netpoll: use GFP_ATOMIC in slave_enable_netpoll() and __netpoll_setup()
[linux-3.10.git] / drivers / net / team / team.c
1 /*
2  * drivers/net/team/team.c - Network team device driver
3  * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  */
10
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/rcupdate.h>
17 #include <linux/errno.h>
18 #include <linux/ctype.h>
19 #include <linux/notifier.h>
20 #include <linux/netdevice.h>
21 #include <linux/netpoll.h>
22 #include <linux/if_vlan.h>
23 #include <linux/if_arp.h>
24 #include <linux/socket.h>
25 #include <linux/etherdevice.h>
26 #include <linux/rtnetlink.h>
27 #include <net/rtnetlink.h>
28 #include <net/genetlink.h>
29 #include <net/netlink.h>
30 #include <net/sch_generic.h>
31 #include <linux/if_team.h>
32
33 #define DRV_NAME "team"
34
35
36 /**********
37  * Helpers
38  **********/
39
40 #define team_port_exists(dev) (dev->priv_flags & IFF_TEAM_PORT)
41
42 static struct team_port *team_port_get_rcu(const struct net_device *dev)
43 {
44         struct team_port *port = rcu_dereference(dev->rx_handler_data);
45
46         return team_port_exists(dev) ? port : NULL;
47 }
48
49 static struct team_port *team_port_get_rtnl(const struct net_device *dev)
50 {
51         struct team_port *port = rtnl_dereference(dev->rx_handler_data);
52
53         return team_port_exists(dev) ? port : NULL;
54 }
55
56 /*
57  * Since the ability to change mac address for open port device is tested in
58  * team_port_add, this function can be called without control of return value
59  */
60 static int __set_port_mac(struct net_device *port_dev,
61                           const unsigned char *dev_addr)
62 {
63         struct sockaddr addr;
64
65         memcpy(addr.sa_data, dev_addr, ETH_ALEN);
66         addr.sa_family = ARPHRD_ETHER;
67         return dev_set_mac_address(port_dev, &addr);
68 }
69
70 static int team_port_set_orig_mac(struct team_port *port)
71 {
72         return __set_port_mac(port->dev, port->orig.dev_addr);
73 }
74
75 int team_port_set_team_mac(struct team_port *port)
76 {
77         return __set_port_mac(port->dev, port->team->dev->dev_addr);
78 }
79 EXPORT_SYMBOL(team_port_set_team_mac);
80
81 static void team_refresh_port_linkup(struct team_port *port)
82 {
83         port->linkup = port->user.linkup_enabled ? port->user.linkup :
84                                                    port->state.linkup;
85 }
86
87
88 /*******************
89  * Options handling
90  *******************/
91
92 struct team_option_inst { /* One for each option instance */
93         struct list_head list;
94         struct list_head tmp_list;
95         struct team_option *option;
96         struct team_option_inst_info info;
97         bool changed;
98         bool removed;
99 };
100
101 static struct team_option *__team_find_option(struct team *team,
102                                               const char *opt_name)
103 {
104         struct team_option *option;
105
106         list_for_each_entry(option, &team->option_list, list) {
107                 if (strcmp(option->name, opt_name) == 0)
108                         return option;
109         }
110         return NULL;
111 }
112
113 static void __team_option_inst_del(struct team_option_inst *opt_inst)
114 {
115         list_del(&opt_inst->list);
116         kfree(opt_inst);
117 }
118
119 static void __team_option_inst_del_option(struct team *team,
120                                           struct team_option *option)
121 {
122         struct team_option_inst *opt_inst, *tmp;
123
124         list_for_each_entry_safe(opt_inst, tmp, &team->option_inst_list, list) {
125                 if (opt_inst->option == option)
126                         __team_option_inst_del(opt_inst);
127         }
128 }
129
130 static int __team_option_inst_add(struct team *team, struct team_option *option,
131                                   struct team_port *port)
132 {
133         struct team_option_inst *opt_inst;
134         unsigned int array_size;
135         unsigned int i;
136         int err;
137
138         array_size = option->array_size;
139         if (!array_size)
140                 array_size = 1; /* No array but still need one instance */
141
142         for (i = 0; i < array_size; i++) {
143                 opt_inst = kmalloc(sizeof(*opt_inst), GFP_KERNEL);
144                 if (!opt_inst)
145                         return -ENOMEM;
146                 opt_inst->option = option;
147                 opt_inst->info.port = port;
148                 opt_inst->info.array_index = i;
149                 opt_inst->changed = true;
150                 opt_inst->removed = false;
151                 list_add_tail(&opt_inst->list, &team->option_inst_list);
152                 if (option->init) {
153                         err = option->init(team, &opt_inst->info);
154                         if (err)
155                                 return err;
156                 }
157
158         }
159         return 0;
160 }
161
162 static int __team_option_inst_add_option(struct team *team,
163                                          struct team_option *option)
164 {
165         struct team_port *port;
166         int err;
167
168         if (!option->per_port) {
169                 err = __team_option_inst_add(team, option, NULL);
170                 if (err)
171                         goto inst_del_option;
172         }
173
174         list_for_each_entry(port, &team->port_list, list) {
175                 err = __team_option_inst_add(team, option, port);
176                 if (err)
177                         goto inst_del_option;
178         }
179         return 0;
180
181 inst_del_option:
182         __team_option_inst_del_option(team, option);
183         return err;
184 }
185
186 static void __team_option_inst_mark_removed_option(struct team *team,
187                                                    struct team_option *option)
188 {
189         struct team_option_inst *opt_inst;
190
191         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
192                 if (opt_inst->option == option) {
193                         opt_inst->changed = true;
194                         opt_inst->removed = true;
195                 }
196         }
197 }
198
199 static void __team_option_inst_del_port(struct team *team,
200                                         struct team_port *port)
201 {
202         struct team_option_inst *opt_inst, *tmp;
203
204         list_for_each_entry_safe(opt_inst, tmp, &team->option_inst_list, list) {
205                 if (opt_inst->option->per_port &&
206                     opt_inst->info.port == port)
207                         __team_option_inst_del(opt_inst);
208         }
209 }
210
211 static int __team_option_inst_add_port(struct team *team,
212                                        struct team_port *port)
213 {
214         struct team_option *option;
215         int err;
216
217         list_for_each_entry(option, &team->option_list, list) {
218                 if (!option->per_port)
219                         continue;
220                 err = __team_option_inst_add(team, option, port);
221                 if (err)
222                         goto inst_del_port;
223         }
224         return 0;
225
226 inst_del_port:
227         __team_option_inst_del_port(team, port);
228         return err;
229 }
230
231 static void __team_option_inst_mark_removed_port(struct team *team,
232                                                  struct team_port *port)
233 {
234         struct team_option_inst *opt_inst;
235
236         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
237                 if (opt_inst->info.port == port) {
238                         opt_inst->changed = true;
239                         opt_inst->removed = true;
240                 }
241         }
242 }
243
244 static int __team_options_register(struct team *team,
245                                    const struct team_option *option,
246                                    size_t option_count)
247 {
248         int i;
249         struct team_option **dst_opts;
250         int err;
251
252         dst_opts = kzalloc(sizeof(struct team_option *) * option_count,
253                            GFP_KERNEL);
254         if (!dst_opts)
255                 return -ENOMEM;
256         for (i = 0; i < option_count; i++, option++) {
257                 if (__team_find_option(team, option->name)) {
258                         err = -EEXIST;
259                         goto alloc_rollback;
260                 }
261                 dst_opts[i] = kmemdup(option, sizeof(*option), GFP_KERNEL);
262                 if (!dst_opts[i]) {
263                         err = -ENOMEM;
264                         goto alloc_rollback;
265                 }
266         }
267
268         for (i = 0; i < option_count; i++) {
269                 err = __team_option_inst_add_option(team, dst_opts[i]);
270                 if (err)
271                         goto inst_rollback;
272                 list_add_tail(&dst_opts[i]->list, &team->option_list);
273         }
274
275         kfree(dst_opts);
276         return 0;
277
278 inst_rollback:
279         for (i--; i >= 0; i--)
280                 __team_option_inst_del_option(team, dst_opts[i]);
281
282         i = option_count - 1;
283 alloc_rollback:
284         for (i--; i >= 0; i--)
285                 kfree(dst_opts[i]);
286
287         kfree(dst_opts);
288         return err;
289 }
290
291 static void __team_options_mark_removed(struct team *team,
292                                         const struct team_option *option,
293                                         size_t option_count)
294 {
295         int i;
296
297         for (i = 0; i < option_count; i++, option++) {
298                 struct team_option *del_opt;
299
300                 del_opt = __team_find_option(team, option->name);
301                 if (del_opt)
302                         __team_option_inst_mark_removed_option(team, del_opt);
303         }
304 }
305
306 static void __team_options_unregister(struct team *team,
307                                       const struct team_option *option,
308                                       size_t option_count)
309 {
310         int i;
311
312         for (i = 0; i < option_count; i++, option++) {
313                 struct team_option *del_opt;
314
315                 del_opt = __team_find_option(team, option->name);
316                 if (del_opt) {
317                         __team_option_inst_del_option(team, del_opt);
318                         list_del(&del_opt->list);
319                         kfree(del_opt);
320                 }
321         }
322 }
323
324 static void __team_options_change_check(struct team *team);
325
326 int team_options_register(struct team *team,
327                           const struct team_option *option,
328                           size_t option_count)
329 {
330         int err;
331
332         err = __team_options_register(team, option, option_count);
333         if (err)
334                 return err;
335         __team_options_change_check(team);
