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 timeout;
179 spin_lock_irqsave(&nc->lock, flags);
181 chained = !list_empty(&nc->link);
182 timeout = nc->timeout;
183 enabled = nc->enabled;
184 spin_unlock_irqrestore(&nc->lock, flags);
186 if (!enabled || chained)
188 if (state != NCSI_CHANNEL_INACTIVE &&
189 state != NCSI_CHANNEL_ACTIVE)
192 if (!(timeout % 2)) {
194 nca.package = np->id;
195 nca.channel = nc->id;
196 nca.type = NCSI_PKT_CMD_GLS;
198 ret = ncsi_xmit_cmd(&nca);
200 netdev_err(ndp->ndev.dev, "Error %d sending GLS\n",
206 if (timeout + 1 >= 3) {
207 if (!(ndp->flags & NCSI_DEV_HWA) &&
208 state == NCSI_CHANNEL_ACTIVE)
209 ncsi_report_link(ndp, true);
211 spin_lock_irqsave(&nc->lock, flags);
212 nc->state = NCSI_CHANNEL_INVISIBLE;
213 spin_unlock_irqrestore(&nc->lock, flags);
215 spin_lock_irqsave(&ndp->lock, flags);
216 nc->state = NCSI_CHANNEL_INACTIVE;
217 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
218 spin_unlock_irqrestore(&ndp->lock, flags);
219 ncsi_process_next_channel(ndp);
223 spin_lock_irqsave(&nc->lock, flags);
224 nc->timeout = timeout + 1;
226 spin_unlock_irqrestore(&nc->lock, flags);
227 mod_timer(&nc->timer, jiffies + HZ * (1 << (nc->timeout / 2)));
230 void ncsi_start_channel_monitor(struct ncsi_channel *nc)
234 spin_lock_irqsave(&nc->lock, flags);
235 WARN_ON_ONCE(nc->enabled);
238 spin_unlock_irqrestore(&nc->lock, flags);
240 mod_timer(&nc->timer, jiffies + HZ * (1 << (nc->timeout / 2)));
243 void ncsi_stop_channel_monitor(struct ncsi_channel *nc)
247 spin_lock_irqsave(&nc->lock, flags);
249 spin_unlock_irqrestore(&nc->lock, flags);
253 spin_unlock_irqrestore(&nc->lock, flags);
255 del_timer_sync(&nc->timer);
258 struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
261 struct ncsi_channel *nc;
263 NCSI_FOR_EACH_CHANNEL(np, nc) {
271 struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
273 struct ncsi_channel *nc, *tmp;
277 nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
283 nc->state = NCSI_CHANNEL_INACTIVE;
285 setup_timer(&nc->timer, ncsi_channel_monitor, (unsigned long)nc);
286 spin_lock_init(&nc->lock);
287 INIT_LIST_HEAD(&nc->link);
288 for (index = 0; index < NCSI_CAP_MAX; index++)
289 nc->caps[index].index = index;
290 for (index = 0; index < NCSI_MODE_MAX; index++)
291 nc->modes[index].index = index;
293 spin_lock_irqsave(&np->lock, flags);
294 tmp = ncsi_find_channel(np, id);
296 spin_unlock_irqrestore(&np->lock, flags);
301 list_add_tail_rcu(&nc->node, &np->channels);
303 spin_unlock_irqrestore(&np->lock, flags);
308 static void ncsi_remove_channel(struct ncsi_channel *nc)
310 struct ncsi_package *np = nc->package;
311 struct ncsi_channel_filter *ncf;
315 /* Release filters */
316 spin_lock_irqsave(&nc->lock, flags);
317 for (i = 0; i < NCSI_FILTER_MAX; i++) {
318 ncf = nc->filters[i];
322 nc->filters[i] = NULL;
326 nc->state = NCSI_CHANNEL_INACTIVE;
327 spin_unlock_irqrestore(&nc->lock, flags);
328 ncsi_stop_channel_monitor(nc);
330 /* Remove and free channel */
