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Linux 4.9.65
[linux/fpc-iii.git] / net / ncsi / ncsi-manage.c
bloba3bd5fa8ad093a3fb7533f00186111bf9a19c2ed
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 int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data)
42 {
43 struct ncsi_channel_filter *ncf;
44 void *bitmap;
45 int index, size;
46 unsigned long flags;
47
48 ncf = nc->filters[table];
49 if (!ncf)
50 return -ENXIO;
51
52 size = ncsi_filter_size(table);
53 if (size < 0)
54 return size;
55
56 spin_lock_irqsave(&nc->lock, flags);
57 bitmap = (void *)&ncf->bitmap;
58 index = -1;
59 while ((index = find_next_bit(bitmap, ncf->total, index + 1))
60 < ncf->total) {
61 if (!memcmp(ncf->data + size * index, data, size)) {
62 spin_unlock_irqrestore(&nc->lock, flags);
63 return index;
64 }
65 }
66 spin_unlock_irqrestore(&nc->lock, flags);
67
68 return -ENOENT;
69 }
70
71 int ncsi_add_filter(struct ncsi_channel *nc, int table, void *data)
72 {
73 struct ncsi_channel_filter *ncf;
74 int index, size;
75 void *bitmap;
76 unsigned long flags;
77
78 size = ncsi_filter_size(table);
79 if (size < 0)
80 return size;
81
82 index = ncsi_find_filter(nc, table, data);
83 if (index >= 0)
84 return index;
85
86 ncf = nc->filters[table];
87 if (!ncf)
88 return -ENODEV;
89
90 spin_lock_irqsave(&nc->lock, flags);
91 bitmap = (void *)&ncf->bitmap;
92 do {
93 index = find_next_zero_bit(bitmap, ncf->total, 0);
94 if (index >= ncf->total) {
95 spin_unlock_irqrestore(&nc->lock, flags);
96 return -ENOSPC;
97 }
98 } while (test_and_set_bit(index, bitmap));
99
100 memcpy(ncf->data + size * index, data, size);
101 spin_unlock_irqrestore(&nc->lock, flags);
102
103 return index;
104 }
105
106 int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index)
107 {
108 struct ncsi_channel_filter *ncf;
109 int size;
110 void *bitmap;
111 unsigned long flags;
112
113 size = ncsi_filter_size(table);
114 if (size < 0)
115 return size;
116
117 ncf = nc->filters[table];
118 if (!ncf || index >= ncf->total)
119 return -ENODEV;
120
121 spin_lock_irqsave(&nc->lock, flags);
122 bitmap = (void *)&ncf->bitmap;
123 if (test_and_clear_bit(index, bitmap))
124 memset(ncf->data + size * index, 0, size);
125 spin_unlock_irqrestore(&nc->lock, flags);
126
127 return 0;
128 }
129
130 static void ncsi_report_link(struct ncsi_dev_priv *ndp, bool force_down)
131 {
132 struct ncsi_dev *nd = &ndp->ndev;
133 struct ncsi_package *np;
134 struct ncsi_channel *nc;
135 unsigned long flags;
136
137 nd->state = ncsi_dev_state_functional;
138 if (force_down) {
139 nd->link_up = 0;
140 goto report;
141 }
142
143 nd->link_up = 0;
144 NCSI_FOR_EACH_PACKAGE(ndp, np) {
145 NCSI_FOR_EACH_CHANNEL(np, nc) {
146 spin_lock_irqsave(&nc->lock, flags);
147
148 if (!list_empty(&nc->link) ||
149 nc->state != NCSI_CHANNEL_ACTIVE) {
150 spin_unlock_irqrestore(&nc->lock, flags);
151 continue;
152 }
153
154 if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
155 spin_unlock_irqrestore(&nc->lock, flags);
156 nd->link_up = 1;
157 goto report;
158 }
159
160 spin_unlock_irqrestore(&nc->lock, flags);
161 }
162 }
163
164 report:
165 nd->handler(nd);
166 }
167
168 static void ncsi_channel_monitor(unsigned long data)
169 {
170 struct ncsi_channel *nc = (struct ncsi_channel *)data;
171 struct ncsi_package *np = nc->package;
172 struct ncsi_dev_priv *ndp = np->ndp;
173 struct ncsi_cmd_arg nca;
174 bool enabled, chained;
175 unsigned int monitor_state;
176 unsigned long flags;
177 int state, ret;
178
179 spin_lock_irqsave(&nc->lock, flags);
180 state = nc->state;
181 chained = !list_empty(&nc->link);
182 enabled = nc->monitor.enabled;
183 monitor_state = nc->monitor.state;
184 spin_unlock_irqrestore(&nc->lock, flags);
185
186 if (!enabled || chained)
187 return;
188 if (state != NCSI_CHANNEL_INACTIVE &&
189 state != NCSI_CHANNEL_ACTIVE)
190 return;
191
192 switch (monitor_state) {
193 case NCSI_CHANNEL_MONITOR_START:
194 case NCSI_CHANNEL_MONITOR_RETRY:
195 nca.ndp = ndp;
196 nca.package = np->id;
197 nca.channel = nc->id;
198 nca.type = NCSI_PKT_CMD_GLS;
199 nca.req_flags = 0;
200 ret = ncsi_xmit_cmd(&nca);
201 if (ret) {
202 netdev_err(ndp->ndev.dev, "Error %d sending GLS\n",
203 ret);
204 return;
205 }
206
207 break;
208 case NCSI_CHANNEL_MONITOR_WAIT ... NCSI_CHANNEL_MONITOR_WAIT_MAX:
209 break;
210 default:
211 if (!(ndp->flags & NCSI_DEV_HWA) &&
212 state == NCSI_CHANNEL_ACTIVE) {
213 ncsi_report_link(ndp, true);
214 ndp->flags |= NCSI_DEV_RESHUFFLE;
215 }
216
217 spin_lock_irqsave(&nc->lock, flags);
218 nc->state = NCSI_CHANNEL_INVISIBLE;
219 spin_unlock_irqrestore(&nc->lock, flags);
220
221 spin_lock_irqsave(&ndp->lock, flags);
222 nc->state = NCSI_CHANNEL_INACTIVE;
223 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
224 spin_unlock_irqrestore(&ndp->lock, flags);
225 ncsi_process_next_channel(ndp);
226 return;
227 }
228
