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Merge tag 'mips_4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips
[mirror_ubuntu-hirsute-kernel.git] / net / ncsi / ncsi-manage.c
1 /*
2 * Copyright Gavin Shan, IBM Corporation 2016.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 */
9
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/netdevice.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16
17 #include <net/ncsi.h>
18 #include <net/net_namespace.h>
19 #include <net/sock.h>
20 #include <net/addrconf.h>
21 #include <net/ipv6.h>
22 #include <net/if_inet6.h>
23
24 #include "internal.h"
25 #include "ncsi-pkt.h"
26
27 LIST_HEAD(ncsi_dev_list);
28 DEFINE_SPINLOCK(ncsi_dev_lock);
29
30 static inline int ncsi_filter_size(int table)
31 {
32 int sizes[] = { 2, 6, 6, 6 };
33
34 BUILD_BUG_ON(ARRAY_SIZE(sizes) != NCSI_FILTER_MAX);
35 if (table < NCSI_FILTER_BASE || table >= NCSI_FILTER_MAX)
36 return -EINVAL;
37
38 return sizes[table];
39 }
40
41 u32 *ncsi_get_filter(struct ncsi_channel *nc, int table, int index)
42 {
43 struct ncsi_channel_filter *ncf;
44 int size;
45
46 ncf = nc->filters[table];
47 if (!ncf)
48 return NULL;
49
50 size = ncsi_filter_size(table);
51 if (size < 0)
52 return NULL;
53
54 return ncf->data + size * index;
55 }
56
57 /* Find the first active filter in a filter table that matches the given
58 * data parameter. If data is NULL, this returns the first active filter.
59 */
60 int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data)
61 {
62 struct ncsi_channel_filter *ncf;
63 void *bitmap;
64 int index, size;
65 unsigned long flags;
66
67 ncf = nc->filters[table];
68 if (!ncf)
69 return -ENXIO;
70
71 size = ncsi_filter_size(table);
72 if (size < 0)
73 return size;
74
75 spin_lock_irqsave(&nc->lock, flags);
76 bitmap = (void *)&ncf->bitmap;
77 index = -1;
78 while ((index = find_next_bit(bitmap, ncf->total, index + 1))
79 < ncf->total) {
80 if (!data || !memcmp(ncf->data + size * index, data, size)) {
81 spin_unlock_irqrestore(&nc->lock, flags);
82 return index;
83 }
84 }
85 spin_unlock_irqrestore(&nc->lock, flags);
86
87 return -ENOENT;
88 }
89
90 int ncsi_add_filter(struct ncsi_channel *nc, int table, void *data)
91 {
92 struct ncsi_channel_filter *ncf;
93 int index, size;
94 void *bitmap;
95 unsigned long flags;
96
97 size = ncsi_filter_size(table);
98 if (size < 0)
99 return size;
100
101 index = ncsi_find_filter(nc, table, data);
102 if (index >= 0)
103 return index;
104
105 ncf = nc->filters[table];
106 if (!ncf)
107 return -ENODEV;
108
109 spin_lock_irqsave(&nc->lock, flags);
110 bitmap = (void *)&ncf->bitmap;
111 do {
112 index = find_next_zero_bit(bitmap, ncf->total, 0);
113 if (index >= ncf->total) {
114 spin_unlock_irqrestore(&nc->lock, flags);
115 return -ENOSPC;
116 }
117 } while (test_and_set_bit(index, bitmap));
118
119 memcpy(ncf->data + size * index, data, size);
120 spin_unlock_irqrestore(&nc->lock, flags);
121
122 return index;
123 }
124
125 int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index)
126 {
127 struct ncsi_channel_filter *ncf;
128 int size;
129 void *bitmap;
130 unsigned long flags;
131
132 size = ncsi_filter_size(table);
133 if (size < 0)
134 return size;
135
136 ncf = nc->filters[table];
137 if (!ncf || index >= ncf->total)
138 return -ENODEV;
139
140 spin_lock_irqsave(&nc->lock, flags);
141 bitmap = (void *)&ncf->bitmap;
142 if (test_and_clear_bit(index, bitmap))
143 memset(ncf->data + size * index, 0, size);
144 spin_unlock_irqrestore(&nc->lock, flags);
145
146 return 0;
147 }
148
149 static void ncsi_report_link(struct ncsi_dev_priv *ndp, bool force_down)
150 {
151 struct ncsi_dev *nd = &ndp->ndev;
152 struct ncsi_package *np;
153 struct ncsi_channel *nc;
154 unsigned long flags;
155
156 nd->state = ncsi_dev_state_functional;
157 if (force_down) {
158 nd->link_up = 0;
159 goto report;
160 }
161
162 nd->link_up = 0;
163 NCSI_FOR_EACH_PACKAGE(ndp, np) {
164 NCSI_FOR_EACH_CHANNEL(np, nc) {
165 spin_lock_irqsave(&nc->lock, flags);
166
167 if (!list_empty(&nc->link) ||
168 nc->state != NCSI_CHANNEL_ACTIVE) {
169 spin_unlock_irqrestore(&nc->lock, flags);
170 continue;
171 }
172
173 if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
174 spin_unlock_irqrestore(&nc->lock, flags);
175 nd->link_up = 1;
176 goto report;
177 }
178
179 spin_unlock_irqrestore(&nc->lock, flags);
180 }
181 }
182
183 report:
184 nd->handler(nd);
185 }
186
187 static void ncsi_channel_monitor(unsigned long data)
188 {
189 struct ncsi_channel *nc = (struct ncsi_channel *)data;
190 struct ncsi_package *np = nc->package;
191 struct ncsi_dev_priv *ndp = np->ndp;
192 struct ncsi_channel_mode *ncm;
193 struct ncsi_cmd_arg nca;
194 bool enabled, chained;
195 unsigned int monitor_state;
196 unsigned long flags;
197 int state, ret;
198
199 spin_lock_irqsave(&nc->lock, flags);
200 state = nc->state;
201 chained = !list_empty(&nc->link);
202 enabled = nc->monitor.enabled;
203 monitor_state = nc->monitor.state;
204 spin_unlock_irqrestore(&nc->lock, flags);
205
206 if (!enabled || chained) {
207 ncsi_stop_channel_monitor(nc);
208 return;
209 }
210 if (state != NCSI_CHANNEL_INACTIVE &&
211 state != NCSI_CHANNEL_ACTIVE) {
212 ncsi_stop_channel_monitor(nc);
213 return;
214 }
215
216 switch (monitor_state) {
217 case NCSI_CHANNEL_MONITOR_START:
218 case NCSI_CHANNEL_MONITOR_RETRY:
219 nca.ndp = ndp;
220 nca.package = np->id;
221 nca.channel = nc->id;
222 nca.type = NCSI_PKT_CMD_GLS;
223 nca.req_flags = 0;
224 ret = ncsi_xmit_cmd(&nca);
225 if (ret)
226 netdev_err(ndp->ndev.dev, "Error %d sending GLS\n",
227 ret);
228 break;
