2 * Copyright Gavin Shan, IBM Corporation 2016.
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.
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>
18 #include <net/net_namespace.h>
20 #include <net/addrconf.h>
22 #include <net/if_inet6.h>
27 LIST_HEAD(ncsi_dev_list);
28 DEFINE_SPINLOCK(ncsi_dev_lock);
30 static inline int ncsi_filter_size(int table)
32 int sizes[] = { 2, 6, 6, 6 };
34 BUILD_BUG_ON(ARRAY_SIZE(sizes) != NCSI_FILTER_MAX);
35 if (table < NCSI_FILTER_BASE || table >= NCSI_FILTER_MAX)
41 int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data)
43 struct ncsi_channel_filter *ncf;
48 ncf = nc->filters[table];
52 size = ncsi_filter_size(table);
56 spin_lock_irqsave(&nc->lock, flags);
57 bitmap = (void *)&ncf->bitmap;
59 while ((index = find_next_bit(bitmap, ncf->total, index + 1))
61 if (!memcmp(ncf->data + size * index, data, size)) {
62 spin_unlock_irqrestore(&nc->lock, flags);
66 spin_unlock_irqrestore(&nc->lock, flags);
71 int ncsi_add_filter(struct ncsi_channel *nc, int table, void *data)
73 struct ncsi_channel_filter *ncf;
78 size = ncsi_filter_size(table);
82 index = ncsi_find_filter(nc, table, data);
86 ncf = nc->filters[table];
90 spin_lock_irqsave(&nc->lock, flags);
91 bitmap = (void *)&ncf->bitmap;
93 index = find_next_zero_bit(bitmap, ncf->total, 0);
94 if (index >= ncf->total) {
95 spin_unlock_irqrestore(&nc->lock, flags);
98 } while (test_and_set_bit(index, bitmap));
100 memcpy(ncf->data + size * index, data, size);
101 spin_unlock_irqrestore(&nc->lock, flags);
106 int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index)
108 struct ncsi_channel_filter *ncf;
113 size = ncsi_filter_size(table);
117 ncf = nc->filters[table];
118 if (!ncf || index >= ncf->total)
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);
130 static void ncsi_report_link(struct ncsi_dev_priv *ndp, bool force_down)
132 struct ncsi_dev *nd = &ndp->ndev;
133 struct ncsi_package *np;
134 struct ncsi_channel *nc;
137 nd->state = ncsi_dev_state_functional;
144 NCSI_FOR_EACH_PACKAGE(ndp, np) {
145 NCSI_FOR_EACH_CHANNEL(np, nc) {
146 spin_lock_irqsave(&nc->lock, flags);
148 if (!list_empty(&nc->link) ||
149 nc->state != NCSI_CHANNEL_ACTIVE) {
150 spin_unlock_irqrestore(&nc->lock, flags);
154 if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
155 spin_unlock_irqrestore(&nc->lock, flags);
160 spin_unlock_irqrestore(&nc->lock, flags);
168 static void ncsi_channel_monitor(unsigned long data)
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;
179 spin_lock_irqsave(&nc->lock, flags);
181 chained = !list_empty(&nc->link);
182 enabled = nc->monitor.enabled;
183 monitor_state = nc->monitor.state;
184 spin_unlock_irqrestore(&nc->lock, flags);
186 if (!enabled || chained)
188 if (state != NCSI_CHANNEL_INACTIVE &&
189 state != NCSI_CHANNEL_ACTIVE)
192 switch (monitor_state) {
193 case NCSI_CHANNEL_MONITOR_START:
194 case NCSI_CHANNEL_MONITOR_RETRY:
196 nca.package = np->id;
197 nca.channel = nc->id;
198 nca.type = NCSI_PKT_CMD_GLS;
200 ret = ncsi_xmit_cmd(&nca);
202 netdev_err(ndp->ndev.dev, "Error %d sending GLS\n",
208 case NCSI_CHANNEL_MONITOR_WAIT ... NCSI_CHANNEL_MONITOR_WAIT_MAX:
211 if (!(ndp->flags & NCSI_DEV_HWA) &&
212 state == NCSI_CHANNEL_ACTIVE) {
213 ncsi_report_link(ndp, true);