336         return 0;
337 }
338 EXPORT_SYMBOL(team_options_register);
339
340 void team_options_unregister(struct team *team,
341                              const struct team_option *option,
342                              size_t option_count)
343 {
344         __team_options_mark_removed(team, option, option_count);
345         __team_options_change_check(team);
346         __team_options_unregister(team, option, option_count);
347 }
348 EXPORT_SYMBOL(team_options_unregister);
349
350 static int team_option_get(struct team *team,
351                            struct team_option_inst *opt_inst,
352                            struct team_gsetter_ctx *ctx)
353 {
354         if (!opt_inst->option->getter)
355                 return -EOPNOTSUPP;
356         return opt_inst->option->getter(team, ctx);
357 }
358
359 static int team_option_set(struct team *team,
360                            struct team_option_inst *opt_inst,
361                            struct team_gsetter_ctx *ctx)
362 {
363         if (!opt_inst->option->setter)
364                 return -EOPNOTSUPP;
365         return opt_inst->option->setter(team, ctx);
366 }
367
368 void team_option_inst_set_change(struct team_option_inst_info *opt_inst_info)
369 {
370         struct team_option_inst *opt_inst;
371
372         opt_inst = container_of(opt_inst_info, struct team_option_inst, info);
373         opt_inst->changed = true;
374 }
375 EXPORT_SYMBOL(team_option_inst_set_change);
376
377 void team_options_change_check(struct team *team)
378 {
379         __team_options_change_check(team);
380 }
381 EXPORT_SYMBOL(team_options_change_check);
382
383
384 /****************
385  * Mode handling
386  ****************/
387
388 static LIST_HEAD(mode_list);
389 static DEFINE_SPINLOCK(mode_list_lock);
390
391 struct team_mode_item {
392         struct list_head list;
393         const struct team_mode *mode;
394 };
395
396 static struct team_mode_item *__find_mode(const char *kind)
397 {
398         struct team_mode_item *mitem;
399
400         list_for_each_entry(mitem, &mode_list, list) {
401                 if (strcmp(mitem->mode->kind, kind) == 0)
402                         return mitem;
403         }
404         return NULL;
405 }
406
407 static bool is_good_mode_name(const char *name)
408 {
409         while (*name != '\0') {
410                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
411                         return false;
412                 name++;
413         }
414         return true;
415 }
416
417 int team_mode_register(const struct team_mode *mode)
418 {
419         int err = 0;
420         struct team_mode_item *mitem;
421
422         if (!is_good_mode_name(mode->kind) ||
423             mode->priv_size > TEAM_MODE_PRIV_SIZE)
424                 return -EINVAL;
425
426         mitem = kmalloc(sizeof(*mitem), GFP_KERNEL);
427         if (!mitem)
428                 return -ENOMEM;
429
430         spin_lock(&mode_list_lock);
431         if (__find_mode(mode->kind)) {
432                 err = -EEXIST;
433                 kfree(mitem);
434                 goto unlock;
435         }
436         mitem->mode = mode;
437         list_add_tail(&mitem->list, &mode_list);
438 unlock:
439         spin_unlock(&mode_list_lock);
440         return err;
441 }
442 EXPORT_SYMBOL(team_mode_register);
443
444 void team_mode_unregister(const struct team_mode *mode)
445 {
446         struct team_mode_item *mitem;
447
448         spin_lock(&mode_list_lock);
449         mitem = __find_mode(mode->kind);
450         if (mitem) {
451                 list_del_init(&mitem->list);
452                 kfree(mitem);
453         }
454         spin_unlock(&mode_list_lock);
455 }
456 EXPORT_SYMBOL(team_mode_unregister);
457
458 static const struct team_mode *team_mode_get(const char *kind)
459 {
460         struct team_mode_item *mitem;
461         const struct team_mode *mode = NULL;
462
463         spin_lock(&mode_list_lock);
464         mitem = __find_mode(kind);
465         if (!mitem) {
466                 spin_unlock(&mode_list_lock);
467                 request_module("team-mode-%s", kind);
468                 spin_lock(&mode_list_lock);
469                 mitem = __find_mode(kind);
470         }
471         if (mitem) {
472                 mode = mitem->mode;
473                 if (!try_module_get(mode->owner))
474                         mode = NULL;
475         }
476
477         spin_unlock(&mode_list_lock);
478         return mode;
479 }
480
481 static void team_mode_put(const struct team_mode *mode)
482 {
483         module_put(mode->owner);
484 }
485
486 static bool team_dummy_transmit(struct team *team, struct sk_buff *skb)
487 {
488         dev_kfree_skb_any(skb);
489         return false;
490 }
491
492 rx_handler_result_t team_dummy_receive(struct team *team,
493                                        struct team_port *port,
494                                        struct sk_buff *skb)
495 {
496         return RX_HANDLER_ANOTHER;
497 }
498
499 static const struct team_mode __team_no_mode = {
500         .kind           = "*NOMODE*",
501 };
502
503 static bool team_is_mode_set(struct team *team)
504 {
505         return team->mode != &__team_no_mode;
506 }
507
508 static void team_set_no_mode(struct team *team)
509 {
510         team->mode = &__team_no_mode;
511 }
512
513 static void __team_adjust_ops(struct team *team, int en_port_count)
514 {
515         /*
516          * To avoid checks in rx/tx skb paths, ensure here that non-null and
517          * correct ops are always set.
518          */
519
520         if (!en_port_count || !team_is_mode_set(team) ||
521             !team->mode->ops->transmit)
522                 team->ops.transmit = team_dummy_transmit;
523         else
524                 team->ops.transmit = team->mode->ops->transmit;
525
526         if (!en_port_count || !team_is_mode_set(team) ||
527             !team->mode->ops->receive)
528                 team->ops.receive = team_dummy_receive;
529         else
530                 team->ops.receive = team->mode->ops->receive;
531 }
532
533 static void team_adjust_ops(struct team *team)
534 {
535         __team_adjust_ops(team, team->en_port_count);
536 }
537
538 /*
539  * We can benefit from the fact that it's ensured no port is present
540  * at the time of mode change. Therefore no packets are in fly so there's no
541  * need to set mode operations in any special way.
542  */
543 static int __team_change_mode(struct team *team,
544                               const struct team_mode *new_mode)
545 {
546         /* Check if mode was previously set and do cleanup if so */
547         if (team_is_mode_set(team)) {
548                 void (*exit_op)(struct team *team) = team->ops.exit;
549
550                 /* Clear ops area so no callback is called any longer */
551                 memset(&team->ops, 0, sizeof(struct team_mode_ops));
552                 team_adjust_ops(team);
553
554                 if (exit_op)
555                         exit_op(team);
556                 team_mode_put(team->mode);
557                 team_set_no_mode(team);
558                 /* zero private data area */
559                 memset(&team->mode_priv, 0,
560                        sizeof(struct team) - offsetof(struct team, mode_priv));
561         }
562
563         if (!new_mode)
564                 return 0;
565
566         if (new_mode->ops->init) {
567                 int err;
568
569                 err = new_mode->ops->init(team);
570                 if (err)
571                         return err;
572         }
573
574         team->mode = new_mode;
575         memcpy(&team->ops, new_mode->ops, sizeof(struct team_mode_ops));
576         team_adjust_ops(team);
577
578         return 0;
579 }
580
581 static int team_change_mode(struct team *team, const char *kind)
582 {
583         const struct team_mode *new_mode;
584         struct net_device *dev = team->dev;
585         int err;
586
587         if (!list_empty(&team->port_list)) {
588                 netdev_err(dev, "No ports can be present during mode change\n");
589                 return -EBUSY;
590         }
591
592         if (team_is_mode_set(team) && strcmp(team->mode->kind, kind) == 0) {
593                 netdev_err(dev, "Unable to change to the same mode the team is in\n");
594                 return -EINVAL;
595         }
596
597         new_mode = team_mode_get(kind);
598         if (!new_mode) {
599                 netdev_err(dev, "Mode \"%s\" not found\n", kind);
600                 return -EINVAL;
601         }
602
603         err = __team_change_mode(team, new_mode);
604         if (err) {
605                 netdev_err(dev, "Failed to change to mode \"%s\"\n", kind);
606                 team_mode_put(new_mode);
607                 return err;
608         }
609
610         netdev_info(dev, "Mode changed to \"%s\"\n", kind);
611         return 0;
612 }
613
614
615 /************************
616  * Rx path frame handler
617  ************************/
618
619 /* note: already called with rcu_read_lock */
620 static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
621 {
622         struct sk_buff *skb = *pskb;
623         struct team_port *port;
624         struct team *team;
625         rx_handler_result_t res;
626
627         skb = skb_share_check(skb, GFP_ATOMIC);
628         if (!skb)
629                 return RX_HANDLER_CONSUMED;
630
631         *pskb = skb;
632
633         port = team_port_get_rcu(skb->dev);
634         team = port->team;
635         if (!team_port_enabled(port)) {
636                 /* allow exact match delivery for disabled ports */
637                 res = RX_HANDLER_EXACT;
638         } else {
639                 res = team->ops.receive(team, port, skb);
640         }
641         if (res == RX_HANDLER_ANOTHER) {
642                 struct team_pcpu_stats *pcpu_stats;
643
644                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
645                 u64_stats_update_begin(&pcpu_stats->syncp);
646                 pcpu_stats->rx_packets++;
647                 pcpu_stats->rx_bytes += skb->len;
648                 if (skb->pkt_type == PACKET_MULTICAST)
649                         pcpu_stats->rx_multicast++;
650                 u64_stats_update_end(&pcpu_stats->syncp);
651
652                 skb->dev = team->dev;
653         } else {
654                 this_cpu_inc(team->pcpu_stats->rx_dropped);
655         }
656
657         return res;
658 }
659
660
661 /****************
662  * Port handling
663  ****************/
664
665 static bool team_port_find(const struct team *team,
666                            const struct team_port *port)
667 {
668         struct team_port *cur;
669
670         list_for_each_entry(cur, &team->port_list, list)
671                 if (cur == port)
672                         return true;
673         return false;
674 }
675
676 /*
677  * Enable/disable port by adding to enabled port hashlist and setting
678  * port->index (Might be racy so reader could see incorrect ifindex when
679  * processing a flying packet, but that is not a problem). Write guarded
680  * by team->lock.
