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> 28 #include <linux/version.h> 29 30 #include "flow.h" 31 32 struct vport; 33 34 #define DP_MAX_PORTS 1024 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. 60 * @n_flows: Number of flows currently in flow table. 61 * @table: Current flow table. Protected by genl_lock and RCU. 62 * @ports: Map from port number to &struct vport. %OVSP_LOCAL port 63 * always exists, other ports may be %NULL. Protected by RTNL and RCU. 64 * @port_list: List of all ports in @ports in arbitrary order. RTNL required 65 * to iterate or modify. 66 * @stats_percpu: Per-CPU datapath statistics. 67 * 68 * Context: See the comment on locking at the top of datapath.c for additional 69 * locking information. 70 */ 71 struct datapath { 72 struct rcu_head rcu; 73 struct list_head list_node; 74 75 /* Flow table. */ 76 struct flow_table __rcu *table; 77 78 /* Switch ports. */ 79 struct vport __rcu *ports[DP_MAX_PORTS]; 80 struct list_head port_list; 81 82 /* Stats. */ 83 struct dp_stats_percpu __percpu *stats_percpu; 84 }; 85 86 /** 87 * struct ovs_skb_cb - OVS data in skb CB 88 * @flow: The flow associated with this packet. May be %NULL if no flow. 89 */ 90 struct ovs_skb_cb { 91 struct sw_flow *flow; 92 }; 93 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) 94 95 /** 96 * struct dp_upcall - metadata to include with a packet to send to userspace 97 * @cmd: One of %OVS_PACKET_CMD_*. 98 * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull. 99 * @userdata: If nonnull, its u64 value is extracted and passed to userspace as 100 * %OVS_PACKET_ATTR_USERDATA. 101 * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no 102 * packet is sent and the packet is accounted in the datapath's @n_lost 103 * counter. 104 */ 105 struct dp_upcall_info { 106 u8 cmd; 107 const struct sw_flow_key *key; 108 const struct nlattr *userdata; 109 u32 pid; 110 }; 111 112 extern struct notifier_block ovs_dp_device_notifier; 113 extern struct genl_multicast_group ovs_dp_vport_multicast_group; 114 115 void ovs_dp_process_received_packet(struct vport *, struct sk_buff *); 116 void ovs_dp_detach_port(struct vport *); 117 int ovs_dp_upcall(struct datapath *, struct sk_buff *, 118 const struct dp_upcall_info *); 119 120 const char *ovs_dp_name(const struct datapath *dp); 121 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq, 122 u8 cmd); 123 124 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb); 125 #endif /* datapath.h */ 126