xref: /openbmc/linux/net/ncsi/ncsi-manage.c (revision b868a02e)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright Gavin Shan, IBM Corporation 2016.
4  */
5 
6 #include <linux/module.h>
7 #include <linux/kernel.h>
8 #include <linux/init.h>
9 #include <linux/netdevice.h>
10 #include <linux/skbuff.h>
11 #include <linux/of.h>
12 #include <linux/platform_device.h>
13 
14 #include <net/ncsi.h>
15 #include <net/net_namespace.h>
16 #include <net/sock.h>
17 #include <net/addrconf.h>
18 #include <net/ipv6.h>
19 #include <net/genetlink.h>
20 
21 #include "internal.h"
22 #include "ncsi-pkt.h"
23 #include "ncsi-netlink.h"
24 
25 LIST_HEAD(ncsi_dev_list);
26 DEFINE_SPINLOCK(ncsi_dev_lock);
27 
28 bool ncsi_channel_has_link(struct ncsi_channel *channel)
29 {
30 	return !!(channel->modes[NCSI_MODE_LINK].data[2] & 0x1);
31 }
32 
33 bool ncsi_channel_is_last(struct ncsi_dev_priv *ndp,
34 			  struct ncsi_channel *channel)
35 {
36 	struct ncsi_package *np;
37 	struct ncsi_channel *nc;
38 
39 	NCSI_FOR_EACH_PACKAGE(ndp, np)
40 		NCSI_FOR_EACH_CHANNEL(np, nc) {
41 			if (nc == channel)
42 				continue;
43 			if (nc->state == NCSI_CHANNEL_ACTIVE &&
44 			    ncsi_channel_has_link(nc))
45 				return false;
46 		}
47 
48 	return true;
49 }
50 
51 static void ncsi_report_link(struct ncsi_dev_priv *ndp, bool force_down)
52 {
53 	struct ncsi_dev *nd = &ndp->ndev;
54 	struct ncsi_package *np;
55 	struct ncsi_channel *nc;
56 	unsigned long flags;
57 
58 	nd->state = ncsi_dev_state_functional;
59 	if (force_down) {
60 		nd->link_up = 0;
61 		goto report;
62 	}
63 
64 	nd->link_up = 0;
65 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
66 		NCSI_FOR_EACH_CHANNEL(np, nc) {
67 			spin_lock_irqsave(&nc->lock, flags);
68 
69 			if (!list_empty(&nc->link) ||
70 			    nc->state != NCSI_CHANNEL_ACTIVE) {
71 				spin_unlock_irqrestore(&nc->lock, flags);
72 				continue;
73 			}
74 
75 			if (ncsi_channel_has_link(nc)) {
76 				spin_unlock_irqrestore(&nc->lock, flags);
77 				nd->link_up = 1;
78 				goto report;
79 			}
80 
81 			spin_unlock_irqrestore(&nc->lock, flags);
82 		}
83 	}
84 
85 report:
86 	nd->handler(nd);
87 }
88 
89 static void ncsi_channel_monitor(struct timer_list *t)
90 {
91 	struct ncsi_channel *nc = from_timer(nc, t, monitor.timer);
92 	struct ncsi_package *np = nc->package;
93 	struct ncsi_dev_priv *ndp = np->ndp;
94 	struct ncsi_channel_mode *ncm;
95 	struct ncsi_cmd_arg nca;
96 	bool enabled, chained;
97 	unsigned int monitor_state;
98 	unsigned long flags;
99 	int state, ret;
100 
101 	spin_lock_irqsave(&nc->lock, flags);
102 	state = nc->state;
103 	chained = !list_empty(&nc->link);
104 	enabled = nc->monitor.enabled;
105 	monitor_state = nc->monitor.state;
106 	spin_unlock_irqrestore(&nc->lock, flags);
107 
108 	if (!enabled)
109 		return;		/* expected race disabling timer */
110 	if (WARN_ON_ONCE(chained))
111 		goto bad_state;
112 
113 	if (state != NCSI_CHANNEL_INACTIVE &&
114 	    state != NCSI_CHANNEL_ACTIVE) {
115 bad_state:
116 		netdev_warn(ndp->ndev.dev,
117 			    "Bad NCSI monitor state channel %d 0x%x %s queue\n",
118 			    nc->id, state, chained ? "on" : "off");
119 		spin_lock_irqsave(&nc->lock, flags);
120 		nc->monitor.enabled = false;
121 		spin_unlock_irqrestore(&nc->lock, flags);
122 		return;
123 	}
124 
125 	switch (monitor_state) {
126 	case NCSI_CHANNEL_MONITOR_START:
127 	case NCSI_CHANNEL_MONITOR_RETRY:
128 		nca.ndp = ndp;
129 		nca.package = np->id;
130 		nca.channel = nc->id;
131 		nca.type = NCSI_PKT_CMD_GLS;
132 		nca.req_flags = 0;
133 		ret = ncsi_xmit_cmd(&nca);
134 		if (ret)
135 			netdev_err(ndp->ndev.dev, "Error %d sending GLS\n",
136 				   ret);
137 		break;
138 	case NCSI_CHANNEL_MONITOR_WAIT ... NCSI_CHANNEL_MONITOR_WAIT_MAX:
139 		break;
140 	default:
141 		netdev_err(ndp->ndev.dev, "NCSI Channel %d timed out!\n",
142 			   nc->id);
143 		ncsi_report_link(ndp, true);
144 		ndp->flags |= NCSI_DEV_RESHUFFLE;
145 
146 		ncm = &nc->modes[NCSI_MODE_LINK];
147 		spin_lock_irqsave(&nc->lock, flags);
148 		nc->monitor.enabled = false;
149 		nc->state = NCSI_CHANNEL_INVISIBLE;
150 		ncm->data[2] &= ~0x1;
151 		spin_unlock_irqrestore(&nc->lock, flags);
152 
153 		spin_lock_irqsave(&ndp->lock, flags);
154 		nc->state = NCSI_CHANNEL_ACTIVE;
155 		list_add_tail_rcu(&nc->link, &ndp->channel_queue);
156 		spin_unlock_irqrestore(&ndp->lock, flags);
157 		ncsi_process_next_channel(ndp);
158 		return;
159 	}
160 
161 	spin_lock_irqsave(&nc->lock, flags);
162 	nc->monitor.state++;
163 	spin_unlock_irqrestore(&nc->lock, flags);
164 	mod_timer(&nc->monitor.timer, jiffies + HZ);
165 }
166 
167 void ncsi_start_channel_monitor(struct ncsi_channel *nc)
168 {
169 	unsigned long flags;
170 
171 	spin_lock_irqsave(&nc->lock, flags);
172 	WARN_ON_ONCE(nc->monitor.enabled);
173 	nc->monitor.enabled = true;
174 	nc->monitor.state = NCSI_CHANNEL_MONITOR_START;
175 	spin_unlock_irqrestore(&nc->lock, flags);
176 
177 	mod_timer(&nc->monitor.timer, jiffies + HZ);
178 }
179 
180 void ncsi_stop_channel_monitor(struct ncsi_channel *nc)
181 {
182 	unsigned long flags;
183 
184 	spin_lock_irqsave(&nc->lock, flags);
185 	if (!nc->monitor.enabled) {
186 		spin_unlock_irqrestore(&nc->lock, flags);
187 		return;
188 	}
189 	nc->monitor.enabled = false;
190 	spin_unlock_irqrestore(&nc->lock, flags);
191 
192 	del_timer_sync(&nc->monitor.timer);
193 }
194 
195 struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
196 				       unsigned char id)
197 {
198 	struct ncsi_channel *nc;
199 
200 	NCSI_FOR_EACH_CHANNEL(np, nc) {
201 		if (nc->id == id)
202 			return nc;
203 	}
204 
205 	return NULL;
206 }
207 
208 struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
209 {
210 	struct ncsi_channel *nc, *tmp;
211 	int index;
212 	unsigned long flags;
213 
214 	nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
215 	if (!nc)
216 		return NULL;
217 
218 	nc->id = id;
219 	nc->package = np;
220 	nc->state = NCSI_CHANNEL_INACTIVE;
221 	nc->monitor.enabled = false;
222 	timer_setup(&nc->monitor.timer, ncsi_channel_monitor, 0);
223 	spin_lock_init(&nc->lock);
224 	INIT_LIST_HEAD(&nc->link);
225 	for (index = 0; index < NCSI_CAP_MAX; index++)
226 		nc->caps[index].index = index;
227 	for (index = 0; index < NCSI_MODE_MAX; index++)
228 		nc->modes[index].index = index;
229 
230 	spin_lock_irqsave(&np->lock, flags);
231 	tmp = ncsi_find_channel(np, id);
232 	if (tmp) {
233 		spin_unlock_irqrestore(&np->lock, flags);
234 		kfree(nc);
235 		return tmp;
236 	}
237 
238 	list_add_tail_rcu(&nc->node, &np->channels);
239 	np->channel_num++;
240 	spin_unlock_irqrestore(&np->lock, flags);
241 
242 	return nc;
243 }
244 
245 static void ncsi_remove_channel(struct ncsi_channel *nc)
246 {
247 	struct ncsi_package *np = nc->package;
248 	unsigned long flags;
249 
250 	spin_lock_irqsave(&nc->lock, flags);
251 
252 	/* Release filters */
253 	kfree(nc->mac_filter.addrs);
254 	kfree(nc->vlan_filter.vids);
255 
256 	nc->state = NCSI_CHANNEL_INACTIVE;
257 	spin_unlock_irqrestore(&nc->lock, flags);
258 	ncsi_stop_channel_monitor(nc);
259 
260 	/* Remove and free channel */
261 	spin_lock_irqsave(&np->lock, flags);
262 	list_del_rcu(&nc->node);
263 	np->channel_num--;
264 	spin_unlock_irqrestore(&np->lock, flags);
265 
266 	kfree(nc);
267 }
268 
269 struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
270 				       unsigned char id)
271 {
272 	struct ncsi_package *np;
273 
274 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
275 		if (np->id == id)
276 			return np;
277 	}
278 
279 	return NULL;
280 }
281 
282 struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
283 				      unsigned char id)
284 {
285 	struct ncsi_package *np, *tmp;
286 	unsigned long flags;
287 
288 	np = kzalloc(sizeof(*np), GFP_ATOMIC);
289 	if (!np)
290 		return NULL;
291 
292 	np->id = id;
293 	np->ndp = ndp;
294 	spin_lock_init(&np->lock);
295 	INIT_LIST_HEAD(&np->channels);
296 	np->channel_whitelist = UINT_MAX;
297 
298 	spin_lock_irqsave(&ndp->lock, flags);
299 	tmp = ncsi_find_package(ndp, id);
300 	if (tmp) {
301 		spin_unlock_irqrestore(&ndp->lock, flags);
302 		kfree(np);
303 		return tmp;
304 	}
305 
306 	list_add_tail_rcu(&np->node, &ndp->packages);
307 	ndp->package_num++;
308 	spin_unlock_irqrestore(&ndp->lock, flags);
309 
310 	return np;
311 }
312 
313 void ncsi_remove_package(struct ncsi_package *np)
314 {
315 	struct ncsi_dev_priv *ndp = np->ndp;
316 	struct ncsi_channel *nc, *tmp;
317 	unsigned long flags;
318 
319 	/* Release all child channels */
320 	list_for_each_entry_safe(nc, tmp, &np->channels, node)
321 		ncsi_remove_channel(nc);
322 
323 	/* Remove and free package */
324 	spin_lock_irqsave(&ndp->lock, flags);
325 	list_del_rcu(&np->node);
326 	ndp->package_num--;
327 	spin_unlock_irqrestore(&ndp->lock, flags);
328 
329 	kfree(np);
330 }
331 
332 void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
333 				   unsigned char id,
334 				   struct ncsi_package **np,
335 				   struct ncsi_channel **nc)
336 {
337 	struct ncsi_package *p;
338 	struct ncsi_channel *c;
339 
340 	p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
341 	c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;
342 
343 	if (np)
344 		*np = p;
345 	if (nc)
346 		*nc = c;
347 }
348 
349 /* For two consecutive NCSI commands, the packet IDs shouldn't
350  * be same. Otherwise, the bogus response might be replied. So
351  * the available IDs are allocated in round-robin fashion.
