xref: /openbmc/linux/net/8021q/vlan_dev.c (revision b34e08d5)
1 /* -*- linux-c -*-
2  * INET		802.1Q VLAN
3  *		Ethernet-type device handling.
4  *
5  * Authors:	Ben Greear <greearb@candelatech.com>
6  *              Please send support related email to: netdev@vger.kernel.org
7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
8  *
9  * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
10  *                - reset skb->pkt_type on incoming packets when MAC was changed
11  *                - see that changed MAC is saddr for outgoing packets
12  *              Oct 20, 2001:  Ard van Breeman:
13  *                - Fix MC-list, finally.
14  *                - Flush MC-list on VLAN destroy.
15  *
16  *
17  *		This program is free software; you can redistribute it and/or
18  *		modify it under the terms of the GNU General Public License
19  *		as published by the Free Software Foundation; either version
20  *		2 of the License, or (at your option) any later version.
21  */
22 
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <linux/skbuff.h>
28 #include <linux/netdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/ethtool.h>
31 #include <net/arp.h>
32 
33 #include "vlan.h"
34 #include "vlanproc.h"
35 #include <linux/if_vlan.h>
36 #include <linux/netpoll.h>
37 
38 /*
39  *	Rebuild the Ethernet MAC header. This is called after an ARP
40  *	(or in future other address resolution) has completed on this
41  *	sk_buff. We now let ARP fill in the other fields.
42  *
43  *	This routine CANNOT use cached dst->neigh!
44  *	Really, it is used only when dst->neigh is wrong.
45  *
46  * TODO:  This needs a checkup, I'm ignorant here. --BLG
47  */
48 static int vlan_dev_rebuild_header(struct sk_buff *skb)
49 {
50 	struct net_device *dev = skb->dev;
51 	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
52 
53 	switch (veth->h_vlan_encapsulated_proto) {
54 #ifdef CONFIG_INET
55 	case htons(ETH_P_IP):
56 
57 		/* TODO:  Confirm this will work with VLAN headers... */
58 		return arp_find(veth->h_dest, skb);
59 #endif
60 	default:
61 		pr_debug("%s: unable to resolve type %X addresses\n",
62 			 dev->name, ntohs(veth->h_vlan_encapsulated_proto));
63 
64 		ether_addr_copy(veth->h_source, dev->dev_addr);
65 		break;
66 	}
67 
68 	return 0;
69 }
70 
71 /*
72  *	Create the VLAN header for an arbitrary protocol layer
73  *
74  *	saddr=NULL	means use device source address
75  *	daddr=NULL	means leave destination address (eg unresolved arp)
76  *
77  *  This is called when the SKB is moving down the stack towards the
78  *  physical devices.
79  */
80 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
81 				unsigned short type,
82 				const void *daddr, const void *saddr,
83 				unsigned int len)
84 {
85 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
86 	struct vlan_hdr *vhdr;
87 	unsigned int vhdrlen = 0;
88 	u16 vlan_tci = 0;
89 	int rc;
90 
91 	if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
92 		vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
93 
94 		vlan_tci = vlan->vlan_id;
95 		vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
96 		vhdr->h_vlan_TCI = htons(vlan_tci);
97 
98 		/*
99 		 *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
100 		 *  put the length in here instead.
101 		 */
102 		if (type != ETH_P_802_3 && type != ETH_P_802_2)
103 			vhdr->h_vlan_encapsulated_proto = htons(type);
104 		else
105 			vhdr->h_vlan_encapsulated_proto = htons(len);
106 
107 		skb->protocol = vlan->vlan_proto;
108 		type = ntohs(vlan->vlan_proto);
109 		vhdrlen = VLAN_HLEN;
110 	}
111 
112 	/* Before delegating work to the lower layer, enter our MAC-address */
113 	if (saddr == NULL)
114 		saddr = dev->dev_addr;
115 
116 	/* Now make the underlying real hard header */
117 	dev = vlan->real_dev;
118 	rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
119 	if (rc > 0)
120 		rc += vhdrlen;
121 	return rc;
122 }
123 
124 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
125 {
126 #ifdef CONFIG_NET_POLL_CONTROLLER
127 	if (vlan->netpoll)
128 		netpoll_send_skb(vlan->netpoll, skb);
129 #else
130 	BUG();
131 #endif
132 	return NETDEV_TX_OK;
133 }
134 
135 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
136 					    struct net_device *dev)
137 {
138 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
139 	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
140 	unsigned int len;
141 	int ret;
142 
143 	/* Handle non-VLAN frames if they are sent to us, for example by DHCP.