229 case NCSI_CHANNEL_MONITOR_WAIT ... NCSI_CHANNEL_MONITOR_WAIT_MAX:
230 break;
231 default:
232 if (!(ndp->flags & NCSI_DEV_HWA)) {
233 ncsi_report_link(ndp, true);
234 ndp->flags |= NCSI_DEV_RESHUFFLE;
235 }
236
237 ncsi_stop_channel_monitor(nc);
238
239 ncm = &nc->modes[NCSI_MODE_LINK];
240 spin_lock_irqsave(&nc->lock, flags);
241 nc->state = NCSI_CHANNEL_INVISIBLE;
242 ncm->data[2] &= ~0x1;
243 spin_unlock_irqrestore(&nc->lock, flags);
244
245 spin_lock_irqsave(&ndp->lock, flags);
246 nc->state = NCSI_CHANNEL_ACTIVE;
247 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
248 spin_unlock_irqrestore(&ndp->lock, flags);
249 ncsi_process_next_channel(ndp);
250 return;
251 }
252
253 spin_lock_irqsave(&nc->lock, flags);
254 nc->monitor.state++;
255 spin_unlock_irqrestore(&nc->lock, flags);
256 mod_timer(&nc->monitor.timer, jiffies + HZ);
257 }
258
259 void ncsi_start_channel_monitor(struct ncsi_channel *nc)
260 {
261 unsigned long flags;
262
263 spin_lock_irqsave(&nc->lock, flags);
264 WARN_ON_ONCE(nc->monitor.enabled);
265 nc->monitor.enabled = true;
266 nc->monitor.state = NCSI_CHANNEL_MONITOR_START;
267 spin_unlock_irqrestore(&nc->lock, flags);
268
269 mod_timer(&nc->monitor.timer, jiffies + HZ);
270 }
271
272 void ncsi_stop_channel_monitor(struct ncsi_channel *nc)
273 {
274 unsigned long flags;
275
276 spin_lock_irqsave(&nc->lock, flags);
277 if (!nc->monitor.enabled) {
278 spin_unlock_irqrestore(&nc->lock, flags);
279 return;
280 }
281 nc->monitor.enabled = false;
282 spin_unlock_irqrestore(&nc->lock, flags);
283
284 del_timer_sync(&nc->monitor.timer);
285 }
286
287 struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
288 unsigned char id)
289 {
290 struct ncsi_channel *nc;
291
292 NCSI_FOR_EACH_CHANNEL(np, nc) {
293 if (nc->id == id)
294 return nc;
295 }
296
297 return NULL;
298 }
299
300 struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
301 {
302 struct ncsi_channel *nc, *tmp;
303 int index;
304 unsigned long flags;
305
306 nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
307 if (!nc)
308 return NULL;
309
310 nc->id = id;
311 nc->package = np;
312 nc->state = NCSI_CHANNEL_INACTIVE;
313 nc->monitor.enabled = false;
314 setup_timer(&nc->monitor.timer,
315 ncsi_channel_monitor, (unsigned long)nc);
316 spin_lock_init(&nc->lock);
317 INIT_LIST_HEAD(&nc->link);
318 for (index = 0; index < NCSI_CAP_MAX; index++)
319 nc->caps[index].index = index;
320 for (index = 0; index < NCSI_MODE_MAX; index++)
321 nc->modes[index].index = index;
322
323 spin_lock_irqsave(&np->lock, flags);
324 tmp = ncsi_find_channel(np, id);
325 if (tmp) {
326 spin_unlock_irqrestore(&np->lock, flags);
327 kfree(nc);
328 return tmp;
329 }
330
331 list_add_tail_rcu(&nc->node, &np->channels);
332 np->channel_num++;
333 spin_unlock_irqrestore(&np->lock, flags);
334
335 return nc;
336 }
337
338 static void ncsi_remove_channel(struct ncsi_channel *nc)
339 {
340 struct ncsi_package *np = nc->package;
341 struct ncsi_channel_filter *ncf;
342 unsigned long flags;
343 int i;
344
345 /* Release filters */
346 spin_lock_irqsave(&nc->lock, flags);
347 for (i = 0; i < NCSI_FILTER_MAX; i++) {
348 ncf = nc->filters[i];
349 if (!ncf)
350 continue;
351
352 nc->filters[i] = NULL;
353 kfree(ncf);
354 }
355
356 nc->state = NCSI_CHANNEL_INACTIVE;
357 spin_unlock_irqrestore(&nc->lock, flags);
358 ncsi_stop_channel_monitor(nc);
359
360 /* Remove and free channel */
361 spin_lock_irqsave(&np->lock, flags);
362 list_del_rcu(&nc->node);
363 np->channel_num--;
364 spin_unlock_irqrestore(&np->lock, flags);
365
366 kfree(nc);
367 }
368
369 struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
370 unsigned char id)
371 {
372 struct ncsi_package *np;
373
374 NCSI_FOR_EACH_PACKAGE(ndp, np) {
375 if (np->id == id)
376 return np;
377 }
378
379 return NULL;
380 }
381
382 struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
383 unsigned char id)
384 {
385 struct ncsi_package *np, *tmp;
386 unsigned long flags;
387
388 np = kzalloc(sizeof(*np), GFP_ATOMIC);
389 if (!np)
390 return NULL;
391
392 np->id = id;
393 np->ndp = ndp;
394 spin_lock_init(&np->lock);
395 INIT_LIST_HEAD(&np->channels);
396
397 spin_lock_irqsave(&ndp->lock, flags);
398 tmp = ncsi_find_package(ndp, id);
399 if (tmp) {
400 spin_unlock_irqrestore(&ndp->lock, flags);
401 kfree(np);
402 return tmp;
403 }
404
405 list_add_tail_rcu(&np->node, &ndp->packages);
406 ndp->package_num++;
407 spin_unlock_irqrestore(&ndp->lock, flags);
408
409 return np;
410 }
411
412 void ncsi_remove_package(struct ncsi_package *np)
413 {
414 struct ncsi_dev_priv *ndp = np->ndp;
415 struct ncsi_channel *nc, *tmp;
416 unsigned long flags;
417
418 /* Release all child channels */
419 list_for_each_entry_safe(nc, tmp, &np->channels, node)
420 ncsi_remove_channel(nc);
421
422 /* Remove and free package */
423 spin_lock_irqsave(&ndp->lock, flags);
424 list_del_rcu(&np->node);
425 ndp->package_num--;
426 spin_unlock_irqrestore(&ndp->lock, flags);
427
428 kfree(np);
429 }
430
431 void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
432 unsigned char id,
433 struct ncsi_package **np,
434 struct ncsi_channel **nc)
435 {
436 struct ncsi_package *p;
437 struct ncsi_channel *c;
438
439 p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
440 c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;
441
442 if (np)
443 *np = p;
444 if (nc)
445 *nc = c;
446 }
447
448 /* For two consecutive NCSI commands, the packet IDs shouldn't
449 * be same. Otherwise, the bogus response might be replied. So
450 * the available IDs are allocated in round-robin fashion.