214 ndp->flags |= NCSI_DEV_RESHUFFLE;
217 spin_lock_irqsave(&nc->lock, flags);
218 nc->state = NCSI_CHANNEL_INVISIBLE;
219 spin_unlock_irqrestore(&nc->lock, flags);
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);
229 spin_lock_irqsave(&nc->lock, flags);
231 spin_unlock_irqrestore(&nc->lock, flags);
232 mod_timer(&nc->monitor.timer, jiffies + HZ);
235 void ncsi_start_channel_monitor(struct ncsi_channel *nc)
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);
245 mod_timer(&nc->monitor.timer, jiffies + HZ);
248 void ncsi_stop_channel_monitor(struct ncsi_channel *nc)
252 spin_lock_irqsave(&nc->lock, flags);
253 if (!nc->monitor.enabled) {
254 spin_unlock_irqrestore(&nc->lock, flags);
257 nc->monitor.enabled = false;
258 spin_unlock_irqrestore(&nc->lock, flags);
260 del_timer_sync(&nc->monitor.timer);
263 struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
266 struct ncsi_channel *nc;
268 NCSI_FOR_EACH_CHANNEL(np, nc) {
276 struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
278 struct ncsi_channel *nc, *tmp;
282 nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
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;
299 spin_lock_irqsave(&np->lock, flags);
300 tmp = ncsi_find_channel(np, id);
302 spin_unlock_irqrestore(&np->lock, flags);
307 list_add_tail_rcu(&nc->node, &np->channels);
309 spin_unlock_irqrestore(&np->lock, flags);
314 static void ncsi_remove_channel(struct ncsi_channel *nc)
316 struct ncsi_package *np = nc->package;
317 struct ncsi_channel_filter *ncf;
321 /* Release filters */
322 spin_lock_irqsave(&nc->lock, flags);
323 for (i = 0; i < NCSI_FILTER_MAX; i++) {
324 ncf = nc->filters[i];
328 nc->filters[i] = NULL;
332 nc->state = NCSI_CHANNEL_INACTIVE;
333 spin_unlock_irqrestore(&nc->lock, flags);
334 ncsi_stop_channel_monitor(nc);
336 /* Remove and free channel */
337 spin_lock_irqsave(&np->lock, flags);
338 list_del_rcu(&nc->node);
340 spin_unlock_irqrestore(&np->lock, flags);
345 struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
348 struct ncsi_package *np;
350 NCSI_FOR_EACH_PACKAGE(ndp, np) {
358 struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
361 struct ncsi_package *np, *tmp;
364 np = kzalloc(sizeof(*np), GFP_ATOMIC);
370 spin_lock_init(&np->lock);
371 INIT_LIST_HEAD(&np->channels);
373 spin_lock_irqsave(&ndp->lock, flags);
374 tmp = ncsi_find_package(ndp, id);
376 spin_unlock_irqrestore(&ndp->lock, flags);
381 list_add_tail_rcu(&np->node, &ndp->packages);
383 spin_unlock_irqrestore(&ndp->lock, flags);
388 void ncsi_remove_package(struct ncsi_package *np)
390 struct ncsi_dev_priv *ndp = np->ndp;
391 struct ncsi_channel *nc, *tmp;
394 /* Release all child channels */
395 list_for_each_entry_safe(nc, tmp, &np->channels, node)
396 ncsi_remove_channel(nc);
398 /* Remove and free package */
399 spin_lock_irqsave(&ndp->lock, flags);
400 list_del_rcu(&np->node);
402 spin_unlock_irqrestore(&ndp->lock, flags);
407 void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
409 struct ncsi_package **np,
410 struct ncsi_channel **nc)
412 struct ncsi_package *p;
413 struct ncsi_channel *c;
415 p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
416 c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;
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.
