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Linux/net/8021q/vlan_dev.c

  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/net_tstamp.h>
 30 #include <linux/etherdevice.h>
 31 #include <linux/ethtool.h>
 32 #include <net/arp.h>
 33 #include <net/switchdev.h>
 34 
 35 #include "vlan.h"
 36 #include "vlanproc.h"
 37 #include <linux/if_vlan.h>
 38 #include <linux/netpoll.h>
 39 
 40 /*
 41  *      Create the VLAN header for an arbitrary protocol layer
 42  *
 43  *      saddr=NULL      means use device source address
 44  *      daddr=NULL      means leave destination address (eg unresolved arp)
 45  *
 46  *  This is called when the SKB is moving down the stack towards the
 47  *  physical devices.
 48  */
 49 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 50                                 unsigned short type,
 51                                 const void *daddr, const void *saddr,
 52                                 unsigned int len)
 53 {
 54         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 55         struct vlan_hdr *vhdr;
 56         unsigned int vhdrlen = 0;
 57         u16 vlan_tci = 0;
 58         int rc;
 59 
 60         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
 61                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 62 
 63                 vlan_tci = vlan->vlan_id;
 64                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 65                 vhdr->h_vlan_TCI = htons(vlan_tci);
 66 
 67                 /*
 68                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 69                  *  put the length in here instead.
 70                  */
 71                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 72                         vhdr->h_vlan_encapsulated_proto = htons(type);
 73                 else
 74                         vhdr->h_vlan_encapsulated_proto = htons(len);
 75 
 76                 skb->protocol = vlan->vlan_proto;
 77                 type = ntohs(vlan->vlan_proto);
 78                 vhdrlen = VLAN_HLEN;
 79         }
 80 
 81         /* Before delegating work to the lower layer, enter our MAC-address */
 82         if (saddr == NULL)
 83                 saddr = dev->dev_addr;
 84 
 85         /* Now make the underlying real hard header */
 86         dev = vlan->real_dev;
 87         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 88         if (rc > 0)
 89                 rc += vhdrlen;
 90         return rc;
 91 }
 92 
 93 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
 94 {
 95 #ifdef CONFIG_NET_POLL_CONTROLLER
 96         if (vlan->netpoll)
 97                 netpoll_send_skb(vlan->netpoll, skb);
 98 #else
 99         BUG();
100 #endif
101         return NETDEV_TX_OK;
102 }
103 
104 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
105                                             struct net_device *dev)
106 {
107         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
108         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
109         unsigned int len;
110         int ret;
111 
112         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
113          *
114          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
115          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
116          */
117         if (veth->h_vlan_proto != vlan->vlan_proto ||
118             vlan->flags & VLAN_FLAG_REORDER_HDR) {
119                 u16 vlan_tci;
120                 vlan_tci = vlan->vlan_id;
121                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
122                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
123         }
124 
125         skb->dev = vlan->real_dev;
126         len = skb->len;
127         if (unlikely(netpoll_tx_running(dev)))
128                 return vlan_netpoll_send_skb(vlan, skb);
129 
130         ret = dev_queue_xmit(skb);
131 
132         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
133                 struct vlan_pcpu_stats *stats;
134 
135                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
136                 u64_stats_update_begin(&stats->syncp);
137                 stats->tx_packets++;
138                 stats->tx_bytes += len;
139                 u64_stats_update_end(&stats->syncp);
140         } else {
141                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
142         }
143 
144         return ret;
145 }
146 
147 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
148 {
149         /* TODO: gotta make sure the underlying layer can handle it,
150          * maybe an IFF_VLAN_CAPABLE flag for devices?
