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[deliverable/linux.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 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
136 nd->state = ncsi_dev_state_functional;
137 if (force_down) {
138 nd->link_up = 0;
139 goto report;
140 }
141
142 nd->link_up = 0;
143 NCSI_FOR_EACH_PACKAGE(ndp, np) {
144 NCSI_FOR_EACH_CHANNEL(np, nc) {
145 if (!list_empty(&nc->link) ||
146 nc->state != NCSI_CHANNEL_ACTIVE)
147 continue;
148
149 if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
150 nd->link_up = 1;
151 goto report;
152 }
153 }
154 }
155
156 report:
157 nd->handler(nd);
158 }
159
160 static void ncsi_channel_monitor(unsigned long data)
161 {
162 struct ncsi_channel *nc = (struct ncsi_channel *)data;
163 struct ncsi_package *np = nc->package;
164 struct ncsi_dev_priv *ndp = np->ndp;
165 struct ncsi_cmd_arg nca;
166 bool enabled;
167 unsigned int timeout;
168 unsigned long flags;
169 int ret;
170
171 spin_lock_irqsave(&nc->lock, flags);
172 timeout = nc->timeout;
173 enabled = nc->enabled;
174 spin_unlock_irqrestore(&nc->lock, flags);
175
176 if (!enabled || !list_empty(&nc->link))
177 return;
178 if (nc->state != NCSI_CHANNEL_INACTIVE &&
179 nc->state != NCSI_CHANNEL_ACTIVE)
180 return;
181
182 if (!(timeout % 2)) {
183 nca.ndp = ndp;
184 nca.package = np->id;
185 nca.channel = nc->id;
186 nca.type = NCSI_PKT_CMD_GLS;
187 nca.driven = false;
188 ret = ncsi_xmit_cmd(&nca);
189 if (ret) {
190 netdev_err(ndp->ndev.dev, "Error %d sending GLS\n",
191 ret);
192 return;
193 }
194 }
195
196 if (timeout + 1 >= 3) {
197 if (!(ndp->flags & NCSI_DEV_HWA) &&
198 nc->state == NCSI_CHANNEL_ACTIVE)
199 ncsi_report_link(ndp, true);
200
201 spin_lock_irqsave(&ndp->lock, flags);
202 xchg(&nc->state, NCSI_CHANNEL_INACTIVE);
203 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
204 spin_unlock_irqrestore(&ndp->lock, flags);
205 ncsi_process_next_channel(ndp);
206 return;
207 }
208
209 spin_lock_irqsave(&nc->lock, flags);
210 nc->timeout = timeout + 1;
211 nc->enabled = true;
212 spin_unlock_irqrestore(&nc->lock, flags);
213 mod_timer(&nc->timer, jiffies + HZ * (1 << (nc->timeout / 2)));
214 }
215
216 void ncsi_start_channel_monitor(struct ncsi_channel *nc)
217 {
218 unsigned long flags;
219
220 spin_lock_irqsave(&nc->lock, flags);
221 WARN_ON_ONCE(nc->enabled);
222 nc->timeout = 0;
223 nc->enabled = true;
224 spin_unlock_irqrestore(&nc->lock, flags);
225
226 mod_timer(&nc->timer, jiffies + HZ * (1 << (nc->timeout / 2)));
227 }
228
229 void ncsi_stop_channel_monitor(struct ncsi_channel *nc)
230 {
231 unsigned long flags;
232
233 spin_lock_irqsave(&nc->lock, flags);
234 if (!nc->enabled) {
235 spin_unlock_irqrestore(&nc->lock, flags);
236 return;
237 }
238 nc->enabled = false;
239 spin_unlock_irqrestore(&nc->lock, flags);
240
241 del_timer_sync(&nc->timer);
242 }
243
244 struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
245 unsigned char id)
246 {
247 struct ncsi_channel *nc;
248
249 NCSI_FOR_EACH_CHANNEL(np, nc) {
250 if (nc->id == id)
251 return nc;
252 }
253
254 return NULL;
255 }
256
257 struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
258 {
259 struct ncsi_channel *nc, *tmp;
260 int index;
261 unsigned long flags;
262
263 nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
264 if (!nc)
265 return NULL;
266
267 nc->id = id;
268 nc->package = np;
269 nc->state = NCSI_CHANNEL_INACTIVE;
