net/openvswitch/vport-internal_dev.c

   1 /*
   2  * Copyright (c) 2007-2012 Nicira, Inc.
   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
  27 #include <net/dst.h>
  28 #include <net/xfrm.h>
  29
  30 #include "datapath.h"
  31 #include "vport-internal_dev.h"
  32 #include "vport-netdev.h"
  33
  34 struct internal_dev {
  35         struct vport *vport;
  36 };
  37
  38 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
  39 {
  40         return netdev_priv(netdev);
  41 }
  42
  43 /* This function is only called by the kernel network layer.*/
  44 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
  45                                                         struct rtnl_link_stats64 *stats)
  46 {
  47         struct vport *vport = ovs_internal_dev_get_vport(netdev);
  48         struct ovs_vport_stats vport_stats;
  49
  50         ovs_vport_get_stats(vport, &vport_stats);
  51
  52         /* The tx and rx stats need to be swapped because the
  53          * switch and host OS have opposite perspectives. */
  54         stats->rx_packets       = vport_stats.tx_packets;
  55         stats->tx_packets       = vport_stats.rx_packets;
  56         stats->rx_bytes         = vport_stats.tx_bytes;
  57         stats->tx_bytes         = vport_stats.rx_bytes;
  58         stats->rx_errors        = vport_stats.tx_errors;
  59         stats->tx_errors        = vport_stats.rx_errors;
  60         stats->rx_dropped       = vport_stats.tx_dropped;
  61         stats->tx_dropped       = vport_stats.rx_dropped;
  62
  63         return stats;
  64 }
  65
  66 static int internal_dev_mac_addr(struct net_device *dev, void *p)
  67 {
  68         struct sockaddr *addr = p;
  69
  70         if (!is_valid_ether_addr(addr->sa_data))
  71                 return -EADDRNOTAVAIL;
  72         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  73         return 0;
  74 }
  75
  76 /* Called with rcu_read_lock_bh. */
  77 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  78 {
  79         rcu_read_lock();
  80         ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
  81         rcu_read_unlock();
  82         return 0;
  83 }
  84
  85 static int internal_dev_open(struct net_device *netdev)
  86 {
  87         netif_start_queue(netdev);
  88         return 0;
  89 }
  90
  91 static int internal_dev_stop(struct net_device *netdev)
  92 {
  93         netif_stop_queue(netdev);
  94         return 0;
  95 }
  96
  97 static void internal_dev_getinfo(struct net_device *netdev,
  98                                  struct ethtool_drvinfo *info)
  99 {
 100         strlcpy(info->driver, "openvswitch", sizeof(info->driver));
 101 }
 102
 103 static const struct ethtool_ops internal_dev_ethtool_ops = {
 104         .get_drvinfo    = internal_dev_getinfo,
 105         .get_link       = ethtool_op_get_link,
 106 };
 107
 108 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 109 {
 110         if (new_mtu < 68)
 111                 return -EINVAL;
 112
 113         netdev->mtu = new_mtu;
 114         return 0;
 115 }
 116
 117 static void internal_dev_destructor(struct net_device *dev)
 118 {
 119         struct vport *vport = ovs_internal_dev_get_vport(dev);
 120
 121         ovs_vport_free(vport);
 122         free_netdev(dev);
 123 }
 124
 125 static const struct net_device_ops internal_dev_netdev_ops = {
 126         .ndo_open = internal_dev_open,
 127         .ndo_stop = internal_dev_stop,
 128         .ndo_start_xmit = internal_dev_xmit,
 129         .ndo_set_mac_address = internal_dev_mac_addr,
 130         .ndo_change_mtu = internal_dev_change_mtu,
 131         .ndo_get_stats64 = internal_dev_get_stats,
 132 };
 133
 134 static void do_setup(struct net_device *netdev)
 135 {
 136         ether_setup(netdev);
 137
 138         netdev->netdev_ops = &internal_dev_netdev_ops;
 139
 140         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 141         netdev->destructor = internal_dev_destructor;
 142         SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
 143         netdev->tx_queue_len = 0;
 144
 145         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 146                            NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
 147
 148         netdev->vlan_features = netdev->features;
 149         netdev->features |= NETIF_F_HW_VLAN_TX;
 150         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 151         eth_hw_addr_random(netdev);
 152 }
 153
 154 static struct vport *internal_dev_create(const struct vport_parms *parms)
 155 {
 156         struct vport *vport;
 157         struct netdev_vport *netdev_vport;
 158         struct internal_dev *internal_dev;
 159         int err;
 160
 161         vport = ovs_vport_alloc(sizeof(struct netdev_vport),
 162                                 &ovs_internal_vport_ops, parms);
 163         if (IS_ERR(vport)) {
 164                 err = PTR_ERR(vport);
 165                 goto error;
 166         }
 167
 168         netdev_vport = netdev_vport_priv(vport);
 169
 170         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
 171                                          parms->name, do_setup);
 172         if (!netdev_vport->dev) {
 173                 err = -ENOMEM;
 174                 goto error_free_vport;
 175         }
 176
 177         dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
 178         internal_dev = internal_dev_priv(netdev_vport->dev);
 179         internal_dev->vport = vport;
 180
 181         /* Restrict bridge port to current netns. */
 182         if (vport->port_no == OVSP_LOCAL)
 183                 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
 184
 185         err = register_netdevice(netdev_vport->dev);
 186         if (err)
 187                 goto error_free_netdev;
 188
 189         dev_set_promiscuity(netdev_vport->dev, 1);
 190         netif_start_queue(netdev_vport->dev);
 191
 192         return vport;
 193
 194 error_free_netdev:
 195         free_netdev(netdev_vport->dev);
 196 error_free_vport:
 197         ovs_vport_free(vport);
 198 error:
 199         return ERR_PTR(err);
 200 }
 201
 202 static void internal_dev_destroy(struct vport *vport)
 203 {
 204         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 205
 206         netif_stop_queue(netdev_vport->dev);
 207         dev_set_promiscuity(netdev_vport->dev, -1);
 208
 209         /* unregister_netdevice() waits for an RCU grace period. */
 210         unregister_netdevice(netdev_vport->dev);
 211 }
 212
 213 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 214 {
 215         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 216         int len;
 217
 218         len = skb->len;
 219
 220         skb_dst_drop(skb);
 221         nf_reset(skb);
 222         secpath_reset(skb);
 223
 224         skb->dev = netdev;
 225         skb->pkt_type = PACKET_HOST;
 226         skb->protocol = eth_type_trans(skb, netdev);
 227
 228         netif_rx(skb);
 229
 230         return len;
 231 }
 232
 233 const struct vport_ops ovs_internal_vport_ops = {
 234         .type           = OVS_VPORT_TYPE_INTERNAL,
 235         .create         = internal_dev_create,
 236         .destroy        = internal_dev_destroy,
 237         .get_name       = ovs_netdev_get_name,
 238         .get_ifindex    = ovs_netdev_get_ifindex,
 239         .send           = internal_dev_recv,
 240 };
 241
 242 int ovs_is_internal_dev(const struct net_device *netdev)
 243 {
 244         return netdev->netdev_ops == &internal_dev_netdev_ops;
 245 }
 246
 247 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 248 {
 249         if (!ovs_is_internal_dev(netdev))
 250                 return NULL;
 251
 252         return internal_dev_priv(netdev)->vport;
 253 }