229 spin_lock_irqsave(&nc->lock, flags);
230 nc->monitor.state++;
231 spin_unlock_irqrestore(&nc->lock, flags);
232 mod_timer(&nc->monitor.timer, jiffies + HZ);
233 }
234
235 void ncsi_start_channel_monitor(struct ncsi_channel *nc)
236 {
237 unsigned long flags;
238
239 spin_lock_irqsave(&nc->lock, flags);
240 WARN_ON_ONCE(nc->monitor.enabled);
241 nc->monitor.enabled = true;
242 nc->monitor.state = NCSI_CHANNEL_MONITOR_START;
243 spin_unlock_irqrestore(&nc->lock, flags);
244
245 mod_timer(&nc->monitor.timer, jiffies + HZ);
246 }
247
248 void ncsi_stop_channel_monitor(struct ncsi_channel *nc)
249 {
250 unsigned long flags;
251
252 spin_lock_irqsave(&nc->lock, flags);
253 if (!nc->monitor.enabled) {
254 spin_unlock_irqrestore(&nc->lock, flags);
255 return;
256 }
257 nc->monitor.enabled = false;
258 spin_unlock_irqrestore(&nc->lock, flags);
259
260 del_timer_sync(&nc->monitor.timer);
261 }
262
263 struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
264 unsigned char id)
265 {
266 struct ncsi_channel *nc;
267
268 NCSI_FOR_EACH_CHANNEL(np, nc) {
269 if (nc->id == id)
270 return nc;
271 }
272
273 return NULL;
274 }
275
276 struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
277 {
278 struct ncsi_channel *nc, *tmp;
279 int index;
280 unsigned long flags;
281
282 nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
283 if (!nc)
284 return NULL;
285
286 nc->id = id;
287 nc->package = np;
288 nc->state = NCSI_CHANNEL_INACTIVE;
289 nc->monitor.enabled = false;
290 setup_timer(&nc->monitor.timer,
291 ncsi_channel_monitor, (unsigned long)nc);
292 spin_lock_init(&nc->lock);
293 INIT_LIST_HEAD(&nc->link);
294 for (index = 0; index < NCSI_CAP_MAX; index++)
295 nc->caps[index].index = index;
296 for (index = 0; index < NCSI_MODE_MAX; index++)
297 nc->modes[index].index = index;
298
299 spin_lock_irqsave(&np->lock, flags);
300 tmp = ncsi_find_channel(np, id);
301 if (tmp) {
302 spin_unlock_irqrestore(&np->lock, flags);
303 kfree(nc);
304 return tmp;
305 }
306
307 list_add_tail_rcu(&nc->node, &np->channels);
308 np->channel_num++;
309 spin_unlock_irqrestore(&np->lock, flags);
310
311 return nc;
312 }
313
314 static void ncsi_remove_channel(struct ncsi_channel *nc)
315 {
316 struct ncsi_package *np = nc->package;
317 struct ncsi_channel_filter *ncf;
318 unsigned long flags;
319 int i;
320
321 /* Release filters */
322 spin_lock_irqsave(&nc->lock, flags);
323 for (i = 0; i < NCSI_FILTER_MAX; i++) {
324 ncf = nc->filters[i];
325 if (!ncf)
326 continue;
327
328 nc->filters[i] = NULL;
329 kfree(ncf);
330 }
331
332 nc->state = NCSI_CHANNEL_INACTIVE;
333 spin_unlock_irqrestore(&nc->lock, flags);
334 ncsi_stop_channel_monitor(nc);
335
336 /* Remove and free channel */
337 spin_lock_irqsave(&np->lock, flags);
338 list_del_rcu(&nc->node);
339 np->channel_num--;
340 spin_unlock_irqrestore(&np->lock, flags);
341
342 kfree(nc);
343 }
344
345 struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
346 unsigned char id)
347 {
348 struct ncsi_package *np;
349
350 NCSI_FOR_EACH_PACKAGE(ndp, np) {
351 if (np->id == id)
352 return np;
353 }
354
355 return NULL;
356 }
357
358 struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
359 unsigned char id)
360 {
361 struct ncsi_package *np, *tmp;
362 unsigned long flags;
363
364 np = kzalloc(sizeof(*np), GFP_ATOMIC);
365 if (!np)
366 return NULL;
367
368 np->id = id;
369 np->ndp = ndp;
370 spin_lock_init(&np->lock);
371 INIT_LIST_HEAD(&np->channels);
372
373 spin_lock_irqsave(&ndp->lock, flags);
374 tmp = ncsi_find_package(ndp, id);
375 if (tmp) {
376 spin_unlock_irqrestore(&ndp->lock, flags);
377 kfree(np);
378 return tmp;
379 }
380
381 list_add_tail_rcu(&np->node, &ndp->packages);
382 ndp->package_num++;
383 spin_unlock_irqrestore(&ndp->lock, flags);
384
385 return np;
386 }
387
388 void ncsi_remove_package(struct ncsi_package *np)
389 {
390 struct ncsi_dev_priv *ndp = np->ndp;
391 struct ncsi_channel *nc, *tmp;
392 unsigned long flags;
393
394 /* Release all child channels */
395 list_for_each_entry_safe(nc, tmp, &np->channels, node)
396 ncsi_remove_channel(nc);
397
398 /* Remove and free package */
399 spin_lock_irqsave(&ndp->lock, flags);
400 list_del_rcu(&np->node);
401 ndp->package_num--;
402 spin_unlock_irqrestore(&ndp->lock, flags);
403
404 kfree(np);
405 }
406
407 void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
408 unsigned char id,
409 struct ncsi_package **np,
410 struct ncsi_channel **nc)
411 {
412 struct ncsi_package *p;
413 struct ncsi_channel *c;
414
415 p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
416 c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;
417
418 if (np)
419 *np = p;
420 if (nc)
421 *nc = c;
422 }
423
424 /* For two consecutive NCSI commands, the packet IDs shouldn't
425 * be same. Otherwise, the bogus response might be replied. So
426 * the available IDs are allocated in round-robin fashion.
