linux/net/openvswitch/vport-internal_dev.c
<<
>>
Prefs
   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
  21struct internal_dev {
  22        struct vport *vport;
  23};
  24
  25static struct vport_ops ovs_internal_vport_ops;
  26
  27static 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. */
  33static netdev_tx_t
  34internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
  35{
  36        int len, err;
  37
  38        /* store len value because skb can be freed inside ovs_vport_receive() */
  39        len = skb->len;
  40
  41        rcu_read_lock();
  42        err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
  43        rcu_read_unlock();
  44
  45        if (likely(!err))
  46                dev_sw_netstats_tx_add(netdev, 1, len);
  47        else
  48                netdev->stats.tx_errors++;
  49
  50        return NETDEV_TX_OK;
  51}
  52
  53static int internal_dev_open(struct net_device *netdev)
  54{
  55        netif_start_queue(netdev);
  56        return 0;
  57}
  58
  59static int internal_dev_stop(struct net_device *netdev)
  60{
  61        netif_stop_queue(netdev);
  62        return 0;
  63}
  64
  65static void internal_dev_getinfo(struct net_device *netdev,
  66                                 struct ethtool_drvinfo *info)
  67{
  68        strlcpy(info->driver, "openvswitch", sizeof(info->driver));
  69}
  70
  71static const struct ethtool_ops internal_dev_ethtool_ops = {
  72        .get_drvinfo    = internal_dev_getinfo,
  73        .get_link       = ethtool_op_get_link,
  74};
  75
  76static void internal_dev_destructor(struct net_device *dev)
  77{
  78        struct vport *vport = ovs_internal_dev_get_vport(dev);
  79
  80        ovs_vport_free(vport);
  81}
  82
  83static const struct net_device_ops internal_dev_netdev_ops = {
  84        .ndo_open = internal_dev_open,
  85        .ndo_stop = internal_dev_stop,
  86        .ndo_start_xmit = internal_dev_xmit,
  87        .ndo_set_mac_address = eth_mac_addr,
  88        .ndo_get_stats64 = dev_get_tstats64,
  89};
  90
  91static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
  92        .kind = "openvswitch",
  93};
  94
  95static void do_setup(struct net_device *netdev)
  96{
  97        ether_setup(netdev);
  98
  99        netdev->max_mtu = ETH_MAX_MTU;
 100
 101        netdev->netdev_ops = &internal_dev_netdev_ops;
 102
 103        netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 104        netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
 105                              IFF_NO_QUEUE;
 106        netdev->needs_free_netdev = true;
 107        netdev->priv_destructor = NULL;
 108        netdev->ethtool_ops = &internal_dev_ethtool_ops;
 109        netdev->rtnl_link_ops = &internal_dev_link_ops;
 110
 111        netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
 112                           NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
 113                           NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
 114
 115        netdev->vlan_features = netdev->features;
 116        netdev->hw_enc_features = netdev->features;
 117        netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
 118        netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
 119
 120        eth_hw_addr_random(netdev);
 121}
 122
 123static struct vport *internal_dev_create(const struct vport_parms *parms)
 124{
 125        struct vport *vport;
 126        struct internal_dev *internal_dev;
 127        struct net_device *dev;
 128        int err;
 129
 130        vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
 131        if (IS_ERR(vport)) {
 132                err = PTR_ERR(vport);
 133                goto error;
 134        }
 135
 136        dev = alloc_netdev(sizeof(struct internal_dev),
 137                           parms->name, NET_NAME_USER, do_setup);
 138        vport->dev = dev;
 139        if (!vport->dev) {
 140                err = -ENOMEM;
 141                goto error_free_vport;
 142        }
 143        vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 144        if (!vport->dev->tstats) {
 145                err = -ENOMEM;
 146                goto error_free_netdev;
 147        }
 148
 149        dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
 150        internal_dev = internal_dev_priv(vport->dev);
 151        internal_dev->vport = vport;
 152
 153        /* Restrict bridge port to current netns. */
 154        if (vport->port_no == OVSP_LOCAL)
 155                vport->dev->features |= NETIF_F_NETNS_LOCAL;
 156
 157        rtnl_lock();
 158        err = register_netdevice(vport->dev);
 159        if (err)
 160                goto error_unlock;
 161        vport->dev->priv_destructor = internal_dev_destructor;
 162
 163        dev_set_promiscuity(vport->dev, 1);
 164        rtnl_unlock();
 165        netif_start_queue(vport->dev);
 166
 167        return vport;
 168
 169error_unlock:
 170        rtnl_unlock();
 171        free_percpu(dev->tstats);
 172error_free_netdev:
 173        free_netdev(dev);
 174error_free_vport:
 175        ovs_vport_free(vport);
 176error:
 177        return ERR_PTR(err);
 178}
 179
 180static void internal_dev_destroy(struct vport *vport)
 181{
 182        netif_stop_queue(vport->dev);
 183        rtnl_lock();
 184        dev_set_promiscuity(vport->dev, -1);
 185
 186        /* unregister_netdevice() waits for an RCU grace period. */
 187        unregister_netdevice(vport->dev);
 188        free_percpu(vport->dev->tstats);
 189        rtnl_unlock();
 190}
 191
 192static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
 193{
 194        struct net_device *netdev = skb->dev;
 195
 196        if (unlikely(!(netdev->flags & IFF_UP))) {
 197                kfree_skb(skb);
 198                netdev->stats.rx_dropped++;
 199                return NETDEV_TX_OK;
 200        }
 201
 202        skb_dst_drop(skb);
 203        nf_reset_ct(skb);
 204        secpath_reset(skb);
 205
 206        skb->pkt_type = PACKET_HOST;
 207        skb->protocol = eth_type_trans(skb, netdev);
 208        skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 209        dev_sw_netstats_rx_add(netdev, skb->len);
 210
 211        netif_rx(skb);
 212        return NETDEV_TX_OK;
 213}
 214
 215static struct vport_ops ovs_internal_vport_ops = {
 216        .type           = OVS_VPORT_TYPE_INTERNAL,
 217        .create         = internal_dev_create,
 218        .destroy        = internal_dev_destroy,
 219        .send           = internal_dev_recv,
 220};
 221
 222int ovs_is_internal_dev(const struct net_device *netdev)
 223{
 224        return netdev->netdev_ops == &internal_dev_netdev_ops;
 225}
 226
 227struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 228{
 229        if (!ovs_is_internal_dev(netdev))
 230                return NULL;
 231
 232        return internal_dev_priv(netdev)->vport;
 233}
 234
 235int ovs_internal_dev_rtnl_link_register(void)
 236{
 237        int err;
 238
 239        err = rtnl_link_register(&internal_dev_link_ops);
 240        if (err < 0)
 241                return err;
 242
 243        err = ovs_vport_ops_register(&ovs_internal_vport_ops);
 244        if (err < 0)
 245                rtnl_link_unregister(&internal_dev_link_ops);
 246
 247        return err;
 248}
 249
 250void ovs_internal_dev_rtnl_link_unregister(void)
 251{
 252        ovs_vport_ops_unregister(&ovs_internal_vport_ops);
 253        rtnl_link_unregister(&internal_dev_link_ops);
 254}
 255