/* * 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 "flow_table.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). * @n_mask_hit: Number of masks looked up for flow match. *   @n_mask_hit / (@n_hit + @n_missed)  will be the average masks looked *   up per packet. */struct dp_stats_percpu {	u64 n_hit;	u64 n_missed;	u64 n_lost;	u64 n_mask_hit;	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. * @table: flow table. * @ports: Hash table for ports.  %OVSP_LOCAL port always exists.  Protected by * ovs_mutex 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 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 ovs_skb_cb - OVS data in skb CB * @flow: The flow associated with this packet.  May be %NULL if no flow. * @pkt_key: The flow information extracted from the packet.  Must be nonnull. * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the * packet is not being tunneled. */struct ovs_skb_cb {	struct sw_flow		*flow;	struct sw_flow_key	*pkt_key;	struct ovs_key_ipv4_tunnel  *tun_key;};#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 variable-length value is 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;}; /** * struct ovs_net - Per net-namespace data for ovs. * @dps: List of datapaths to enable dumping them all out. * Protected by genl_mutex. */struct ovs_net {	struct list_head dps;	struct work_struct dp_notify_work;	struct vport_net vport_net;}; extern int ovs_net_id;void ovs_lock(void);void ovs_unlock(void); #ifdef CONFIG_LOCKDEPint lockdep_ovsl_is_held(void);#else#define lockdep_ovsl_is_held()	1#endif #define ASSERT_OVSL()		WARN_ON(unlikely(!lockdep_ovsl_is_held()))#define ovsl_dereference(p)					\	rcu_dereference_protected(p, lockdep_ovsl_is_held()) 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);} 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_ovsl_rcu(const struct datapath *dp, int port_no){	WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());	return ovs_lookup_vport(dp, port_no);} static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no){	ASSERT_OVSL();	return ovs_lookup_vport(dp, port_no);} extern struct notifier_block ovs_dp_device_notifier;extern struct genl_family dp_vport_genl_family;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);void ovs_dp_notify_wq(struct work_struct *work); #define OVS_NLERR(fmt, ...) \	pr_info_once("netlink: " fmt, ##__VA_ARGS__) #endif /* datapath.h */