352  */
353 struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp,
354 					unsigned int req_flags)
355 {
356 	struct ncsi_request *nr = NULL;
357 	int i, limit = ARRAY_SIZE(ndp->requests);
358 	unsigned long flags;
359 
360 	/* Check if there is one available request until the ceiling */
361 	spin_lock_irqsave(&ndp->lock, flags);
362 	for (i = ndp->request_id; i < limit; i++) {
363 		if (ndp->requests[i].used)
364 			continue;
365 
366 		nr = &ndp->requests[i];
367 		nr->used = true;
368 		nr->flags = req_flags;
369 		ndp->request_id = i + 1;
370 		goto found;
371 	}
372 
373 	/* Fail back to check from the starting cursor */
374 	for (i = NCSI_REQ_START_IDX; i < ndp->request_id; i++) {
375 		if (ndp->requests[i].used)
376 			continue;
377 
378 		nr = &ndp->requests[i];
379 		nr->used = true;
380 		nr->flags = req_flags;
381 		ndp->request_id = i + 1;
382 		goto found;
383 	}
384 
385 found:
386 	spin_unlock_irqrestore(&ndp->lock, flags);
387 	return nr;
388 }
389 
390 void ncsi_free_request(struct ncsi_request *nr)
391 {
392 	struct ncsi_dev_priv *ndp = nr->ndp;
393 	struct sk_buff *cmd, *rsp;
394 	unsigned long flags;
395 	bool driven;
396 
397 	if (nr->enabled) {
398 		nr->enabled = false;
399 		del_timer_sync(&nr->timer);
400 	}
401 
402 	spin_lock_irqsave(&ndp->lock, flags);
403 	cmd = nr->cmd;
404 	rsp = nr->rsp;
405 	nr->cmd = NULL;
406 	nr->rsp = NULL;
407 	nr->used = false;
408 	driven = !!(nr->flags & NCSI_REQ_FLAG_EVENT_DRIVEN);
409 	spin_unlock_irqrestore(&ndp->lock, flags);
410 
411 	if (driven && cmd && --ndp->pending_req_num == 0)
412 		schedule_work(&ndp->work);
413 
414 	/* Release command and response */
415 	consume_skb(cmd);
416 	consume_skb(rsp);
417 }
418 
419 struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
420 {
421 	struct ncsi_dev_priv *ndp;
422 
423 	NCSI_FOR_EACH_DEV(ndp) {
424 		if (ndp->ndev.dev == dev)
425 			return &ndp->ndev;
426 	}
427 
428 	return NULL;
429 }
430 
431 static void ncsi_request_timeout(struct timer_list *t)
432 {
433 	struct ncsi_request *nr = from_timer(nr, t, timer);
434 	struct ncsi_dev_priv *ndp = nr->ndp;
435 	struct ncsi_cmd_pkt *cmd;
436 	struct ncsi_package *np;
437 	struct ncsi_channel *nc;
438 	unsigned long flags;
439 
440 	/* If the request already had associated response,
441 	 * let the response handler to release it.
442 	 */
443 	spin_lock_irqsave(&ndp->lock, flags);
444 	nr->enabled = false;
445 	if (nr->rsp || !nr->cmd) {
446 		spin_unlock_irqrestore(&ndp->lock, flags);
447 		return;
448 	}
449 	spin_unlock_irqrestore(&ndp->lock, flags);
450 
451 	if (nr->flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) {
452 		if (nr->cmd) {
453 			/* Find the package */
454 			cmd = (struct ncsi_cmd_pkt *)
455 			      skb_network_header(nr->cmd);
456 			ncsi_find_package_and_channel(ndp,
457 						      cmd->cmd.common.channel,
458 						      &np, &nc);
459 			ncsi_send_netlink_timeout(nr, np, nc);
460 		}
461 	}
462 
463 	/* Release the request */
464 	ncsi_free_request(nr);
465 }
466 
467 static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
468 {
469 	struct ncsi_dev *nd = &ndp->ndev;
470 	struct ncsi_package *np;
471 	struct ncsi_channel *nc, *tmp;
472 	struct ncsi_cmd_arg nca;
473 	unsigned long flags;
474 	int ret;
475 
476 	np = ndp->active_package;
477 	nc = ndp->active_channel;
478 	nca.ndp = ndp;
479 	nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
480 	switch (nd->state) {
481 	case ncsi_dev_state_suspend:
482 		nd->state = ncsi_dev_state_suspend_select;
483 		fallthrough;
484 	case ncsi_dev_state_suspend_select:
485 		ndp->pending_req_num = 1;
486 
487 		nca.type = NCSI_PKT_CMD_SP;
488 		nca.package = np->id;
489 		nca.channel = NCSI_RESERVED_CHANNEL;
490 		if (ndp->flags & NCSI_DEV_HWA)
491 			nca.bytes[0] = 0;
492 		else
493 			nca.bytes[0] = 1;
494 
495 		/* To retrieve the last link states of channels in current
496 		 * package when current active channel needs fail over to
497 		 * another one. It means we will possibly select another
498 		 * channel as next active one. The link states of channels
499 		 * are most important factor of the selection. So we need
500 		 * accurate link states. Unfortunately, the link states on
501 		 * inactive channels can't be updated with LSC AEN in time.
502 		 */
503 		if (ndp->flags & NCSI_DEV_RESHUFFLE)
504 			nd->state = ncsi_dev_state_suspend_gls;
505 		else
506 			nd->state = ncsi_dev_state_suspend_dcnt;
507 		ret = ncsi_xmit_cmd(&nca);
508 		if (ret)
509 			goto error;
510 
511 		break;
512 	case ncsi_dev_state_suspend_gls:
513 		ndp->pending_req_num = np->channel_num;
514 
515 		nca.type = NCSI_PKT_CMD_GLS;
516 		nca.package = np->id;
517 
518 		nd->state = ncsi_dev_state_suspend_dcnt;
519 		NCSI_FOR_EACH_CHANNEL(np, nc) {
520 			nca.channel = nc->id;
521 			ret = ncsi_xmit_cmd(&nca);
522 			if (ret)
523 				goto error;
524 		}
525 
526 		break;
527 	case ncsi_dev_state_suspend_dcnt:
528 		ndp->pending_req_num = 1;
529 
530 		nca.type = NCSI_PKT_CMD_DCNT;
531 		nca.package = np->id;
532 		nca.channel = nc->id;
533 
534 		nd->state = ncsi_dev_state_suspend_dc;
535 		ret = ncsi_xmit_cmd(&nca);
536 		if (ret)
537 			goto error;
538 
539 		break;
540 	case ncsi_dev_state_suspend_dc:
541 		ndp->pending_req_num = 1;
542 
543 		nca.type = NCSI_PKT_CMD_DC;
544 		nca.package = np->id;
545 		nca.channel = nc->id;
546 		nca.bytes[0] = 1;
547 
548 		nd->state = ncsi_dev_state_suspend_deselect;
549 		ret = ncsi_xmit_cmd(&nca);
550 		if (ret)
551 			goto error;
552 
553 		NCSI_FOR_EACH_CHANNEL(np, tmp) {
554 			/* If there is another channel active on this package
555 			 * do not deselect the package.