451 */
452 struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp,
453 unsigned int req_flags)
454 {
455 struct ncsi_request *nr = NULL;
456 int i, limit = ARRAY_SIZE(ndp->requests);
457 unsigned long flags;
458
459 /* Check if there is one available request until the ceiling */
460 spin_lock_irqsave(&ndp->lock, flags);
461 for (i = ndp->request_id; i < limit; i++) {
462 if (ndp->requests[i].used)
463 continue;
464
465 nr = &ndp->requests[i];
466 nr->used = true;
467 nr->flags = req_flags;
468 ndp->request_id = i + 1;
469 goto found;
470 }
471
472 /* Fail back to check from the starting cursor */
473 for (i = NCSI_REQ_START_IDX; i < ndp->request_id; i++) {
474 if (ndp->requests[i].used)
475 continue;
476
477 nr = &ndp->requests[i];
478 nr->used = true;
479 nr->flags = req_flags;
480 ndp->request_id = i + 1;
481 goto found;
482 }
483
484 found:
485 spin_unlock_irqrestore(&ndp->lock, flags);
486 return nr;
487 }
488
489 void ncsi_free_request(struct ncsi_request *nr)
490 {
491 struct ncsi_dev_priv *ndp = nr->ndp;
492 struct sk_buff *cmd, *rsp;
493 unsigned long flags;
494 bool driven;
495
496 if (nr->enabled) {
497 nr->enabled = false;
498 del_timer_sync(&nr->timer);
499 }
500
501 spin_lock_irqsave(&ndp->lock, flags);
502 cmd = nr->cmd;
503 rsp = nr->rsp;
504 nr->cmd = NULL;
505 nr->rsp = NULL;
506 nr->used = false;
507 driven = !!(nr->flags & NCSI_REQ_FLAG_EVENT_DRIVEN);
508 spin_unlock_irqrestore(&ndp->lock, flags);
509
510 if (driven && cmd && --ndp->pending_req_num == 0)
511 schedule_work(&ndp->work);
512
513 /* Release command and response */
514 consume_skb(cmd);
515 consume_skb(rsp);
516 }
517
518 struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
519 {
520 struct ncsi_dev_priv *ndp;
521
522 NCSI_FOR_EACH_DEV(ndp) {
523 if (ndp->ndev.dev == dev)
524 return &ndp->ndev;
525 }
526
527 return NULL;
528 }
529
530 static void ncsi_request_timeout(unsigned long data)
531 {
532 struct ncsi_request *nr = (struct ncsi_request *)data;
533 struct ncsi_dev_priv *ndp = nr->ndp;
534 unsigned long flags;
535
536 /* If the request already had associated response,
537 * let the response handler to release it.
538 */
539 spin_lock_irqsave(&ndp->lock, flags);
540 nr->enabled = false;
541 if (nr->rsp || !nr->cmd) {
542 spin_unlock_irqrestore(&ndp->lock, flags);
543 return;
544 }
545 spin_unlock_irqrestore(&ndp->lock, flags);
546
547 /* Release the request */
548 ncsi_free_request(nr);
549 }
550
551 static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
552 {
553 struct ncsi_dev *nd = &ndp->ndev;
554 struct ncsi_package *np = ndp->active_package;
555 struct ncsi_channel *nc = ndp->active_channel;
556 struct ncsi_cmd_arg nca;
557 unsigned long flags;
558 int ret;
559
560 nca.ndp = ndp;
561 nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
562 switch (nd->state) {
563 case ncsi_dev_state_suspend:
564 nd->state = ncsi_dev_state_suspend_select;
565 /* Fall through */
566 case ncsi_dev_state_suspend_select:
567 ndp->pending_req_num = 1;
568
569 nca.type = NCSI_PKT_CMD_SP;
570 nca.package = np->id;
571 nca.channel = NCSI_RESERVED_CHANNEL;
572 if (ndp->flags & NCSI_DEV_HWA)
573 nca.bytes[0] = 0;
574 else
575 nca.bytes[0] = 1;
576
577 /* To retrieve the last link states of channels in current
578 * package when current active channel needs fail over to
579 * another one. It means we will possibly select another
580 * channel as next active one. The link states of channels
581 * are most important factor of the selection. So we need
582 * accurate link states. Unfortunately, the link states on
583 * inactive channels can't be updated with LSC AEN in time.
584 */
585 if (ndp->flags & NCSI_DEV_RESHUFFLE)
586 nd->state = ncsi_dev_state_suspend_gls;
587 else
588 nd->state = ncsi_dev_state_suspend_dcnt;
589 ret = ncsi_xmit_cmd(&nca);
590 if (ret)
591 goto error;
592
593 break;
594 case ncsi_dev_state_suspend_gls:
595 ndp->pending_req_num = np->channel_num;
596
597 nca.type = NCSI_PKT_CMD_GLS;
598 nca.package = np->id;
599
600 nd->state = ncsi_dev_state_suspend_dcnt;
601 NCSI_FOR_EACH_CHANNEL(np, nc) {
602 nca.channel = nc->id;
603 ret = ncsi_xmit_cmd(&nca);
604 if (ret)
605 goto error;
606 }
607
608 break;
609 case ncsi_dev_state_suspend_dcnt:
610 ndp->pending_req_num = 1;
611
612 nca.type = NCSI_PKT_CMD_DCNT;
613 nca.package = np->id;
614 nca.channel = nc->id;
615
616 nd->state = ncsi_dev_state_suspend_dc;
617 ret = ncsi_xmit_cmd(&nca);
618 if (ret)
619 goto error;
620
621 break;
622 case ncsi_dev_state_suspend_dc:
623 ndp->pending_req_num = 1;
624
625 nca.type = NCSI_PKT_CMD_DC;
626 nca.package = np->id;
627 nca.channel = nc->id;
628 nca.bytes[0] = 1;
629
630 nd->state = ncsi_dev_state_suspend_deselect;
631 ret = ncsi_xmit_cmd(&nca);
632 if (ret)
633 goto error;
634
635 break;
636 case ncsi_dev_state_suspend_deselect:
637 ndp->pending_req_num = 1;
638
639 nca.type = NCSI_PKT_CMD_DP;
640 nca.package = np->id;
641 nca.channel = NCSI_RESERVED_CHANNEL;
642
643 nd->state = ncsi_dev_state_suspend_done;
644 ret = ncsi_xmit_cmd(&nca);
645 if (ret)
646 goto error;
647
648 break;
649 case ncsi_dev_state_suspend_done:
650 spin_lock_irqsave(&nc->lock, flags);
651 nc->state = NCSI_CHANNEL_INACTIVE;
652 spin_unlock_irqrestore(&nc->lock, flags);
653 ncsi_process_next_channel(ndp);
654
655 break;
656 default:
657 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in suspend\n",
658 nd->state);
659 }
660
661 return;
662 error:
663 nd->state = ncsi_dev_state_functional;
664 }
665
666 /* Check the VLAN filter bitmap for a set filter, and construct a
667 * "Set VLAN Filter - Disable" packet if found.
668 */
669 static int clear_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
670 struct ncsi_cmd_arg *nca)
671 {
672 int index;
673 u32 *data;
674 u16 vid;
675
676 index = ncsi_find_filter(nc, NCSI_FILTER_VLAN, NULL);
677 if (index < 0) {
678 /* Filter table empty */
679 return -1;
680 }
681
682 data = ncsi_get_filter(nc, NCSI_FILTER_VLAN, index);
683 if (!data) {
684 netdev_err(ndp->ndev.dev,
685 "ncsi: failed to retrieve filter %d\n", index);
686 /* Set the VLAN id to 0 - this will still disable the entry in
687 * the filter table, but we won't know what it was.
