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 rtnl_link_stats64 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         compute_ip_summed(skb, true);
  77         OVS_CB(skb)->flow = NULL;
  78
  79         vport_receive(vport, skb);
  80         return 0;
  81 }
  82
  83 static int internal_dev_open(struct net_device *netdev)
  84 {
  85         netif_start_queue(netdev);
  86         return 0;
  87 }
  88
  89 static int internal_dev_stop(struct net_device *netdev)
  90 {
  91         netif_stop_queue(netdev);
  92         return 0;
  93 }
  94
  95 static void internal_dev_getinfo(struct net_device *netdev,
  96                                  struct ethtool_drvinfo *info)
  97 {
  98         struct vport *vport = internal_dev_get_vport(netdev);
  99         struct dp_port *dp_port;
 100
 101         strcpy(info->driver, "openvswitch");
 102
 103         if (!vport)
 104                 return;
 105
 106         dp_port = vport_get_dp_port(vport);
 107         if (dp_port)
 108                 sprintf(info->bus_info, "%d.%d", dp_port->dp->dp_idx, dp_port->port_no);
 109 }
 110
 111 static const struct ethtool_ops internal_dev_ethtool_ops = {
 112         .get_drvinfo    = internal_dev_getinfo,
 113         .get_link       = ethtool_op_get_link,
 114         .get_sg         = ethtool_op_get_sg,
 115         .set_sg         = ethtool_op_set_sg,
 116         .get_tx_csum    = ethtool_op_get_tx_csum,
 117         .set_tx_csum    = ethtool_op_set_tx_hw_csum,
 118         .get_tso        = ethtool_op_get_tso,
 119         .set_tso        = ethtool_op_set_tso,
 120 };
 121
 122 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 123 {
 124         struct vport *vport = internal_dev_get_vport(netdev);
 125
 126         if (new_mtu < 68)
 127                 return -EINVAL;
 128
 129         if (vport) {
 130                 struct dp_port *dp_port = vport_get_dp_port(vport);
 131
 132                 if (dp_port) {
 133                         if (new_mtu > dp_min_mtu(dp_port->dp))
 134                                 return -EINVAL;
 135                 }
 136         }
 137
 138         netdev->mtu = new_mtu;
 139         return 0;
 140 }
 141
 142 static int internal_dev_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 143 {
 144         if (dp_ioctl_hook)
 145                 return dp_ioctl_hook(dev, ifr, cmd);
 146
 147         return -EOPNOTSUPP;
 148 }
 149
 150 #ifdef HAVE_NET_DEVICE_OPS
 151 static const struct net_device_ops internal_dev_netdev_ops = {
 152         .ndo_open = internal_dev_open,
 153         .ndo_stop = internal_dev_stop,
 154         .ndo_start_xmit = internal_dev_xmit,
 155         .ndo_set_mac_address = internal_dev_mac_addr,
 156         .ndo_do_ioctl = internal_dev_do_ioctl,
 157         .ndo_change_mtu = internal_dev_change_mtu,
 158         .ndo_get_stats = internal_dev_sys_stats,
 159 };
 160 #endif
 161
 162 static void do_setup(struct net_device *netdev)
 163 {
 164         ether_setup(netdev);
 165
 166 #ifdef HAVE_NET_DEVICE_OPS
 167         netdev->netdev_ops = &internal_dev_netdev_ops;
 168 #else
 169         netdev->do_ioctl = internal_dev_do_ioctl;
 170         netdev->get_stats = internal_dev_sys_stats;
 171         netdev->hard_start_xmit = internal_dev_xmit;
 172         netdev->open = internal_dev_open;
 173         netdev->stop = internal_dev_stop;
 174         netdev->set_mac_address = internal_dev_mac_addr;
 175         netdev->change_mtu = internal_dev_change_mtu;
 176 #endif
 177
 178         netdev->destructor = free_netdev;
 179         SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
 180         netdev->tx_queue_len = 0;
 181
 182         netdev->flags = IFF_BROADCAST | IFF_MULTICAST;
 183         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_HIGHDMA
 184                                 | NETIF_F_HW_CSUM | NETIF_F_TSO;
 185
 186         vport_gen_rand_ether_addr(netdev->dev_addr);
 187 }
 188
 189 static struct vport *internal_dev_create(const char *name,
 190                                          const void __user *config)
 191 {
 192         struct vport *vport;
 193         struct netdev_vport *netdev_vport;
 194         struct internal_dev *internal_dev;
 195         int err;
 196
 197         vport = vport_alloc(sizeof(struct netdev_vport), &internal_vport_ops);
