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