331 spin_lock_irqsave(&np->lock, flags);
332 list_del_rcu(&nc->node);
334 spin_unlock_irqrestore(&np->lock, flags);
339 struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
342 struct ncsi_package *np;
344 NCSI_FOR_EACH_PACKAGE(ndp, np) {
352 struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
355 struct ncsi_package *np, *tmp;
358 np = kzalloc(sizeof(*np), GFP_ATOMIC);
364 spin_lock_init(&np->lock);
365 INIT_LIST_HEAD(&np->channels);
367 spin_lock_irqsave(&ndp->lock, flags);
368 tmp = ncsi_find_package(ndp, id);
370 spin_unlock_irqrestore(&ndp->lock, flags);
375 list_add_tail_rcu(&np->node, &ndp->packages);
377 spin_unlock_irqrestore(&ndp->lock, flags);
382 void ncsi_remove_package(struct ncsi_package *np)
384 struct ncsi_dev_priv *ndp = np->ndp;
385 struct ncsi_channel *nc, *tmp;
388 /* Release all child channels */
389 list_for_each_entry_safe(nc, tmp, &np->channels, node)
390 ncsi_remove_channel(nc);
392 /* Remove and free package */
393 spin_lock_irqsave(&ndp->lock, flags);
394 list_del_rcu(&np->node);
396 spin_unlock_irqrestore(&ndp->lock, flags);
401 void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
403 struct ncsi_package **np,
404 struct ncsi_channel **nc)
406 struct ncsi_package *p;
407 struct ncsi_channel *c;
409 p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
410 c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;
418 /* For two consecutive NCSI commands, the packet IDs shouldn't
419 * be same. Otherwise, the bogus response might be replied. So
420 * the available IDs are allocated in round-robin fashion.
422 struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp, bool driven)
424 struct ncsi_request *nr = NULL;
425 int i, limit = ARRAY_SIZE(ndp->requests);
428 /* Check if there is one available request until the ceiling */
429 spin_lock_irqsave(&ndp->lock, flags);
430 for (i = ndp->request_id; i < limit; i++) {
431 if (ndp->requests[i].used)
434 nr = &ndp->requests[i];
437 ndp->request_id = i + 1;
441 /* Fail back to check from the starting cursor */
442 for (i = NCSI_REQ_START_IDX; i < ndp->request_id; i++) {
443 if (ndp->requests[i].used)
446 nr = &ndp->requests[i];
449 ndp->request_id = i + 1;
454 spin_unlock_irqrestore(&ndp->lock, flags);
458 void ncsi_free_request(struct ncsi_request *nr)
460 struct ncsi_dev_priv *ndp = nr->ndp;
461 struct sk_buff *cmd, *rsp;
467 del_timer_sync(&nr->timer);
470 spin_lock_irqsave(&ndp->lock, flags);
477 spin_unlock_irqrestore(&ndp->lock, flags);
479 if (driven && cmd && --ndp->pending_req_num == 0)
480 schedule_work(&ndp->work);
482 /* Release command and response */
487 struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
489 struct ncsi_dev_priv *ndp;
491 NCSI_FOR_EACH_DEV(ndp) {
492 if (ndp->ndev.dev == dev)
499 static void ncsi_request_timeout(unsigned long data)
501 struct ncsi_request *nr = (struct ncsi_request *)data;
502 struct ncsi_dev_priv *ndp = nr->ndp;
505 /* If the request already had associated response,
506 * let the response handler to release it.
