--- /dev/null
+/*
+ * Ultra Wide Band
+ * Dynamic Reservation Protocol handling
+ *
+ * Copyright (C) 2005-2006 Intel Corporation
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include "uwb-internal.h"
+
+
+/* DRP Conflict Actions ([ECMA-368 2nd Edition] 17.4.6) */
+enum uwb_drp_conflict_action {
+ /* Reservation is maintained, no action needed */
+ UWB_DRP_CONFLICT_MANTAIN = 0,
+
+ /* the device shall not transmit frames in conflicting MASs in
+ * the following superframe. If the device is the reservation
+ * target, it shall also set the Reason Code in its DRP IE to
+ * Conflict in its beacon in the following superframe.
+ */
+ UWB_DRP_CONFLICT_ACT1,
+
+ /* the device shall not set the Reservation Status bit to ONE
+ * and shall not transmit frames in conflicting MASs. If the
+ * device is the reservation target, it shall also set the
+ * Reason Code in its DRP IE to Conflict.
+ */
+ UWB_DRP_CONFLICT_ACT2,
+
+ /* the device shall not transmit frames in conflicting MASs in
+ * the following superframe. It shall remove the conflicting
+ * MASs from the reservation or set the Reservation Status to
+ * ZERO in its beacon in the following superframe. If the
+ * device is the reservation target, it shall also set the
+ * Reason Code in its DRP IE to Conflict.
+ */
+ UWB_DRP_CONFLICT_ACT3,
+};
+
+
+static void uwb_rc_set_drp_cmd_done(struct uwb_rc *rc, void *arg,
+ struct uwb_rceb *reply, ssize_t reply_size)
+{
+ struct uwb_rc_evt_set_drp_ie *r = (struct uwb_rc_evt_set_drp_ie *)reply;
+ unsigned long flags;
+
+ if (r != NULL) {
+ if (r->bResultCode != UWB_RC_RES_SUCCESS)
+ dev_err(&rc->uwb_dev.dev, "SET-DRP-IE failed: %s (%d)\n",
+ uwb_rc_strerror(r->bResultCode), r->bResultCode);
+ } else
+ dev_err(&rc->uwb_dev.dev, "SET-DRP-IE: timeout\n");
+
+ spin_lock_irqsave(&rc->rsvs_lock, flags);
+ if (rc->set_drp_ie_pending > 1) {
+ rc->set_drp_ie_pending = 0;
+ uwb_rsv_queue_update(rc);
+ } else {
+ rc->set_drp_ie_pending = 0;
+ }
+ spin_unlock_irqrestore(&rc->rsvs_lock, flags);
+}
+
+/**
+ * Construct and send the SET DRP IE
+ *
+ * @rc: UWB Host controller
+ * @returns: >= 0 number of bytes still available in the beacon
+ * < 0 errno code on error.
+ *
+ * See WUSB[8.6.2.7]: The host must set all the DRP IEs that it wants the
+ * device to include in its beacon at the same time. We thus have to
+ * traverse all reservations and include the DRP IEs of all PENDING
+ * and NEGOTIATED reservations in a SET DRP command for transmission.
+ *
+ * A DRP Availability IE is appended.
+ *
+ * rc->rsvs_mutex is held
+ *
+ * FIXME We currently ignore the returned value indicating the remaining space
+ * in beacon. This could be used to deny reservation requests earlier if
+ * determined that they would cause the beacon space to be exceeded.