428 struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp,
429 unsigned int req_flags)
431 struct ncsi_request *nr = NULL;
432 int i, limit = ARRAY_SIZE(ndp->requests);
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)
441 nr = &ndp->requests[i];
443 nr->flags = req_flags;
444 ndp->request_id = i + 1;
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)
453 nr = &ndp->requests[i];
455 nr->flags = req_flags;
456 ndp->request_id = i + 1;
461 spin_unlock_irqrestore(&ndp->lock, flags);
465 void ncsi_free_request(struct ncsi_request *nr)
467 struct ncsi_dev_priv *ndp = nr->ndp;
468 struct sk_buff *cmd, *rsp;
474 del_timer_sync(&nr->timer);
477 spin_lock_irqsave(&ndp->lock, flags);
483 driven = !!(nr->flags & NCSI_REQ_FLAG_EVENT_DRIVEN);
484 spin_unlock_irqrestore(&ndp->lock, flags);
486 if (driven && cmd && --ndp->pending_req_num == 0)
487 schedule_work(&ndp->work);
489 /* Release command and response */
494 struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
496 struct ncsi_dev_priv *ndp;
498 NCSI_FOR_EACH_DEV(ndp) {
499 if (ndp->ndev.dev == dev)
506 static void ncsi_request_timeout(unsigned long data)
508 struct ncsi_request *nr = (struct ncsi_request *)data;
509 struct ncsi_dev_priv *ndp = nr->ndp;
512 /* If the request already had associated response,
513 * let the response handler to release it.
515 spin_lock_irqsave(&ndp->lock, flags);
517 if (nr->rsp || !nr->cmd) {
518 spin_unlock_irqrestore(&ndp->lock, flags);
521 spin_unlock_irqrestore(&ndp->lock, flags);
523 /* Release the request */
524 ncsi_free_request(nr);
527 static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
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;
537 nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
539 case ncsi_dev_state_suspend:
540 nd->state = ncsi_dev_state_suspend_select;
542 case ncsi_dev_state_suspend_select:
543 case ncsi_dev_state_suspend_dcnt:
544 case ncsi_dev_state_suspend_dc:
545 case ncsi_dev_state_suspend_deselect:
546 ndp->pending_req_num = 1;
548 np = ndp->active_package;
549 nc = ndp->active_channel;
550 nca.package = np->id;
551 if (nd->state == ncsi_dev_state_suspend_select) {
552 nca.type = NCSI_PKT_CMD_SP;
553 nca.channel = NCSI_RESERVED_CHANNEL;
554 if (ndp->flags & NCSI_DEV_HWA)
558 nd->state = ncsi_dev_state_suspend_dcnt;
559 } else if (nd->state == ncsi_dev_state_suspend_dcnt) {
560 nca.type = NCSI_PKT_CMD_DCNT;
561 nca.channel = nc->id;
562 nd->state = ncsi_dev_state_suspend_dc;
563 } else if (nd->state == ncsi_dev_state_suspend_dc) {
564 nca.type = NCSI_PKT_CMD_DC;
565 nca.channel = nc->id;
567 nd->state = ncsi_dev_state_suspend_deselect;
568 } else if (nd->state == ncsi_dev_state_suspend_deselect) {
569 nca.type = NCSI_PKT_CMD_DP;
570 nca.channel = NCSI_RESERVED_CHANNEL;
571 nd->state = ncsi_dev_state_suspend_done;
574 ret = ncsi_xmit_cmd(&nca);
576 nd->state = ncsi_dev_state_functional;
581 case ncsi_dev_state_suspend_done:
582 spin_lock_irqsave(&nc->lock, flags);
583 nc->state = NCSI_CHANNEL_INACTIVE;
584 spin_unlock_irqrestore(&nc->lock, flags);
585 ncsi_process_next_channel(ndp);
589 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in suspend\n",
594 static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
596 struct ncsi_dev *nd = &ndp->ndev;
597 struct net_device *dev = nd->dev;
598 struct ncsi_package *np = ndp->active_package;
599 struct ncsi_channel *nc = ndp->active_channel;
600 struct ncsi_cmd_arg nca;
