3 * Dynamic Reservation Protocol handling
5 * Copyright (C) 2005-2006 Intel Corporation
6 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
7 * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version
11 * 2 as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include <linux/kthread.h>
22 #include <linux/freezer.h>
23 #include <linux/delay.h>
24 #include "uwb-internal.h"
27 /* DRP Conflict Actions ([ECMA-368 2nd Edition] 17.4.6) */
28 enum uwb_drp_conflict_action {
29 /* Reservation is mantained, no action needed */
30 UWB_DRP_CONFLICT_MANTAIN = 0,
32 /* the device shall not transmit frames in conflicting MASs in
33 * the following superframe. If the device is the reservation
34 * target, it shall also set the Reason Code in its DRP IE to
35 * Conflict in its beacon in the following superframe.
37 UWB_DRP_CONFLICT_ACT1,
39 /* the device shall not set the Reservation Status bit to ONE
40 * and shall not transmit frames in conflicting MASs. If the
41 * device is the reservation target, it shall also set the
42 * Reason Code in its DRP IE to Conflict.
44 UWB_DRP_CONFLICT_ACT2,
46 /* the device shall not transmit frames in conflicting MASs in
47 * the following superframe. It shall remove the conflicting
48 * MASs from the reservation or set the Reservation Status to
49 * ZERO in its beacon in the following superframe. If the
50 * device is the reservation target, it shall also set the
51 * Reason Code in its DRP IE to Conflict.
53 UWB_DRP_CONFLICT_ACT3,
57 static void uwb_rc_set_drp_cmd_done(struct uwb_rc *rc, void *arg,
58 struct uwb_rceb *reply, ssize_t reply_size)
60 struct uwb_rc_evt_set_drp_ie *r = (struct uwb_rc_evt_set_drp_ie *)reply;
63 if (r->bResultCode != UWB_RC_RES_SUCCESS)
64 dev_err(&rc->uwb_dev.dev, "SET-DRP-IE failed: %s (%d)\n",
65 uwb_rc_strerror(r->bResultCode), r->bResultCode);
67 dev_err(&rc->uwb_dev.dev, "SET-DRP-IE: timeout\n");
69 spin_lock_bh(&rc->rsvs_lock);
70 if (rc->set_drp_ie_pending > 1) {
71 rc->set_drp_ie_pending = 0;
72 uwb_rsv_queue_update(rc);
74 rc->set_drp_ie_pending = 0;
76 spin_unlock_bh(&rc->rsvs_lock);
80 * Construct and send the SET DRP IE
82 * @rc: UWB Host controller
83 * @returns: >= 0 number of bytes still available in the beacon
84 * < 0 errno code on error.
86 * See WUSB[8.6.2.7]: The host must set all the DRP IEs that it wants the
87 * device to include in its beacon at the same time. We thus have to
88 * traverse all reservations and include the DRP IEs of all PENDING
89 * and NEGOTIATED reservations in a SET DRP command for transmission.
91 * A DRP Availability IE is appended.
93 * rc->rsvs_mutex is held
95 * FIXME We currently ignore the returned value indicating the remaining space
96 * in beacon. This could be used to deny reservation requests earlier if
97 * determined that they would cause the beacon space to be exceeded.
