/* * Copyright (c) 2007-2012 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA */ #ifndef DATAPATH_H#define DATAPATH_H 1 #include <asm/page.h>#include <linux/kernel.h>#include <linux/mutex.h>#include <linux/netdevice.h>#include <linux/skbuff.h>#include <linux/u64_stats_sync.h> #include "flow.h"#include "vport.h" #define DP_MAX_PORTS           USHRT_MAX#define DP_VPORT_HASH_BUCKETS  1024 #define SAMPLE_ACTION_DEPTH 3 /** * struct dp_stats_percpu - per-cpu packet processing statistics for a given * datapath. * @n_hit: Number of received packets for which a matching flow was found in * the flow table. * @n_miss: Number of received packets that had no matching flow in the flow * table.  The sum of @n_hit and @n_miss is the number of packets that have * been received by the datapath. * @n_lost: Number of received packets that had no matching flow in the flow * table that could not be sent to userspace (normally due to an overflow in * one of the datapath's queues). */struct dp_stats_percpu {	u64 n_hit;	u64 n_missed;	u64 n_lost;	struct u64_stats_sync sync;}; /** * struct datapath - datapath for flow-based packet switching * @rcu: RCU callback head for deferred destruction. * @list_node: Element in global 'dps' list. * @n_flows: Number of flows currently in flow table. * @table: Current flow table.  Protected by genl_lock and RCU. * @ports: Hash table for ports.  %OVSP_LOCAL port always exists.  Protected by * RTNL and RCU. * @stats_percpu: Per-CPU datapath statistics. * @net: Reference to net namespace. * * Context: See the comment on locking at the top of datapath.c for additional * locking information. */struct datapath {	struct rcu_head rcu;	struct list_head list_node; 	/* Flow table. */	struct flow_table __rcu *table; 	/* Switch ports. */	struct hlist_head *ports; 	/* Stats. */	struct dp_stats_percpu __percpu *stats_percpu; #ifdef CONFIG_NET_NS	/* Network namespace ref. */	struct net *net;#endif}; struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no){	WARN_ON_ONCE(!rcu_read_lock_held());	return ovs_lookup_vport(dp, port_no);} static inline struct vport *ovs_vport_rtnl_rcu(const struct datapath *dp, int port_no){	WARN_ON_ONCE(!rcu_read_lock_held() && !rtnl_is_locked());	return ovs_lookup_vport(dp, port_no);} static inline struct vport *ovs_vport_rtnl(const struct datapath *dp, int port_no){	ASSERT_RTNL();	return ovs_lookup_vport(dp, port_no);} /** * struct ovs_skb_cb - OVS data in skb CB * @flow: The flow associated with this packet.  May be %NULL if no flow. */struct ovs_skb_cb {	struct sw_flow		*flow;};#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) /** * struct dp_upcall - metadata to include with a packet to send to userspace * @cmd: One of %OVS_PACKET_CMD_*. * @key: Becomes %OVS_PACKET_ATTR_KEY.  Must be nonnull. * @userdata: If nonnull, its u64 value is extracted and passed to userspace as * %OVS_PACKET_ATTR_USERDATA. * @pid: Netlink PID to which packet should be sent.  If @pid is 0 then no * packet is sent and the packet is accounted in the datapath's @n_lost * counter. */struct dp_upcall_info {	u8 cmd;	const struct sw_flow_key *key;	const struct nlattr *userdata;	u32 portid;}; static inline struct net *ovs_dp_get_net(struct datapath *dp){	return read_pnet(&dp->net);} static inline void ovs_dp_set_net(struct datapath *dp, struct net *net){	write_pnet(&dp->net, net);} extern struct notifier_block ovs_dp_device_notifier;extern struct genl_multicast_group ovs_dp_vport_multicast_group; void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);void ovs_dp_detach_port(struct vport *);int ovs_dp_upcall(struct datapath *, struct sk_buff *,		  const struct dp_upcall_info *); const char *ovs_dp_name(const struct datapath *dp);struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,					 u8 cmd); int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);#endif /* datapath.h */