144 	 *
145 	 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
146 	 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
147 	 */
148 	if (veth->h_vlan_proto != vlan->vlan_proto ||
149 	    vlan->flags & VLAN_FLAG_REORDER_HDR) {
150 		u16 vlan_tci;
151 		vlan_tci = vlan->vlan_id;
152 		vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
153 		skb = __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
154 	}
155 
156 	skb->dev = vlan->real_dev;
157 	len = skb->len;
158 	if (unlikely(netpoll_tx_running(dev)))
159 		return vlan_netpoll_send_skb(vlan, skb);
160 
161 	ret = dev_queue_xmit(skb);
162 
163 	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
164 		struct vlan_pcpu_stats *stats;
165 
166 		stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
167 		u64_stats_update_begin(&stats->syncp);
168 		stats->tx_packets++;
169 		stats->tx_bytes += len;
170 		u64_stats_update_end(&stats->syncp);
171 	} else {
172 		this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
173 	}
174 
175 	return ret;
176 }
177 
178 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
179 {
180 	/* TODO: gotta make sure the underlying layer can handle it,
181 	 * maybe an IFF_VLAN_CAPABLE flag for devices?
182 	 */
183 	if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
184 		return -ERANGE;
185 
186 	dev->mtu = new_mtu;
187 
188 	return 0;
189 }
190 
191 void vlan_dev_set_ingress_priority(const struct net_device *dev,
192 				   u32 skb_prio, u16 vlan_prio)
193 {
194 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
195 
196 	if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
197 		vlan->nr_ingress_mappings--;
198 	else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
199 		vlan->nr_ingress_mappings++;
200 
201 	vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
202 }
203 
204 int vlan_dev_set_egress_priority(const struct net_device *dev,
205 				 u32 skb_prio, u16 vlan_prio)
206 {
207 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
208 	struct vlan_priority_tci_mapping *mp = NULL;
209 	struct vlan_priority_tci_mapping *np;
210 	u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
211 
212 	/* See if a priority mapping exists.. */
213 	mp = vlan->egress_priority_map[skb_prio & 0xF];
214 	while (mp) {
215 		if (mp->priority == skb_prio) {
216 			if (mp->vlan_qos && !vlan_qos)
217 				vlan->nr_egress_mappings--;
218 			else if (!mp->vlan_qos && vlan_qos)
219 				vlan->nr_egress_mappings++;
220 			mp->vlan_qos = vlan_qos;
221 			return 0;
222 		}
223 		mp = mp->next;
224 	}
225 
226 	/* Create a new mapping then. */
227 	mp = vlan->egress_priority_map[skb_prio & 0xF];
228 	np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
229 	if (!np)
230 		return -ENOBUFS;
231 
232 	np->next = mp;
233 	np->priority = skb_prio;
234 	np->vlan_qos = vlan_qos;
235 	/* Before inserting this element in hash table, make sure all its fields
236 	 * are committed to memory.