508 spin_lock_irqsave(&ndp->lock, flags);
510 if (nr->rsp || !nr->cmd) {
511 spin_unlock_irqrestore(&ndp->lock, flags);
514 spin_unlock_irqrestore(&ndp->lock, flags);
516 /* Release the request */
517 ncsi_free_request(nr);
520 static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
522 struct ncsi_dev *nd = &ndp->ndev;
523 struct ncsi_package *np = ndp->active_package;
524 struct ncsi_channel *nc = ndp->active_channel;
525 struct ncsi_cmd_arg nca;
532 case ncsi_dev_state_suspend:
533 nd->state = ncsi_dev_state_suspend_select;
535 case ncsi_dev_state_suspend_select:
536 case ncsi_dev_state_suspend_dcnt:
537 case ncsi_dev_state_suspend_dc:
538 case ncsi_dev_state_suspend_deselect:
539 ndp->pending_req_num = 1;
541 np = ndp->active_package;
542 nc = ndp->active_channel;
543 nca.package = np->id;
544 if (nd->state == ncsi_dev_state_suspend_select) {
545 nca.type = NCSI_PKT_CMD_SP;
546 nca.channel = NCSI_RESERVED_CHANNEL;
547 if (ndp->flags & NCSI_DEV_HWA)
551 nd->state = ncsi_dev_state_suspend_dcnt;
552 } else if (nd->state == ncsi_dev_state_suspend_dcnt) {
553 nca.type = NCSI_PKT_CMD_DCNT;
554 nca.channel = nc->id;
555 nd->state = ncsi_dev_state_suspend_dc;
556 } else if (nd->state == ncsi_dev_state_suspend_dc) {
557 nca.type = NCSI_PKT_CMD_DC;
558 nca.channel = nc->id;
560 nd->state = ncsi_dev_state_suspend_deselect;
561 } else if (nd->state == ncsi_dev_state_suspend_deselect) {
562 nca.type = NCSI_PKT_CMD_DP;
563 nca.channel = NCSI_RESERVED_CHANNEL;
564 nd->state = ncsi_dev_state_suspend_done;
567 ret = ncsi_xmit_cmd(&nca);
569 nd->state = ncsi_dev_state_functional;
574 case ncsi_dev_state_suspend_done:
575 spin_lock_irqsave(&nc->lock, flags);
576 nc->state = NCSI_CHANNEL_INACTIVE;
577 spin_unlock_irqrestore(&nc->lock, flags);
578 ncsi_process_next_channel(ndp);
582 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in suspend\n",
587 static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
589 struct ncsi_dev *nd = &ndp->ndev;
590 struct net_device *dev = nd->dev;
591 struct ncsi_package *np = ndp->active_package;
592 struct ncsi_channel *nc = ndp->active_channel;
593 struct ncsi_cmd_arg nca;
601 case ncsi_dev_state_config:
602 case ncsi_dev_state_config_sp:
603 ndp->pending_req_num = 1;
605 /* Select the specific package */
606 nca.type = NCSI_PKT_CMD_SP;
607 if (ndp->flags & NCSI_DEV_HWA)
611 nca.package = np->id;
612 nca.channel = NCSI_RESERVED_CHANNEL;
613 ret = ncsi_xmit_cmd(&nca);
617 nd->state = ncsi_dev_state_config_cis;
619 case ncsi_dev_state_config_cis:
620 ndp->pending_req_num = 1;
622 /* Clear initial state */
623 nca.type = NCSI_PKT_CMD_CIS;
624 nca.package = np->id;
625 nca.channel = nc->id;
626 ret = ncsi_xmit_cmd(&nca);
630 nd->state = ncsi_dev_state_config_sma;
632 case ncsi_dev_state_config_sma:
633 case ncsi_dev_state_config_ebf:
634 #if IS_ENABLED(CONFIG_IPV6)
635 case ncsi_dev_state_config_egmf:
637 case ncsi_dev_state_config_ecnt:
638 case ncsi_dev_state_config_ec:
639 case ncsi_dev_state_config_ae:
640 case ncsi_dev_state_config_gls:
641 ndp->pending_req_num = 1;
643 nca.package = np->id;
644 nca.channel = nc->id;
646 /* Use first entry in unicast filter table. Note that