151          */
152         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
153                 return -ERANGE;
154 
155         dev->mtu = new_mtu;
156 
157         return 0;
158 }
159 
160 void vlan_dev_set_ingress_priority(const struct net_device *dev,
161                                    u32 skb_prio, u16 vlan_prio)
162 {
163         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
164 
165         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
166                 vlan->nr_ingress_mappings--;
167         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
168                 vlan->nr_ingress_mappings++;
169 
170         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
171 }
172 
173 int vlan_dev_set_egress_priority(const struct net_device *dev,
174                                  u32 skb_prio, u16 vlan_prio)
175 {
176         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
177         struct vlan_priority_tci_mapping *mp = NULL;
178         struct vlan_priority_tci_mapping *np;
179         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
180 
181         /* See if a priority mapping exists.. */
182         mp = vlan->egress_priority_map[skb_prio & 0xF];
183         while (mp) {
184                 if (mp->priority == skb_prio) {
185                         if (mp->vlan_qos && !vlan_qos)
186                                 vlan->nr_egress_mappings--;
187                         else if (!mp->vlan_qos && vlan_qos)
188                                 vlan->nr_egress_mappings++;
189                         mp->vlan_qos = vlan_qos;
190                         return 0;
191                 }
192                 mp = mp->next;
193         }
194 
195         /* Create a new mapping then. */
196         mp = vlan->egress_priority_map[skb_prio & 0xF];
197         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
198         if (!np)
199                 return -ENOBUFS;
200 
201         np->next = mp;
202         np->priority = skb_prio;
203         np->vlan_qos = vlan_qos;
204         /* Before inserting this element in hash table, make sure all its fields
205          * are committed to memory.
206          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
207          */
208         smp_wmb();
209         vlan->egress_priority_map[skb_prio & 0xF] = np;
210         if (vlan_qos)
211                 vlan->nr_egress_mappings++;
212         return 0;
213 }
214 
215 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
216 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
217 {
218         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
219         u32 old_flags = vlan->flags;
220 
221         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
222                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
223                 return -EINVAL;
224 
225         vlan->flags = (old_flags & ~mask) | (flags & mask);
226 
227         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
228                 if (vlan->flags & VLAN_FLAG_GVRP)
229                         vlan_gvrp_request_join(dev);
230                 else
231                         vlan_gvrp_request_leave(dev);
232         }
233 
234         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
235                 if (vlan->flags & VLAN_FLAG_MVRP)
236                         vlan_mvrp_request_join(dev);
237                 else
238                         vlan_mvrp_request_leave(dev);
239         }
240         return 0;
241 }
242 
243 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
244 {
245         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
246 }
247 
248 static int vlan_dev_open(struct net_device *dev)
249 {
250         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
251         struct net_device *real_dev = vlan->real_dev;
252         int err;
253 
254         if (!(real_dev->flags & IFF_UP) &&
255             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
256                 return -ENETDOWN;
257 
258         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
259                 err = dev_uc_add(real_dev, dev->dev_addr);
260                 if (err < 0)
261                         goto out;
262         }
263 
264         if (dev->flags & IFF_ALLMULTI) {
265                 err = dev_set_allmulti(real_dev, 1);
266                 if (err < 0)
267                         goto del_unicast;
268         }
269         if (dev->flags & IFF_PROMISC) {
270                 err = dev_set_promiscuity(real_dev, 1);
271                 if (err < 0)
272                         goto clear_allmulti;
273         }
274 
275         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
276 
277         if (vlan->flags & VLAN_FLAG_GVRP)
278                 vlan_gvrp_request_join(dev);
279 
280         if (vlan->flags & VLAN_FLAG_MVRP)
281                 vlan_mvrp_request_join(dev);
282 
283         if (netif_carrier_ok(real_dev))
284                 netif_carrier_on(dev);
285         return 0;
286 
287 clear_allmulti:
288         if (dev->flags & IFF_ALLMULTI)
289                 dev_set_allmulti(real_dev, -1);
290 del_unicast:
291         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
292                 dev_uc_del(real_dev, dev->dev_addr);
293 out:
294         netif_carrier_off(dev);
295         return err;
296 }
297 
298 static int vlan_dev_stop(struct net_device *dev)
299 {
300         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
301         struct net_device *real_dev = vlan->real_dev;
302 
303         dev_mc_unsync(real_dev, dev);
304         dev_uc_unsync(real_dev, dev);
305         if (dev->flags & IFF_ALLMULTI)
306                 dev_set_allmulti(real_dev, -1);