237 	 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
238 	 */
239 	smp_wmb();
240 	vlan->egress_priority_map[skb_prio & 0xF] = np;
241 	if (vlan_qos)
242 		vlan->nr_egress_mappings++;
243 	return 0;
244 }
245 
246 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
247 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
248 {
249 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
250 	u32 old_flags = vlan->flags;
251 
252 	if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
253 		     VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
254 		return -EINVAL;
255 
256 	vlan->flags = (old_flags & ~mask) | (flags & mask);
257 
258 	if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
259 		if (vlan->flags & VLAN_FLAG_GVRP)
260 			vlan_gvrp_request_join(dev);
261 		else
262 			vlan_gvrp_request_leave(dev);
263 	}
264 
265 	if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
266 		if (vlan->flags & VLAN_FLAG_MVRP)
267 			vlan_mvrp_request_join(dev);
268 		else
269 			vlan_mvrp_request_leave(dev);
270 	}
271 	return 0;
272 }
273 
274 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
275 {
276 	strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
277 }
278 
279 static int vlan_dev_open(struct net_device *dev)
280 {
281 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
282 	struct net_device *real_dev = vlan->real_dev;
283 	int err;
284 
285 	if (!(real_dev->flags & IFF_UP) &&
286 	    !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
287 		return -ENETDOWN;
288 
289 	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
290 		err = dev_uc_add(real_dev, dev->dev_addr);
291 		if (err < 0)
292 			goto out;
293 	}
294 
295 	if (dev->flags & IFF_ALLMULTI) {
296 		err = dev_set_allmulti(real_dev, 1);
297 		if (err < 0)
298 			goto del_unicast;
299 	}
300 	if (dev->flags & IFF_PROMISC) {
301 		err = dev_set_promiscuity(real_dev, 1);
302 		if (err < 0)
303 			goto clear_allmulti;
304 	}
305 
306 	ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
307 
308 	if (vlan->flags & VLAN_FLAG_GVRP)
309 		vlan_gvrp_request_join(dev);
310 
311 	if (vlan->flags & VLAN_FLAG_MVRP)
312 		vlan_mvrp_request_join(dev);
313 
314 	if (netif_carrier_ok(real_dev))
315 		netif_carrier_on(dev);
316 	return 0;
317 
318 clear_allmulti:
319 	if (dev->flags & IFF_ALLMULTI)
320 		dev_set_allmulti(real_dev, -1);
321 del_unicast:
322 	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
323 		dev_uc_del(real_dev, dev->dev_addr);
324 out:
325 	netif_carrier_off(dev);
326 	return err;
327 }
328 
329 static int vlan_dev_stop(struct net_device *dev)
330 {
331 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
332 	struct net_device *real_dev = vlan->real_dev;
333 
334 	dev_mc_unsync(real_dev, dev);
335 	dev_uc_unsync(real_dev, dev);
336 	if (dev->flags & IFF_ALLMULTI)
337 		dev_set_allmulti(real_dev, -1);
338 	if (dev->flags & IFF_PROMISC)
339 		dev_set_promiscuity(real_dev, -1);
340 
341 	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
342 		dev_uc_del(real_dev, dev->dev_addr);
343 
344 	netif_carrier_off(dev);
345 	return 0;
346 }
347 
348 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
349 {
350 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
351 	struct sockaddr *addr = p;
352 	int err;
353 
354 	if (!is_valid_ether_addr(addr->sa_data))
355 		return -EADDRNOTAVAIL;
356 
357 	if (!(dev->flags & IFF_UP))
358 		goto out;
359 
360 	if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
361 		err = dev_uc_add(real_dev, addr->sa_data);
362 		if (err < 0)
363 			return err;
364 	}
365 
366 	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
367 		dev_uc_del(real_dev, dev->dev_addr);
368 
369 out:
370 	ether_addr_copy(dev->dev_addr, addr->sa_data);
371 	return 0;
372 }
373 
374 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
375 {
376 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
377 	const struct net_device_ops *ops = real_dev->netdev_ops;
378 	struct ifreq ifrr;
379 	int err = -EOPNOTSUPP;
380 
381 	strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
382 	ifrr.ifr_ifru = ifr->ifr_ifru;
383 
384 	switch (cmd) {
385 	case SIOCGMIIPHY:
386 	case SIOCGMIIREG:
387 	case SIOCSMIIREG:
