datapath/vport-internal_dev.c

   1 /*
   2  * Copyright (c) 2009, 2010 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/kernel.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/ethtool.h>
  13 #include <linux/rcupdate.h>
  14 #include <linux/skbuff.h>
  15
  16 #include "datapath.h"
  17 #include "vport-generic.h"
  18 #include "vport-internal_dev.h"
  19 #include "vport-netdev.h"
  20
  21 struct internal_dev {
  22         struct vport *attached_vport, *vport;
  23         struct net_device_stats stats;
  24 };
  25
  26 static inline struct internal_dev *internal_dev_priv(struct net_device *netdev)
  27 {
  28         return netdev_priv(netdev);
  29 }
  30
  31 /* This function is only called by the kernel network layer.  It is not a vport
  32  * get_stats() function.  If a vport get_stats() function is defined that
  33  * results in this being called it will cause infinite recursion. */
  34 static struct net_device_stats *internal_dev_sys_stats(struct net_device *netdev)
  35 {
  36         struct vport *vport = internal_dev_get_vport(netdev);
  37         struct net_device_stats *stats = &internal_dev_priv(netdev)->stats;
  38
  39         if (vport) {
  40                 struct odp_vport_stats vport_stats;
  41
  42                 vport_get_stats(vport, &vport_stats);
  43
  44                 /* The tx and rx stats need to be swapped because the switch
  45                  * and host OS have opposite perspectives. */
  46                 stats->rx_packets       = vport_stats.tx_packets;
  47                 stats->tx_packets       = vport_stats.rx_packets;
  48                 stats->rx_bytes         = vport_stats.tx_bytes;
  49                 stats->tx_bytes         = vport_stats.rx_bytes;
  50                 stats->rx_errors        = vport_stats.tx_errors;
  51                 stats->tx_errors        = vport_stats.rx_errors;
  52                 stats->rx_dropped       = vport_stats.tx_dropped;
  53                 stats->tx_dropped       = vport_stats.rx_dropped;
  54                 stats->collisions       = vport_stats.collisions;
  55         }
  56
  57         return stats;
  58 }
  59
  60 static int internal_dev_mac_addr(struct net_device *dev, void *p)
  61 {
  62         struct sockaddr *addr = p;
  63
  64         if (!is_valid_ether_addr(addr->sa_data))
  65                 return -EADDRNOTAVAIL;
  66         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  67         return 0;
  68 }
  69
  70 /* Called with rcu_read_lock and bottom-halves disabled. */
  71 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  72 {
  73         struct internal_dev *internal_dev = internal_dev_priv(netdev);
  74         struct vport *vport = rcu_dereference(internal_dev->vport);
  75
  76         /* We need our own clone. */
  77         skb = skb_share_check(skb, GFP_ATOMIC);
  78         if (unlikely(!skb)) {
  79                 vport_record_error(vport, VPORT_E_RX_DROPPED);
  80                 return 0;
  81         }
  82
  83         skb_reset_mac_header(skb);
  84         compute_ip_summed(skb, true);
  85         OVS_CB(skb)->flow = NULL;
  86
  87         vport_receive(vport, skb);
  88
  89         return 0;
  90 }
  91
  92 static int internal_dev_open(struct net_device *netdev)
  93 {
  94         netif_start_queue(netdev);
  95         return 0;
  96 }
  97
  98 static int internal_dev_stop(struct net_device *netdev)
  99 {
 100         netif_stop_queue(netdev);
 101         return 0;
 102 }
 103
 104 static void internal_dev_getinfo(struct net_device *netdev,
 105                                  struct ethtool_drvinfo *info)
 106 {
 107         struct vport *vport = internal_dev_get_vport(netdev);
 108         struct dp_port *dp_port;
 109
 110         strcpy(info->driver, "openvswitch");
 111
 112         if (!vport)
 113                 return;
