linux/net/openvswitch/vport-internal_dev.c
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   1/*
   2 * Copyright (c) 2007-2012 Nicira, Inc.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of version 2 of the GNU General Public
   6 * License as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful, but
   9 * WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11 * General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program; if not, write to the Free Software
  15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16 * 02110-1301, USA
  17 */
  18
  19#include <linux/hardirq.h>
  20#include <linux/if_vlan.h>
  21#include <linux/kernel.h>
  22#include <linux/netdevice.h>
  23#include <linux/etherdevice.h>
  24#include <linux/ethtool.h>
  25#include <linux/skbuff.h>
  26
  27#include <net/dst.h>
  28#include <net/xfrm.h>
  29
  30#include "datapath.h"
  31#include "vport-internal_dev.h"
  32#include "vport-netdev.h"
  33
  34struct internal_dev {
  35        struct vport *vport;
  36};
  37
  38static struct internal_dev *internal_dev_priv(struct net_device *netdev)
  39{
  40        return netdev_priv(netdev);
  41}
  42
  43/* This function is only called by the kernel network layer.*/
  44static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
  45                                                        struct rtnl_link_stats64 *stats)
  46{
  47        struct vport *vport = ovs_internal_dev_get_vport(netdev);
  48        struct ovs_vport_stats vport_stats;
  49
  50        ovs_vport_get_stats(vport, &vport_stats);
  51
  52        /* The tx and rx stats need to be swapped because the
  53         * switch and host OS have opposite perspectives. */
  54        stats->rx_packets       = vport_stats.tx_packets;
  55        stats->tx_packets       = vport_stats.rx_packets;
  56        stats->rx_bytes         = vport_stats.tx_bytes;
  57        stats->tx_bytes         = vport_stats.rx_bytes;
  58        stats->rx_errors        = vport_stats.tx_errors;
  59        stats->tx_errors        = vport_stats.rx_errors;
  60        stats->rx_dropped       = vport_stats.tx_dropped;
  61        stats->tx_dropped       = vport_stats.rx_dropped;
  62
  63        return stats;
  64}
  65
  66static int internal_dev_mac_addr(struct net_device *dev, void *p)
  67{
  68        struct sockaddr *addr = p;
  69
  70        if (!is_valid_ether_addr(addr->sa_data))
  71                return -EADDRNOTAVAIL;
  72        dev->addr_assign_type &= ~NET_ADDR_RANDOM;
  73        memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  74        return 0;
  75}
  76
  77/* Called with rcu_read_lock_bh. */
  78static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  79{
  80        rcu_read_lock();
  81        ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
  82        rcu_read_unlock();
  83        return 0;
  84}
  85
  86static int internal_dev_open(struct net_device *netdev)
  87{
  88        netif_start_queue(netdev);
  89        return 0;
  90}
  91
  92static int internal_dev_stop(struct net_device *netdev)
  93{
  94        netif_stop_queue(netdev);
  95        return 0;
  96}
  97
  98static void internal_dev_getinfo(struct net_device *netdev,
  99                                 struct ethtool_drvinfo *info)
 100{
 101        strcpy(info->driver, "openvswitch");
 102}
 103
 104static const struct ethtool_ops internal_dev_ethtool_ops = {
 105        .get_drvinfo    = internal_dev_getinfo,
 106        .get_link       = ethtool_op_get_link,
 107};
 108
 109static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 110{
 111        if (new_mtu < 68)
 112                return -EINVAL;
 113
 114        netdev->mtu = new_mtu;
 115        return 0;
 116}
 117
 118static void internal_dev_destructor(struct net_device *dev)
 119{
 120        struct vport *vport = ovs_internal_dev_get_vport(dev);
 121
 122        ovs_vport_free(vport);
 123        free_netdev(dev);
 124}
 125
 126static const struct net_device_ops internal_dev_netdev_ops = {
 127        .ndo_open = internal_dev_open,
 128        .ndo_stop = internal_dev_stop,