688 */
689 vid = 0;
690 } else {
691 vid = *(u16 *)data;
692 }
693
694 netdev_printk(KERN_DEBUG, ndp->ndev.dev,
695 "ncsi: removed vlan tag %u at index %d\n",
696 vid, index + 1);
697 ncsi_remove_filter(nc, NCSI_FILTER_VLAN, index);
698
699 nca->type = NCSI_PKT_CMD_SVF;
700 nca->words[1] = vid;
701 /* HW filter index starts at 1 */
702 nca->bytes[6] = index + 1;
703 nca->bytes[7] = 0x00;
704 return 0;
705 }
706
707 /* Find an outstanding VLAN tag and constuct a "Set VLAN Filter - Enable"
708 * packet.
709 */
710 static int set_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
711 struct ncsi_cmd_arg *nca)
712 {
713 struct vlan_vid *vlan = NULL;
714 int index = 0;
715
716 list_for_each_entry_rcu(vlan, &ndp->vlan_vids, list) {
717 index = ncsi_find_filter(nc, NCSI_FILTER_VLAN, &vlan->vid);
718 if (index < 0) {
719 /* New tag to add */
720 netdev_printk(KERN_DEBUG, ndp->ndev.dev,
721 "ncsi: new vlan id to set: %u\n",
722 vlan->vid);
723 break;
724 }
725 netdev_printk(KERN_DEBUG, ndp->ndev.dev,
726 "vid %u already at filter pos %d\n",
727 vlan->vid, index);
728 }
729
730 if (!vlan || index >= 0) {
731 netdev_printk(KERN_DEBUG, ndp->ndev.dev,
732 "no vlan ids left to set\n");
733 return -1;
734 }
735
736 index = ncsi_add_filter(nc, NCSI_FILTER_VLAN, &vlan->vid);
737 if (index < 0) {
738 netdev_err(ndp->ndev.dev,
739 "Failed to add new VLAN tag, error %d\n", index);
740 if (index == -ENOSPC)
741 netdev_err(ndp->ndev.dev,
742 "Channel %u already has all VLAN filters set\n",
743 nc->id);
744 return -1;
745 }
746
747 netdev_printk(KERN_DEBUG, ndp->ndev.dev,
748 "ncsi: set vid %u in packet, index %u\n",
749 vlan->vid, index + 1);
750 nca->type = NCSI_PKT_CMD_SVF;
751 nca->words[1] = vlan->vid;
752 /* HW filter index starts at 1 */
753 nca->bytes[6] = index + 1;
754 nca->bytes[7] = 0x01;
755
756 return 0;
757 }
758
759 static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
760 {
761 struct ncsi_dev *nd = &ndp->ndev;
762 struct net_device *dev = nd->dev;
763 struct ncsi_package *np = ndp->active_package;
764 struct ncsi_channel *nc = ndp->active_channel;
765 struct ncsi_channel *hot_nc = NULL;
766 struct ncsi_cmd_arg nca;
767 unsigned char index;
768 unsigned long flags;
769 int ret;
770
771 nca.ndp = ndp;
772 nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
773 switch (nd->state) {
774 case ncsi_dev_state_config:
775 case ncsi_dev_state_config_sp:
776 ndp->pending_req_num = 1;
777
778 /* Select the specific package */
779 nca.type = NCSI_PKT_CMD_SP;
780 if (ndp->flags & NCSI_DEV_HWA)
781 nca.bytes[0] = 0;
782 else
783 nca.bytes[0] = 1;
784 nca.package = np->id;
785 nca.channel = NCSI_RESERVED_CHANNEL;
786 ret = ncsi_xmit_cmd(&nca);
787 if (ret)
788 goto error;
789
790 nd->state = ncsi_dev_state_config_cis;
791 break;
792 case ncsi_dev_state_config_cis:
793 ndp->pending_req_num = 1;
794
795 /* Clear initial state */
796 nca.type = NCSI_PKT_CMD_CIS;
797 nca.package = np->id;
798 nca.channel = nc->id;
799 ret = ncsi_xmit_cmd(&nca);
800 if (ret)
801 goto error;
802
803 nd->state = ncsi_dev_state_config_clear_vids;
804 break;
805 case ncsi_dev_state_config_clear_vids:
806 case ncsi_dev_state_config_svf:
807 case ncsi_dev_state_config_ev:
808 case ncsi_dev_state_config_sma:
809 case ncsi_dev_state_config_ebf:
810 #if IS_ENABLED(CONFIG_IPV6)
811 case ncsi_dev_state_config_egmf:
812 #endif
813 case ncsi_dev_state_config_ecnt:
814 case ncsi_dev_state_config_ec:
815 case ncsi_dev_state_config_ae:
816 case ncsi_dev_state_config_gls:
817 ndp->pending_req_num = 1;
818
819 nca.package = np->id;
820 nca.channel = nc->id;
821
822 /* Clear any active filters on the channel before setting */
823 if (nd->state == ncsi_dev_state_config_clear_vids) {
824 ret = clear_one_vid(ndp, nc, &nca);
825 if (ret) {
826 nd->state = ncsi_dev_state_config_svf;
827 schedule_work(&ndp->work);
828 break;
829 }
830 /* Repeat */
831 nd->state = ncsi_dev_state_config_clear_vids;
832 /* Add known VLAN tags to the filter */
833 } else if (nd->state == ncsi_dev_state_config_svf) {
834 ret = set_one_vid(ndp, nc, &nca);
835 if (ret) {
836 nd->state = ncsi_dev_state_config_ev;
837 schedule_work(&ndp->work);
838 break;
839 }
840 /* Repeat */
841 nd->state = ncsi_dev_state_config_svf;
842 /* Enable/Disable the VLAN filter */
843 } else if (nd->state == ncsi_dev_state_config_ev) {
844 if (list_empty(&ndp->vlan_vids)) {
845 nca.type = NCSI_PKT_CMD_DV;
846 } else {
847 nca.type = NCSI_PKT_CMD_EV;
848 nca.bytes[3] = NCSI_CAP_VLAN_NO;
849 }
850 nd->state = ncsi_dev_state_config_sma;
851 } else if (nd->state == ncsi_dev_state_config_sma) {
852 /* Use first entry in unicast filter table. Note that
853 * the MAC filter table starts from entry 1 instead of
854 * 0.
