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; !nr && i < limit; i++) {
431 if (ndp->requests[i].used)
434 nr = &ndp->requests[i];
437 if (++ndp->request_id >= limit)
441 /* Fail back to check from the starting cursor */
442 for (i = 0; !nr && i < ndp->request_id; i++) {
443 if (ndp->requests[i].used)
446 nr = &ndp->requests[i];
449 if (++ndp->request_id >= limit)
452 spin_unlock_irqrestore(&ndp->lock, flags);
457 void ncsi_free_request(struct ncsi_request *nr)
459 struct ncsi_dev_priv *ndp = nr->ndp;
460 struct sk_buff *cmd, *rsp;
466 del_timer_sync(&nr->timer);
469 spin_lock_irqsave(&ndp->lock, flags);
476 spin_unlock_irqrestore(&ndp->lock, flags);
478 if (driven && cmd && --ndp->pending_req_num == 0)
479 schedule_work(&ndp->work);
481 /* Release command and response */
486 struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
488 struct ncsi_dev_priv *ndp;
490 NCSI_FOR_EACH_DEV(ndp) {
491 if (ndp->ndev.dev == dev)
498 static void ncsi_request_timeout(unsigned long data)
500 struct ncsi_request *nr = (struct ncsi_request *)data;
501 struct ncsi_dev_priv *ndp = nr->ndp;
504 /* If the request already had associated response,
505 * let the response handler to release it.
507 spin_lock_irqsave(&ndp->lock, flags);
509 if (nr->rsp || !nr->cmd) {
510 spin_unlock_irqrestore(&ndp->lock, flags);
513 spin_unlock_irqrestore(&ndp->lock, flags);
515 /* Release the request */
516 ncsi_free_request(nr);
519 static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
521 struct ncsi_dev *nd = &ndp->ndev;
522 struct ncsi_package *np = ndp->active_package;
523 struct ncsi_channel *nc = ndp->active_channel;
524 struct ncsi_cmd_arg nca;
531 case ncsi_dev_state_suspend:
532 nd->state = ncsi_dev_state_suspend_select;
534 case ncsi_dev_state_suspend_select:
535 case ncsi_dev_state_suspend_dcnt:
536 case ncsi_dev_state_suspend_dc:
537 case ncsi_dev_state_suspend_deselect:
538 ndp->pending_req_num = 1;
540 np = ndp->active_package;
541 nc = ndp->active_channel;
542 nca.package = np->id;
543 if (nd->state == ncsi_dev_state_suspend_select) {
544 nca.type = NCSI_PKT_CMD_SP;
546 if (ndp->flags & NCSI_DEV_HWA)
550 nd->state = ncsi_dev_state_suspend_dcnt;
551 } else if (nd->state == ncsi_dev_state_suspend_dcnt) {
552 nca.type = NCSI_PKT_CMD_DCNT;
553 nca.channel = nc->id;
554 nd->state = ncsi_dev_state_suspend_dc;
555 } else if (nd->state == ncsi_dev_state_suspend_dc) {
556 nca.type = NCSI_PKT_CMD_DC;
557 nca.channel = nc->id;
559 nd->state = ncsi_dev_state_suspend_deselect;
560 } else if (nd->state == ncsi_dev_state_suspend_deselect) {
561 nca.type = NCSI_PKT_CMD_DP;
563 nd->state = ncsi_dev_state_suspend_done;
566 ret = ncsi_xmit_cmd(&nca);
568 nd->state = ncsi_dev_state_functional;
573 case ncsi_dev_state_suspend_done:
574 spin_lock_irqsave(&nc->lock, flags);
575 nc->state = NCSI_CHANNEL_INACTIVE;
576 spin_unlock_irqrestore(&nc->lock, flags);
577 ncsi_process_next_channel(ndp);
581 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in suspend\n",
586 static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
588 struct ncsi_dev *nd = &ndp->ndev;
589 struct net_device *dev = nd->dev;
590 struct ncsi_package *np = ndp->active_package;
591 struct ncsi_channel *nc = ndp->active_channel;
592 struct ncsi_cmd_arg nca;
600 case ncsi_dev_state_config:
