2 * Copyright (c) 2007-2015 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/net_namespace.h>
29 #include <net/ip_tunnels.h>
33 #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 * @input_vport: The original vport packet came in on. This value is cached
98 * when a packet is received by OVS.
99 * @mru: The maximum received fragement size; 0 if the packet is not
103 struct vport
*input_vport
;
106 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
109 * struct dp_upcall - metadata to include with a packet to send to userspace
110 * @cmd: One of %OVS_PACKET_CMD_*.
111 * @userdata: If nonnull, its variable-length value is passed to userspace as
112 * %OVS_PACKET_ATTR_USERDATA.
113 * @portid: Netlink portid to which packet should be sent. If @portid is 0
114 * then no packet is sent and the packet is accounted in the datapath's @n_lost
116 * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY.
117 * @mru: If not zero, Maximum received IP fragment size.
119 struct dp_upcall_info
{
120 struct ip_tunnel_info
*egress_tun_info
;
121 const void *egress_tun_opts
;
122 const struct nlattr
*userdata
;
123 const struct nlattr
*actions
;
131 * struct ovs_net - Per net-namespace data for ovs.
132 * @dps: List of datapaths to enable dumping them all out.
133 * Protected by genl_mutex.
136 struct list_head dps
;
137 struct work_struct dp_notify_work
;
139 /* Module reference for configuring conntrack. */
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 rpl_read_pnet(&dp
->net
);
164 static inline void ovs_dp_set_net(struct datapath
*dp
, struct net
*net
)
166 rpl_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
;
191 extern struct genl_multicast_group ovs_dp_vport_multicast_group
;
193 void ovs_dp_process_packet(struct sk_buff
*skb
, struct sw_flow_key
*key
);
194 void ovs_dp_detach_port(struct vport
*);
195 int ovs_dp_upcall(struct datapath
*, struct sk_buff
*,
196 const struct sw_flow_key
*, const struct dp_upcall_info
*);
198 const char *ovs_dp_name(const struct datapath
*dp
);
199 struct sk_buff
*ovs_vport_cmd_build_info(struct vport
*, u32 pid
, u32 seq
,
202 int ovs_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
203 const struct sw_flow_actions
*, struct sw_flow_key
*);
205 void ovs_dp_notify_wq(struct work_struct
*work
);
207 int action_fifos_init(void);
208 void action_fifos_exit(void);
210 /* 'KEY' must not have any bits set outside of the 'MASK' */
211 #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK)))
212 #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK))
214 #define OVS_NLERR(logging_allowed, fmt, ...) \
216 if (logging_allowed && net_ratelimit()) \
217 pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \
219 #endif /* datapath.h */