99 int uwb_rc_send_all_drp_ie(struct uwb_rc *rc)
102 struct uwb_rc_cmd_set_drp_ie *cmd;
104 struct uwb_rsv_move *mv;
109 /* First traverse all reservations to determine memory needed. */
110 list_for_each_entry(rsv, &rc->reservations, rc_node) {
111 if (rsv->drp_ie != NULL) {
112 num_bytes += rsv->drp_ie->hdr.length + 2;
113 if (uwb_rsv_has_two_drp_ies(rsv) &&
114 (rsv->mv.companion_drp_ie != NULL)) {
116 num_bytes += mv->companion_drp_ie->hdr.length + 2;
120 num_bytes += sizeof(rc->drp_avail.ie);
121 cmd = kzalloc(sizeof(*cmd) + num_bytes, GFP_KERNEL);
124 cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
125 cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SET_DRP_IE);
126 cmd->wIELength = num_bytes;
127 IEDataptr = (u8 *)&cmd->IEData[0];
129 /* FIXME: DRV avail IE is not always needed */
130 /* put DRP avail IE first */
131 memcpy(IEDataptr, &rc->drp_avail.ie, sizeof(rc->drp_avail.ie));
132 IEDataptr += sizeof(struct uwb_ie_drp_avail);
134 /* Next traverse all reservations to place IEs in allocated memory. */
135 list_for_each_entry(rsv, &rc->reservations, rc_node) {
136 if (rsv->drp_ie != NULL) {
137 memcpy(IEDataptr, rsv->drp_ie,
138 rsv->drp_ie->hdr.length + 2);
139 IEDataptr += rsv->drp_ie->hdr.length + 2;
141 if (uwb_rsv_has_two_drp_ies(rsv) &&
142 (rsv->mv.companion_drp_ie != NULL)) {
144 memcpy(IEDataptr, mv->companion_drp_ie,
145 mv->companion_drp_ie->hdr.length + 2);
146 IEDataptr += mv->companion_drp_ie->hdr.length + 2;
151 result = uwb_rc_cmd_async(rc, "SET-DRP-IE", &cmd->rccb, sizeof(*cmd) + num_bytes,
152 UWB_RC_CET_GENERAL, UWB_RC_CMD_SET_DRP_IE,
153 uwb_rc_set_drp_cmd_done, NULL);
155 rc->set_drp_ie_pending = 1;
163 * Evaluate the action to perform using conflict resolution rules
165 * Return a uwb_drp_conflict_action.
167 static int evaluate_conflict_action(struct uwb_ie_drp *ext_drp_ie, int ext_beacon_slot,
168 struct uwb_rsv *rsv, int our_status)
170 int our_tie_breaker = rsv->tiebreaker;
171 int our_type = rsv->type;
172 int our_beacon_slot = rsv->rc->uwb_dev.beacon_slot;
174 int ext_tie_breaker = uwb_ie_drp_tiebreaker(ext_drp_ie);
175 int ext_status = uwb_ie_drp_status(ext_drp_ie);
176 int ext_type = uwb_ie_drp_type(ext_drp_ie);
179 /* [ECMA-368 2nd Edition] 17.4.6 */
180 if (ext_type == UWB_DRP_TYPE_PCA && our_type == UWB_DRP_TYPE_PCA) {
181 return UWB_DRP_CONFLICT_MANTAIN;
184 /* [ECMA-368 2nd Edition] 17.4.6-1 */
185 if (our_type == UWB_DRP_TYPE_ALIEN_BP) {
186 return UWB_DRP_CONFLICT_MANTAIN;
189 /* [ECMA-368 2nd Edition] 17.4.6-2 */
190 if (ext_type == UWB_DRP_TYPE_ALIEN_BP) {
191 /* here we know our_type != UWB_DRP_TYPE_ALIEN_BP */
192 return UWB_DRP_CONFLICT_ACT1;
195 /* [ECMA-368 2nd Edition] 17.4.6-3 */
196 if (our_status == 0 && ext_status == 1) {
197 return UWB_DRP_CONFLICT_ACT2;
200 /* [ECMA-368 2nd Edition] 17.4.6-4 */
201 if (our_status == 1 && ext_status == 0) {
202 return UWB_DRP_CONFLICT_MANTAIN;
205 /* [ECMA-368 2nd Edition] 17.4.6-5a */
206 if (our_tie_breaker == ext_tie_breaker &&
207 our_beacon_slot < ext_beacon_slot) {
208 return UWB_DRP_CONFLICT_MANTAIN;
211 /* [ECMA-368 2nd Edition] 17.4.6-5b */
212 if (our_tie_breaker != ext_tie_breaker &&
213 our_beacon_slot > ext_beacon_slot) {
214 return UWB_DRP_CONFLICT_MANTAIN;
217 if (our_status == 0) {
218 if (our_tie_breaker == ext_tie_breaker) {
219 /* [ECMA-368 2nd Edition] 17.4.6-6a */