855 */
856 nca.type = NCSI_PKT_CMD_SMA;
857 for (index = 0; index < 6; index++)
858 nca.bytes[index] = dev->dev_addr[index];
859 nca.bytes[6] = 0x1;
860 nca.bytes[7] = 0x1;
861 nd->state = ncsi_dev_state_config_ebf;
862 } else if (nd->state == ncsi_dev_state_config_ebf) {
863 nca.type = NCSI_PKT_CMD_EBF;
864 nca.dwords[0] = nc->caps[NCSI_CAP_BC].cap;
865 nd->state = ncsi_dev_state_config_ecnt;
866 #if IS_ENABLED(CONFIG_IPV6)
867 if (ndp->inet6_addr_num > 0 &&
868 (nc->caps[NCSI_CAP_GENERIC].cap &
869 NCSI_CAP_GENERIC_MC))
870 nd->state = ncsi_dev_state_config_egmf;
871 else
872 nd->state = ncsi_dev_state_config_ecnt;
873 } else if (nd->state == ncsi_dev_state_config_egmf) {
874 nca.type = NCSI_PKT_CMD_EGMF;
875 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
876 nd->state = ncsi_dev_state_config_ecnt;
877 #endif /* CONFIG_IPV6 */
878 } else if (nd->state == ncsi_dev_state_config_ecnt) {
879 nca.type = NCSI_PKT_CMD_ECNT;
880 nd->state = ncsi_dev_state_config_ec;
881 } else if (nd->state == ncsi_dev_state_config_ec) {
882 /* Enable AEN if it's supported */
883 nca.type = NCSI_PKT_CMD_EC;
884 nd->state = ncsi_dev_state_config_ae;
885 if (!(nc->caps[NCSI_CAP_AEN].cap & NCSI_CAP_AEN_MASK))
886 nd->state = ncsi_dev_state_config_gls;
887 } else if (nd->state == ncsi_dev_state_config_ae) {
888 nca.type = NCSI_PKT_CMD_AE;
889 nca.bytes[0] = 0;
890 nca.dwords[1] = nc->caps[NCSI_CAP_AEN].cap;
891 nd->state = ncsi_dev_state_config_gls;
892 } else if (nd->state == ncsi_dev_state_config_gls) {
893 nca.type = NCSI_PKT_CMD_GLS;
894 nd->state = ncsi_dev_state_config_done;
895 }
896
897 ret = ncsi_xmit_cmd(&nca);
898 if (ret)
899 goto error;
900 break;
901 case ncsi_dev_state_config_done:
902 spin_lock_irqsave(&nc->lock, flags);
903 if (nc->reconfigure_needed) {
904 /* This channel's configuration has been updated
905 * part-way during the config state - start the
906 * channel configuration over
907 */
908 nc->reconfigure_needed = false;
909 nc->state = NCSI_CHANNEL_INACTIVE;
910 spin_unlock_irqrestore(&nc->lock, flags);
911
912 spin_lock_irqsave(&ndp->lock, flags);
913 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
914 spin_unlock_irqrestore(&ndp->lock, flags);
915
916 netdev_printk(KERN_DEBUG, dev,
917 "Dirty NCSI channel state reset\n");
918 ncsi_process_next_channel(ndp);
919 break;
920 }
921
922 if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
923 hot_nc = nc;
924 nc->state = NCSI_CHANNEL_ACTIVE;
925 } else {
926 hot_nc = NULL;
927 nc->state = NCSI_CHANNEL_INACTIVE;
928 }
929 spin_unlock_irqrestore(&nc->lock, flags);
930
931 /* Update the hot channel */
932 spin_lock_irqsave(&ndp->lock, flags);
933 ndp->hot_channel = hot_nc;
934 spin_unlock_irqrestore(&ndp->lock, flags);
935
936 ncsi_start_channel_monitor(nc);
937 ncsi_process_next_channel(ndp);
938 break;
939 default:
940 netdev_warn(dev, "Wrong NCSI state 0x%x in config\n",
941 nd->state);
942 }
943
944 return;
945
946 error:
947 ncsi_report_link(ndp, true);
948 }
949
950 static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
951 {
952 struct ncsi_package *np;
953 struct ncsi_channel *nc, *found, *hot_nc;
954 struct ncsi_channel_mode *ncm;
955 unsigned long flags;
956
957 spin_lock_irqsave(&ndp->lock, flags);
958 hot_nc = ndp->hot_channel;
959 spin_unlock_irqrestore(&ndp->lock, flags);
960
961 /* The search is done once an inactive channel with up
962 * link is found.
963 */
964 found = NULL;
965 NCSI_FOR_EACH_PACKAGE(ndp, np) {
966 NCSI_FOR_EACH_CHANNEL(np, nc) {
967 spin_lock_irqsave(&nc->lock, flags);
968
969 if (!list_empty(&nc->link) ||
970 nc->state != NCSI_CHANNEL_INACTIVE) {
971 spin_unlock_irqrestore(&nc->lock, flags);
972 continue;
973 }
974
975 if (!found)
976 found = nc;
977
978 if (nc == hot_nc)
979 found = nc;
980
981 ncm = &nc->modes[NCSI_MODE_LINK];
982 if (ncm->data[2] & 0x1) {
983 spin_unlock_irqrestore(&nc->lock, flags);
984 found = nc;
985 goto out;
986 }
987
988 spin_unlock_irqrestore(&nc->lock, flags);
989 }
990 }
991
992 if (!found) {
993 ncsi_report_link(ndp, true);
994 return -ENODEV;
995 }
996
997 out:
998 spin_lock_irqsave(&ndp->lock, flags);
999 list_add_tail_rcu(&found->link, &ndp->channel_queue);
1000 spin_unlock_irqrestore(&ndp->lock, flags);
1001
1002 return ncsi_process_next_channel(ndp);
1003 }
1004
1005 static bool ncsi_check_hwa(struct ncsi_dev_priv *ndp)
1006 {
1007 struct ncsi_package *np;
1008 struct ncsi_channel *nc;
1009 unsigned int cap;
1010 bool has_channel = false;
1011
1012 /* The hardware arbitration is disabled if any one channel
1013 * doesn't support explicitly.