601 case ncsi_dev_state_config_sp:
602 ndp->pending_req_num = 1;
604 /* Select the specific package */
605 nca.type = NCSI_PKT_CMD_SP;
606 if (ndp->flags & NCSI_DEV_HWA)
610 nca.package = np->id;
612 ret = ncsi_xmit_cmd(&nca);
616 nd->state = ncsi_dev_state_config_cis;
618 case ncsi_dev_state_config_cis:
619 ndp->pending_req_num = 1;
621 /* Clear initial state */
622 nca.type = NCSI_PKT_CMD_CIS;
623 nca.package = np->id;
624 nca.channel = nc->id;
625 ret = ncsi_xmit_cmd(&nca);
629 nd->state = ncsi_dev_state_config_sma;
631 case ncsi_dev_state_config_sma:
632 case ncsi_dev_state_config_ebf:
633 #if IS_ENABLED(CONFIG_IPV6)
634 case ncsi_dev_state_config_egmf:
636 case ncsi_dev_state_config_ecnt:
637 case ncsi_dev_state_config_ec:
638 case ncsi_dev_state_config_ae:
639 case ncsi_dev_state_config_gls:
640 ndp->pending_req_num = 1;
642 nca.package = np->id;
643 nca.channel = nc->id;
645 /* Use first entry in unicast filter table. Note that
646 * the MAC filter table starts from entry 1 instead of
649 if (nd->state == ncsi_dev_state_config_sma) {
650 nca.type = NCSI_PKT_CMD_SMA;
651 for (index = 0; index < 6; index++)
652 nca.bytes[index] = dev->dev_addr[index];
655 nd->state = ncsi_dev_state_config_ebf;
656 } else if (nd->state == ncsi_dev_state_config_ebf) {
657 nca.type = NCSI_PKT_CMD_EBF;
658 nca.dwords[0] = nc->caps[NCSI_CAP_BC].cap;
659 nd->state = ncsi_dev_state_config_ecnt;
660 #if IS_ENABLED(CONFIG_IPV6)
661 if (ndp->inet6_addr_num > 0 &&
662 (nc->caps[NCSI_CAP_GENERIC].cap &
663 NCSI_CAP_GENERIC_MC))
664 nd->state = ncsi_dev_state_config_egmf;
666 nd->state = ncsi_dev_state_config_ecnt;
667 } else if (nd->state == ncsi_dev_state_config_egmf) {
668 nca.type = NCSI_PKT_CMD_EGMF;
669 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
670 nd->state = ncsi_dev_state_config_ecnt;
671 #endif /* CONFIG_IPV6 */
672 } else if (nd->state == ncsi_dev_state_config_ecnt) {
673 nca.type = NCSI_PKT_CMD_ECNT;
674 nd->state = ncsi_dev_state_config_ec;
675 } else if (nd->state == ncsi_dev_state_config_ec) {
676 /* Enable AEN if it's supported */
677 nca.type = NCSI_PKT_CMD_EC;
678 nd->state = ncsi_dev_state_config_ae;
679 if (!(nc->caps[NCSI_CAP_AEN].cap & NCSI_CAP_AEN_MASK))
680 nd->state = ncsi_dev_state_config_gls;
681 } else if (nd->state == ncsi_dev_state_config_ae) {
682 nca.type = NCSI_PKT_CMD_AE;
684 nca.dwords[1] = nc->caps[NCSI_CAP_AEN].cap;
685 nd->state = ncsi_dev_state_config_gls;
686 } else if (nd->state == ncsi_dev_state_config_gls) {
687 nca.type = NCSI_PKT_CMD_GLS;
688 nd->state = ncsi_dev_state_config_done;
691 ret = ncsi_xmit_cmd(&nca);
695 case ncsi_dev_state_config_done:
696 spin_lock_irqsave(&nc->lock, flags);
697 if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1)
698 nc->state = NCSI_CHANNEL_ACTIVE;
700 nc->state = NCSI_CHANNEL_INACTIVE;
701 spin_unlock_irqrestore(&nc->lock, flags);
703 ncsi_start_channel_monitor(nc);
704 ncsi_process_next_channel(ndp);
707 netdev_warn(dev, "Wrong NCSI state 0x%x in config\n",
714 ncsi_report_link(ndp, true);
717 static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
719 struct ncsi_package *np;
720 struct ncsi_channel *nc, *found;
721 struct ncsi_channel_mode *ncm;
724 /* The search is done once an inactive channel with up
728 NCSI_FOR_EACH_PACKAGE(ndp, np) {
