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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). | |
1bd7116f AZ |
49 | * @n_mask_hit: Number of masks looked up for flow match. |
50 | * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked | |
51 | * up per packet. | |
ccb1352e JG |
52 | */ |
53 | struct dp_stats_percpu { | |
54 | u64 n_hit; | |
55 | u64 n_missed; | |
56 | u64 n_lost; | |
1bd7116f | 57 | u64 n_mask_hit; |
df9d9fdf | 58 | struct u64_stats_sync syncp; |
ccb1352e JG |
59 | }; |
60 | ||
61 | /** | |
62 | * struct datapath - datapath for flow-based packet switching | |
63 | * @rcu: RCU callback head for deferred destruction. | |
64 | * @list_node: Element in global 'dps' list. | |
b637e498 | 65 | * @table: flow table. |
15eac2a7 | 66 | * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by |
8e4e1713 | 67 | * ovs_mutex and RCU. |
ccb1352e | 68 | * @stats_percpu: Per-CPU datapath statistics. |
46df7b81 | 69 | * @net: Reference to net namespace. |
ccb1352e JG |
70 | * |
71 | * Context: See the comment on locking at the top of datapath.c for additional | |
72 | * locking information. | |
73 | */ | |
74 | struct datapath { | |
75 | struct rcu_head rcu; | |
76 | struct list_head list_node; | |
77 | ||
78 | /* Flow table. */ | |
b637e498 | 79 | struct flow_table table; |
ccb1352e JG |
80 | |
81 | /* Switch ports. */ | |
15eac2a7 | 82 | struct hlist_head *ports; |
ccb1352e JG |
83 | |
84 | /* Stats. */ | |
85 | struct dp_stats_percpu __percpu *stats_percpu; | |
46df7b81 PS |
86 | |
87 | #ifdef CONFIG_NET_NS | |
88 | /* Network namespace ref. */ | |
89 | struct net *net; | |
90 | #endif | |
43d4be9c TG |
91 | |
92 | u32 user_features; | |
ccb1352e JG |
93 | }; |
94 | ||
95 | /** | |
96 | * struct ovs_skb_cb - OVS data in skb CB | |
97 | * @flow: The flow associated with this packet. May be %NULL if no flow. | |
03f0d916 | 98 | * @pkt_key: The flow information extracted from the packet. Must be nonnull. |
7d5437c7 PS |
99 | * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the |
100 | * packet is not being tunneled. | |
ccb1352e JG |
101 | */ |
102 | struct ovs_skb_cb { | |
103 | struct sw_flow *flow; | |
03f0d916 | 104 | struct sw_flow_key *pkt_key; |
7d5437c7 | 105 | struct ovs_key_ipv4_tunnel *tun_key; |
ccb1352e JG |
106 | }; |
107 | #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) | |
108 | ||
109 | /** | |
110 | * struct dp_upcall - metadata to include with a packet to send to userspace | |
111 | * @cmd: One of %OVS_PACKET_CMD_*. | |
112 | * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull. | |
4490108b | 113 | * @userdata: If nonnull, its variable-length value is passed to userspace as |
ccb1352e JG |
114 | * %OVS_PACKET_ATTR_USERDATA. |
115 | * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no | |
116 | * packet is sent and the packet is accounted in the datapath's @n_lost | |
117 | * counter. | |
118 | */ | |
119 | struct dp_upcall_info { | |
120 | u8 cmd; | |
121 | const struct sw_flow_key *key; | |
122 | const struct nlattr *userdata; | |
15e47304 | 123 | u32 portid; |
ccb1352e JG |
124 | }; |
125 | ||
8e4e1713 PS |
126 | /** |
127 | * struct ovs_net - Per net-namespace data for ovs. | |
128 | * @dps: List of datapaths to enable dumping them all out. | |
129 | * Protected by genl_mutex. | |
130 | */ | |
131 | struct ovs_net { | |
132 | struct list_head dps; | |
133 | struct work_struct dp_notify_work; | |
aa310701 | 134 | struct vport_net vport_net; |
8e4e1713 PS |
135 | }; |
136 | ||
137 | extern int ovs_net_id; | |
138 | void ovs_lock(void); | |
139 | void ovs_unlock(void); | |
140 | ||
141 | #ifdef CONFIG_LOCKDEP | |
142 | int lockdep_ovsl_is_held(void); | |
143 | #else | |
144 | #define lockdep_ovsl_is_held() 1 | |
145 | #endif | |
146 | ||
80019d31 | 147 | #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held()) |
8e4e1713 PS |
148 | #define ovsl_dereference(p) \ |
149 | rcu_dereference_protected(p, lockdep_ovsl_is_held()) | |
663efa36 JG |
150 | #define rcu_dereference_ovsl(p) \ |
151 | rcu_dereference_check(p, lockdep_ovsl_is_held()) | |
8e4e1713 | 152 | |
46df7b81 PS |
153 | static inline struct net *ovs_dp_get_net(struct datapath *dp) |
154 | { | |
155 | return read_pnet(&dp->net); | |
156 | } | |
157 | ||
158 | static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) | |
159 | { | |
160 | write_pnet(&dp->net, net); | |
161 | } | |
162 | ||
8e4e1713 PS |
163 | struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); |
164 | ||
165 | static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) | |
166 | { | |
167 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
168 | return ovs_lookup_vport(dp, port_no); | |
169 | } | |
170 | ||
171 | static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) | |
172 | { | |
173 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); | |
174 | return ovs_lookup_vport(dp, port_no); | |
175 | } | |
176 | ||
177 | static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) | |
178 | { | |
179 | ASSERT_OVSL(); | |
180 | return ovs_lookup_vport(dp, port_no); | |
181 | } | |
182 | ||
ccb1352e | 183 | extern struct notifier_block ovs_dp_device_notifier; |
68eb5503 | 184 | extern struct genl_family dp_vport_genl_family; |
ccb1352e JG |
185 | |
186 | void ovs_dp_process_received_packet(struct vport *, struct sk_buff *); | |
187 | void ovs_dp_detach_port(struct vport *); | |
188 | int ovs_dp_upcall(struct datapath *, struct sk_buff *, | |
189 | const struct dp_upcall_info *); | |
190 | ||
ccb1352e JG |
191 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq, |
192 | u8 cmd); | |
193 | ||
194 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb); | |
8e4e1713 | 195 | void ovs_dp_notify_wq(struct work_struct *work); |
03f0d916 | 196 | |
1815a883 JP |
197 | #define OVS_NLERR(fmt, ...) \ |
198 | do { \ | |
199 | if (net_ratelimit()) \ | |
200 | pr_info("netlink: " fmt, ##__VA_ARGS__); \ | |
201 | } while (0) | |
ccb1352e | 202 | #endif /* datapath.h */ |