270 nc->enabled = false;
271 setup_timer(&nc->timer, ncsi_channel_monitor, (unsigned long)nc);
272 spin_lock_init(&nc->lock);
273 INIT_LIST_HEAD(&nc->link);
274 for (index = 0; index < NCSI_CAP_MAX; index++)
275 nc->caps[index].index = index;
276 for (index = 0; index < NCSI_MODE_MAX; index++)
277 nc->modes[index].index = index;
278
279 spin_lock_irqsave(&np->lock, flags);
280 tmp = ncsi_find_channel(np, id);
281 if (tmp) {
282 spin_unlock_irqrestore(&np->lock, flags);
283 kfree(nc);
284 return tmp;
285 }
286
287 list_add_tail_rcu(&nc->node, &np->channels);
288 np->channel_num++;
289 spin_unlock_irqrestore(&np->lock, flags);
290
291 return nc;
292 }
293
294 static void ncsi_remove_channel(struct ncsi_channel *nc)
295 {
296 struct ncsi_package *np = nc->package;
297 struct ncsi_channel_filter *ncf;
298 unsigned long flags;
299 int i;
300
301 /* Release filters */
302 spin_lock_irqsave(&nc->lock, flags);
303 for (i = 0; i < NCSI_FILTER_MAX; i++) {
304 ncf = nc->filters[i];
305 if (!ncf)
306 continue;
307
308 nc->filters[i] = NULL;
309 kfree(ncf);
310 }
311
312 nc->state = NCSI_CHANNEL_INACTIVE;
313 spin_unlock_irqrestore(&nc->lock, flags);
314 ncsi_stop_channel_monitor(nc);
315
316 /* Remove and free channel */
317 spin_lock_irqsave(&np->lock, flags);
318 list_del_rcu(&nc->node);
319 np->channel_num--;
320 spin_unlock_irqrestore(&np->lock, flags);
321
322 kfree(nc);
323 }
324
325 struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
326 unsigned char id)
327 {
328 struct ncsi_package *np;
329
330 NCSI_FOR_EACH_PACKAGE(ndp, np) {
331 if (np->id == id)
332 return np;
333 }
334
335 return NULL;
336 }
337
338 struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
339 unsigned char id)
340 {
341 struct ncsi_package *np, *tmp;
342 unsigned long flags;
343
344 np = kzalloc(sizeof(*np), GFP_ATOMIC);
345 if (!np)
346 return NULL;
347
348 np->id = id;
349 np->ndp = ndp;
350 spin_lock_init(&np->lock);
351 INIT_LIST_HEAD(&np->channels);
352
353 spin_lock_irqsave(&ndp->lock, flags);
354 tmp = ncsi_find_package(ndp, id);
355 if (tmp) {
356 spin_unlock_irqrestore(&ndp->lock, flags);
357 kfree(np);
358 return tmp;
359 }
360
361 list_add_tail_rcu(&np->node, &ndp->packages);
362 ndp->package_num++;
363 spin_unlock_irqrestore(&ndp->lock, flags);
364
365 return np;
366 }
367
368 void ncsi_remove_package(struct ncsi_package *np)
369 {
370 struct ncsi_dev_priv *ndp = np->ndp;
371 struct ncsi_channel *nc, *tmp;
372 unsigned long flags;
373
374 /* Release all child channels */
375 list_for_each_entry_safe(nc, tmp, &np->channels, node)
376 ncsi_remove_channel(nc);
377
378 /* Remove and free package */
379 spin_lock_irqsave(&ndp->lock, flags);
380 list_del_rcu(&np->node);
381 ndp->package_num--;
382 spin_unlock_irqrestore(&ndp->lock, flags);
383
384 kfree(np);
385 }
386
387 void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
388 unsigned char id,
389 struct ncsi_package **np,
390 struct ncsi_channel **nc)
391 {
392 struct ncsi_package *p;
393 struct ncsi_channel *c;
394
395 p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
396 c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;
397
398 if (np)
399 *np = p;
400 if (nc)
401 *nc = c;
402 }
403
404 /* For two consecutive NCSI commands, the packet IDs shouldn't
405 * be same. Otherwise, the bogus response might be replied. So
406 * the available IDs are allocated in round-robin fashion.