606 nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
608 case ncsi_dev_state_config:
609 case ncsi_dev_state_config_sp:
610 ndp->pending_req_num = 1;
612 /* Select the specific package */
613 nca.type = NCSI_PKT_CMD_SP;
614 if (ndp->flags & NCSI_DEV_HWA)
618 nca.package = np->id;
619 nca.channel = NCSI_RESERVED_CHANNEL;
620 ret = ncsi_xmit_cmd(&nca);
624 nd->state = ncsi_dev_state_config_cis;
626 case ncsi_dev_state_config_cis:
627 ndp->pending_req_num = 1;
629 /* Clear initial state */
630 nca.type = NCSI_PKT_CMD_CIS;
631 nca.package = np->id;
632 nca.channel = nc->id;
633 ret = ncsi_xmit_cmd(&nca);
637 nd->state = ncsi_dev_state_config_sma;
639 case ncsi_dev_state_config_sma:
640 case ncsi_dev_state_config_ebf:
641 #if IS_ENABLED(CONFIG_IPV6)
642 case ncsi_dev_state_config_egmf:
644 case ncsi_dev_state_config_ecnt:
645 case ncsi_dev_state_config_ec:
646 case ncsi_dev_state_config_ae:
647 case ncsi_dev_state_config_gls:
648 ndp->pending_req_num = 1;
650 nca.package = np->id;
651 nca.channel = nc->id;
653 /* Use first entry in unicast filter table. Note that
654 * the MAC filter table starts from entry 1 instead of
657 if (nd->state == ncsi_dev_state_config_sma) {
658 nca.type = NCSI_PKT_CMD_SMA;
659 for (index = 0; index < 6; index++)
660 nca.bytes[index] = dev->dev_addr[index];
663 nd->state = ncsi_dev_state_config_ebf;
664 } else if (nd->state == ncsi_dev_state_config_ebf) {
665 nca.type = NCSI_PKT_CMD_EBF;
666 nca.dwords[0] = nc->caps[NCSI_CAP_BC].cap;
667 nd->state = ncsi_dev_state_config_ecnt;
668 #if IS_ENABLED(CONFIG_IPV6)
669 if (ndp->inet6_addr_num > 0 &&
670 (nc->caps[NCSI_CAP_GENERIC].cap &
671 NCSI_CAP_GENERIC_MC))
672 nd->state = ncsi_dev_state_config_egmf;
674 nd->state = ncsi_dev_state_config_ecnt;
675 } else if (nd->state == ncsi_dev_state_config_egmf) {
676 nca.type = NCSI_PKT_CMD_EGMF;
677 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
678 nd->state = ncsi_dev_state_config_ecnt;
679 #endif /* CONFIG_IPV6 */
680 } else if (nd->state == ncsi_dev_state_config_ecnt) {
681 nca.type = NCSI_PKT_CMD_ECNT;
682 nd->state = ncsi_dev_state_config_ec;
683 } else if (nd->state == ncsi_dev_state_config_ec) {
684 /* Enable AEN if it's supported */
685 nca.type = NCSI_PKT_CMD_EC;
686 nd->state = ncsi_dev_state_config_ae;
687 if (!(nc->caps[NCSI_CAP_AEN].cap & NCSI_CAP_AEN_MASK))
688 nd->state = ncsi_dev_state_config_gls;
689 } else if (nd->state == ncsi_dev_state_config_ae) {
690 nca.type = NCSI_PKT_CMD_AE;
692 nca.dwords[1] = nc->caps[NCSI_CAP_AEN].cap;
693 nd->state = ncsi_dev_state_config_gls;
694 } else if (nd->state == ncsi_dev_state_config_gls) {
695 nca.type = NCSI_PKT_CMD_GLS;
696 nd->state = ncsi_dev_state_config_done;
699 ret = ncsi_xmit_cmd(&nca);
703 case ncsi_dev_state_config_done:
704 spin_lock_irqsave(&nc->lock, flags);
705 if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1)
706 nc->state = NCSI_CHANNEL_ACTIVE;
708 nc->state = NCSI_CHANNEL_INACTIVE;
709 spin_unlock_irqrestore(&nc->lock, flags);
711 ncsi_start_channel_monitor(nc);
712 ncsi_process_next_channel(ndp);
715 netdev_warn(dev, "Wrong NCSI state 0x%x in config\n",
722 ncsi_report_link(ndp, true);
725 static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
727 struct ncsi_package *np;
728 struct ncsi_channel *nc, *found;
729 struct ncsi_channel_mode *ncm;
732 /* The search is done once an inactive channel with up
736 NCSI_FOR_EACH_PACKAGE(ndp, np) {
