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a14bc59f | 1 | /* |
a9a29d22 | 2 | * Copyright (c) 2007-2011 Nicira Networks. |
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" |
064af421 | 31 | #include "flow.h" |
2ba9026e | 32 | #include "dp_sysfs.h" |
6e0ce48e | 33 | #include "vlan.h" |
064af421 | 34 | |
f2459fe7 | 35 | struct vport; |
f2459fe7 | 36 | |
5eab9abc | 37 | #define DP_MAX_PORTS 1024 |
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. |
ed099e92 | 63 | * @ifobj: Represents /sys/class/net/<devname>/brif. Protected by RTNL. |
72b06300 | 64 | * @n_flows: Number of flows currently in flow table. |
ed099e92 | 65 | * @table: Current flow table. Protected by genl_lock and RCU. |
df2c07f4 | 66 | * @ports: Map from port number to &struct vport. %OVSP_LOCAL port |
ed099e92 BP |
67 | * always exists, other ports may be %NULL. Protected by RTNL and RCU. |
68 | * @port_list: List of all ports in @ports in arbitrary order. RTNL required | |
69 | * to iterate or modify. | |
72b06300 | 70 | * @stats_percpu: Per-CPU datapath statistics. |
ed099e92 BP |
71 | * |
72 | * Context: See the comment on locking at the top of datapath.c for additional | |
73 | * locking information. | |
72b06300 | 74 | */ |
064af421 | 75 | struct datapath { |
46c6a11d | 76 | struct rcu_head rcu; |
254f2dc8 | 77 | struct list_head list_node; |
064af421 | 78 | struct kobject ifobj; |
064af421 | 79 | |
064af421 | 80 | /* Flow table. */ |
3544358a | 81 | struct flow_table __rcu *table; |
064af421 | 82 | |
064af421 | 83 | /* Switch ports. */ |
e1040c77 | 84 | struct vport __rcu *ports[DP_MAX_PORTS]; |
72b06300 | 85 | struct list_head port_list; |
064af421 BP |
86 | |
87 | /* Stats. */ | |
d3097eff | 88 | struct dp_stats_percpu __percpu *stats_percpu; |
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. |
c3729ee4 | 94 | * @tun_id: ID of the tunnel that encapsulated this packet. It is 0 if the |
a063b0df JG |
95 | * @ip_summed: Consistently stores L4 checksumming status across different |
96 | * kernel versions. | |
c3729ee4 JG |
97 | * @csum_start: Stores the offset from which to start checksumming independent |
98 | * of the transport header on all kernel versions. | |
b9298d3f | 99 | * packet was not received on a tunnel. |
6e0ce48e JG |
100 | * @vlan_tci: Provides a substitute for the skb->vlan_tci field on kernels |
101 | * before 2.6.27. | |
a063b0df JG |
102 | */ |
103 | struct ovs_skb_cb { | |
3976f6d5 | 104 | struct sw_flow *flow; |
c3729ee4 | 105 | __be64 tun_id; |
dd8d6b8c | 106 | #ifdef NEED_CSUM_NORMALIZE |
659586ef | 107 | enum csum_type ip_summed; |
c3729ee4 | 108 | u16 csum_start; |
dd8d6b8c | 109 | #endif |
6e0ce48e JG |
110 | #ifdef NEED_VLAN_FIELD |
111 | u16 vlan_tci; | |
112 | #endif | |
a063b0df JG |
113 | }; |
114 | #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) | |
115 | ||
856081f6 BP |
116 | /** |
117 | * struct dp_upcall - metadata to include with a packet to send to userspace | |
df2c07f4 JP |
118 | * @cmd: One of %OVS_PACKET_CMD_*. |
119 | * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull. | |
98403001 BP |
120 | * @userdata: If nonnull, its u64 value is extracted and passed to userspace as |
121 | * %OVS_PACKET_ATTR_USERDATA. | |
122 | * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no | |
123 | * packet is sent and the packet is accounted in the datapath's @n_lost | |
124 | * counter. | |
6ff686f2 | 125 | */ |
856081f6 | 126 | struct dp_upcall_info { |
982b8810 | 127 | u8 cmd; |
856081f6 | 128 | const struct sw_flow_key *key; |
98403001 BP |
129 | const struct nlattr *userdata; |
130 | u32 pid; | |
856081f6 BP |
131 | }; |
132 | ||
850b6b3b JG |
133 | extern struct notifier_block ovs_dp_device_notifier; |
134 | extern struct genl_multicast_group ovs_dp_vport_multicast_group; | |
135 | extern int (*ovs_dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd); | |
064af421 | 136 | |
850b6b3b JG |
137 | void ovs_dp_process_received_packet(struct vport *, struct sk_buff *); |
138 | void ovs_dp_detach_port(struct vport *); | |
139 | int ovs_dp_upcall(struct datapath *, struct sk_buff *, | |
140 | const struct dp_upcall_info *); | |
064af421 | 141 | |
850b6b3b | 142 | const char *ovs_dp_name(const struct datapath *dp); |
f14d8083 EJ |
143 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq, |
144 | u8 cmd); | |
064af421 | 145 | |
850b6b3b | 146 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb); |
064af421 | 147 | #endif /* datapath.h */ |