407 */
408 struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp, bool driven)
409 {
410 struct ncsi_request *nr = NULL;
411 int i, limit = ARRAY_SIZE(ndp->requests);
412 unsigned long flags;
413
414 /* Check if there is one available request until the ceiling */
415 spin_lock_irqsave(&ndp->lock, flags);
416 for (i = ndp->request_id; !nr && i < limit; i++) {
417 if (ndp->requests[i].used)
418 continue;
419
420 nr = &ndp->requests[i];
421 nr->used = true;
422 nr->driven = driven;
423 if (++ndp->request_id >= limit)
424 ndp->request_id = 0;
425 }
426
427 /* Fail back to check from the starting cursor */
428 for (i = 0; !nr && i < ndp->request_id; i++) {
429 if (ndp->requests[i].used)
430 continue;
431
432 nr = &ndp->requests[i];
433 nr->used = true;
434 nr->driven = driven;
435 if (++ndp->request_id >= limit)
436 ndp->request_id = 0;
437 }
438 spin_unlock_irqrestore(&ndp->lock, flags);
439
440 return nr;
441 }
442
443 void ncsi_free_request(struct ncsi_request *nr)
444 {
445 struct ncsi_dev_priv *ndp = nr->ndp;
446 struct sk_buff *cmd, *rsp;
447 unsigned long flags;
448 bool driven;
449
450 if (nr->enabled) {
451 nr->enabled = false;
452 del_timer_sync(&nr->timer);
453 }
454
455 spin_lock_irqsave(&ndp->lock, flags);
456 cmd = nr->cmd;
457 rsp = nr->rsp;
458 nr->cmd = NULL;
459 nr->rsp = NULL;
460 nr->used = false;
461 driven = nr->driven;
462 spin_unlock_irqrestore(&ndp->lock, flags);
463
464 if (driven && cmd && --ndp->pending_req_num == 0)
465 schedule_work(&ndp->work);
466
467 /* Release command and response */
468 consume_skb(cmd);
469 consume_skb(rsp);
470 }
471
472 struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
473 {
474 struct ncsi_dev_priv *ndp;
475
476 NCSI_FOR_EACH_DEV(ndp) {
477 if (ndp->ndev.dev == dev)
478 return &ndp->ndev;
479 }
480
481 return NULL;
482 }
483
484 static void ncsi_request_timeout(unsigned long data)
485 {
486 struct ncsi_request *nr = (struct ncsi_request *)data;
487 struct ncsi_dev_priv *ndp = nr->ndp;
488 unsigned long flags;
489
490 /* If the request already had associated response,
491 * let the response handler to release it.
492 */
493 spin_lock_irqsave(&ndp->lock, flags);
494 nr->enabled = false;
495 if (nr->rsp || !nr->cmd) {
496 spin_unlock_irqrestore(&ndp->lock, flags);
497 return;
498 }
499 spin_unlock_irqrestore(&ndp->lock, flags);
500
501 /* Release the request */
502 ncsi_free_request(nr);
503 }
504
505 static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
506 {
507 struct ncsi_dev *nd = &ndp->ndev;
508 struct ncsi_package *np = ndp->active_package;
509 struct ncsi_channel *nc = ndp->active_channel;
510 struct ncsi_cmd_arg nca;
511 int ret;
512
513 nca.ndp = ndp;
514 nca.driven = true;
515 switch (nd->state) {
516 case ncsi_dev_state_suspend:
517 nd->state = ncsi_dev_state_suspend_select;
518 /* Fall through */
519 case ncsi_dev_state_suspend_select:
520 case ncsi_dev_state_suspend_dcnt:
521 case ncsi_dev_state_suspend_dc:
522 case ncsi_dev_state_suspend_deselect:
523 ndp->pending_req_num = 1;
524
525 np = ndp->active_package;
526 nc = ndp->active_channel;
527 nca.package = np->id;
528 if (nd->state == ncsi_dev_state_suspend_select) {
529 nca.type = NCSI_PKT_CMD_SP;
530 nca.channel = 0x1f;
531 if (ndp->flags & NCSI_DEV_HWA)
532 nca.bytes[0] = 0;
533 else
534 nca.bytes[0] = 1;
535 nd->state = ncsi_dev_state_suspend_dcnt;
536 } else if (nd->state == ncsi_dev_state_suspend_dcnt) {
537 nca.type = NCSI_PKT_CMD_DCNT;
538 nca.channel = nc->id;
539 nd->state = ncsi_dev_state_suspend_dc;
540 } else if (nd->state == ncsi_dev_state_suspend_dc) {
541 nca.type = NCSI_PKT_CMD_DC;
542 nca.channel = nc->id;
543 nca.bytes[0] = 1;
544 nd->state = ncsi_dev_state_suspend_deselect;
545 } else if (nd->state == ncsi_dev_state_suspend_deselect) {
546 nca.type = NCSI_PKT_CMD_DP;
547 nca.channel = 0x1f;
548 nd->state = ncsi_dev_state_suspend_done;
549 }
550
551 ret = ncsi_xmit_cmd(&nca);
552 if (ret) {
553 nd->state = ncsi_dev_state_functional;
554 return;
555 }
556
557 break;
558 case ncsi_dev_state_suspend_done:
559 xchg(&nc->state, NCSI_CHANNEL_INACTIVE);
560 ncsi_process_next_channel(ndp);
561
562 break;
563 default:
564 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in suspend\n",
565 nd->state);
566 }
567 }
568
569 static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
570 {
571 struct ncsi_dev *nd = &ndp->ndev;
572 struct net_device *dev = nd->dev;
573 struct ncsi_package *np = ndp->active_package;
574 struct ncsi_channel *nc = ndp->active_channel;
575 struct ncsi_cmd_arg nca;
576 unsigned char index;
577 int ret;
578
579 nca.ndp = ndp;
580 nca.driven = true;
581 switch (nd->state) {
582 case ncsi_dev_state_config:
583 case ncsi_dev_state_config_sp:
584 ndp->pending_req_num = 1;
585
586 /* Select the specific package */
587 nca.type = NCSI_PKT_CMD_SP;
588 if (ndp->flags & NCSI_DEV_HWA)
589 nca.bytes[0] = 0;
590 else
591 nca.bytes[0] = 1;
592 nca.package = np->id;
593 nca.channel = 0x1f;
594 ret = ncsi_xmit_cmd(&nca);
595 if (ret)
596 goto error;
597
598 nd->state = ncsi_dev_state_config_cis;
599 break;
600 case ncsi_dev_state_config_cis:
601 ndp->pending_req_num = 1;
602
603 /* Clear initial state */
604 nca.type = NCSI_PKT_CMD_CIS;
605 nca.package = np->id;
606 nca.channel = nc->id;
607 ret = ncsi_xmit_cmd(&nca);
608 if (ret)
609 goto error;
610
611 nd->state = ncsi_dev_state_config_sma;
612 break;
613 case ncsi_dev_state_config_sma:
614 case ncsi_dev_state_config_ebf:
615 #if IS_ENABLED(CONFIG_IPV6)
616 case ncsi_dev_state_config_egmf:
617 #endif
618 case ncsi_dev_state_config_ecnt:
619 case ncsi_dev_state_config_ec:
620 case ncsi_dev_state_config_ae:
621 case ncsi_dev_state_config_gls:
622 ndp->pending_req_num = 1;
623
624 nca.package = np->id;
625 nca.channel = nc->id;
626
627 /* Use first entry in unicast filter table. Note that
628 * the MAC filter table starts from entry 1 instead of
629 * 0.
630 */
631 if (nd->state == ncsi_dev_state_config_sma) {
632 nca.type = NCSI_PKT_CMD_SMA;
633 for (index = 0; index < 6; index++)
634 nca.bytes[index] = dev->dev_addr[index];
635 nca.bytes[6] = 0x1;
636 nca.bytes[7] = 0x1;
637 nd->state = ncsi_dev_state_config_ebf;
638 } else if (nd->state == ncsi_dev_state_config_ebf) {
639 nca.type = NCSI_PKT_CMD_EBF;
640 nca.dwords[0] = nc->caps[NCSI_CAP_BC].cap;
641 nd->state = ncsi_dev_state_config_ecnt;
642 #if IS_ENABLED(CONFIG_IPV6)
643 if (ndp->inet6_addr_num > 0 &&
644 (nc->caps[NCSI_CAP_GENERIC].cap &
645 NCSI_CAP_GENERIC_MC))
646 nd->state = ncsi_dev_state_config_egmf;
647 else
648 nd->state = ncsi_dev_state_config_ecnt;
649 } else if (nd->state == ncsi_dev_state_config_egmf) {
650 nca.type = NCSI_PKT_CMD_EGMF;
651 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
652 nd->state = ncsi_dev_state_config_ecnt;
653 #endif /* CONFIG_IPV6 */
654 } else if (nd->state == ncsi_dev_state_config_ecnt) {
655 nca.type = NCSI_PKT_CMD_ECNT;
656 nd->state = ncsi_dev_state_config_ec;
657 } else if (nd->state == ncsi_dev_state_config_ec) {
658 /* Enable AEN if it's supported */
659 nca.type = NCSI_PKT_CMD_EC;
660 nd->state = ncsi_dev_state_config_ae;
661 if (!(nc->caps[NCSI_CAP_AEN].cap & NCSI_CAP_AEN_MASK))
662 nd->state = ncsi_dev_state_config_gls;
663 } else if (nd->state == ncsi_dev_state_config_ae) {
664 nca.type = NCSI_PKT_CMD_AE;
665 nca.bytes[0] = 0;
666 nca.dwords[1] = nc->caps[NCSI_CAP_AEN].cap;
667 nd->state = ncsi_dev_state_config_gls;
668 } else if (nd->state == ncsi_dev_state_config_gls) {
669 nca.type = NCSI_PKT_CMD_GLS;
670 nd->state = ncsi_dev_state_config_done;
671 }
672
673 ret = ncsi_xmit_cmd(&nca);
674 if (ret)
675 goto error;
676 break;
677 case ncsi_dev_state_config_done:
678 if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1)
679 xchg(&nc->state, NCSI_CHANNEL_ACTIVE);
680 else
681 xchg(&nc->state, NCSI_CHANNEL_INACTIVE);
682
683 ncsi_start_channel_monitor(nc);
684 ncsi_process_next_channel(ndp);
685 break;
686 default:
687 netdev_warn(dev, "Wrong NCSI state 0x%x in config\n",
688 nd->state);
689 }
690
691 return;
692
693 error:
694 ncsi_report_link(ndp, true);
695 }
696
697 static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
698 {
699 struct ncsi_package *np;
700 struct ncsi_channel *nc, *found;
701 struct ncsi_channel_mode *ncm;
702 unsigned long flags;
703
704 /* The search is done once an inactive channel with up
705 * link is found.