388 		if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
389 			err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
390 		break;
391 	}
392 
393 	if (!err)
394 		ifr->ifr_ifru = ifrr.ifr_ifru;
395 
396 	return err;
397 }
398 
399 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
400 {
401 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
402 	const struct net_device_ops *ops = real_dev->netdev_ops;
403 	int err = 0;
404 
405 	if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
406 		err = ops->ndo_neigh_setup(real_dev, pa);
407 
408 	return err;
409 }
410 
411 #if IS_ENABLED(CONFIG_FCOE)
412 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
413 				   struct scatterlist *sgl, unsigned int sgc)
414 {
415 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
416 	const struct net_device_ops *ops = real_dev->netdev_ops;
417 	int rc = 0;
418 
419 	if (ops->ndo_fcoe_ddp_setup)
420 		rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
421 
422 	return rc;
423 }
424 
425 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
426 {
427 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
428 	const struct net_device_ops *ops = real_dev->netdev_ops;
429 	int len = 0;
430 
431 	if (ops->ndo_fcoe_ddp_done)
432 		len = ops->ndo_fcoe_ddp_done(real_dev, xid);
433 
434 	return len;
435 }
436 
437 static int vlan_dev_fcoe_enable(struct net_device *dev)
438 {
439 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
440 	const struct net_device_ops *ops = real_dev->netdev_ops;
441 	int rc = -EINVAL;
442 
443 	if (ops->ndo_fcoe_enable)
444 		rc = ops->ndo_fcoe_enable(real_dev);
445 	return rc;
446 }
447 
448 static int vlan_dev_fcoe_disable(struct net_device *dev)
449 {
450 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
451 	const struct net_device_ops *ops = real_dev->netdev_ops;
452 	int rc = -EINVAL;
453 
454 	if (ops->ndo_fcoe_disable)
455 		rc = ops->ndo_fcoe_disable(real_dev);
456 	return rc;
457 }
458 
459 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
460 {
461 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
462 	const struct net_device_ops *ops = real_dev->netdev_ops;
463 	int rc = -EINVAL;
464 
465 	if (ops->ndo_fcoe_get_wwn)
466 		rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
467 	return rc;
468 }
469 
470 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
471 				    struct scatterlist *sgl, unsigned int sgc)
472 {
473 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
474 	const struct net_device_ops *ops = real_dev->netdev_ops;
475 	int rc = 0;
476 
477 	if (ops->ndo_fcoe_ddp_target)
478 		rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
479 
480 	return rc;
481 }
482 #endif
483 
484 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
485 {
486 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
487 
488 	if (dev->flags & IFF_UP) {
489 		if (change & IFF_ALLMULTI)
490 			dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
491 		if (change & IFF_PROMISC)
492 			dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
493 	}
494 }
495 
496 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
497 {
498 	dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
499 	dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
500 }
501 
502 /*
503  * vlan network devices have devices nesting below it, and are a special
504  * "super class" of normal network devices; split their locks off into a
505  * separate class since they always nest.
506  */
507 static struct lock_class_key vlan_netdev_xmit_lock_key;
508 static struct lock_class_key vlan_netdev_addr_lock_key;
509 
510 static void vlan_dev_set_lockdep_one(struct net_device *dev,
511 				     struct netdev_queue *txq,
512 				     void *_subclass)
513 {
514 	lockdep_set_class_and_subclass(&txq->_xmit_lock,
515 				       &vlan_netdev_xmit_lock_key,
516 				       *(int *)_subclass);
517 }
518 
519 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
520 {
521 	lockdep_set_class_and_subclass(&dev->addr_list_lock,
522 				       &vlan_netdev_addr_lock_key,
523 				       subclass);
524 	netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
525 }
526 
527 static const struct header_ops vlan_header_ops = {
528 	.create	 = vlan_dev_hard_header,