220 if (our_beacon_slot > ext_beacon_slot) {
221 return UWB_DRP_CONFLICT_ACT2;
224 /* [ECMA-368 2nd Edition] 17.4.6-6b */
225 if (our_beacon_slot < ext_beacon_slot) {
226 return UWB_DRP_CONFLICT_ACT2;
230 if (our_tie_breaker == ext_tie_breaker) {
231 /* [ECMA-368 2nd Edition] 17.4.6-7a */
232 if (our_beacon_slot > ext_beacon_slot) {
233 return UWB_DRP_CONFLICT_ACT3;
236 /* [ECMA-368 2nd Edition] 17.4.6-7b */
237 if (our_beacon_slot < ext_beacon_slot) {
238 return UWB_DRP_CONFLICT_ACT3;
242 return UWB_DRP_CONFLICT_MANTAIN;
245 static void handle_conflict_normal(struct uwb_ie_drp *drp_ie,
248 struct uwb_mas_bm *conflicting_mas)
250 struct uwb_rc *rc = rsv->rc;
251 struct uwb_rsv_move *mv = &rsv->mv;
252 struct uwb_drp_backoff_win *bow = &rc->bow;
255 action = evaluate_conflict_action(drp_ie, ext_beacon_slot, rsv, uwb_rsv_status(rsv));
257 if (uwb_rsv_is_owner(rsv)) {
259 case UWB_DRP_CONFLICT_ACT2:
261 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_TO_BE_MOVED);
262 if (bow->can_reserve_extra_mases == false)
263 uwb_rsv_backoff_win_increment(rc);
266 case UWB_DRP_CONFLICT_ACT3:
267 uwb_rsv_backoff_win_increment(rc);
268 /* drop some mases with reason modified */
269 /* put in the companion the mases to be dropped */
270 bitmap_and(mv->companion_mas.bm, rsv->mas.bm, conflicting_mas->bm, UWB_NUM_MAS);
271 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MODIFIED);
277 case UWB_DRP_CONFLICT_ACT2:
278 case UWB_DRP_CONFLICT_ACT3:
279 uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_CONFLICT);
288 static void handle_conflict_expanding(struct uwb_ie_drp *drp_ie, int ext_beacon_slot,
289 struct uwb_rsv *rsv, bool companion_only,
290 struct uwb_mas_bm *conflicting_mas)
292 struct uwb_rc *rc = rsv->rc;
293 struct uwb_drp_backoff_win *bow = &rc->bow;
294 struct uwb_rsv_move *mv = &rsv->mv;
297 if (companion_only) {
298 /* status of companion is 0 at this point */
299 action = evaluate_conflict_action(drp_ie, ext_beacon_slot, rsv, 0);
300 if (uwb_rsv_is_owner(rsv)) {
302 case UWB_DRP_CONFLICT_ACT2:
303 case UWB_DRP_CONFLICT_ACT3:
304 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
305 rsv->needs_release_companion_mas = false;
306 if (bow->can_reserve_extra_mases == false)
307 uwb_rsv_backoff_win_increment(rc);
308 uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas);
310 } else { /* rsv is target */
312 case UWB_DRP_CONFLICT_ACT2:
313 case UWB_DRP_CONFLICT_ACT3:
314 uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_EXPANDING_CONFLICT);
315 /* send_drp_avail_ie = true; */
318 } else { /* also base part of the reservation is conflicting */
319 if (uwb_rsv_is_owner(rsv)) {
320 uwb_rsv_backoff_win_increment(rc);
321 /* remove companion part */
322 uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas);
324 /* drop some mases with reason modified */
326 /* put in the companion the mases to be dropped */
327 bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, conflicting_mas->bm, UWB_NUM_MAS);
328 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MODIFIED);
329 } else { /* it is a target rsv */
330 uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_CONFLICT);
331 /* send_drp_avail_ie = true; */
336 static void uwb_drp_handle_conflict_rsv(struct uwb_rc *rc, struct uwb_rsv *rsv,
337 struct uwb_rc_evt_drp *drp_evt,
338 struct uwb_ie_drp *drp_ie,
339 struct uwb_mas_bm *conflicting_mas)
