1/* 2 * Copyright (c) 2007-2014 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#include "flow_table.h" 31#include "vport.h" 32 33#define DP_MAX_PORTS USHRT_MAX 34#define DP_VPORT_HASH_BUCKETS 1024 35 36#define SAMPLE_ACTION_DEPTH 3 37 38/** 39 * struct dp_stats_percpu - per-cpu packet processing statistics for a given 40 * datapath. 41 * @n_hit: Number of received packets for which a matching flow was found in 42 * the flow table. 43 * @n_miss: Number of received packets that had no matching flow in the flow 44 * table. The sum of @n_hit and @n_miss is the number of packets that have 45 * been received by the datapath. 46 * @n_lost: Number of received packets that had no matching flow in the flow 47 * table that could not be sent to userspace (normally due to an overflow in 48 * one of the datapath's queues). 49 * @n_mask_hit: Number of masks looked up for flow match. 50 * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked 51 * up per packet. 52 */ 53struct dp_stats_percpu { 54 u64 n_hit; 55 u64 n_missed; 56 u64 n_lost; 57 u64 n_mask_hit; 58 struct u64_stats_sync syncp; 59}; 60 61/** 62 * struct datapath - datapath for flow-based packet switching 63 * @rcu: RCU callback head for deferred destruction. 64 * @list_node: Element in global 'dps' list. 65 * @table: flow table. 66 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by 67 * ovs_mutex and RCU. 68 * @stats_percpu: Per-CPU datapath statistics. 69 * @net: Reference to net namespace. 70 * 71 * Context: See the comment on locking at the top of datapath.c for additional 72 * locking information. 73 */ 74struct datapath { 75 struct rcu_head rcu; 76 struct list_head list_node; 77 78 /* Flow table. */ 79 struct flow_table table; 80 81 /* Switch ports. */ 82 struct hlist_head *ports; 83 84 /* Stats. */ 85 struct dp_stats_percpu __percpu *stats_percpu; 86 87 /* Network namespace ref. */ 88 possible_net_t net; 89 90 u32 user_features; 91}; 92 93/** 94 * struct ovs_skb_cb - OVS data in skb CB 95 * @egress_tun_key: Tunnel information about this packet on egress path. 96 * NULL if the packet is not being tunneled. 97 * @input_vport: The original vport packet came in on. This value is cached 98 * when a packet is received by OVS. 99 */ 100struct ovs_skb_cb { 101 struct ovs_tunnel_info *egress_tun_info; 102 struct vport *input_vport; 103}; 104#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) 105 106/** 107 * struct dp_upcall - metadata to include with a packet to send to userspace 108 * @cmd: One of %OVS_PACKET_CMD_*. 109 * @userdata: If nonnull, its variable-length value is passed to userspace as 110 * %OVS_PACKET_ATTR_USERDATA. 111 * @portid: Netlink portid to which packet should be sent. If @portid is 0 112 * then no packet is sent and the packet is accounted in the datapath's @n_lost 113 * counter. 114 * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY. 115 */ 116struct dp_upcall_info { 117 const struct ovs_tunnel_info *egress_tun_info; 118 const struct nlattr *userdata; 119 u32 portid; 120 u8 cmd; 121}; 122 123/** 124 * struct ovs_net - Per net-namespace data for ovs. 125 * @dps: List of datapaths to enable dumping them all out. 126 * Protected by genl_mutex. 127 */ 128struct ovs_net { 129 struct list_head dps; 130 struct work_struct dp_notify_work; 131 struct vport_net vport_net; 132}; 133 134extern int ovs_net_id; 135void ovs_lock(void); 136void ovs_unlock(void); 137 138#ifdef CONFIG_LOCKDEP 139int lockdep_ovsl_is_held(void); 140#else 141#define lockdep_ovsl_is_held() 1 142#endif 143 144#define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held()) 145#define ovsl_dereference(p) \ 146 rcu_dereference_protected(p, lockdep_ovsl_is_held()) 147#define rcu_dereference_ovsl(p) \ 148 rcu_dereference_check(p, lockdep_ovsl_is_held()) 149 150static inline struct net *ovs_dp_get_net(const struct datapath *dp) 151{ 152 return read_pnet(&dp->net); 153} 154 155static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) 156{ 157 write_pnet(&dp->net, net); 158} 159 160struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); 161 162static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) 163{ 164 WARN_ON_ONCE(!rcu_read_lock_held()); 165 return ovs_lookup_vport(dp, port_no); 166} 167 168static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) 169{ 170 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); 171 return ovs_lookup_vport(dp, port_no); 172} 173 174static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) 175{ 176 ASSERT_OVSL(); 177 return ovs_lookup_vport(dp, port_no); 178} 179 180extern struct notifier_block ovs_dp_device_notifier; 181extern struct genl_family dp_vport_genl_family; 182 183void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key); 184void ovs_dp_detach_port(struct vport *); 185int ovs_dp_upcall(struct datapath *, struct sk_buff *, 186 const struct sw_flow_key *, const struct dp_upcall_info *); 187 188const char *ovs_dp_name(const struct datapath *dp); 189struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq, 190 u8 cmd); 191 192int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, 193 const struct sw_flow_actions *, struct sw_flow_key *); 194 195void ovs_dp_notify_wq(struct work_struct *work); 196 197int action_fifos_init(void); 198void action_fifos_exit(void); 199 200#define OVS_NLERR(logging_allowed, fmt, ...) \ 201do { \ 202 if (logging_allowed && net_ratelimit()) \ 203 pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \ 204} while (0) 205#endif /* datapath.h */ 206