+ */
+int uwb_rc_send_all_drp_ie(struct uwb_rc *rc)
+{
+ int result;
+ struct uwb_rc_cmd_set_drp_ie *cmd;
+ struct uwb_rsv *rsv;
+ struct uwb_rsv_move *mv;
+ int num_bytes = 0;
+ u8 *IEDataptr;
+
+ result = -ENOMEM;
+ /* First traverse all reservations to determine memory needed. */
+ list_for_each_entry(rsv, &rc->reservations, rc_node) {
+ if (rsv->drp_ie != NULL) {
+ num_bytes += rsv->drp_ie->hdr.length + 2;
+ if (uwb_rsv_has_two_drp_ies(rsv) &&
+ (rsv->mv.companion_drp_ie != NULL)) {
+ mv = &rsv->mv;
+ num_bytes +=
+ mv->companion_drp_ie->hdr.length + 2;
+ }
+ }
+ }
+ num_bytes += sizeof(rc->drp_avail.ie);
+ cmd = kzalloc(sizeof(*cmd) + num_bytes, GFP_KERNEL);
+ if (cmd == NULL)
+ goto error;
+ cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
+ cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SET_DRP_IE);
+ cmd->wIELength = num_bytes;
+ IEDataptr = (u8 *)&cmd->IEData[0];
+
+ /* FIXME: DRV avail IE is not always needed */
+ /* put DRP avail IE first */
+ memcpy(IEDataptr, &rc->drp_avail.ie, sizeof(rc->drp_avail.ie));
+ IEDataptr += sizeof(struct uwb_ie_drp_avail);
+
+ /* Next traverse all reservations to place IEs in allocated memory. */
+ list_for_each_entry(rsv, &rc->reservations, rc_node) {
+ if (rsv->drp_ie != NULL) {
+ memcpy(IEDataptr, rsv->drp_ie,
+ rsv->drp_ie->hdr.length + 2);
+ IEDataptr += rsv->drp_ie->hdr.length + 2;
+
+ if (uwb_rsv_has_two_drp_ies(rsv) &&
+ (rsv->mv.companion_drp_ie != NULL)) {
+ mv = &rsv->mv;
+ memcpy(IEDataptr, mv->companion_drp_ie,
+ mv->companion_drp_ie->hdr.length + 2);
+ IEDataptr +=
+ mv->companion_drp_ie->hdr.length + 2;
+ }
+ }
+ }
+
+ result = uwb_rc_cmd_async(rc, "SET-DRP-IE",
+ &cmd->rccb, sizeof(*cmd) + num_bytes,
+ UWB_RC_CET_GENERAL, UWB_RC_CMD_SET_DRP_IE,
+ uwb_rc_set_drp_cmd_done, NULL);
+
+ rc->set_drp_ie_pending = 1;
+
+ kfree(cmd);
+error:
+ return result;
+}
+
+/*
+ * Evaluate the action to perform using conflict resolution rules
+ *
+ * Return a uwb_drp_conflict_action.
+ */
+static int evaluate_conflict_action(struct uwb_ie_drp *ext_drp_ie, int ext_beacon_slot,
+ struct uwb_rsv *rsv, int our_status)
+{
+ int our_tie_breaker = rsv->tiebreaker;
+ int our_type = rsv->type;
+ int our_beacon_slot = rsv->rc->uwb_dev.beacon_slot;
+
+ int ext_tie_breaker = uwb_ie_drp_tiebreaker(ext_drp_ie);
+ int ext_status = uwb_ie_drp_status(ext_drp_ie);
+ int ext_type = uwb_ie_drp_type(ext_drp_ie);
+
+
+ /* [ECMA-368 2nd Edition] 17.4.6 */
+ if (ext_type == UWB_DRP_TYPE_PCA && our_type == UWB_DRP_TYPE_PCA) {
+ return UWB_DRP_CONFLICT_MANTAIN;
+ }
+
+ /* [ECMA-368 2nd Edition] 17.4.6-1 */
+ if (our_type == UWB_DRP_TYPE_ALIEN_BP) {
+ return UWB_DRP_CONFLICT_MANTAIN;
+ }
+
+ /* [ECMA-368 2nd Edition] 17.4.6-2 */
+ if (ext_type == UWB_DRP_TYPE_ALIEN_BP) {
+ /* here we know our_type != UWB_DRP_TYPE_ALIEN_BP */
+ return UWB_DRP_CONFLICT_ACT1;
+ }
+
+ /* [ECMA-368 2nd Edition] 17.4.6-3 */
+ if (our_status == 0 && ext_status == 1) {
+ return UWB_DRP_CONFLICT_ACT2;
+ }
+
+ /* [ECMA-368 2nd Edition] 17.4.6-4 */
+ if (our_status == 1 && ext_status == 0) {
+ return UWB_DRP_CONFLICT_MANTAIN;
+ }
+
+ /* [ECMA-368 2nd Edition] 17.4.6-5a */
+ if (our_tie_breaker == ext_tie_breaker &&
+ our_beacon_slot < ext_beacon_slot) {
+ return UWB_DRP_CONFLICT_MANTAIN;
+ }
+
+ /* [ECMA-368 2nd Edition] 17.4.6-5b */
+ if (our_tie_breaker != ext_tie_breaker &&
