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ccb1352e JG |
1 | /* |
2 | * Copyright (c) 2007-2011 Nicira Networks. | |
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" | |
30 | ||
31 | struct vport; | |
32 | ||
33 | #define DP_MAX_PORTS 1024 | |
34 | #define SAMPLE_ACTION_DEPTH 3 | |
35 | ||
36 | /** | |
37 | * struct dp_stats_percpu - per-cpu packet processing statistics for a given | |
38 | * datapath. | |
39 | * @n_hit: Number of received packets for which a matching flow was found in | |
40 | * the flow table. | |
41 | * @n_miss: Number of received packets that had no matching flow in the flow | |
42 | * table. The sum of @n_hit and @n_miss is the number of packets that have | |
43 | * been received by the datapath. | |
44 | * @n_lost: Number of received packets that had no matching flow in the flow | |
45 | * table that could not be sent to userspace (normally due to an overflow in | |
46 | * one of the datapath's queues). | |
47 | */ | |
48 | struct dp_stats_percpu { | |
49 | u64 n_hit; | |
50 | u64 n_missed; | |
51 | u64 n_lost; | |
52 | struct u64_stats_sync sync; | |
53 | }; | |
54 | ||
55 | /** | |
56 | * struct datapath - datapath for flow-based packet switching | |
57 | * @rcu: RCU callback head for deferred destruction. | |
58 | * @list_node: Element in global 'dps' list. | |
59 | * @n_flows: Number of flows currently in flow table. | |
60 | * @table: Current flow table. Protected by genl_lock and RCU. | |
61 | * @ports: Map from port number to &struct vport. %OVSP_LOCAL port | |
62 | * always exists, other ports may be %NULL. Protected by RTNL and RCU. | |
63 | * @port_list: List of all ports in @ports in arbitrary order. RTNL required | |
64 | * to iterate or modify. | |
65 | * @stats_percpu: Per-CPU datapath statistics. | |
66 | * | |
67 | * Context: See the comment on locking at the top of datapath.c for additional | |
68 | * locking information. | |
69 | */ | |
70 | struct datapath { | |
71 | struct rcu_head rcu; | |
72 | struct list_head list_node; | |
73 | ||
74 | /* Flow table. */ | |
75 | struct flow_table __rcu *table; | |
76 | ||
77 | /* Switch ports. */ | |
78 | struct vport __rcu *ports[DP_MAX_PORTS]; | |
79 | struct list_head port_list; | |
80 | ||
81 | /* Stats. */ | |
82 | struct dp_stats_percpu __percpu *stats_percpu; | |
83 | }; | |
84 | ||
85 | /** | |
86 | * struct ovs_skb_cb - OVS data in skb CB | |
87 | * @flow: The flow associated with this packet. May be %NULL if no flow. | |
88 | */ | |
89 | struct ovs_skb_cb { | |
90 | struct sw_flow *flow; | |
91 | }; | |
92 | #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) | |
93 | ||
94 | /** | |
95 | * struct dp_upcall - metadata to include with a packet to send to userspace | |
96 | * @cmd: One of %OVS_PACKET_CMD_*. | |
97 | * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull. | |
98 | * @userdata: If nonnull, its u64 value is extracted and passed to userspace as | |
99 | * %OVS_PACKET_ATTR_USERDATA. | |
100 | * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no | |
101 | * packet is sent and the packet is accounted in the datapath's @n_lost | |
102 | * counter. | |
103 | */ | |
104 | struct dp_upcall_info { | |
105 | u8 cmd; | |
106 | const struct sw_flow_key *key; | |
107 | const struct nlattr *userdata; | |
108 | u32 pid; | |
109 | }; | |
110 | ||
111 | extern struct notifier_block ovs_dp_device_notifier; | |
112 | extern struct genl_multicast_group ovs_dp_vport_multicast_group; | |
113 | ||
114 | void ovs_dp_process_received_packet(struct vport *, struct sk_buff *); | |
115 | void ovs_dp_detach_port(struct vport *); | |
116 | int ovs_dp_upcall(struct datapath *, struct sk_buff *, | |
117 | const struct dp_upcall_info *); | |
118 | ||
119 | const char *ovs_dp_name(const struct datapath *dp); | |
120 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq, | |
121 | u8 cmd); | |
122 | ||
123 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb); | |
124 | #endif /* datapath.h */ |