681  */
682 static void team_port_enable(struct team *team,
683                              struct team_port *port)
684 {
685         if (team_port_enabled(port))
686                 return;
687         port->index = team->en_port_count++;
688         hlist_add_head_rcu(&port->hlist,
689                            team_port_index_hash(team, port->index));
690         team_adjust_ops(team);
691         if (team->ops.port_enabled)
692                 team->ops.port_enabled(team, port);
693 }
694
695 static void __reconstruct_port_hlist(struct team *team, int rm_index)
696 {
697         int i;
698         struct team_port *port;
699
700         for (i = rm_index + 1; i < team->en_port_count; i++) {
701                 port = team_get_port_by_index(team, i);
702                 hlist_del_rcu(&port->hlist);
703                 port->index--;
704                 hlist_add_head_rcu(&port->hlist,
705                                    team_port_index_hash(team, port->index));
706         }
707 }
708
709 static void team_port_disable(struct team *team,
710                               struct team_port *port)
711 {
712         if (!team_port_enabled(port))
713                 return;
714         if (team->ops.port_disabled)
715                 team->ops.port_disabled(team, port);
716         hlist_del_rcu(&port->hlist);
717         __reconstruct_port_hlist(team, port->index);
718         port->index = -1;
719         __team_adjust_ops(team, team->en_port_count - 1);
720         /*
721          * Wait until readers see adjusted ops. This ensures that
722          * readers never see team->en_port_count == 0
723          */
724         synchronize_rcu();
725         team->en_port_count--;
726 }
727
728 #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
729                             NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
730                             NETIF_F_HIGHDMA | NETIF_F_LRO)
731
732 static void __team_compute_features(struct team *team)
733 {
734         struct team_port *port;
735         u32 vlan_features = TEAM_VLAN_FEATURES;
736         unsigned short max_hard_header_len = ETH_HLEN;
737         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
738
739         list_for_each_entry(port, &team->port_list, list) {
740                 vlan_features = netdev_increment_features(vlan_features,
741                                         port->dev->vlan_features,
742                                         TEAM_VLAN_FEATURES);
743
744                 dst_release_flag &= port->dev->priv_flags;
745                 if (port->dev->hard_header_len > max_hard_header_len)
746                         max_hard_header_len = port->dev->hard_header_len;
747         }
748
749         team->dev->vlan_features = vlan_features;
750         team->dev->hard_header_len = max_hard_header_len;
751
752         flags = team->dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
753         team->dev->priv_flags = flags | dst_release_flag;
754
755         netdev_change_features(team->dev);
756 }
757
758 static void team_compute_features(struct team *team)
759 {
760         mutex_lock(&team->lock);
761         __team_compute_features(team);
762         mutex_unlock(&team->lock);
763 }
764
765 static int team_port_enter(struct team *team, struct team_port *port)
766 {
767         int err = 0;
768
769         dev_hold(team->dev);
770         port->dev->priv_flags |= IFF_TEAM_PORT;
771         if (team->ops.port_enter) {
772                 err = team->ops.port_enter(team, port);
773                 if (err) {
774                         netdev_err(team->dev, "Device %s failed to enter team mode\n",
775                                    port->dev->name);
776                         goto err_port_enter;
777                 }
778         }
779
780         return 0;
781
782 err_port_enter:
783         port->dev->priv_flags &= ~IFF_TEAM_PORT;
784         dev_put(team->dev);
785
786         return err;
787 }
788
789 static void team_port_leave(struct team *team, struct team_port *port)
790 {
791         if (team->ops.port_leave)
792                 team->ops.port_leave(team, port);
793         port->dev->priv_flags &= ~IFF_TEAM_PORT;
794         dev_put(team->dev);
795 }
796
797 #ifdef CONFIG_NET_POLL_CONTROLLER
798 static int team_port_enable_netpoll(struct team *team, struct team_port *port,
799                                     gfp_t gfp)
800 {
801         struct netpoll *np;
802         int err;
803
804         np = kzalloc(sizeof(*np), gfp);
805         if (!np)
806                 return -ENOMEM;
807
808         err = __netpoll_setup(np, port->dev, gfp);
809         if (err) {
810                 kfree(np);
811                 return err;
812         }
813         port->np = np;
814         return err;
815 }
816
817 static void team_port_disable_netpoll(struct team_port *port)
818 {
819         struct netpoll *np = port->np;
820
821         if (!np)
822                 return;
823         port->np = NULL;
824
825         /* Wait for transmitting packets to finish before freeing. */
826         synchronize_rcu_bh();
827         __netpoll_cleanup(np);
828         kfree(np);
829 }
830
831 static struct netpoll_info *team_netpoll_info(struct team *team)
832 {
833         return team->dev->npinfo;
834 }
835
836 #else
837 static int team_port_enable_netpoll(struct team *team, struct team_port *port,
838                                     gfp_t gfp)
839 {
840         return 0;
841 }
842 static void team_port_disable_netpoll(struct team_port *port)
843 {
844 }
845 static struct netpoll_info *team_netpoll_info(struct team *team)
846 {
847         return NULL;
848 }
849 #endif
850
851 static void __team_port_change_check(struct team_port *port, bool linkup);
852
853 static int team_port_add(struct team *team, struct net_device *port_dev)
854 {
855         struct net_device *dev = team->dev;
856         struct team_port *port;
857         char *portname = port_dev->name;
858         int err;
859
860         if (port_dev->flags & IFF_LOOPBACK ||
861             port_dev->type != ARPHRD_ETHER) {
862                 netdev_err(dev, "Device %s is of an unsupported type\n",
863                            portname);
864                 return -EINVAL;
865         }
866
867         if (team_port_exists(port_dev)) {
868                 netdev_err(dev, "Device %s is already a port "
869                                 "of a team device\n", portname);
870                 return -EBUSY;
871         }
872
873         if (port_dev->flags & IFF_UP) {
874                 netdev_err(dev, "Device %s is up. Set it down before adding it as a team port\n",
875                            portname);
876                 return -EBUSY;
877         }
878
879         port = kzalloc(sizeof(struct team_port) + team->mode->port_priv_size,
880                        GFP_KERNEL);
881         if (!port)
882                 return -ENOMEM;
883
884         port->dev = port_dev;
885         port->team = team;
886
887         port->orig.mtu = port_dev->mtu;
888         err = dev_set_mtu(port_dev, dev->mtu);
889         if (err) {
890                 netdev_dbg(dev, "Error %d calling dev_set_mtu\n", err);
891                 goto err_set_mtu;
892         }
893
894         memcpy(port->orig.dev_addr, port_dev->dev_addr, ETH_ALEN);
895
896         err = team_port_enter(team, port);
897         if (err) {
898                 netdev_err(dev, "Device %s failed to enter team mode\n",
899                            portname);
900                 goto err_port_enter;
901         }
902
903         err = dev_open(port_dev);
904         if (err) {
905                 netdev_dbg(dev, "Device %s opening failed\n",
906                            portname);
907                 goto err_dev_open;
908         }
909
910         err = vlan_vids_add_by_dev(port_dev, dev);
911         if (err) {
912                 netdev_err(dev, "Failed to add vlan ids to device %s\n",
913                                 portname);
914                 goto err_vids_add;
915         }
916
917         if (team_netpoll_info(team)) {
918                 err = team_port_enable_netpoll(team, port, GFP_KERNEL);
919                 if (err) {
920                         netdev_err(dev, "Failed to enable netpoll on device %s\n",
921                                    portname);
922                         goto err_enable_netpoll;
923                 }
924         }
925
926         err = netdev_set_master(port_dev, dev);
927         if (err) {
928                 netdev_err(dev, "Device %s failed to set master\n", portname);
929                 goto err_set_master;
930         }
931
932         err = netdev_rx_handler_register(port_dev, team_handle_frame,
933                                          port);
934         if (err) {
935                 netdev_err(dev, "Device %s failed to register rx_handler\n",
936                            portname);
937                 goto err_handler_register;
938         }
939
940         err = __team_option_inst_add_port(team, port);
941         if (err) {
942                 netdev_err(dev, "Device %s failed to add per-port options\n",
943                            portname);
944                 goto err_option_port_add;
945         }
946
947         port->index = -1;
948         team_port_enable(team, port);
949         list_add_tail_rcu(&port->list, &team->port_list);
950         __team_compute_features(team);
951         __team_port_change_check(port, !!netif_carrier_ok(port_dev));
952         __team_options_change_check(team);
953
954         netdev_info(dev, "Port device %s added\n", portname);
955
956         return 0;
