summaryrefslogtreecommitdiff
path: root/net/8021q/vlan_dev.c
blob: f247f5bff88ddb61d252951f57a965789e63f45d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
/* -*- linux-c -*-
 * INET		802.1Q VLAN
 *		Ethernet-type device handling.
 *
 * Authors:	Ben Greear <greearb@candelatech.com>
 *              Please send support related email to: netdev@vger.kernel.org
 *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
 *
 * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
 *                - reset skb->pkt_type on incoming packets when MAC was changed
 *                - see that changed MAC is saddr for outgoing packets
 *              Oct 20, 2001:  Ard van Breeman:
 *                - Fix MC-list, finally.
 *                - Flush MC-list on VLAN destroy.
 *
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <net/arp.h>

#include "vlan.h"
#include "vlanproc.h"
#include <linux/if_vlan.h>

/*
 *	Rebuild the Ethernet MAC header. This is called after an ARP
 *	(or in future other address resolution) has completed on this
 *	sk_buff. We now let ARP fill in the other fields.
 *
 *	This routine CANNOT use cached dst->neigh!
 *	Really, it is used only when dst->neigh is wrong.
 *
 * TODO:  This needs a checkup, I'm ignorant here. --BLG
 */
static int vlan_dev_rebuild_header(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);

	switch (veth->h_vlan_encapsulated_proto) {
#ifdef CONFIG_INET
	case htons(ETH_P_IP):

		/* TODO:  Confirm this will work with VLAN headers... */
		return arp_find(veth->h_dest, skb);
#endif
	default:
		pr_debug("%s: unable to resolve type %X addresses.\n",
			 dev->name, ntohs(veth->h_vlan_encapsulated_proto));

		memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
		break;
	}

	return 0;
}

static inline u16
vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
{
	struct vlan_priority_tci_mapping *mp;

	mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
	while (mp) {
		if (mp->priority == skb->priority) {
			return mp->vlan_qos; /* This should already be shifted
					      * to mask correctly with the
					      * VLAN's TCI */
		}
		mp = mp->next;
	}
	return 0;
}

/*
 *	Create the VLAN header for an arbitrary protocol layer
 *
 *	saddr=NULL	means use device source address
 *	daddr=NULL	means leave destination address (eg unresolved arp)
 *
 *  This is called when the SKB is moving down the stack towards the
 *  physical devices.
 */
static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				unsigned short type,
				const void *daddr, const void *saddr,
				unsigned int len)
{
	struct vlan_hdr *vhdr;
	unsigned int vhdrlen = 0;
	u16 vlan_tci = 0;
	int rc;

	if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
		vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);

		vlan_tci = vlan_dev_info(dev)->vlan_id;
		vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
		vhdr->h_vlan_TCI = htons(vlan_tci);

		/*
		 *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
		 *  put the length in here instead.
		 */
		if (type != ETH_P_802_3 && type != ETH_P_802_2)
			vhdr->h_vlan_encapsulated_proto = htons(type);
		else
			vhdr->h_vlan_encapsulated_proto = htons(len);

		skb->protocol = htons(ETH_P_8021Q);
		type = ETH_P_8021Q;
		vhdrlen = VLAN_HLEN;
	}

	/* Before delegating work to the lower layer, enter our MAC-address */
	if (saddr == NULL)
		saddr = dev->dev_addr;

	/* Now make the underlying real hard header */
	dev = vlan_dev_info(dev)->real_dev;
	rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
	if (rc > 0)
		rc += vhdrlen;
	return rc;
}

static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
					    struct net_device *dev)
{
	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
	unsigned int len;
	int ret;

	/* Handle non-VLAN frames if they are sent to us, for example by DHCP.
	 *
	 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
	 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
	 */
	if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
	    vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
		u16 vlan_tci;
		vlan_tci = vlan_dev_info(dev)->vlan_id;
		vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
		skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
	}

	skb_set_dev(skb, vlan_dev_info(dev)->real_dev);
	len = skb->len;
	ret = dev_queue_xmit(skb);