729 NCSI_FOR_EACH_CHANNEL(np, nc) {
730 spin_lock_irqsave(&nc->lock, flags);
732 if (!list_empty(&nc->link) ||
733 nc->state != NCSI_CHANNEL_INACTIVE) {
734 spin_unlock_irqrestore(&nc->lock, flags);
741 ncm = &nc->modes[NCSI_MODE_LINK];
742 if (ncm->data[2] & 0x1) {
743 spin_unlock_irqrestore(&nc->lock, flags);
748 spin_unlock_irqrestore(&nc->lock, flags);
753 ncsi_report_link(ndp, true);
758 spin_lock_irqsave(&ndp->lock, flags);
759 list_add_tail_rcu(&found->link, &ndp->channel_queue);
760 spin_unlock_irqrestore(&ndp->lock, flags);
762 return ncsi_process_next_channel(ndp);
765 static bool ncsi_check_hwa(struct ncsi_dev_priv *ndp)
767 struct ncsi_package *np;
768 struct ncsi_channel *nc;
771 /* The hardware arbitration is disabled if any one channel
772 * doesn't support explicitly.
774 NCSI_FOR_EACH_PACKAGE(ndp, np) {
775 NCSI_FOR_EACH_CHANNEL(np, nc) {
776 cap = nc->caps[NCSI_CAP_GENERIC].cap;
777 if (!(cap & NCSI_CAP_GENERIC_HWA) ||
778 (cap & NCSI_CAP_GENERIC_HWA_MASK) !=
779 NCSI_CAP_GENERIC_HWA_SUPPORT) {
780 ndp->flags &= ~NCSI_DEV_HWA;
786 ndp->flags |= NCSI_DEV_HWA;
790 static int ncsi_enable_hwa(struct ncsi_dev_priv *ndp)
792 struct ncsi_package *np;
793 struct ncsi_channel *nc;
796 /* Move all available channels to processing queue */
797 spin_lock_irqsave(&ndp->lock, flags);
798 NCSI_FOR_EACH_PACKAGE(ndp, np) {
799 NCSI_FOR_EACH_CHANNEL(np, nc) {
800 WARN_ON_ONCE(nc->state != NCSI_CHANNEL_INACTIVE ||
801 !list_empty(&nc->link));
802 ncsi_stop_channel_monitor(nc);
803 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
806 spin_unlock_irqrestore(&ndp->lock, flags);
808 /* We can have no channels in extremely case */
809 if (list_empty(&ndp->channel_queue)) {
810 ncsi_report_link(ndp, false);
814 return ncsi_process_next_channel(ndp);
817 static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
819 struct ncsi_dev *nd = &ndp->ndev;
820 struct ncsi_package *np;
821 struct ncsi_channel *nc;
822 struct ncsi_cmd_arg nca;
829 case ncsi_dev_state_probe:
830 nd->state = ncsi_dev_state_probe_deselect;
832 case ncsi_dev_state_probe_deselect:
833 ndp->pending_req_num = 8;
835 /* Deselect all possible packages */
836 nca.type = NCSI_PKT_CMD_DP;
838 for (index = 0; index < 8; index++) {
840 ret = ncsi_xmit_cmd(&nca);
845 nd->state = ncsi_dev_state_probe_package;
847 case ncsi_dev_state_probe_package:
848 ndp->pending_req_num = 16;
850 /* Select all possible packages */
851 nca.type = NCSI_PKT_CMD_SP;
854 for (index = 0; index < 8; index++) {
856 ret = ncsi_xmit_cmd(&nca);
861 /* Disable all possible packages */
862 nca.type = NCSI_PKT_CMD_DP;
863 for (index = 0; index < 8; index++) {
865 ret = ncsi_xmit_cmd(&nca);
870 nd->state = ncsi_dev_state_probe_channel;
872 case ncsi_dev_state_probe_channel:
873 if (!ndp->active_package)
874 ndp->active_package = list_first_or_null_rcu(
875 &ndp->packages, struct ncsi_package, node);
876 else if (list_is_last(&ndp->active_package->node,
878 ndp->active_package = NULL;
880 ndp->active_package = list_next_entry(
881 ndp->active_package, node);
883 /* All available packages and channels are enumerated. The
884 * enumeration happens for once when the NCSI interface is
885 * started. So we need continue to start the interface after
888 * We have to choose an active channel before configuring it.