341 struct uwb_rsv_move *mv;
343 /* check if the conflicting reservation has two drp_ies */
344 if (uwb_rsv_has_two_drp_ies(rsv)) {
346 if (bitmap_intersects(rsv->mas.bm, conflicting_mas->bm, UWB_NUM_MAS)) {
347 handle_conflict_expanding(drp_ie, drp_evt->beacon_slot_number,
348 rsv, false, conflicting_mas);
350 if (bitmap_intersects(mv->companion_mas.bm, conflicting_mas->bm, UWB_NUM_MAS)) {
351 handle_conflict_expanding(drp_ie, drp_evt->beacon_slot_number,
352 rsv, true, conflicting_mas);
355 } else if (bitmap_intersects(rsv->mas.bm, conflicting_mas->bm, UWB_NUM_MAS)) {
356 handle_conflict_normal(drp_ie, drp_evt->beacon_slot_number, rsv, conflicting_mas);
360 static void uwb_drp_handle_all_conflict_rsv(struct uwb_rc *rc,
361 struct uwb_rc_evt_drp *drp_evt,
362 struct uwb_ie_drp *drp_ie,
363 struct uwb_mas_bm *conflicting_mas)
367 list_for_each_entry(rsv, &rc->reservations, rc_node) {
368 uwb_drp_handle_conflict_rsv(rc, rsv, drp_evt, drp_ie, conflicting_mas);
373 * Based on the DRP IE, transition a target reservation to a new
376 static void uwb_drp_process_target(struct uwb_rc *rc, struct uwb_rsv *rsv,
377 struct uwb_ie_drp *drp_ie, struct uwb_rc_evt_drp *drp_evt)
379 struct device *dev = &rc->uwb_dev.dev;
380 struct uwb_rsv_move *mv = &rsv->mv;
382 enum uwb_drp_reason reason_code;
383 struct uwb_mas_bm mas;
385 status = uwb_ie_drp_status(drp_ie);
386 reason_code = uwb_ie_drp_reason_code(drp_ie);
387 uwb_drp_ie_to_bm(&mas, drp_ie);
389 switch (reason_code) {
390 case UWB_DRP_REASON_ACCEPTED:
392 if (rsv->state == UWB_RSV_STATE_T_CONFLICT) {
393 uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_CONFLICT);
397 if (rsv->state == UWB_RSV_STATE_T_EXPANDING_ACCEPTED) {
398 /* drp_ie is companion */
399 if (!bitmap_equal(rsv->mas.bm, mas.bm, UWB_NUM_MAS))
400 /* stroke companion */
401 uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_EXPANDING_ACCEPTED);
403 if (!bitmap_equal(rsv->mas.bm, mas.bm, UWB_NUM_MAS)) {
404 if (uwb_drp_avail_reserve_pending(rc, &mas) == -EBUSY) {
405 /* FIXME: there is a conflict, find
406 * the conflicting reservations and
407 * take a sensible action. Consider
408 * that in drp_ie there is the
410 uwb_drp_handle_all_conflict_rsv(rc, drp_evt, drp_ie, &mas);
412 /* accept the extra reservation */
413 bitmap_copy(mv->companion_mas.bm, mas.bm, UWB_NUM_MAS);
414 uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_EXPANDING_ACCEPTED);
418 uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED);
425 case UWB_DRP_REASON_MODIFIED:
426 /* check to see if we have already modified the reservation */
427 if (bitmap_equal(rsv->mas.bm, mas.bm, UWB_NUM_MAS)) {
428 uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED);
432 /* find if the owner wants to expand or reduce */
433 if (bitmap_subset(mas.bm, rsv->mas.bm, UWB_NUM_MAS)) {
434 /* owner is reducing */
435 bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, mas.bm, UWB_NUM_MAS);
436 uwb_drp_avail_release(rsv->rc, &mv->companion_mas);
439 bitmap_copy(rsv->mas.bm, mas.bm, UWB_NUM_MAS);
440 uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_RESIZED);
443 dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n",
444 reason_code, status);
449 * Based on the DRP IE, transition an owner reservation to a new
452 static void uwb_drp_process_owner(struct uwb_rc *rc, struct uwb_rsv *rsv,
453 struct uwb_dev *src, struct uwb_ie_drp *drp_ie,