556 			 */
557 			if (tmp != nc && tmp->state == NCSI_CHANNEL_ACTIVE) {
558 				nd->state = ncsi_dev_state_suspend_done;
559 				break;
560 			}
561 		}
562 		break;
563 	case ncsi_dev_state_suspend_deselect:
564 		ndp->pending_req_num = 1;
565 
566 		nca.type = NCSI_PKT_CMD_DP;
567 		nca.package = np->id;
568 		nca.channel = NCSI_RESERVED_CHANNEL;
569 
570 		nd->state = ncsi_dev_state_suspend_done;
571 		ret = ncsi_xmit_cmd(&nca);
572 		if (ret)
573 			goto error;
574 
575 		break;
576 	case ncsi_dev_state_suspend_done:
577 		spin_lock_irqsave(&nc->lock, flags);
578 		nc->state = NCSI_CHANNEL_INACTIVE;
579 		spin_unlock_irqrestore(&nc->lock, flags);
580 		if (ndp->flags & NCSI_DEV_RESET)
581 			ncsi_reset_dev(nd);
582 		else
583 			ncsi_process_next_channel(ndp);
584 		break;
585 	default:
586 		netdev_warn(nd->dev, "Wrong NCSI state 0x%x in suspend\n",
587 			    nd->state);
588 	}
589 
590 	return;
591 error:
592 	nd->state = ncsi_dev_state_functional;
593 }
594 
595 /* Check the VLAN filter bitmap for a set filter, and construct a
596  * "Set VLAN Filter - Disable" packet if found.
597  */
598 static int clear_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
599 			 struct ncsi_cmd_arg *nca)
600 {
601 	struct ncsi_channel_vlan_filter *ncf;
602 	unsigned long flags;
603 	void *bitmap;
604 	int index;
605 	u16 vid;
606 
607 	ncf = &nc->vlan_filter;
608 	bitmap = &ncf->bitmap;
609 
610 	spin_lock_irqsave(&nc->lock, flags);
611 	index = find_first_bit(bitmap, ncf->n_vids);
612 	if (index >= ncf->n_vids) {
613 		spin_unlock_irqrestore(&nc->lock, flags);
614 		return -1;
615 	}
616 	vid = ncf->vids[index];
617 
618 	clear_bit(index, bitmap);
619 	ncf->vids[index] = 0;
620 	spin_unlock_irqrestore(&nc->lock, flags);
621 
622 	nca->type = NCSI_PKT_CMD_SVF;
623 	nca->words[1] = vid;
624 	/* HW filter index starts at 1 */
625 	nca->bytes[6] = index + 1;
626 	nca->bytes[7] = 0x00;
627 	return 0;
628 }
629 
630 /* Find an outstanding VLAN tag and construct a "Set VLAN Filter - Enable"
631  * packet.
632  */
633 static int set_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
634 		       struct ncsi_cmd_arg *nca)
635 {
636 	struct ncsi_channel_vlan_filter *ncf;
637 	struct vlan_vid *vlan = NULL;
638 	unsigned long flags;
639 	int i, index;
640 	void *bitmap;
641 	u16 vid;
642 
643 	if (list_empty(&ndp->vlan_vids))
644 		return -1;
645 
646 	ncf = &nc->vlan_filter;
647 	bitmap = &ncf->bitmap;
648 
649 	spin_lock_irqsave(&nc->lock, flags);
650 
651 	rcu_read_lock();
652 	list_for_each_entry_rcu(vlan, &ndp->vlan_vids, list) {
653 		vid = vlan->vid;
654 		for (i = 0; i < ncf->n_vids; i++)
655 			if (ncf->vids[i] == vid) {
656 				vid = 0;
657 				break;
658 			}
659 		if (vid)
660 			break;
661 	}
662 	rcu_read_unlock();
663 
664 	if (!vid) {
665 		/* No VLAN ID is not set */
666 		spin_unlock_irqrestore(&nc->lock, flags);
667 		return -1;
668 	}
669 
670 	index = find_first_zero_bit(bitmap, ncf->n_vids);
671 	if (index < 0 || index >= ncf->n_vids) {
672 		netdev_err(ndp->ndev.dev,
673 			   "Channel %u already has all VLAN filters set\n",
674 			   nc->id);
675 		spin_unlock_irqrestore(&nc->lock, flags);
676 		return -1;
677 	}
678 
679 	ncf->vids[index] = vid;
680 	set_bit(index, bitmap);
681 	spin_unlock_irqrestore(&nc->lock, flags);
682 
683 	nca->type = NCSI_PKT_CMD_SVF;
684 	nca->words[1] = vid;
685 	/* HW filter index starts at 1 */
686 	nca->bytes[6] = index + 1;
687 	nca->bytes[7] = 0x01;
688 
689 	return 0;
690 }
691 
692 #if IS_ENABLED(CONFIG_NCSI_OEM_CMD_KEEP_PHY)
693 
694 static int ncsi_oem_keep_phy_intel(struct ncsi_cmd_arg *nca)
695 {
696 	unsigned char data[NCSI_OEM_INTEL_CMD_KEEP_PHY_LEN];
697 	int ret = 0;
698 
699 	nca->payload = NCSI_OEM_INTEL_CMD_KEEP_PHY_LEN;
700 
701 	memset(data, 0, NCSI_OEM_INTEL_CMD_KEEP_PHY_LEN);
702 	*(unsigned int *)data = ntohl((__force __be32)NCSI_OEM_MFR_INTEL_ID);
703 
704 	data[4] = NCSI_OEM_INTEL_CMD_KEEP_PHY;
705 
706 	/* PHY Link up attribute */
707 	data[6] = 0x1;
708 
709 	nca->data = data;
710 
711 	ret = ncsi_xmit_cmd(nca);
712 	if (ret)
713 		netdev_err(nca->ndp->ndev.dev,
714 			   "NCSI: Failed to transmit cmd 0x%x during configure\n",
715 			   nca->type);
716 	return ret;
717 }
718 
719 #endif
720 
721 #if IS_ENABLED(CONFIG_NCSI_OEM_CMD_GET_MAC)
722 
723 /* NCSI OEM Command APIs */
724 static int ncsi_oem_gma_handler_bcm(struct ncsi_cmd_arg *nca)
725 {
726 	unsigned char data[NCSI_OEM_BCM_CMD_GMA_LEN];
727 	int ret = 0;
728 
729 	nca->payload = NCSI_OEM_BCM_CMD_GMA_LEN;
730 
731 	memset(data, 0, NCSI_OEM_BCM_CMD_GMA_LEN);
732 	*(unsigned int *)data = ntohl((__force __be32)NCSI_OEM_MFR_BCM_ID);
733 	data[5] = NCSI_OEM_BCM_CMD_GMA;
734 
735 	nca->data = data;
736 
737 	ret = ncsi_xmit_cmd(nca);
738 	if (ret)
739 		netdev_err(nca->ndp->ndev.dev,
740 			   "NCSI: Failed to transmit cmd 0x%x during configure\n",
741 			   nca->type);
742 	return ret;
743 }
744 
745 static int ncsi_oem_gma_handler_mlx(struct ncsi_cmd_arg *nca)
746 {
747 	union {
748 		u8 data_u8[NCSI_OEM_MLX_CMD_GMA_LEN];
749 		u32 data_u32[NCSI_OEM_MLX_CMD_GMA_LEN / sizeof(u32)];
750 	} u;
751 	int ret = 0;
752 
753 	nca->payload = NCSI_OEM_MLX_CMD_GMA_LEN;
754 
755 	memset(&u, 0, sizeof(u));
756 	u.data_u32[0] = ntohl((__force __be32)NCSI_OEM_MFR_MLX_ID);
757 	u.data_u8[5] = NCSI_OEM_MLX_CMD_GMA;
758 	u.data_u8[6] = NCSI_OEM_MLX_CMD_GMA_PARAM;
759 
760 	nca->data = u.data_u8;
761 
762 	ret = ncsi_xmit_cmd(nca);
763 	if (ret)
764 		netdev_err(nca->ndp->ndev.dev,
765 			   "NCSI: Failed to transmit cmd 0x%x during configure\n",
766 			   nca->type);
767 	return ret;
768 }
769 
770 static int ncsi_oem_smaf_mlx(struct ncsi_cmd_arg *nca)
771 {
772 	union {
773 		u8 data_u8[NCSI_OEM_MLX_CMD_SMAF_LEN];
774 		u32 data_u32[NCSI_OEM_MLX_CMD_SMAF_LEN / sizeof(u32)];
775 	} u;
776 	int ret = 0;
777 
778 	memset(&u, 0, sizeof(u));
779 	u.data_u32[0] = ntohl((__force __be32)NCSI_OEM_MFR_MLX_ID);
780 	u.data_u8[5] = NCSI_OEM_MLX_CMD_SMAF;
781 	u.data_u8[6] = NCSI_OEM_MLX_CMD_SMAF_PARAM;
782 	memcpy(&u.data_u8[MLX_SMAF_MAC_ADDR_OFFSET],
783 	       nca->ndp->ndev.dev->dev_addr,	ETH_ALEN);
784 	u.data_u8[MLX_SMAF_MED_SUPPORT_OFFSET] =
785 		(MLX_MC_RBT_AVL | MLX_MC_RBT_SUPPORT);
786 
787 	nca->payload = NCSI_OEM_MLX_CMD_SMAF_LEN;
788 	nca->data = u.data_u8;
789 
790 	ret = ncsi_xmit_cmd(nca);
791 	if (ret)
792 		netdev_err(nca->ndp->ndev.dev,
793 			   "NCSI: Failed to transmit cmd 0x%x during probe\n",
794 			   nca->type);
795 	return ret;
796 }
797 
798 static int ncsi_oem_gma_handler_intel(struct ncsi_cmd_arg *nca)
799 {
800 	unsigned char data[NCSI_OEM_INTEL_CMD_GMA_LEN];
801 	int ret = 0;
802 
803 	nca->payload = NCSI_OEM_INTEL_CMD_GMA_LEN;
804 
805 	memset(data, 0, NCSI_OEM_INTEL_CMD_GMA_LEN);
806 	*(unsigned int *)data = ntohl((__force __be32)NCSI_OEM_MFR_INTEL_ID);
807 	data[4] = NCSI_OEM_INTEL_CMD_GMA;
808 
809 	nca->data = data;
