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a14bc59f | 1 | /* |
856081f6 | 2 | * Copyright (c) 2009, 2010, 2011 Nicira Networks. |
a14bc59f BP |
3 | * Distributed under the terms of the GNU GPL version 2. |
4 | * | |
5 | * Significant portions of this file may be copied from parts of the Linux | |
6 | * kernel, by Linus Torvalds and others. | |
7 | */ | |
8 | ||
064af421 BP |
9 | /* Interface exported by openvswitch_mod. */ |
10 | ||
11 | #ifndef DATAPATH_H | |
12 | #define DATAPATH_H 1 | |
13 | ||
14 | #include <asm/page.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/mutex.h> | |
064af421 | 17 | #include <linux/netdevice.h> |
38c6ecbc | 18 | #include <linux/seqlock.h> |
064af421 | 19 | #include <linux/skbuff.h> |
806e39cf | 20 | #include <linux/version.h> |
dd8d6b8c JG |
21 | |
22 | #include "checksum.h" | |
064af421 | 23 | #include "flow.h" |
2ba9026e | 24 | #include "dp_sysfs.h" |
6e0ce48e | 25 | #include "vlan.h" |
064af421 | 26 | |
f2459fe7 | 27 | struct vport; |
f2459fe7 | 28 | |
064af421 BP |
29 | /* Mask for the priority bits in a vlan header. If we ever merge upstream |
30 | * then this should go into include/linux/if_vlan.h. */ | |
31 | #define VLAN_PCP_MASK 0xe000 | |
a4fbb689 | 32 | #define VLAN_PCP_SHIFT 13 |
064af421 | 33 | |
5eab9abc | 34 | #define DP_MAX_PORTS 1024 |
064af421 | 35 | |
67a78abe BP |
36 | /** |
37 | * struct dp_stats_percpu - per-cpu packet processing statistics for a given | |
38 | * datapath. | |
39 | * @n_frags: Number of IP fragments processed by 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). | |
67a78abe | 48 | */ |
064af421 BP |
49 | struct dp_stats_percpu { |
50 | u64 n_frags; | |
51 | u64 n_hit; | |
52 | u64 n_missed; | |
53 | u64 n_lost; | |
38c6ecbc | 54 | seqcount_t seqlock; |
064af421 BP |
55 | }; |
56 | ||
72b06300 BP |
57 | /** |
58 | * struct datapath - datapath for flow-based packet switching | |
46c6a11d | 59 | * @rcu: RCU callback head for deferred destruction. |
254f2dc8 BP |
60 | * @dp_ifindex: ifindex of local port. |
61 | * @list_node: Element in global 'dps' list. | |
ed099e92 | 62 | * @ifobj: Represents /sys/class/net/<devname>/brif. Protected by RTNL. |
72b06300 | 63 | * @drop_frags: Drop all IP fragments if nonzero. |
72b06300 | 64 | * @n_flows: Number of flows currently in flow table. |
ed099e92 | 65 | * @table: Current flow table. Protected by genl_lock and RCU. |
e779d8d9 | 66 | * @ports: Map from port number to &struct vport. %ODPP_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. |
b4a7a3f3 | 71 | * @sflow_probability: Number of packets out of UINT_MAX to sample to the |
982b8810 BP |
72 | * %ODP_PACKET_CMD_SAMPLE multicast group, e.g. (@sflow_probability/UINT_MAX) |
73 | * is the probability of sampling a given packet. | |
ed099e92 BP |
74 | * |
75 | * Context: See the comment on locking at the top of datapath.c for additional | |
76 | * locking information. | |
72b06300 | 77 | */ |
064af421 | 78 | struct datapath { |
46c6a11d | 79 | struct rcu_head rcu; |
254f2dc8 BP |
80 | int dp_ifindex; |
81 | struct list_head list_node; | |
064af421 | 82 | struct kobject ifobj; |
064af421 BP |
83 | |
