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 /* Called with rcu_read_lock_bh. */
  47 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  48 {
  49         int len, err;
  50
  51         len = skb->len;
  52         rcu_read_lock();
  53         err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
  54         rcu_read_unlock();
  55
  56         if (likely(!err)) {
  57                 struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
  58
  59                 u64_stats_update_begin(&tstats->syncp);
  60                 tstats->tx_bytes += len;
  61                 tstats->tx_packets++;
  62                 u64_stats_update_end(&tstats->syncp);
  63         } else {
  64                 netdev->stats.tx_errors++;
  65         }
  66         return 0;
  67 }
  68
  69 static int internal_dev_open(struct net_device *netdev)
  70 {
  71         netif_start_queue(netdev);
  72         return 0;
  73 }
  74
  75 static int internal_dev_stop(struct net_device *netdev)
  76 {
  77         netif_stop_queue(netdev);
  78         return 0;
  79 }
  80
  81 static void internal_dev_getinfo(struct net_device *netdev,
  82                                  struct ethtool_drvinfo *info)
  83 {
  84         strlcpy(info->driver, "openvswitch", sizeof(info->driver));
  85 }
  86
  87 static const struct ethtool_ops internal_dev_ethtool_ops = {
  88         .get_drvinfo    = internal_dev_getinfo,
  89         .get_link       = ethtool_op_get_link,
  90 };
  91
  92 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
  93 {
  94         if (new_mtu < 68)
  95                 return -EINVAL;
  96
  97         netdev->mtu = new_mtu;
  98         return 0;
  99 }
 100
 101 static void internal_dev_destructor(struct net_device *dev)
 102 {
 103         struct vport *vport = ovs_internal_dev_get_vport(dev);
 104
 105         ovs_vport_free(vport);
 106         free_netdev(dev);
 107 }
 108
 109 static struct rtnl_link_stats64 *
 110 internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
 111 {
 112         int i;
 113
 114         memset(stats, 0, sizeof(*stats));
 115         stats->rx_errors  = dev->stats.rx_errors;
 116         stats->tx_errors  = dev->stats.tx_errors;
 117         stats->tx_dropped = dev->stats.tx_dropped;
 118         stats->rx_dropped = dev->stats.rx_dropped;
 119
 120         for_each_possible_cpu(i) {
 121                 const struct pcpu_sw_netstats *percpu_stats;
 122                 struct pcpu_sw_netstats local_stats;
 123                 unsigned int start;
 124
 125                 percpu_stats = per_cpu_ptr(dev->tstats, i);
 126
 127                 do {
 128                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 129                         local_stats = *percpu_stats;
 130                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 131
 132                 stats->rx_bytes         += local_stats.rx_bytes;
 133                 stats->rx_packets       += local_stats.rx_packets;
 134                 stats->tx_bytes         += local_stats.tx_bytes;
 135                 stats->tx_packets       += local_stats.tx_packets;
 136         }
 137
 138         return stats;
 139 }
 140
 141 static void internal_set_rx_headroom(struct net_device *dev, int new_hr)
 142 {
 143         dev->needed_headroom = new_hr;
 144 }
 145
 146 static const struct net_device_ops internal_dev_netdev_ops = {
 147         .ndo_open = internal_dev_open,
 148         .ndo_stop = internal_dev_stop,
 149         .ndo_start_xmit = internal_dev_xmit,
 150         .ndo_set_mac_address = eth_mac_addr,
 151         .ndo_change_mtu = internal_dev_change_mtu,
 152         .ndo_get_stats64 = internal_get_stats,
 153         .ndo_set_rx_headroom = internal_set_rx_headroom,
 154 };
 155
 156 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
 157         .kind = "openvswitch",
 158 };
 159
 160 static void do_setup(struct net_device *netdev)
 161 {
 162         ether_setup(netdev);
 163
 164         netdev->netdev_ops = &internal_dev_netdev_ops;
 165
 166         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 167         netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
 168                               IFF_PHONY_HEADROOM;
 169         netdev->destructor = internal_dev_destructor;
 170         netdev->ethtool_ops = &internal_dev_ethtool_ops;
 171         netdev->rtnl_link_ops = &internal_dev_link_ops;
 172         netdev->tx_queue_len = 0;
 173
 174         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 175                            NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
 176                            NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
 177
 178         netdev->vlan_features = netdev->features;
