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