427 */
428 struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp,
429 unsigned int req_flags)
430 {
431 struct ncsi_request *nr = NULL;
432 int i, limit = ARRAY_SIZE(ndp->requests);
433 unsigned long flags;
434
435 /* Check if there is one available request until the ceiling */
436 spin_lock_irqsave(&ndp->lock, flags);
437 for (i = ndp->request_id; i < limit; i++) {
438 if (ndp->requests[i].used)
439 continue;
440
441 nr = &ndp->requests[i];
442 nr->used = true;
443 nr->flags = req_flags;
444 ndp->request_id = i + 1;
445 goto found;
446 }
447
448 /* Fail back to check from the starting cursor */
449 for (i = NCSI_REQ_START_IDX; i < ndp->request_id; i++) {
450 if (ndp->requests[i].used)
451 continue;
452
453 nr = &ndp->requests[i];
454 nr->used = true;
455 nr->flags = req_flags;
456 ndp->request_id = i + 1;
457 goto found;
458 }
459
460 found:
461 spin_unlock_irqrestore(&ndp->lock, flags);
462 return nr;
463 }
464
465 void ncsi_free_request(struct ncsi_request *nr)
466 {
467 struct ncsi_dev_priv *ndp = nr->ndp;
468 struct sk_buff *cmd, *rsp;
469 unsigned long flags;
470 bool driven;
471
472 if (nr->enabled) {
473 nr->enabled = false;
474 del_timer_sync(&nr->timer);
475 }
476
477 spin_lock_irqsave(&ndp->lock, flags);
478 cmd = nr->cmd;
479 rsp = nr->rsp;
480 nr->cmd = NULL;
481 nr->rsp = NULL;
482 nr->used = false;
483 driven = !!(nr->flags & NCSI_REQ_FLAG_EVENT_DRIVEN);
484 spin_unlock_irqrestore(&ndp->lock, flags);
485
486 if (driven && cmd && --ndp->pending_req_num == 0)
487 schedule_work(&ndp->work);
488
489 /* Release command and response */
490 consume_skb(cmd);
491 consume_skb(rsp);
492 }
493
494 struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
495 {
496 struct ncsi_dev_priv *ndp;
497
498 NCSI_FOR_EACH_DEV(ndp) {
499 if (ndp->ndev.dev == dev)
500 return &ndp->ndev;
501 }
502
503 return NULL;
504 }
505
506 static void ncsi_request_timeout(unsigned long data)
507 {
508 struct ncsi_request *nr = (struct ncsi_request *)data;
509 struct ncsi_dev_priv *ndp = nr->ndp;
510 unsigned long flags;
511
512 /* If the request already had associated response,
513 * let the response handler to release it.
514 */
515 spin_lock_irqsave(&ndp->lock, flags);
516 nr->enabled = false;
517 if (nr->rsp || !nr->cmd) {
518 spin_unlock_irqrestore(&ndp->lock, flags);
519 return;
520 }
521 spin_unlock_irqrestore(&ndp->lock, flags);
522
523 /* Release the request */
524 ncsi_free_request(nr);
525 }
526
527 static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
528 {
529 struct ncsi_dev *nd = &ndp->ndev;
530 struct ncsi_package *np = ndp->active_package;
531 struct ncsi_channel *nc = ndp->active_channel;
532 struct ncsi_cmd_arg nca;
533 unsigned long flags;
534 int ret;
535
536 nca.ndp = ndp;
537 nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
538 switch (nd->state) {
539 case ncsi_dev_state_suspend:
540 nd->state = ncsi_dev_state_suspend_select;
541 /* Fall through */
542 case ncsi_dev_state_suspend_select:
543 ndp->pending_req_num = 1;
544
545 nca.type = NCSI_PKT_CMD_SP;
546 nca.package = np->id;
547 nca.channel = NCSI_RESERVED_CHANNEL;
548 if (ndp->flags & NCSI_DEV_HWA)
549 nca.bytes[0] = 0;
550 else
551 nca.bytes[0] = 1;
552
553 /* To retrieve the last link states of channels in current
554 * package when current active channel needs fail over to
555 * another one. It means we will possibly select another
556 * channel as next active one. The link states of channels
557 * are most important factor of the selection. So we need
558 * accurate link states. Unfortunately, the link states on
559 * inactive channels can't be updated with LSC AEN in time.
