2 * Copyright (c) 2007-2014 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>
28 #include <net/ip_tunnels.h>
30 #include "conntrack.h"
32 #include "flow_table.h"
35 #define DP_MAX_PORTS USHRT_MAX
36 #define DP_VPORT_HASH_BUCKETS 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).
51 * @n_mask_hit: Number of masks looked up for flow match.
52 * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked
55 struct dp_stats_percpu {
60 struct u64_stats_sync syncp;
64 * struct datapath - datapath for flow-based packet switching
65 * @rcu: RCU callback head for deferred destruction.
66 * @list_node: Element in global 'dps' list.
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;
81 struct flow_table table;
84 struct hlist_head *ports;
87 struct dp_stats_percpu __percpu *stats_percpu;
89 /* Network namespace ref. */
96 * struct ovs_skb_cb - OVS data in skb CB
97 * @egress_tun_key: Tunnel information about this packet on egress path.
98 * NULL if the packet is not being tunneled.
99 * @input_vport: The original vport packet came in on. This value is cached
100 * when a packet is received by OVS.
101 * @mru: The maximum received fragement size; 0 if the packet is not
105 struct ip_tunnel_info *egress_tun_info;
106 struct vport *input_vport;
109 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
112 * struct dp_upcall - metadata to include with a packet to send to userspace
113 * @cmd: One of %OVS_PACKET_CMD_*.
114 * @userdata: If nonnull, its variable-length value is passed to userspace as
115 * %OVS_PACKET_ATTR_USERDATA.
116 * @portid: Netlink portid to which packet should be sent. If @portid is 0
117 * then no packet is sent and the packet is accounted in the datapath's @n_lost
119 * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY.
120 * @mru: If not zero, Maximum received IP fragment size.
122 struct dp_upcall_info {
123 const struct ip_tunnel_info *egress_tun_info;
124 const struct nlattr *userdata;
125 const struct nlattr *actions;
133 * struct ovs_net - Per net-namespace data for ovs.
134 * @dps: List of datapaths to enable dumping them all out.
135 * Protected by genl_mutex.
138 struct list_head dps;
139 struct work_struct dp_notify_work;
140 struct vport_net vport_net;
143 extern int ovs_net_id;
145 void ovs_unlock(void);
147 #ifdef CONFIG_LOCKDEP
148 int lockdep_ovsl_is_held(void);
150 #define lockdep_ovsl_is_held() 1
153 #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held())
154 #define ovsl_dereference(p) \
155 rcu_dereference_protected(p, lockdep_ovsl_is_held())
156 #define rcu_dereference_ovsl(p) \
157 rcu_dereference_check(p, lockdep_ovsl_is_held())
159 static inline struct net *ovs_dp_get_net(const struct datapath *dp)
161 return read_pnet(&dp->net);
164 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
166 write_pnet(&dp->net, net);
169 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
171 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
173 WARN_ON_ONCE(!rcu_read_lock_held());
174 return ovs_lookup_vport(dp, port_no);
177 static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
179 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
180 return ovs_lookup_vport(dp, port_no);
183 static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
186 return ovs_lookup_vport(dp, port_no);
189 extern struct notifier_block ovs_dp_device_notifier;
190 extern struct genl_family dp_vport_genl_family;
192 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);
193 void ovs_dp_detach_port(struct vport *);
194 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
195 const struct sw_flow_key *, const struct dp_upcall_info *);
197 const char *ovs_dp_name(const struct datapath *dp);
198 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
201 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
202 const struct sw_flow_actions *, struct sw_flow_key *);
204 void ovs_dp_notify_wq(struct work_struct *work);
206 int action_fifos_init(void);
207 void action_fifos_exit(void);
209 /* 'KEY' must not have any bits set outside of the 'MASK' */
210 #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK)))
211 #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK))
213 #define OVS_NLERR(logging_allowed, fmt, ...) \
215 if (logging_allowed && net_ratelimit()) \
216 pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \
218 #endif /* datapath.h */