957
958 err_option_port_add:
959         netdev_rx_handler_unregister(port_dev);
960
961 err_handler_register:
962         netdev_set_master(port_dev, NULL);
963
964 err_set_master:
965         team_port_disable_netpoll(port);
966
967 err_enable_netpoll:
968         vlan_vids_del_by_dev(port_dev, dev);
969
970 err_vids_add:
971         dev_close(port_dev);
972
973 err_dev_open:
974         team_port_leave(team, port);
975         team_port_set_orig_mac(port);
976
977 err_port_enter:
978         dev_set_mtu(port_dev, port->orig.mtu);
979
980 err_set_mtu:
981         kfree(port);
982
983         return err;
984 }
985
986 static int team_port_del(struct team *team, struct net_device *port_dev)
987 {
988         struct net_device *dev = team->dev;
989         struct team_port *port;
990         char *portname = port_dev->name;
991
992         port = team_port_get_rtnl(port_dev);
993         if (!port || !team_port_find(team, port)) {
994                 netdev_err(dev, "Device %s does not act as a port of this team\n",
995                            portname);
996                 return -ENOENT;
997         }
998
999         __team_option_inst_mark_removed_port(team, port);
1000         __team_options_change_check(team);
1001         __team_option_inst_del_port(team, port);
1002         port->removed = true;
1003         __team_port_change_check(port, false);
1004         team_port_disable(team, port);
1005         list_del_rcu(&port->list);
1006         netdev_rx_handler_unregister(port_dev);
1007         netdev_set_master(port_dev, NULL);
1008         team_port_disable_netpoll(port);
1009         vlan_vids_del_by_dev(port_dev, dev);
1010         dev_close(port_dev);
1011         team_port_leave(team, port);
1012         team_port_set_orig_mac(port);
1013         dev_set_mtu(port_dev, port->orig.mtu);
1014         synchronize_rcu();
1015         kfree(port);
1016         netdev_info(dev, "Port device %s removed\n", portname);
1017         __team_compute_features(team);
1018
1019         return 0;
1020 }
1021
1022
1023 /*****************
1024  * Net device ops
1025  *****************/
1026
1027 static int team_mode_option_get(struct team *team, struct team_gsetter_ctx *ctx)
1028 {
1029         ctx->data.str_val = team->mode->kind;
1030         return 0;
1031 }
1032
1033 static int team_mode_option_set(struct team *team, struct team_gsetter_ctx *ctx)
1034 {
1035         return team_change_mode(team, ctx->data.str_val);
1036 }
1037
1038 static int team_port_en_option_get(struct team *team,
1039                                    struct team_gsetter_ctx *ctx)
1040 {
1041         struct team_port *port = ctx->info->port;
1042
1043         ctx->data.bool_val = team_port_enabled(port);
1044         return 0;
1045 }
1046
1047 static int team_port_en_option_set(struct team *team,
1048                                    struct team_gsetter_ctx *ctx)
1049 {
1050         struct team_port *port = ctx->info->port;
1051
1052         if (ctx->data.bool_val)
1053                 team_port_enable(team, port);
1054         else
1055                 team_port_disable(team, port);
1056         return 0;
1057 }
1058
1059 static int team_user_linkup_option_get(struct team *team,
1060                                        struct team_gsetter_ctx *ctx)
1061 {
1062         struct team_port *port = ctx->info->port;
1063
1064         ctx->data.bool_val = port->user.linkup;
1065         return 0;
1066 }
1067
1068 static int team_user_linkup_option_set(struct team *team,
1069                                        struct team_gsetter_ctx *ctx)
1070 {
1071         struct team_port *port = ctx->info->port;
1072
1073         port->user.linkup = ctx->data.bool_val;
1074         team_refresh_port_linkup(port);
1075         return 0;
1076 }
1077
1078 static int team_user_linkup_en_option_get(struct team *team,
1079                                           struct team_gsetter_ctx *ctx)
1080 {
1081         struct team_port *port = ctx->info->port;
1082
1083         ctx->data.bool_val = port->user.linkup_enabled;
1084         return 0;
1085 }
1086
1087 static int team_user_linkup_en_option_set(struct team *team,
1088                                           struct team_gsetter_ctx *ctx)
1089 {
1090         struct team_port *port = ctx->info->port;
1091
1092         port->user.linkup_enabled = ctx->data.bool_val;
1093         team_refresh_port_linkup(port);
1094         return 0;
1095 }
1096
1097 static const struct team_option team_options[] = {
1098         {
1099                 .name = "mode",
1100                 .type = TEAM_OPTION_TYPE_STRING,
1101                 .getter = team_mode_option_get,
1102                 .setter = team_mode_option_set,
1103         },
1104         {
1105                 .name = "enabled",
1106                 .type = TEAM_OPTION_TYPE_BOOL,
1107                 .per_port = true,
1108                 .getter = team_port_en_option_get,
1109                 .setter = team_port_en_option_set,
1110         },
1111         {
1112                 .name = "user_linkup",
1113                 .type = TEAM_OPTION_TYPE_BOOL,
1114                 .per_port = true,
1115                 .getter = team_user_linkup_option_get,
1116                 .setter = team_user_linkup_option_set,
1117         },
1118         {
1119                 .name = "user_linkup_enabled",
1120                 .type = TEAM_OPTION_TYPE_BOOL,
1121                 .per_port = true,
1122                 .getter = team_user_linkup_en_option_get,
1123                 .setter = team_user_linkup_en_option_set,
1124         },
1125 };
1126
1127 static struct lock_class_key team_netdev_xmit_lock_key;
1128 static struct lock_class_key team_netdev_addr_lock_key;
1129
1130 static void team_set_lockdep_class_one(struct net_device *dev,
1131                                        struct netdev_queue *txq,
1132                                        void *unused)
1133 {
1134         lockdep_set_class(&txq->_xmit_lock, &team_netdev_xmit_lock_key);
1135 }
1136
1137 static void team_set_lockdep_class(struct net_device *dev)
1138 {
1139         lockdep_set_class(&dev->addr_list_lock, &team_netdev_addr_lock_key);
1140         netdev_for_each_tx_queue(dev, team_set_lockdep_class_one, NULL);
1141 }
1142
1143 static int team_init(struct net_device *dev)
1144 {
1145         struct team *team = netdev_priv(dev);
1146         int i;
1147         int err;
1148
1149         team->dev = dev;
1150         mutex_init(&team->lock);
1151         team_set_no_mode(team);
1152
1153         team->pcpu_stats = alloc_percpu(struct team_pcpu_stats);
1154         if (!team->pcpu_stats)
1155                 return -ENOMEM;
1156
1157         for (i = 0; i < TEAM_PORT_HASHENTRIES; i++)
1158                 INIT_HLIST_HEAD(&team->en_port_hlist[i]);
1159         INIT_LIST_HEAD(&team->port_list);
1160
1161         team_adjust_ops(team);
1162
1163         INIT_LIST_HEAD(&team->option_list);
1164         INIT_LIST_HEAD(&team->option_inst_list);
1165         err = team_options_register(team, team_options, ARRAY_SIZE(team_options));
1166         if (err)
1167                 goto err_options_register;
1168         netif_carrier_off(dev);
1169
1170         team_set_lockdep_class(dev);
1171
1172         return 0;
1173
1174 err_options_register:
1175         free_percpu(team->pcpu_stats);
1176
1177         return err;
1178 }
1179
1180 static void team_uninit(struct net_device *dev)
1181 {
1182         struct team *team = netdev_priv(dev);
1183         struct team_port *port;
1184         struct team_port *tmp;
1185
1186         mutex_lock(&team->lock);
1187         list_for_each_entry_safe(port, tmp, &team->port_list, list)
1188                 team_port_del(team, port->dev);
1189
1190         __team_change_mode(team, NULL); /* cleanup */
1191         __team_options_unregister(team, team_options, ARRAY_SIZE(team_options));
1192         mutex_unlock(&team->lock);
1193 }
1194
1195 static void team_destructor(struct net_device *dev)
1196 {
1197         struct team *team = netdev_priv(dev);
1198
1199         free_percpu(team->pcpu_stats);
1200         free_netdev(dev);
1201 }
1202
1203 static int team_open(struct net_device *dev)
1204 {
1205         netif_carrier_on(dev);
1206         return 0;
1207 }
1208
1209 static int team_close(struct net_device *dev)
1210 {
1211         netif_carrier_off(dev);
1212         return 0;
1213 }
1214
1215 /*
1216  * note: already called with rcu_read_lock
1217  */
1218 static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
1219 {
1220         struct team *team = netdev_priv(dev);
1221         bool tx_success = false;
1222         unsigned int len = skb->len;
1223
1224         tx_success = team->ops.transmit(team, skb);
1225         if (tx_success) {
1226                 struct team_pcpu_stats *pcpu_stats;
1227
1228                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
1229                 u64_stats_update_begin(&pcpu_stats->syncp);
1230                 pcpu_stats->tx_packets++;
1231                 pcpu_stats->tx_bytes += len;
1232                 u64_stats_update_end(&pcpu_stats->syncp);
1233         } else {
1234                 this_cpu_inc(team->pcpu_stats->tx_dropped);
1235         }
1236
1237         return NETDEV_TX_OK;
1238 }
1239
1240 static u16 team_select_queue(struct net_device *dev, struct sk_buff *skb)
1241 {
1242         /*
1243          * This helper function exists to help dev_pick_tx get the correct
1244          * destination queue.  Using a helper function skips a call to
1245          * skb_tx_hash and will put the skbs in the queue we expect on their
1246          * way down to the team driver.