560 */
561 if (ndp->flags & NCSI_DEV_RESHUFFLE)
562 nd->state = ncsi_dev_state_suspend_gls;
563 else
564 nd->state = ncsi_dev_state_suspend_dcnt;
565 ret = ncsi_xmit_cmd(&nca);
566 if (ret)
567 goto error;
568
569 break;
570 case ncsi_dev_state_suspend_gls:
571 ndp->pending_req_num = np->channel_num;
572
573 nca.type = NCSI_PKT_CMD_GLS;
574 nca.package = np->id;
575
576 nd->state = ncsi_dev_state_suspend_dcnt;
577 NCSI_FOR_EACH_CHANNEL(np, nc) {
578 nca.channel = nc->id;
579 ret = ncsi_xmit_cmd(&nca);
580 if (ret)
581 goto error;
582 }
583
584 break;
585 case ncsi_dev_state_suspend_dcnt:
586 ndp->pending_req_num = 1;
587
588 nca.type = NCSI_PKT_CMD_DCNT;
589 nca.package = np->id;
590 nca.channel = nc->id;
591
592 nd->state = ncsi_dev_state_suspend_dc;
593 ret = ncsi_xmit_cmd(&nca);
594 if (ret)
595 goto error;
596
597 break;
598 case ncsi_dev_state_suspend_dc:
599 ndp->pending_req_num = 1;
600
601 nca.type = NCSI_PKT_CMD_DC;
602 nca.package = np->id;
603 nca.channel = nc->id;
604 nca.bytes[0] = 1;
605
606 nd->state = ncsi_dev_state_suspend_deselect;
607 ret = ncsi_xmit_cmd(&nca);
608 if (ret)
609 goto error;
610
611 break;
612 case ncsi_dev_state_suspend_deselect:
613 ndp->pending_req_num = 1;
614
615 nca.type = NCSI_PKT_CMD_DP;
616 nca.package = np->id;
617 nca.channel = NCSI_RESERVED_CHANNEL;
618
619 nd->state = ncsi_dev_state_suspend_done;
620 ret = ncsi_xmit_cmd(&nca);
621 if (ret)
622 goto error;
623
624 break;
625 case ncsi_dev_state_suspend_done:
626 spin_lock_irqsave(&nc->lock, flags);
627 nc->state = NCSI_CHANNEL_INACTIVE;
628 spin_unlock_irqrestore(&nc->lock, flags);
629 ncsi_process_next_channel(ndp);
630
631 break;
632 default:
633 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in suspend\n",
634 nd->state);
635 }
636
637 return;
638 error:
639 nd->state = ncsi_dev_state_functional;
640 }
641
642 static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
643 {
644 struct ncsi_dev *nd = &ndp->ndev;
645 struct net_device *dev = nd->dev;
646 struct ncsi_package *np = ndp->active_package;
647 struct ncsi_channel *nc = ndp->active_channel;
648 struct ncsi_channel *hot_nc = NULL;
649 struct ncsi_cmd_arg nca;
650 unsigned char index;
651 unsigned long flags;
652 int ret;
653
654 nca.ndp = ndp;
655 nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
656 switch (nd->state) {
657 case ncsi_dev_state_config:
658 case ncsi_dev_state_config_sp:
659 ndp->pending_req_num = 1;
660
661 /* Select the specific package */
662 nca.type = NCSI_PKT_CMD_SP;
663 if (ndp->flags & NCSI_DEV_HWA)
664 nca.bytes[0] = 0;
665 else
666 nca.bytes[0] = 1;
667 nca.package = np->id;
668 nca.channel = NCSI_RESERVED_CHANNEL;
669 ret = ncsi_xmit_cmd(&nca);
670 if (ret)
671 goto error;
672
673 nd->state = ncsi_dev_state_config_cis;
674 break;
675 case ncsi_dev_state_config_cis:
676 ndp->pending_req_num = 1;
677
678 /* Clear initial state */
679 nca.type = NCSI_PKT_CMD_CIS;
680 nca.package = np->id;
681 nca.channel = nc->id;
682 ret = ncsi_xmit_cmd(&nca);
683 if (ret)
684 goto error;
685
686 nd->state = ncsi_dev_state_config_sma;
687 break;
688 case ncsi_dev_state_config_sma:
689 case ncsi_dev_state_config_ebf:
690 #if IS_ENABLED(CONFIG_IPV6)
691 case ncsi_dev_state_config_egmf:
692 #endif
693 case ncsi_dev_state_config_ecnt:
694 case ncsi_dev_state_config_ec:
695 case ncsi_dev_state_config_ae:
696 case ncsi_dev_state_config_gls:
697 ndp->pending_req_num = 1;
698
699 nca.package = np->id;
700 nca.channel = nc->id;
701
702 /* Use first entry in unicast filter table. Note that
703 * the MAC filter table starts from entry 1 instead of
704 * 0.