 179         netdev->hw_enc_features = netdev->features;
 180         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
 181         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 182
 183         eth_hw_addr_random(netdev);
 184 }
 185
 186 static struct vport *internal_dev_create(const struct vport_parms *parms)
 187 {
 188         struct vport *vport;
 189         struct internal_dev *internal_dev;
 190         int err;
 191
 192         vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
 193         if (IS_ERR(vport)) {
 194                 err = PTR_ERR(vport);
 195                 goto error;
 196         }
 197
 198         vport->dev = alloc_netdev(sizeof(struct internal_dev),
 199                                   parms->name, NET_NAME_UNKNOWN, do_setup);
 200         if (!vport->dev) {
 201                 err = -ENOMEM;
 202                 goto error_free_vport;
 203         }
 204         vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 205         if (!vport->dev->tstats) {
 206                 err = -ENOMEM;
 207                 goto error_free_netdev;
 208         }
 209         vport->dev->needed_headroom = vport->dp->max_headroom;
 210
 211         dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
 212         internal_dev = internal_dev_priv(vport->dev);
 213         internal_dev->vport = vport;
 214
 215         /* Restrict bridge port to current netns. */
 216         if (vport->port_no == OVSP_LOCAL)
 217                 vport->dev->features |= NETIF_F_NETNS_LOCAL;
 218
 219         rtnl_lock();
 220         err = register_netdevice(vport->dev);
 221         if (err)
 222                 goto error_unlock;
 223
 224         dev_set_promiscuity(vport->dev, 1);
 225         rtnl_unlock();
 226         netif_start_queue(vport->dev);
 227
 228         return vport;
 229
 230 error_unlock:
 231         rtnl_unlock();
 232         free_percpu(vport->dev->tstats);
 233 error_free_netdev:
 234         free_netdev(vport->dev);
 235 error_free_vport:
 236         ovs_vport_free(vport);
 237 error:
 238         return ERR_PTR(err);
 239 }
 240
 241 static void internal_dev_destroy(struct vport *vport)
 242 {
 243         netif_stop_queue(vport->dev);
 244         rtnl_lock();
 245         dev_set_promiscuity(vport->dev, -1);
 246
 247         /* unregister_netdevice() waits for an RCU grace period. */
 248         unregister_netdevice(vport->dev);
 249         free_percpu(vport->dev->tstats);
 250         rtnl_unlock();
 251 }
 252
 253 static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
 254 {
 255         struct net_device *netdev = skb->dev;
 256         struct pcpu_sw_netstats *stats;
 257
 258         if (unlikely(!(netdev->flags & IFF_UP))) {
 259                 kfree_skb(skb);
 260                 netdev->stats.rx_dropped++;
 261                 return NETDEV_TX_OK;
 262         }
 263
 264         skb_dst_drop(skb);
 265         nf_reset(skb);
 266         secpath_reset(skb);
 267
 268         skb->pkt_type = PACKET_HOST;
 269         skb->protocol = eth_type_trans(skb, netdev);
 270         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 271
 272         stats = this_cpu_ptr(netdev->tstats);
 273         u64_stats_update_begin(&stats->syncp);
 274         stats->rx_packets++;
 275         stats->rx_bytes += skb->len;
 276         u64_stats_update_end(&stats->syncp);
 277
 278         netif_rx(skb);
 279         return NETDEV_TX_OK;
 280 }
 281
 282 static struct vport_ops ovs_internal_vport_ops = {
 283         .type           = OVS_VPORT_TYPE_INTERNAL,
 284         .create         = internal_dev_create,
 285         .destroy        = internal_dev_destroy,
 286         .send           = internal_dev_recv,
 287 };
 288
 289 int ovs_is_internal_dev(const struct net_device *netdev)
 290 {
 291         return netdev->netdev_ops == &internal_dev_netdev_ops;
 292 }
 293
 294 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 295 {
 296         if (!ovs_is_internal_dev(netdev))
 297                 return NULL;
 298
 299         return internal_dev_priv(netdev)->vport;
 300 }
 301
 302 int ovs_internal_dev_rtnl_link_register(void)
 303 {
 304         int err;
 305
 306         err = rtnl_link_register(&internal_dev_link_ops);
 307         if (err < 0)
 308                 return err;
 309
 310         err = ovs_vport_ops_register(&ovs_internal_vport_ops);
 311         if (err < 0)
 312                 rtnl_link_unregister(&internal_dev_link_ops);
 313
 314         return err;
 315 }
 316
 317 void ovs_internal_dev_rtnl_link_unregister(void)
 318 {
 319         ovs_vport_ops_unregister(&ovs_internal_vport_ops);
 320         rtnl_link_unregister(&internal_dev_link_ops);
 321 }