647 * the MAC filter table starts from entry 1 instead of
650 if (nd->state == ncsi_dev_state_config_sma) {
651 nca.type = NCSI_PKT_CMD_SMA;
652 for (index = 0; index < 6; index++)
653 nca.bytes[index] = dev->dev_addr[index];
656 nd->state = ncsi_dev_state_config_ebf;
657 } else if (nd->state == ncsi_dev_state_config_ebf) {
658 nca.type = NCSI_PKT_CMD_EBF;
659 nca.dwords[0] = nc->caps[NCSI_CAP_BC].cap;
660 nd->state = ncsi_dev_state_config_ecnt;
661 #if IS_ENABLED(CONFIG_IPV6)
662 if (ndp->inet6_addr_num > 0 &&
663 (nc->caps[NCSI_CAP_GENERIC].cap &
664 NCSI_CAP_GENERIC_MC))
665 nd->state = ncsi_dev_state_config_egmf;
667 nd->state = ncsi_dev_state_config_ecnt;
668 } else if (nd->state == ncsi_dev_state_config_egmf) {
669 nca.type = NCSI_PKT_CMD_EGMF;
670 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
671 nd->state = ncsi_dev_state_config_ecnt;
672 #endif /* CONFIG_IPV6 */
673 } else if (nd->state == ncsi_dev_state_config_ecnt) {
674 nca.type = NCSI_PKT_CMD_ECNT;
675 nd->state = ncsi_dev_state_config_ec;
676 } else if (nd->state == ncsi_dev_state_config_ec) {
677 /* Enable AEN if it's supported */
678 nca.type = NCSI_PKT_CMD_EC;
679 nd->state = ncsi_dev_state_config_ae;
680 if (!(nc->caps[NCSI_CAP_AEN].cap & NCSI_CAP_AEN_MASK))
681 nd->state = ncsi_dev_state_config_gls;
682 } else if (nd->state == ncsi_dev_state_config_ae) {
683 nca.type = NCSI_PKT_CMD_AE;
685 nca.dwords[1] = nc->caps[NCSI_CAP_AEN].cap;
686 nd->state = ncsi_dev_state_config_gls;
687 } else if (nd->state == ncsi_dev_state_config_gls) {
688 nca.type = NCSI_PKT_CMD_GLS;
689 nd->state = ncsi_dev_state_config_done;
692 ret = ncsi_xmit_cmd(&nca);
696 case ncsi_dev_state_config_done:
697 spin_lock_irqsave(&nc->lock, flags);
698 if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1)
699 nc->state = NCSI_CHANNEL_ACTIVE;
701 nc->state = NCSI_CHANNEL_INACTIVE;
702 spin_unlock_irqrestore(&nc->lock, flags);
704 ncsi_start_channel_monitor(nc);
705 ncsi_process_next_channel(ndp);
708 netdev_warn(dev, "Wrong NCSI state 0x%x in config\n",
715 ncsi_report_link(ndp, true);
718 static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
720 struct ncsi_package *np;
721 struct ncsi_channel *nc, *found;
722 struct ncsi_channel_mode *ncm;
725 /* The search is done once an inactive channel with up
729 NCSI_FOR_EACH_PACKAGE(ndp, np) {
730 NCSI_FOR_EACH_CHANNEL(np, nc) {
731 spin_lock_irqsave(&nc->lock, flags);
733 if (!list_empty(&nc->link) ||
734 nc->state != NCSI_CHANNEL_INACTIVE) {
735 spin_unlock_irqrestore(&nc->lock, flags);
742 ncm = &nc->modes[NCSI_MODE_LINK];
743 if (ncm->data[2] & 0x1) {
744 spin_unlock_irqrestore(&nc->lock, flags);
749 spin_unlock_irqrestore(&nc->lock, flags);
754 ncsi_report_link(ndp, true);
759 spin_lock_irqsave(&ndp->lock, flags);
760 list_add_tail_rcu(&found->link, &ndp->channel_queue);
761 spin_unlock_irqrestore(&ndp->lock, flags);
763 return ncsi_process_next_channel(ndp);
766 static bool ncsi_check_hwa(struct ncsi_dev_priv *ndp)
768 struct ncsi_package *np;
769 struct ncsi_channel *nc;
772 /* The hardware arbitration is disabled if any one channel
773 * doesn't support explicitly.