	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
		struct vlan_pcpu_stats *stats;

		stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats);
		u64_stats_update_begin(&stats->syncp);
		stats->tx_packets++;
		stats->tx_bytes += len;
		u64_stats_update_begin(&stats->syncp);
	} else {
		this_cpu_inc(vlan_dev_info(dev)->vlan_pcpu_stats->tx_dropped);
	}

	return ret;
}

static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
{
	/* TODO: gotta make sure the underlying layer can handle it,
	 * maybe an IFF_VLAN_CAPABLE flag for devices?
	 */
	if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
		return -ERANGE;

	dev->mtu = new_mtu;

	return 0;
}

void vlan_dev_set_ingress_priority(const struct net_device *dev,
				   u32 skb_prio, u16 vlan_prio)
{
	struct vlan_dev_info *vlan = vlan_dev_info(dev);

	if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
		vlan->nr_ingress_mappings--;
	else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
		vlan->nr_ingress_mappings++;

	vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
}

int vlan_dev_set_egress_priority(const struct net_device *dev,
				 u32 skb_prio, u16 vlan_prio)
{
	struct vlan_dev_info *vlan = vlan_dev_info(dev);
	struct vlan_priority_tci_mapping *mp = NULL;
	struct vlan_priority_tci_mapping *np;
	u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;

	/* See if a priority mapping exists.. */
	mp = vlan->egress_priority_map[skb_prio & 0xF];
	while (mp) {
		if (mp->priority == skb_prio) {
			if (mp->vlan_qos && !vlan_qos)
				vlan->nr_egress_mappings--;
			else if (!mp->vlan_qos && vlan_qos)
				vlan->nr_egress_mappings++;
			mp->vlan_qos = vlan_qos;
			return 0;
		}
		mp = mp->next;
	}

	/* Create a new mapping then. */
	mp = vlan->egress_priority_map[skb_prio & 0xF];
	np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
	if (!np)
		return -ENOBUFS;

	np->next = mp;
	np->priority = skb_prio;
	np->vlan_qos = vlan_qos;
	vlan->egress_priority_map[skb_prio & 0xF] = np;
	if (vlan_qos)
		vlan->nr_egress_mappings++;
	return 0;
}

/* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
{
	struct vlan_dev_info *vlan = vlan_dev_info(dev);
	u32 old_flags = vlan->flags;

	if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
		     VLAN_FLAG_LOOSE_BINDING))
		return -EINVAL;

	vlan->flags = (old_flags & ~mask) | (flags & mask);

	if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
		if (vlan->flags & VLAN_FLAG_GVRP)
			vlan_gvrp_request_join(dev);
		else
			vlan_gvrp_request_leave(dev);
	}
	return 0;
}

void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
{
	strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
}

static int vlan_dev_open(struct net_device *dev)
{
	struct vlan_dev_info *vlan = vlan_dev_info(dev);
	struct net_device *real_dev = vlan->real_dev;
	int err;

	if (!(real_dev->flags & IFF_UP) &&
	    !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
		return -ENETDOWN;

	if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
		err = dev_uc_add(real_dev, dev->dev_addr);
		if (err < 0)
			goto out;
	}

	if (dev->flags & IFF_ALLMULTI) {
		err = dev_set_allmulti(real_dev, 1);
		if (err < 0)
			goto del_unicast;
	}
	if (dev->flags & IFF_PROMISC) {
		err = dev_set_promiscuity(real_dev, 1);
		if (err < 0)
			goto clear_allmulti;
	}

	memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);

	if (vlan->flags & VLAN_FLAG_GVRP)
		vlan_gvrp_request_join(dev);

	if (netif_carrier_ok(real_dev))
		netif_carrier_on(dev);
	return 0;

clear_allmulti:
	if (dev->flags & IFF_ALLMULTI)
		dev_set_allmulti(real_dev, -1);
del_unicast:
	if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
		dev_uc_del(real_dev, dev->dev_addr);
out:
	netif_carrier_off(dev);
	return err;
}

static int vlan_dev_stop(struct net_device *dev)
{
	struct vlan_dev_info *vlan = vlan_dev_info(dev);
	struct net_device *real_dev = vlan->real_dev;

	dev_mc_unsync(real_dev, dev);
	dev_uc_unsync(real_dev, dev);
	if (dev->flags & IFF_ALLMULTI)
		dev_set_allmulti(real_dev, -1);
	if (dev->flags & IFF_PROMISC)
		dev_set_promiscuity(real_dev, -1);

	if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
		dev_uc_del(real_dev, dev->dev_addr);

	netif_carrier_off(dev);
	return 0;
}

static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
	struct sockaddr *addr = p;
	int err;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	if (!(dev->flags & IFF_UP))
		goto out;

	if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
		err = dev_uc_add(real_dev, addr->sa_data);
		if (err < 0)
			return err;
	}

	if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
		dev_uc_del(real_dev, dev->dev_addr);

out:
	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	return 0;
}

static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
	const struct net_device_ops *ops = real_dev->netdev_ops;
	struct ifreq ifrr;
	int err = -EOPNOTSUPP;

	strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
	ifrr.ifr_ifru = ifr->ifr_ifru;

	switch (cmd) {
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
		if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
			err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
		break;
	}

	if (!err)
		ifr->ifr_ifru = ifrr.ifr_ifru;