 198         if (IS_ERR(vport)) {
 199                 err = PTR_ERR(vport);
 200                 goto error;
 201         }
 202
 203         netdev_vport = netdev_vport_priv(vport);
 204
 205         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev), name, do_setup);
 206         if (!netdev_vport->dev) {
 207                 err = -ENOMEM;
 208                 goto error_free_vport;
 209         }
 210
 211         internal_dev = internal_dev_priv(netdev_vport->dev);
 212         rcu_assign_pointer(internal_dev->vport, vport);
 213
 214         err = register_netdevice(netdev_vport->dev);
 215         if (err)
 216                 goto error_free_netdev;
 217
 218         return vport;
 219
 220 error_free_netdev:
 221         free_netdev(netdev_vport->dev);
 222 error_free_vport:
 223         vport_free(vport);
 224 error:
 225         return ERR_PTR(err);
 226 }
 227
 228 static int internal_dev_destroy(struct vport *vport)
 229 {
 230         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 231
 232         unregister_netdevice(netdev_vport->dev);
 233         vport_free(vport);
 234
 235         return 0;
 236 }
 237
 238 static int internal_dev_attach(struct vport *vport)
 239 {
 240         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 241         struct internal_dev *internal_dev = internal_dev_priv(netdev_vport->dev);
 242
 243         rcu_assign_pointer(internal_dev->attached_vport, internal_dev->vport);
 244         dev_set_promiscuity(netdev_vport->dev, 1);
 245         netif_start_queue(netdev_vport->dev);
 246
 247         return 0;
 248 }
 249
 250 static int internal_dev_detach(struct vport *vport)
 251 {
 252         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 253         struct internal_dev *internal_dev = internal_dev_priv(netdev_vport->dev);
 254
 255         netif_stop_queue(netdev_vport->dev);
 256         dev_set_promiscuity(netdev_vport->dev, -1);
 257         rcu_assign_pointer(internal_dev->attached_vport, NULL);
 258
 259         return 0;
 260 }
 261
 262 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 263 {
 264         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 265         int len;
 266
 267         skb->dev = netdev;
 268         len = skb->len;
 269         skb->pkt_type = PACKET_HOST;
 270         skb->protocol = eth_type_trans(skb, netdev);
 271
 272         if (in_interrupt())
 273                 netif_rx(skb);
 274         else
 275                 netif_rx_ni(skb);
 276         netdev->last_rx = jiffies;
 277
 278         return len;
 279 }
 280
 281 const struct vport_ops internal_vport_ops = {
 282         .type           = "internal",
 283         .flags          = VPORT_F_REQUIRED | VPORT_F_GEN_STATS | VPORT_F_FLOW,
 284         .create         = internal_dev_create,
 285         .destroy        = internal_dev_destroy,
 286         .attach         = internal_dev_attach,
 287         .detach         = internal_dev_detach,
 288         .set_mtu        = netdev_set_mtu,
 289         .set_addr       = netdev_set_addr,
 290         .get_name       = netdev_get_name,
 291         .get_addr       = netdev_get_addr,
 292         .get_kobj       = netdev_get_kobj,
 293         .get_dev_flags  = netdev_get_dev_flags,
 294         .is_running     = netdev_is_running,
 295         .get_operstate  = netdev_get_operstate,
 296         .get_ifindex    = netdev_get_ifindex,
 297         .get_iflink     = netdev_get_iflink,
 298         .get_mtu        = netdev_get_mtu,
 299         .send           = internal_dev_recv,
 300 };
 301
 302 int is_internal_dev(const struct net_device *netdev)
 303 {
 304 #ifdef HAVE_NET_DEVICE_OPS
 305         return netdev->netdev_ops == &internal_dev_netdev_ops;
 306 #else
 307         return netdev->open == internal_dev_open;
 308 #endif
 309 }
 310
 311 int is_internal_vport(const struct vport *vport)
 312 {
 313         return vport->ops == &internal_vport_ops;
 314 }
 315
 316 struct vport *internal_dev_get_vport(struct net_device *netdev)
 317 {
 318         struct internal_dev *internal_dev;
 319
 320         if (!is_internal_dev(netdev))
 321                 return NULL;
 322
 323         internal_dev = internal_dev_priv(netdev);
 324         return rcu_dereference(internal_dev->attached_vport);
 325 }