775 NCSI_FOR_EACH_PACKAGE(ndp, np) {
776 NCSI_FOR_EACH_CHANNEL(np, nc) {
777 cap = nc->caps[NCSI_CAP_GENERIC].cap;
778 if (!(cap & NCSI_CAP_GENERIC_HWA) ||
779 (cap & NCSI_CAP_GENERIC_HWA_MASK) !=
780 NCSI_CAP_GENERIC_HWA_SUPPORT) {
781 ndp->flags &= ~NCSI_DEV_HWA;
787 ndp->flags |= NCSI_DEV_HWA;
791 static int ncsi_enable_hwa(struct ncsi_dev_priv *ndp)
793 struct ncsi_package *np;
794 struct ncsi_channel *nc;
797 /* Move all available channels to processing queue */
798 spin_lock_irqsave(&ndp->lock, flags);
799 NCSI_FOR_EACH_PACKAGE(ndp, np) {
800 NCSI_FOR_EACH_CHANNEL(np, nc) {
801 WARN_ON_ONCE(nc->state != NCSI_CHANNEL_INACTIVE ||
802 !list_empty(&nc->link));
803 ncsi_stop_channel_monitor(nc);
804 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
807 spin_unlock_irqrestore(&ndp->lock, flags);
809 /* We can have no channels in extremely case */
810 if (list_empty(&ndp->channel_queue)) {
811 ncsi_report_link(ndp, false);
815 return ncsi_process_next_channel(ndp);
818 static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
820 struct ncsi_dev *nd = &ndp->ndev;
821 struct ncsi_package *np;
822 struct ncsi_channel *nc;
823 struct ncsi_cmd_arg nca;
830 case ncsi_dev_state_probe:
831 nd->state = ncsi_dev_state_probe_deselect;
833 case ncsi_dev_state_probe_deselect:
834 ndp->pending_req_num = 8;
836 /* Deselect all possible packages */
837 nca.type = NCSI_PKT_CMD_DP;
838 nca.channel = NCSI_RESERVED_CHANNEL;
839 for (index = 0; index < 8; index++) {
841 ret = ncsi_xmit_cmd(&nca);
846 nd->state = ncsi_dev_state_probe_package;
848 case ncsi_dev_state_probe_package:
849 ndp->pending_req_num = 16;
851 /* Select all possible packages */
852 nca.type = NCSI_PKT_CMD_SP;
854 nca.channel = NCSI_RESERVED_CHANNEL;
855 for (index = 0; index < 8; index++) {
857 ret = ncsi_xmit_cmd(&nca);
862 /* Disable all possible packages */
863 nca.type = NCSI_PKT_CMD_DP;
864 for (index = 0; index < 8; index++) {
866 ret = ncsi_xmit_cmd(&nca);
871 nd->state = ncsi_dev_state_probe_channel;
873 case ncsi_dev_state_probe_channel:
874 if (!ndp->active_package)
875 ndp->active_package = list_first_or_null_rcu(
876 &ndp->packages, struct ncsi_package, node);
877 else if (list_is_last(&ndp->active_package->node,
879 ndp->active_package = NULL;
881 ndp->active_package = list_next_entry(
882 ndp->active_package, node);
884 /* All available packages and channels are enumerated. The
885 * enumeration happens for once when the NCSI interface is
886 * started. So we need continue to start the interface after
889 * We have to choose an active channel before configuring it.
890 * Note that we possibly don't have active channel in extreme
893 if (!ndp->active_package) {
894 ndp->flags |= NCSI_DEV_PROBED;
895 if (ncsi_check_hwa(ndp))
896 ncsi_enable_hwa(ndp);
898 ncsi_choose_active_channel(ndp);
902 /* Select the active package */
903 ndp->pending_req_num = 1;
904 nca.type = NCSI_PKT_CMD_SP;
906 nca.package = ndp->active_package->id;
907 nca.channel = NCSI_RESERVED_CHANNEL;
908 ret = ncsi_xmit_cmd(&nca);
912 nd->state = ncsi_dev_state_probe_cis;
914 case ncsi_dev_state_probe_cis:
915 ndp->pending_req_num = NCSI_RESERVED_CHANNEL;
917 /* Clear initial state */
918 nca.type = NCSI_PKT_CMD_CIS;
919 nca.package = ndp->active_package->id;
920 for (index = 0; index < NCSI_RESERVED_CHANNEL; index++) {
922 ret = ncsi_xmit_cmd(&nca);
927 nd->state = ncsi_dev_state_probe_gvi;
929 case ncsi_dev_state_probe_gvi:
930 case ncsi_dev_state_probe_gc:
931 case ncsi_dev_state_probe_gls:
932 np = ndp->active_package;
933 ndp->pending_req_num = np->channel_num;