307         if (dev->flags & IFF_PROMISC)
308                 dev_set_promiscuity(real_dev, -1);
309 
310         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
311                 dev_uc_del(real_dev, dev->dev_addr);
312 
313         netif_carrier_off(dev);
314         return 0;
315 }
316 
317 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
318 {
319         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
320         struct sockaddr *addr = p;
321         int err;
322 
323         if (!is_valid_ether_addr(addr->sa_data))
324                 return -EADDRNOTAVAIL;
325 
326         if (!(dev->flags & IFF_UP))
327                 goto out;
328 
329         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
330                 err = dev_uc_add(real_dev, addr->sa_data);
331                 if (err < 0)
332                         return err;
333         }
334 
335         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
336                 dev_uc_del(real_dev, dev->dev_addr);
337 
338 out:
339         ether_addr_copy(dev->dev_addr, addr->sa_data);
340         return 0;
341 }
342 
343 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
344 {
345         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
346         const struct net_device_ops *ops = real_dev->netdev_ops;
347         struct ifreq ifrr;
348         int err = -EOPNOTSUPP;
349 
350         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
351         ifrr.ifr_ifru = ifr->ifr_ifru;
352 
353         switch (cmd) {
354         case SIOCGMIIPHY:
355         case SIOCGMIIREG:
356         case SIOCSMIIREG:
357         case SIOCSHWTSTAMP:
358         case SIOCGHWTSTAMP:
359                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
360                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
361                 break;
362         }
363 
364         if (!err)
365                 ifr->ifr_ifru = ifrr.ifr_ifru;
366 
367         return err;
368 }
369 
370 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
371 {
372         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
373         const struct net_device_ops *ops = real_dev->netdev_ops;
374         int err = 0;
375 
376         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
377                 err = ops->ndo_neigh_setup(real_dev, pa);
378 
379         return err;
380 }
381 
382 #if IS_ENABLED(CONFIG_FCOE)
383 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
384                                    struct scatterlist *sgl, unsigned int sgc)
385 {
386         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
387         const struct net_device_ops *ops = real_dev->netdev_ops;
388         int rc = 0;
389 
390         if (ops->ndo_fcoe_ddp_setup)
391                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
392 
393         return rc;
394 }
395 
396 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
397 {
398         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
399         const struct net_device_ops *ops = real_dev->netdev_ops;
400         int len = 0;
401 
402         if (ops->ndo_fcoe_ddp_done)
403                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
404 
405         return len;
406 }
407 
408 static int vlan_dev_fcoe_enable(struct net_device *dev)
409 {
410         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
411         const struct net_device_ops *ops = real_dev->netdev_ops;
412         int rc = -EINVAL;
413 
414         if (ops->ndo_fcoe_enable)
415                 rc = ops->ndo_fcoe_enable(real_dev);
416         return rc;
417 }
418 
419 static int vlan_dev_fcoe_disable(struct net_device *dev)
420 {
421         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
422         const struct net_device_ops *ops = real_dev->netdev_ops;
423         int rc = -EINVAL;
424 
425         if (ops->ndo_fcoe_disable)
426                 rc = ops->ndo_fcoe_disable(real_dev);
427         return rc;
428 }
429 
430 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
431 {
432         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
433         const struct net_device_ops *ops = real_dev->netdev_ops;
434         int rc = -EINVAL;
435 
436         if (ops->ndo_fcoe_get_wwn)
437                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
438         return rc;
439 }
440 
441 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
442                                     struct scatterlist *sgl, unsigned int sgc)
443 {
444         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
445         const struct net_device_ops *ops = real_dev->netdev_ops;
446         int rc = 0;
447 
448         if (ops->ndo_fcoe_ddp_target)
449                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
450 
451         return rc;
452 }
453 #endif
454 
455 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
456 {
457         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
458 
459         if (dev->flags & IFF_UP) {
460                 if (change & IFF_ALLMULTI)
461                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
462                 if (change & IFF_PROMISC)
463                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
464         }
465 }
466 
467 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
468 {
469         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
470         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
471 }
472 
473 /*
474  * vlan network devices have devices nesting below it, and are a special
475  * "super class" of normal network devices; split their locks off into a
476  * separate class since they always nest.
