]>
Commit | Line | Data |
---|---|---|
a14bc59f | 1 | /* |
e0edde6f | 2 | * Copyright (c) 2007-2012 Nicira, Inc. |
a14bc59f | 3 | * |
a9a29d22 JG |
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 | |
a14bc59f BP |
17 | */ |
18 | ||
064af421 BP |
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> | |
064af421 | 25 | #include <linux/netdevice.h> |
064af421 | 26 | #include <linux/skbuff.h> |
821cb9fa | 27 | #include <linux/u64_stats_sync.h> |
dd8d6b8c JG |
28 | |
29 | #include "checksum.h" | |
9cb8d24d | 30 | #include "compat.h" |
2a4999f3 | 31 | #include "flow.h" |
6e0ce48e | 32 | #include "vlan.h" |
2a4999f3 | 33 | #include "vport.h" |
f2459fe7 | 34 | |
95b1d73a PS |
35 | #define DP_MAX_PORTS USHRT_MAX |
36 | #define DP_VPORT_HASH_BUCKETS 1024 | |
37 | ||
6ff686f2 PS |
38 | #define SAMPLE_ACTION_DEPTH 3 |
39 | ||
67a78abe BP |
40 | /** |
41 | * struct dp_stats_percpu - per-cpu packet processing statistics for a given | |
42 | * datapath. | |
67a78abe BP |
43 | * @n_hit: Number of received packets for which a matching flow was found in |
44 | * the flow table. | |
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). | |
67a78abe | 51 | */ |
064af421 | 52 | struct dp_stats_percpu { |
064af421 BP |
53 | u64 n_hit; |
54 | u64 n_missed; | |
55 | u64 n_lost; | |
821cb9fa | 56 | struct u64_stats_sync sync; |
064af421 BP |
57 | }; |
58 | ||
72b06300 BP |
59 | /** |
60 | * struct datapath - datapath for flow-based packet switching | |
46c6a11d | 61 | * @rcu: RCU callback head for deferred destruction. |
254f2dc8 | 62 | * @list_node: Element in global 'dps' list. |
cd2a59e9 | 63 | * @table: Current flow table. Protected by ovs_mutex and RCU. |
95b1d73a | 64 | * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by |
cd2a59e9 | 65 | * ovs_mutex and RCU. |
72b06300 | 66 | * @stats_percpu: Per-CPU datapath statistics. |
2a4999f3 | 67 | * @net: Reference to net namespace. |
ed099e92 BP |
68 | * |
69 | * Context: See the comment on locking at the top of datapath.c for additional | |
70 | * locking information. | |
72b06300 | 71 | */ |
064af421 | 72 | struct datapath { |
46c6a11d | 73 | struct rcu_head rcu; |
254f2dc8 | 74 | struct list_head list_node; |
064af421 | 75 | |
064af421 | 76 | /* Flow table. */ |
3544358a | 77 | struct flow_table __rcu *table; |
064af421 | 78 | |
064af421 | 79 | /* Switch ports. */ |
95b1d73a | 80 | struct hlist_head *ports; |
064af421 BP |
81 | |
82 | /* Stats. */ | |
d3097eff | 83 | struct dp_stats_percpu __percpu *stats_percpu; |
2a4999f3 PS |
84 | |
85 | #ifdef CONFIG_NET_NS | |
86 | /* Network namespace ref. */ | |
87 | struct net *net; | |
88 | #endif | |
064af421 BP |
89 | }; |
90 | ||
a063b0df JG |
91 | /** |
92 | * struct ovs_skb_cb - OVS data in skb CB | |
3976f6d5 | 93 | * @flow: The flow associated with this packet. May be %NULL if no flow. |
d1d71a36 | 94 | * @pkt_key: The flow information extracted from the packet. Must be nonnull. |
356af50b KM |
95 | * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the |
96 | * packet is not being tunneled. | |
a063b0df JG |
97 | * @ip_summed: Consistently stores L4 checksumming status across different |
98 | * kernel versions. | |
c3729ee4 JG |
99 | * @csum_start: Stores the offset from which to start checksumming independent |
100 | * of the transport header on all kernel versions. | |
b9298d3f | 101 | * packet was not received on a tunnel. |
6e0ce48e JG |
102 | * @vlan_tci: Provides a substitute for the skb->vlan_tci field on kernels |
103 | * before 2.6.27. | |
a063b0df JG |
104 | */ |
105 | struct ovs_skb_cb { | |
3976f6d5 | 106 | struct sw_flow *flow; |
d1d71a36 | 107 | struct sw_flow_key *pkt_key; |
356af50b | 108 | struct ovs_key_ipv4_tunnel *tun_key; |
dd8d6b8c | 109 | #ifdef NEED_CSUM_NORMALIZE |
659586ef | 110 | enum csum_type ip_summed; |
c3729ee4 | 111 | u16 csum_start; |
dd8d6b8c | 112 | #endif |
6e0ce48e JG |
113 | #ifdef NEED_VLAN_FIELD |
114 | u16 vlan_tci; | |