935 /* Retrieve version, capability or link status */
936 if (nd->state == ncsi_dev_state_probe_gvi)
937 nca.type = NCSI_PKT_CMD_GVI;
938 else if (nd->state == ncsi_dev_state_probe_gc)
939 nca.type = NCSI_PKT_CMD_GC;
941 nca.type = NCSI_PKT_CMD_GLS;
943 nca.package = np->id;
944 NCSI_FOR_EACH_CHANNEL(np, nc) {
945 nca.channel = nc->id;
946 ret = ncsi_xmit_cmd(&nca);
951 if (nd->state == ncsi_dev_state_probe_gvi)
952 nd->state = ncsi_dev_state_probe_gc;
953 else if (nd->state == ncsi_dev_state_probe_gc)
954 nd->state = ncsi_dev_state_probe_gls;
956 nd->state = ncsi_dev_state_probe_dp;
958 case ncsi_dev_state_probe_dp:
959 ndp->pending_req_num = 1;
961 /* Deselect the active package */
962 nca.type = NCSI_PKT_CMD_DP;
963 nca.package = ndp->active_package->id;
964 nca.channel = NCSI_RESERVED_CHANNEL;
965 ret = ncsi_xmit_cmd(&nca);
969 /* Scan channels in next package */
970 nd->state = ncsi_dev_state_probe_channel;
973 netdev_warn(nd->dev, "Wrong NCSI state 0x%0x in enumeration\n",
979 ncsi_report_link(ndp, true);
982 static void ncsi_dev_work(struct work_struct *work)
984 struct ncsi_dev_priv *ndp = container_of(work,
985 struct ncsi_dev_priv, work);
986 struct ncsi_dev *nd = &ndp->ndev;
988 switch (nd->state & ncsi_dev_state_major) {
989 case ncsi_dev_state_probe:
990 ncsi_probe_channel(ndp);
992 case ncsi_dev_state_suspend:
993 ncsi_suspend_channel(ndp);
995 case ncsi_dev_state_config:
996 ncsi_configure_channel(ndp);
999 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in workqueue\n",
1004 int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
1006 struct ncsi_channel *nc;
1008 unsigned long flags;
1010 spin_lock_irqsave(&ndp->lock, flags);
1011 nc = list_first_or_null_rcu(&ndp->channel_queue,
1012 struct ncsi_channel, link);
1014 spin_unlock_irqrestore(&ndp->lock, flags);
1018 list_del_init(&nc->link);
1019 spin_unlock_irqrestore(&ndp->lock, flags);
1021 spin_lock_irqsave(&nc->lock, flags);
1022 old_state = nc->state;
1023 nc->state = NCSI_CHANNEL_INVISIBLE;
1024 spin_unlock_irqrestore(&nc->lock, flags);
1026 ndp->active_channel = nc;
1027 ndp->active_package = nc->package;
1029 switch (old_state) {
1030 case NCSI_CHANNEL_INACTIVE:
1031 ndp->ndev.state = ncsi_dev_state_config;
1032 ncsi_configure_channel(ndp);
1034 case NCSI_CHANNEL_ACTIVE:
1035 ndp->ndev.state = ncsi_dev_state_suspend;
1036 ncsi_suspend_channel(ndp);
1039 netdev_err(ndp->ndev.dev, "Invalid state 0x%x on %d:%d\n",
1040 old_state, nc->package->id, nc->id);
1041 ncsi_report_link(ndp, false);
1048 ndp->active_channel = NULL;
1049 ndp->active_package = NULL;
1050 if (ndp->flags & NCSI_DEV_RESHUFFLE) {
1051 ndp->flags &= ~NCSI_DEV_RESHUFFLE;
1052 return ncsi_choose_active_channel(ndp);
1055 ncsi_report_link(ndp, false);
1059 #if IS_ENABLED(CONFIG_IPV6)
1060 static int ncsi_inet6addr_event(struct notifier_block *this,
1061 unsigned long event, void *data)
1063 struct inet6_ifaddr *ifa = data;
1064 struct net_device *dev = ifa->idev->dev;
1065 struct ncsi_dev *nd = ncsi_find_dev(dev);
1066 struct ncsi_dev_priv *ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
1067 struct ncsi_package *np;
1068 struct ncsi_channel *nc;
1069 struct ncsi_cmd_arg nca;
1073 if (!ndp || (ipv6_addr_type(&ifa->addr) &
1074 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)))
1079 action = (++ndp->inet6_addr_num) == 1;
1080 nca.type = NCSI_PKT_CMD_EGMF;
1083 action = (--ndp->inet6_addr_num == 0);
1084 nca.type = NCSI_PKT_CMD_DGMF;
1090 /* We might not have active channel or packages. The IPv6
1091 * required multicast will be enabled when active channel
1092 * or packages are chosen.
