datapath/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/netdev_features.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/version.h>
  28
  29 #include <net/dst.h>
  30 #include <net/xfrm.h>
  31
  32 #include "datapath.h"
  33 #include "vlan.h"
  34 #include "vport-internal_dev.h"
  35 #include "vport-netdev.h"
  36
  37 struct internal_dev {
  38         struct vport *vport;
  39 };
  40
  41 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
  42 {
  43         return netdev_priv(netdev);
  44 }
  45
  46 /* This function is only called by the kernel network layer.*/
  47 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
  48 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
  49                                                         struct rtnl_link_stats64 *stats)
  50 {
  51 #else
  52 static struct net_device_stats *internal_dev_sys_stats(struct net_device *netdev)
  53 {
  54         struct net_device_stats *stats = &netdev->stats;
  55 #endif
  56         struct vport *vport = ovs_internal_dev_get_vport(netdev);
  57         struct ovs_vport_stats vport_stats;
  58
  59         ovs_vport_get_stats(vport, &vport_stats);
  60
  61         /* The tx and rx stats need to be swapped because the
  62          * switch and host OS have opposite perspectives. */
  63         stats->rx_packets       = vport_stats.tx_packets;
  64         stats->tx_packets       = vport_stats.rx_packets;
  65         stats->rx_bytes         = vport_stats.tx_bytes;
  66         stats->tx_bytes         = vport_stats.rx_bytes;
  67         stats->rx_errors        = vport_stats.tx_errors;
  68         stats->tx_errors        = vport_stats.rx_errors;
  69         stats->rx_dropped       = vport_stats.tx_dropped;
  70         stats->tx_dropped       = vport_stats.rx_dropped;
  71
  72         return stats;
  73 }
  74
  75 /* Called with rcu_read_lock_bh. */
  76 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  77 {
  78         rcu_read_lock();
  79         ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
  80         rcu_read_unlock();
  81         return 0;
  82 }
  83
  84 static int internal_dev_open(struct net_device *netdev)
  85 {
  86         netif_start_queue(netdev);
  87         return 0;
  88 }
  89
  90 static int internal_dev_stop(struct net_device *netdev)
  91 {
  92         netif_stop_queue(netdev);
  93         return 0;
  94 }
  95
  96 static void internal_dev_getinfo(struct net_device *netdev,
  97                                  struct ethtool_drvinfo *info)
  98 {
  99         strlcpy(info->driver, "openvswitch", sizeof(info->driver));
 100 }
 101
 102 static const struct ethtool_ops internal_dev_ethtool_ops = {
 103         .get_drvinfo    = internal_dev_getinfo,
 104         .get_link       = ethtool_op_get_link,
 105 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
 106         .get_sg         = ethtool_op_get_sg,
 107         .set_sg         = ethtool_op_set_sg,
 108         .get_tx_csum    = ethtool_op_get_tx_csum,
 109         .set_tx_csum    = ethtool_op_set_tx_hw_csum,
 110         .get_tso        = ethtool_op_get_tso,
 111         .set_tso        = ethtool_op_set_tso,
 112 #endif
 113 };
 114
 115 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 116 {
 117         if (new_mtu < 68)
 118                 return -EINVAL;
 119
 120         netdev->mtu = new_mtu;
 121         return 0;
 122 }
 123
 124 static void internal_dev_destructor(struct net_device *dev)
 125 {
 126         struct vport *vport = ovs_internal_dev_get_vport(dev);
 127
 128         ovs_vport_free(vport);
 129         free_netdev(dev);
 130 }
 131
 132 static const struct net_device_ops internal_dev_netdev_ops = {
 133         .ndo_open = internal_dev_open,
 134         .ndo_stop = internal_dev_stop,
 135         .ndo_start_xmit = internal_dev_xmit,
 136         .ndo_set_mac_address = eth_mac_addr,
 137         .ndo_change_mtu = internal_dev_change_mtu,
 138 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
 139         .ndo_get_stats64 = internal_dev_get_stats,
 140 #else
 141         .ndo_get_stats = internal_dev_sys_stats,
 142 #endif
 143 };
 144
 145 static void do_setup(struct net_device *netdev)
 146 {
 147         ether_setup(netdev);
 148
 149         netdev->netdev_ops = &internal_dev_netdev_ops;
 150
 151         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 152         netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
 153         netdev->destructor = internal_dev_destructor;
 154         SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
 155         netdev->tx_queue_len = 0;
 156