529 	.rebuild = vlan_dev_rebuild_header,
530 	.parse	 = eth_header_parse,
531 };
532 
533 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
534 				     unsigned short type,
535 				     const void *daddr, const void *saddr,
536 				     unsigned int len)
537 {
538 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
539 	struct net_device *real_dev = vlan->real_dev;
540 
541 	if (saddr == NULL)
542 		saddr = dev->dev_addr;
543 
544 	return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
545 }
546 
547 static const struct header_ops vlan_passthru_header_ops = {
548 	.create	 = vlan_passthru_hard_header,
549 	.rebuild = dev_rebuild_header,
550 	.parse	 = eth_header_parse,
551 };
552 
553 static struct device_type vlan_type = {
554 	.name	= "vlan",
555 };
556 
557 static const struct net_device_ops vlan_netdev_ops;
558 
559 static int vlan_dev_init(struct net_device *dev)
560 {
561 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
562 	int subclass = 0;
563 
564 	netif_carrier_off(dev);
565 
566 	/* IFF_BROADCAST|IFF_MULTICAST; ??? */
567 	dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
568 					  IFF_MASTER | IFF_SLAVE);
569 	dev->iflink = real_dev->ifindex;
570 	dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
571 					  (1<<__LINK_STATE_DORMANT))) |
572 		      (1<<__LINK_STATE_PRESENT);
573 
574 	dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
575 			   NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
576 			   NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
577 			   NETIF_F_ALL_FCOE;
578 
579 	dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
580 	dev->gso_max_size = real_dev->gso_max_size;
581 	if (dev->features & NETIF_F_VLAN_FEATURES)
582 		netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
583 
584 
585 	/* ipv6 shared card related stuff */
586 	dev->dev_id = real_dev->dev_id;
587 
588 	if (is_zero_ether_addr(dev->dev_addr))
589 		eth_hw_addr_inherit(dev, real_dev);
590 	if (is_zero_ether_addr(dev->broadcast))
591 		memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
592 
593 #if IS_ENABLED(CONFIG_FCOE)
594 	dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
595 #endif
596 
597 	dev->needed_headroom = real_dev->needed_headroom;
598 	if (vlan_hw_offload_capable(real_dev->features,
599 				    vlan_dev_priv(dev)->vlan_proto)) {
600 		dev->header_ops      = &vlan_passthru_header_ops;
601 		dev->hard_header_len = real_dev->hard_header_len;
602 	} else {
603 		dev->header_ops      = &vlan_header_ops;
604 		dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
605 	}
606 
607 	dev->netdev_ops = &vlan_netdev_ops;
608 
609 	SET_NETDEV_DEVTYPE(dev, &vlan_type);
610 
611 	if (is_vlan_dev(real_dev))
612 		subclass = 1;
613 
614 	vlan_dev_set_lockdep_class(dev, subclass);
615 
616 	vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
617 	if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
618 		return -ENOMEM;
619 
620 	return 0;
621 }
622 
623 static void vlan_dev_uninit(struct net_device *dev)
624 {
625 	struct vlan_priority_tci_mapping *pm;
626 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
627 	int i;
628 
629 	free_percpu(vlan->vlan_pcpu_stats);
630 	vlan->vlan_pcpu_stats = NULL;
631 	for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
632 		while ((pm = vlan->egress_priority_map[i]) != NULL) {
633 			vlan->egress_priority_map[i] = pm->next;
634 			kfree(pm);
635 		}
636 	}
637 }
638 
639 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
640 	netdev_features_t features)
641 {
642 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
643 	netdev_features_t old_features = features;
644 
645 	features &= real_dev->vlan_features;
646 	features |= NETIF_F_RXCSUM;
647 	features &= real_dev->features;
648 
649 	features |= old_features & NETIF_F_SOFT_FEATURES;
650 	features |= NETIF_F_LLTX;
651 
652 	return features;
653 }
654 
655 static int vlan_ethtool_get_settings(struct net_device *dev,
656 				     struct ethtool_cmd *cmd)
657 {
658 	const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
659 
660 	return __ethtool_get_settings(vlan->real_dev, cmd);
661 }
662 
663 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
