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