 114
 115         dp_port = vport_get_dp_port(vport);
 116         if (dp_port)
 117                 sprintf(info->bus_info, "%d.%d", dp_port->dp->dp_idx, dp_port->port_no);
 118 }
 119
 120 static struct ethtool_ops internal_dev_ethtool_ops = {
 121         .get_drvinfo    = internal_dev_getinfo,
 122         .get_link       = ethtool_op_get_link,
 123         .get_sg         = ethtool_op_get_sg,
 124         .set_sg         = ethtool_op_set_sg,
 125         .get_tx_csum    = ethtool_op_get_tx_csum,
 126         .set_tx_csum    = ethtool_op_set_tx_hw_csum,
 127         .get_tso        = ethtool_op_get_tso,
 128         .set_tso        = ethtool_op_set_tso,
 129 };
 130
 131 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 132 {
 133         struct vport *vport = internal_dev_get_vport(netdev);
 134
 135         if (new_mtu < 68)
 136                 return -EINVAL;
 137
 138         if (vport) {
 139                 struct dp_port *dp_port = vport_get_dp_port(vport);
 140
 141                 if (dp_port) {
 142                         if (new_mtu > dp_min_mtu(dp_port->dp))
 143                                 return -EINVAL;
 144                 }
 145         }
 146
 147         netdev->mtu = new_mtu;
 148         return 0;
 149 }
 150
 151 static int internal_dev_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 152 {
 153         if (dp_ioctl_hook)
 154                 return dp_ioctl_hook(dev, ifr, cmd);
 155
 156         return -EOPNOTSUPP;
 157 }
 158
 159 #ifdef HAVE_NET_DEVICE_OPS
 160 static const struct net_device_ops internal_dev_netdev_ops = {
 161         .ndo_open = internal_dev_open,
 162         .ndo_stop = internal_dev_stop,
 163         .ndo_start_xmit = internal_dev_xmit,
 164         .ndo_set_mac_address = internal_dev_mac_addr,
 165         .ndo_do_ioctl = internal_dev_do_ioctl,
 166         .ndo_change_mtu = internal_dev_change_mtu,
 167         .ndo_get_stats = internal_dev_sys_stats,
 168 };
 169 #endif
 170
 171 static void do_setup(struct net_device *netdev)
 172 {
 173         ether_setup(netdev);
 174
 175 #ifdef HAVE_NET_DEVICE_OPS
 176         netdev->netdev_ops = &internal_dev_netdev_ops;
 177 #else
 178         netdev->do_ioctl = internal_dev_do_ioctl;
 179         netdev->get_stats = internal_dev_sys_stats;
 180         netdev->hard_start_xmit = internal_dev_xmit;
 181         netdev->open = internal_dev_open;
 182         netdev->stop = internal_dev_stop;
 183         netdev->set_mac_address = internal_dev_mac_addr;
 184         netdev->change_mtu = internal_dev_change_mtu;
 185 #endif
 186
 187         netdev->destructor = free_netdev;
 188         SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
 189         netdev->tx_queue_len = 0;
 190
 191         netdev->flags = IFF_BROADCAST | IFF_MULTICAST;
 192         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_HIGHDMA
 193                                 | NETIF_F_HW_CSUM | NETIF_F_TSO;
 194
 195         vport_gen_rand_ether_addr(netdev->dev_addr);
 196 }
 197
 198 static struct vport *internal_dev_create(const char *name,
 199                                          const void __user *config)
 200 {
 201         struct vport *vport;
 202         struct netdev_vport *netdev_vport;
 203         struct internal_dev *internal_dev;
 204         int err;
 205
 206         vport = vport_alloc(sizeof(struct netdev_vport), &internal_vport_ops);
 207         if (IS_ERR(vport)) {
 208                 err = PTR_ERR(vport);
 209                 goto error;
 210         }
 211
 212         netdev_vport = netdev_vport_priv(vport);
 213
 214         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev), name, do_setup);
 215         if (!netdev_vport->dev) {
 216                 err = -ENOMEM;
 217                 goto error_free_vport;
 218         }
 219