810 
811 	ret = ncsi_xmit_cmd(nca);
812 	if (ret)
813 		netdev_err(nca->ndp->ndev.dev,
814 			   "NCSI: Failed to transmit cmd 0x%x during configure\n",
815 			   nca->type);
816 
817 	return ret;
818 }
819 
820 /* OEM Command handlers initialization */
821 static struct ncsi_oem_gma_handler {
822 	unsigned int	mfr_id;
823 	int		(*handler)(struct ncsi_cmd_arg *nca);
824 } ncsi_oem_gma_handlers[] = {
825 	{ NCSI_OEM_MFR_BCM_ID, ncsi_oem_gma_handler_bcm },
826 	{ NCSI_OEM_MFR_MLX_ID, ncsi_oem_gma_handler_mlx },
827 	{ NCSI_OEM_MFR_INTEL_ID, ncsi_oem_gma_handler_intel }
828 };
829 
830 static int ncsi_gma_handler(struct ncsi_cmd_arg *nca, unsigned int mf_id)
831 {
832 	struct ncsi_oem_gma_handler *nch = NULL;
833 	int i;
834 
835 	/* This function should only be called once, return if flag set */
836 	if (nca->ndp->gma_flag == 1)
837 		return -1;
838 
839 	/* Find gma handler for given manufacturer id */
840 	for (i = 0; i < ARRAY_SIZE(ncsi_oem_gma_handlers); i++) {
841 		if (ncsi_oem_gma_handlers[i].mfr_id == mf_id) {
842 			if (ncsi_oem_gma_handlers[i].handler)
843 				nch = &ncsi_oem_gma_handlers[i];
844 			break;
845 			}
846 	}
847 
848 	if (!nch) {
849 		netdev_err(nca->ndp->ndev.dev,
850 			   "NCSI: No GMA handler available for MFR-ID (0x%x)\n",
851 			   mf_id);
852 		return -1;
853 	}
854 
855 	/* Get Mac address from NCSI device */
856 	return nch->handler(nca);
857 }
858 
859 #endif /* CONFIG_NCSI_OEM_CMD_GET_MAC */
860 
861 /* Determine if a given channel from the channel_queue should be used for Tx */
862 static bool ncsi_channel_is_tx(struct ncsi_dev_priv *ndp,
863 			       struct ncsi_channel *nc)
864 {
865 	struct ncsi_channel_mode *ncm;
866 	struct ncsi_channel *channel;
867 	struct ncsi_package *np;
868 
869 	/* Check if any other channel has Tx enabled; a channel may have already
870 	 * been configured and removed from the channel queue.
871 	 */
872 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
873 		if (!ndp->multi_package && np != nc->package)
874 			continue;
875 		NCSI_FOR_EACH_CHANNEL(np, channel) {
876 			ncm = &channel->modes[NCSI_MODE_TX_ENABLE];
877 			if (ncm->enable)
878 				return false;
879 		}
880 	}
881 
882 	/* This channel is the preferred channel and has link */
883 	list_for_each_entry_rcu(channel, &ndp->channel_queue, link) {
884 		np = channel->package;
885 		if (np->preferred_channel &&
886 		    ncsi_channel_has_link(np->preferred_channel)) {
887 			return np->preferred_channel == nc;
888 		}
889 	}
890 
891 	/* This channel has link */
892 	if (ncsi_channel_has_link(nc))
893 		return true;
894 
895 	list_for_each_entry_rcu(channel, &ndp->channel_queue, link)
896 		if (ncsi_channel_has_link(channel))
897 			return false;
898 
899 	/* No other channel has link; default to this one */
900 	return true;
901 }
902 
903 /* Change the active Tx channel in a multi-channel setup */
904 int ncsi_update_tx_channel(struct ncsi_dev_priv *ndp,
905 			   struct ncsi_package *package,
906 			   struct ncsi_channel *disable,
907 			   struct ncsi_channel *enable)
908 {
909 	struct ncsi_cmd_arg nca;
910 	struct ncsi_channel *nc;
911 	struct ncsi_package *np;
912 	int ret = 0;
913 
914 	if (!package->multi_channel && !ndp->multi_package)
915 		netdev_warn(ndp->ndev.dev,
916 			    "NCSI: Trying to update Tx channel in single-channel mode\n");
917 	nca.ndp = ndp;
918 	nca.req_flags = 0;
919 
920 	/* Find current channel with Tx enabled */
921 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
922 		if (disable)
923 			break;
924 		if (!ndp->multi_package && np != package)
925 			continue;
926 
927 		NCSI_FOR_EACH_CHANNEL(np, nc)
928 			if (nc->modes[NCSI_MODE_TX_ENABLE].enable) {
929 				disable = nc;
930 				break;
931 			}
932 	}
933 
934 	/* Find a suitable channel for Tx */
935 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
936 		if (enable)
937 			break;
938 		if (!ndp->multi_package && np != package)
939 			continue;
940 		if (!(ndp->package_whitelist & (0x1 << np->id)))
941 			continue;
942 
943 		if (np->preferred_channel &&
944 		    ncsi_channel_has_link(np->preferred_channel)) {
945 			enable = np->preferred_channel;
946 			break;
947 		}
948 
949 		NCSI_FOR_EACH_CHANNEL(np, nc) {
950 			if (!(np->channel_whitelist & 0x1 << nc->id))
951 				continue;
952 			if (nc->state != NCSI_CHANNEL_ACTIVE)
953 				continue;
954 			if (ncsi_channel_has_link(nc)) {
955 				enable = nc;
956 				break;
957 			}
958 		}
959 	}
960 
961 	if (disable == enable)
962 		return -1;
963 
964 	if (!enable)
965 		return -1;
966 
967 	if (disable) {
968 		nca.channel = disable->id;
969 		nca.package = disable->package->id;
970 		nca.type = NCSI_PKT_CMD_DCNT;
971 		ret = ncsi_xmit_cmd(&nca);
972 		if (ret)
973 			netdev_err(ndp->ndev.dev,
974 				   "Error %d sending DCNT\n",
975 				   ret);
976 	}
977 
978 	netdev_info(ndp->ndev.dev, "NCSI: channel %u enables Tx\n", enable->id);
979 
980 	nca.channel = enable->id;
981 	nca.package = enable->package->id;
982 	nca.type = NCSI_PKT_CMD_ECNT;
983 	ret = ncsi_xmit_cmd(&nca);
984 	if (ret)
985 		netdev_err(ndp->ndev.dev,
986 			   "Error %d sending ECNT\n",
987 			   ret);
988 
989 	return ret;
990 }
991 
992 static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
993 {
994 	struct ncsi_package *np = ndp->active_package;
995 	struct ncsi_channel *nc = ndp->active_channel;
996 	struct ncsi_channel *hot_nc = NULL;
997 	struct ncsi_dev *nd = &ndp->ndev;
998 	struct net_device *dev = nd->dev;
999 	struct ncsi_cmd_arg nca;
1000 	unsigned char index;
1001 	unsigned long flags;
1002 	int ret;
1003 
1004 	nca.ndp = ndp;
1005 	nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
1006 	switch (nd->state) {
1007 	case ncsi_dev_state_config:
1008 	case ncsi_dev_state_config_sp:
1009 		ndp->pending_req_num = 1;
1010 
1011 		/* Select the specific package */
1012 		nca.type = NCSI_PKT_CMD_SP;
1013 		if (ndp->flags & NCSI_DEV_HWA)
1014 			nca.bytes[0] = 0;
1015 		else
1016 			nca.bytes[0] = 1;
1017 		nca.package = np->id;
1018 		nca.channel = NCSI_RESERVED_CHANNEL;
1019 		ret = ncsi_xmit_cmd(&nca);
1020 		if (ret) {
1021 			netdev_err(ndp->ndev.dev,
1022 				   "NCSI: Failed to transmit CMD_SP\n");
1023 			goto error;
1024 		}
1025 
1026 		nd->state = ncsi_dev_state_config_cis;
1027 		break;
1028 	case ncsi_dev_state_config_cis:
1029 		ndp->pending_req_num = 1;
1030 
1031 		/* Clear initial state */
1032 		nca.type = NCSI_PKT_CMD_CIS;
1033 		nca.package = np->id;
1034 		nca.channel = nc->id;
1035 		ret = ncsi_xmit_cmd(&nca);
1036 		if (ret) {
1037 			netdev_err(ndp->ndev.dev,
1038 				   "NCSI: Failed to transmit CMD_CIS\n");
1039 			goto error;
1040 		}
1041 
1042 		nd->state = ncsi_dev_state_config_oem_gma;
1043 		break;
1044 	case ncsi_dev_state_config_oem_gma:
1045 		nd->state = ncsi_dev_state_config_clear_vids;
1046 		ret = -1;
1047 
1048 #if IS_ENABLED(CONFIG_NCSI_OEM_CMD_GET_MAC)