1094 np = ndp->active_package;
1095 nc = ndp->active_channel;
1096 if (!action || !np || !nc)
1099 /* We needn't enable or disable it if the function isn't supported */
1100 if (!(nc->caps[NCSI_CAP_GENERIC].cap & NCSI_CAP_GENERIC_MC))
1105 nca.package = np->id;
1106 nca.channel = nc->id;
1107 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
1108 ret = ncsi_xmit_cmd(&nca);
1110 netdev_warn(dev, "Fail to %s global multicast filter (%d)\n",
1111 (event == NETDEV_UP) ? "enable" : "disable", ret);
1118 static struct notifier_block ncsi_inet6addr_notifier = {
1119 .notifier_call = ncsi_inet6addr_event,
1121 #endif /* CONFIG_IPV6 */
1123 struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
1124 void (*handler)(struct ncsi_dev *ndev))
1126 struct ncsi_dev_priv *ndp;
1127 struct ncsi_dev *nd;
1128 unsigned long flags;
1131 /* Check if the device has been registered or not */
1132 nd = ncsi_find_dev(dev);
1136 /* Create NCSI device */
1137 ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
1142 nd->state = ncsi_dev_state_registered;
1144 nd->handler = handler;
1145 ndp->pending_req_num = 0;
1146 INIT_LIST_HEAD(&ndp->channel_queue);
1147 INIT_WORK(&ndp->work, ncsi_dev_work);
1149 /* Initialize private NCSI device */
1150 spin_lock_init(&ndp->lock);
1151 INIT_LIST_HEAD(&ndp->packages);
1152 ndp->request_id = NCSI_REQ_START_IDX;
1153 for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
1154 ndp->requests[i].id = i;
1155 ndp->requests[i].ndp = ndp;
1156 setup_timer(&ndp->requests[i].timer,
1157 ncsi_request_timeout,
1158 (unsigned long)&ndp->requests[i]);
1161 spin_lock_irqsave(&ncsi_dev_lock, flags);
1162 #if IS_ENABLED(CONFIG_IPV6)
1163 ndp->inet6_addr_num = 0;
1164 if (list_empty(&ncsi_dev_list))
1165 register_inet6addr_notifier(&ncsi_inet6addr_notifier);
1167 list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
1168 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1170 /* Register NCSI packet Rx handler */
1171 ndp->ptype.type = cpu_to_be16(ETH_P_NCSI);
1172 ndp->ptype.func = ncsi_rcv_rsp;
1173 ndp->ptype.dev = dev;
1174 dev_add_pack(&ndp->ptype);
1178 EXPORT_SYMBOL_GPL(ncsi_register_dev);
1180 int ncsi_start_dev(struct ncsi_dev *nd)
1182 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1183 struct ncsi_package *np;
1184 struct ncsi_channel *nc;
1185 unsigned long flags;
1189 if (nd->state != ncsi_dev_state_registered &&
1190 nd->state != ncsi_dev_state_functional)
1193 if (!(ndp->flags & NCSI_DEV_PROBED)) {
1194 nd->state = ncsi_dev_state_probe;
1195 schedule_work(&ndp->work);
1199 /* Reset channel's state and start over */
1200 NCSI_FOR_EACH_PACKAGE(ndp, np) {
1201 NCSI_FOR_EACH_CHANNEL(np, nc) {
1202 spin_lock_irqsave(&nc->lock, flags);
1203 chained = !list_empty(&nc->link);
1204 old_state = nc->state;
1205 nc->state = NCSI_CHANNEL_INACTIVE;
1206 spin_unlock_irqrestore(&nc->lock, flags);
1208 WARN_ON_ONCE(chained ||
1209 old_state == NCSI_CHANNEL_INVISIBLE);
1213 if (ndp->flags & NCSI_DEV_HWA)
1214 ret = ncsi_enable_hwa(ndp);
1216 ret = ncsi_choose_active_channel(ndp);
1220 EXPORT_SYMBOL_GPL(ncsi_start_dev);
1222 void ncsi_unregister_dev(struct ncsi_dev *nd)
1224 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1225 struct ncsi_package *np, *tmp;
1226 unsigned long flags;
1228 dev_remove_pack(&ndp->ptype);
1230 list_for_each_entry_safe(np, tmp, &ndp->packages, node)
1231 ncsi_remove_package(np);
1233 spin_lock_irqsave(&ncsi_dev_lock, flags);
1234 list_del_rcu(&ndp->node);
1235 #if IS_ENABLED(CONFIG_IPV6)
1236 if (list_empty(&ncsi_dev_list))
1237 unregister_inet6addr_notifier(&ncsi_inet6addr_notifier);
1239 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1243 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);