1014 */
1015 NCSI_FOR_EACH_PACKAGE(ndp, np) {
1016 NCSI_FOR_EACH_CHANNEL(np, nc) {
1017 has_channel = true;
1018
1019 cap = nc->caps[NCSI_CAP_GENERIC].cap;
1020 if (!(cap & NCSI_CAP_GENERIC_HWA) ||
1021 (cap & NCSI_CAP_GENERIC_HWA_MASK) !=
1022 NCSI_CAP_GENERIC_HWA_SUPPORT) {
1023 ndp->flags &= ~NCSI_DEV_HWA;
1024 return false;
1025 }
1026 }
1027 }
1028
1029 if (has_channel) {
1030 ndp->flags |= NCSI_DEV_HWA;
1031 return true;
1032 }
1033
1034 ndp->flags &= ~NCSI_DEV_HWA;
1035 return false;
1036 }
1037
1038 static int ncsi_enable_hwa(struct ncsi_dev_priv *ndp)
1039 {
1040 struct ncsi_package *np;
1041 struct ncsi_channel *nc;
1042 unsigned long flags;
1043
1044 /* Move all available channels to processing queue */
1045 spin_lock_irqsave(&ndp->lock, flags);
1046 NCSI_FOR_EACH_PACKAGE(ndp, np) {
1047 NCSI_FOR_EACH_CHANNEL(np, nc) {
1048 WARN_ON_ONCE(nc->state != NCSI_CHANNEL_INACTIVE ||
1049 !list_empty(&nc->link));
1050 ncsi_stop_channel_monitor(nc);
1051 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
1052 }
1053 }
1054 spin_unlock_irqrestore(&ndp->lock, flags);
1055
1056 /* We can have no channels in extremely case */
1057 if (list_empty(&ndp->channel_queue)) {
1058 ncsi_report_link(ndp, false);
1059 return -ENOENT;
1060 }
1061
1062 return ncsi_process_next_channel(ndp);
1063 }
1064
1065 static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
1066 {
1067 struct ncsi_dev *nd = &ndp->ndev;
1068 struct ncsi_package *np;
1069 struct ncsi_channel *nc;
1070 struct ncsi_cmd_arg nca;
1071 unsigned char index;
1072 int ret;
1073
1074 nca.ndp = ndp;
1075 nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
1076 switch (nd->state) {
1077 case ncsi_dev_state_probe:
1078 nd->state = ncsi_dev_state_probe_deselect;
1079 /* Fall through */
1080 case ncsi_dev_state_probe_deselect:
1081 ndp->pending_req_num = 8;
1082
1083 /* Deselect all possible packages */
1084 nca.type = NCSI_PKT_CMD_DP;
1085 nca.channel = NCSI_RESERVED_CHANNEL;
1086 for (index = 0; index < 8; index++) {
1087 nca.package = index;
1088 ret = ncsi_xmit_cmd(&nca);
1089 if (ret)
1090 goto error;
1091 }
1092
1093 nd->state = ncsi_dev_state_probe_package;
1094 break;
1095 case ncsi_dev_state_probe_package:
1096 ndp->pending_req_num = 16;
1097
1098 /* Select all possible packages */
1099 nca.type = NCSI_PKT_CMD_SP;
1100 nca.bytes[0] = 1;
1101 nca.channel = NCSI_RESERVED_CHANNEL;
1102 for (index = 0; index < 8; index++) {
1103 nca.package = index;
1104 ret = ncsi_xmit_cmd(&nca);
1105 if (ret)
1106 goto error;
1107 }
1108
1109 /* Disable all possible packages */
1110 nca.type = NCSI_PKT_CMD_DP;
1111 for (index = 0; index < 8; index++) {
1112 nca.package = index;
1113 ret = ncsi_xmit_cmd(&nca);
1114 if (ret)
1115 goto error;
1116 }
1117
1118 nd->state = ncsi_dev_state_probe_channel;
1119 break;
1120 case ncsi_dev_state_probe_channel:
1121 if (!ndp->active_package)
1122 ndp->active_package = list_first_or_null_rcu(
1123 &ndp->packages, struct ncsi_package, node);
1124 else if (list_is_last(&ndp->active_package->node,
1125 &ndp->packages))
1126 ndp->active_package = NULL;
1127 else
1128 ndp->active_package = list_next_entry(
1129 ndp->active_package, node);
1130
1131 /* All available packages and channels are enumerated. The
1132 * enumeration happens for once when the NCSI interface is
1133 * started. So we need continue to start the interface after
1134 * the enumeration.
1135 *
1136 * We have to choose an active channel before configuring it.
1137 * Note that we possibly don't have active channel in extreme
1138 * situation.
1139 */
1140 if (!ndp->active_package) {
1141 ndp->flags |= NCSI_DEV_PROBED;
1142 if (ncsi_check_hwa(ndp))
1143 ncsi_enable_hwa(ndp);
1144 else
1145 ncsi_choose_active_channel(ndp);
1146 return;
1147 }
1148
1149 /* Select the active package */
1150 ndp->pending_req_num = 1;
1151 nca.type = NCSI_PKT_CMD_SP;
1152 nca.bytes[0] = 1;
1153 nca.package = ndp->active_package->id;
1154 nca.channel = NCSI_RESERVED_CHANNEL;
1155 ret = ncsi_xmit_cmd(&nca);
1156 if (ret)
1157 goto error;
1158
1159 nd->state = ncsi_dev_state_probe_cis;
1160 break;
1161 case ncsi_dev_state_probe_cis:
1162 ndp->pending_req_num = NCSI_RESERVED_CHANNEL;
1163
1164 /* Clear initial state */
1165 nca.type = NCSI_PKT_CMD_CIS;
1166 nca.package = ndp->active_package->id;
1167 for (index = 0; index < NCSI_RESERVED_CHANNEL; index++) {
1168 nca.channel = index;
1169 ret = ncsi_xmit_cmd(&nca);
1170 if (ret)
1171 goto error;
1172 }
1173
1174 nd->state = ncsi_dev_state_probe_gvi;
1175 break;
1176 case ncsi_dev_state_probe_gvi:
1177 case ncsi_dev_state_probe_gc:
1178 case ncsi_dev_state_probe_gls:
1179 np = ndp->active_package;
1180 ndp->pending_req_num = np->channel_num;
1181
1182 /* Retrieve version, capability or link status */
1183 if (nd->state == ncsi_dev_state_probe_gvi)
1184 nca.type = NCSI_PKT_CMD_GVI;
1185 else if (nd->state == ncsi_dev_state_probe_gc)
1186 nca.type = NCSI_PKT_CMD_GC;
1187 else
1188 nca.type = NCSI_PKT_CMD_GLS;
1189
1190 nca.package = np->id;
1191 NCSI_FOR_EACH_CHANNEL(np, nc) {
1192 nca.channel = nc->id;
1193 ret = ncsi_xmit_cmd(&nca);
1194 if (ret)
1195 goto error;
1196 }
1197
1198 if (nd->state == ncsi_dev_state_probe_gvi)
1199 nd->state = ncsi_dev_state_probe_gc;
1200 else if (nd->state == ncsi_dev_state_probe_gc)
1201 nd->state = ncsi_dev_state_probe_gls;
1202 else
1203 nd->state = ncsi_dev_state_probe_dp;
1204 break;
1205 case ncsi_dev_state_probe_dp:
1206 ndp->pending_req_num = 1;
1207
1208 /* Deselect the active package */
1209 nca.type = NCSI_PKT_CMD_DP;
1210 nca.package = ndp->active_package->id;
1211 nca.channel = NCSI_RESERVED_CHANNEL;
1212 ret = ncsi_xmit_cmd(&nca);
1213 if (ret)
1214 goto error;
1215
1216 /* Scan channels in next package */
1217 nd->state = ncsi_dev_state_probe_channel;
1218 break;
1219 default:
1220 netdev_warn(nd->dev, "Wrong NCSI state 0x%0x in enumeration\n",
