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>
36 #define DP_MAX_PORTS USHRT_MAX
37 #define DP_VPORT_HASH_BUCKETS 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 * @table: Current flow table. Protected by ovs_mutex and RCU.
65 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
67 * @stats_percpu: Per-CPU datapath statistics.
68 * @net: Reference to net namespace.
70 * Context: See the comment on locking at the top of datapath.c for additional
71 * locking information.
75 struct list_head list_node;
78 struct flow_table __rcu *table;
81 struct hlist_head *ports;
84 struct dp_stats_percpu __percpu *stats_percpu;
87 /* Network namespace ref. */
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 * @pkt_key: The flow information extracted from the packet. Must be nonnull.
96 * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the
97 * packet is not being tunneled.
98 * @ip_summed: Consistently stores L4 checksumming status across different
100 * @csum_start: Stores the offset from which to start checksumming independent
101 * of the transport header on all kernel versions.
102 * packet was not received on a tunnel.
103 * @vlan_tci: Provides a substitute for the skb->vlan_tci field on kernels
107 struct sw_flow *flow;
108 struct sw_flow_key *pkt_key;
109 struct ovs_key_ipv4_tunnel *tun_key;
110 #ifdef NEED_CSUM_NORMALIZE
111 enum csum_type ip_summed;
114 #ifdef NEED_VLAN_FIELD
118 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
121 * struct dp_upcall - metadata to include with a packet to send to userspace
122 * @cmd: One of %OVS_PACKET_CMD_*.
123 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
124 * @userdata: If nonnull, its variable-length value is passed to userspace as
125 * %OVS_PACKET_ATTR_USERDATA.
126 * @portid: Netlink PID to which packet should be sent. If @portid is 0 then no
127 * packet is sent and the packet is accounted in the datapath's @n_lost
130 struct dp_upcall_info {
132 const struct sw_flow_key *key;
133 const struct nlattr *userdata;
138 * struct ovs_net - Per net-namespace data for ovs.
139 * @dps: List of datapaths to enable dumping them all out.
140 * Protected by genl_mutex.
141 * @vport_net: Per network namespace data for vport.
144 struct list_head dps;
145 struct vport_net vport_net;
146 struct work_struct dp_notify_work;
149 extern int ovs_net_id;
151 void ovs_unlock(void);
153 #ifdef CONFIG_LOCKDEP
154 int lockdep_ovsl_is_held(void);
156 #define lockdep_ovsl_is_held() 1
159 #define ASSERT_OVSL() WARN_ON(unlikely(!lockdep_ovsl_is_held()))
160 #define ovsl_dereference(p) \
161 rcu_dereference_protected(p, lockdep_ovsl_is_held())
163 static inline struct net *ovs_dp_get_net(struct datapath *dp)
165 return read_pnet(&dp->net);
168 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
170 write_pnet(&dp->net, net);
173 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
175 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
177 WARN_ON_ONCE(!rcu_read_lock_held());
178 return ovs_lookup_vport(dp, port_no);
181 static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
183 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
184 return ovs_lookup_vport(dp, port_no);
187 static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
190 return ovs_lookup_vport(dp, port_no);
193 extern struct notifier_block ovs_dp_device_notifier;
194 extern struct genl_multicast_group ovs_dp_vport_multicast_group;
196 void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
197 void ovs_dp_detach_port(struct vport *);
198 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
199 const struct dp_upcall_info *);
201 const char *ovs_dp_name(const struct datapath *dp);
202 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 portid, u32 seq,
205 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
206 void ovs_dp_notify_wq(struct work_struct *work);
208 #define OVS_NLERR(fmt, ...) \
209 pr_info_once(fmt "netlink: ", ##__VA_ARGS__)
211 #endif /* datapath.h */