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ccb1352e | 1 | /* |
caf2ee14 | 2 | * Copyright (c) 2007-2012 Nicira, Inc. |
ccb1352e JG |
3 | * |
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. | |
7 | * | |
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. | |
12 | * | |
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 | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #ifndef DATAPATH_H | |
20 | #define DATAPATH_H 1 | |
21 | ||
22 | #include <asm/page.h> | |
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> | |
ccb1352e JG |
28 | |
29 | #include "flow.h" | |
e6445719 | 30 | #include "flow_table.h" |
46df7b81 | 31 | #include "vport.h" |
ccb1352e | 32 | |
15eac2a7 PS |
33 | #define DP_MAX_PORTS USHRT_MAX |
34 | #define DP_VPORT_HASH_BUCKETS 1024 | |
35 | ||
ccb1352e JG |
36 | #define SAMPLE_ACTION_DEPTH 3 |
37 | ||
38 | /** | |
39 | * struct dp_stats_percpu - per-cpu packet processing statistics for a given | |
40 | * datapath. | |
41 | * @n_hit: Number of received packets for which a matching flow was found in | |
42 | * the flow table. | |
43 | * @n_miss: Number of received packets that had no matching flow in the flow | |
44 | * table. The sum of @n_hit and @n_miss is the number of packets that have | |
45 | * been received by the datapath. | |
46 | * @n_lost: Number of received packets that had no matching flow in the flow | |
47 | * table that could not be sent to userspace (normally due to an overflow in | |
48 | * one of the datapath's queues). | |
49 | */ | |
50 | struct dp_stats_percpu { | |
51 | u64 n_hit; | |
52 | u64 n_missed; | |
53 | u64 n_lost; | |
54 | struct u64_stats_sync sync; | |
55 | }; | |
56 | ||
57 | /** | |
58 | * struct datapath - datapath for flow-based packet switching | |
59 | * @rcu: RCU callback head for deferred destruction. | |
60 | * @list_node: Element in global 'dps' list. | |
8e4e1713 | 61 | * @table: Current flow table. Protected by ovs_mutex and RCU. |
15eac2a7 | 62 | * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by |
8e4e1713 | 63 | * ovs_mutex and RCU. |
ccb1352e | 64 | * @stats_percpu: Per-CPU datapath statistics. |
46df7b81 | 65 | * @net: Reference to net namespace. |
e7f13329 | 66 | * @last_rehash: Timestamp of last rehash. |
ccb1352e JG |
67 | * |
68 | * Context: See the comment on locking at the top of datapath.c for additional | |
69 | * locking information. | |
70 | */ | |
71 | struct datapath { | |
72 | struct rcu_head rcu; | |
73 | struct list_head list_node; | |
74 | ||
75 | /* Flow table. */ | |
76 | struct flow_table __rcu *table; | |
77 | ||
78 | /* Switch ports. */ | |
15eac2a7 | 79 | struct hlist_head *ports; |
ccb1352e JG |
80 | |
81 | /* Stats. */ | |
82 | struct dp_stats_percpu __percpu *stats_percpu; | |
46df7b81 PS |
83 | |
84 | #ifdef CONFIG_NET_NS | |
85 | /* Network namespace ref. */ | |
86 | struct net *net; | |
87 | #endif | |
e7f13329 | 88 | unsigned long last_rehash; |
ccb1352e JG |
89 | }; |
90 | ||
91 | /** | |
92 | * struct ovs_skb_cb - OVS data in skb CB | |
93 | * @flow: The flow associated with this packet. May be %NULL if no flow. | |
03f0d916 | 94 | * @pkt_key: The flow information extracted from the packet. Must be nonnull. |
7d5437c7 PS |
95 | * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the |
96 | * packet is not being tunneled. | |
ccb1352e JG |
97 | */ |
98 | struct ovs_skb_cb { | |
99 | struct sw_flow *flow; | |
03f0d916 | 100 | struct sw_flow_key *pkt_key; |
7d5437c7 | 101 | struct ovs_key_ipv4_tunnel *tun_key; |
ccb1352e JG |