705 */
706 if (nd->state == ncsi_dev_state_config_sma) {
707 nca.type = NCSI_PKT_CMD_SMA;
708 for (index = 0; index < 6; index++)
709 nca.bytes[index] = dev->dev_addr[index];
710 nca.bytes[6] = 0x1;
711 nca.bytes[7] = 0x1;
712 nd->state = ncsi_dev_state_config_ebf;
713 } else if (nd->state == ncsi_dev_state_config_ebf) {
714 nca.type = NCSI_PKT_CMD_EBF;
715 nca.dwords[0] = nc->caps[NCSI_CAP_BC].cap;
716 nd->state = ncsi_dev_state_config_ecnt;
717 #if IS_ENABLED(CONFIG_IPV6)
718 if (ndp->inet6_addr_num > 0 &&
719 (nc->caps[NCSI_CAP_GENERIC].cap &
720 NCSI_CAP_GENERIC_MC))
721 nd->state = ncsi_dev_state_config_egmf;
722 else
723 nd->state = ncsi_dev_state_config_ecnt;
724 } else if (nd->state == ncsi_dev_state_config_egmf) {
725 nca.type = NCSI_PKT_CMD_EGMF;
726 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
727 nd->state = ncsi_dev_state_config_ecnt;
728 #endif /* CONFIG_IPV6 */
729 } else if (nd->state == ncsi_dev_state_config_ecnt) {
730 nca.type = NCSI_PKT_CMD_ECNT;
731 nd->state = ncsi_dev_state_config_ec;
732 } else if (nd->state == ncsi_dev_state_config_ec) {
733 /* Enable AEN if it's supported */
734 nca.type = NCSI_PKT_CMD_EC;
735 nd->state = ncsi_dev_state_config_ae;
736 if (!(nc->caps[NCSI_CAP_AEN].cap & NCSI_CAP_AEN_MASK))
737 nd->state = ncsi_dev_state_config_gls;
738 } else if (nd->state == ncsi_dev_state_config_ae) {
739 nca.type = NCSI_PKT_CMD_AE;
740 nca.bytes[0] = 0;
741 nca.dwords[1] = nc->caps[NCSI_CAP_AEN].cap;
742 nd->state = ncsi_dev_state_config_gls;
743 } else if (nd->state == ncsi_dev_state_config_gls) {
744 nca.type = NCSI_PKT_CMD_GLS;
745 nd->state = ncsi_dev_state_config_done;
746 }
747
748 ret = ncsi_xmit_cmd(&nca);
749 if (ret)
750 goto error;
751 break;
752 case ncsi_dev_state_config_done:
753 spin_lock_irqsave(&nc->lock, flags);
754 if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
755 hot_nc = nc;
756 nc->state = NCSI_CHANNEL_ACTIVE;
757 } else {
758 hot_nc = NULL;
759 nc->state = NCSI_CHANNEL_INACTIVE;
760 }
761 spin_unlock_irqrestore(&nc->lock, flags);
762
763 /* Update the hot channel */
764 spin_lock_irqsave(&ndp->lock, flags);
765 ndp->hot_channel = hot_nc;
766 spin_unlock_irqrestore(&ndp->lock, flags);
767
768 ncsi_start_channel_monitor(nc);
769 ncsi_process_next_channel(ndp);
770 break;
771 default:
772 netdev_warn(dev, "Wrong NCSI state 0x%x in config\n",
773 nd->state);
774 }
775
776 return;
777
778 error:
779 ncsi_report_link(ndp, true);
780 }
781
782 static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
783 {
784 struct ncsi_package *np;
785 struct ncsi_channel *nc, *found, *hot_nc;
786 struct ncsi_channel_mode *ncm;
787 unsigned long flags;
788
789 spin_lock_irqsave(&ndp->lock, flags);
790 hot_nc = ndp->hot_channel;
791 spin_unlock_irqrestore(&ndp->lock, flags);
792
793 /* The search is done once an inactive channel with up
794 * link is found.
795 */
796 found = NULL;
797 NCSI_FOR_EACH_PACKAGE(ndp, np) {
798 NCSI_FOR_EACH_CHANNEL(np, nc) {
799 spin_lock_irqsave(&nc->lock, flags);
800
801 if (!list_empty(&nc->link) ||
802 nc->state != NCSI_CHANNEL_INACTIVE) {
803 spin_unlock_irqrestore(&nc->lock, flags);
804 continue;
805 }
806
807 if (!found)
808 found = nc;
809
810 if (nc == hot_nc)
811 found = nc;
812
813 ncm = &nc->modes[NCSI_MODE_LINK];
814 if (ncm->data[2] & 0x1) {
815 spin_unlock_irqrestore(&nc->lock, flags);
816 found = nc;
817 goto out;
818 }
819
820 spin_unlock_irqrestore(&nc->lock, flags);
821 }
822 }
823
824 if (!found) {
825 ncsi_report_link(ndp, true);
826 return -ENODEV;
827 }
828
829 out:
830 spin_lock_irqsave(&ndp->lock, flags);
831 list_add_tail_rcu(&found->link, &ndp->channel_queue);
832 spin_unlock_irqrestore(&ndp->lock, flags);
833
834 return ncsi_process_next_channel(ndp);
835 }
836
837 static bool ncsi_check_hwa(struct ncsi_dev_priv *ndp)
838 {
839 struct ncsi_package *np;
840 struct ncsi_channel *nc;
841 unsigned int cap;
842
843 /* The hardware arbitration is disabled if any one channel
844 * doesn't support explicitly.