664 				     struct ethtool_drvinfo *info)
665 {
666 	strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
667 	strlcpy(info->version, vlan_version, sizeof(info->version));
668 	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
669 }
670 
671 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
672 {
673 
674 	if (vlan_dev_priv(dev)->vlan_pcpu_stats) {
675 		struct vlan_pcpu_stats *p;
676 		u32 rx_errors = 0, tx_dropped = 0;
677 		int i;
678 
679 		for_each_possible_cpu(i) {
680 			u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
681 			unsigned int start;
682 
683 			p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
684 			do {
685 				start = u64_stats_fetch_begin_irq(&p->syncp);
686 				rxpackets	= p->rx_packets;
687 				rxbytes		= p->rx_bytes;
688 				rxmulticast	= p->rx_multicast;
689 				txpackets	= p->tx_packets;
690 				txbytes		= p->tx_bytes;
691 			} while (u64_stats_fetch_retry_irq(&p->syncp, start));
692 
693 			stats->rx_packets	+= rxpackets;
694 			stats->rx_bytes		+= rxbytes;
695 			stats->multicast	+= rxmulticast;
696 			stats->tx_packets	+= txpackets;
697 			stats->tx_bytes		+= txbytes;
698 			/* rx_errors & tx_dropped are u32 */
699 			rx_errors	+= p->rx_errors;
700 			tx_dropped	+= p->tx_dropped;
701 		}
702 		stats->rx_errors  = rx_errors;
703 		stats->tx_dropped = tx_dropped;
704 	}
705 	return stats;
706 }
707 
708 #ifdef CONFIG_NET_POLL_CONTROLLER
709 static void vlan_dev_poll_controller(struct net_device *dev)
710 {
711 	return;
712 }
713 
714 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
715 {
716 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
717 	struct net_device *real_dev = vlan->real_dev;
718 	struct netpoll *netpoll;
719 	int err = 0;
720 
721 	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
722 	err = -ENOMEM;
723 	if (!netpoll)
724 		goto out;
725 
726 	err = __netpoll_setup(netpoll, real_dev);
727 	if (err) {
728 		kfree(netpoll);
729 		goto out;
730 	}
731 
732 	vlan->netpoll = netpoll;
733 
734 out:
735 	return err;
736 }
737 
738 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
739 {
740 	struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
741 	struct netpoll *netpoll = vlan->netpoll;
742 
743 	if (!netpoll)
744 		return;
745 
746 	vlan->netpoll = NULL;
747 
748 	__netpoll_free_async(netpoll);
749 }
750 #endif /* CONFIG_NET_POLL_CONTROLLER */
751 
752 static const struct ethtool_ops vlan_ethtool_ops = {
753 	.get_settings	        = vlan_ethtool_get_settings,
754 	.get_drvinfo	        = vlan_ethtool_get_drvinfo,
755 	.get_link		= ethtool_op_get_link,
756 };
757 
758 static const struct net_device_ops vlan_netdev_ops = {
759 	.ndo_change_mtu		= vlan_dev_change_mtu,
760 	.ndo_init		= vlan_dev_init,
761 	.ndo_uninit		= vlan_dev_uninit,
762 	.ndo_open		= vlan_dev_open,
763 	.ndo_stop		= vlan_dev_stop,
764 	.ndo_start_xmit =  vlan_dev_hard_start_xmit,
765 	.ndo_validate_addr	= eth_validate_addr,
766 	.ndo_set_mac_address	= vlan_dev_set_mac_address,
767 	.ndo_set_rx_mode	= vlan_dev_set_rx_mode,
768 	.ndo_change_rx_flags	= vlan_dev_change_rx_flags,
769 	.ndo_do_ioctl		= vlan_dev_ioctl,
770 	.ndo_neigh_setup	= vlan_dev_neigh_setup,
771 	.ndo_get_stats64	= vlan_dev_get_stats64,
772 #if IS_ENABLED(CONFIG_FCOE)
773 	.ndo_fcoe_ddp_setup	= vlan_dev_fcoe_ddp_setup,
774 	.ndo_fcoe_ddp_done	= vlan_dev_fcoe_ddp_done,
775 	.ndo_fcoe_enable	= vlan_dev_fcoe_enable,
776 	.ndo_fcoe_disable	= vlan_dev_fcoe_disable,
777 	.ndo_fcoe_get_wwn	= vlan_dev_fcoe_get_wwn,
778 	.ndo_fcoe_ddp_target	= vlan_dev_fcoe_ddp_target,
779 #endif
780 #ifdef CONFIG_NET_POLL_CONTROLLER
781 	.ndo_poll_controller	= vlan_dev_poll_controller,
782 	.ndo_netpoll_setup	= vlan_dev_netpoll_setup,
783 	.ndo_netpoll_cleanup	= vlan_dev_netpoll_cleanup,
784 #endif
785 	.ndo_fix_features	= vlan_dev_fix_features,
786 };
787 
788 void vlan_setup(struct net_device *dev)
789 {
790 	ether_setup(dev);
791 
792 	dev->priv_flags		|= IFF_802_1Q_VLAN;
793 	dev->priv_flags		&= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
794 	dev->tx_queue_len	= 0;
795 
796 	dev->netdev_ops		= &vlan_netdev_ops;
797 	dev->destructor		= free_netdev;
798 	dev->ethtool_ops	= &vlan_ethtool_ops;
799 
800 	memset(dev->broadcast, 0, ETH_ALEN);
801 }
802