @ip_summed: Consistently stores L4 checksumming status across different
102 * @csum_start: Stores the offset from which to start checksumming independent
103 * of the transport header on all kernel versions.
104 * packet was not received on a tunnel.
105 * @vlan_tci: Provides a substitute for the skb->vlan_tci field on kernels
109 struct sw_flow *flow;
111 #ifdef NEED_CSUM_NORMALIZE
112 enum csum_type ip_summed;
115 #ifdef NEED_VLAN_FIELD
119 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
122 * struct dp_upcall - metadata to include with a packet to send to userspace
123 * @cmd: One of %OVS_PACKET_CMD_*.
124 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
125 * @userdata: If nonnull, its u64 value is extracted and passed to userspace as
126 * %OVS_PACKET_ATTR_USERDATA.
127 * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
128 * packet is sent and the packet is accounted in the datapath's @n_lost
131 struct dp_upcall_info {
133 const struct sw_flow_key *key;
134 const struct nlattr *userdata;
139 * struct ovs_net - Per net-namespace data for ovs.
140 * @dps: List of datapaths to enable dumping them all out.
141 * Protected by genl_mutex.
142 * @vport_net: Per network namespace data for vport.
145 struct list_head dps;
146 struct vport_net vport_net;
149 extern int ovs_net_id;
151 static inline struct net *ovs_dp_get_net(struct datapath *dp)
153 return read_pnet(&dp->net);
156 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
158 write_pnet(&dp->net, net);
161 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
163 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
165 WARN_ON_ONCE(!rcu_read_lock_held());
166 return ovs_lookup_vport(dp, port_no);
169 static inline struct vport *ovs_vport_rtnl_rcu(const struct datapath *dp, int port_no)
171 WARN_ON_ONCE(!rcu_read_lock_held() && !rtnl_is_locked());
172 return ovs_lookup_vport(dp, port_no);
175 static inline struct vport *ovs_vport_rtnl(const struct datapath *dp, int port_no)
178 return ovs_lookup_vport(dp, port_no);
181 extern struct notifier_block ovs_dp_device_notifier;
182 extern struct genl_multicast_group ovs_dp_vport_multicast_group;
183 extern int (*ovs_dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
185 void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
186 void ovs_dp_detach_port(struct vport *);
187 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
188 const struct dp_upcall_info *);
190 const char *ovs_dp_name(const struct datapath *dp);
191 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
194 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
195 #endif /* datapath.h */