 220         internal_dev = internal_dev_priv(netdev_vport->dev);
 221         rcu_assign_pointer(internal_dev->vport, vport);
 222
 223         err = register_netdevice(netdev_vport->dev);
 224         if (err)
 225                 goto error_free_netdev;
 226
 227         return vport;
 228
 229 error_free_netdev:
 230         free_netdev(netdev_vport->dev);
 231 error_free_vport:
 232         vport_free(vport);
 233 error:
 234         return ERR_PTR(err);
 235 }
 236
 237 static int internal_dev_destroy(struct vport *vport)
 238 {
 239         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 240
 241         unregister_netdevice(netdev_vport->dev);
 242         vport_free(vport);
 243
 244         return 0;
 245 }
 246
 247 static int internal_dev_attach(struct vport *vport)
 248 {
 249         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 250         struct internal_dev *internal_dev = internal_dev_priv(netdev_vport->dev);
 251
 252         rcu_assign_pointer(internal_dev->attached_vport, internal_dev->vport);
 253         dev_set_promiscuity(netdev_vport->dev, 1);
 254         netif_start_queue(netdev_vport->dev);
 255
 256         return 0;
 257 }
 258
 259 static int internal_dev_detach(struct vport *vport)
 260 {
 261         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 262         struct internal_dev *internal_dev = internal_dev_priv(netdev_vport->dev);
 263
 264         netif_stop_queue(netdev_vport->dev);
 265         dev_set_promiscuity(netdev_vport->dev, -1);
 266         rcu_assign_pointer(internal_dev->attached_vport, NULL);
 267
 268         return 0;
 269 }
 270
 271 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 272 {
 273         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 274         int len;
 275
 276         skb->dev = netdev;
 277         len = skb->len;
 278         skb->pkt_type = PACKET_HOST;
 279         skb->protocol = eth_type_trans(skb, netdev);
 280
 281         if (in_interrupt())
 282                 netif_rx(skb);
 283         else
 284                 netif_rx_ni(skb);
 285         netdev->last_rx = jiffies;
 286
 287         return len;
 288 }
 289
 290 struct vport_ops internal_vport_ops = {
 291         .type           = "internal",
 292         .flags          = VPORT_F_REQUIRED | VPORT_F_GEN_STATS | VPORT_F_FLOW,
 293         .create         = internal_dev_create,
 294         .destroy        = internal_dev_destroy,
 295         .attach         = internal_dev_attach,
 296         .detach         = internal_dev_detach,
 297         .set_mtu        = netdev_set_mtu,
 298         .set_addr       = netdev_set_addr,
 299         .get_name       = netdev_get_name,
 300         .get_addr       = netdev_get_addr,
 301         .get_kobj       = netdev_get_kobj,
 302         .get_dev_flags  = netdev_get_dev_flags,
 303         .is_running     = netdev_is_running,
 304         .get_operstate  = netdev_get_operstate,
 305         .get_ifindex    = netdev_get_ifindex,
 306         .get_iflink     = netdev_get_iflink,
 307         .get_mtu        = netdev_get_mtu,
 308         .send           = internal_dev_recv,
 309 };
 310
 311 int is_internal_dev(const struct net_device *netdev)
 312 {
 313 #ifdef HAVE_NET_DEVICE_OPS
 314         return netdev->netdev_ops == &internal_dev_netdev_ops;
 315 #else
 316         return netdev->open == internal_dev_open;
 317 #endif
 318 }
 319
 320 int is_internal_vport(const struct vport *vport)
 321 {
 322         return vport->ops == &internal_vport_ops;
 323 }
 324
 325 struct vport *internal_dev_get_vport(struct net_device *netdev)
 326 {
 327         struct internal_dev *internal_dev;
 328
 329         if (!is_internal_dev(netdev))
 330                 return NULL;
 331
 332         internal_dev = internal_dev_priv(netdev);
 333         return rcu_dereference(internal_dev->attached_vport);
 334 }