4 * Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
6 * Author: Pavel Emelianov <xemul@openvz.org>
7 * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
11 #include <linux/list.h>
12 #include <linux/netdevice.h>
13 #include <linux/ethtool.h>
14 #include <linux/etherdevice.h>
18 #include <linux/veth.h>
20 #define DRV_NAME "veth"
21 #define DRV_VERSION "1.0"
23 struct veth_net_stats {
24 unsigned long rx_packets;
25 unsigned long tx_packets;
26 unsigned long rx_bytes;
27 unsigned long tx_bytes;
28 unsigned long tx_dropped;
32 struct net_device *peer;
33 struct list_head list;
34 struct veth_net_stats *stats;
38 static LIST_HEAD(veth_list);
45 const char string[ETH_GSTRING_LEN];
46 } ethtool_stats_keys[] = {
50 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
54 cmd->speed = SPEED_10000;
55 cmd->duplex = DUPLEX_FULL;
58 cmd->transceiver = XCVR_INTERNAL;
59 cmd->autoneg = AUTONEG_DISABLE;
65 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
67 strcpy(info->driver, DRV_NAME);
68 strcpy(info->version, DRV_VERSION);
69 strcpy(info->fw_version, "N/A");
72 static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
76 memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
81 static int veth_get_sset_count(struct net_device *dev, int sset)
85 return ARRAY_SIZE(ethtool_stats_keys);
91 static void veth_get_ethtool_stats(struct net_device *dev,
92 struct ethtool_stats *stats, u64 *data)
94 struct veth_priv *priv;
96 priv = netdev_priv(dev);
97 data[0] = priv->peer->ifindex;
100 static u32 veth_get_rx_csum(struct net_device *dev)
102 struct veth_priv *priv;
104 priv = netdev_priv(dev);
105 return priv->ip_summed == CHECKSUM_UNNECESSARY;
108 static int veth_set_rx_csum(struct net_device *dev, u32 data)
110 struct veth_priv *priv;
112 priv = netdev_priv(dev);
113 priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
117 static u32 veth_get_tx_csum(struct net_device *dev)
119 return (dev->features & NETIF_F_NO_CSUM) != 0;
122 static int veth_set_tx_csum(struct net_device *dev, u32 data)
125 dev->features |= NETIF_F_NO_CSUM;
127 dev->features &= ~NETIF_F_NO_CSUM;
131 static struct ethtool_ops veth_ethtool_ops = {
132 .get_settings = veth_get_settings,
133 .get_drvinfo = veth_get_drvinfo,
134 .get_link = ethtool_op_get_link,
135 .get_rx_csum = veth_get_rx_csum,
136 .set_rx_csum = veth_set_rx_csum,
137 .get_tx_csum = veth_get_tx_csum,
138 .set_tx_csum = veth_set_tx_csum,
139 .get_sg = ethtool_op_get_sg,
140 .set_sg = ethtool_op_set_sg,
141 .get_strings = veth_get_strings,
142 .get_sset_count = veth_get_sset_count,
143 .get_ethtool_stats = veth_get_ethtool_stats,
150 static int veth_xmit(struct sk_buff *skb, struct net_device *dev)
152 struct net_device *rcv = NULL;
153 struct veth_priv *priv, *rcv_priv;
154 struct veth_net_stats *stats;
159 priv = netdev_priv(dev);
161 rcv_priv = netdev_priv(rcv);
163 cpu = smp_processor_id();
164 stats = per_cpu_ptr(priv->stats, cpu);
166 if (!(rcv->flags & IFF_UP))
169 skb->pkt_type = PACKET_HOST;
170 skb->protocol = eth_type_trans(skb, rcv);
171 if (dev->features & NETIF_F_NO_CSUM)
172 skb->ip_summed = rcv_priv->ip_summed;
174 dst_release(skb->dst);
182 stats->tx_bytes += length;
185 stats = per_cpu_ptr(rcv_priv->stats, cpu);
186 stats->rx_bytes += length;
202 static struct net_device_stats *veth_get_stats(struct net_device *dev)
204 struct veth_priv *priv;
205 struct net_device_stats *dev_stats;
207 struct veth_net_stats *stats;
209 priv = netdev_priv(dev);
210 dev_stats = &dev->stats;
212 dev_stats->rx_packets = 0;
213 dev_stats->tx_packets = 0;
214 dev_stats->rx_bytes = 0;
215 dev_stats->tx_bytes = 0;
216 dev_stats->tx_dropped = 0;
218 for_each_online_cpu(cpu) {
219 stats = per_cpu_ptr(priv->stats, cpu);
221 dev_stats->rx_packets += stats->rx_packets;
222 dev_stats->tx_packets += stats->tx_packets;
223 dev_stats->rx_bytes += stats->rx_bytes;
224 dev_stats->tx_bytes += stats->tx_bytes;
225 dev_stats->tx_dropped += stats->tx_dropped;
231 static int veth_open(struct net_device *dev)
233 struct veth_priv *priv;
235 priv = netdev_priv(dev);
236 if (priv->peer == NULL)
239 if (priv->peer->flags & IFF_UP) {
240 netif_carrier_on(dev);
241 netif_carrier_on(priv->peer);
246 static int veth_dev_init(struct net_device *dev)
248 struct veth_net_stats *stats;