 157         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 158                            NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
 159                            NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
 160
 161         netdev->vlan_features = netdev->features;
 162         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
 163
 164 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
 165         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 166 #endif
 167
 168 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
 169         netdev->hw_enc_features = netdev->features;
 170 #endif
 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 netdev_vport *netdev_vport;
 179         struct internal_dev *internal_dev;
 180         int err;
 181
 182         vport = ovs_vport_alloc(sizeof(struct netdev_vport),
 183                                 &ovs_internal_vport_ops, parms);
 184         if (IS_ERR(vport)) {
 185                 err = PTR_ERR(vport);
 186                 goto error;
 187         }
 188
 189         netdev_vport = netdev_vport_priv(vport);
 190
 191         netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
 192                                          parms->name, do_setup);
 193         if (!netdev_vport->dev) {
 194                 err = -ENOMEM;
 195                 goto error_free_vport;
 196         }
 197
 198         dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
 199         internal_dev = internal_dev_priv(netdev_vport->dev);
 200         internal_dev->vport = vport;
 201
 202         /* Restrict bridge port to current netns. */
 203         if (vport->port_no == OVSP_LOCAL)
 204                 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
 205
 206         rtnl_lock();
 207         err = register_netdevice(netdev_vport->dev);
 208         if (err)
 209                 goto error_free_netdev;
 210
 211         dev_set_promiscuity(netdev_vport->dev, 1);
 212         rtnl_unlock();
 213         netif_start_queue(netdev_vport->dev);
 214
 215         return vport;
 216
 217 error_free_netdev:
 218         rtnl_unlock();
 219         free_netdev(netdev_vport->dev);
 220 error_free_vport:
 221         ovs_vport_free(vport);
 222 error:
 223         return ERR_PTR(err);
 224 }
 225
 226 static void internal_dev_destroy(struct vport *vport)
 227 {
 228         struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 229
 230         netif_stop_queue(netdev_vport->dev);
 231         rtnl_lock();
 232         dev_set_promiscuity(netdev_vport->dev, -1);
 233
 234         /* unregister_netdevice() waits for an RCU grace period. */
 235         unregister_netdevice(netdev_vport->dev);
 236
 237         rtnl_unlock();
 238 }
 239
 240 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
 241 {
 242         struct net_device *netdev = netdev_vport_priv(vport)->dev;
 243         int len;
 244
 245 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
 246         if (vlan_tx_tag_present(skb)) {
 247                 if (unlikely(!__vlan_put_tag(skb,
 248                                              skb->vlan_proto,
 249                                              vlan_tx_tag_get(skb))))
 250                         return 0;
 251
 252                 if (skb->ip_summed == CHECKSUM_COMPLETE)
 253                         skb->csum = csum_add(skb->csum,
 254                                              csum_partial(skb->data + (2 * ETH_ALEN),
 255                                                           VLAN_HLEN, 0));
 256
 257                 vlan_set_tci(skb, 0);
 258         }
 259 #endif
 260
 261         len = skb->len;
 262
 263         skb_dst_drop(skb);
 264         nf_reset(skb);
 265         secpath_reset(skb);
 266
 267         skb->dev = netdev;
 268         skb->pkt_type = PACKET_HOST;
 269         skb->protocol = eth_type_trans(skb, netdev);
 270         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 271
 272         netif_rx(skb);
 273
 274         return len;
 275 }
 276
 277 const struct vport_ops ovs_internal_vport_ops = {
 278         .type           = OVS_VPORT_TYPE_INTERNAL,
 279         .create         = internal_dev_create,
 280         .destroy        = internal_dev_destroy,
 281         .get_name       = ovs_netdev_get_name,
 282         .send           = internal_dev_recv,
 283 };
 284
 285 int ovs_is_internal_dev(const struct net_device *netdev)
 286 {
 287         return netdev->netdev_ops == &internal_dev_netdev_ops;
 288 }
 289
 290 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 291 {
 292         if (!ovs_is_internal_dev(netdev))
 293                 return NULL;
 294
 295         return internal_dev_priv(netdev)->vport;
 296 }