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 | NETIF_F_GSO_SOFTWARE;
 144
 145         netdev->vlan_features = netdev->features;
 146         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
 147         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 148         eth_hw_addr_random(netdev);
 149 }
 150
 151 static struct vport *internal_dev_create(const struct vport_parms *parms)
 152 {
 153         struct vport *vport;
 154         struct netdev_vport *netdev_vport;
 155         struct internal_dev *internal_dev;
 156         int err;
 157
 158         vport = ovs_vport_alloc(sizeof(struct netdev_vport),
 159                                 &ovs_internal_vport_ops, parms);
 160         if (IS_ERR(vport)) {
 161                 err = PTR_ERR(vport);
 162                 goto error;
 163         }
 164
 165         netdev_vport = netdev_vport_priv(vport);
 166
 167         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
 168                                          parms->name, do_setup);
 169         if (!netdev_vport->dev) {
 170                 err = -ENOMEM;
 171                 goto error_free_vport;
 172         }
 173
 174         dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
 175         internal_dev = internal_dev_priv(netdev_vport->dev);
 176         internal_dev->vport = vport;
 177
 178         /* Restrict bridge port to current netns. */
 179         if (vport->port_no == OVSP_LOCAL)
 180                 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
 181
 182         rtnl_lock();
 183         err = register_netdevice(netdev_vport->dev);
 184         if (err)
 185                 goto error_free_netdev;
 186
 187         dev_set_promiscuity(netdev_vport->dev, 1);
 188         rtnl_unlock();
 189         netif_start_queue(netdev_vport->dev);
 190
 191         return vport;
 192
 193 error_free_netdev:
 194         rtnl_unlock();
 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         rtnl_lock();
 208         dev_set_promiscuity(netdev_vport->dev, -1);
 209
 210         /* unregister_netdevice() waits for an RCU grace period. */
 211         unregister_netdevice(netdev_vport->dev);
 212
 213         rtnl_unlock();
 214 }
 215
 216 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 217 {
 218         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 219         int len;
 220
 221         len = skb->len;
 222
 223         skb_dst_drop(skb);
 224         nf_reset(skb);
 225         secpath_reset(skb);
 226
 227         skb->dev = netdev;
 228         skb->pkt_type = PACKET_HOST;
 229         skb->protocol = eth_type_trans(skb, netdev);
 230         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 231
 232         netif_rx(skb);
 233
 234         return len;
 235 }
 236
 237 const struct vport_ops ovs_internal_vport_ops = {
 238         .type           = OVS_VPORT_TYPE_INTERNAL,
 239         .create         = internal_dev_create,
 240         .destroy        = internal_dev_destroy,
 241         .get_name       = ovs_netdev_get_name,
 242         .send           = internal_dev_recv,
 243 };
 244
 245 int ovs_is_internal_dev(const struct net_device *netdev)
 246 {
 247         return netdev->netdev_ops == &internal_dev_netdev_ops;
 248 }
 249
 250 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 251 {
 252         if (!ovs_is_internal_dev(netdev))
 253                 return NULL;
 254
 255         return internal_dev_priv(netdev)->vport;
 256 }
 257
 258 int ovs_internal_dev_rtnl_link_register(void)
 259 {
 260         return rtnl_link_register(&internal_dev_link_ops);
 261 }
 262
 263 void ovs_internal_dev_rtnl_link_unregister(void)
 264 {
 265         rtnl_link_unregister(&internal_dev_link_ops);
 266 }