vport-internal_dev.c

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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
 */

#include <linux/hardirq.h>
#include <linux/if_vlan.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>

#include <net/dst.h>
#include <net/xfrm.h>

#include "datapath.h"
#include "vport-internal_dev.h"
#include "vport-netdev.h"

struct internal_dev {
    struct vport *vport;
};

static struct internal_dev *internal_dev_priv(struct net_device *netdev)
{
    return netdev_priv(netdev);
}

/* This function is only called by the kernel network layer.*/
static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
                            struct rtnl_link_stats64 *stats)
{
    struct vport *vport = ovs_internal_dev_get_vport(netdev);
    struct ovs_vport_stats vport_stats;

    ovs_vport_get_stats(vport, &vport_stats);

    /* The tx and rx stats need to be swapped because the
     * switch and host OS have opposite perspectives. */
    stats->rx_packets   = vport_stats.tx_packets;
    stats->tx_packets   = vport_stats.rx_packets;
    stats->rx_bytes     = vport_stats.tx_bytes;
    stats->tx_bytes     = vport_stats.rx_bytes;
    stats->rx_errors    = vport_stats.tx_errors;
    stats->tx_errors    = vport_stats.rx_errors;
    stats->rx_dropped   = vport_stats.tx_dropped;
    stats->tx_dropped   = vport_stats.rx_dropped;

    return stats;
}

static int internal_dev_mac_addr(struct net_device *dev, void *p)
{
    struct sockaddr *addr = p;

    if (!is_valid_ether_addr(addr->sa_data))
        return -EADDRNOTAVAIL;
    dev->addr_assign_type &= ~NET_ADDR_RANDOM;
    memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
    return 0;
}

/* Called with rcu_read_lock_bh. */
static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
{
    rcu_read_lock();
    ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
    rcu_read_unlock();
    return 0;
}

static int internal_dev_open(struct net_device *netdev)
{
    netif_start_queue(netdev);
    return 0;
}

static int internal_dev_stop(struct net_device *netdev)
{
    netif_stop_queue(netdev);
    return 0;
}

static void internal_dev_getinfo(struct net_device *netdev,
                 struct ethtool_drvinfo *info)
{
    strcpy(info->driver, "openvswitch");
}

static const struct ethtool_ops internal_dev_ethtool_ops = {
    .get_drvinfo    = internal_dev_getinfo,
    .get_link   = ethtool_op_get_link,
};

static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
{
    if (new_mtu < 68)
        return -EINVAL;

    netdev->mtu = new_mtu;
    return 0;
}

static void internal_dev_destructor(struct net_device *dev)
{
    struct vport *vport = ovs_internal_dev_get_vport(dev);

    ovs_vport_free(vport);
    free_netdev(dev);
}

static const struct net_device_ops internal_dev_netdev_ops = {
    .ndo_open = internal_dev_open,
    .ndo_stop = internal_dev_stop,
    .ndo_start_xmit = internal_dev_xmit,
    .ndo_set_mac_address = internal_dev_mac_addr,
    .ndo_change_mtu = internal_dev_change_mtu,
    .ndo_get_stats64 = internal_dev_get_stats,
};

static void do_setup(struct net_device *netdev)
{
    ether_setup(netdev);

    netdev->netdev_ops = &internal_dev_netdev_ops;

    netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
    netdev->destructor = internal_dev_destructor;
    SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
    netdev->tx_queue_len = 0;

    netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
               NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;

    netdev->vlan_features = netdev->features;
    netdev->features |= NETIF_F_HW_VLAN_TX;
    netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
    eth_hw_addr_random(netdev);
}

static struct vport *internal_dev_create(const struct vport_parms *parms)
{
    struct vport *vport;
    struct netdev_vport *netdev_vport;
    struct internal_dev *internal_dev;
    int err;

    vport = ovs_vport_alloc(sizeof(struct netdev_vport),
                &ovs_internal_vport_ops, parms);
    if (IS_ERR(vport)) {
        err = PTR_ERR(vport);
        goto error;
    }

    netdev_vport = netdev_vport_priv(vport);

    netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
                     parms->name, do_setup);
    if (!netdev_vport->dev) {
        err = -ENOMEM;
        goto error_free_vport;
    }

    dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
    internal_dev = internal_dev_priv(netdev_vport->dev);
    internal_dev->vport = vport;

    /* Restrict bridge port to current netns. */
    if (vport->port_no == OVSP_LOCAL)
        netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;

    err = register_netdevice(netdev_vport->dev);
    if (err)
        goto error_free_netdev;

    dev_set_promiscuity(netdev_vport->dev, 1);
    netif_start_queue(netdev_vport->dev);

    return vport;

error_free_netdev:
    free_netdev(netdev_vport->dev);
error_free_vport:
    ovs_vport_free(vport);
error:
    return ERR_PTR(err);
}

static void internal_dev_destroy(struct vport *vport)
{
    struct netdev_vport *netdev_vport = netdev_vport_priv(vport);

    netif_stop_queue(netdev_vport->dev);
    dev_set_promiscuity(netdev_vport->dev, -1);

    /* unregister_netdevice() waits for an RCU grace period. */
    unregister_netdevice(netdev_vport->dev);
}

static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
{
    struct net_device *netdev = netdev_vport_priv(vport)->dev;
    int len;

    len = skb->len;

    skb_dst_drop(skb);
    nf_reset(skb);
    secpath_reset(skb);

    skb->dev = netdev;
    skb->pkt_type = PACKET_HOST;
    skb->protocol = eth_type_trans(skb, netdev);

    netif_rx(skb);

    return len;
}

const struct vport_ops ovs_internal_vport_ops = {
    .type       = OVS_VPORT_TYPE_INTERNAL,
    .create     = internal_dev_create,
    .destroy    = internal_dev_destroy,
    .get_name   = ovs_netdev_get_name,
    .get_ifindex    = ovs_netdev_get_ifindex,
    .send       = internal_dev_recv,
};

int ovs_is_internal_dev(const struct net_device *netdev)
{
    return netdev->netdev_ops == &internal_dev_netdev_ops;
}

struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
{
    if (!ovs_is_internal_dev(netdev))
        return NULL;

    return internal_dev_priv(netdev)->vport;
}