845 */
846 NCSI_FOR_EACH_PACKAGE(ndp, np) {
847 NCSI_FOR_EACH_CHANNEL(np, nc) {
848 cap = nc->caps[NCSI_CAP_GENERIC].cap;
849 if (!(cap & NCSI_CAP_GENERIC_HWA) ||
850 (cap & NCSI_CAP_GENERIC_HWA_MASK) !=
851 NCSI_CAP_GENERIC_HWA_SUPPORT) {
852 ndp->flags &= ~NCSI_DEV_HWA;
853 return false;
854 }
855 }
856 }
857
858 ndp->flags |= NCSI_DEV_HWA;
859 return true;
860 }
861
862 static int ncsi_enable_hwa(struct ncsi_dev_priv *ndp)
863 {
864 struct ncsi_package *np;
865 struct ncsi_channel *nc;
866 unsigned long flags;
867
868 /* Move all available channels to processing queue */
869 spin_lock_irqsave(&ndp->lock, flags);
870 NCSI_FOR_EACH_PACKAGE(ndp, np) {
871 NCSI_FOR_EACH_CHANNEL(np, nc) {
872 WARN_ON_ONCE(nc->state != NCSI_CHANNEL_INACTIVE ||
873 !list_empty(&nc->link));
874 ncsi_stop_channel_monitor(nc);
875 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
876 }
877 }
878 spin_unlock_irqrestore(&ndp->lock, flags);
879
880 /* We can have no channels in extremely case */
881 if (list_empty(&ndp->channel_queue)) {
882 ncsi_report_link(ndp, false);
883 return -ENOENT;
884 }
885
886 return ncsi_process_next_channel(ndp);
887 }
888
889 static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
890 {
891 struct ncsi_dev *nd = &ndp->ndev;
892 struct ncsi_package *np;
893 struct ncsi_channel *nc;
894 struct ncsi_cmd_arg nca;
895 unsigned char index;
896 int ret;
897
898 nca.ndp = ndp;
899 nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
900 switch (nd->state) {
901 case ncsi_dev_state_probe:
902 nd->state = ncsi_dev_state_probe_deselect;
903 /* Fall through */
904 case ncsi_dev_state_probe_deselect:
905 ndp->pending_req_num = 8;
906
907 /* Deselect all possible packages */
908 nca.type = NCSI_PKT_CMD_DP;
909 nca.channel = NCSI_RESERVED_CHANNEL;
910 for (index = 0; index < 8; index++) {
911 nca.package = index;
912 ret = ncsi_xmit_cmd(&nca);
913 if (ret)
914 goto error;
915 }
916
917 nd->state = ncsi_dev_state_probe_package;
918 break;
919 case ncsi_dev_state_probe_package:
920 ndp->pending_req_num = 16;
921
922 /* Select all possible packages */
923 nca.type = NCSI_PKT_CMD_SP;
924 nca.bytes[0] = 1;
925 nca.channel = NCSI_RESERVED_CHANNEL;
926 for (index = 0; index < 8; index++) {
927 nca.package = index;
928 ret = ncsi_xmit_cmd(&nca);
929 if (ret)
930 goto error;
931 }
932
933 /* Disable all possible packages */
934 nca.type = NCSI_PKT_CMD_DP;
935 for (index = 0; index < 8; index++) {
936 nca.package = index;
937 ret = ncsi_xmit_cmd(&nca);
938 if (ret)
939 goto error;
940 }
941
942 nd->state = ncsi_dev_state_probe_channel;
943 break;
944 case ncsi_dev_state_probe_channel:
945 if (!ndp->active_package)
946 ndp->active_package = list_first_or_null_rcu(
947 &ndp->packages, struct ncsi_package, node);
948 else if (list_is_last(&ndp->active_package->node,
949 &ndp->packages))
950 ndp->active_package = NULL;
951 else
952 ndp->active_package = list_next_entry(
953 ndp->active_package, node);
954
955 /* All available packages and channels are enumerated. The
956 * enumeration happens for once when the NCSI interface is
957 * started. So we need continue to start the interface after
958 * the enumeration.
959 *
960 * We have to choose an active channel before configuring it.
961 * Note that we possibly don't have active channel in extreme
962 * situation.
963 */
964 if (!ndp->active_package) {
965 ndp->flags |= NCSI_DEV_PROBED;
966 if (ncsi_check_hwa(ndp))
967 ncsi_enable_hwa(ndp);
968 else
969 ncsi_choose_active_channel(ndp);
970 return;
971 }
972
973 /* Select the active package */
974 ndp->pending_req_num = 1;
975 nca.type = NCSI_PKT_CMD_SP;
976 nca.bytes[0] = 1;
977 nca.package = ndp->active_package->id;
978 nca.channel = NCSI_RESERVED_CHANNEL;
979 ret = ncsi_xmit_cmd(&nca);
980 if (ret)
981 goto error;
982
983 nd->state = ncsi_dev_state_probe_cis;
984 break;
985 case ncsi_dev_state_probe_cis:
986 ndp->pending_req_num = NCSI_RESERVED_CHANNEL;
987
988 /* Clear initial state */
989 nca.type = NCSI_PKT_CMD_CIS;
990 nca.package = ndp->active_package->id;
991 for (index = 0; index < NCSI_RESERVED_CHANNEL; index++) {
992 nca.channel = index;
993 ret = ncsi_xmit_cmd(&nca);
994 if (ret)
995 goto error;
996 }
997
998 nd->state = ncsi_dev_state_probe_gvi;
999 break;
1000 case ncsi_dev_state_probe_gvi:
1001 case ncsi_dev_state_probe_gc:
1002 case ncsi_dev_state_probe_gls:
1003 np = ndp->active_package;
1004 ndp->pending_req_num = np->channel_num;