737 NCSI_FOR_EACH_CHANNEL(np, nc) {
738 spin_lock_irqsave(&nc->lock, flags);
740 if (!list_empty(&nc->link) ||
741 nc->state != NCSI_CHANNEL_INACTIVE) {
742 spin_unlock_irqrestore(&nc->lock, flags);
749 ncm = &nc->modes[NCSI_MODE_LINK];
750 if (ncm->data[2] & 0x1) {
751 spin_unlock_irqrestore(&nc->lock, flags);
756 spin_unlock_irqrestore(&nc->lock, flags);
761 ncsi_report_link(ndp, true);
766 spin_lock_irqsave(&ndp->lock, flags);
767 list_add_tail_rcu(&found->link, &ndp->channel_queue);
768 spin_unlock_irqrestore(&ndp->lock, flags);
770 return ncsi_process_next_channel(ndp);
773 static bool ncsi_check_hwa(struct ncsi_dev_priv *ndp)
775 struct ncsi_package *np;
776 struct ncsi_channel *nc;
779 /* The hardware arbitration is disabled if any one channel
780 * doesn't support explicitly.
782 NCSI_FOR_EACH_PACKAGE(ndp, np) {
783 NCSI_FOR_EACH_CHANNEL(np, nc) {
784 cap = nc->caps[NCSI_CAP_GENERIC].cap;
785 if (!(cap & NCSI_CAP_GENERIC_HWA) ||
786 (cap & NCSI_CAP_GENERIC_HWA_MASK) !=
787 NCSI_CAP_GENERIC_HWA_SUPPORT) {
788 ndp->flags &= ~NCSI_DEV_HWA;
794 ndp->flags |= NCSI_DEV_HWA;
798 static int ncsi_enable_hwa(struct ncsi_dev_priv *ndp)
800 struct ncsi_package *np;
801 struct ncsi_channel *nc;
804 /* Move all available channels to processing queue */
805 spin_lock_irqsave(&ndp->lock, flags);
806 NCSI_FOR_EACH_PACKAGE(ndp, np) {
807 NCSI_FOR_EACH_CHANNEL(np, nc) {
808 WARN_ON_ONCE(nc->state != NCSI_CHANNEL_INACTIVE ||
809 !list_empty(&nc->link));
810 ncsi_stop_channel_monitor(nc);
811 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
814 spin_unlock_irqrestore(&ndp->lock, flags);
816 /* We can have no channels in extremely case */
817 if (list_empty(&ndp->channel_queue)) {
818 ncsi_report_link(ndp, false);
822 return ncsi_process_next_channel(ndp);
825 static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
827 struct ncsi_dev *nd = &ndp->ndev;
828 struct ncsi_package *np;
829 struct ncsi_channel *nc;
830 struct ncsi_cmd_arg nca;
835 nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
837 case ncsi_dev_state_probe:
838 nd->state = ncsi_dev_state_probe_deselect;
840 case ncsi_dev_state_probe_deselect:
841 ndp->pending_req_num = 8;
843 /* Deselect all possible packages */
844 nca.type = NCSI_PKT_CMD_DP;
845 nca.channel = NCSI_RESERVED_CHANNEL;
846 for (index = 0; index < 8; index++) {
848 ret = ncsi_xmit_cmd(&nca);
853 nd->state = ncsi_dev_state_probe_package;
855 case ncsi_dev_state_probe_package:
856 ndp->pending_req_num = 16;
858 /* Select all possible packages */
859 nca.type = NCSI_PKT_CMD_SP;
861 nca.channel = NCSI_RESERVED_CHANNEL;
862 for (index = 0; index < 8; index++) {
864 ret = ncsi_xmit_cmd(&nca);
869 /* Disable all possible packages */
870 nca.type = NCSI_PKT_CMD_DP;
871 for (index = 0; index < 8; index++) {
873 ret = ncsi_xmit_cmd(&nca);
878 nd->state = ncsi_dev_state_probe_channel;
880 case ncsi_dev_state_probe_channel:
881 if (!ndp->active_package)
882 ndp->active_package = list_first_or_null_rcu(
883 &ndp->packages, struct ncsi_package, node);
884 else if (list_is_last(&ndp->active_package->node,
886 ndp->active_package = NULL;
888 ndp->active_package = list_next_entry(
889 ndp->active_package, node);
891 /* All available packages and channels are enumerated. The
892 * enumeration happens for once when the NCSI interface is
893 * started. So we need continue to start the interface after
896 * We have to choose an active channel before configuring it.