889 * Note that we possibly don't have active channel in extreme
892 if (!ndp->active_package) {
893 ndp->flags |= NCSI_DEV_PROBED;
894 if (ncsi_check_hwa(ndp))
895 ncsi_enable_hwa(ndp);
897 ncsi_choose_active_channel(ndp);
901 /* Select the active package */
902 ndp->pending_req_num = 1;
903 nca.type = NCSI_PKT_CMD_SP;
905 nca.package = ndp->active_package->id;
907 ret = ncsi_xmit_cmd(&nca);
911 nd->state = ncsi_dev_state_probe_cis;
913 case ncsi_dev_state_probe_cis:
914 ndp->pending_req_num = 32;
916 /* Clear initial state */
917 nca.type = NCSI_PKT_CMD_CIS;
918 nca.package = ndp->active_package->id;
919 for (index = 0; index < 0x20; index++) {
921 ret = ncsi_xmit_cmd(&nca);
926 nd->state = ncsi_dev_state_probe_gvi;
928 case ncsi_dev_state_probe_gvi:
929 case ncsi_dev_state_probe_gc:
930 case ncsi_dev_state_probe_gls:
931 np = ndp->active_package;
932 ndp->pending_req_num = np->channel_num;
934 /* Retrieve version, capability or link status */
935 if (nd->state == ncsi_dev_state_probe_gvi)
936 nca.type = NCSI_PKT_CMD_GVI;
937 else if (nd->state == ncsi_dev_state_probe_gc)
938 nca.type = NCSI_PKT_CMD_GC;
940 nca.type = NCSI_PKT_CMD_GLS;
942 nca.package = np->id;
943 NCSI_FOR_EACH_CHANNEL(np, nc) {
944 nca.channel = nc->id;
945 ret = ncsi_xmit_cmd(&nca);
950 if (nd->state == ncsi_dev_state_probe_gvi)
951 nd->state = ncsi_dev_state_probe_gc;
952 else if (nd->state == ncsi_dev_state_probe_gc)
953 nd->state = ncsi_dev_state_probe_gls;
955 nd->state = ncsi_dev_state_probe_dp;
957 case ncsi_dev_state_probe_dp:
958 ndp->pending_req_num = 1;
960 /* Deselect the active package */
961 nca.type = NCSI_PKT_CMD_DP;
962 nca.package = ndp->active_package->id;
964 ret = ncsi_xmit_cmd(&nca);
968 /* Scan channels in next package */
969 nd->state = ncsi_dev_state_probe_channel;
972 netdev_warn(nd->dev, "Wrong NCSI state 0x%0x in enumeration\n",
978 ncsi_report_link(ndp, true);
981 static void ncsi_dev_work(struct work_struct *work)
983 struct ncsi_dev_priv *ndp = container_of(work,
984 struct ncsi_dev_priv, work);
985 struct ncsi_dev *nd = &ndp->ndev;
987 switch (nd->state & ncsi_dev_state_major) {
988 case ncsi_dev_state_probe:
989 ncsi_probe_channel(ndp);
991 case ncsi_dev_state_suspend:
992 ncsi_suspend_channel(ndp);