1005
1006 /* Retrieve version, capability or link status */
1007 if (nd->state == ncsi_dev_state_probe_gvi)
1008 nca.type = NCSI_PKT_CMD_GVI;
1009 else if (nd->state == ncsi_dev_state_probe_gc)
1010 nca.type = NCSI_PKT_CMD_GC;
1011 else
1012 nca.type = NCSI_PKT_CMD_GLS;
1013
1014 nca.package = np->id;
1015 NCSI_FOR_EACH_CHANNEL(np, nc) {
1016 nca.channel = nc->id;
1017 ret = ncsi_xmit_cmd(&nca);
1018 if (ret)
1019 goto error;
1020 }
1021
1022 if (nd->state == ncsi_dev_state_probe_gvi)
1023 nd->state = ncsi_dev_state_probe_gc;
1024 else if (nd->state == ncsi_dev_state_probe_gc)
1025 nd->state = ncsi_dev_state_probe_gls;
1026 else
1027 nd->state = ncsi_dev_state_probe_dp;
1028 break;
1029 case ncsi_dev_state_probe_dp:
1030 ndp->pending_req_num = 1;
1031
1032 /* Deselect the active package */
1033 nca.type = NCSI_PKT_CMD_DP;
1034 nca.package = ndp->active_package->id;
1035 nca.channel = NCSI_RESERVED_CHANNEL;
1036 ret = ncsi_xmit_cmd(&nca);
1037 if (ret)
1038 goto error;
1039
1040 /* Scan channels in next package */
1041 nd->state = ncsi_dev_state_probe_channel;
1042 break;
1043 default:
1044 netdev_warn(nd->dev, "Wrong NCSI state 0x%0x in enumeration\n",
1045 nd->state);
1046 }
1047
1048 return;
1049 error:
1050 ncsi_report_link(ndp, true);
1051 }
1052
1053 static void ncsi_dev_work(struct work_struct *work)
1054 {
1055 struct ncsi_dev_priv *ndp = container_of(work,
1056 struct ncsi_dev_priv, work);
1057 struct ncsi_dev *nd = &ndp->ndev;
1058
1059 switch (nd->state & ncsi_dev_state_major) {
1060 case ncsi_dev_state_probe:
1061 ncsi_probe_channel(ndp);
1062 break;
1063 case ncsi_dev_state_suspend:
1064 ncsi_suspend_channel(ndp);
1065 break;
1066 case ncsi_dev_state_config:
1067 ncsi_configure_channel(ndp);
1068 break;
1069 default:
1070 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in workqueue\n",
1071 nd->state);
1072 }
1073 }
1074
1075 int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
1076 {
1077 struct ncsi_channel *nc;
1078 int old_state;
1079 unsigned long flags;
1080
1081 spin_lock_irqsave(&ndp->lock, flags);
1082 nc = list_first_or_null_rcu(&ndp->channel_queue,
1083 struct ncsi_channel, link);
1084 if (!nc) {
1085 spin_unlock_irqrestore(&ndp->lock, flags);
1086 goto out;
1087 }
1088
1089 list_del_init(&nc->link);
1090 spin_unlock_irqrestore(&ndp->lock, flags);
1091
1092 spin_lock_irqsave(&nc->lock, flags);
1093 old_state = nc->state;
1094 nc->state = NCSI_CHANNEL_INVISIBLE;
1095 spin_unlock_irqrestore(&nc->lock, flags);
1096
1097 ndp->active_channel = nc;
1098 ndp->active_package = nc->package;
1099
1100 switch (old_state) {
1101 case NCSI_CHANNEL_INACTIVE:
1102 ndp->ndev.state = ncsi_dev_state_config;
1103 ncsi_configure_channel(ndp);
1104 break;
1105 case NCSI_CHANNEL_ACTIVE:
1106 ndp->ndev.state = ncsi_dev_state_suspend;
1107 ncsi_suspend_channel(ndp);
1108 break;
1109 default:
1110 netdev_err(ndp->ndev.dev, "Invalid state 0x%x on %d:%d\n",
1111 old_state, nc->package->id, nc->id);
1112 ncsi_report_link(ndp, false);
1113 return -EINVAL;
1114 }
1115
1116 return 0;
1117
1118 out:
1119 ndp->active_channel = NULL;
1120 ndp->active_package = NULL;
1121 if (ndp->flags & NCSI_DEV_RESHUFFLE) {
1122 ndp->flags &= ~NCSI_DEV_RESHUFFLE;
1123 return ncsi_choose_active_channel(ndp);
1124 }
1125
1126 ncsi_report_link(ndp, false);
1127 return -ENODEV;
1128 }
1129
1130 #if IS_ENABLED(CONFIG_IPV6)
1131 static int ncsi_inet6addr_event(struct notifier_block *this,
1132 unsigned long event, void *data)
1133 {
1134 struct inet6_ifaddr *ifa = data;
1135 struct net_device *dev = ifa->idev->dev;
1136 struct ncsi_dev *nd = ncsi_find_dev(dev);
1137 struct ncsi_dev_priv *ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
1138 struct ncsi_package *np;
1139 struct ncsi_channel *nc;
1140 struct ncsi_cmd_arg nca;
1141 bool action;
1142 int ret;
1143
1144 if (!ndp || (ipv6_addr_type(&ifa->addr) &
1145 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)))
1146 return NOTIFY_OK;
1147
1148 switch (event) {
1149 case NETDEV_UP:
1150 action = (++ndp->inet6_addr_num) == 1;
1151 nca.type = NCSI_PKT_CMD_EGMF;
1152 break;
1153 case NETDEV_DOWN:
1154 action = (--ndp->inet6_addr_num == 0);
1155 nca.type = NCSI_PKT_CMD_DGMF;
1156 break;
1157 default:
1158 return NOTIFY_OK;
1159 }
1160
1161 /* We might not have active channel or packages. The IPv6
1162 * required multicast will be enabled when active channel
1163 * or packages are chosen.