+ our_beacon_slot > ext_beacon_slot) {
+ return UWB_DRP_CONFLICT_MANTAIN;
+ }
+
+ if (our_status == 0) {
+ if (our_tie_breaker == ext_tie_breaker) {
+ /* [ECMA-368 2nd Edition] 17.4.6-6a */
+ if (our_beacon_slot > ext_beacon_slot) {
+ return UWB_DRP_CONFLICT_ACT2;
+ }
+ } else {
+ /* [ECMA-368 2nd Edition] 17.4.6-6b */
+ if (our_beacon_slot < ext_beacon_slot) {
+ return UWB_DRP_CONFLICT_ACT2;
+ }
+ }
+ } else {
+ if (our_tie_breaker == ext_tie_breaker) {
+ /* [ECMA-368 2nd Edition] 17.4.6-7a */
+ if (our_beacon_slot > ext_beacon_slot) {
+ return UWB_DRP_CONFLICT_ACT3;
+ }
+ } else {
+ /* [ECMA-368 2nd Edition] 17.4.6-7b */
+ if (our_beacon_slot < ext_beacon_slot) {
+ return UWB_DRP_CONFLICT_ACT3;
+ }
+ }
+ }
+ return UWB_DRP_CONFLICT_MANTAIN;
+}
+
+static void handle_conflict_normal(struct uwb_ie_drp *drp_ie,
+ int ext_beacon_slot,
+ struct uwb_rsv *rsv,
+ struct uwb_mas_bm *conflicting_mas)
+{
+ struct uwb_rc *rc = rsv->rc;
+ struct uwb_rsv_move *mv = &rsv->mv;
+ struct uwb_drp_backoff_win *bow = &rc->bow;
+ int action;
+
+ action = evaluate_conflict_action(drp_ie, ext_beacon_slot, rsv, uwb_rsv_status(rsv));
+
+ if (uwb_rsv_is_owner(rsv)) {
+ switch(action) {
+ case UWB_DRP_CONFLICT_ACT2:
+ /* try move */
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_TO_BE_MOVED);
+ if (bow->can_reserve_extra_mases == false)
+ uwb_rsv_backoff_win_increment(rc);
+
+ break;
+ case UWB_DRP_CONFLICT_ACT3:
+ uwb_rsv_backoff_win_increment(rc);
+ /* drop some mases with reason modified */
+ /* put in the companion the mases to be dropped */
+ bitmap_and(mv->companion_mas.bm, rsv->mas.bm, conflicting_mas->bm, UWB_NUM_MAS);
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MODIFIED);
+ default:
+ break;
+ }
+ } else {
+ switch(action) {
+ case UWB_DRP_CONFLICT_ACT2:
+ case UWB_DRP_CONFLICT_ACT3:
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_CONFLICT);
+ default:
+ break;
+ }
+
+ }
+
+}
+
+static void handle_conflict_expanding(struct uwb_ie_drp *drp_ie, int ext_beacon_slot,
+ struct uwb_rsv *rsv, bool companion_only,
+ struct uwb_mas_bm *conflicting_mas)
+{
+ struct uwb_rc *rc = rsv->rc;
+ struct uwb_drp_backoff_win *bow = &rc->bow;
+ struct uwb_rsv_move *mv = &rsv->mv;
+ int action;
+
+ if (companion_only) {
+ /* status of companion is 0 at this point */
+ action = evaluate_conflict_action(drp_ie, ext_beacon_slot, rsv, 0);
+ if (uwb_rsv_is_owner(rsv)) {
+ switch(action) {
+ case UWB_DRP_CONFLICT_ACT2:
+ case UWB_DRP_CONFLICT_ACT3:
+ uwb_rsv_set_state(rsv,
+ UWB_RSV_STATE_O_ESTABLISHED);
+ rsv->needs_release_companion_mas = false;
+ if (bow->can_reserve_extra_mases == false)
+ uwb_rsv_backoff_win_increment(rc);
+ uwb_drp_avail_release(rsv->rc,
+ &rsv->mv.companion_mas);
+ }
+ } else { /* rsv is target */
+ switch(action) {
+ case UWB_DRP_CONFLICT_ACT2:
+ case UWB_DRP_CONFLICT_ACT3:
+ uwb_rsv_set_state(rsv,
+ UWB_RSV_STATE_T_EXPANDING_CONFLICT);
+ /* send_drp_avail_ie = true; */
+ }
+ }
+ } else { /* also base part of the reservation is conflicting */
+ if (uwb_rsv_is_owner(rsv)) {
+ uwb_rsv_backoff_win_increment(rc);
+ /* remove companion part */
+ uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas);
+
+ /* drop some mases with reason modified */
+
+ /* put in the companion the mases to be dropped */
+ bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm,
