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 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 */ 125