	return err;
}

static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
	const struct net_device_ops *ops = real_dev->netdev_ops;
	int err = 0;

	if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
		err = ops->ndo_neigh_setup(real_dev, pa);

	return err;
}

#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
				   struct scatterlist *sgl, unsigned int sgc)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
	const struct net_device_ops *ops = real_dev->netdev_ops;
	int rc = 0;

	if (ops->ndo_fcoe_ddp_setup)
		rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);

	return rc;
}

static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
	const struct net_device_ops *ops = real_dev->netdev_ops;
	int len = 0;

	if (ops->ndo_fcoe_ddp_done)
		len = ops->ndo_fcoe_ddp_done(real_dev, xid);

	return len;
}

static int vlan_dev_fcoe_enable(struct net_device *dev)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
	const struct net_device_ops *ops = real_dev->netdev_ops;
	int rc = -EINVAL;

	if (ops->ndo_fcoe_enable)
		rc = ops->ndo_fcoe_enable(real_dev);
	return rc;
}

static int vlan_dev_fcoe_disable(struct net_device *dev)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
	const struct net_device_ops *ops = real_dev->netdev_ops;
	int rc = -EINVAL;

	if (ops->ndo_fcoe_disable)
		rc = ops->ndo_fcoe_disable(real_dev);
	return rc;
}

static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
	const struct net_device_ops *ops = real_dev->netdev_ops;
	int rc = -EINVAL;

	if (ops->ndo_fcoe_get_wwn)
		rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
	return rc;
}

static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
				    struct scatterlist *sgl, unsigned int sgc)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
	const struct net_device_ops *ops = real_dev->netdev_ops;
	int rc = 0;

	if (ops->ndo_fcoe_ddp_target)
		rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);

	return rc;
}
#endif

static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;

	if (change & IFF_ALLMULTI)
		dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
	if (change & IFF_PROMISC)
		dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
}

static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
{
	dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
	dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
}

/*
 * vlan network devices have devices nesting below it, and are a special
 * "super class" of normal network devices; split their locks off into a
 * separate class since they always nest.
 */
static struct lock_class_key vlan_netdev_xmit_lock_key;
static struct lock_class_key vlan_netdev_addr_lock_key;

static void vlan_dev_set_lockdep_one(struct net_device *dev,
				     struct netdev_queue *txq,
				     void *_subclass)
{
	lockdep_set_class_and_subclass(&txq->_xmit_lock,
				       &vlan_netdev_xmit_lock_key,
				       *(int *)_subclass);
}

static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
{
	lockdep_set_class_and_subclass(&dev->addr_list_lock,
				       &vlan_netdev_addr_lock_key,
				       subclass);
	netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
}

static const struct header_ops vlan_header_ops = {
	.create	 = vlan_dev_hard_header,
	.rebuild = vlan_dev_rebuild_header,
	.parse	 = eth_header_parse,
};

static const struct net_device_ops vlan_netdev_ops;

static int vlan_dev_init(struct net_device *dev)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
	int subclass = 0;

	netif_carrier_off(dev);

	/* IFF_BROADCAST|IFF_MULTICAST; ??? */
	dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
					  IFF_MASTER | IFF_SLAVE);
	dev->iflink = real_dev->ifindex;
	dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
					  (1<<__LINK_STATE_DORMANT))) |
		      (1<<__LINK_STATE_PRESENT);

	dev->hw_features = NETIF_F_ALL_TX_OFFLOADS;
	dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
	dev->gso_max_size = real_dev->gso_max_size;

	/* ipv6 shared card related stuff */
	dev->dev_id = real_dev->dev_id;

	if (is_zero_ether_addr(dev->dev_addr))
		memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
	if (is_zero_ether_addr(dev->broadcast))
		memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);

#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
	dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
#endif

	dev->needed_headroom = real_dev->needed_headroom;
	if (real_dev->features & NETIF_F_HW_VLAN_TX) {
		dev->header_ops      = real_dev->header_ops;
		dev->hard_header_len = real_dev->hard_header_len;
	} else {
		dev->header_ops      = &vlan_header_ops;
		dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
	}

	dev->netdev_ops = &vlan_netdev_ops;

	if (is_vlan_dev(real_dev))
		subclass = 1;

	vlan_dev_set_lockdep_class(dev, subclass);

	vlan_dev_info(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
	if (!vlan_dev_info(dev)->vlan_pcpu_stats)
		return -ENOMEM;

	return 0;
}

static void vlan_dev_uninit(struct net_device *dev)
{
	struct vlan_priority_tci_mapping *pm;
	struct vlan_dev_info *vlan = vlan_dev_info(dev);
	int i;