249 struct veth_priv *priv;
251 stats = alloc_percpu(struct veth_net_stats);
255 priv = netdev_priv(dev);
260 static void veth_dev_free(struct net_device *dev)
262 struct veth_priv *priv;
264 priv = netdev_priv(dev);
265 free_percpu(priv->stats);
269 static void veth_setup(struct net_device *dev)
273 dev->hard_start_xmit = veth_xmit;
274 dev->get_stats = veth_get_stats;
275 dev->open = veth_open;
276 dev->ethtool_ops = &veth_ethtool_ops;
277 dev->features |= NETIF_F_LLTX;
278 dev->init = veth_dev_init;
279 dev->destructor = veth_dev_free;
282 static void veth_change_state(struct net_device *dev)
284 struct net_device *peer;
285 struct veth_priv *priv;
287 priv = netdev_priv(dev);
290 if (netif_carrier_ok(peer)) {
291 if (!netif_carrier_ok(dev))
292 netif_carrier_on(dev);
294 if (netif_carrier_ok(dev))
295 netif_carrier_off(dev);
299 static int veth_device_event(struct notifier_block *unused,
300 unsigned long event, void *ptr)
302 struct net_device *dev = ptr;
304 if (dev->open != veth_open)
309 veth_change_state(dev);
316 static struct notifier_block veth_notifier_block __read_mostly = {
317 .notifier_call = veth_device_event,
324 static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
326 if (tb[IFLA_ADDRESS]) {
327 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
329 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
330 return -EADDRNOTAVAIL;
335 static struct rtnl_link_ops veth_link_ops;
337 static int veth_newlink(struct net_device *dev,
338 struct nlattr *tb[], struct nlattr *data[])
341 struct net_device *peer;
342 struct veth_priv *priv;
343 char ifname[IFNAMSIZ];
344 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
347 * create and register peer first
349 * struct ifinfomsg is at the head of VETH_INFO_PEER, but we
350 * skip it since no info from it is useful yet
353 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
354 struct nlattr *nla_peer;
356 nla_peer = data[VETH_INFO_PEER];
357 err = nla_parse(peer_tb, IFLA_MAX,
358 nla_data(nla_peer) + sizeof(struct ifinfomsg),
359 nla_len(nla_peer) - sizeof(struct ifinfomsg),
364 err = veth_validate(peer_tb, NULL);
372 if (tbp[IFLA_IFNAME])
373 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
375 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
377 peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp);
379 return PTR_ERR(peer);
381 if (tbp[IFLA_ADDRESS] == NULL)
382 random_ether_addr(peer->dev_addr);
384 err = register_netdevice(peer);
386 goto err_register_peer;
388 netif_carrier_off(peer);
393 * note, that since we've registered new device the dev's name
394 * should be re-allocated
397 if (tb[IFLA_ADDRESS] == NULL)
398 random_ether_addr(dev->dev_addr);
401 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
403 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
405 if (strchr(dev->name, '%')) {
406 err = dev_alloc_name(dev, dev->name);
411 err = register_netdevice(dev);
413 goto err_register_dev;
415 netif_carrier_off(dev);
418 * tie the deviced together
421 priv = netdev_priv(dev);
423 list_add(&priv->list, &veth_list);
425 priv = netdev_priv(peer);
427 INIT_LIST_HEAD(&priv->list);
433 unregister_netdevice(peer);
441 static void veth_dellink(struct net_device *dev)
443 struct veth_priv *priv;
444 struct net_device *peer;
446 priv = netdev_priv(dev);
449 if (!list_empty(&priv->list))
450 list_del(&priv->list);
452 priv = netdev_priv(peer);
453 if (!list_empty(&priv->list))
454 list_del(&priv->list);
456 unregister_netdevice(dev);
457 unregister_netdevice(peer);
460 static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
462 static struct rtnl_link_ops veth_link_ops = {
464 .priv_size = sizeof(struct veth_priv),
466 .validate = veth_validate,
467 .newlink = veth_newlink,
468 .dellink = veth_dellink,
469 .policy = veth_policy,
470 .maxtype = VETH_INFO_MAX,
477 static __init int veth_init(void)
479 register_netdevice_notifier(&veth_notifier_block);
480 return rtnl_link_register(&veth_link_ops);
483 static __exit void veth_exit(void)
485 rtnl_link_unregister(&veth_link_ops);
486 unregister_netdevice_notifier(&veth_notifier_block);
489 module_init(veth_init);
490 module_exit(veth_exit);
492 MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
493 MODULE_LICENSE("GPL v2");
494 MODULE_ALIAS_RTNL_LINK(DRV_NAME);