706 */
707 found = NULL;
708 NCSI_FOR_EACH_PACKAGE(ndp, np) {
709 NCSI_FOR_EACH_CHANNEL(np, nc) {
710 if (!list_empty(&nc->link) ||
711 nc->state != NCSI_CHANNEL_INACTIVE)
712 continue;
713
714 if (!found)
715 found = nc;
716
717 ncm = &nc->modes[NCSI_MODE_LINK];
718 if (ncm->data[2] & 0x1) {
719 found = nc;
720 goto out;
721 }
722 }
723 }
724
725 if (!found) {
726 ncsi_report_link(ndp, true);
727 return -ENODEV;
728 }
729
730 out:
731 spin_lock_irqsave(&ndp->lock, flags);
732 list_add_tail_rcu(&found->link, &ndp->channel_queue);
733 spin_unlock_irqrestore(&ndp->lock, flags);
734
735 return ncsi_process_next_channel(ndp);
736 }
737
738 static bool ncsi_check_hwa(struct ncsi_dev_priv *ndp)
739 {
740 struct ncsi_package *np;
741 struct ncsi_channel *nc;
742 unsigned int cap;
743
744 /* The hardware arbitration is disabled if any one channel
745 * doesn't support explicitly.
746 */
747 NCSI_FOR_EACH_PACKAGE(ndp, np) {
748 NCSI_FOR_EACH_CHANNEL(np, nc) {
749 cap = nc->caps[NCSI_CAP_GENERIC].cap;
750 if (!(cap & NCSI_CAP_GENERIC_HWA) ||
751 (cap & NCSI_CAP_GENERIC_HWA_MASK) !=
752 NCSI_CAP_GENERIC_HWA_SUPPORT) {
753 ndp->flags &= ~NCSI_DEV_HWA;
754 return false;
755 }
756 }
757 }
758
759 ndp->flags |= NCSI_DEV_HWA;
760 return true;
761 }
762
763 static int ncsi_enable_hwa(struct ncsi_dev_priv *ndp)
764 {
765 struct ncsi_package *np;
766 struct ncsi_channel *nc;
767 unsigned long flags;
768
769 /* Move all available channels to processing queue */
770 spin_lock_irqsave(&ndp->lock, flags);
771 NCSI_FOR_EACH_PACKAGE(ndp, np) {
772 NCSI_FOR_EACH_CHANNEL(np, nc) {
773 WARN_ON_ONCE(nc->state != NCSI_CHANNEL_INACTIVE ||
774 !list_empty(&nc->link));
775 ncsi_stop_channel_monitor(nc);
776 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
777 }
778 }
779 spin_unlock_irqrestore(&ndp->lock, flags);
780
781 /* We can have no channels in extremely case */
782 if (list_empty(&ndp->channel_queue)) {
783 ncsi_report_link(ndp, false);
784 return -ENOENT;
785 }
786
787 return ncsi_process_next_channel(ndp);
788 }
789
790 static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
791 {
792 struct ncsi_dev *nd = &ndp->ndev;
793 struct ncsi_package *np;
794 struct ncsi_channel *nc;
795 struct ncsi_cmd_arg nca;
796 unsigned char index;
797 int ret;
798
799 nca.ndp = ndp;
800 nca.driven = true;
801 switch (nd->state) {
802 case ncsi_dev_state_probe:
803 nd->state = ncsi_dev_state_probe_deselect;
804 /* Fall through */
805 case ncsi_dev_state_probe_deselect:
806 ndp->pending_req_num = 8;
807
808 /* Deselect all possible packages */
809 nca.type = NCSI_PKT_CMD_DP;
810 nca.channel = 0x1f;
811 for (index = 0; index < 8; index++) {
812 nca.package = index;
813 ret = ncsi_xmit_cmd(&nca);
814 if (ret)
815 goto error;
816 }
817
818 nd->state = ncsi_dev_state_probe_package;
819 break;
820 case ncsi_dev_state_probe_package:
821 ndp->pending_req_num = 16;
822
823 /* Select all possible packages */
824 nca.type = NCSI_PKT_CMD_SP;
825 nca.bytes[0] = 1;
826 nca.channel = 0x1f;
827 for (index = 0; index < 8; index++) {
828 nca.package = index;
829 ret = ncsi_xmit_cmd(&nca);
