net/openvswitch/vport-internal_dev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2012 Nicira, Inc.
   4  */
   5
   6 #include <linux/if_vlan.h>
   7 #include <linux/kernel.h>
   8 #include <linux/netdevice.h>
   9 #include <linux/etherdevice.h>
  10 #include <linux/ethtool.h>
  11 #include <linux/skbuff.h>
  12
  13 #include <net/dst.h>
  14 #include <net/xfrm.h>
  15 #include <net/rtnetlink.h>
  16
  17 #include "datapath.h"
  18 #include "vport-internal_dev.h"
  19 #include "vport-netdev.h"
  20
  21 struct internal_dev {
  22         struct vport *vport;
  23 };
  24
  25 static struct vport_ops ovs_internal_vport_ops;
  26
  27 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
  28 {
  29         return netdev_priv(netdev);
  30 }
  31
  32 /* Called with rcu_read_lock_bh. */
  33 static netdev_tx_t
  34 internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  35 {
  36         int len, err;
  37
  38         len = skb->len;
  39         rcu_read_lock();
  40         err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
  41         rcu_read_unlock();
  42
  43         if (likely(!err)) {
  44                 struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
  45
  46                 u64_stats_update_begin(&tstats->syncp);
  47                 tstats->tx_bytes += len;
  48                 tstats->tx_packets++;
  49                 u64_stats_update_end(&tstats->syncp);
  50         } else {
  51                 netdev->stats.tx_errors++;
  52         }
  53         return NETDEV_TX_OK;
  54 }
  55
  56 static int internal_dev_open(struct net_device *netdev)
  57 {
  58         netif_start_queue(netdev);
  59         return 0;
  60 }
  61
  62 static int internal_dev_stop(struct net_device *netdev)
  63 {
  64         netif_stop_queue(netdev);
  65         return 0;
  66 }
  67
  68 static void internal_dev_getinfo(struct net_device *netdev,
  69                                  struct ethtool_drvinfo *info)
  70 {
  71         strlcpy(info->driver, "openvswitch", sizeof(info->driver));
  72 }
  73
  74 static const struct ethtool_ops internal_dev_ethtool_ops = {
  75         .get_drvinfo    = internal_dev_getinfo,
  76         .get_link       = ethtool_op_get_link,
  77 };
  78
  79 static void internal_dev_destructor(struct net_device *dev)
  80 {
  81         struct vport *vport = ovs_internal_dev_get_vport(dev);
  82
  83         ovs_vport_free(vport);
  84 }
  85
  86 static void
  87 internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
  88 {
  89         int i;
  90
  91         memset(stats, 0, sizeof(*stats));
  92         stats->rx_errors  = dev->stats.rx_errors;
  93         stats->tx_errors  = dev->stats.tx_errors;
  94         stats->tx_dropped = dev->stats.tx_dropped;
  95         stats->rx_dropped = dev->stats.rx_dropped;
  96
  97         for_each_possible_cpu(i) {
  98                 const struct pcpu_sw_netstats *percpu_stats;
  99                 struct pcpu_sw_netstats local_stats;
 100                 unsigned int start;
 101
 102                 percpu_stats = per_cpu_ptr(dev->tstats, i);
 103
 104                 do {
 105                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 106                         local_stats = *percpu_stats;
 107                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 108
 109                 stats->rx_bytes         += local_stats.rx_bytes;
 110                 stats->rx_packets       += local_stats.rx_packets;
 111                 stats->tx_bytes         += local_stats.tx_bytes;
 112                 stats->tx_packets       += local_stats.tx_packets;
 113         }
 114 }
 115
 116 static const struct net_device_ops internal_dev_netdev_ops = {
 117         .ndo_open = internal_dev_open,
 118         .ndo_stop = internal_dev_stop,
 119         .ndo_start_xmit = internal_dev_xmit,
 120         .ndo_set_mac_address = eth_mac_addr,
 121         .ndo_get_stats64 = internal_get_stats,
 122 };
 123
 124 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
 125         .kind = "openvswitch",
 126 };
 127
 128 static void do_setup(struct net_device *netdev)
 129 {
 130         ether_setup(netdev);
 131
 132         netdev->max_mtu = ETH_MAX_MTU;
 133
 134         netdev->netdev_ops = &internal_dev_netdev_ops;
 135
 136         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 137         netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
 138                               IFF_NO_QUEUE;
 139         netdev->needs_free_netdev = true;
 140         netdev->priv_destructor = internal_dev_destructor;
 141         netdev->ethtool_ops = &internal_dev_ethtool_ops;
 142         netdev->rtnl_link_ops = &internal_dev_link_ops;
 143
 144         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 145                            NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
 146                            NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
