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/*
* Copyright (c) 2009, 2010, 2011 Nicira Networks.
* Distributed under the terms of the GNU GPL version 2.
*
* Significant portions of this file may be copied from parts of the Linux
* kernel, by Linus Torvalds and others.
*/
/* Interface exported by openvswitch_mod. */
#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/seqlock.h>
#include <linux/skbuff.h>
#include <linux/version.h>
#include "checksum.h"
#include "compat.h"
#include "flow.h"
#include "dp_sysfs.h"
#include "vlan.h"
struct vport;
#define DP_MAX_PORTS 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;
seqcount_t seqlock;
};
/**
* struct datapath - datapath for flow-based packet switching
* @rcu: RCU callback head for deferred destruction.
* @list_node: Element in global 'dps' list.
* @ifobj: Represents /sys/class/net/<devname>/brif. Protected by RTNL.
* @n_flows: Number of flows currently in flow table.
* @table: Current flow table. Protected by genl_lock and RCU.
* @ports: Map from port number to &struct vport. %OVSP_LOCAL port
* always exists, other ports may be %NULL. Protected by RTNL and RCU.
* @port_list: List of all ports in @ports in arbitrary order. RTNL required
* to iterate or modify.
* @stats_percpu: Per-CPU datapath statistics.
*
* 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;
struct kobject ifobj;
/* Flow table. */
struct flow_table __rcu *table;
/* Switch ports. */
struct vport __rcu *ports[DP_MAX_PORTS];
struct list_head port_list;
/* Stats. */
struct dp_stats_percpu __percpu *stats_percpu;
};
/**
* struct ovs_skb_cb - OVS data in skb CB
* @flow: The flow associated with this packet. May be %NULL if no flow.
* @tun_id: ID of the tunnel that encapsulated this packet. It is 0 if the
* @ip_summed: Consistently stores L4 checksumming status across different
* kernel versions.
* @csum_start: Stores the offset from which to start checksumming independent
* of the transport header on all kernel versions.
* packet was not received on a tunnel.
* @vlan_tci: Provides a substitute for the skb->vlan_tci field on kernels
* before 2.6.27.
*/
struct ovs_skb_cb {
struct sw_flow *flow;
__be64 tun_id;
#ifdef NEED_CSUM_NORMALIZE
enum csum_type ip_summed;
u16 csum_start;
#endif
#ifdef NEED_VLAN_FIELD
u16 vlan_tci;
#endif
};
#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 pid;
};
extern struct notifier_block dp_device_notifier;
extern struct genl_multicast_group dp_vport_multicast_group;
extern int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
void dp_process_received_packet(struct vport *, struct sk_buff *);
void dp_detach_port(struct vport *);
int dp_upcall(struct datapath *, struct sk_buff *,
const struct dp_upcall_info *);
struct datapath *get_dp(int dp_idx);
const char *dp_name(const struct datapath *dp);
struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
u8 cmd);
int execute_actions(struct datapath *dp, struct sk_buff *skb);
#endif /* datapath.h */
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