115 | #endif | |
a063b0df JG |
116 | }; |
117 | #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) | |
118 | ||
856081f6 BP |
119 | /** |
120 | * struct dp_upcall - metadata to include with a packet to send to userspace | |
df2c07f4 JP |
121 | * @cmd: One of %OVS_PACKET_CMD_*. |
122 | * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull. | |
e995e3df | 123 | * @userdata: If nonnull, its variable-length value is passed to userspace as |
98403001 | 124 | * %OVS_PACKET_ATTR_USERDATA. |
28aea917 | 125 | * @portid: Netlink PID to which packet should be sent. If @portid is 0 then no |
98403001 BP |
126 | * packet is sent and the packet is accounted in the datapath's @n_lost |
127 | * counter. | |
6ff686f2 | 128 | */ |
856081f6 | 129 | struct dp_upcall_info { |
982b8810 | 130 | u8 cmd; |
856081f6 | 131 | const struct sw_flow_key *key; |
98403001 | 132 | const struct nlattr *userdata; |
28aea917 | 133 | u32 portid; |
856081f6 BP |
134 | }; |
135 | ||
2a4999f3 PS |
136 | /** |
137 | * struct ovs_net - Per net-namespace data for ovs. | |
138 | * @dps: List of datapaths to enable dumping them all out. | |
139 | * Protected by genl_mutex. | |
140 | * @vport_net: Per network namespace data for vport. | |
141 | */ | |
142 | struct ovs_net { | |
143 | struct list_head dps; | |
85c9de19 | 144 | struct vport_net vport_net; |
cd2a59e9 | 145 | struct work_struct dp_notify_work; |
2a4999f3 PS |
146 | }; |
147 | ||
148 | extern int ovs_net_id; | |
cd2a59e9 PS |
149 | void ovs_lock(void); |
150 | void ovs_unlock(void); | |
151 | ||
152 | #ifdef CONFIG_LOCKDEP | |
153 | int lockdep_ovsl_is_held(void); | |
154 | #else | |
155 | #define lockdep_ovsl_is_held() 1 | |
156 | #endif | |
157 | ||
158 | #define ASSERT_OVSL() WARN_ON(unlikely(!lockdep_ovsl_is_held())) | |
159 | #define ovsl_dereference(p) \ | |
160 | rcu_dereference_protected(p, lockdep_ovsl_is_held()) | |
2a4999f3 PS |
161 | |
162 | static inline struct net *ovs_dp_get_net(struct datapath *dp) | |
163 | { | |
164 | return read_pnet(&dp->net); | |
165 | } | |
166 | ||
167 | static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) | |
168 | { | |
169 | write_pnet(&dp->net, net); | |
170 | } | |
171 | ||
95b1d73a PS |
172 | struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); |
173 | ||
174 | static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) | |
175 | { | |
176 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
177 | return ovs_lookup_vport(dp, port_no); | |
178 | } | |
179 | ||
cd2a59e9 | 180 | static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) |
95b1d73a | 181 | { |
cd2a59e9 | 182 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); |
95b1d73a PS |
183 | return ovs_lookup_vport(dp, port_no); |
184 | } | |
185 | ||
cd2a59e9 | 186 | static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) |
95b1d73a | 187 | { |
cd2a59e9 | 188 | ASSERT_OVSL(); |
95b1d73a PS |
189 | return ovs_lookup_vport(dp, port_no); |
190 | } | |
191 | ||
850b6b3b JG |
192 | extern struct notifier_block ovs_dp_device_notifier; |
193 | extern struct genl_multicast_group ovs_dp_vport_multicast_group; | |
064af421 | 194 | |
850b6b3b JG |
195 | void ovs_dp_process_received_packet(struct vport *, struct sk_buff *); |
196 | void ovs_dp_detach_port(struct vport *); | |
197 | int ovs_dp_upcall(struct datapath *, struct sk_buff *, | |
198 | const struct dp_upcall_info *); | |
064af421 | 199 | |
850b6b3b | 200 | const char *ovs_dp_name(const struct datapath *dp); |
28aea917 | 201 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 portid, u32 seq, |
f14d8083 | 202 | u8 cmd); |
064af421 | 203 | |
850b6b3b | 204 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb); |
cd2a59e9 | 205 | void ovs_dp_notify_wq(struct work_struct *work); |
1b936472 AZ |
206 | |
207 | #define OVS_NLERR(fmt, ...) \ | |
db0fe396 | 208 | pr_info_once("netlink: " fmt, ##__VA_ARGS__) |
1b936472 | 209 | |
064af421 | 210 | #endif /* datapath.h */ |