1247          */
1248         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
1249
1250         /*
1251          * Save the original txq to restore before passing to the driver
1252          */
1253         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
1254
1255         if (unlikely(txq >= dev->real_num_tx_queues)) {
1256                 do {
1257                         txq -= dev->real_num_tx_queues;
1258                 } while (txq >= dev->real_num_tx_queues);
1259         }
1260         return txq;
1261 }
1262
1263 static void team_change_rx_flags(struct net_device *dev, int change)
1264 {
1265         struct team *team = netdev_priv(dev);
1266         struct team_port *port;
1267         int inc;
1268
1269         rcu_read_lock();
1270         list_for_each_entry_rcu(port, &team->port_list, list) {
1271                 if (change & IFF_PROMISC) {
1272                         inc = dev->flags & IFF_PROMISC ? 1 : -1;
1273                         dev_set_promiscuity(port->dev, inc);
1274                 }
1275                 if (change & IFF_ALLMULTI) {
1276                         inc = dev->flags & IFF_ALLMULTI ? 1 : -1;
1277                         dev_set_allmulti(port->dev, inc);
1278                 }
1279         }
1280         rcu_read_unlock();
1281 }
1282
1283 static void team_set_rx_mode(struct net_device *dev)
1284 {
1285         struct team *team = netdev_priv(dev);
1286         struct team_port *port;
1287
1288         rcu_read_lock();
1289         list_for_each_entry_rcu(port, &team->port_list, list) {
1290                 dev_uc_sync(port->dev, dev);
1291                 dev_mc_sync(port->dev, dev);
1292         }
1293         rcu_read_unlock();
1294 }
1295
1296 static int team_set_mac_address(struct net_device *dev, void *p)
1297 {
1298         struct team *team = netdev_priv(dev);
1299         struct team_port *port;
1300         int err;
1301
1302         err = eth_mac_addr(dev, p);
1303         if (err)
1304                 return err;
1305         rcu_read_lock();
1306         list_for_each_entry_rcu(port, &team->port_list, list)
1307                 if (team->ops.port_change_mac)
1308                         team->ops.port_change_mac(team, port);
1309         rcu_read_unlock();
1310         return 0;
1311 }
1312
1313 static int team_change_mtu(struct net_device *dev, int new_mtu)
1314 {
1315         struct team *team = netdev_priv(dev);
1316         struct team_port *port;
1317         int err;
1318
1319         /*
1320          * Alhough this is reader, it's guarded by team lock. It's not possible
1321          * to traverse list in reverse under rcu_read_lock
1322          */
1323         mutex_lock(&team->lock);
1324         list_for_each_entry(port, &team->port_list, list) {
1325                 err = dev_set_mtu(port->dev, new_mtu);
1326                 if (err) {
1327                         netdev_err(dev, "Device %s failed to change mtu",
1328                                    port->dev->name);
1329                         goto unwind;
1330                 }
1331         }
1332         mutex_unlock(&team->lock);
1333
1334         dev->mtu = new_mtu;
1335
1336         return 0;
1337
1338 unwind:
1339         list_for_each_entry_continue_reverse(port, &team->port_list, list)
1340                 dev_set_mtu(port->dev, dev->mtu);
1341         mutex_unlock(&team->lock);
1342
1343         return err;
1344 }
1345
1346 static struct rtnl_link_stats64 *
1347 team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1348 {
1349         struct team *team = netdev_priv(dev);
1350         struct team_pcpu_stats *p;
1351         u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
1352         u32 rx_dropped = 0, tx_dropped = 0;
1353         unsigned int start;
1354         int i;
1355
1356         for_each_possible_cpu(i) {
1357                 p = per_cpu_ptr(team->pcpu_stats, i);
1358                 do {
1359                         start = u64_stats_fetch_begin_bh(&p->syncp);
1360                         rx_packets      = p->rx_packets;
1361                         rx_bytes        = p->rx_bytes;
1362                         rx_multicast    = p->rx_multicast;
1363                         tx_packets      = p->tx_packets;
1364                         tx_bytes        = p->tx_bytes;
1365                 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
1366
1367                 stats->rx_packets       += rx_packets;
1368                 stats->rx_bytes         += rx_bytes;
1369                 stats->multicast        += rx_multicast;
1370                 stats->tx_packets       += tx_packets;
1371                 stats->tx_bytes         += tx_bytes;
1372                 /*
1373                  * rx_dropped & tx_dropped are u32, updated
1374                  * without syncp protection.
1375                  */
1376                 rx_dropped      += p->rx_dropped;
1377                 tx_dropped      += p->tx_dropped;
1378         }
1379         stats->rx_dropped       = rx_dropped;
1380         stats->tx_dropped       = tx_dropped;
1381         return stats;
1382 }
1383
1384 static int team_vlan_rx_add_vid(struct net_device *dev, uint16_t vid)
1385 {
1386         struct team *team = netdev_priv(dev);
1387         struct team_port *port;
1388         int err;
1389
1390         /*
1391          * Alhough this is reader, it's guarded by team lock. It's not possible
1392          * to traverse list in reverse under rcu_read_lock
1393          */
1394         mutex_lock(&team->lock);
1395         list_for_each_entry(port, &team->port_list, list) {
1396                 err = vlan_vid_add(port->dev, vid);
1397                 if (err)
1398                         goto unwind;
1399         }
1400         mutex_unlock(&team->lock);
1401
1402         return 0;
1403
1404 unwind:
1405         list_for_each_entry_continue_reverse(port, &team->port_list, list)
1406                 vlan_vid_del(port->dev, vid);
1407         mutex_unlock(&team->lock);
1408
1409         return err;
1410 }
1411
1412 static int team_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
1413 {
1414         struct team *team = netdev_priv(dev);
1415         struct team_port *port;
1416
1417         rcu_read_lock();
1418         list_for_each_entry_rcu(port, &team->port_list, list)
1419                 vlan_vid_del(port->dev, vid);
1420         rcu_read_unlock();
1421
1422         return 0;
1423 }
1424
1425 #ifdef CONFIG_NET_POLL_CONTROLLER
1426 static void team_poll_controller(struct net_device *dev)
1427 {
1428 }
1429
1430 static void __team_netpoll_cleanup(struct team *team)
1431 {
1432         struct team_port *port;
1433
1434         list_for_each_entry(port, &team->port_list, list)
1435                 team_port_disable_netpoll(port);
1436 }
1437
1438 static void team_netpoll_cleanup(struct net_device *dev)
1439 {
1440         struct team *team = netdev_priv(dev);
1441
1442         mutex_lock(&team->lock);
1443         __team_netpoll_cleanup(team);
1444         mutex_unlock(&team->lock);
1445 }
1446
1447 static int team_netpoll_setup(struct net_device *dev,
1448                               struct netpoll_info *npifo, gfp_t gfp)
1449 {
1450         struct team *team = netdev_priv(dev);
1451         struct team_port *port;
1452         int err = 0;
1453
1454         mutex_lock(&team->lock);
1455         list_for_each_entry(port, &team->port_list, list) {
1456                 err = team_port_enable_netpoll(team, port, gfp);
1457                 if (err) {
1458                         __team_netpoll_cleanup(team);
1459                         break;
1460                 }
1461         }
1462         mutex_unlock(&team->lock);
1463         return err;
1464 }
1465 #endif
1466
1467 static int team_add_slave(struct net_device *dev, struct net_device *port_dev)
1468 {
1469         struct team *team = netdev_priv(dev);
1470         int err;
1471
1472         mutex_lock(&team->lock);
1473         err = team_port_add(team, port_dev);
1474         mutex_unlock(&team->lock);
1475         return err;
1476 }
1477
1478 static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
1479 {
1480         struct team *team = netdev_priv(dev);
1481         int err;
1482
1483         mutex_lock(&team->lock);
1484         err = team_port_del(team, port_dev);
1485         mutex_unlock(&team->lock);
1486         return err;
1487 }
1488
1489 static netdev_features_t team_fix_features(struct net_device *dev,
1490                                            netdev_features_t features)
1491 {
1492         struct team_port *port;
1493         struct team *team = netdev_priv(dev);
1494         netdev_features_t mask;
1495
1496         mask = features;
1497         features &= ~NETIF_F_ONE_FOR_ALL;
1498         features |= NETIF_F_ALL_FOR_ALL;
1499
1500         rcu_read_lock();
1501         list_for_each_entry_rcu(port, &team->port_list, list) {
1502                 features = netdev_increment_features(features,
1503                                                      port->dev->features,
1504                                                      mask);
1505         }
1506         rcu_read_unlock();
1507         return features;
1508 }
1509
1510 static const struct net_device_ops team_netdev_ops = {
1511         .ndo_init               = team_init,
1512         .ndo_uninit             = team_uninit,
1513         .ndo_open               = team_open,
1514         .ndo_stop               = team_close,
1515         .ndo_start_xmit         = team_xmit,
1516         .ndo_select_queue       = team_select_queue,
1517         .ndo_change_rx_flags    = team_change_rx_flags,
1518         .ndo_set_rx_mode        = team_set_rx_mode,
1519         .ndo_set_mac_address    = team_set_mac_address,
1520         .ndo_change_mtu         = team_change_mtu,
1521         .ndo_get_stats64        = team_get_stats64,
1522         .ndo_vlan_rx_add_vid    = team_vlan_rx_add_vid,
1523         .ndo_vlan_rx_kill_vid   = team_vlan_rx_kill_vid,
1524 #ifdef CONFIG_NET_POLL_CONTROLLER
1525         .ndo_poll_controller    = team_poll_controller,
1526         .ndo_netpoll_setup      = team_netpoll_setup,
1527         .ndo_netpoll_cleanup    = team_netpoll_cleanup,
1528 #endif
1529         .ndo_add_slave          = team_add_slave,
1530         .ndo_del_slave          = team_del_slave,
1531         .ndo_fix_features       = team_fix_features,
1532 };
1533
1534
1535 /***********************
1536  * rt netlink interface
1537  ***********************/
1538
1539 static void team_setup(struct net_device *dev)
1540 {
1541         ether_setup(dev);
1542
1543         dev->netdev_ops = &team_netdev_ops;
1544         dev->destructor = team_destructor;
1545         dev->tx_queue_len = 0;
1546         dev->flags |= IFF_MULTICAST;
1547         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
1548
1549         /*
1550          * Indicate we support unicast address filtering. That way core won't
1551          * bring us to promisc mode in case a unicast addr is added.
1552          * Let this up to underlay drivers.