 129        .ndo_start_xmit = internal_dev_xmit,
 130        .ndo_set_mac_address = internal_dev_mac_addr,
 131        .ndo_change_mtu = internal_dev_change_mtu,
 132        .ndo_get_stats64 = internal_dev_get_stats,
 133};
 134
 135static void do_setup(struct net_device *netdev)
 136{
 137        ether_setup(netdev);
 138
 139        netdev->netdev_ops = &internal_dev_netdev_ops;
 140
 141        netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 142        netdev->destructor = internal_dev_destructor;
 143        SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
 144        netdev->tx_queue_len = 0;
 145
 146        netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 147                                NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
 148
 149        netdev->vlan_features = netdev->features;
 150        netdev->features |= NETIF_F_HW_VLAN_TX;
 151        netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 152        eth_hw_addr_random(netdev);
 153}
 154
 155static struct vport *internal_dev_create(const struct vport_parms *parms)
 156{
 157        struct vport *vport;
 158        struct netdev_vport *netdev_vport;
 159        struct internal_dev *internal_dev;
 160        int err;
 161
 162        vport = ovs_vport_alloc(sizeof(struct netdev_vport),
 163                                &ovs_internal_vport_ops, parms);
 164        if (IS_ERR(vport)) {
 165                err = PTR_ERR(vport);
 166                goto error;
 167        }
 168
 169        netdev_vport = netdev_vport_priv(vport);
 170
 171        netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
 172                                         parms->name, do_setup);
 173        if (!netdev_vport->dev) {
 174                err = -ENOMEM;
 175                goto error_free_vport;
 176        }
 177
 178        internal_dev = internal_dev_priv(netdev_vport->dev);
 179        internal_dev->vport = vport;
 180
 181        err = register_netdevice(netdev_vport->dev);
 182        if (err)
 183                goto error_free_netdev;
 184
 185        dev_set_promiscuity(netdev_vport->dev, 1);
 186        netif_start_queue(netdev_vport->dev);
 187
 188        return vport;
 189
 190error_free_netdev:
 191        free_netdev(netdev_vport->dev);
 192error_free_vport:
 193        ovs_vport_free(vport);
 194error:
 195        return ERR_PTR(err);
 196}
 197
 198static void internal_dev_destroy(struct vport *vport)
 199{
 200        struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 201
 202        netif_stop_queue(netdev_vport->dev);
 203        dev_set_promiscuity(netdev_vport->dev, -1);
 204
 205        /* unregister_netdevice() waits for an RCU grace period. */
 206        unregister_netdevice(netdev_vport->dev);
 207}
 208
 209static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 210{
 211        struct net_device *netdev = netdev_vport_priv(vport)->dev;
 212        int len;
 213
 214        len = skb->len;
 215
 216        skb_dst_drop(skb);
 217        nf_reset(skb);
 218        secpath_reset(skb);
 219
 220        skb->dev = netdev;
 221        skb->pkt_type = PACKET_HOST;
 222        skb->protocol = eth_type_trans(skb, netdev);
 223
 224        netif_rx(skb);
 225
 226        return len;
 227}
 228
 229const struct vport_ops ovs_internal_vport_ops = {
 230        .type           = OVS_VPORT_TYPE_INTERNAL,
 231        .create         = internal_dev_create,
 232        .destroy        = internal_dev_destroy,
 233        .get_name       = ovs_netdev_get_name,
 234        .get_ifindex    = ovs_netdev_get_ifindex,
 235        .send           = internal_dev_recv,
 236};
 237
 238int ovs_is_internal_dev(const struct net_device *netdev)
 239{
 240        return netdev->netdev_ops == &internal_dev_netdev_ops;
 241}
 242
 243struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 244{
 245        if (!ovs_is_internal_dev(netdev))
 246                return NULL;
 247
 248        return internal_dev_priv(netdev)->vport;
 249}
 250
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