 147
 148         netdev->vlan_features = netdev->features;
 149         netdev->hw_enc_features = netdev->features;
 150         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
 151         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 152
 153         eth_hw_addr_random(netdev);
 154 }
 155
 156 static struct vport *internal_dev_create(const struct vport_parms *parms)
 157 {
 158         struct vport *vport;
 159         struct internal_dev *internal_dev;
 160         struct net_device *dev;
 161         int err;
 162         bool free_vport = true;
 163
 164         vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
 165         if (IS_ERR(vport)) {
 166                 err = PTR_ERR(vport);
 167                 goto error;
 168         }
 169
 170         dev = alloc_netdev(sizeof(struct internal_dev),
 171                            parms->name, NET_NAME_USER, do_setup);
 172         vport->dev = dev;
 173         if (!vport->dev) {
 174                 err = -ENOMEM;
 175                 goto error_free_vport;
 176         }
 177         vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 178         if (!vport->dev->tstats) {
 179                 err = -ENOMEM;
 180                 goto error_free_netdev;
 181         }
 182
 183         dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
 184         internal_dev = internal_dev_priv(vport->dev);
 185         internal_dev->vport = vport;
 186
 187         /* Restrict bridge port to current netns. */
 188         if (vport->port_no == OVSP_LOCAL)
 189                 vport->dev->features |= NETIF_F_NETNS_LOCAL;
 190
 191         rtnl_lock();
 192         err = register_netdevice(vport->dev);
 193         if (err) {
 194                 free_vport = false;
 195                 goto error_unlock;
 196         }
 197
 198         dev_set_promiscuity(vport->dev, 1);
 199         rtnl_unlock();
 200         netif_start_queue(vport->dev);
 201
 202         return vport;
 203
 204 error_unlock:
 205         rtnl_unlock();
 206         free_percpu(dev->tstats);
 207 error_free_netdev:
 208         free_netdev(dev);
 209 error_free_vport:
 210         if (free_vport)
 211                 ovs_vport_free(vport);
 212 error:
 213         return ERR_PTR(err);
 214 }
 215
 216 static void internal_dev_destroy(struct vport *vport)
 217 {
 218         netif_stop_queue(vport->dev);
 219         rtnl_lock();
 220         dev_set_promiscuity(vport->dev, -1);
 221
 222         /* unregister_netdevice() waits for an RCU grace period. */
 223         unregister_netdevice(vport->dev);
 224         free_percpu(vport->dev->tstats);
 225         rtnl_unlock();
 226 }
 227
 228 static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
 229 {
 230         struct net_device *netdev = skb->dev;
 231         struct pcpu_sw_netstats *stats;
 232
 233         if (unlikely(!(netdev->flags & IFF_UP))) {
 234                 kfree_skb(skb);
 235                 netdev->stats.rx_dropped++;
 236                 return NETDEV_TX_OK;
 237         }
 238
 239         skb_dst_drop(skb);
 240         nf_reset_ct(skb);
 241         secpath_reset(skb);
 242
 243         skb->pkt_type = PACKET_HOST;
 244         skb->protocol = eth_type_trans(skb, netdev);
 245         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 246
 247         stats = this_cpu_ptr(netdev->tstats);
 248         u64_stats_update_begin(&stats->syncp);
 249         stats->rx_packets++;
 250         stats->rx_bytes += skb->len;
 251         u64_stats_update_end(&stats->syncp);
 252
 253         netif_rx(skb);
 254         return NETDEV_TX_OK;
 255 }
 256
 257 static struct vport_ops ovs_internal_vport_ops = {
 258         .type           = OVS_VPORT_TYPE_INTERNAL,
 259         .create         = internal_dev_create,
 260         .destroy        = internal_dev_destroy,
 261         .send           = internal_dev_recv,
 262 };
 263
 264 int ovs_is_internal_dev(const struct net_device *netdev)
 265 {
 266         return netdev->netdev_ops == &internal_dev_netdev_ops;
 267 }
 268
 269 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 270 {
 271         if (!ovs_is_internal_dev(netdev))
 272                 return NULL;
 273
 274         return internal_dev_priv(netdev)->vport;
 275 }
 276
 277 int ovs_internal_dev_rtnl_link_register(void)
 278 {
 279         int err;
 280
 281         err = rtnl_link_register(&internal_dev_link_ops);
 282         if (err < 0)
 283                 return err;
 284
 285         err = ovs_vport_ops_register(&ovs_internal_vport_ops);
 286         if (err < 0)
 287                 rtnl_link_unregister(&internal_dev_link_ops);
 288
 289         return err;
 290 }
 291
 292 void ovs_internal_dev_rtnl_link_unregister(void)
 293 {
 294         ovs_vport_ops_unregister(&ovs_internal_vport_ops);
 295         rtnl_link_unregister(&internal_dev_link_ops);
 296 }