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 #include <net/rtnetlink.h>
  30
  31 #include "datapath.h"
  32 #include "vport-internal_dev.h"
  33 #include "vport-netdev.h"
  34
  35 struct internal_dev {
  36         struct vport *vport;
  37 };
  38
  39 static struct vport_ops ovs_internal_vport_ops;
  40
  41 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
  42 {
  43         return netdev_priv(netdev);
  44 }
  45
  46 /* This function is only called by the kernel network layer.*/
  47 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
  48                                                         struct rtnl_link_stats64 *stats)
  49 {
  50         struct vport *vport = ovs_internal_dev_get_vport(netdev);
  51         struct ovs_vport_stats vport_stats;
  52
  53         ovs_vport_get_stats(vport, &vport_stats);
  54
  55         /* The tx and rx stats need to be swapped because the
  56          * switch and host OS have opposite perspectives. */
  57         stats->rx_packets       = vport_stats.tx_packets;
  58         stats->tx_packets       = vport_stats.rx_packets;
  59         stats->rx_bytes         = vport_stats.tx_bytes;
  60         stats->tx_bytes         = vport_stats.rx_bytes;
  61         stats->rx_errors        = vport_stats.tx_errors;
  62         stats->tx_errors        = vport_stats.rx_errors;
  63         stats->rx_dropped       = vport_stats.tx_dropped;
  64         stats->tx_dropped       = vport_stats.rx_dropped;
  65
  66         return stats;
  67 }
  68
  69 /* Called with rcu_read_lock_bh. */
  70 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  71 {
  72         rcu_read_lock();
  73         ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
  74         rcu_read_unlock();
  75         return 0;
  76 }
  77
  78 static int internal_dev_open(struct net_device *netdev)
  79 {
  80         netif_start_queue(netdev);
  81         return 0;
  82 }
  83
  84 static int internal_dev_stop(struct net_device *netdev)
  85 {
  86         netif_stop_queue(netdev);
  87         return 0;
  88 }
  89
  90 static void internal_dev_getinfo(struct net_device *netdev,
  91                                  struct ethtool_drvinfo *info)
  92 {
  93         strlcpy(info->driver, "openvswitch", sizeof(info->driver));
  94 }
  95
  96 static const struct ethtool_ops internal_dev_ethtool_ops = {
  97         .get_drvinfo    = internal_dev_getinfo,
  98         .get_link       = ethtool_op_get_link,
  99 };
 100
 101 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 102 {
 103         if (new_mtu < 68)
 104                 return -EINVAL;
 105
 106         netdev->mtu = new_mtu;
 107         return 0;
 108 }
 109
 110 static void internal_dev_destructor(struct net_device *dev)
 111 {
 112         struct vport *vport = ovs_internal_dev_get_vport(dev);
 113
 114         ovs_vport_free(vport);
 115         free_netdev(dev);
 116 }
 117
 118 static const struct net_device_ops internal_dev_netdev_ops = {
 119         .ndo_open = internal_dev_open,
 120         .ndo_stop = internal_dev_stop,
 121         .ndo_start_xmit = internal_dev_xmit,
 122         .ndo_set_mac_address = eth_mac_addr,
 123         .ndo_change_mtu = internal_dev_change_mtu,
 124         .ndo_get_stats64 = internal_dev_get_stats,
 125 };
 126
 127 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
 128         .kind = "openvswitch",
 129 };
 130
 131 static void do_setup(struct net_device *netdev)
 132 {
 133         ether_setup(netdev);
 134
 135         netdev->netdev_ops = &internal_dev_netdev_ops;
 136
 137         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 138         netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
 139         netdev->destructor = internal_dev_destructor;
 140         netdev->ethtool_ops = &internal_dev_ethtool_ops;
 141         netdev->rtnl_link_ops = &internal_dev_link_ops;
 142         netdev->tx_queue_len = 0;
 143
 144         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 145                            NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
 146                            NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
 147
 148         netdev->vlan_features = netdev->features;
 149         netdev->hw_enc_features = netdev->features;
 150         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