1049 		nca.type = NCSI_PKT_CMD_OEM;
1050 		nca.package = np->id;
1051 		nca.channel = nc->id;
1052 		ndp->pending_req_num = 1;
1053 		ret = ncsi_gma_handler(&nca, nc->version.mf_id);
1054 #endif /* CONFIG_NCSI_OEM_CMD_GET_MAC */
1055 
1056 		if (ret < 0)
1057 			schedule_work(&ndp->work);
1058 
1059 		break;
1060 	case ncsi_dev_state_config_clear_vids:
1061 	case ncsi_dev_state_config_svf:
1062 	case ncsi_dev_state_config_ev:
1063 	case ncsi_dev_state_config_sma:
1064 	case ncsi_dev_state_config_ebf:
1065 	case ncsi_dev_state_config_dgmf:
1066 	case ncsi_dev_state_config_ecnt:
1067 	case ncsi_dev_state_config_ec:
1068 	case ncsi_dev_state_config_ae:
1069 	case ncsi_dev_state_config_gls:
1070 		ndp->pending_req_num = 1;
1071 
1072 		nca.package = np->id;
1073 		nca.channel = nc->id;
1074 
1075 		/* Clear any active filters on the channel before setting */
1076 		if (nd->state == ncsi_dev_state_config_clear_vids) {
1077 			ret = clear_one_vid(ndp, nc, &nca);
1078 			if (ret) {
1079 				nd->state = ncsi_dev_state_config_svf;
1080 				schedule_work(&ndp->work);
1081 				break;
1082 			}
1083 			/* Repeat */
1084 			nd->state = ncsi_dev_state_config_clear_vids;
1085 		/* Add known VLAN tags to the filter */
1086 		} else if (nd->state == ncsi_dev_state_config_svf) {
1087 			ret = set_one_vid(ndp, nc, &nca);
1088 			if (ret) {
1089 				nd->state = ncsi_dev_state_config_ev;
1090 				schedule_work(&ndp->work);
1091 				break;
1092 			}
1093 			/* Repeat */
1094 			nd->state = ncsi_dev_state_config_svf;
1095 		/* Enable/Disable the VLAN filter */
1096 		} else if (nd->state == ncsi_dev_state_config_ev) {
1097 			if (list_empty(&ndp->vlan_vids)) {
1098 				nca.type = NCSI_PKT_CMD_DV;
1099 			} else {
1100 				nca.type = NCSI_PKT_CMD_EV;
1101 				nca.bytes[3] = NCSI_CAP_VLAN_NO;
1102 			}
1103 			nd->state = ncsi_dev_state_config_sma;
1104 		} else if (nd->state == ncsi_dev_state_config_sma) {
1105 		/* Use first entry in unicast filter table. Note that
1106 		 * the MAC filter table starts from entry 1 instead of
1107 		 * 0.
1108 		 */
1109 			nca.type = NCSI_PKT_CMD_SMA;
1110 			for (index = 0; index < 6; index++)
1111 				nca.bytes[index] = dev->dev_addr[index];
1112 			nca.bytes[6] = 0x1;
1113 			nca.bytes[7] = 0x1;
1114 			nd->state = ncsi_dev_state_config_ebf;
1115 		} else if (nd->state == ncsi_dev_state_config_ebf) {
1116 			nca.type = NCSI_PKT_CMD_EBF;
1117 			nca.dwords[0] = nc->caps[NCSI_CAP_BC].cap;
1118 			/* if multicast global filtering is supported then
1119 			 * disable it so that all multicast packet will be
1120 			 * forwarded to management controller
1121 			 */
1122 			if (nc->caps[NCSI_CAP_GENERIC].cap &
1123 			    NCSI_CAP_GENERIC_MC)
1124 				nd->state = ncsi_dev_state_config_dgmf;
1125 			else if (ncsi_channel_is_tx(ndp, nc))
1126 				nd->state = ncsi_dev_state_config_ecnt;
1127 			else
1128 				nd->state = ncsi_dev_state_config_ec;
1129 		} else if (nd->state == ncsi_dev_state_config_dgmf) {
1130 			nca.type = NCSI_PKT_CMD_DGMF;
1131 			if (ncsi_channel_is_tx(ndp, nc))
1132 				nd->state = ncsi_dev_state_config_ecnt;
1133 			else
1134 				nd->state = ncsi_dev_state_config_ec;
1135 		} else if (nd->state == ncsi_dev_state_config_ecnt) {
1136 			if (np->preferred_channel &&
1137 			    nc != np->preferred_channel)
1138 				netdev_info(ndp->ndev.dev,
1139 					    "NCSI: Tx failed over to channel %u\n",
1140 					    nc->id);
1141 			nca.type = NCSI_PKT_CMD_ECNT;
1142 			nd->state = ncsi_dev_state_config_ec;
1143 		} else if (nd->state == ncsi_dev_state_config_ec) {
1144 			/* Enable AEN if it's supported */
1145 			nca.type = NCSI_PKT_CMD_EC;
1146 			nd->state = ncsi_dev_state_config_ae;
1147 			if (!(nc->caps[NCSI_CAP_AEN].cap & NCSI_CAP_AEN_MASK))
1148 				nd->state = ncsi_dev_state_config_gls;
1149 		} else if (nd->state == ncsi_dev_state_config_ae) {
1150 			nca.type = NCSI_PKT_CMD_AE;
1151 			nca.bytes[0] = 0;
1152 			nca.dwords[1] = nc->caps[NCSI_CAP_AEN].cap;
1153 			nd->state = ncsi_dev_state_config_gls;
1154 		} else if (nd->state == ncsi_dev_state_config_gls) {
1155 			nca.type = NCSI_PKT_CMD_GLS;
1156 			nd->state = ncsi_dev_state_config_done;
1157 		}
1158 
1159 		ret = ncsi_xmit_cmd(&nca);
1160 		if (ret) {
1161 			netdev_err(ndp->ndev.dev,
1162 				   "NCSI: Failed to transmit CMD %x\n",
1163 				   nca.type);
1164 			goto error;
1165 		}
1166 		break;
1167 	case ncsi_dev_state_config_done:
1168 		netdev_dbg(ndp->ndev.dev, "NCSI: channel %u config done\n",
1169 			   nc->id);
1170 		spin_lock_irqsave(&nc->lock, flags);
1171 		nc->state = NCSI_CHANNEL_ACTIVE;
1172 
1173 		if (ndp->flags & NCSI_DEV_RESET) {
1174 			/* A reset event happened during config, start it now */
1175 			nc->reconfigure_needed = false;
1176 			spin_unlock_irqrestore(&nc->lock, flags);
1177 			ncsi_reset_dev(nd);
1178 			break;
1179 		}
1180 
1181 		if (nc->reconfigure_needed) {
1182 			/* This channel's configuration has been updated
1183 			 * part-way during the config state - start the
1184 			 * channel configuration over
1185 			 */
1186 			nc->reconfigure_needed = false;
1187 			nc->state = NCSI_CHANNEL_INACTIVE;
1188 			spin_unlock_irqrestore(&nc->lock, flags);
1189 
1190 			spin_lock_irqsave(&ndp->lock, flags);
1191 			list_add_tail_rcu(&nc->link, &ndp->channel_queue);
1192 			spin_unlock_irqrestore(&ndp->lock, flags);
1193 
1194 			netdev_dbg(dev, "Dirty NCSI channel state reset\n");
1195 			ncsi_process_next_channel(ndp);
1196 			break;
1197 		}
1198 
1199 		if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
1200 			hot_nc = nc;
1201 		} else {
1202 			hot_nc = NULL;
1203 			netdev_dbg(ndp->ndev.dev,
1204 				   "NCSI: channel %u link down after config\n",
1205 				   nc->id);
1206 		}
1207 		spin_unlock_irqrestore(&nc->lock, flags);
1208 
1209 		/* Update the hot channel */
1210 		spin_lock_irqsave(&ndp->lock, flags);
1211 		ndp->hot_channel = hot_nc;
1212 		spin_unlock_irqrestore(&ndp->lock, flags);
1213 
1214 		ncsi_start_channel_monitor(nc);
1215 		ncsi_process_next_channel(ndp);
1216 		break;
1217 	default:
1218 		netdev_alert(dev, "Wrong NCSI state 0x%x in config\n",
1219 			     nd->state);
1220 	}
1221 
1222 	return;
1223 
1224 error:
1225 	ncsi_report_link(ndp, true);
1226 }
1227 
1228 static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
1229 {
1230 	struct ncsi_channel *nc, *found, *hot_nc;
1231 	struct ncsi_channel_mode *ncm;
1232 	unsigned long flags, cflags;
1233 	struct ncsi_package *np;
1234 	bool with_link;
1235 
1236 	spin_lock_irqsave(&ndp->lock, flags);
1237 	hot_nc = ndp->hot_channel;
1238 	spin_unlock_irqrestore(&ndp->lock, flags);
1239 
1240 	/* By default the search is done once an inactive channel with up
1241 	 * link is found, unless a preferred channel is set.
1242 	 * If multi_package or multi_channel are configured all channels in the
1243 	 * whitelist are added to the channel queue.
