datapath/vport-internal_dev.c

   1 /*
   2  * Copyright (c) 2009, 2010, 2011 Nicira Networks.
   3  * Distributed under the terms of the GNU GPL version 2.
   4  *
   5  * Significant portions of this file may be copied from parts of the Linux
   6  * kernel, by Linus Torvalds and others.
   7  */
   8
   9 #include <linux/if_vlan.h>
  10 #include <linux/kernel.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/ethtool.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/version.h>
  16
  17 #include "checksum.h"
  18 #include "datapath.h"
  19 #include "vlan.h"
  20 #include "vport-generic.h"
  21 #include "vport-internal_dev.h"
  22 #include "vport-netdev.h"
  23
  24 struct internal_dev {
  25         struct vport *vport;
  26         struct net_device_stats stats;
  27 };
  28
  29 static inline struct internal_dev *internal_dev_priv(struct net_device *netdev)
  30 {
  31         return netdev_priv(netdev);
  32 }
  33
  34 /* This function is only called by the kernel network layer.  It is not a vport
  35  * get_stats() function.  If a vport get_stats() function is defined that
  36  * results in this being called it will cause infinite recursion. */
  37 static struct net_device_stats *internal_dev_sys_stats(struct net_device *netdev)
  38 {
  39         struct vport *vport = internal_dev_get_vport(netdev);
  40         struct net_device_stats *stats = &internal_dev_priv(netdev)->stats;
  41
  42         if (vport) {
  43                 struct rtnl_link_stats64 vport_stats;
  44
  45                 vport_get_stats(vport, &vport_stats);
  46
  47                 /* The tx and rx stats need to be swapped because the switch
  48                  * and host OS have opposite perspectives. */
  49                 stats->rx_packets       = vport_stats.tx_packets;
  50                 stats->tx_packets       = vport_stats.rx_packets;
  51                 stats->rx_bytes         = vport_stats.tx_bytes;
  52                 stats->tx_bytes         = vport_stats.rx_bytes;
  53                 stats->rx_errors        = vport_stats.tx_errors;
  54                 stats->tx_errors        = vport_stats.rx_errors;
  55                 stats->rx_dropped       = vport_stats.tx_dropped;
  56                 stats->tx_dropped       = vport_stats.rx_dropped;
  57                 stats->collisions       = vport_stats.collisions;
  58         }
  59
  60         return stats;
  61 }
  62
  63 static int internal_dev_mac_addr(struct net_device *dev, void *p)
  64 {
  65         struct sockaddr *addr = p;
  66
  67         if (!is_valid_ether_addr(addr->sa_data))
  68                 return -EADDRNOTAVAIL;
  69         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  70         return 0;
  71 }
  72
  73 /* Called with rcu_read_lock and bottom-halves disabled. */
  74 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  75 {
  76         compute_ip_summed(skb, true);
  77         vlan_copy_skb_tci(skb);
  78         OVS_CB(skb)->flow = NULL;
  79
  80         vport_receive(internal_dev_priv(netdev)->vport, skb);
  81         return 0;
  82 }
  83
  84 static int internal_dev_open(struct net_device *netdev)
  85 {
  86         netif_start_queue(netdev);
  87         return 0;
  88 }
  89
  90 static int internal_dev_stop(struct net_device *netdev)
  91 {
  92         netif_stop_queue(netdev);
  93         return 0;
  94 }
  95
  96 static void internal_dev_getinfo(struct net_device *netdev,
  97                                  struct ethtool_drvinfo *info)
  98 {
  99         strcpy(info->driver, "openvswitch");
 100 }
 101
 102 static const struct ethtool_ops internal_dev_ethtool_ops = {
 103         .get_drvinfo    = internal_dev_getinfo,
 104         .get_link       = ethtool_op_get_link,
 105         .get_sg         = ethtool_op_get_sg,
 106         .set_sg         = ethtool_op_set_sg,
 107         .get_tx_csum    = ethtool_op_get_tx_csum,
 108         .set_tx_csum    = ethtool_op_set_tx_hw_csum,
 109         .get_tso        = ethtool_op_get_tso,
 110         .set_tso        = ethtool_op_set_tso,
 111 };
 112
 113 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 114 {
 115         struct vport *vport = internal_dev_get_vport(netdev);
 116
 117         if (new_mtu < 68)
 118                 return -EINVAL;
 119
 120         if (new_mtu > dp_min_mtu(vport->dp))
 121                 return -EINVAL;
 122
 123         netdev->mtu = new_mtu;
 124         return 0;
 125 }
 126
 127 static int internal_dev_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 128 {
 129         if (dp_ioctl_hook)
 130                 return dp_ioctl_hook(dev, ifr, cmd);
 131
 132         return -EOPNOTSUPP;
 133 }
 134
 135 static void internal_dev_destructor(struct net_device *dev)
 136 {
 137         struct vport *vport = internal_dev_get_vport(dev);
 138
 139         vport_free(vport);
 140         free_netdev(dev);
 141 }
 142
 143 #ifdef HAVE_NET_DEVICE_OPS
 144 static const struct net_device_ops internal_dev_netdev_ops = {
 145         .ndo_open = internal_dev_open,
 146         .ndo_stop = internal_dev_stop,
 147         .ndo_start_xmit = internal_dev_xmit,
 148         .ndo_set_mac_address = internal_dev_mac_addr,
 149         .ndo_do_ioctl = internal_dev_do_ioctl,
