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
  30 #include "datapath.h"
  31 #include "vport-internal_dev.h"
  32 #include "vport-netdev.h"
  33
  34 struct internal_dev {
  35         struct vport *vport;
  36 };
  37
  38 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
  39 {
  40         return netdev_priv(netdev);
  41 }
  42
  43 /* This function is only called by the kernel network layer.*/
  44 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
  45                                                         struct rtnl_link_stats64 *stats)
  46 {
  47         struct vport *vport = ovs_internal_dev_get_vport(netdev);
  48         struct ovs_vport_stats vport_stats;
  49
  50         ovs_vport_get_stats(vport, &vport_stats);
  51
  52         /* The tx and rx stats need to be swapped because the
  53          * switch and host OS have opposite perspectives. */
  54         stats->rx_packets       = vport_stats.tx_packets;
  55         stats->tx_packets       = vport_stats.rx_packets;
  56         stats->rx_bytes         = vport_stats.tx_bytes;
  57         stats->tx_bytes         = vport_stats.rx_bytes;
  58         stats->rx_errors        = vport_stats.tx_errors;
  59         stats->tx_errors        = vport_stats.rx_errors;
  60         stats->rx_dropped       = vport_stats.tx_dropped;
  61         stats->tx_dropped       = vport_stats.rx_dropped;
  62
  63         return stats;
  64 }
  65
  66 /* Called with rcu_read_lock_bh. */
  67 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  68 {
  69         rcu_read_lock();
  70         ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
  71         rcu_read_unlock();
  72         return 0;
  73 }
  74
  75 static int internal_dev_open(struct net_device *netdev)
  76 {
  77         netif_start_queue(netdev);
  78         return 0;
  79 }
  80
  81 static int internal_dev_stop(struct net_device *netdev)
  82 {
  83         netif_stop_queue(netdev);
  84         return 0;
  85 }
  86
  87 static void internal_dev_getinfo(struct net_device *netdev,
  88                                  struct ethtool_drvinfo *info)
  89 {
  90         strlcpy(info->driver, "openvswitch", sizeof(info->driver));
  91 }
  92
  93 static const struct ethtool_ops internal_dev_ethtool_ops = {
  94         .get_drvinfo    = internal_dev_getinfo,
  95         .get_link       = ethtool_op_get_link,
  96 };
  97
  98 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
  99 {
 100         if (new_mtu < 68)
 101                 return -EINVAL;
 102
 103         netdev->mtu = new_mtu;
 104         return 0;
 105 }
 106
 107 static void internal_dev_destructor(struct net_device *dev)
 108 {
 109         struct vport *vport = ovs_internal_dev_get_vport(dev);
 110
 111         ovs_vport_free(vport);
 112         free_netdev(dev);
 113 }
 114
 115 static const struct net_device_ops internal_dev_netdev_ops = {
 116         .ndo_open = internal_dev_open,
 117         .ndo_stop = internal_dev_stop,
 118         .ndo_start_xmit = internal_dev_xmit,
 119         .ndo_set_mac_address = eth_mac_addr,
 120         .ndo_change_mtu = internal_dev_change_mtu,
 121         .ndo_get_stats64 = internal_dev_get_stats,
 122 };
 123
 124 static void do_setup(struct net_device *netdev)
 125 {
 126         ether_setup(netdev);
 127
 128         netdev->netdev_ops = &internal_dev_netdev_ops;
 129
 130         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 131         netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
 132         netdev->destructor = internal_dev_destructor;
 133         netdev->ethtool_ops = &internal_dev_ethtool_ops;
 134         netdev->tx_queue_len = 0;
 135
 136         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 137                            NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE;
 138
 139         netdev->vlan_features = netdev->features;
 140         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
 141         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 142         eth_hw_addr_random(netdev);
 143 }
 144
 145 static struct vport *internal_dev_create(const struct vport_parms *parms)
 146 {
 147         struct vport *vport;
 148         struct netdev_vport *netdev_vport;
 149         struct internal_dev *internal_dev;
 150         int err;
 151
 152         vport = ovs_vport_alloc(sizeof(struct netdev_vport),
 153                                 &ovs_internal_vport_ops, parms);
 154         if (IS_ERR(vport)) {
 155                 err = PTR_ERR(vport);
 156                 goto error;
 157         }
 158
 159         netdev_vport = netdev_vport_priv(vport);
 160
 161         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
 162                                          parms->name, do_setup);
 163         if (!netdev_vport->dev) {
 164                 err = -ENOMEM;
 165                 goto error_free_vport;
 166         }
 167
 168         dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
 169         internal_dev = internal_dev_priv(netdev_vport->dev);
 170         internal_dev->vport = vport;
 171
 172         /* Restrict bridge port to current netns. */
 173         if (vport->port_no == OVSP_LOCAL)
 174                 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
 175
 176         rtnl_lock();
 177         err = register_netdevice(netdev_vport->dev);
 178         if (err)
 179                 goto error_free_netdev;
 180
 181         dev_set_promiscuity(netdev_vport->dev, 1);
 182         rtnl_unlock();
 183         netif_start_queue(netdev_vport->dev);
 184
 185         return vport;
 186
 187 error_free_netdev:
 188         rtnl_unlock();
 189         free_netdev(netdev_vport->dev);
 190 error_free_vport:
 191         ovs_vport_free(vport);
 192 error:
 193         return ERR_PTR(err);
 194 }
 195
 196 static void internal_dev_destroy(struct vport *vport)
 197 {
 198         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 199
 200         netif_stop_queue(netdev_vport->dev);
 201         rtnl_lock();
 202         dev_set_promiscuity(netdev_vport->dev, -1);
 203
 204         /* unregister_netdevice() waits for an RCU grace period. */
 205         unregister_netdevice(netdev_vport->dev);
 206
 207         rtnl_unlock();
 208 }
 209
 210 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 211 {
 212         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 213         int len;
 214
 215         len = skb->len;
 216
 217         skb_dst_drop(skb);
 218         nf_reset(skb);
 219         secpath_reset(skb);
 220
 221         skb->dev = netdev;
 222         skb->pkt_type = PACKET_HOST;
 223         skb->protocol = eth_type_trans(skb, netdev);
 224         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 225
 226         netif_rx(skb);
 227
 228         return len;
 229 }
 230
 231 const struct vport_ops ovs_internal_vport_ops = {
 232         .type           = OVS_VPORT_TYPE_INTERNAL,
 233         .create         = internal_dev_create,
 234         .destroy        = internal_dev_destroy,
 235         .get_name       = ovs_netdev_get_name,
 236         .send           = internal_dev_recv,
 237 };
 238
 239 int ovs_is_internal_dev(const struct net_device *netdev)
 240 {
 241         return netdev->netdev_ops == &internal_dev_netdev_ops;
 242 }
 243
 244 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 245 {
 246         if (!ovs_is_internal_dev(netdev))
 247                 return NULL;
 248
 249         return internal_dev_priv(netdev)->vport;
 250 }