datapath/vport-internal_dev.c

   1 /*
   2  * Copyright (c) 2007-2011 Nicira Networks.
   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 #include <linux/version.h>
  27
  28 #include "checksum.h"
  29 #include "datapath.h"
  30 #include "vlan.h"
  31 #include "vport-generic.h"
  32 #include "vport-internal_dev.h"
  33 #include "vport-netdev.h"
  34
  35 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
  36 #define HAVE_NET_DEVICE_OPS
  37 #endif
  38
  39 struct internal_dev {
  40         struct vport *vport;
  41 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
  42         struct net_device_stats stats;
  43 #endif
  44 };
  45
  46 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
  47 {
  48         return netdev_priv(netdev);
  49 }
  50
  51 /* This function is only called by the kernel network layer.*/
  52 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
  53 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
  54                                                         struct rtnl_link_stats64 *stats)
  55 {
  56 #else
  57 static struct net_device_stats *internal_dev_sys_stats(struct net_device *netdev)
  58 {
  59 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
  60         struct net_device_stats *stats = &internal_dev_priv(netdev)->stats;
  61 #else
  62         struct net_device_stats *stats = &netdev->stats;
  63 #endif
  64 #endif
  65         struct vport *vport = ovs_internal_dev_get_vport(netdev);
  66         struct ovs_vport_stats vport_stats;
  67
  68         ovs_vport_get_stats(vport, &vport_stats);
  69
  70         /* The tx and rx stats need to be swapped because the
  71          * switch and host OS have opposite perspectives. */
  72         stats->rx_packets       = vport_stats.tx_packets;
  73         stats->tx_packets       = vport_stats.rx_packets;
  74         stats->rx_bytes         = vport_stats.tx_bytes;
  75         stats->tx_bytes         = vport_stats.rx_bytes;
  76         stats->rx_errors        = vport_stats.tx_errors;
  77         stats->tx_errors        = vport_stats.rx_errors;
  78         stats->rx_dropped       = vport_stats.tx_dropped;
  79         stats->tx_dropped       = vport_stats.rx_dropped;
  80
  81         return stats;
  82 }
  83
  84 static int internal_dev_mac_addr(struct net_device *dev, void *p)
  85 {
  86         struct sockaddr *addr = p;
  87
  88         if (!is_valid_ether_addr(addr->sa_data))
  89                 return -EADDRNOTAVAIL;
  90         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  91         return 0;
  92 }
  93
  94 /* Called with rcu_read_lock_bh. */
  95 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  96 {
  97         if (unlikely(compute_ip_summed(skb, true))) {
  98                 kfree_skb(skb);
  99                 return 0;
 100         }
 101
 102         vlan_copy_skb_tci(skb);
 103         OVS_CB(skb)->flow = NULL;
 104
 105         rcu_read_lock();
 106         ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
 107         rcu_read_unlock();
 108         return 0;
 109 }
 110
 111 static int internal_dev_open(struct net_device *netdev)
 112 {
 113         netif_start_queue(netdev);
 114         return 0;
 115 }
 116
 117 static int internal_dev_stop(struct net_device *netdev)
 118 {
 119         netif_stop_queue(netdev);
 120         return 0;
 121 }
 122
 123 static void internal_dev_getinfo(struct net_device *netdev,
 124                                  struct ethtool_drvinfo *info)
 125 {
 126         strcpy(info->driver, "openvswitch");
 127 }
 128
 129 static const struct ethtool_ops internal_dev_ethtool_ops = {
 130         .get_drvinfo    = internal_dev_getinfo,
 131         .get_link       = ethtool_op_get_link,
 132 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
 133         .get_sg         = ethtool_op_get_sg,
 134         .set_sg         = ethtool_op_set_sg,
 135         .get_tx_csum    = ethtool_op_get_tx_csum,
 136         .set_tx_csum    = ethtool_op_set_tx_hw_csum,
 137         .get_tso        = ethtool_op_get_tso,
 138         .set_tso        = ethtool_op_set_tso,
 139 #endif
 140 };
 141
 142 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 143 {
 144         if (new_mtu < 68)
 145                 return -EINVAL;
 146
 147         netdev->mtu = new_mtu;
 148         return 0;
 149 }
 150
 151 static int internal_dev_do_ioctl(struct net_device *dev,
 152                                  struct ifreq *ifr, int cmd)
 153 {
 154         if (ovs_dp_ioctl_hook)
 155                 return ovs_dp_ioctl_hook(dev, ifr, cmd);
 156
 157         return -EOPNOTSUPP;
 158 }
 159
 160 static void internal_dev_destructor(struct net_device *dev)
 161 {
 162         struct vport *vport = ovs_internal_dev_get_vport(dev);
 163
 164         ovs_vport_free(vport);
 165         free_netdev(dev);
 166 }
 167
 168 #ifdef HAVE_NET_DEVICE_OPS
 169 static const struct net_device_ops internal_dev_netdev_ops = {
 170         .ndo_open = internal_dev_open,
 171         .ndo_stop = internal_dev_stop,
 172         .ndo_start_xmit = internal_dev_xmit,
 173         .ndo_set_mac_address = internal_dev_mac_addr,
 174         .ndo_do_ioctl = internal_dev_do_ioctl,
 175         .ndo_change_mtu = internal_dev_change_mtu,
 176 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