454 struct uwb_rc_evt_drp *drp_evt)
456 struct device *dev = &rc->uwb_dev.dev;
457 struct uwb_rsv_move *mv = &rsv->mv;
459 enum uwb_drp_reason reason_code;
460 struct uwb_mas_bm mas;
462 status = uwb_ie_drp_status(drp_ie);
463 reason_code = uwb_ie_drp_reason_code(drp_ie);
464 uwb_drp_ie_to_bm(&mas, drp_ie);
467 switch (reason_code) {
468 case UWB_DRP_REASON_ACCEPTED:
469 switch (rsv->state) {
470 case UWB_RSV_STATE_O_PENDING:
471 case UWB_RSV_STATE_O_INITIATED:
472 case UWB_RSV_STATE_O_ESTABLISHED:
473 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
475 case UWB_RSV_STATE_O_MODIFIED:
476 if (bitmap_equal(mas.bm, rsv->mas.bm, UWB_NUM_MAS)) {
477 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
479 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MODIFIED);
483 case UWB_RSV_STATE_O_MOVE_REDUCING: /* shouldn' t be a problem */
484 if (bitmap_equal(mas.bm, rsv->mas.bm, UWB_NUM_MAS)) {
485 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
487 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING);
490 case UWB_RSV_STATE_O_MOVE_EXPANDING:
491 if (bitmap_equal(mas.bm, mv->companion_mas.bm, UWB_NUM_MAS)) {
492 /* Companion reservation accepted */
493 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING);
495 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING);
498 case UWB_RSV_STATE_O_MOVE_COMBINING:
499 if (bitmap_equal(mas.bm, rsv->mas.bm, UWB_NUM_MAS))
500 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING);
502 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING);
509 dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n",
510 reason_code, status);
513 switch (reason_code) {
514 case UWB_DRP_REASON_PENDING:
515 uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_PENDING);
517 case UWB_DRP_REASON_DENIED:
518 uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
520 case UWB_DRP_REASON_CONFLICT:
521 /* resolve the conflict */
522 bitmap_complement(mas.bm, src->last_availability_bm,
524 uwb_drp_handle_conflict_rsv(rc, rsv, drp_evt, drp_ie, &mas);
527 dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n",
528 reason_code, status);
533 static void uwb_cnflt_alien_stroke_timer(struct uwb_cnflt_alien *cnflt)
535 unsigned timeout_us = UWB_MAX_LOST_BEACONS * UWB_SUPERFRAME_LENGTH_US;
536 mod_timer(&cnflt->timer, jiffies + usecs_to_jiffies(timeout_us));
539 static void uwb_cnflt_update_work(struct work_struct *work)
541 struct uwb_cnflt_alien *cnflt = container_of(work,
542 struct uwb_cnflt_alien,
544 struct uwb_cnflt_alien *c;
545 struct uwb_rc *rc = cnflt->rc;
547 unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE;
549 mutex_lock(&rc->rsvs_mutex);
551 list_del(&cnflt->rc_node);
553 /* update rc global conflicting alien bitmap */
554 bitmap_zero(rc->cnflt_alien_bitmap.bm, UWB_NUM_MAS);
556 list_for_each_entry(c, &rc->cnflt_alien_list, rc_node) {
557 bitmap_or(rc->cnflt_alien_bitmap.bm, rc->cnflt_alien_bitmap.bm, c->mas.bm, UWB_NUM_MAS);
560 queue_delayed_work(rc->rsv_workq, &rc->rsv_alien_bp_work, usecs_to_jiffies(delay_us));
563 mutex_unlock(&rc->rsvs_mutex);
566 static void uwb_cnflt_timer(unsigned long arg)
568 struct uwb_cnflt_alien *cnflt = (struct uwb_cnflt_alien *)arg;
570 queue_work(cnflt->rc->rsv_workq, &cnflt->cnflt_update_work);
574 * We have received an DRP_IE of type Alien BP and we need to make
575 * sure we do not transmit in conflicting MASs.
