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 #include <net/ip_tunnels.h> 29 30 #include "conntrack.h" 31 #include "flow.h" 32 #include "flow_table.h" 33 34 #define DP_MAX_PORTS USHRT_MAX 35 #define DP_VPORT_HASH_BUCKETS 1024 36 37 #define SAMPLE_ACTION_DEPTH 3 38 39 /** 40 * struct dp_stats_percpu - per-cpu packet processing statistics for a given 41 * datapath. 42 * @n_hit: Number of received packets for which a matching flow was found in 43 * the flow table. 44 * @n_miss: Number of received packets that had no matching flow in the flow 45 * table. The sum of @n_hit and @n_miss is the number of packets that have 46 * been received by the datapath. 47 * @n_lost: Number of received packets that had no matching flow in the flow 48 * table that could not be sent to userspace (normally due to an overflow in 49 * one of the datapath's queues). 50 * @n_mask_hit: Number of masks looked up for flow match. 51 * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked 52 * up per packet. 53 */ 54 struct dp_stats_percpu { 55 u64 n_hit; 56 u64 n_missed; 57 u64 n_lost; 58 u64 n_mask_hit; 59 struct u64_stats_sync syncp; 60 }; 61 62 /** 63 * struct datapath - datapath for flow-based packet switching 64 * @rcu: RCU callback head for deferred destruction. 65 * @list_node: Element in global 'dps' list. 66 * @table: flow table. 67 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by 68 * ovs_mutex and RCU. 69 * @stats_percpu: Per-CPU datapath statistics. 70 * @net: Reference to net namespace. 71 * 72 * Context: See the comment on locking at the top of datapath.c for additional 73 * locking information. 74 */ 75 struct datapath { 76 struct rcu_head rcu; 77 struct list_head list_node; 78 79 /* Flow table. */ 80 struct flow_table table; 81 82 /* Switch ports. */ 83 struct hlist_head *ports; 84 85 /* Stats. */ 86 struct dp_stats_percpu __percpu *stats_percpu; 87 88 /* Network namespace ref. */ 89 possible_net_t net; 90 91 u32 user_features; 92 }; 93 94 /** 95 * struct ovs_skb_cb - OVS data in skb CB 96 * @input_vport: The original vport packet came in on. This value is cached 97 * when a packet is received by OVS. 98 * @mru: The maximum received fragement size; 0 if the packet is not 99 * fragmented. 100 */ 101 struct ovs_skb_cb { 102 struct vport *input_vport; 103 u16 mru; 104 }; 105 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) 106 107 /** 108 * struct dp_upcall - metadata to include with a packet to send to userspace 109 * @cmd: One of %OVS_PACKET_CMD_*. 110 * @userdata: If nonnull, its variable-length value is passed to userspace as 111 * %OVS_PACKET_ATTR_USERDATA. 112 * @portid: Netlink portid to which packet should be sent. If @portid is 0 113 * then no packet is sent and the packet is accounted in the datapath's @n_lost 114 * counter. 115 * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY. 116 * @mru: If not zero, Maximum received IP fragment size. 117 */ 118 struct dp_upcall_info { 119 struct ip_tunnel_info *egress_tun_info; 120 const struct nlattr *userdata; 121 const struct nlattr *actions; 122 int actions_len; 123 u32 portid; 124 u8 cmd; 125 u16 mru; 126 }; 127 128 /** 129 * struct ovs_net - Per net-namespace data for ovs. 130 * @dps: List of datapaths to enable dumping them all out. 131 * Protected by genl_mutex. 132 */ 133 struct ovs_net { 134 struct list_head dps; 135 struct work_struct dp_notify_work; 136 137 /* Module reference for configuring conntrack. */ 138 bool xt_label; 139 }; 140 141 extern int ovs_net_id; 142 void ovs_lock(void); 143 void ovs_unlock(void); 144 145 #ifdef CONFIG_LOCKDEP 146 int lockdep_ovsl_is_held(void); 147 #else 148 #define lockdep_ovsl_is_held() 1 149 #endif 150 151 #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held()) 152 #define ovsl_dereference(p) \ 153 rcu_dereference_protected(p, lockdep_ovsl_is_held()) 154 #define rcu_dereference_ovsl(p) \ 155 rcu_dereference_check(p, lockdep_ovsl_is_held()) 156 157 static inline struct net *ovs_dp_get_net(const struct datapath *dp) 158 { 159 return read_pnet(&dp->net); 160 } 161 162 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) 163 { 164 write_pnet(&dp->net, net); 165 } 166 167 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); 168 169 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) 170 { 171 WARN_ON_ONCE(!rcu_read_lock_held()); 172 return ovs_lookup_vport(dp, port_no); 173 } 174 175 static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) 176 { 177 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); 178 return ovs_lookup_vport(dp, port_no); 179 } 180 181 static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) 182 { 183 ASSERT_OVSL(); 184 return ovs_lookup_vport(dp, port_no); 185 } 186 187 extern struct notifier_block ovs_dp_device_notifier; 188 extern struct genl_family dp_vport_genl_family; 189 190 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key); 191 void ovs_dp_detach_port(struct vport *); 192 int ovs_dp_upcall(struct datapath *, struct sk_buff *, 193 const struct sw_flow_key *, const struct dp_upcall_info *); 194 195 const char *ovs_dp_name(const struct datapath *dp); 196 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq, 197 u8 cmd); 198 199 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, 200 const struct sw_flow_actions *, struct sw_flow_key *); 201 202 void ovs_dp_notify_wq(struct work_struct *work); 203 204 int action_fifos_init(void); 205 void action_fifos_exit(void); 206 207 /* 'KEY' must not have any bits set outside of the 'MASK' */ 208 #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK))) 209 #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK)) 210 211 #define OVS_NLERR(logging_allowed, fmt, ...) \ 212 do { \ 213 if (logging_allowed && net_ratelimit()) \ 214 pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \ 215 } while (0) 216 #endif /* datapath.h */ 217