datapath.h

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/*
 * 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 {
    u64 n_hit;
    u64 n_missed;
    u64 n_lost;
    struct u64_stats_sync sync;
};

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 {
    struct sw_flow      *flow;
};
#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)

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 */