1164 */
1165 np = ndp->active_package;
1166 nc = ndp->active_channel;
1167 if (!action || !np || !nc)
1168 return NOTIFY_OK;
1169
1170 /* We needn't enable or disable it if the function isn't supported */
1171 if (!(nc->caps[NCSI_CAP_GENERIC].cap & NCSI_CAP_GENERIC_MC))
1172 return NOTIFY_OK;
1173
1174 nca.ndp = ndp;
1175 nca.req_flags = 0;
1176 nca.package = np->id;
1177 nca.channel = nc->id;
1178 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
1179 ret = ncsi_xmit_cmd(&nca);
1180 if (ret) {
1181 netdev_warn(dev, "Fail to %s global multicast filter (%d)\n",
1182 (event == NETDEV_UP) ? "enable" : "disable", ret);
1183 return NOTIFY_DONE;
1184 }
1185
1186 return NOTIFY_OK;
1187 }
1188
1189 static struct notifier_block ncsi_inet6addr_notifier = {
1190 .notifier_call = ncsi_inet6addr_event,
1191 };
1192 #endif /* CONFIG_IPV6 */
1193
1194 struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
1195 void (*handler)(struct ncsi_dev *ndev))
1196 {
1197 struct ncsi_dev_priv *ndp;
1198 struct ncsi_dev *nd;
1199 unsigned long flags;
1200 int i;
1201
1202 /* Check if the device has been registered or not */
1203 nd = ncsi_find_dev(dev);
1204 if (nd)
1205 return nd;
1206
1207 /* Create NCSI device */
1208 ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
1209 if (!ndp)
1210 return NULL;
1211
1212 nd = &ndp->ndev;
1213 nd->state = ncsi_dev_state_registered;
1214 nd->dev = dev;
1215 nd->handler = handler;
1216 ndp->pending_req_num = 0;
1217 INIT_LIST_HEAD(&ndp->channel_queue);
1218 INIT_WORK(&ndp->work, ncsi_dev_work);
1219
1220 /* Initialize private NCSI device */
1221 spin_lock_init(&ndp->lock);
1222 INIT_LIST_HEAD(&ndp->packages);
1223 ndp->request_id = NCSI_REQ_START_IDX;
1224 for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
1225 ndp->requests[i].id = i;
1226 ndp->requests[i].ndp = ndp;
1227 setup_timer(&ndp->requests[i].timer,
1228 ncsi_request_timeout,
1229 (unsigned long)&ndp->requests[i]);
1230 }
1231
1232 spin_lock_irqsave(&ncsi_dev_lock, flags);
1233 #if IS_ENABLED(CONFIG_IPV6)
1234 ndp->inet6_addr_num = 0;
1235 if (list_empty(&ncsi_dev_list))
1236 register_inet6addr_notifier(&ncsi_inet6addr_notifier);
1237 #endif
1238 list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
1239 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1240
1241 /* Register NCSI packet Rx handler */
1242 ndp->ptype.type = cpu_to_be16(ETH_P_NCSI);
1243 ndp->ptype.func = ncsi_rcv_rsp;
1244 ndp->ptype.dev = dev;
1245 dev_add_pack(&ndp->ptype);
1246
1247 return nd;
1248 }
1249 EXPORT_SYMBOL_GPL(ncsi_register_dev);
1250
1251 int ncsi_start_dev(struct ncsi_dev *nd)
1252 {
1253 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1254 int ret;
1255
1256 if (nd->state != ncsi_dev_state_registered &&
1257 nd->state != ncsi_dev_state_functional)
1258 return -ENOTTY;
1259
1260 if (!(ndp->flags & NCSI_DEV_PROBED)) {
1261 nd->state = ncsi_dev_state_probe;
1262 schedule_work(&ndp->work);
1263 return 0;
1264 }
1265
1266 if (ndp->flags & NCSI_DEV_HWA)
1267 ret = ncsi_enable_hwa(ndp);
1268 else
1269 ret = ncsi_choose_active_channel(ndp);
1270
1271 return ret;
1272 }
1273 EXPORT_SYMBOL_GPL(ncsi_start_dev);
1274
1275 void ncsi_stop_dev(struct ncsi_dev *nd)
1276 {
1277 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1278 struct ncsi_package *np;
1279 struct ncsi_channel *nc;
1280 bool chained;
1281 int old_state;
1282 unsigned long flags;
1283
1284 /* Stop the channel monitor and reset channel's state */
1285 NCSI_FOR_EACH_PACKAGE(ndp, np) {
1286 NCSI_FOR_EACH_CHANNEL(np, nc) {
1287 ncsi_stop_channel_monitor(nc);
1288
1289 spin_lock_irqsave(&nc->lock, flags);
1290 chained = !list_empty(&nc->link);
1291 old_state = nc->state;
1292 nc->state = NCSI_CHANNEL_INACTIVE;
1293 spin_unlock_irqrestore(&nc->lock, flags);
1294
1295 WARN_ON_ONCE(chained ||
1296 old_state == NCSI_CHANNEL_INVISIBLE);
1297 }
1298 }
1299
1300 ncsi_report_link(ndp, true);
1301 }
1302 EXPORT_SYMBOL_GPL(ncsi_stop_dev);
1303
1304 void ncsi_unregister_dev(struct ncsi_dev *nd)
1305 {
1306 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1307 struct ncsi_package *np, *tmp;
1308 unsigned long flags;
1309
1310 dev_remove_pack(&ndp->ptype);
1311
1312 list_for_each_entry_safe(np, tmp, &ndp->packages, node)
1313 ncsi_remove_package(np);
1314
1315 spin_lock_irqsave(&ncsi_dev_lock, flags);
1316 list_del_rcu(&ndp->node);
1317 #if IS_ENABLED(CONFIG_IPV6)
1318 if (list_empty(&ncsi_dev_list))
1319 unregister_inet6addr_notifier(&ncsi_inet6addr_notifier);
1320 #endif
1321 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1322
1323 kfree(ndp);
1324 }
1325 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
Linux with added FPC-III support