102 | }; |
103 | #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) | |
104 | ||
105 | /** | |
106 | * struct dp_upcall - metadata to include with a packet to send to userspace | |
107 | * @cmd: One of %OVS_PACKET_CMD_*. | |
108 | * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull. | |
4490108b | 109 | * @userdata: If nonnull, its variable-length value is passed to userspace as |
ccb1352e JG |
110 | * %OVS_PACKET_ATTR_USERDATA. |
111 | * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no | |
112 | * packet is sent and the packet is accounted in the datapath's @n_lost | |
113 | * counter. | |
114 | */ | |
115 | struct dp_upcall_info { | |
116 | u8 cmd; | |
117 | const struct sw_flow_key *key; | |
118 | const struct nlattr *userdata; | |
15e47304 | 119 | u32 portid; |
ccb1352e JG |
120 | }; |
121 | ||
8e4e1713 PS |
122 | /** |
123 | * struct ovs_net - Per net-namespace data for ovs. | |
124 | * @dps: List of datapaths to enable dumping them all out. | |
125 | * Protected by genl_mutex. | |
126 | */ | |
127 | struct ovs_net { | |
128 | struct list_head dps; | |
129 | struct work_struct dp_notify_work; | |
aa310701 | 130 | struct vport_net vport_net; |
8e4e1713 PS |
131 | }; |
132 | ||
133 | extern int ovs_net_id; | |
134 | void ovs_lock(void); | |
135 | void ovs_unlock(void); | |
136 | ||
137 | #ifdef CONFIG_LOCKDEP | |
138 | int lockdep_ovsl_is_held(void); | |
139 | #else | |
140 | #define lockdep_ovsl_is_held() 1 | |
141 | #endif | |
142 | ||
143 | #define ASSERT_OVSL() WARN_ON(unlikely(!lockdep_ovsl_is_held())) | |
144 | #define ovsl_dereference(p) \ | |
145 | rcu_dereference_protected(p, lockdep_ovsl_is_held()) | |
146 | ||
46df7b81 PS |
147 | static inline struct net *ovs_dp_get_net(struct datapath *dp) |
148 | { | |
149 | return read_pnet(&dp->net); | |
150 | } | |
151 | ||
152 | static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) | |
153 | { | |
154 | write_pnet(&dp->net, net); | |
155 | } | |
156 | ||
8e4e1713 PS |
157 | struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); |
158 | ||
159 | static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) | |
160 | { | |
161 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
162 | return ovs_lookup_vport(dp, port_no); | |
163 | } | |
164 | ||
165 | static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) | |
166 | { | |
167 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); | |
168 | return ovs_lookup_vport(dp, port_no); | |
169 | } | |
170 | ||
171 | static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) | |
172 | { | |
173 | ASSERT_OVSL(); | |
174 | return ovs_lookup_vport(dp, port_no); | |
175 | } | |
176 | ||
ccb1352e JG |
177 | extern struct notifier_block ovs_dp_device_notifier; |
178 | extern struct genl_multicast_group ovs_dp_vport_multicast_group; | |
179 | ||
180 | void ovs_dp_process_received_packet(struct vport *, struct sk_buff *); | |
181 | void ovs_dp_detach_port(struct vport *); | |
182 | int ovs_dp_upcall(struct datapath *, struct sk_buff *, | |
183 | const struct dp_upcall_info *); | |
184 | ||
185 | const char *ovs_dp_name(const struct datapath *dp); | |
186 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq, | |
187 | u8 cmd); | |
188 | ||
189 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb); | |
8e4e1713 | 190 | void ovs_dp_notify_wq(struct work_struct *work); |
03f0d916 AZ |
191 | |
192 | #define OVS_NLERR(fmt, ...) \ | |
193 | pr_info_once("netlink: " fmt, ##__VA_ARGS__) | |
194 | ||
ccb1352e | 195 | #endif /* datapath.h */ |