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 static int internal_dev_mac_addr(struct net_device *dev, void *p)
  67 {
  68         struct sockaddr *addr = p;
  69
  70         if (!is_valid_ether_addr(addr->sa_data))
  71                 return -EADDRNOTAVAIL;
  72         dev->addr_assign_type &= ~NET_ADDR_RANDOM;
  73         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  74         return 0;
  75 }
  76
  77 /* Called with rcu_read_lock_bh. */
  78 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  79 {
  80         rcu_read_lock();
  81         ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
  82         rcu_read_unlock();
  83         return 0;
  84 }
  85
  86 static int internal_dev_open(struct net_device *netdev)
  87 {
  88         netif_start_queue(netdev);
  89         return 0;
  90 }
  91
  92 static int internal_dev_stop(struct net_device *netdev)
  93 {
  94         netif_stop_queue(netdev);
  95         return 0;
  96 }
  97
  98 static void internal_dev_getinfo(struct net_device *netdev,
  99                                  struct ethtool_drvinfo *info)
 100 {
 101         strcpy(info->driver, "openvswitch");
 102 }
 103
 104 static const struct ethtool_ops internal_dev_ethtool_ops = {
 105         .get_drvinfo    = internal_dev_getinfo,
 106         .get_link       = ethtool_op_get_link,
 107 };
 108
 109 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 110 {
 111         if (new_mtu < 68)
 112                 return -EINVAL;
 113
 114         netdev->mtu = new_mtu;
 115         return 0;
 116 }
 117
 118 static void internal_dev_destructor(struct net_device *dev)
 119 {
 120         struct vport *vport = ovs_internal_dev_get_vport(dev);
 121
 122         ovs_vport_free(vport);
 123         free_netdev(dev);
 124 }
 125
 126 static const struct net_device_ops internal_dev_netdev_ops = {
 127         .ndo_open = internal_dev_open,
 128         .ndo_stop = internal_dev_stop,
 129         .ndo_start_xmit = internal_dev_xmit,
 130         .ndo_set_mac_address = internal_dev_mac_addr,
 131         .ndo_change_mtu = internal_dev_change_mtu,
 132         .ndo_get_stats64 = internal_dev_get_stats,
 133 };
 134
 135 static void do_setup(struct net_device *netdev)
 136 {
 137         ether_setup(netdev);
 138
 139         netdev->netdev_ops = &internal_dev_netdev_ops;
 140
 141         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 142         netdev->destructor = internal_dev_destructor;
 143         SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
 144         netdev->tx_queue_len = 0;
 145
 146         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 147                            NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
 148
 149         netdev->vlan_features = netdev->features;
 150         netdev->features |= NETIF_F_HW_VLAN_TX;
 151         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 152         eth_hw_addr_random(netdev);
 153 }
 154
 155 static struct vport *internal_dev_create(const struct vport_parms *parms)
 156 {
 157         struct vport *vport;
 158         struct netdev_vport *netdev_vport;
 159         struct internal_dev *internal_dev;
 160         int err;
 161
 162         vport = ovs_vport_alloc(sizeof(struct netdev_vport),
 163                                 &ovs_internal_vport_ops, parms);
 164         if (IS_ERR(vport)) {
 165                 err = PTR_ERR(vport);
 166                 goto error;
 167         }
 168
 169         netdev_vport = netdev_vport_priv(vport);
 170
 171         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
 172                                          parms->name, do_setup);
 173         if (!netdev_vport->dev) {
 174                 err = -ENOMEM;
 175                 goto error_free_vport;
 176         }
 177
 178         dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
 179         internal_dev = internal_dev_priv(netdev_vport->dev);
 180         internal_dev->vport = vport;
 181
 182         /* Restrict bridge port to current netns. */
 183         if (vport->port_no == OVSP_LOCAL)
 184                 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
 185
 186         err = register_netdevice(netdev_vport->dev);
 187         if (err)
 188                 goto error_free_netdev;
 189
 190         dev_set_promiscuity(netdev_vport->dev, 1);
 191         netif_start_queue(netdev_vport->dev);
 192
 193         return vport;
 194
 195 error_free_netdev:
 196         free_netdev(netdev_vport->dev);
 197 error_free_vport:
 198         ovs_vport_free(vport);
 199 error:
 200         return ERR_PTR(err);
 201 }
 202
 203 static void internal_dev_destroy(struct vport *vport)
 204 {
 205         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 206
 207         netif_stop_queue(netdev_vport->dev);
 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
 214 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 215 {
 216         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 217         int len;
 218
 219         len = skb->len;
 220
 221         skb_dst_drop(skb);
 222         nf_reset(skb);
 223         secpath_reset(skb);
 224
 225         skb->dev = netdev;
 226         skb->pkt_type = PACKET_HOST;
 227         skb->protocol = eth_type_trans(skb, netdev);
 228
 229         netif_rx(skb);
 230
 231         return len;
 232 }
 233
 234 const struct vport_ops ovs_internal_vport_ops = {
 235         .type           = OVS_VPORT_TYPE_INTERNAL,
 236         .create         = internal_dev_create,
 237         .destroy        = internal_dev_destroy,
 238         .get_name       = ovs_netdev_get_name,
 239         .get_ifindex    = ovs_netdev_get_ifindex,
 240         .send           = internal_dev_recv,
 241 };
 242
 243 int ovs_is_internal_dev(const struct net_device *netdev)
 244 {
 245         return netdev->netdev_ops == &internal_dev_netdev_ops;
 246 }
 247
 248 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 249 {
 250         if (!ovs_is_internal_dev(netdev))
 251                 return NULL;
 252
 253         return internal_dev_priv(netdev)->vport;
 254 }