net/openvswitch/vport-internal_dev.c

   1 /*
   2  * Copyright (c) 2007-2011 Nicira Networks.
   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 "datapath.h"
  28 #include "vport-internal_dev.h"
  29 #include "vport-netdev.h"
  30
  31 struct internal_dev {
  32         struct vport *vport;
  33 };
  34
  35 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
  36 {
  37         return netdev_priv(netdev);
  38 }
  39
  40 /* This function is only called by the kernel network layer.*/
  41 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
  42                                                         struct rtnl_link_stats64 *stats)
  43 {
  44         struct vport *vport = ovs_internal_dev_get_vport(netdev);
  45         struct ovs_vport_stats vport_stats;
  46
  47         ovs_vport_get_stats(vport, &vport_stats);
  48
  49         /* The tx and rx stats need to be swapped because the
  50          * switch and host OS have opposite perspectives. */
  51         stats->rx_packets       = vport_stats.tx_packets;
  52         stats->tx_packets       = vport_stats.rx_packets;
  53         stats->rx_bytes         = vport_stats.tx_bytes;
  54         stats->tx_bytes         = vport_stats.rx_bytes;
  55         stats->rx_errors        = vport_stats.tx_errors;
  56         stats->tx_errors        = vport_stats.rx_errors;
  57         stats->rx_dropped       = vport_stats.tx_dropped;
  58         stats->tx_dropped       = vport_stats.rx_dropped;
  59
  60         return stats;
  61 }
  62
  63 static int internal_dev_mac_addr(struct net_device *dev, void *p)
  64 {
  65         struct sockaddr *addr = p;
  66
  67         if (!is_valid_ether_addr(addr->sa_data))
  68                 return -EADDRNOTAVAIL;
  69         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  70         return 0;
  71 }
  72
  73 /* Called with rcu_read_lock_bh. */
  74 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  75 {
  76         rcu_read_lock();
  77         ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
  78         rcu_read_unlock();
  79         return 0;
  80 }
  81
  82 static int internal_dev_open(struct net_device *netdev)
  83 {
  84         netif_start_queue(netdev);
  85         return 0;
  86 }
  87
  88 static int internal_dev_stop(struct net_device *netdev)
  89 {
  90         netif_stop_queue(netdev);
  91         return 0;
  92 }
  93
  94 static void internal_dev_getinfo(struct net_device *netdev,
  95                                  struct ethtool_drvinfo *info)
  96 {
  97         strcpy(info->driver, "openvswitch");
  98 }
  99
 100 static const struct ethtool_ops internal_dev_ethtool_ops = {
 101         .get_drvinfo    = internal_dev_getinfo,
 102         .get_link       = ethtool_op_get_link,
 103 };
 104
 105 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 106 {
 107         if (new_mtu < 68)
 108                 return -EINVAL;
 109
 110         netdev->mtu = new_mtu;
 111         return 0;
 112 }
 113
 114 static void internal_dev_destructor(struct net_device *dev)
 115 {
 116         struct vport *vport = ovs_internal_dev_get_vport(dev);
 117
 118         ovs_vport_free(vport);
 119         free_netdev(dev);
 120 }
 121
 122 static const struct net_device_ops internal_dev_netdev_ops = {
 123         .ndo_open = internal_dev_open,
 124         .ndo_stop = internal_dev_stop,
 125         .ndo_start_xmit = internal_dev_xmit,
 126         .ndo_set_mac_address = internal_dev_mac_addr,
 127         .ndo_change_mtu = internal_dev_change_mtu,
 128         .ndo_get_stats64 = internal_dev_get_stats,
 129 };
 130
 131 static void do_setup(struct net_device *netdev)
 132 {
 133         ether_setup(netdev);
 134
 135         netdev->netdev_ops = &internal_dev_netdev_ops;
 136
 137         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 138         netdev->destructor = internal_dev_destructor;
 139         SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
 140         netdev->tx_queue_len = 0;
 141
 142         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 143                                 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
 144
 145         netdev->vlan_features = netdev->features;
 146         netdev->features |= NETIF_F_HW_VLAN_TX;
 147         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 148         random_ether_addr(netdev->dev_addr);
 149 }
 150
 151 static struct vport *internal_dev_create(const struct vport_parms *parms)
 152 {
 153         struct vport *vport;
 154         struct netdev_vport *netdev_vport;
 155         struct internal_dev *internal_dev;
 156         int err;
 157
 158         vport = ovs_vport_alloc(sizeof(struct netdev_vport),
 159                                 &ovs_internal_vport_ops, parms);
 160         if (IS_ERR(vport)) {
 161                 err = PTR_ERR(vport);
 162                 goto error;
 163         }
 164
 165         netdev_vport = netdev_vport_priv(vport);
 166
 167         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
 168                                          parms->name, do_setup);
 169         if (!netdev_vport->dev) {
 170                 err = -ENOMEM;
 171                 goto error_free_vport;
 172         }
 173
 174         internal_dev = internal_dev_priv(netdev_vport->dev);
 175         internal_dev->vport = vport;
 176
 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         netif_start_queue(netdev_vport->dev);
 183
 184         return vport;
 185
 186 error_free_netdev:
 187         free_netdev(netdev_vport->dev);
 188 error_free_vport:
 189         ovs_vport_free(vport);
 190 error:
 191         return ERR_PTR(err);
 192 }
 193
 194 static void internal_dev_destroy(struct vport *vport)
 195 {
 196         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 197
 198         netif_stop_queue(netdev_vport->dev);
 199         dev_set_promiscuity(netdev_vport->dev, -1);
 200
 201         /* unregister_netdevice() waits for an RCU grace period. */
 202         unregister_netdevice(netdev_vport->dev);
 203 }
 204
 205 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 206 {
 207         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 208         int len;
 209
 210         len = skb->len;
 211         skb->dev = netdev;
 212         skb->pkt_type = PACKET_HOST;
 213         skb->protocol = eth_type_trans(skb, netdev);
 214
 215         netif_rx(skb);
 216
 217         return len;
 218 }
 219
 220 const struct vport_ops ovs_internal_vport_ops = {
 221         .type           = OVS_VPORT_TYPE_INTERNAL,
 222         .create         = internal_dev_create,
 223         .destroy        = internal_dev_destroy,
 224         .get_name       = ovs_netdev_get_name,
 225         .get_ifindex    = ovs_netdev_get_ifindex,
 226         .send           = internal_dev_recv,
 227 };
 228
 229 int ovs_is_internal_dev(const struct net_device *netdev)
 230 {
 231         return netdev->netdev_ops == &internal_dev_netdev_ops;
 232 }
 233
 234 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 235 {
 236         if (!ovs_is_internal_dev(netdev))
 237                 return NULL;
 238
 239         return internal_dev_priv(netdev)->vport;
 240 }