linux/net/openvswitch/datapath.h
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   1/*
   2 * Copyright (c) 2007-2012 Nicira, Inc.
   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>
  28
  29#include "flow.h"
  30
  31struct 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 */
  48struct 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 */
  70struct 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 */
  89struct 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 */
 104struct dp_upcall_info {
 105        u8 cmd;
 106        const struct sw_flow_key *key;
 107        const struct nlattr *userdata;
 108        u32 pid;
 109};
 110
 111extern struct notifier_block ovs_dp_device_notifier;
 112extern struct genl_multicast_group ovs_dp_vport_multicast_group;
 113
 114void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
 115void ovs_dp_detach_port(struct vport *);
 116int ovs_dp_upcall(struct datapath *, struct sk_buff *,
 117                  const struct dp_upcall_info *);
 118
 119const char *ovs_dp_name(const struct datapath *dp);
 120struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
 121                                         u8 cmd);
 122
 123int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
 124#endif /* datapath.h */
 125
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