897 * Note that we possibly don't have active channel in extreme
900 if (!ndp->active_package) {
901 ndp->flags |= NCSI_DEV_PROBED;
902 if (ncsi_check_hwa(ndp))
903 ncsi_enable_hwa(ndp);
905 ncsi_choose_active_channel(ndp);
909 /* Select the active package */
910 ndp->pending_req_num = 1;
911 nca.type = NCSI_PKT_CMD_SP;
913 nca.package = ndp->active_package->id;
914 nca.channel = NCSI_RESERVED_CHANNEL;
915 ret = ncsi_xmit_cmd(&nca);
919 nd->state = ncsi_dev_state_probe_cis;
921 case ncsi_dev_state_probe_cis:
922 ndp->pending_req_num = NCSI_RESERVED_CHANNEL;
924 /* Clear initial state */
925 nca.type = NCSI_PKT_CMD_CIS;
926 nca.package = ndp->active_package->id;
927 for (index = 0; index < NCSI_RESERVED_CHANNEL; index++) {
929 ret = ncsi_xmit_cmd(&nca);
934 nd->state = ncsi_dev_state_probe_gvi;
936 case ncsi_dev_state_probe_gvi:
937 case ncsi_dev_state_probe_gc:
938 case ncsi_dev_state_probe_gls:
939 np = ndp->active_package;
940 ndp->pending_req_num = np->channel_num;
942 /* Retrieve version, capability or link status */
943 if (nd->state == ncsi_dev_state_probe_gvi)
944 nca.type = NCSI_PKT_CMD_GVI;
945 else if (nd->state == ncsi_dev_state_probe_gc)
946 nca.type = NCSI_PKT_CMD_GC;
948 nca.type = NCSI_PKT_CMD_GLS;
950 nca.package = np->id;
951 NCSI_FOR_EACH_CHANNEL(np, nc) {
952 nca.channel = nc->id;
953 ret = ncsi_xmit_cmd(&nca);
958 if (nd->state == ncsi_dev_state_probe_gvi)
959 nd->state = ncsi_dev_state_probe_gc;
960 else if (nd->state == ncsi_dev_state_probe_gc)
961 nd->state = ncsi_dev_state_probe_gls;
963 nd->state = ncsi_dev_state_probe_dp;
965 case ncsi_dev_state_probe_dp:
966 ndp->pending_req_num = 1;
968 /* Deselect the active package */
969 nca.type = NCSI_PKT_CMD_DP;
970 nca.package = ndp->active_package->id;
971 nca.channel = NCSI_RESERVED_CHANNEL;
972 ret = ncsi_xmit_cmd(&nca);
976 /* Scan channels in next package */
977 nd->state = ncsi_dev_state_probe_channel;
980 netdev_warn(nd->dev, "Wrong NCSI state 0x%0x in enumeration\n",
986 ncsi_report_link(ndp, true);
989 static void ncsi_dev_work(struct work_struct *work)
991 struct ncsi_dev_priv *ndp = container_of(work,
992 struct ncsi_dev_priv, work);
993 struct ncsi_dev *nd = &ndp->ndev;
995 switch (nd->state & ncsi_dev_state_major) {
996 case ncsi_dev_state_probe:
997 ncsi_probe_channel(ndp);