994 case ncsi_dev_state_config:
995 ncsi_configure_channel(ndp);
998 netdev_warn(nd->dev, "Wrong NCSI state 0x%x in workqueue\n",
1003 int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
1005 struct ncsi_channel *nc;
1007 unsigned long flags;
1009 spin_lock_irqsave(&ndp->lock, flags);
1010 nc = list_first_or_null_rcu(&ndp->channel_queue,
1011 struct ncsi_channel, link);
1013 spin_unlock_irqrestore(&ndp->lock, flags);
1017 list_del_init(&nc->link);
1018 spin_unlock_irqrestore(&ndp->lock, flags);
1020 spin_lock_irqsave(&nc->lock, flags);
1021 old_state = nc->state;
1022 nc->state = NCSI_CHANNEL_INVISIBLE;
1023 spin_unlock_irqrestore(&nc->lock, flags);
1025 ndp->active_channel = nc;
1026 ndp->active_package = nc->package;
1028 switch (old_state) {
1029 case NCSI_CHANNEL_INACTIVE:
1030 ndp->ndev.state = ncsi_dev_state_config;
1031 ncsi_configure_channel(ndp);
1033 case NCSI_CHANNEL_ACTIVE:
1034 ndp->ndev.state = ncsi_dev_state_suspend;
1035 ncsi_suspend_channel(ndp);
1038 netdev_err(ndp->ndev.dev, "Invalid state 0x%x on %d:%d\n",
1039 old_state, nc->package->id, nc->id);
1040 ncsi_report_link(ndp, false);
1047 ndp->active_channel = NULL;
1048 ndp->active_package = NULL;
1049 if (ndp->flags & NCSI_DEV_RESHUFFLE) {
1050 ndp->flags &= ~NCSI_DEV_RESHUFFLE;
1051 return ncsi_choose_active_channel(ndp);
1054 ncsi_report_link(ndp, false);
1058 #if IS_ENABLED(CONFIG_IPV6)
1059 static int ncsi_inet6addr_event(struct notifier_block *this,
1060 unsigned long event, void *data)
1062 struct inet6_ifaddr *ifa = data;
1063 struct net_device *dev = ifa->idev->dev;
1064 struct ncsi_dev *nd = ncsi_find_dev(dev);
1065 struct ncsi_dev_priv *ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
1066 struct ncsi_package *np;
1067 struct ncsi_channel *nc;
1068 struct ncsi_cmd_arg nca;
1072 if (!ndp || (ipv6_addr_type(&ifa->addr) &
1073 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)))
1078 action = (++ndp->inet6_addr_num) == 1;
1079 nca.type = NCSI_PKT_CMD_EGMF;
1082 action = (--ndp->inet6_addr_num == 0);
1083 nca.type = NCSI_PKT_CMD_DGMF;
1089 /* We might not have active channel or packages. The IPv6
1090 * required multicast will be enabled when active channel
1091 * or packages are chosen.