477  */
478 static struct lock_class_key vlan_netdev_xmit_lock_key;
479 static struct lock_class_key vlan_netdev_addr_lock_key;
480 
481 static void vlan_dev_set_lockdep_one(struct net_device *dev,
482                                      struct netdev_queue *txq,
483                                      void *_subclass)
484 {
485         lockdep_set_class_and_subclass(&txq->_xmit_lock,
486                                        &vlan_netdev_xmit_lock_key,
487                                        *(int *)_subclass);
488 }
489 
490 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
491 {
492         lockdep_set_class_and_subclass(&dev->addr_list_lock,
493                                        &vlan_netdev_addr_lock_key,
494                                        subclass);
495         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
496 }
497 
498 static int vlan_dev_get_lock_subclass(struct net_device *dev)
499 {
500         return vlan_dev_priv(dev)->nest_level;
501 }
502 
503 static const struct header_ops vlan_header_ops = {
504         .create  = vlan_dev_hard_header,
505         .parse   = eth_header_parse,
506 };
507 
508 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
509                                      unsigned short type,
510                                      const void *daddr, const void *saddr,
511                                      unsigned int len)
512 {
513         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
514         struct net_device *real_dev = vlan->real_dev;
515 
516         if (saddr == NULL)
517                 saddr = dev->dev_addr;
518 
519         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
520 }
521 
522 static const struct header_ops vlan_passthru_header_ops = {
523         .create  = vlan_passthru_hard_header,
524         .parse   = eth_header_parse,
525 };
526 
527 static struct device_type vlan_type = {
528         .name   = "vlan",
529 };
530 
531 static const struct net_device_ops vlan_netdev_ops;
532 
533 static int vlan_dev_init(struct net_device *dev)
534 {
535         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
536 
537         netif_carrier_off(dev);
538 
539         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
540         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
541                                           IFF_MASTER | IFF_SLAVE);
542         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
543                                           (1<<__LINK_STATE_DORMANT))) |
544                       (1<<__LINK_STATE_PRESENT);
545 
546         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
547                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
548                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
549                            NETIF_F_ALL_FCOE;
550 
551         dev->features |= real_dev->vlan_features | NETIF_F_LLTX |
552                          NETIF_F_GSO_SOFTWARE;
553         dev->gso_max_size = real_dev->gso_max_size;
554         dev->gso_max_segs = real_dev->gso_max_segs;
555         if (dev->features & NETIF_F_VLAN_FEATURES)
556                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
557 
558         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
559 
560         /* ipv6 shared card related stuff */
561         dev->dev_id = real_dev->dev_id;
562 
563         if (is_zero_ether_addr(dev->dev_addr))
564                 eth_hw_addr_inherit(dev, real_dev);
565         if (is_zero_ether_addr(dev->broadcast))
566                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
567 
568 #if IS_ENABLED(CONFIG_FCOE)
569         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
570 #endif
571 
572         dev->needed_headroom = real_dev->needed_headroom;
573         if (vlan_hw_offload_capable(real_dev->features,
574                                     vlan_dev_priv(dev)->vlan_proto)) {
575                 dev->header_ops      = &vlan_passthru_header_ops;
576                 dev->hard_header_len = real_dev->hard_header_len;
577         } else {
578                 dev->header_ops      = &vlan_header_ops;
579                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
580         }
581 
582         dev->netdev_ops = &vlan_netdev_ops;
583 
584         SET_NETDEV_DEVTYPE(dev, &vlan_type);
585 
586         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
587 
588         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
589         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
590                 return -ENOMEM;
591 
592         return 0;
593 }
594 
595 static void vlan_dev_uninit(struct net_device *dev)
596 {
597         struct vlan_priority_tci_mapping *pm;
598         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
599         int i;
600 
601         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
602                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
603                         vlan->egress_priority_map[i] = pm->next;
604                         kfree(pm);
605                 }
606         }
607 }
608 
609 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
610         netdev_features_t features)
611 {
612         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
613         netdev_features_t old_features = features;
614 
615         features = netdev_intersect_features(features, real_dev->vlan_features);
616         features |= NETIF_F_RXCSUM;
617         features = netdev_intersect_features(features, real_dev->features);
618 
619         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
620         features |= NETIF_F_LLTX;
621 
622         return features;
623 }
624 
625 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
626                                            struct ethtool_link_ksettings *cmd)
627 {
628         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
629 
630         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
631 }
632 
633 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
634                                      struct ethtool_drvinfo *info)
635 {
636         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
637         strlcpy(info->version, vlan_version, sizeof(info->version));
638         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
639 }
640 
641 static int vlan_ethtool_get_ts_info(struct net_device *dev,
642                                     struct ethtool_ts_info *info)
643 {
644         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