1244 	 */
1245 	found = NULL;
1246 	with_link = false;
1247 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
1248 		if (!(ndp->package_whitelist & (0x1 << np->id)))
1249 			continue;
1250 		NCSI_FOR_EACH_CHANNEL(np, nc) {
1251 			if (!(np->channel_whitelist & (0x1 << nc->id)))
1252 				continue;
1253 
1254 			spin_lock_irqsave(&nc->lock, cflags);
1255 
1256 			if (!list_empty(&nc->link) ||
1257 			    nc->state != NCSI_CHANNEL_INACTIVE) {
1258 				spin_unlock_irqrestore(&nc->lock, cflags);
1259 				continue;
1260 			}
1261 
1262 			if (!found)
1263 				found = nc;
1264 
1265 			if (nc == hot_nc)
1266 				found = nc;
1267 
1268 			ncm = &nc->modes[NCSI_MODE_LINK];
1269 			if (ncm->data[2] & 0x1) {
1270 				found = nc;
1271 				with_link = true;
1272 			}
1273 
1274 			/* If multi_channel is enabled configure all valid
1275 			 * channels whether or not they currently have link
1276 			 * so they will have AENs enabled.
1277 			 */
1278 			if (with_link || np->multi_channel) {
1279 				spin_lock_irqsave(&ndp->lock, flags);
1280 				list_add_tail_rcu(&nc->link,
1281 						  &ndp->channel_queue);
1282 				spin_unlock_irqrestore(&ndp->lock, flags);
1283 
1284 				netdev_dbg(ndp->ndev.dev,
1285 					   "NCSI: Channel %u added to queue (link %s)\n",
1286 					   nc->id,
1287 					   ncm->data[2] & 0x1 ? "up" : "down");
1288 			}
1289 
1290 			spin_unlock_irqrestore(&nc->lock, cflags);
1291 
1292 			if (with_link && !np->multi_channel)
1293 				break;
1294 		}
1295 		if (with_link && !ndp->multi_package)
1296 			break;
1297 	}
1298 
1299 	if (list_empty(&ndp->channel_queue) && found) {
1300 		netdev_info(ndp->ndev.dev,
1301 			    "NCSI: No channel with link found, configuring channel %u\n",
1302 			    found->id);
1303 		spin_lock_irqsave(&ndp->lock, flags);
1304 		list_add_tail_rcu(&found->link, &ndp->channel_queue);
1305 		spin_unlock_irqrestore(&ndp->lock, flags);
1306 	} else if (!found) {
1307 		netdev_warn(ndp->ndev.dev,
1308 			    "NCSI: No channel found to configure!\n");
1309 		ncsi_report_link(ndp, true);
1310 		return -ENODEV;
1311 	}
1312 
1313 	return ncsi_process_next_channel(ndp);
1314 }
1315 
1316 static bool ncsi_check_hwa(struct ncsi_dev_priv *ndp)
1317 {
1318 	struct ncsi_package *np;
1319 	struct ncsi_channel *nc;
1320 	unsigned int cap;
1321 	bool has_channel = false;
1322 
1323 	/* The hardware arbitration is disabled if any one channel
1324 	 * doesn't support explicitly.
1325 	 */
1326 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
1327 		NCSI_FOR_EACH_CHANNEL(np, nc) {
1328 			has_channel = true;
1329 
1330 			cap = nc->caps[NCSI_CAP_GENERIC].cap;
1331 			if (!(cap & NCSI_CAP_GENERIC_HWA) ||
1332 			    (cap & NCSI_CAP_GENERIC_HWA_MASK) !=
1333 			    NCSI_CAP_GENERIC_HWA_SUPPORT) {
1334 				ndp->flags &= ~NCSI_DEV_HWA;
1335 				return false;
1336 			}
1337 		}
1338 	}
1339 
1340 	if (has_channel) {
1341 		ndp->flags |= NCSI_DEV_HWA;
1342 		return true;
1343 	}
1344 
1345 	ndp->flags &= ~NCSI_DEV_HWA;
1346 	return false;
1347 }
1348 
1349 static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
1350 {
1351 	struct ncsi_dev *nd = &ndp->ndev;
1352 	struct ncsi_package *np;
1353 	struct ncsi_channel *nc;
1354 	struct ncsi_cmd_arg nca;
1355 	unsigned char index;
1356 	int ret;
1357 
1358 	nca.ndp = ndp;
1359 	nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
1360 	switch (nd->state) {
1361 	case ncsi_dev_state_probe:
1362 		nd->state = ncsi_dev_state_probe_deselect;
1363 		fallthrough;
1364 	case ncsi_dev_state_probe_deselect:
1365 		ndp->pending_req_num = 8;
1366 
1367 		/* Deselect all possible packages */
1368 		nca.type = NCSI_PKT_CMD_DP;
1369 		nca.channel = NCSI_RESERVED_CHANNEL;
1370 		for (index = 0; index < 8; index++) {
1371 			nca.package = index;
1372 			ret = ncsi_xmit_cmd(&nca);
1373 			if (ret)
1374 				goto error;
1375 		}
1376 
1377 		nd->state = ncsi_dev_state_probe_package;
1378 		break;
1379 	case ncsi_dev_state_probe_package:
1380 		ndp->pending_req_num = 1;
1381 
1382 		nca.type = NCSI_PKT_CMD_SP;
1383 		nca.bytes[0] = 1;
1384 		nca.package = ndp->package_probe_id;
1385 		nca.channel = NCSI_RESERVED_CHANNEL;
1386 		ret = ncsi_xmit_cmd(&nca);
1387 		if (ret)
1388 			goto error;
1389 		nd->state = ncsi_dev_state_probe_channel;
1390 		break;
1391 	case ncsi_dev_state_probe_channel:
1392 		ndp->active_package = ncsi_find_package(ndp,
1393 							ndp->package_probe_id);
1394 		if (!ndp->active_package) {
1395 			/* No response */
1396 			nd->state = ncsi_dev_state_probe_dp;
1397 			schedule_work(&ndp->work);
1398 			break;
1399 		}
1400 		nd->state = ncsi_dev_state_probe_cis;
1401 		if (IS_ENABLED(CONFIG_NCSI_OEM_CMD_GET_MAC) &&
1402 		    ndp->mlx_multi_host)
1403 			nd->state = ncsi_dev_state_probe_mlx_gma;
1404 
1405 		schedule_work(&ndp->work);
1406 		break;
1407 #if IS_ENABLED(CONFIG_NCSI_OEM_CMD_GET_MAC)
1408 	case ncsi_dev_state_probe_mlx_gma:
1409 		ndp->pending_req_num = 1;
1410 
1411 		nca.type = NCSI_PKT_CMD_OEM;
1412 		nca.package = ndp->active_package->id;
1413 		nca.channel = 0;
1414 		ret = ncsi_oem_gma_handler_mlx(&nca);
1415 		if (ret)
1416 			goto error;
1417 
1418 		nd->state = ncsi_dev_state_probe_mlx_smaf;
1419 		break;
1420 	case ncsi_dev_state_probe_mlx_smaf:
1421 		ndp->pending_req_num = 1;
1422 
1423 		nca.type = NCSI_PKT_CMD_OEM;
1424 		nca.package = ndp->active_package->id;
1425 		nca.channel = 0;
1426 		ret = ncsi_oem_smaf_mlx(&nca);
1427 		if (ret)
1428 			goto error;
1429 
1430 		nd->state = ncsi_dev_state_probe_cis;
1431 		break;
1432 #endif /* CONFIG_NCSI_OEM_CMD_GET_MAC */
1433 	case ncsi_dev_state_probe_cis:
1434 		ndp->pending_req_num = NCSI_RESERVED_CHANNEL;
1435 
1436 		/* Clear initial state */
1437 		nca.type = NCSI_PKT_CMD_CIS;
1438 		nca.package = ndp->active_package->id;
1439 		for (index = 0; index < NCSI_RESERVED_CHANNEL; index++) {
1440 			nca.channel = index;
1441 			ret = ncsi_xmit_cmd(&nca);
1442 			if (ret)
1443 				goto error;
1444 		}
1445 
1446 		nd->state = ncsi_dev_state_probe_gvi;
1447 		if (IS_ENABLED(CONFIG_NCSI_OEM_CMD_KEEP_PHY))
1448 			nd->state = ncsi_dev_state_probe_keep_phy;
1449 		break;
1450 #if IS_ENABLED(CONFIG_NCSI_OEM_CMD_KEEP_PHY)
1451 	case ncsi_dev_state_probe_keep_phy:
1452 		ndp->pending_req_num = 1;
1453 
1454 		nca.type = NCSI_PKT_CMD_OEM;
1455 		nca.package = ndp->active_package->id;
1456 		nca.channel = 0;
1457 		ret = ncsi_oem_keep_phy_intel(&nca);
1458 		if (ret)
1459 			goto error;
1460 
1461 		nd->state = ncsi_dev_state_probe_gvi;
1462 		break;
1463 #endif /* CONFIG_NCSI_OEM_CMD_KEEP_PHY */
1464 	case ncsi_dev_state_probe_gvi:
1465 	case ncsi_dev_state_probe_gc:
1466 	case ncsi_dev_state_probe_gls:
1467 		np = ndp->active_package;
1468 		ndp->pending_req_num = np->channel_num;
1469 
1470 		/* Retrieve version, capability or link status */
1471 		if (nd->state == ncsi_dev_state_probe_gvi)
1472 			nca.type = NCSI_PKT_CMD_GVI;
1473 		else if (nd->state == ncsi_dev_state_probe_gc)
1474 			nca.type = NCSI_PKT_CMD_GC;
1475 		else
1476 			nca.type = NCSI_PKT_CMD_GLS;
1477 
1478 		nca.package = np->id;
1479 		NCSI_FOR_EACH_CHANNEL(np, nc) {
1480 			nca.channel = nc->id;
1481 			ret = ncsi_xmit_cmd(&nca);
1482 			if (ret)
1483 				goto error;