577 static void uwb_drp_handle_alien_drp(struct uwb_rc *rc, struct uwb_ie_drp *drp_ie)
579 struct device *dev = &rc->uwb_dev.dev;
580 struct uwb_mas_bm mas;
581 struct uwb_cnflt_alien *cnflt;
583 unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE;
585 uwb_drp_ie_to_bm(&mas, drp_ie);
586 bitmap_scnprintf(buf, sizeof(buf), mas.bm, UWB_NUM_MAS);
588 list_for_each_entry(cnflt, &rc->cnflt_alien_list, rc_node) {
589 if (bitmap_equal(cnflt->mas.bm, mas.bm, UWB_NUM_MAS)) {
590 /* Existing alien BP reservation conflicting
591 * bitmap, just reset the timer */
592 uwb_cnflt_alien_stroke_timer(cnflt);
597 /* New alien BP reservation conflicting bitmap */
599 /* alloc and initialize new uwb_cnflt_alien */
600 cnflt = kzalloc(sizeof(struct uwb_cnflt_alien), GFP_KERNEL);
602 dev_err(dev, "failed to alloc uwb_cnflt_alien struct\n");
603 INIT_LIST_HEAD(&cnflt->rc_node);
604 init_timer(&cnflt->timer);
605 cnflt->timer.function = uwb_cnflt_timer;
606 cnflt->timer.data = (unsigned long)cnflt;
609 INIT_WORK(&cnflt->cnflt_update_work, uwb_cnflt_update_work);
611 bitmap_copy(cnflt->mas.bm, mas.bm, UWB_NUM_MAS);
613 list_add_tail(&cnflt->rc_node, &rc->cnflt_alien_list);
615 /* update rc global conflicting alien bitmap */
616 bitmap_or(rc->cnflt_alien_bitmap.bm, rc->cnflt_alien_bitmap.bm, mas.bm, UWB_NUM_MAS);
618 queue_delayed_work(rc->rsv_workq, &rc->rsv_alien_bp_work, usecs_to_jiffies(delay_us));
620 /* start the timer */
621 uwb_cnflt_alien_stroke_timer(cnflt);
624 static void uwb_drp_process_not_involved(struct uwb_rc *rc,
625 struct uwb_rc_evt_drp *drp_evt,
626 struct uwb_ie_drp *drp_ie)
628 struct uwb_mas_bm mas;
630 uwb_drp_ie_to_bm(&mas, drp_ie);
631 uwb_drp_handle_all_conflict_rsv(rc, drp_evt, drp_ie, &mas);
634 static void uwb_drp_process_involved(struct uwb_rc *rc, struct uwb_dev *src,
635 struct uwb_rc_evt_drp *drp_evt,
636 struct uwb_ie_drp *drp_ie)
640 rsv = uwb_rsv_find(rc, src, drp_ie);
643 * No reservation? It's either for a recently
644 * terminated reservation; or the DRP IE couldn't be
645 * processed (e.g., an invalid IE or out of memory).
651 * Do nothing with DRP IEs for reservations that have been
654 if (rsv->state == UWB_RSV_STATE_NONE) {
655 uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
659 if (uwb_ie_drp_owner(drp_ie))
660 uwb_drp_process_target(rc, rsv, drp_ie, drp_evt);
662 uwb_drp_process_owner(rc, rsv, src, drp_ie, drp_evt);
667 static bool uwb_drp_involves_us(struct uwb_rc *rc, struct uwb_ie_drp *drp_ie)
669 return uwb_dev_addr_cmp(&rc->uwb_dev.dev_addr, &drp_ie->dev_addr) == 0;
673 * Process a received DRP IE.