1221 nd->state);
1222 }
1223
1224 return;
1225 error:
1226 ncsi_report_link(ndp, true);
1227 }
1228
1229 static void ncsi_dev_work(struct work_struct *work)
1230 {
1231 struct ncsi_dev_priv *ndp = container_of(work,
1232 struct ncsi_dev_priv, work);
1233 struct ncsi_dev *nd = &ndp->ndev;
1234
1235 switch (nd->state & ncsi_dev_state_major) {
1236 case ncsi_dev_state_probe:
1237 ncsi_probe_channel(ndp);
1238 break;
1239 case ncsi_dev_state_suspend:
1240 ncsi_suspend_channel(ndp);
1241 break;
1242 case ncsi_dev_state_config:
1243 ncsi_configure_channel(ndp);
1244 break;
1245 default:
1246 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in workqueue\n",
1247 nd->state);
1248 }
1249 }
1250
1251 int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
1252 {
1253 struct ncsi_channel *nc;
1254 int old_state;
1255 unsigned long flags;
1256
1257 spin_lock_irqsave(&ndp->lock, flags);
1258 nc = list_first_or_null_rcu(&ndp->channel_queue,
1259 struct ncsi_channel, link);
1260 if (!nc) {
1261 spin_unlock_irqrestore(&ndp->lock, flags);
1262 goto out;
1263 }
1264
1265 list_del_init(&nc->link);
1266 spin_unlock_irqrestore(&ndp->lock, flags);
1267
1268 spin_lock_irqsave(&nc->lock, flags);
1269 old_state = nc->state;
1270 nc->state = NCSI_CHANNEL_INVISIBLE;
1271 spin_unlock_irqrestore(&nc->lock, flags);
1272
1273 ndp->active_channel = nc;
1274 ndp->active_package = nc->package;
1275
1276 switch (old_state) {
1277 case NCSI_CHANNEL_INACTIVE:
1278 ndp->ndev.state = ncsi_dev_state_config;
1279 ncsi_configure_channel(ndp);
1280 break;
1281 case NCSI_CHANNEL_ACTIVE:
1282 ndp->ndev.state = ncsi_dev_state_suspend;
1283 ncsi_suspend_channel(ndp);
1284 break;
1285 default:
1286 netdev_err(ndp->ndev.dev, "Invalid state 0x%x on %d:%d\n",
1287 old_state, nc->package->id, nc->id);
1288 ncsi_report_link(ndp, false);
1289 return -EINVAL;
1290 }
1291
1292 return 0;
1293
1294 out:
1295 ndp->active_channel = NULL;
1296 ndp->active_package = NULL;
1297 if (ndp->flags & NCSI_DEV_RESHUFFLE) {
1298 ndp->flags &= ~NCSI_DEV_RESHUFFLE;
1299 return ncsi_choose_active_channel(ndp);
1300 }
1301
1302 ncsi_report_link(ndp, false);
1303 return -ENODEV;
1304 }
1305
1306 #if IS_ENABLED(CONFIG_IPV6)
1307 static int ncsi_inet6addr_event(struct notifier_block *this,
1308 unsigned long event, void *data)
1309 {
1310 struct inet6_ifaddr *ifa = data;
1311 struct net_device *dev = ifa->idev->dev;
1312 struct ncsi_dev *nd = ncsi_find_dev(dev);
1313 struct ncsi_dev_priv *ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
1314 struct ncsi_package *np;
1315 struct ncsi_channel *nc;
1316 struct ncsi_cmd_arg nca;
1317 bool action;
1318 int ret;
1319
1320 if (!ndp || (ipv6_addr_type(&ifa->addr) &
1321 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)))
1322 return NOTIFY_OK;
1323
1324 switch (event) {
1325 case NETDEV_UP:
1326 action = (++ndp->inet6_addr_num) == 1;
1327 nca.type = NCSI_PKT_CMD_EGMF;
1328 break;
1329 case NETDEV_DOWN:
1330 action = (--ndp->inet6_addr_num == 0);
1331 nca.type = NCSI_PKT_CMD_DGMF;
1332 break;
1333 default:
1334 return NOTIFY_OK;
1335 }
1336
1337 /* We might not have active channel or packages. The IPv6
1338 * required multicast will be enabled when active channel
1339 * or packages are chosen.
1340 */
1341 np = ndp->active_package;
1342 nc = ndp->active_channel;
1343 if (!action || !np || !nc)
1344 return NOTIFY_OK;
1345
1346 /* We needn't enable or disable it if the function isn't supported */
1347 if (!(nc->caps[NCSI_CAP_GENERIC].cap & NCSI_CAP_GENERIC_MC))
1348 return NOTIFY_OK;
1349
1350 nca.ndp = ndp;
1351 nca.req_flags = 0;
1352 nca.package = np->id;
1353 nca.channel = nc->id;
1354 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
1355 ret = ncsi_xmit_cmd(&nca);
1356 if (ret) {
1357 netdev_warn(dev, "Fail to %s global multicast filter (%d)\n",
1358 (event == NETDEV_UP) ? "enable" : "disable", ret);
1359 return NOTIFY_DONE;
1360 }
1361
1362 return NOTIFY_OK;
1363 }
1364
1365 static struct notifier_block ncsi_inet6addr_notifier = {
1366 .notifier_call = ncsi_inet6addr_event,
1367 };
1368 #endif /* CONFIG_IPV6 */
1369
1370 static int ncsi_kick_channels(struct ncsi_dev_priv *ndp)
1371 {
1372 struct ncsi_dev *nd = &ndp->ndev;
1373 struct ncsi_channel *nc;
1374 struct ncsi_package *np;
1375 unsigned long flags;
1376 unsigned int n = 0;
1377
1378 NCSI_FOR_EACH_PACKAGE(ndp, np) {
1379 NCSI_FOR_EACH_CHANNEL(np, nc) {
1380 spin_lock_irqsave(&nc->lock, flags);
1381
1382 /* Channels may be busy, mark dirty instead of
1383 * kicking if;
1384 * a) not ACTIVE (configured)
1385 * b) in the channel_queue (to be configured)
1386 * c) it's ndev is in the config state
1387 */
1388 if (nc->state != NCSI_CHANNEL_ACTIVE) {
1389 if ((ndp->ndev.state & 0xff00) ==
1390 ncsi_dev_state_config ||
1391 !list_empty(&nc->link)) {
1392 netdev_printk(KERN_DEBUG, nd->dev,
1393 "ncsi: channel %p marked dirty\n",
1394 nc);
1395 nc->reconfigure_needed = true;
1396 }
1397 spin_unlock_irqrestore(&nc->lock, flags);
1398 continue;
1399 }
1400
1401 spin_unlock_irqrestore(&nc->lock, flags);
1402
1403 ncsi_stop_channel_monitor(nc);
1404 spin_lock_irqsave(&nc->lock, flags);
1405 nc->state = NCSI_CHANNEL_INACTIVE;
1406 spin_unlock_irqrestore(&nc->lock, flags);
1407
1408 spin_lock_irqsave(&ndp->lock, flags);
1409 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
1410 spin_unlock_irqrestore(&ndp->lock, flags);
1411
1412 netdev_printk(KERN_DEBUG, nd->dev,
1413 "ncsi: kicked channel %p\n", nc);
1414 n++;
1415 }
1416 }
1417
1418 return n;
1419 }
1420
1421 int ncsi_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
1422 {
1423 struct ncsi_dev_priv *ndp;
1424 unsigned int n_vids = 0;
1425 struct vlan_vid *vlan;
1426 struct ncsi_dev *nd;
1427 bool found = false;
1428
1429 if (vid == 0)
1430 return 0;
1431
1432 nd = ncsi_find_dev(dev);
1433 if (!nd) {