1093 np = ndp->active_package;
1094 nc = ndp->active_channel;
1095 if (!action || !np || !nc)
1098 /* We needn't enable or disable it if the function isn't supported */
1099 if (!(nc->caps[NCSI_CAP_GENERIC].cap & NCSI_CAP_GENERIC_MC))
1104 nca.package = np->id;
1105 nca.channel = nc->id;
1106 nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
1107 ret = ncsi_xmit_cmd(&nca);
1109 netdev_warn(dev, "Fail to %s global multicast filter (%d)\n",
1110 (event == NETDEV_UP) ? "enable" : "disable", ret);
1117 static struct notifier_block ncsi_inet6addr_notifier = {
1118 .notifier_call = ncsi_inet6addr_event,
1120 #endif /* CONFIG_IPV6 */
1122 struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
1123 void (*handler)(struct ncsi_dev *ndev))
1125 struct ncsi_dev_priv *ndp;
1126 struct ncsi_dev *nd;
1127 unsigned long flags;
1130 /* Check if the device has been registered or not */
1131 nd = ncsi_find_dev(dev);
1135 /* Create NCSI device */
1136 ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
1141 nd->state = ncsi_dev_state_registered;
1143 nd->handler = handler;
1144 ndp->pending_req_num = 0;
1145 INIT_LIST_HEAD(&ndp->channel_queue);
1146 INIT_WORK(&ndp->work, ncsi_dev_work);
1148 /* Initialize private NCSI device */
1149 spin_lock_init(&ndp->lock);
1150 INIT_LIST_HEAD(&ndp->packages);
1151 ndp->request_id = 0;
1152 for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
1153 ndp->requests[i].id = i;
1154 ndp->requests[i].ndp = ndp;
1155 setup_timer(&ndp->requests[i].timer,
1156 ncsi_request_timeout,
1157 (unsigned long)&ndp->requests[i]);
1160 spin_lock_irqsave(&ncsi_dev_lock, flags);
1161 #if IS_ENABLED(CONFIG_IPV6)
1162 ndp->inet6_addr_num = 0;
1163 if (list_empty(&ncsi_dev_list))
1164 register_inet6addr_notifier(&ncsi_inet6addr_notifier);
1166 list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
1167 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1169 /* Register NCSI packet Rx handler */
1170 ndp->ptype.type = cpu_to_be16(ETH_P_NCSI);
1171 ndp->ptype.func = ncsi_rcv_rsp;
1172 ndp->ptype.dev = dev;
1173 dev_add_pack(&ndp->ptype);
1177 EXPORT_SYMBOL_GPL(ncsi_register_dev);
1179 int ncsi_start_dev(struct ncsi_dev *nd)
1181 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1182 struct ncsi_package *np;
1183 struct ncsi_channel *nc;
1184 unsigned long flags;
1188 if (nd->state != ncsi_dev_state_registered &&
1189 nd->state != ncsi_dev_state_functional)
1192 if (!(ndp->flags & NCSI_DEV_PROBED)) {
1193 nd->state = ncsi_dev_state_probe;
1194 schedule_work(&ndp->work);
1198 /* Reset channel's state and start over */
1199 NCSI_FOR_EACH_PACKAGE(ndp, np) {
1200 NCSI_FOR_EACH_CHANNEL(np, nc) {
1201 spin_lock_irqsave(&nc->lock, flags);
1202 chained = !list_empty(&nc->link);
1203 old_state = nc->state;
1204 nc->state = NCSI_CHANNEL_INACTIVE;
1205 spin_unlock_irqrestore(&nc->lock, flags);
1207 WARN_ON_ONCE(chained ||
1208 old_state == NCSI_CHANNEL_INVISIBLE);
1212 if (ndp->flags & NCSI_DEV_HWA)
1213 ret = ncsi_enable_hwa(ndp);
1215 ret = ncsi_choose_active_channel(ndp);
1219 EXPORT_SYMBOL_GPL(ncsi_start_dev);
1221 void ncsi_unregister_dev(struct ncsi_dev *nd)
1223 struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
1224 struct ncsi_package *np, *tmp;
1225 unsigned long flags;
1227 dev_remove_pack(&ndp->ptype);
1229 list_for_each_entry_safe(np, tmp, &ndp->packages, node)
1230 ncsi_remove_package(np);
1232 spin_lock_irqsave(&ncsi_dev_lock, flags);
1233 list_del_rcu(&ndp->node);
1234 #if IS_ENABLED(CONFIG_IPV6)
1235 if (list_empty(&ncsi_dev_list))
1236 unregister_inet6addr_notifier(&ncsi_inet6addr_notifier);
1238 spin_unlock_irqrestore(&ncsi_dev_lock, flags);
1242 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);