675 static void uwb_drp_process(struct uwb_rc *rc, struct uwb_rc_evt_drp *drp_evt,
676 struct uwb_dev *src, struct uwb_ie_drp *drp_ie)
678 if (uwb_ie_drp_type(drp_ie) == UWB_DRP_TYPE_ALIEN_BP)
679 uwb_drp_handle_alien_drp(rc, drp_ie);
680 else if (uwb_drp_involves_us(rc, drp_ie))
681 uwb_drp_process_involved(rc, src, drp_evt, drp_ie);
683 uwb_drp_process_not_involved(rc, drp_evt, drp_ie);
687 * Process a received DRP Availability IE
689 static void uwb_drp_availability_process(struct uwb_rc *rc, struct uwb_dev *src,
690 struct uwb_ie_drp_avail *drp_availability_ie)
692 bitmap_copy(src->last_availability_bm,
693 drp_availability_ie->bmp, UWB_NUM_MAS);
697 * Process all the DRP IEs (both DRP IEs and the DRP Availability IE)
701 void uwb_drp_process_all(struct uwb_rc *rc, struct uwb_rc_evt_drp *drp_evt,
702 size_t ielen, struct uwb_dev *src_dev)
704 struct device *dev = &rc->uwb_dev.dev;
705 struct uwb_ie_hdr *ie_hdr;
708 ptr = drp_evt->ie_data;
710 ie_hdr = uwb_ie_next(&ptr, &ielen);
714 switch (ie_hdr->element_id) {
715 case UWB_IE_DRP_AVAILABILITY:
716 uwb_drp_availability_process(rc, src_dev, (struct uwb_ie_drp_avail *)ie_hdr);
719 uwb_drp_process(rc, drp_evt, src_dev, (struct uwb_ie_drp *)ie_hdr);
722 dev_warn(dev, "unexpected IE in DRP notification\n");
728 dev_warn(dev, "%d octets remaining in DRP notification\n",
733 * uwbd_evt_handle_rc_drp - handle a DRP_IE event
734 * @evt: the DRP_IE event from the radio controller
736 * This processes DRP notifications from the radio controller, either
737 * initiating a new reservation or transitioning an existing
738 * reservation into a different state.
740 * DRP notifications can occur for three different reasons:
742 * - UWB_DRP_NOTIF_DRP_IE_RECVD: one or more DRP IEs with the RC as
743 * the target or source have been recieved.
745 * These DRP IEs could be new or for an existing reservation.
747 * If the DRP IE for an existing reservation ceases to be to
748 * recieved for at least mMaxLostBeacons, the reservation should be
749 * considered to be terminated. Note that the TERMINATE reason (see
750 * below) may not always be signalled (e.g., the remote device has
751 * two or more reservations established with the RC).
753 * - UWB_DRP_NOTIF_CONFLICT: DRP IEs from any device in the beacon
754 * group conflict with the RC's reservations.
756 * - UWB_DRP_NOTIF_TERMINATE: DRP IEs are no longer being received
757 * from a device (i.e., it's terminated all reservations).
759 * Only the software state of the reservations is changed; the setting
760 * of the radio controller's DRP IEs is done after all the events in
761 * an event buffer are processed. This saves waiting multiple times
762 * for the SET_DRP_IE command to complete.
764 int uwbd_evt_handle_rc_drp(struct uwb_event *evt)
766 struct device *dev = &evt->rc->uwb_dev.dev;
767 struct uwb_rc *rc = evt->rc;
768 struct uwb_rc_evt_drp *drp_evt;
769 size_t ielength, bytes_left;
770 struct uwb_dev_addr src_addr;
771 struct uwb_dev *src_dev;
773 /* Is there enough data to decode the event (and any IEs in
775 if (evt->notif.size < sizeof(*drp_evt)) {
776 dev_err(dev, "DRP event: Not enough data to decode event "
777 "[%zu bytes left, %zu needed]\n",
778 evt->notif.size, sizeof(*drp_evt));
781 bytes_left = evt->notif.size - sizeof(*drp_evt);
782 drp_evt = container_of(evt->notif.rceb, struct uwb_rc_evt_drp, rceb);
783 ielength = le16_to_cpu(drp_evt->ie_length);
784 if (bytes_left != ielength) {
785 dev_err(dev, "DRP event: Not enough data in payload [%zu"
786 "bytes left, %zu declared in the event]\n",
787 bytes_left, ielength);
791 memcpy(src_addr.data, &drp_evt->src_addr, sizeof(src_addr));
792 src_dev = uwb_dev_get_by_devaddr(rc, &src_addr);
795 * A DRP notification from an unrecognized device.
797 * This is probably from a WUSB device that doesn't
798 * have an EUI-48 and therefore doesn't show up in the
799 * UWB device database. It's safe to simply ignore
805 mutex_lock(&rc->rsvs_mutex);
807 /* We do not distinguish from the reason */
808 uwb_drp_process_all(rc, drp_evt, ielength, src_dev);
810 mutex_unlock(&rc->rsvs_mutex);
812 uwb_dev_put(src_dev);