1434 netdev_warn(dev, "ncsi: No net_device?\n");
1435 return 0;
1436 }
1437
1438 ndp = TO_NCSI_DEV_PRIV(nd);
1439
1440 /* Add the VLAN id to our internal list */
1441 list_for_each_entry_rcu(vlan, &ndp->vlan_vids, list) {
1442 n_vids++;
1443 if (vlan->vid == vid) {
1444 netdev_printk(KERN_DEBUG, dev,
1445 "vid %u already registered\n", vid);
1446 return 0;
1447 }
1448 }
1449 if (n_vids >= NCSI_MAX_VLAN_VIDS) {
1450 netdev_warn(dev,
1451 "tried to add vlan id %u but NCSI max already registered (%u)\n",
1452 vid, NCSI_MAX_VLAN_VIDS);
1453 return -ENOSPC;
1454 }
1455
1456 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1457 if (!vlan)
1458 return -ENOMEM;
1459
1460 vlan->proto = proto;
1461 vlan->vid = vid;
1462 list_add_rcu(&vlan->list, &ndp->vlan_vids);
1463
1464 netdev_printk(KERN_DEBUG, dev, "Added new vid %u\n", vid);
1465
1466 found = ncsi_kick_channels(ndp) != 0;
1467
1468 return found ? ncsi_process_next_channel(ndp) : 0;
1469 }
1470 EXPORT_SYMBOL_GPL(ncsi_vlan_rx_add_vid);
1471
1472 int ncsi_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
1473 {
1474 struct vlan_vid *vlan, *tmp;
1475 struct ncsi_dev_priv *ndp;
1476 struct ncsi_dev *nd;
1477 bool found = false;
1478
1479 if (vid == 0)
1480 return 0;
1481
1482 nd = ncsi_find_dev(dev);
1483 if (!nd) {
1484 netdev_warn(dev, "ncsi: no net_device?\n");
1485 return 0;
1486 }
1487
1488 ndp = TO_NCSI_DEV_PRIV(nd);
1489
1490 /* Remove the VLAN id from our internal list */
1491 list_for_each_entry_safe(vlan, tmp, &ndp->vlan_vids, list)
1492 if (vlan->vid == vid) {
1493 netdev_printk(KERN_DEBUG, dev,
1494 "vid %u found, removing\n", vid);
1495 list_del_rcu(&vlan->list);
1496 found = true;
1497 kfree(vlan);
1498 }
1499
1500 if (!found) {
1501 netdev_err(dev, "ncsi: vid %u wasn't registered!\n", vid);
1502 return -EINVAL;
1503 }
1504
1505 found = ncsi_kick_channels(ndp) != 0;
1506
1507 return found ? ncsi_process_next_channel(ndp) : 0;
1508 }
1509 EXPORT_SYMBOL_GPL(ncsi_vlan_rx_kill_vid);
1510
1511 struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
1512 void (*handler)(struct ncsi_dev *ndev))
1513 {
1514 struct ncsi_dev_priv *ndp;
1515 struct ncsi_dev *nd;
1516 unsigned long flags;
1517 int i;
1518
1519 /* Check if the device has been registered or not */
1520 nd = ncsi_find_dev(dev);
1521 if (nd)
1522 return nd;
1523
1524 /* Create NCSI device */
1525 ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
1526 if (!ndp)
1527 return NULL;
1528
1529 nd = &ndp->ndev;
1530 nd->state = ncsi_dev_state_registered;
1531 nd->dev = dev;
1532 nd->handler = handler;
1533 ndp->pending_req_num = 0;
1534 INIT_LIST_HEAD(&ndp->channel_queue);
1535 INIT_LIST_HEAD(&ndp->vlan_vids);
1536 INIT_WORK(&ndp->work, ncsi_dev_work);
1537
1538 /* Initialize private NCSI device */
1539 spin_lock_init(&ndp->lock);
1540 INIT_LIST_HEAD(&ndp->packages);
1541 ndp->request_id = NCSI_REQ_START_IDX;
1542 for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
1543 ndp->requests[i].id = i;
1544 ndp->requests[i].ndp = ndp;
1545 setup_timer(&ndp->requests[i].timer,
1546 ncsi_request_timeout,
1547 (unsigned long)&ndp->requests[i]);
1548 }
1549
1550 spin_lock_irqsave(&ncsi_dev_lock, flags);
1551 #if IS_ENABLED(CONFIG_IPV6)
1552 ndp->inet6_addr_num = 0;
1553 if (list_empty(&ncsi_dev_list))
1554 register_inet6addr_notifier(&ncsi_inet6addr_notifier);
1555 #endif
1556 list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
1557 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1558
1559 /* Register NCSI packet Rx handler */
1560 ndp->ptype.type = cpu_to_be16(ETH_P_NCSI);
1561 ndp->ptype.func = ncsi_rcv_rsp;
1562 ndp->ptype.dev = dev;
1563 dev_add_pack(&ndp->ptype);
1564
1565 return nd;
1566 }
1567 EXPORT_SYMBOL_GPL(ncsi_register_dev);
1568
1569 int ncsi_start_dev(struct ncsi_dev *nd)
1570 {
1571 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1572 int ret;
1573
1574 if (nd->state != ncsi_dev_state_registered &&
1575 nd->state != ncsi_dev_state_functional)
1576 return -ENOTTY;
1577
1578 if (!(ndp->flags & NCSI_DEV_PROBED)) {
1579 nd->state = ncsi_dev_state_probe;
1580 schedule_work(&ndp->work);
1581 return 0;
1582 }
1583
1584 if (ndp->flags & NCSI_DEV_HWA)
1585 ret = ncsi_enable_hwa(ndp);
1586 else
1587 ret = ncsi_choose_active_channel(ndp);
1588
1589 return ret;
1590 }
1591 EXPORT_SYMBOL_GPL(ncsi_start_dev);
1592
1593 void ncsi_stop_dev(struct ncsi_dev *nd)
1594 {
1595 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1596 struct ncsi_package *np;
1597 struct ncsi_channel *nc;
1598 bool chained;
1599 int old_state;
1600 unsigned long flags;
1601
1602 /* Stop the channel monitor and reset channel's state */
1603 NCSI_FOR_EACH_PACKAGE(ndp, np) {
1604 NCSI_FOR_EACH_CHANNEL(np, nc) {
1605 ncsi_stop_channel_monitor(nc);
1606
1607 spin_lock_irqsave(&nc->lock, flags);
1608 chained = !list_empty(&nc->link);
1609 old_state = nc->state;
1610 nc->state = NCSI_CHANNEL_INACTIVE;
1611 spin_unlock_irqrestore(&nc->lock, flags);
1612
1613 WARN_ON_ONCE(chained ||
1614 old_state == NCSI_CHANNEL_INVISIBLE);
1615 }
1616 }
1617
1618 ncsi_report_link(ndp, true);
1619 }
1620 EXPORT_SYMBOL_GPL(ncsi_stop_dev);
1621
1622 void ncsi_unregister_dev(struct ncsi_dev *nd)
1623 {
1624 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1625 struct ncsi_package *np, *tmp;
1626 unsigned long flags;
1627
1628 dev_remove_pack(&ndp->ptype);
1629
1630 list_for_each_entry_safe(np, tmp, &ndp->packages, node)
1631 ncsi_remove_package(np);
1632
1633 spin_lock_irqsave(&ncsi_dev_lock, flags);
1634 list_del_rcu(&ndp->node);
1635 #if IS_ENABLED(CONFIG_IPV6)
1636 if (list_empty(&ncsi_dev_list))
1637 unregister_inet6addr_notifier(&ncsi_inet6addr_notifier);
1638 #endif
1639 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1640
1641 kfree(ndp);
1642 }
1643 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
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