645         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
646 
647         if (ops->get_ts_info) {
648                 return ops->get_ts_info(vlan->real_dev, info);
649         } else {
650                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
651                         SOF_TIMESTAMPING_SOFTWARE;
652                 info->phc_index = -1;
653         }
654 
655         return 0;
656 }
657 
658 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
659 {
660         struct vlan_pcpu_stats *p;
661         u32 rx_errors = 0, tx_dropped = 0;
662         int i;
663 
664         for_each_possible_cpu(i) {
665                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
666                 unsigned int start;
667 
668                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
669                 do {
670                         start = u64_stats_fetch_begin_irq(&p->syncp);
671                         rxpackets       = p->rx_packets;
672                         rxbytes         = p->rx_bytes;
673                         rxmulticast     = p->rx_multicast;
674                         txpackets       = p->tx_packets;
675                         txbytes         = p->tx_bytes;
676                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
677 
678                 stats->rx_packets       += rxpackets;
679                 stats->rx_bytes         += rxbytes;
680                 stats->multicast        += rxmulticast;
681                 stats->tx_packets       += txpackets;
682                 stats->tx_bytes         += txbytes;
683                 /* rx_errors & tx_dropped are u32 */
684                 rx_errors       += p->rx_errors;
685                 tx_dropped      += p->tx_dropped;
686         }
687         stats->rx_errors  = rx_errors;
688         stats->tx_dropped = tx_dropped;
689 
690         return stats;
691 }
692 
693 #ifdef CONFIG_NET_POLL_CONTROLLER
694 static void vlan_dev_poll_controller(struct net_device *dev)
695 {
696         return;
697 }
698 
699 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
700 {
701         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
702         struct net_device *real_dev = vlan->real_dev;
703         struct netpoll *netpoll;
704         int err = 0;
705 
706         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
707         err = -ENOMEM;
708         if (!netpoll)
709                 goto out;
710 
711         err = __netpoll_setup(netpoll, real_dev);
712         if (err) {
713                 kfree(netpoll);
714                 goto out;
715         }
716 
717         vlan->netpoll = netpoll;
718 
719 out:
720         return err;
721 }
722 
723 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
724 {
725         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
726         struct netpoll *netpoll = vlan->netpoll;
727 
728         if (!netpoll)
729                 return;
730 
731         vlan->netpoll = NULL;
732 
733         __netpoll_free_async(netpoll);
734 }
735 #endif /* CONFIG_NET_POLL_CONTROLLER */
736 
737 static int vlan_dev_get_iflink(const struct net_device *dev)
738 {
739         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
740 
741         return real_dev->ifindex;
742 }
743 
744 static const struct ethtool_ops vlan_ethtool_ops = {
745         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
746         .get_drvinfo            = vlan_ethtool_get_drvinfo,
747         .get_link               = ethtool_op_get_link,
748         .get_ts_info            = vlan_ethtool_get_ts_info,
749 };
750 
751 static const struct net_device_ops vlan_netdev_ops = {
752         .ndo_change_mtu         = vlan_dev_change_mtu,
753         .ndo_init               = vlan_dev_init,
754         .ndo_uninit             = vlan_dev_uninit,
755         .ndo_open               = vlan_dev_open,
756         .ndo_stop               = vlan_dev_stop,
757         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
758         .ndo_validate_addr      = eth_validate_addr,
759         .ndo_set_mac_address    = vlan_dev_set_mac_address,
760         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
761         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
762         .ndo_do_ioctl           = vlan_dev_ioctl,
763         .ndo_neigh_setup        = vlan_dev_neigh_setup,
764         .ndo_get_stats64        = vlan_dev_get_stats64,
765 #if IS_ENABLED(CONFIG_FCOE)
766         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
767         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
768         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
769         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
770         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
771         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
772 #endif
773 #ifdef CONFIG_NET_POLL_CONTROLLER
774         .ndo_poll_controller    = vlan_dev_poll_controller,
775         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
776         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
777 #endif
778         .ndo_fix_features       = vlan_dev_fix_features,
779         .ndo_fdb_add            = switchdev_port_fdb_add,
780         .ndo_fdb_del            = switchdev_port_fdb_del,
781         .ndo_fdb_dump           = switchdev_port_fdb_dump,
782         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
783         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
784         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
785         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
786         .ndo_get_iflink         = vlan_dev_get_iflink,
787 };
788 
789 static void vlan_dev_free(struct net_device *dev)
790 {
791         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
792 
793         free_percpu(vlan->vlan_pcpu_stats);
794         vlan->vlan_pcpu_stats = NULL;
795         free_netdev(dev);
796 }
797 
798 void vlan_setup(struct net_device *dev)
799 {
800         ether_setup(dev);
801 
802         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
803         dev->priv_flags         |= IFF_UNICAST_FLT;
804         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
805         netif_keep_dst(dev);
806 
807         dev->netdev_ops         = &vlan_netdev_ops;
808         dev->destructor         = vlan_dev_free;
809         dev->ethtool_ops        = &vlan_ethtool_ops;
810 
811         eth_zero_addr(dev->broadcast);
812 }
813 

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