1484 		}
1485 
1486 		if (nd->state == ncsi_dev_state_probe_gvi)
1487 			nd->state = ncsi_dev_state_probe_gc;
1488 		else if (nd->state == ncsi_dev_state_probe_gc)
1489 			nd->state = ncsi_dev_state_probe_gls;
1490 		else
1491 			nd->state = ncsi_dev_state_probe_dp;
1492 		break;
1493 	case ncsi_dev_state_probe_dp:
1494 		ndp->pending_req_num = 1;
1495 
1496 		/* Deselect the current package */
1497 		nca.type = NCSI_PKT_CMD_DP;
1498 		nca.package = ndp->package_probe_id;
1499 		nca.channel = NCSI_RESERVED_CHANNEL;
1500 		ret = ncsi_xmit_cmd(&nca);
1501 		if (ret)
1502 			goto error;
1503 
1504 		/* Probe next package */
1505 		ndp->package_probe_id++;
1506 		if (ndp->package_probe_id >= 8) {
1507 			/* Probe finished */
1508 			ndp->flags |= NCSI_DEV_PROBED;
1509 			break;
1510 		}
1511 		nd->state = ncsi_dev_state_probe_package;
1512 		ndp->active_package = NULL;
1513 		break;
1514 	default:
1515 		netdev_warn(nd->dev, "Wrong NCSI state 0x%0x in enumeration\n",
1516 			    nd->state);
1517 	}
1518 
1519 	if (ndp->flags & NCSI_DEV_PROBED) {
1520 		/* Check if all packages have HWA support */
1521 		ncsi_check_hwa(ndp);
1522 		ncsi_choose_active_channel(ndp);
1523 	}
1524 
1525 	return;
1526 error:
1527 	netdev_err(ndp->ndev.dev,
1528 		   "NCSI: Failed to transmit cmd 0x%x during probe\n",
1529 		   nca.type);
1530 	ncsi_report_link(ndp, true);
1531 }
1532 
1533 static void ncsi_dev_work(struct work_struct *work)
1534 {
1535 	struct ncsi_dev_priv *ndp = container_of(work,
1536 			struct ncsi_dev_priv, work);
1537 	struct ncsi_dev *nd = &ndp->ndev;
1538 
1539 	switch (nd->state & ncsi_dev_state_major) {
1540 	case ncsi_dev_state_probe:
1541 		ncsi_probe_channel(ndp);
1542 		break;
1543 	case ncsi_dev_state_suspend:
1544 		ncsi_suspend_channel(ndp);
1545 		break;
1546 	case ncsi_dev_state_config:
1547 		ncsi_configure_channel(ndp);
1548 		break;
1549 	default:
1550 		netdev_warn(nd->dev, "Wrong NCSI state 0x%x in workqueue\n",
1551 			    nd->state);
1552 	}
1553 }
1554 
1555 int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
1556 {
1557 	struct ncsi_channel *nc;
1558 	int old_state;
1559 	unsigned long flags;
1560 
1561 	spin_lock_irqsave(&ndp->lock, flags);
1562 	nc = list_first_or_null_rcu(&ndp->channel_queue,
1563 				    struct ncsi_channel, link);
1564 	if (!nc) {
1565 		spin_unlock_irqrestore(&ndp->lock, flags);
1566 		goto out;
1567 	}
1568 
1569 	list_del_init(&nc->link);
1570 	spin_unlock_irqrestore(&ndp->lock, flags);
1571 
1572 	spin_lock_irqsave(&nc->lock, flags);
1573 	old_state = nc->state;
1574 	nc->state = NCSI_CHANNEL_INVISIBLE;
1575 	spin_unlock_irqrestore(&nc->lock, flags);
1576 
1577 	ndp->active_channel = nc;
1578 	ndp->active_package = nc->package;
1579 
1580 	switch (old_state) {
1581 	case NCSI_CHANNEL_INACTIVE:
1582 		ndp->ndev.state = ncsi_dev_state_config;
1583 		netdev_dbg(ndp->ndev.dev, "NCSI: configuring channel %u\n",
1584 	                   nc->id);
1585 		ncsi_configure_channel(ndp);
1586 		break;
1587 	case NCSI_CHANNEL_ACTIVE:
1588 		ndp->ndev.state = ncsi_dev_state_suspend;
1589 		netdev_dbg(ndp->ndev.dev, "NCSI: suspending channel %u\n",
1590 			   nc->id);
1591 		ncsi_suspend_channel(ndp);
1592 		break;
1593 	default:
1594 		netdev_err(ndp->ndev.dev, "Invalid state 0x%x on %d:%d\n",
1595 			   old_state, nc->package->id, nc->id);
1596 		ncsi_report_link(ndp, false);
1597 		return -EINVAL;
1598 	}
1599 
1600 	return 0;
1601 
1602 out:
1603 	ndp->active_channel = NULL;
1604 	ndp->active_package = NULL;
1605 	if (ndp->flags & NCSI_DEV_RESHUFFLE) {
1606 		ndp->flags &= ~NCSI_DEV_RESHUFFLE;
1607 		return ncsi_choose_active_channel(ndp);
1608 	}
1609 
1610 	ncsi_report_link(ndp, false);
1611 	return -ENODEV;
1612 }
1613 
1614 static int ncsi_kick_channels(struct ncsi_dev_priv *ndp)
1615 {
1616 	struct ncsi_dev *nd = &ndp->ndev;
1617 	struct ncsi_channel *nc;
1618 	struct ncsi_package *np;
1619 	unsigned long flags;
1620 	unsigned int n = 0;
1621 
1622 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
1623 		NCSI_FOR_EACH_CHANNEL(np, nc) {
1624 			spin_lock_irqsave(&nc->lock, flags);
1625 
1626 			/* Channels may be busy, mark dirty instead of
1627 			 * kicking if;
1628 			 * a) not ACTIVE (configured)
1629 			 * b) in the channel_queue (to be configured)
1630 			 * c) it's ndev is in the config state
1631 			 */
1632 			if (nc->state != NCSI_CHANNEL_ACTIVE) {
1633 				if ((ndp->ndev.state & 0xff00) ==
1634 						ncsi_dev_state_config ||
1635 						!list_empty(&nc->link)) {
1636 					netdev_dbg(nd->dev,
1637 						   "NCSI: channel %p marked dirty\n",
1638 						   nc);
1639 					nc->reconfigure_needed = true;
1640 				}
1641 				spin_unlock_irqrestore(&nc->lock, flags);
1642 				continue;
1643 			}
1644 
1645 			spin_unlock_irqrestore(&nc->lock, flags);
1646 
1647 			ncsi_stop_channel_monitor(nc);
1648 			spin_lock_irqsave(&nc->lock, flags);
1649 			nc->state = NCSI_CHANNEL_INACTIVE;
1650 			spin_unlock_irqrestore(&nc->lock, flags);
1651 
1652 			spin_lock_irqsave(&ndp->lock, flags);
1653 			list_add_tail_rcu(&nc->link, &ndp->channel_queue);
1654 			spin_unlock_irqrestore(&ndp->lock, flags);
1655 
1656 			netdev_dbg(nd->dev, "NCSI: kicked channel %p\n", nc);
1657 			n++;
1658 		}
1659 	}
1660 
1661 	return n;
1662 }
1663 
1664 int ncsi_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
1665 {
1666 	struct ncsi_dev_priv *ndp;
1667 	unsigned int n_vids = 0;
1668 	struct vlan_vid *vlan;
1669 	struct ncsi_dev *nd;
1670 	bool found = false;
1671 
1672 	if (vid == 0)
1673 		return 0;
1674 
1675 	nd = ncsi_find_dev(dev);
1676 	if (!nd) {
1677 		netdev_warn(dev, "NCSI: No net_device?\n");
1678 		return 0;
1679 	}
1680 
1681 	ndp = TO_NCSI_DEV_PRIV(nd);
1682 
1683 	/* Add the VLAN id to our internal list */
1684 	list_for_each_entry_rcu(vlan, &ndp->vlan_vids, list) {
1685 		n_vids++;
1686 		if (vlan->vid == vid) {
1687 			netdev_dbg(dev, "NCSI: vid %u already registered\n",
1688 				   vid);
1689 			return 0;
1690 		}
1691 	}
1692 	if (n_vids >= NCSI_MAX_VLAN_VIDS) {
1693 		netdev_warn(dev,
1694 			    "tried to add vlan id %u but NCSI max already registered (%u)\n",
1695 			    vid, NCSI_MAX_VLAN_VIDS);
1696 		return -ENOSPC;
1697 	}
1698 
1699 	vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1700 	if (!vlan)
1701 		return -ENOMEM;
1702 
1703 	vlan->proto = proto;
1704 	vlan->vid = vid;
1705 	list_add_rcu(&vlan->list, &ndp->vlan_vids);
1706 
1707 	netdev_dbg(dev, "NCSI: Added new vid %u\n", vid);
1708 
1709 	found = ncsi_kick_channels(ndp) != 0;
1710 
1711 	return found ? ncsi_process_next_channel(ndp) : 0;
1712 }
1713 EXPORT_SYMBOL_GPL(ncsi_vlan_rx_add_vid);
1714 
1715 int ncsi_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
1716 {
1717 	struct vlan_vid *vlan, *tmp;
1718 	struct ncsi_dev_priv *ndp;
1719 	struct ncsi_dev *nd;
1720 	bool found = false;
1721 
1722 	if (vid == 0)
1723 		return 0;
1724 
1725 	nd = ncsi_find_dev(dev);
1726 	if (!nd) {
1727 		netdev_warn(dev, "NCSI: no net_device?\n");
1728 		return 0;
1729 	}
1730 
1731 	ndp = TO_NCSI_DEV_PRIV(nd);
1732 
1733 	/* Remove the VLAN id from our internal list */
1734 	list_for_each_entry_safe(vlan, tmp, &ndp->vlan_vids, list)
1735 		if (vlan->vid == vid) {