1553          */
1554         dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1555
1556         dev->features |= NETIF_F_LLTX;
1557         dev->features |= NETIF_F_GRO;
1558         dev->hw_features = NETIF_F_HW_VLAN_TX |
1559                            NETIF_F_HW_VLAN_RX |
1560                            NETIF_F_HW_VLAN_FILTER;
1561
1562         dev->features |= dev->hw_features;
1563 }
1564
1565 static int team_newlink(struct net *src_net, struct net_device *dev,
1566                         struct nlattr *tb[], struct nlattr *data[])
1567 {
1568         int err;
1569
1570         if (tb[IFLA_ADDRESS] == NULL)
1571                 eth_hw_addr_random(dev);
1572
1573         err = register_netdevice(dev);
1574         if (err)
1575                 return err;
1576
1577         return 0;
1578 }
1579
1580 static int team_validate(struct nlattr *tb[], struct nlattr *data[])
1581 {
1582         if (tb[IFLA_ADDRESS]) {
1583                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1584                         return -EINVAL;
1585                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1586                         return -EADDRNOTAVAIL;
1587         }
1588         return 0;
1589 }
1590
1591 static unsigned int team_get_num_tx_queues(void)
1592 {
1593         return TEAM_DEFAULT_NUM_TX_QUEUES;
1594 }
1595
1596 static unsigned int team_get_num_rx_queues(void)
1597 {
1598         return TEAM_DEFAULT_NUM_RX_QUEUES;
1599 }
1600
1601 static struct rtnl_link_ops team_link_ops __read_mostly = {
1602         .kind                   = DRV_NAME,
1603         .priv_size              = sizeof(struct team),
1604         .setup                  = team_setup,
1605         .newlink                = team_newlink,
1606         .validate               = team_validate,
1607         .get_num_tx_queues      = team_get_num_tx_queues,
1608         .get_num_rx_queues      = team_get_num_rx_queues,
1609 };
1610
1611
1612 /***********************************
1613  * Generic netlink custom interface
1614  ***********************************/
1615
1616 static struct genl_family team_nl_family = {
1617         .id             = GENL_ID_GENERATE,
1618         .name           = TEAM_GENL_NAME,
1619         .version        = TEAM_GENL_VERSION,
1620         .maxattr        = TEAM_ATTR_MAX,
1621         .netnsok        = true,
1622 };
1623
1624 static const struct nla_policy team_nl_policy[TEAM_ATTR_MAX + 1] = {
1625         [TEAM_ATTR_UNSPEC]                      = { .type = NLA_UNSPEC, },
1626         [TEAM_ATTR_TEAM_IFINDEX]                = { .type = NLA_U32 },
1627         [TEAM_ATTR_LIST_OPTION]                 = { .type = NLA_NESTED },
1628         [TEAM_ATTR_LIST_PORT]                   = { .type = NLA_NESTED },
1629 };
1630
1631 static const struct nla_policy
1632 team_nl_option_policy[TEAM_ATTR_OPTION_MAX + 1] = {
1633         [TEAM_ATTR_OPTION_UNSPEC]               = { .type = NLA_UNSPEC, },
1634         [TEAM_ATTR_OPTION_NAME] = {
1635                 .type = NLA_STRING,
1636                 .len = TEAM_STRING_MAX_LEN,
1637         },
1638         [TEAM_ATTR_OPTION_CHANGED]              = { .type = NLA_FLAG },
1639         [TEAM_ATTR_OPTION_TYPE]                 = { .type = NLA_U8 },
1640         [TEAM_ATTR_OPTION_DATA]                 = { .type = NLA_BINARY },
1641 };
1642
1643 static int team_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
1644 {
1645         struct sk_buff *msg;
1646         void *hdr;
1647         int err;
1648
1649         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1650         if (!msg)
1651                 return -ENOMEM;
1652
1653         hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
1654                           &team_nl_family, 0, TEAM_CMD_NOOP);
1655         if (IS_ERR(hdr)) {
1656                 err = PTR_ERR(hdr);
1657                 goto err_msg_put;
1658         }
1659
1660         genlmsg_end(msg, hdr);
1661
1662         return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
1663
1664 err_msg_put:
1665         nlmsg_free(msg);
1666
1667         return err;
1668 }
1669
1670 /*
1671  * Netlink cmd functions should be locked by following two functions.
1672  * Since dev gets held here, that ensures dev won't disappear in between.
1673  */
1674 static struct team *team_nl_team_get(struct genl_info *info)
1675 {
1676         struct net *net = genl_info_net(info);
1677         int ifindex;
1678         struct net_device *dev;
1679         struct team *team;
1680
1681         if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX])
1682                 return NULL;
1683
1684         ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]);
1685         dev = dev_get_by_index(net, ifindex);
1686         if (!dev || dev->netdev_ops != &team_netdev_ops) {
1687                 if (dev)
1688                         dev_put(dev);
1689                 return NULL;
1690         }
1691
1692         team = netdev_priv(dev);
1693         mutex_lock(&team->lock);
1694         return team;
1695 }
1696
1697 static void team_nl_team_put(struct team *team)
1698 {
1699         mutex_unlock(&team->lock);
1700         dev_put(team->dev);
1701 }
1702
1703 static int team_nl_send_generic(struct genl_info *info, struct team *team,
1704                                 int (*fill_func)(struct sk_buff *skb,
1705                                                  struct genl_info *info,
1706                                                  int flags, struct team *team))
1707 {
1708         struct sk_buff *skb;
1709         int err;
1710
1711         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1712         if (!skb)
1713                 return -ENOMEM;
1714
1715         err = fill_func(skb, info, NLM_F_ACK, team);
1716         if (err < 0)
1717                 goto err_fill;
1718
1719         err = genlmsg_unicast(genl_info_net(info), skb, info->snd_pid);
1720         return err;
1721
1722 err_fill:
1723         nlmsg_free(skb);
1724         return err;
1725 }
1726
1727 typedef int team_nl_send_func_t(struct sk_buff *skb,
1728                                 struct team *team, u32 pid);
1729
1730 static int team_nl_send_unicast(struct sk_buff *skb, struct team *team, u32 pid)
1731 {
1732         return genlmsg_unicast(dev_net(team->dev), skb, pid);
1733 }
1734
1735 static int team_nl_fill_one_option_get(struct sk_buff *skb, struct team *team,
1736                                        struct team_option_inst *opt_inst)
1737 {
1738         struct nlattr *option_item;
1739         struct team_option *option = opt_inst->option;
1740         struct team_option_inst_info *opt_inst_info = &opt_inst->info;
1741         struct team_gsetter_ctx ctx;
1742         int err;
1743
1744         ctx.info = opt_inst_info;
1745         err = team_option_get(team, opt_inst, &ctx);
1746         if (err)
1747                 return err;
1748
1749         option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
1750         if (!option_item)
1751                 return -EMSGSIZE;
1752
1753         if (nla_put_string(skb, TEAM_ATTR_OPTION_NAME, option->name))
1754                 goto nest_cancel;
1755         if (opt_inst_info->port &&
1756             nla_put_u32(skb, TEAM_ATTR_OPTION_PORT_IFINDEX,
1757                         opt_inst_info->port->dev->ifindex))
1758                 goto nest_cancel;
1759         if (opt_inst->option->array_size &&
1760             nla_put_u32(skb, TEAM_ATTR_OPTION_ARRAY_INDEX,
1761                         opt_inst_info->array_index))
1762                 goto nest_cancel;
1763
1764         switch (option->type) {
1765         case TEAM_OPTION_TYPE_U32:
1766                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32))
1767                         goto nest_cancel;
1768                 if (nla_put_u32(skb, TEAM_ATTR_OPTION_DATA, ctx.data.u32_val))
1769                         goto nest_cancel;
1770                 break;
1771         case TEAM_OPTION_TYPE_STRING:
1772                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING))
1773                         goto nest_cancel;
1774                 if (nla_put_string(skb, TEAM_ATTR_OPTION_DATA,
1775                                    ctx.data.str_val))
1776                         goto nest_cancel;
1777                 break;
1778         case TEAM_OPTION_TYPE_BINARY:
1779                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_BINARY))
1780                         goto nest_cancel;
1781                 if (nla_put(skb, TEAM_ATTR_OPTION_DATA, ctx.data.bin_val.len,
1782                             ctx.data.bin_val.ptr))
1783                         goto nest_cancel;
1784                 break;
1785         case TEAM_OPTION_TYPE_BOOL:
1786                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_FLAG))
1787                         goto nest_cancel;
1788                 if (ctx.data.bool_val &&
1789                     nla_put_flag(skb, TEAM_ATTR_OPTION_DATA))
1790                         goto nest_cancel;
1791                 break;
1792         default:
1793                 BUG();
1794         }
1795         if (opt_inst->removed && nla_put_flag(skb, TEAM_ATTR_OPTION_REMOVED))
1796                 goto nest_cancel;
1797         if (opt_inst->changed) {
1798                 if (nla_put_flag(skb, TEAM_ATTR_OPTION_CHANGED))
1799                         goto nest_cancel;
1800                 opt_inst->changed = false;
1801         }
1802         nla_nest_end(skb, option_item);
1803         return 0;
1804
1805 nest_cancel:
1806         nla_nest_cancel(skb, option_item);
1807         return -EMSGSIZE;
1808 }
1809
1810 static int __send_and_alloc_skb(struct sk_buff **pskb,
1811                                 struct team *team, u32 pid,
1812                                 team_nl_send_func_t *send_func)
1813 {
1814         int err;
1815
1816         if (*pskb) {
1817                 err = send_func(*pskb, team, pid);
1818                 if (err)
1819                         return err;
1820         }
1821         *pskb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
1822         if (!*pskb)
1823                 return -ENOMEM;
1824         return 0;
1825 }
1826
1827 static int team_nl_send_options_get(struct team *team, u32 pid, u32 seq,
1828                                     int flags, team_nl_send_func_t *send_func,
1829                                     struct list_head *sel_opt_inst_list)
1830 {
1831         struct nlattr *option_list;
1832         struct nlmsghdr *nlh;
1833         void *hdr;
1834         struct team_option_inst *opt_inst;
1835         int err;
1836         struct sk_buff *skb = NULL;
1837         bool incomplete;
1838         int i;
1839
1840         opt_inst = list_first_entry(sel_opt_inst_list,
1841                                     struct team_option_inst, tmp_list);
1842
1843 start_again:
1844         err = __send_and_alloc_skb(&skb, team, pid, send_func);
1845         if (err)
1846                 return err;
1847
1848         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags | NLM_F_MULTI,
1849                           TEAM_CMD_OPTIONS_GET);
1850         if (IS_ERR(hdr))
1851                 return PTR_ERR(hdr);
1852
1853         if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
1854                 goto nla_put_failure;
1855         option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
1856         if (!option_list)
1857                 goto nla_put_failure;
1858
1859         i = 0;
1860         incomplete = false;
1861         list_for_each_entry_from(opt_inst, sel_opt_inst_list, tmp_list) {
1862                 err = team_nl_fill_one_option_get(skb, team, opt_inst);
1863                 if (err) {
1864                         if (err == -EMSGSIZE) {
1865                                 if (!i)
1866                                         goto errout;
1867                                 incomplete = true;
1868                                 break;
1869                         }
1870                         goto errout;
1871                 }
1872                 i++;
1873         }
1874
1875         nla_nest_end(skb, option_list);
1876         genlmsg_end(skb, hdr);
1877         if (incomplete)
1878                 goto start_again;
1879
1880 send_done:
1881         nlh = nlmsg_put(skb, pid, seq, NLMSG_DONE, 0, flags | NLM_F_MULTI);
1882         if (!nlh) {
1883                 err = __send_and_alloc_skb(&skb, team, pid, send_func);
1884                 if (err)
1885                         goto errout;
1886                 goto send_done;
1887         }
1888
1889         return send_func(skb, team, pid);
1890
1891 nla_put_failure:
1892         err = -EMSGSIZE;
1893 errout:
1894         genlmsg_cancel(skb, hdr);
1895         nlmsg_free(skb);
1896         return err;
1897 }
1898
1899 static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info)
1900 {
1901         struct team *team;
1902         struct team_option_inst *opt_inst;
1903         int err;
1904         LIST_HEAD(sel_opt_inst_list);
1905
1906         team = team_nl_team_get(info);
1907         if (!team)
1908                 return -EINVAL;
1909
1910         list_for_each_entry(opt_inst, &team->option_inst_list, list)
1911                 list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list);
1912         err = team_nl_send_options_get(team, info->snd_pid, info->snd_seq,
1913                                        NLM_F_ACK, team_nl_send_unicast,
1914                                        &sel_opt_inst_list);
1915
1916         team_nl_team_put(team);
1917
1918         return err;
1919 }
1920
1921 static int team_nl_send_event_options_get(struct team *team,
1922                                           struct list_head *sel_opt_inst_list);
1923
1924 static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
1925 {
1926         struct team *team;
1927         int err = 0;
1928         int i;
1929         struct nlattr *nl_option;
1930         LIST_HEAD(opt_inst_list);
1931
1932         team = team_nl_team_get(info);
1933         if (!team)
1934                 return -EINVAL;
1935
1936         err = -EINVAL;
1937         if (!info->attrs[TEAM_ATTR_LIST_OPTION]) {
1938                 err = -EINVAL;
1939                 goto team_put;
1940         }
1941
1942         nla_for_each_nested(nl_option, info->attrs[TEAM_ATTR_LIST_OPTION], i) {
1943                 struct nlattr *opt_attrs[TEAM_ATTR_OPTION_MAX + 1];
1944                 struct nlattr *attr;
1945                 struct nlattr *attr_data;
1946                 enum team_option_type opt_type;
1947                 int opt_port_ifindex = 0; /* != 0 for per-port options */
1948                 u32 opt_array_index = 0;
1949                 bool opt_is_array = false;
1950                 struct team_option_inst *opt_inst;
1951                 char *opt_name;
1952                 bool opt_found = false;
1953
1954                 if (nla_type(nl_option) != TEAM_ATTR_ITEM_OPTION) {
1955                         err = -EINVAL;
1956                         goto team_put;
1957                 }
1958                 err = nla_parse_nested(opt_attrs, TEAM_ATTR_OPTION_MAX,
1959                                        nl_option, team_nl_option_policy);
1960                 if (err)
1961                         goto team_put;
1962                 if (!opt_attrs[TEAM_ATTR_OPTION_NAME] ||
1963                     !opt_attrs[TEAM_ATTR_OPTION_TYPE]) {
1964                         err = -EINVAL;
1965                         goto team_put;
1966                 }
1967                 switch (nla_get_u8(opt_attrs[TEAM_ATTR_OPTION_TYPE])) {
1968                 case NLA_U32:
1969                         opt_type = TEAM_OPTION_TYPE_U32;
1970                         break;
1971                 case NLA_STRING:
1972                         opt_type = TEAM_OPTION_TYPE_STRING;
1973                         break;
1974                 case NLA_BINARY:
1975                         opt_type = TEAM_OPTION_TYPE_BINARY;
1976                         break;
1977                 case NLA_FLAG:
1978                         opt_type = TEAM_OPTION_TYPE_BOOL;
1979                         break;
1980                 default:
1981                         goto team_put;
1982                 }
1983
1984                 attr_data = opt_attrs[TEAM_ATTR_OPTION_DATA];
1985                 if (opt_type != TEAM_OPTION_TYPE_BOOL && !attr_data) {
1986                         err = -EINVAL;
1987                         goto team_put;
1988                 }
1989
1990                 opt_name = nla_data(opt_attrs[TEAM_ATTR_OPTION_NAME]);
1991                 attr = opt_attrs[TEAM_ATTR_OPTION_PORT_IFINDEX];
1992                 if (attr)
1993                         opt_port_ifindex = nla_get_u32(attr);
1994
1995                 attr = opt_attrs[TEAM_ATTR_OPTION_ARRAY_INDEX];
1996                 if (attr) {
1997                         opt_is_array = true;
1998                         opt_array_index = nla_get_u32(attr);
1999                 }
2000
2001                 list_for_each_entry(opt_inst, &team->option_inst_list, list) {
2002                         struct team_option *option = opt_inst->option;
2003                         struct team_gsetter_ctx ctx;
2004                         struct team_option_inst_info *opt_inst_info;
2005                         int tmp_ifindex;
2006
2007                         opt_inst_info = &opt_inst->info;
2008                         tmp_ifindex = opt_inst_info->port ?