999 case ncsi_dev_state_suspend:
1000 ncsi_suspend_channel(ndp);
1002 case ncsi_dev_state_config:
1003 ncsi_configure_channel(ndp);
1006 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in workqueue\n",
1011 int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
1013 struct ncsi_channel *nc;
1015 unsigned long flags;
1017 spin_lock_irqsave(&ndp->lock, flags);
1018 nc = list_first_or_null_rcu(&ndp->channel_queue,
1019 struct ncsi_channel, link);
1021 spin_unlock_irqrestore(&ndp->lock, flags);
1025 list_del_init(&nc->link);
1026 spin_unlock_irqrestore(&ndp->lock, flags);
1028 spin_lock_irqsave(&nc->lock, flags);
1029 old_state = nc->state;
1030 nc->state = NCSI_CHANNEL_INVISIBLE;
1031 spin_unlock_irqrestore(&nc->lock, flags);
1033 ndp->active_channel = nc;
1034 ndp->active_package = nc->package;
1036 switch (old_state) {
1037 case NCSI_CHANNEL_INACTIVE:
1038 ndp->ndev.state = ncsi_dev_state_config;
1039 ncsi_configure_channel(ndp);
1041 case NCSI_CHANNEL_ACTIVE:
1042 ndp->ndev.state = ncsi_dev_state_suspend;
1043 ncsi_suspend_channel(ndp);
1046 netdev_err(ndp->ndev.dev, "Invalid state 0x%x on %d:%d\n",
1047 old_state, nc->package->id, nc->id);
1048 ncsi_report_link(ndp, false);
1055 ndp->active_channel = NULL;
1056 ndp->active_package = NULL;
1057 if (ndp->flags & NCSI_DEV_RESHUFFLE) {
1058 ndp->flags &= ~NCSI_DEV_RESHUFFLE;
1059 return ncsi_choose_active_channel(ndp);
1062 ncsi_report_link(ndp, false);
1066 #if IS_ENABLED(CONFIG_IPV6)
1067 static int ncsi_inet6addr_event(struct notifier_block *this,
1068 unsigned long event, void *data)
1070 struct inet6_ifaddr *ifa = data;
1071 struct net_device *dev = ifa->idev->dev;
1072 struct ncsi_dev *nd = ncsi_find_dev(dev);
1073 struct ncsi_dev_priv *ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
1074 struct ncsi_package *np;
1075 struct ncsi_channel *nc;
1076 struct ncsi_cmd_arg nca;
1080 if (!ndp || (ipv6_addr_type(&ifa->addr) &
1081 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)))
1086 action = (++ndp->inet6_addr_num) == 1;
1087 nca.type = NCSI_PKT_CMD_EGMF;
1090 action = (--ndp->inet6_addr_num == 0);
1091 nca.type = NCSI_PKT_CMD_DGMF;
1097 /* We might not have active channel or packages. The IPv6
1098 * required multicast will be enabled when active channel
1099 * or packages are chosen.