1736 			netdev_dbg(dev, "NCSI: vid %u found, removing\n", vid);
1737 			list_del_rcu(&vlan->list);
1738 			found = true;
1739 			kfree(vlan);
1740 		}
1741 
1742 	if (!found) {
1743 		netdev_err(dev, "NCSI: vid %u wasn't registered!\n", vid);
1744 		return -EINVAL;
1745 	}
1746 
1747 	found = ncsi_kick_channels(ndp) != 0;
1748 
1749 	return found ? ncsi_process_next_channel(ndp) : 0;
1750 }
1751 EXPORT_SYMBOL_GPL(ncsi_vlan_rx_kill_vid);
1752 
1753 struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
1754 				   void (*handler)(struct ncsi_dev *ndev))
1755 {
1756 	struct ncsi_dev_priv *ndp;
1757 	struct ncsi_dev *nd;
1758 	struct platform_device *pdev;
1759 	struct device_node *np;
1760 	unsigned long flags;
1761 	int i;
1762 
1763 	/* Check if the device has been registered or not */
1764 	nd = ncsi_find_dev(dev);
1765 	if (nd)
1766 		return nd;
1767 
1768 	/* Create NCSI device */
1769 	ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
1770 	if (!ndp)
1771 		return NULL;
1772 
1773 	nd = &ndp->ndev;
1774 	nd->state = ncsi_dev_state_registered;
1775 	nd->dev = dev;
1776 	nd->handler = handler;
1777 	ndp->pending_req_num = 0;
1778 	INIT_LIST_HEAD(&ndp->channel_queue);
1779 	INIT_LIST_HEAD(&ndp->vlan_vids);
1780 	INIT_WORK(&ndp->work, ncsi_dev_work);
1781 	ndp->package_whitelist = UINT_MAX;
1782 
1783 	/* Initialize private NCSI device */
1784 	spin_lock_init(&ndp->lock);
1785 	INIT_LIST_HEAD(&ndp->packages);
1786 	ndp->request_id = NCSI_REQ_START_IDX;
1787 	for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
1788 		ndp->requests[i].id = i;
1789 		ndp->requests[i].ndp = ndp;
1790 		timer_setup(&ndp->requests[i].timer, ncsi_request_timeout, 0);
1791 	}
1792 
1793 	spin_lock_irqsave(&ncsi_dev_lock, flags);
1794 	list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
1795 	spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1796 
1797 	/* Register NCSI packet Rx handler */
1798 	ndp->ptype.type = cpu_to_be16(ETH_P_NCSI);
1799 	ndp->ptype.func = ncsi_rcv_rsp;
1800 	ndp->ptype.dev = dev;
1801 	dev_add_pack(&ndp->ptype);
1802 
1803 	pdev = to_platform_device(dev->dev.parent);
1804 	if (pdev) {
1805 		np = pdev->dev.of_node;
1806 		if (np && (of_get_property(np, "mellanox,multi-host", NULL) ||
1807 			   of_get_property(np, "mlx,multi-host", NULL)))
1808 			ndp->mlx_multi_host = true;
1809 	}
1810 
1811 	return nd;
1812 }
1813 EXPORT_SYMBOL_GPL(ncsi_register_dev);
1814 
1815 int ncsi_start_dev(struct ncsi_dev *nd)
1816 {
1817 	struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1818 
1819 	if (nd->state != ncsi_dev_state_registered &&
1820 	    nd->state != ncsi_dev_state_functional)
1821 		return -ENOTTY;
1822 
1823 	if (!(ndp->flags & NCSI_DEV_PROBED)) {
1824 		ndp->package_probe_id = 0;
1825 		nd->state = ncsi_dev_state_probe;
1826 		schedule_work(&ndp->work);
1827 		return 0;
1828 	}
1829 
1830 	return ncsi_reset_dev(nd);
1831 }
1832 EXPORT_SYMBOL_GPL(ncsi_start_dev);
1833 
1834 void ncsi_stop_dev(struct ncsi_dev *nd)
1835 {
1836 	struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1837 	struct ncsi_package *np;
1838 	struct ncsi_channel *nc;
1839 	bool chained;
1840 	int old_state;
1841 	unsigned long flags;
1842 
1843 	/* Stop the channel monitor on any active channels. Don't reset the
1844 	 * channel state so we know which were active when ncsi_start_dev()
1845 	 * is next called.
1846 	 */
1847 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
1848 		NCSI_FOR_EACH_CHANNEL(np, nc) {
1849 			ncsi_stop_channel_monitor(nc);
1850 
1851 			spin_lock_irqsave(&nc->lock, flags);
1852 			chained = !list_empty(&nc->link);
1853 			old_state = nc->state;
1854 			spin_unlock_irqrestore(&nc->lock, flags);
1855 
1856 			WARN_ON_ONCE(chained ||
1857 				     old_state == NCSI_CHANNEL_INVISIBLE);
1858 		}
1859 	}
1860 
1861 	netdev_dbg(ndp->ndev.dev, "NCSI: Stopping device\n");
1862 	ncsi_report_link(ndp, true);
1863 }
1864 EXPORT_SYMBOL_GPL(ncsi_stop_dev);
1865 
1866 int ncsi_reset_dev(struct ncsi_dev *nd)
1867 {
1868 	struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1869 	struct ncsi_channel *nc, *active, *tmp;
1870 	struct ncsi_package *np;
1871 	unsigned long flags;
1872 
1873 	spin_lock_irqsave(&ndp->lock, flags);
1874 
1875 	if (!(ndp->flags & NCSI_DEV_RESET)) {
1876 		/* Haven't been called yet, check states */
1877 		switch (nd->state & ncsi_dev_state_major) {
1878 		case ncsi_dev_state_registered:
1879 		case ncsi_dev_state_probe:
1880 			/* Not even probed yet - do nothing */
1881 			spin_unlock_irqrestore(&ndp->lock, flags);
1882 			return 0;
1883 		case ncsi_dev_state_suspend:
1884 		case ncsi_dev_state_config:
1885 			/* Wait for the channel to finish its suspend/config
1886 			 * operation; once it finishes it will check for
1887 			 * NCSI_DEV_RESET and reset the state.
1888 			 */
1889 			ndp->flags |= NCSI_DEV_RESET;
1890 			spin_unlock_irqrestore(&ndp->lock, flags);
1891 			return 0;
1892 		}
1893 	} else {
1894 		switch (nd->state) {
1895 		case ncsi_dev_state_suspend_done:
1896 		case ncsi_dev_state_config_done:
1897 		case ncsi_dev_state_functional:
1898 			/* Ok */
1899 			break;
1900 		default:
1901 			/* Current reset operation happening */
1902 			spin_unlock_irqrestore(&ndp->lock, flags);
1903 			return 0;
1904 		}
1905 	}
1906 
1907 	if (!list_empty(&ndp->channel_queue)) {
1908 		/* Clear any channel queue we may have interrupted */
1909 		list_for_each_entry_safe(nc, tmp, &ndp->channel_queue, link)
1910 			list_del_init(&nc->link);
1911 	}
1912 	spin_unlock_irqrestore(&ndp->lock, flags);
1913 
1914 	active = NULL;
1915 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
1916 		NCSI_FOR_EACH_CHANNEL(np, nc) {
1917 			spin_lock_irqsave(&nc->lock, flags);
1918 
1919 			if (nc->state == NCSI_CHANNEL_ACTIVE) {
1920 				active = nc;
1921 				nc->state = NCSI_CHANNEL_INVISIBLE;
1922 				spin_unlock_irqrestore(&nc->lock, flags);
1923 				ncsi_stop_channel_monitor(nc);
1924 				break;
1925 			}
1926 
1927 			spin_unlock_irqrestore(&nc->lock, flags);
1928 		}
1929 		if (active)
1930 			break;
1931 	}
1932 
1933 	if (!active) {
1934 		/* Done */
1935 		spin_lock_irqsave(&ndp->lock, flags);
1936 		ndp->flags &= ~NCSI_DEV_RESET;
1937 		spin_unlock_irqrestore(&ndp->lock, flags);
1938 		return ncsi_choose_active_channel(ndp);
1939 	}
1940 
1941 	spin_lock_irqsave(&ndp->lock, flags);
1942 	ndp->flags |= NCSI_DEV_RESET;
1943 	ndp->active_channel = active;
1944 	ndp->active_package = active->package;
1945 	spin_unlock_irqrestore(&ndp->lock, flags);
1946 
1947 	nd->state = ncsi_dev_state_suspend;
1948 	schedule_work(&ndp->work);
1949 	return 0;
1950 }
1951 
1952 void ncsi_unregister_dev(struct ncsi_dev *nd)
1953 {
1954 	struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1955 	struct ncsi_package *np, *tmp;
1956 	unsigned long flags;
1957 
1958 	dev_remove_pack(&ndp->ptype);
1959 
1960 	list_for_each_entry_safe(np, tmp, &ndp->packages, node)
1961 		ncsi_remove_package(np);
1962 
1963 	spin_lock_irqsave(&ncsi_dev_lock, flags);
1964 	list_del_rcu(&ndp->node);
1965 	spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1966 
1967 	kfree(ndp);
1968 }
1969 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
1970