830 if (ret)
831 goto error;
832 }
833
834 /* Disable all possible packages */
835 nca.type = NCSI_PKT_CMD_DP;
836 for (index = 0; index < 8; index++) {
837 nca.package = index;
838 ret = ncsi_xmit_cmd(&nca);
839 if (ret)
840 goto error;
841 }
842
843 nd->state = ncsi_dev_state_probe_channel;
844 break;
845 case ncsi_dev_state_probe_channel:
846 if (!ndp->active_package)
847 ndp->active_package = list_first_or_null_rcu(
848 &ndp->packages, struct ncsi_package, node);
849 else if (list_is_last(&ndp->active_package->node,
850 &ndp->packages))
851 ndp->active_package = NULL;
852 else
853 ndp->active_package = list_next_entry(
854 ndp->active_package, node);
855
856 /* All available packages and channels are enumerated. The
857 * enumeration happens for once when the NCSI interface is
858 * started. So we need continue to start the interface after
859 * the enumeration.
860 *
861 * We have to choose an active channel before configuring it.
862 * Note that we possibly don't have active channel in extreme
863 * situation.
864 */
865 if (!ndp->active_package) {
866 ndp->flags |= NCSI_DEV_PROBED;
867 if (ncsi_check_hwa(ndp))
868 ncsi_enable_hwa(ndp);
869 else
870 ncsi_choose_active_channel(ndp);
871 return;
872 }
873
874 /* Select the active package */
875 ndp->pending_req_num = 1;
876 nca.type = NCSI_PKT_CMD_SP;
877 nca.bytes[0] = 1;
878 nca.package = ndp->active_package->id;
879 nca.channel = 0x1f;
880 ret = ncsi_xmit_cmd(&nca);
881 if (ret)
882 goto error;
883
884 nd->state = ncsi_dev_state_probe_cis;
885 break;
886 case ncsi_dev_state_probe_cis:
887 ndp->pending_req_num = 32;
888
889 /* Clear initial state */
890 nca.type = NCSI_PKT_CMD_CIS;
891 nca.package = ndp->active_package->id;
892 for (index = 0; index < 0x20; index++) {
893 nca.channel = index;
894 ret = ncsi_xmit_cmd(&nca);
895 if (ret)
896 goto error;
897 }
898
899 nd->state = ncsi_dev_state_probe_gvi;
900 break;
901 case ncsi_dev_state_probe_gvi:
902 case ncsi_dev_state_probe_gc:
903 case ncsi_dev_state_probe_gls:
904 np = ndp->active_package;
905 ndp->pending_req_num = np->channel_num;
906
907 /* Retrieve version, capability or link status */
908 if (nd->state == ncsi_dev_state_probe_gvi)
909 nca.type = NCSI_PKT_CMD_GVI;
910 else if (nd->state == ncsi_dev_state_probe_gc)
911 nca.type = NCSI_PKT_CMD_GC;
912 else
913 nca.type = NCSI_PKT_CMD_GLS;
914
915 nca.package = np->id;
916 NCSI_FOR_EACH_CHANNEL(np, nc) {
917 nca.channel = nc->id;
918 ret = ncsi_xmit_cmd(&nca);
919 if (ret)
920 goto error;
921 }
922
923 if (nd->state == ncsi_dev_state_probe_gvi)
924 nd->state = ncsi_dev_state_probe_gc;
925 else if (nd->state == ncsi_dev_state_probe_gc)
926 nd->state = ncsi_dev_state_probe_gls;
927 else
928 nd->state = ncsi_dev_state_probe_dp;
929 break;
930 case ncsi_dev_state_probe_dp:
931 ndp->pending_req_num = 1;
932
933 /* Deselect the active package */
934 nca.type = NCSI_PKT_CMD_DP;
935 nca.package = ndp->active_package->id;
936 nca.channel = 0x1f;
937 ret = ncsi_xmit_cmd(&nca);
938 if (ret)
939 goto error;
940
941 /* Scan channels in next package */