1101 np = ndp->active_package;
1102 nc = ndp->active_channel;
1103 if (!action || !np || !nc)
1106 /* We needn't enable or disable it if the function isn't supported */
1107 if (!(nc->caps[NCSI_CAP_GENERIC].cap & NCSI_CAP_GENERIC_MC))
1112 nca.package = np->id;
1113 nca.channel = nc->id;
1114 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
1115 ret = ncsi_xmit_cmd(&nca);
1117 netdev_warn(dev, "Fail to %s global multicast filter (%d)\n",
1118 (event == NETDEV_UP) ? "enable" : "disable", ret);
1125 static struct notifier_block ncsi_inet6addr_notifier = {
1126 .notifier_call = ncsi_inet6addr_event,
1128 #endif /* CONFIG_IPV6 */
1130 struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
1131 void (*handler)(struct ncsi_dev *ndev))
1133 struct ncsi_dev_priv *ndp;
1134 struct ncsi_dev *nd;
1135 unsigned long flags;
1138 /* Check if the device has been registered or not */
1139 nd = ncsi_find_dev(dev);
1143 /* Create NCSI device */
1144 ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
1149 nd->state = ncsi_dev_state_registered;
1151 nd->handler = handler;
1152 ndp->pending_req_num = 0;
1153 INIT_LIST_HEAD(&ndp->channel_queue);
1154 INIT_WORK(&ndp->work, ncsi_dev_work);
1156 /* Initialize private NCSI device */
1157 spin_lock_init(&ndp->lock);
1158 INIT_LIST_HEAD(&ndp->packages);
1159 ndp->request_id = NCSI_REQ_START_IDX;
1160 for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
1161 ndp->requests[i].id = i;
1162 ndp->requests[i].ndp = ndp;
1163 setup_timer(&ndp->requests[i].timer,
1164 ncsi_request_timeout,
1165 (unsigned long)&ndp->requests[i]);
1168 spin_lock_irqsave(&ncsi_dev_lock, flags);
1169 #if IS_ENABLED(CONFIG_IPV6)
1170 ndp->inet6_addr_num = 0;
1171 if (list_empty(&ncsi_dev_list))
1172 register_inet6addr_notifier(&ncsi_inet6addr_notifier);
1174 list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
1175 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1177 /* Register NCSI packet Rx handler */
1178 ndp->ptype.type = cpu_to_be16(ETH_P_NCSI);
1179 ndp->ptype.func = ncsi_rcv_rsp;
1180 ndp->ptype.dev = dev;
1181 dev_add_pack(&ndp->ptype);
1185 EXPORT_SYMBOL_GPL(ncsi_register_dev);
1187 int ncsi_start_dev(struct ncsi_dev *nd)
1189 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1192 if (nd->state != ncsi_dev_state_registered &&
1193 nd->state != ncsi_dev_state_functional)
1196 if (!(ndp->flags & NCSI_DEV_PROBED)) {
1197 nd->state = ncsi_dev_state_probe;
1198 schedule_work(&ndp->work);
1202 if (ndp->flags & NCSI_DEV_HWA)
1203 ret = ncsi_enable_hwa(ndp);
1205 ret = ncsi_choose_active_channel(ndp);
1209 EXPORT_SYMBOL_GPL(ncsi_start_dev);
1211 void ncsi_stop_dev(struct ncsi_dev *nd)
1213 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1214 struct ncsi_package *np;
1215 struct ncsi_channel *nc;
1218 unsigned long flags;
1220 /* Stop the channel monitor and reset channel's state */
1221 NCSI_FOR_EACH_PACKAGE(ndp, np) {
1222 NCSI_FOR_EACH_CHANNEL(np, nc) {
1223 ncsi_stop_channel_monitor(nc);
1225 spin_lock_irqsave(&nc->lock, flags);
1226 chained = !list_empty(&nc->link);
1227 old_state = nc->state;
1228 nc->state = NCSI_CHANNEL_INACTIVE;
1229 spin_unlock_irqrestore(&nc->lock, flags);
1231 WARN_ON_ONCE(chained ||
1232 old_state == NCSI_CHANNEL_INVISIBLE);
1236 ncsi_report_link(ndp, true);
1238 EXPORT_SYMBOL_GPL(ncsi_stop_dev);
1240 void ncsi_unregister_dev(struct ncsi_dev *nd)
1242 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1243 struct ncsi_package *np, *tmp;
1244 unsigned long flags;
1246 dev_remove_pack(&ndp->ptype);
1248 list_for_each_entry_safe(np, tmp, &ndp->packages, node)
1249 ncsi_remove_package(np);
1251 spin_lock_irqsave(&ncsi_dev_lock, flags);
1252 list_del_rcu(&ndp->node);
1253 #if IS_ENABLED(CONFIG_IPV6)
1254 if (list_empty(&ncsi_dev_list))
1255 unregister_inet6addr_notifier(&ncsi_inet6addr_notifier);
1257 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1261 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);