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 #ifdef HAVE_NET_DEVICE_OPS
 136 static const struct net_device_ops internal_dev_netdev_ops = {
 137         .ndo_open = internal_dev_open,
 138         .ndo_stop = internal_dev_stop,
 139         .ndo_start_xmit = internal_dev_xmit,
 140         .ndo_set_mac_address = internal_dev_mac_addr,
 141         .ndo_do_ioctl = internal_dev_do_ioctl,
 142         .ndo_change_mtu = internal_dev_change_mtu,
 143         .ndo_get_stats = internal_dev_sys_stats,
 144 };
 145 #endif
 146
 147 static void do_setup(struct net_device *netdev)
 148 {
 149         ether_setup(netdev);
 150
 151 #ifdef HAVE_NET_DEVICE_OPS
 152         netdev->netdev_ops = &internal_dev_netdev_ops;
 153 #else
 154         netdev->do_ioctl = internal_dev_do_ioctl;
 155         netdev->get_stats = internal_dev_sys_stats;
 156         netdev->hard_start_xmit = internal_dev_xmit;
 157         netdev->open = internal_dev_open;
 158         netdev->stop = internal_dev_stop;
 159         netdev->set_mac_address = internal_dev_mac_addr;
 160         netdev->change_mtu = internal_dev_change_mtu;
 161 #endif
 162
 163         netdev->destructor = free_netdev;
 164         SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
 165         netdev->tx_queue_len = 0;
 166
 167         netdev->flags = IFF_BROADCAST | IFF_MULTICAST;
 168         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 169                                 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
 170
 171         vport_gen_rand_ether_addr(netdev->dev_addr);
 172 }
 173
 174 static struct vport *internal_dev_create(const struct vport_parms *parms)
 175 {
 176         struct vport *vport;
 177         struct netdev_vport *netdev_vport;
 178         struct internal_dev *internal_dev;
 179         int err;
 180
 181         vport = vport_alloc(sizeof(struct netdev_vport), &internal_vport_ops, parms);
 182         if (IS_ERR(vport)) {
 183                 err = PTR_ERR(vport);
 184                 goto error;
 185         }
 186
 187         netdev_vport = netdev_vport_priv(vport);
 188
 189         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev), parms->name, do_setup);
 190         if (!netdev_vport->dev) {
 191                 err = -ENOMEM;
 192                 goto error_free_vport;
 193         }
 194
 195         internal_dev = internal_dev_priv(netdev_vport->dev);
 196         internal_dev->vport = vport;
 197
 198         err = register_netdevice(netdev_vport->dev);
 199         if (err)
 200                 goto error_free_netdev;
 201
 202         dev_set_promiscuity(netdev_vport->dev, 1);
 203         netif_start_queue(netdev_vport->dev);
 204
 205         return vport;
 206
 207 error_free_netdev:
 208         free_netdev(netdev_vport->dev);
 209 error_free_vport:
 210         vport_free(vport);
 211 error:
 212         return ERR_PTR(err);
 213 }
 214
 215 static int internal_dev_destroy(struct vport *vport)
 216 {
 217         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 218
 219         netif_stop_queue(netdev_vport->dev);
 220         dev_set_promiscuity(netdev_vport->dev, -1);
 221
 222         unregister_netdevice(netdev_vport->dev);
 223         /* unregister_netdevice() waits for an RCU grace period. */
 224         vport_free(vport);
 225
 226         return 0;
 227 }
 228
 229 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 230 {
 231         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 232         int len;
 233
 234 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
 235         if (unlikely(vlan_deaccel_tag(skb)))
 236                 return 0;
 237 #endif
 238
 239         len = skb->len;
 240         skb->dev = netdev;
 241         skb->pkt_type = PACKET_HOST;
 242         skb->protocol = eth_type_trans(skb, netdev);
 243
 244         if (in_interrupt())
 245                 netif_rx(skb);
 246         else
 247                 netif_rx_ni(skb);
 248
 249 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
 250         netdev->last_rx = jiffies;
 251 #endif
 252
 253         return len;
 254 }
 255
 256 const struct vport_ops internal_vport_ops = {
 257         .type           = ODP_VPORT_TYPE_INTERNAL,
 258         .flags          = VPORT_F_REQUIRED | VPORT_F_GEN_STATS | VPORT_F_FLOW,
 259         .create         = internal_dev_create,
 260         .destroy        = internal_dev_destroy,
 261         .set_mtu        = netdev_set_mtu,
 262         .set_addr       = netdev_set_addr,
 263         .get_name       = netdev_get_name,
 264         .get_addr       = netdev_get_addr,
 265         .get_kobj       = netdev_get_kobj,
 266         .get_dev_flags  = netdev_get_dev_flags,
 267         .is_running     = netdev_is_running,
 268         .get_operstate  = netdev_get_operstate,
 269         .get_ifindex    = netdev_get_ifindex,
 270         .get_iflink     = netdev_get_iflink,
 271         .get_mtu        = netdev_get_mtu,
 272         .send           = internal_dev_recv,
 273 };
 274
 275 int is_internal_dev(const struct net_device *netdev)
 276 {
 277 #ifdef HAVE_NET_DEVICE_OPS
 278         return netdev->netdev_ops == &internal_dev_netdev_ops;
 279 #else
 280         return netdev->open == internal_dev_open;
 281 #endif
 282 }
 283
 284 int is_internal_vport(const struct vport *vport)
 285 {
 286         return vport->ops == &internal_vport_ops;
 287 }
 288
 289 struct vport *internal_dev_get_vport(struct net_device *netdev)
 290 {
 291         if (!is_internal_dev(netdev))
 292                 return NULL;
 293
 294         return internal_dev_priv(netdev)->vport;
 295 }