	free_percpu(vlan->vlan_pcpu_stats);
	vlan->vlan_pcpu_stats = NULL;
	for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
		while ((pm = vlan->egress_priority_map[i]) != NULL) {
			vlan->egress_priority_map[i] = pm->next;
			kfree(pm);
		}
	}
}

static u32 vlan_dev_fix_features(struct net_device *dev, u32 features)
{
	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;

	features &= real_dev->features;
	features &= real_dev->vlan_features;
	if (dev_ethtool_get_rx_csum(real_dev))
		features |= NETIF_F_RXCSUM;
	features |= NETIF_F_LLTX;

	return features;
}

static int vlan_ethtool_get_settings(struct net_device *dev,
				     struct ethtool_cmd *cmd)
{
	const struct vlan_dev_info *vlan = vlan_dev_info(dev);
	return dev_ethtool_get_settings(vlan->real_dev, cmd);
}

static void vlan_ethtool_get_drvinfo(struct net_device *dev,
				     struct ethtool_drvinfo *info)
{
	strcpy(info->driver, vlan_fullname);
	strcpy(info->version, vlan_version);
	strcpy(info->fw_version, "N/A");
}

static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
{

	if (vlan_dev_info(dev)->vlan_pcpu_stats) {
		struct vlan_pcpu_stats *p;
		u32 rx_errors = 0, tx_dropped = 0;
		int i;

		for_each_possible_cpu(i) {
			u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
			unsigned int start;

			p = per_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats, i);
			do {
				start = u64_stats_fetch_begin_bh(&p->syncp);
				rxpackets	= p->rx_packets;
				rxbytes		= p->rx_bytes;
				rxmulticast	= p->rx_multicast;
				txpackets	= p->tx_packets;
				txbytes		= p->tx_bytes;
			} while (u64_stats_fetch_retry_bh(&p->syncp, start));

			stats->rx_packets	+= rxpackets;
			stats->rx_bytes		+= rxbytes;
			stats->multicast	+= rxmulticast;
			stats->tx_packets	+= txpackets;
			stats->tx_bytes		+= txbytes;
			/* rx_errors & tx_dropped are u32 */
			rx_errors	+= p->rx_errors;
			tx_dropped	+= p->tx_dropped;
		}
		stats->rx_errors  = rx_errors;
		stats->tx_dropped = tx_dropped;
	}
	return stats;
}

static const struct ethtool_ops vlan_ethtool_ops = {
	.get_settings	        = vlan_ethtool_get_settings,
	.get_drvinfo	        = vlan_ethtool_get_drvinfo,
	.get_link		= ethtool_op_get_link,
};

static const struct net_device_ops vlan_netdev_ops = {
	.ndo_change_mtu		= vlan_dev_change_mtu,
	.ndo_init		= vlan_dev_init,
	.ndo_uninit		= vlan_dev_uninit,
	.ndo_open		= vlan_dev_open,
	.ndo_stop		= vlan_dev_stop,
	.ndo_start_xmit =  vlan_dev_hard_start_xmit,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= vlan_dev_set_mac_address,
	.ndo_set_rx_mode	= vlan_dev_set_rx_mode,
	.ndo_set_multicast_list	= vlan_dev_set_rx_mode,
	.ndo_change_rx_flags	= vlan_dev_change_rx_flags,
	.ndo_do_ioctl		= vlan_dev_ioctl,
	.ndo_neigh_setup	= vlan_dev_neigh_setup,
	.ndo_get_stats64	= vlan_dev_get_stats64,
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
	.ndo_fcoe_ddp_setup	= vlan_dev_fcoe_ddp_setup,
	.ndo_fcoe_ddp_done	= vlan_dev_fcoe_ddp_done,
	.ndo_fcoe_enable	= vlan_dev_fcoe_enable,
	.ndo_fcoe_disable	= vlan_dev_fcoe_disable,
	.ndo_fcoe_get_wwn	= vlan_dev_fcoe_get_wwn,
	.ndo_fcoe_ddp_target	= vlan_dev_fcoe_ddp_target,
#endif
	.ndo_fix_features	= vlan_dev_fix_features,
};

void vlan_setup(struct net_device *dev)
{
	ether_setup(dev);

	dev->priv_flags		|= IFF_802_1Q_VLAN;
	dev->priv_flags		&= ~IFF_XMIT_DST_RELEASE;
	dev->tx_queue_len	= 0;

	dev->netdev_ops		= &vlan_netdev_ops;
	dev->destructor		= free_netdev;
	dev->ethtool_ops	= &vlan_ethtool_ops;

	memset(dev->broadcast, 0, ETH_ALEN);
}