 150         .ndo_change_mtu = internal_dev_change_mtu,
 151         .ndo_get_stats = internal_dev_sys_stats,
 152 };
 153 #endif
 154
 155 static void do_setup(struct net_device *netdev)
 156 {
 157         ether_setup(netdev);
 158
 159 #ifdef HAVE_NET_DEVICE_OPS
 160         netdev->netdev_ops = &internal_dev_netdev_ops;
 161 #else
 162         netdev->do_ioctl = internal_dev_do_ioctl;
 163         netdev->get_stats = internal_dev_sys_stats;
 164         netdev->hard_start_xmit = internal_dev_xmit;
 165         netdev->open = internal_dev_open;
 166         netdev->stop = internal_dev_stop;
 167         netdev->set_mac_address = internal_dev_mac_addr;
 168         netdev->change_mtu = internal_dev_change_mtu;
 169 #endif
 170
 171         netdev->destructor = internal_dev_destructor;
 172         SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
 173         netdev->tx_queue_len = 0;
 174
 175         netdev->flags = IFF_BROADCAST | IFF_MULTICAST;
 176         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 177                                 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
 178
 179         vport_gen_rand_ether_addr(netdev->dev_addr);
 180 }
 181
 182 static struct vport *internal_dev_create(const struct vport_parms *parms)
 183 {
 184         struct vport *vport;
 185         struct netdev_vport *netdev_vport;
 186         struct internal_dev *internal_dev;
 187         int err;
 188
 189         vport = vport_alloc(sizeof(struct netdev_vport), &internal_vport_ops, parms);
 190         if (IS_ERR(vport)) {
 191                 err = PTR_ERR(vport);
 192                 goto error;
 193         }
 194
 195         netdev_vport = netdev_vport_priv(vport);
 196
 197         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev), parms->name, do_setup);
 198         if (!netdev_vport->dev) {
 199                 err = -ENOMEM;
 200                 goto error_free_vport;
 201         }
 202
 203         internal_dev = internal_dev_priv(netdev_vport->dev);
 204         internal_dev->vport = vport;
 205
 206         err = register_netdevice(netdev_vport->dev);
 207         if (err)
 208                 goto error_free_netdev;
 209
 210         dev_set_promiscuity(netdev_vport->dev, 1);
 211         netif_start_queue(netdev_vport->dev);
 212
 213         return vport;
 214
 215 error_free_netdev:
 216         free_netdev(netdev_vport->dev);
 217 error_free_vport:
 218         vport_free(vport);
 219 error:
 220         return ERR_PTR(err);
 221 }
 222
 223 static int internal_dev_destroy(struct vport *vport)
 224 {
 225         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 226
 227         netif_stop_queue(netdev_vport->dev);
 228         dev_set_promiscuity(netdev_vport->dev, -1);
 229
 230         /* unregister_netdevice() waits for an RCU grace period. */
 231         unregister_netdevice(netdev_vport->dev);
 232
 233         return 0;
 234 }
 235
 236 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 237 {
 238         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 239         int len;
 240
 241 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
 242         if (unlikely(vlan_deaccel_tag(skb)))
 243                 return 0;
 244 #endif
 245
 246         len = skb->len;
 247         skb->dev = netdev;
 248         skb->pkt_type = PACKET_HOST;
 249         skb->protocol = eth_type_trans(skb, netdev);
 250
 251         if (in_interrupt())
 252                 netif_rx(skb);
 253         else
 254                 netif_rx_ni(skb);
 255
 256 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
 257         netdev->last_rx = jiffies;
 258 #endif
 259
 260         return len;
 261 }
 262
 263 const struct vport_ops internal_vport_ops = {
 264         .type           = ODP_VPORT_TYPE_INTERNAL,
 265         .flags          = VPORT_F_REQUIRED | VPORT_F_GEN_STATS | VPORT_F_FLOW,
 266         .create         = internal_dev_create,
 267         .destroy        = internal_dev_destroy,
 268         .set_mtu        = netdev_set_mtu,
 269         .set_addr       = netdev_set_addr,
 270         .get_name       = netdev_get_name,
 271         .get_addr       = netdev_get_addr,
 272         .get_kobj       = netdev_get_kobj,
 273         .get_dev_flags  = netdev_get_dev_flags,
 274         .is_running     = netdev_is_running,
 275         .get_operstate  = netdev_get_operstate,
 276         .get_ifindex    = netdev_get_ifindex,
 277         .get_iflink     = netdev_get_iflink,
 278         .get_mtu        = netdev_get_mtu,
 279         .send           = internal_dev_recv,
 280 };
 281
 282 int is_internal_dev(const struct net_device *netdev)
 283 {
 284 #ifdef HAVE_NET_DEVICE_OPS
 285         return netdev->netdev_ops == &internal_dev_netdev_ops;
 286 #else
 287         return netdev->open == internal_dev_open;
 288 #endif
 289 }
 290
 291 int is_internal_vport(const struct vport *vport)
 292 {
 293         return vport->ops == &internal_vport_ops;
 294 }
 295
 296 struct vport *internal_dev_get_vport(struct net_device *netdev)
 297 {
 298         if (!is_internal_dev(netdev))
 299                 return NULL;
 300
 301         return internal_dev_priv(netdev)->vport;
 302 }