 177         .ndo_get_stats64 = internal_dev_get_stats,
 178 #else
 179         .ndo_get_stats = internal_dev_sys_stats,
 180 #endif
 181 };
 182 #endif
 183
 184 static void do_setup(struct net_device *netdev)
 185 {
 186         ether_setup(netdev);
 187
 188 #ifdef HAVE_NET_DEVICE_OPS
 189         netdev->netdev_ops = &internal_dev_netdev_ops;
 190 #else
 191         netdev->do_ioctl = internal_dev_do_ioctl;
 192         netdev->get_stats = internal_dev_sys_stats;
 193         netdev->hard_start_xmit = internal_dev_xmit;
 194         netdev->open = internal_dev_open;
 195         netdev->stop = internal_dev_stop;
 196         netdev->set_mac_address = internal_dev_mac_addr;
 197         netdev->change_mtu = internal_dev_change_mtu;
 198 #endif
 199
 200         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 201         netdev->destructor = internal_dev_destructor;
 202         SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
 203         netdev->tx_queue_len = 0;
 204
 205         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 206                                 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
 207
 208 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)
 209         netdev->vlan_features = netdev->features;
 210         netdev->features |= NETIF_F_HW_VLAN_TX;
 211 #endif
 212
 213 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
 214         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 215 #endif
 216         random_ether_addr(netdev->dev_addr);
 217 }
 218
 219 static struct vport *internal_dev_create(const struct vport_parms *parms)
 220 {
 221         struct vport *vport;
 222         struct netdev_vport *netdev_vport;
 223         struct internal_dev *internal_dev;
 224         int err;
 225
 226         vport = ovs_vport_alloc(sizeof(struct netdev_vport),
 227                                 &ovs_internal_vport_ops, parms);
 228         if (IS_ERR(vport)) {
 229                 err = PTR_ERR(vport);
 230                 goto error;
 231         }
 232
 233         netdev_vport = netdev_vport_priv(vport);
 234
 235         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
 236                                          parms->name, do_setup);
 237         if (!netdev_vport->dev) {
 238                 err = -ENOMEM;
 239                 goto error_free_vport;
 240         }
 241
 242         internal_dev = internal_dev_priv(netdev_vport->dev);
 243         internal_dev->vport = vport;
 244
 245         err = register_netdevice(netdev_vport->dev);
 246         if (err)
 247                 goto error_free_netdev;
 248
 249         dev_set_promiscuity(netdev_vport->dev, 1);
 250         netif_start_queue(netdev_vport->dev);
 251
 252         return vport;
 253
 254 error_free_netdev:
 255         free_netdev(netdev_vport->dev);
 256 error_free_vport:
 257         ovs_vport_free(vport);
 258 error:
 259         return ERR_PTR(err);
 260 }
 261
 262 static void internal_dev_destroy(struct vport *vport)
 263 {
 264         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 265
 266         netif_stop_queue(netdev_vport->dev);
 267         dev_set_promiscuity(netdev_vport->dev, -1);
 268
 269         /* unregister_netdevice() waits for an RCU grace period. */
 270         unregister_netdevice(netdev_vport->dev);
 271 }
 272
 273 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 274 {
 275         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 276         int len;
 277
 278 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
 279         if (unlikely(vlan_deaccel_tag(skb)))
 280                 return 0;
 281 #endif
 282
 283         len = skb->len;
 284         skb->dev = netdev;
 285         skb->pkt_type = PACKET_HOST;
 286         skb->protocol = eth_type_trans(skb, netdev);
 287         forward_ip_summed(skb, false);
 288
 289         netif_rx(skb);
 290
 291 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
 292         netdev->last_rx = jiffies;
 293 #endif
 294
 295         return len;
 296 }
 297
 298 const struct vport_ops ovs_internal_vport_ops = {
 299         .type           = OVS_VPORT_TYPE_INTERNAL,
 300         .flags          = VPORT_F_REQUIRED | VPORT_F_FLOW,
 301         .create         = internal_dev_create,
 302         .destroy        = internal_dev_destroy,
 303         .set_addr       = ovs_netdev_set_addr,
 304         .get_name       = ovs_netdev_get_name,
 305         .get_addr       = ovs_netdev_get_addr,
 306         .get_kobj       = ovs_netdev_get_kobj,
 307         .get_dev_flags  = ovs_netdev_get_dev_flags,
 308         .is_running     = ovs_netdev_is_running,
 309         .get_operstate  = ovs_netdev_get_operstate,
 310         .get_ifindex    = ovs_netdev_get_ifindex,
 311         .get_mtu        = ovs_netdev_get_mtu,
 312         .send           = internal_dev_recv,
 313 };
 314
 315 int ovs_is_internal_dev(const struct net_device *netdev)
 316 {
 317 #ifdef HAVE_NET_DEVICE_OPS
 318         return netdev->netdev_ops == &internal_dev_netdev_ops;
 319 #else
 320         return netdev->open == internal_dev_open;
 321 #endif
 322 }
 323
 324 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 325 {
 326         if (!ovs_is_internal_dev(netdev))
 327                 return NULL;
 328
 329         return internal_dev_priv(netdev)->vport;
 330 }