 151         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 152
 153         eth_hw_addr_random(netdev);
 154 }
 155
 156 static struct vport *internal_dev_create(const struct vport_parms *parms)
 157 {
 158         struct vport *vport;
 159         struct netdev_vport *netdev_vport;
 160         struct internal_dev *internal_dev;
 161         int err;
 162
 163         vport = ovs_vport_alloc(sizeof(struct netdev_vport),
 164                                 &ovs_internal_vport_ops, parms);
 165         if (IS_ERR(vport)) {
 166                 err = PTR_ERR(vport);
 167                 goto error;
 168         }
 169
 170         netdev_vport = netdev_vport_priv(vport);
 171
 172         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
 173                                          parms->name, NET_NAME_UNKNOWN,
 174                                          do_setup);
 175         if (!netdev_vport->dev) {
 176                 err = -ENOMEM;
 177                 goto error_free_vport;
 178         }
 179
 180         dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
 181         internal_dev = internal_dev_priv(netdev_vport->dev);
 182         internal_dev->vport = vport;
 183
 184         /* Restrict bridge port to current netns. */
 185         if (vport->port_no == OVSP_LOCAL)
 186                 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
 187
 188         rtnl_lock();
 189         err = register_netdevice(netdev_vport->dev);
 190         if (err)
 191                 goto error_free_netdev;
 192
 193         dev_set_promiscuity(netdev_vport->dev, 1);
 194         rtnl_unlock();
 195         netif_start_queue(netdev_vport->dev);
 196
 197         return vport;
 198
 199 error_free_netdev:
 200         rtnl_unlock();
 201         free_netdev(netdev_vport->dev);
 202 error_free_vport:
 203         ovs_vport_free(vport);
 204 error:
 205         return ERR_PTR(err);
 206 }
 207
 208 static void internal_dev_destroy(struct vport *vport)
 209 {
 210         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 211
 212         netif_stop_queue(netdev_vport->dev);
 213         rtnl_lock();
 214         dev_set_promiscuity(netdev_vport->dev, -1);
 215
 216         /* unregister_netdevice() waits for an RCU grace period. */
 217         unregister_netdevice(netdev_vport->dev);
 218
 219         rtnl_unlock();
 220 }
 221
 222 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 223 {
 224         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 225         int len;
 226
 227         if (unlikely(!(netdev->flags & IFF_UP))) {
 228                 kfree_skb(skb);
 229                 return 0;
 230         }
 231
 232         len = skb->len;
 233
 234         skb_dst_drop(skb);
 235         nf_reset(skb);
 236         secpath_reset(skb);
 237
 238         skb->dev = netdev;
 239         skb->pkt_type = PACKET_HOST;
 240         skb->protocol = eth_type_trans(skb, netdev);
 241         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 242
 243         netif_rx(skb);
 244
 245         return len;
 246 }
 247
 248 static struct vport_ops ovs_internal_vport_ops = {
 249         .type           = OVS_VPORT_TYPE_INTERNAL,
 250         .create         = internal_dev_create,
 251         .destroy        = internal_dev_destroy,
 252         .get_name       = ovs_netdev_get_name,
 253         .send           = internal_dev_recv,
 254 };
 255
 256 int ovs_is_internal_dev(const struct net_device *netdev)
 257 {
 258         return netdev->netdev_ops == &internal_dev_netdev_ops;
 259 }
 260
 261 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 262 {
 263         if (!ovs_is_internal_dev(netdev))
 264                 return NULL;
 265
 266         return internal_dev_priv(netdev)->vport;
 267 }
 268
 269 int ovs_internal_dev_rtnl_link_register(void)
 270 {
 271         int err;
 272
 273         err = rtnl_link_register(&internal_dev_link_ops);
 274         if (err < 0)
 275                 return err;
 276
 277         err = ovs_vport_ops_register(&ovs_internal_vport_ops);
 278         if (err < 0)
 279                 rtnl_link_unregister(&internal_dev_link_ops);
 280
 281         return err;
 282 }
 283
 284 void ovs_internal_dev_rtnl_link_unregister(void)
 285 {
 286         ovs_vport_ops_unregister(&ovs_internal_vport_ops);
 287         rtnl_link_unregister(&internal_dev_link_ops);
 288 }