2009                                       opt_inst_info->port->dev->ifindex : 0;
2010                         if (option->type != opt_type ||
2011                             strcmp(option->name, opt_name) ||
2012                             tmp_ifindex != opt_port_ifindex ||
2013                             (option->array_size && !opt_is_array) ||
2014                             opt_inst_info->array_index != opt_array_index)
2015                                 continue;
2016                         opt_found = true;
2017                         ctx.info = opt_inst_info;
2018                         switch (opt_type) {
2019                         case TEAM_OPTION_TYPE_U32:
2020                                 ctx.data.u32_val = nla_get_u32(attr_data);
2021                                 break;
2022                         case TEAM_OPTION_TYPE_STRING:
2023                                 if (nla_len(attr_data) > TEAM_STRING_MAX_LEN) {
2024                                         err = -EINVAL;
2025                                         goto team_put;
2026                                 }
2027                                 ctx.data.str_val = nla_data(attr_data);
2028                                 break;
2029                         case TEAM_OPTION_TYPE_BINARY:
2030                                 ctx.data.bin_val.len = nla_len(attr_data);
2031                                 ctx.data.bin_val.ptr = nla_data(attr_data);
2032                                 break;
2033                         case TEAM_OPTION_TYPE_BOOL:
2034                                 ctx.data.bool_val = attr_data ? true : false;
2035                                 break;
2036                         default:
2037                                 BUG();
2038                         }
2039                         err = team_option_set(team, opt_inst, &ctx);
2040                         if (err)
2041                                 goto team_put;
2042                         opt_inst->changed = true;
2043                         list_add(&opt_inst->tmp_list, &opt_inst_list);
2044                 }
2045                 if (!opt_found) {
2046                         err = -ENOENT;
2047                         goto team_put;
2048                 }
2049         }
2050
2051         err = team_nl_send_event_options_get(team, &opt_inst_list);
2052
2053 team_put:
2054         team_nl_team_put(team);
2055
2056         return err;
2057 }
2058
2059 static int team_nl_fill_port_list_get(struct sk_buff *skb,
2060                                       u32 pid, u32 seq, int flags,
2061                                       struct team *team,
2062                                       bool fillall)
2063 {
2064         struct nlattr *port_list;
2065         void *hdr;
2066         struct team_port *port;
2067
2068         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
2069                           TEAM_CMD_PORT_LIST_GET);
2070         if (IS_ERR(hdr))
2071                 return PTR_ERR(hdr);
2072
2073         if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
2074                 goto nla_put_failure;
2075         port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
2076         if (!port_list)
2077                 goto nla_put_failure;
2078
2079         list_for_each_entry(port, &team->port_list, list) {
2080                 struct nlattr *port_item;
2081
2082                 /* Include only changed ports if fill all mode is not on */
2083                 if (!fillall && !port->changed)
2084                         continue;
2085                 port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT);
2086                 if (!port_item)
2087                         goto nla_put_failure;
2088                 if (nla_put_u32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex))
2089                         goto nla_put_failure;
2090                 if (port->changed) {
2091                         if (nla_put_flag(skb, TEAM_ATTR_PORT_CHANGED))
2092                                 goto nla_put_failure;
2093                         port->changed = false;
2094                 }
2095                 if ((port->removed &&
2096                      nla_put_flag(skb, TEAM_ATTR_PORT_REMOVED)) ||
2097                     (port->state.linkup &&
2098                      nla_put_flag(skb, TEAM_ATTR_PORT_LINKUP)) ||
2099                     nla_put_u32(skb, TEAM_ATTR_PORT_SPEED, port->state.speed) ||
2100                     nla_put_u8(skb, TEAM_ATTR_PORT_DUPLEX, port->state.duplex))
2101                         goto nla_put_failure;
2102                 nla_nest_end(skb, port_item);
2103         }
2104
2105         nla_nest_end(skb, port_list);
2106         return genlmsg_end(skb, hdr);
2107
2108 nla_put_failure:
2109         genlmsg_cancel(skb, hdr);
2110         return -EMSGSIZE;
2111 }
2112
2113 static int team_nl_fill_port_list_get_all(struct sk_buff *skb,
2114                                           struct genl_info *info, int flags,
2115                                           struct team *team)
2116 {
2117         return team_nl_fill_port_list_get(skb, info->snd_pid,
2118                                           info->snd_seq, NLM_F_ACK,
2119                                           team, true);
2120 }
2121
2122 static int team_nl_cmd_port_list_get(struct sk_buff *skb,
2123                                      struct genl_info *info)
2124 {
2125         struct team *team;
2126         int err;
2127
2128         team = team_nl_team_get(info);
2129         if (!team)
2130                 return -EINVAL;
2131
2132         err = team_nl_send_generic(info, team, team_nl_fill_port_list_get_all);
2133
2134         team_nl_team_put(team);
2135
2136         return err;
2137 }
2138
2139 static struct genl_ops team_nl_ops[] = {
2140         {
2141                 .cmd = TEAM_CMD_NOOP,
2142                 .doit = team_nl_cmd_noop,
2143                 .policy = team_nl_policy,
2144         },
2145         {
2146                 .cmd = TEAM_CMD_OPTIONS_SET,
2147                 .doit = team_nl_cmd_options_set,
2148                 .policy = team_nl_policy,
2149                 .flags = GENL_ADMIN_PERM,
2150         },
2151         {
2152                 .cmd = TEAM_CMD_OPTIONS_GET,
2153                 .doit = team_nl_cmd_options_get,
2154                 .policy = team_nl_policy,
2155                 .flags = GENL_ADMIN_PERM,
2156         },
2157         {
2158                 .cmd = TEAM_CMD_PORT_LIST_GET,
2159                 .doit = team_nl_cmd_port_list_get,
2160                 .policy = team_nl_policy,
2161                 .flags = GENL_ADMIN_PERM,
2162         },
2163 };
2164
2165 static struct genl_multicast_group team_change_event_mcgrp = {
2166         .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME,
2167 };
2168
2169 static int team_nl_send_multicast(struct sk_buff *skb,
2170                                   struct team *team, u32 pid)
2171 {
2172         return genlmsg_multicast_netns(dev_net(team->dev), skb, 0,
2173                                        team_change_event_mcgrp.id, GFP_KERNEL);
2174 }
2175
2176 static int team_nl_send_event_options_get(struct team *team,
2177                                           struct list_head *sel_opt_inst_list)
2178 {
2179         return team_nl_send_options_get(team, 0, 0, 0, team_nl_send_multicast,
2180                                         sel_opt_inst_list);
2181 }
2182
2183 static int team_nl_send_event_port_list_get(struct team *team)
2184 {
2185         struct sk_buff *skb;
2186         int err;
2187         struct net *net = dev_net(team->dev);
2188
2189         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2190         if (!skb)
2191                 return -ENOMEM;
2192
2193         err = team_nl_fill_port_list_get(skb, 0, 0, 0, team, false);
2194         if (err < 0)
2195                 goto err_fill;
2196
2197         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
2198                                       GFP_KERNEL);
2199         return err;
2200
2201 err_fill:
2202         nlmsg_free(skb);
2203         return err;
2204 }
2205
2206 static int team_nl_init(void)
2207 {
2208         int err;
2209
2210         err = genl_register_family_with_ops(&team_nl_family, team_nl_ops,
2211                                             ARRAY_SIZE(team_nl_ops));
2212         if (err)
2213                 return err;
2214
2215         err = genl_register_mc_group(&team_nl_family, &team_change_event_mcgrp);
2216         if (err)
2217                 goto err_change_event_grp_reg;
2218
2219         return 0;
2220
2221 err_change_event_grp_reg:
2222         genl_unregister_family(&team_nl_family);
2223
2224         return err;
2225 }
2226
2227 static void team_nl_fini(void)
2228 {
2229         genl_unregister_family(&team_nl_family);
2230 }
2231
2232
2233 /******************
2234  * Change checkers
2235  ******************/
2236
2237 static void __team_options_change_check(struct team *team)
2238 {
2239         int err;
2240         struct team_option_inst *opt_inst;
2241         LIST_HEAD(sel_opt_inst_list);
2242
2243         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
2244                 if (opt_inst->changed)
2245                         list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list);
2246         }
2247         err = team_nl_send_event_options_get(team, &sel_opt_inst_list);
2248         if (err)
2249                 netdev_warn(team->dev, "Failed to send options change via netlink (err %d)\n",
2250                             err);
2251 }
2252
2253 /* rtnl lock is held */
2254 static void __team_port_change_check(struct team_port *port, bool linkup)
2255 {
2256         int err;
2257
2258         if (!port->removed && port->state.linkup == linkup)
2259                 return;
2260
2261         port->changed = true;
2262         port->state.linkup = linkup;
2263         team_refresh_port_linkup(port);
2264         if (linkup) {
2265                 struct ethtool_cmd ecmd;
2266
2267                 err = __ethtool_get_settings(port->dev, &ecmd);
2268                 if (!err) {
2269                         port->state.speed = ethtool_cmd_speed(&ecmd);
2270                         port->state.duplex = ecmd.duplex;
2271                         goto send_event;
2272                 }
2273         }
2274         port->state.speed = 0;
2275         port->state.duplex = 0;
2276
2277 send_event:
2278         err = team_nl_send_event_port_list_get(port->team);
2279         if (err)
2280                 netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink\n",
2281                             port->dev->name);
2282
2283 }
2284
2285 static void team_port_change_check(struct team_port *port, bool linkup)
2286 {
2287         struct team *team = port->team;
2288
2289         mutex_lock(&team->lock);
2290         __team_port_change_check(port, linkup);
2291         mutex_unlock(&team->lock);
2292 }
2293
2294
2295 /************************************
2296  * Net device notifier event handler
2297  ************************************/
2298
2299 static int team_device_event(struct notifier_block *unused,
2300                              unsigned long event, void *ptr)
2301 {
2302         struct net_device *dev = (struct net_device *) ptr;
2303         struct team_port *port;
2304
2305         port = team_port_get_rtnl(dev);
2306         if (!port)
2307                 return NOTIFY_DONE;
2308
2309         switch (event) {
2310         case NETDEV_UP:
2311                 if (netif_carrier_ok(dev))
2312                         team_port_change_check(port, true);
2313         case NETDEV_DOWN:
2314                 team_port_change_check(port, false);
2315         case NETDEV_CHANGE:
2316                 if (netif_running(port->dev))
2317                         team_port_change_check(port,
2318                                                !!netif_carrier_ok(port->dev));
2319                 break;
2320         case NETDEV_UNREGISTER:
2321                 team_del_slave(port->team->dev, dev);
2322                 break;
2323         case NETDEV_FEAT_CHANGE:
2324                 team_compute_features(port->team);
2325                 break;
2326         case NETDEV_CHANGEMTU:
2327                 /* Forbid to change mtu of underlaying device */
2328                 return NOTIFY_BAD;
2329         case NETDEV_PRE_TYPE_CHANGE:
2330                 /* Forbid to change type of underlaying device */
2331                 return NOTIFY_BAD;
2332         }
2333         return NOTIFY_DONE;
2334 }
2335
2336 static struct notifier_block team_notifier_block __read_mostly = {
2337         .notifier_call = team_device_event,
2338 };
2339
2340
2341 /***********************
2342  * Module init and exit
2343  ***********************/
2344
2345 static int __init team_module_init(void)
2346 {
2347         int err;
2348
2349         register_netdevice_notifier(&team_notifier_block);
2350
2351         err = rtnl_link_register(&team_link_ops);
2352         if (err)
2353                 goto err_rtnl_reg;
2354
2355         err = team_nl_init();
2356         if (err)
2357                 goto err_nl_init;
2358
2359         return 0;
2360
2361 err_nl_init:
2362         rtnl_link_unregister(&team_link_ops);
2363
2364 err_rtnl_reg:
2365         unregister_netdevice_notifier(&team_notifier_block);
2366
2367         return err;
2368 }
2369
2370 static void __exit team_module_exit(void)
2371 {
2372         team_nl_fini();
2373         rtnl_link_unregister(&team_link_ops);
2374         unregister_netdevice_notifier(&team_notifier_block);
2375 }
2376
2377 module_init(team_module_init);
2378 module_exit(team_module_exit);
2379
2380 MODULE_LICENSE("GPL v2");
2381 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
2382 MODULE_DESCRIPTION("Ethernet team device driver");
2383 MODULE_ALIAS_RTNL_LINK(DRV_NAME);