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 const struct net_device_ops internal_dev_netdev_ops = {
 110         .ndo_open = internal_dev_open,
 111         .ndo_stop = internal_dev_stop,
 112         .ndo_start_xmit = internal_dev_xmit,
 113         .ndo_set_mac_address = eth_mac_addr,
 114         .ndo_change_mtu = internal_dev_change_mtu,
 115 };
 116
 117 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
 118         .kind = "openvswitch",
 119 };
 120
 121 static void do_setup(struct net_device *netdev)
 122 {
 123         ether_setup(netdev);
 124
 125         netdev->netdev_ops = &internal_dev_netdev_ops;
 126
 127         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 128         netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH;
 129         netdev->destructor = internal_dev_destructor;
 130         netdev->ethtool_ops = &internal_dev_ethtool_ops;
 131         netdev->rtnl_link_ops = &internal_dev_link_ops;
 132         netdev->tx_queue_len = 0;
 133
 134         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 135                            NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
 136                            NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
 137
 138         netdev->vlan_features = netdev->features;
 139         netdev->hw_enc_features = netdev->features;
 140         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
 141         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 142
 143         eth_hw_addr_random(netdev);
 144 }
 145
 146 static struct vport *internal_dev_create(const struct vport_parms *parms)
 147 {
 148         struct vport *vport;
 149         struct internal_dev *internal_dev;
 150         int err;
 151
 152         vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
 153         if (IS_ERR(vport)) {
 154                 err = PTR_ERR(vport);
 155                 goto error;
 156         }
 157
 158         vport->dev = alloc_netdev(sizeof(struct internal_dev),
 159                                   parms->name, NET_NAME_UNKNOWN, do_setup);
 160         if (!vport->dev) {
 161                 err = -ENOMEM;
 162                 goto error_free_vport;
 163         }
 164
 165         dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
 166         internal_dev = internal_dev_priv(vport->dev);
 167         internal_dev->vport = vport;
 168
 169         /* Restrict bridge port to current netns. */
 170         if (vport->port_no == OVSP_LOCAL)
 171                 vport->dev->features |= NETIF_F_NETNS_LOCAL;
 172
 173         rtnl_lock();
 174         err = register_netdevice(vport->dev);
 175         if (err)
 176                 goto error_free_netdev;
 177
 178         dev_set_promiscuity(vport->dev, 1);
 179         rtnl_unlock();
 180         netif_start_queue(vport->dev);
 181
 182         return vport;
 183
 184 error_free_netdev:
 185         rtnl_unlock();
 186         free_netdev(vport->dev);
 187 error_free_vport:
 188         ovs_vport_free(vport);
 189 error:
 190         return ERR_PTR(err);
 191 }
 192
 193 static void internal_dev_destroy(struct vport *vport)
 194 {
 195         netif_stop_queue(vport->dev);
 196         rtnl_lock();
 197         dev_set_promiscuity(vport->dev, -1);
 198
 199         /* unregister_netdevice() waits for an RCU grace period. */
 200         unregister_netdevice(vport->dev);
 201
 202         rtnl_unlock();
 203 }
 204
 205 static void internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 206 {
 207         struct net_device *netdev = vport->dev;
 208         struct pcpu_sw_netstats *stats;
 209
 210         if (unlikely(!(netdev->flags & IFF_UP))) {
 211                 kfree_skb(skb);
 212                 netdev->stats.rx_dropped++;
 213                 return;
 214         }
 215
 216         skb_dst_drop(skb);
 217         nf_reset(skb);
 218         secpath_reset(skb);
 219
 220         skb->dev = netdev;
 221         skb->pkt_type = PACKET_HOST;
 222         skb->protocol = eth_type_trans(skb, netdev);
 223         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 224
 225         stats = this_cpu_ptr(netdev->tstats);
 226         u64_stats_update_begin(&stats->syncp);
 227         stats->rx_packets++;
 228         stats->rx_bytes += skb->len;
 229         u64_stats_update_end(&stats->syncp);
 230
 231         netif_rx(skb);
 232 }
 233
 234 static struct vport_ops ovs_internal_vport_ops = {
 235         .type           = OVS_VPORT_TYPE_INTERNAL,
 236         .create         = internal_dev_create,
 237         .destroy        = internal_dev_destroy,
 238         .send           = internal_dev_recv,
 239 };
 240
 241 int ovs_is_internal_dev(const struct net_device *netdev)
 242 {
 243         return netdev->netdev_ops == &internal_dev_netdev_ops;
 244 }
 245
 246 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 247 {
 248         if (!ovs_is_internal_dev(netdev))
 249                 return NULL;
 250
 251         return internal_dev_priv(netdev)->vport;
 252 }
 253
 254 int ovs_internal_dev_rtnl_link_register(void)
 255 {
 256         int err;
 257
 258         err = rtnl_link_register(&internal_dev_link_ops);
 259         if (err < 0)
 260                 return err;
 261
 262         err = ovs_vport_ops_register(&ovs_internal_vport_ops);
 263         if (err < 0)
 264                 rtnl_link_unregister(&internal_dev_link_ops);
 265
 266         return err;
 267 }
 268
 269 void ovs_internal_dev_rtnl_link_unregister(void)
 270 {
 271         ovs_vport_ops_unregister(&ovs_internal_vport_ops);
 272         rtnl_link_unregister(&internal_dev_link_ops);
 273 }