942 nd->state = ncsi_dev_state_probe_channel;
943 break;
944 default:
945 netdev_warn(nd->dev, "Wrong NCSI state 0x%0x in enumeration\n",
946 nd->state);
947 }
948
949 return;
950 error:
951 ncsi_report_link(ndp, true);
952 }
953
954 static void ncsi_dev_work(struct work_struct *work)
955 {
956 struct ncsi_dev_priv *ndp = container_of(work,
957 struct ncsi_dev_priv, work);
958 struct ncsi_dev *nd = &ndp->ndev;
959
960 switch (nd->state & ncsi_dev_state_major) {
961 case ncsi_dev_state_probe:
962 ncsi_probe_channel(ndp);
963 break;
964 case ncsi_dev_state_suspend:
965 ncsi_suspend_channel(ndp);
966 break;
967 case ncsi_dev_state_config:
968 ncsi_configure_channel(ndp);
969 break;
970 default:
971 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in workqueue\n",
972 nd->state);
973 }
974 }
975
976 int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
977 {
978 struct ncsi_channel *nc;
979 int old_state;
980 unsigned long flags;
981
982 spin_lock_irqsave(&ndp->lock, flags);
983 nc = list_first_or_null_rcu(&ndp->channel_queue,
984 struct ncsi_channel, link);
985 if (nc) {
986 old_state = xchg(&nc->state, NCSI_CHANNEL_INVISIBLE);
987 list_del_init(&nc->link);
988 }
989 spin_unlock_irqrestore(&ndp->lock, flags);
990
991 ndp->active_channel = nc;
992 ndp->active_package = nc ? nc->package : NULL;
993 if (!nc) {
994 if (ndp->flags & NCSI_DEV_RESHUFFLE) {
995 ndp->flags &= ~NCSI_DEV_RESHUFFLE;
996 return ncsi_choose_active_channel(ndp);
997 }
998
999 ncsi_report_link(ndp, false);
1000 return -ENODEV;
1001 }
1002
1003 switch (old_state) {
1004 case NCSI_CHANNEL_INACTIVE:
1005 ndp->ndev.state = ncsi_dev_state_config;
1006 ncsi_configure_channel(ndp);
1007 break;
1008 case NCSI_CHANNEL_ACTIVE:
1009 ndp->ndev.state = ncsi_dev_state_suspend;
1010 ncsi_suspend_channel(ndp);
1011 break;
1012 default:
1013 netdev_err(ndp->ndev.dev, "Invalid state 0x%x on %d:%d\n",
1014 nc->state, nc->package->id, nc->id);
1015 ncsi_report_link(ndp, false);
1016 return -EINVAL;
1017 }
1018
1019 return 0;
1020 }
1021
1022 #if IS_ENABLED(CONFIG_IPV6)
1023 static int ncsi_inet6addr_event(struct notifier_block *this,
1024 unsigned long event, void *data)
1025 {
1026 struct inet6_ifaddr *ifa = data;
1027 struct net_device *dev = ifa->idev->dev;
1028 struct ncsi_dev *nd = ncsi_find_dev(dev);
1029 struct ncsi_dev_priv *ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
1030 struct ncsi_package *np;
1031 struct ncsi_channel *nc;
1032 struct ncsi_cmd_arg nca;
1033 bool action;
1034 int ret;
1035
1036 if (!ndp || (ipv6_addr_type(&ifa->addr) &
1037 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)))
1038 return NOTIFY_OK;
1039
1040 switch (event) {
1041 case NETDEV_UP:
1042 action = (++ndp->inet6_addr_num) == 1;
1043 nca.type = NCSI_PKT_CMD_EGMF;
1044 break;
1045 case NETDEV_DOWN:
1046 action = (--ndp->inet6_addr_num == 0);
1047 nca.type = NCSI_PKT_CMD_DGMF;
1048 break;
1049 default:
1050 return NOTIFY_OK;
1051 }
1052
1053 /* We might not have active channel or packages. The IPv6
1054 * required multicast will be enabled when active channel
1055 * or packages are chosen.