84 | int drop_frags; | |
85 | ||
064af421 | 86 | /* Flow table. */ |
e1040c77 | 87 | struct tbl __rcu *table; |
064af421 | 88 | |
064af421 | 89 | /* Switch ports. */ |
e1040c77 | 90 | struct vport __rcu *ports[DP_MAX_PORTS]; |
72b06300 | 91 | struct list_head port_list; |
064af421 BP |
92 | |
93 | /* Stats. */ | |
d3097eff | 94 | struct dp_stats_percpu __percpu *stats_percpu; |
72b06300 BP |
95 | |
96 | /* sFlow Sampling */ | |
97 | unsigned int sflow_probability; | |
064af421 BP |
98 | }; |
99 | ||
a063b0df JG |
100 | /** |
101 | * struct ovs_skb_cb - OVS data in skb CB | |
e779d8d9 | 102 | * @vport: The datapath port on which the skb entered the switch. |
3976f6d5 | 103 | * @flow: The flow associated with this packet. May be %NULL if no flow. |
a063b0df JG |
104 | * @ip_summed: Consistently stores L4 checksumming status across different |
105 | * kernel versions. | |
b9298d3f BP |
106 | * @tun_id: ID of the tunnel that encapsulated this packet. It is 0 if the |
107 | * packet was not received on a tunnel. | |
6e0ce48e JG |
108 | * @vlan_tci: Provides a substitute for the skb->vlan_tci field on kernels |
109 | * before 2.6.27. | |
a063b0df JG |
110 | */ |
111 | struct ovs_skb_cb { | |
e779d8d9 | 112 | struct vport *vport; |
3976f6d5 | 113 | struct sw_flow *flow; |
dd8d6b8c | 114 | #ifdef NEED_CSUM_NORMALIZE |
659586ef | 115 | enum csum_type ip_summed; |
dd8d6b8c | 116 | #endif |
b9298d3f | 117 | __be64 tun_id; |
6e0ce48e JG |
118 | #ifdef NEED_VLAN_FIELD |
119 | u16 vlan_tci; | |
120 | #endif | |
a063b0df JG |
121 | }; |
122 | #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) | |
123 | ||
856081f6 BP |
124 | /** |
125 | * struct dp_upcall - metadata to include with a packet to send to userspace | |
982b8810 | 126 | * @cmd: One of %ODP_PACKET_CMD_*. |
856081f6 BP |
127 | * @key: Becomes %ODP_PACKET_ATTR_KEY. Must be nonnull. |
128 | * @userdata: Becomes %ODP_PACKET_ATTR_USERDATA if nonzero. | |
129 | * @sample_pool: Becomes %ODP_PACKET_ATTR_SAMPLE_POOL if nonzero. | |
130 | * @actions: Becomes %ODP_PACKET_ATTR_ACTIONS if nonnull. | |
131 | * @actions_len: Number of bytes in @actions. | |
132 | */ | |
133 | struct dp_upcall_info { | |
982b8810 | 134 | u8 cmd; |
856081f6 BP |
135 | const struct sw_flow_key *key; |
136 | u64 userdata; | |
137 | u32 sample_pool; | |
138 | const struct nlattr *actions; | |
139 | u32 actions_len; | |
140 | }; | |
141 | ||
064af421 BP |
142 | extern struct notifier_block dp_device_notifier; |
143 | extern int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd); | |
064af421 | 144 | |
e779d8d9 BP |
145 | void dp_process_received_packet(struct vport *, struct sk_buff *); |
146 | int dp_detach_port(struct vport *); | |
856081f6 | 147 | int dp_upcall(struct datapath *, struct sk_buff *, const struct dp_upcall_info *); |
1dcf111b | 148 | int dp_min_mtu(const struct datapath *dp); |
f2459fe7 | 149 | void set_internal_devs_mtu(const struct datapath *dp); |
064af421 BP |
150 | |
151 | struct datapath *get_dp(int dp_idx); | |
f2459fe7 | 152 | const char *dp_name(const struct datapath *dp); |
064af421 | 153 | |
064af421 | 154 | #endif /* datapath.h */ |