1056 */
1057 np = ndp->active_package;
1058 nc = ndp->active_channel;
1059 if (!action || !np || !nc)
1060 return NOTIFY_OK;
1061
1062 /* We needn't enable or disable it if the function isn't supported */
1063 if (!(nc->caps[NCSI_CAP_GENERIC].cap & NCSI_CAP_GENERIC_MC))
1064 return NOTIFY_OK;
1065
1066 nca.ndp = ndp;
1067 nca.driven = false;
1068 nca.package = np->id;
1069 nca.channel = nc->id;
1070 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
1071 ret = ncsi_xmit_cmd(&nca);
1072 if (ret) {
1073 netdev_warn(dev, "Fail to %s global multicast filter (%d)\n",
1074 (event == NETDEV_UP) ? "enable" : "disable", ret);
1075 return NOTIFY_DONE;
1076 }
1077
1078 return NOTIFY_OK;
1079 }
1080
1081 static struct notifier_block ncsi_inet6addr_notifier = {
1082 .notifier_call = ncsi_inet6addr_event,
1083 };
1084 #endif /* CONFIG_IPV6 */
1085
1086 struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
1087 void (*handler)(struct ncsi_dev *ndev))
1088 {
1089 struct ncsi_dev_priv *ndp;
1090 struct ncsi_dev *nd;
1091 unsigned long flags;
1092 int i;
1093
1094 /* Check if the device has been registered or not */
1095 nd = ncsi_find_dev(dev);
1096 if (nd)
1097 return nd;
1098
1099 /* Create NCSI device */
1100 ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
1101 if (!ndp)
1102 return NULL;
1103
1104 nd = &ndp->ndev;
1105 nd->state = ncsi_dev_state_registered;
1106 nd->dev = dev;
1107 nd->handler = handler;
1108 ndp->pending_req_num = 0;
1109 INIT_LIST_HEAD(&ndp->channel_queue);
1110 INIT_WORK(&ndp->work, ncsi_dev_work);
1111
1112 /* Initialize private NCSI device */
1113 spin_lock_init(&ndp->lock);
1114 INIT_LIST_HEAD(&ndp->packages);
1115 ndp->request_id = 0;
1116 for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
1117 ndp->requests[i].id = i;
1118 ndp->requests[i].ndp = ndp;
1119 setup_timer(&ndp->requests[i].timer,
1120 ncsi_request_timeout,
1121 (unsigned long)&ndp->requests[i]);
1122 }
1123
1124 spin_lock_irqsave(&ncsi_dev_lock, flags);
1125 #if IS_ENABLED(CONFIG_IPV6)
1126 ndp->inet6_addr_num = 0;
1127 if (list_empty(&ncsi_dev_list))
1128 register_inet6addr_notifier(&ncsi_inet6addr_notifier);
1129 #endif
1130 list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
1131 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1132
1133 /* Register NCSI packet Rx handler */
1134 ndp->ptype.type = cpu_to_be16(ETH_P_NCSI);
1135 ndp->ptype.func = ncsi_rcv_rsp;
1136 ndp->ptype.dev = dev;
1137 dev_add_pack(&ndp->ptype);
1138
1139 return nd;
1140 }
1141 EXPORT_SYMBOL_GPL(ncsi_register_dev);
1142
1143 int ncsi_start_dev(struct ncsi_dev *nd)
1144 {
1145 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1146 struct ncsi_package *np;
1147 struct ncsi_channel *nc;
1148 int old_state, ret;
1149
1150 if (nd->state != ncsi_dev_state_registered &&
1151 nd->state != ncsi_dev_state_functional)
1152 return -ENOTTY;
1153
1154 if (!(ndp->flags & NCSI_DEV_PROBED)) {
1155 nd->state = ncsi_dev_state_probe;
1156 schedule_work(&ndp->work);
1157 return 0;
1158 }
1159
1160 /* Reset channel's state and start over */
1161 NCSI_FOR_EACH_PACKAGE(ndp, np) {
1162 NCSI_FOR_EACH_CHANNEL(np, nc) {
1163 old_state = xchg(&nc->state, NCSI_CHANNEL_INACTIVE);
1164 WARN_ON_ONCE(!list_empty(&nc->link) ||
1165 old_state == NCSI_CHANNEL_INVISIBLE);
1166 }
1167 }
1168
1169 if (ndp->flags & NCSI_DEV_HWA)
1170 ret = ncsi_enable_hwa(ndp);
1171 else
1172 ret = ncsi_choose_active_channel(ndp);
1173
1174 return ret;
1175 }
1176 EXPORT_SYMBOL_GPL(ncsi_start_dev);
1177
1178 void ncsi_unregister_dev(struct ncsi_dev *nd)
1179 {
1180 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1181 struct ncsi_package *np, *tmp;
1182 unsigned long flags;
1183
1184 dev_remove_pack(&ndp->ptype);
1185
1186 list_for_each_entry_safe(np, tmp, &ndp->packages, node)
1187 ncsi_remove_package(np);
1188
1189 spin_lock_irqsave(&ncsi_dev_lock, flags);
1190 list_del_rcu(&ndp->node);
1191 #if IS_ENABLED(CONFIG_IPV6)
1192 if (list_empty(&ncsi_dev_list))
1193 unregister_inet6addr_notifier(&ncsi_inet6addr_notifier);
1194 #endif
1195 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1196
1197 kfree(ndp);
1198 }
1199 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
Linux kernel - Deliverables
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