+ conflicting_mas->bm, UWB_NUM_MAS);
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MODIFIED);
+ } else { /* it is a target rsv */
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_CONFLICT);
+ /* send_drp_avail_ie = true; */
+ }
+ }
+}
+
+static void uwb_drp_handle_conflict_rsv(struct uwb_rc *rc, struct uwb_rsv *rsv,
+ struct uwb_rc_evt_drp *drp_evt,
+ struct uwb_ie_drp *drp_ie,
+ struct uwb_mas_bm *conflicting_mas)
+{
+ struct uwb_rsv_move *mv;
+
+ /* check if the conflicting reservation has two drp_ies */
+ if (uwb_rsv_has_two_drp_ies(rsv)) {
+ mv = &rsv->mv;
+ if (bitmap_intersects(rsv->mas.bm, conflicting_mas->bm,
+ UWB_NUM_MAS)) {
+ handle_conflict_expanding(drp_ie,
+ drp_evt->beacon_slot_number,
+ rsv, false, conflicting_mas);
+ } else {
+ if (bitmap_intersects(mv->companion_mas.bm,
+ conflicting_mas->bm, UWB_NUM_MAS)) {
+ handle_conflict_expanding(
+ drp_ie, drp_evt->beacon_slot_number,
+ rsv, true, conflicting_mas);
+ }
+ }
+ } else if (bitmap_intersects(rsv->mas.bm, conflicting_mas->bm,
+ UWB_NUM_MAS)) {
+ handle_conflict_normal(drp_ie, drp_evt->beacon_slot_number,
+ rsv, conflicting_mas);
+ }
+}
+
+static void uwb_drp_handle_all_conflict_rsv(struct uwb_rc *rc,
+ struct uwb_rc_evt_drp *drp_evt,
+ struct uwb_ie_drp *drp_ie,
+ struct uwb_mas_bm *conflicting_mas)
+{
+ struct uwb_rsv *rsv;
+
+ list_for_each_entry(rsv, &rc->reservations, rc_node) {
+ uwb_drp_handle_conflict_rsv(rc, rsv, drp_evt, drp_ie,
+ conflicting_mas);
+ }
+}
+
+static void uwb_drp_process_target_accepted(struct uwb_rc *rc,
+ struct uwb_rsv *rsv, struct uwb_rc_evt_drp *drp_evt,
+ struct uwb_ie_drp *drp_ie, struct uwb_mas_bm *mas)
+{
+ struct uwb_rsv_move *mv = &rsv->mv;
+ int status;
+
+ status = uwb_ie_drp_status(drp_ie);
+
+ if (rsv->state == UWB_RSV_STATE_T_CONFLICT) {
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_CONFLICT);
+ return;
+ }
+
+ if (rsv->state == UWB_RSV_STATE_T_EXPANDING_ACCEPTED) {
+ /* drp_ie is companion */
+ if (!bitmap_equal(rsv->mas.bm, mas->bm, UWB_NUM_MAS)) {
+ /* stroke companion */
+ uwb_rsv_set_state(rsv,
+ UWB_RSV_STATE_T_EXPANDING_ACCEPTED);
+ }
+ } else {
+ if (!bitmap_equal(rsv->mas.bm, mas->bm, UWB_NUM_MAS)) {
+ if (uwb_drp_avail_reserve_pending(rc, mas) == -EBUSY) {
+ /* FIXME: there is a conflict, find
+ * the conflicting reservations and
+ * take a sensible action. Consider
+ * that in drp_ie there is the
+ * "neighbour" */
+ uwb_drp_handle_all_conflict_rsv(rc, drp_evt,
+ drp_ie, mas);
+ } else {
+ /* accept the extra reservation */
+ bitmap_copy(mv->companion_mas.bm, mas->bm,
+ UWB_NUM_MAS);
+ uwb_rsv_set_state(rsv,
+ UWB_RSV_STATE_T_EXPANDING_ACCEPTED);
+ }
+ } else {
+ if (status) {
+ uwb_rsv_set_state(rsv,
+ UWB_RSV_STATE_T_ACCEPTED);
+ }
+ }
+
+ }
+}
+
+/*
+ * Based on the DRP IE, transition a target reservation to a new
+ * state.
+ */
+static void uwb_drp_process_target(struct uwb_rc *rc, struct uwb_rsv *rsv,
+ struct uwb_ie_drp *drp_ie, struct uwb_rc_evt_drp *drp_evt)
+{
+ struct device *dev = &rc->uwb_dev.dev;
+ struct uwb_rsv_move *mv = &rsv->mv;
+ int status;
+ enum uwb_drp_reason reason_code;
+ struct uwb_mas_bm mas;
+
+ status = uwb_ie_drp_status(drp_ie);
+ reason_code = uwb_ie_drp_reason_code(drp_ie);
+ uwb_drp_ie_to_bm(&mas, drp_ie);
+
+ switch (reason_code) {
+ case UWB_DRP_REASON_ACCEPTED:
+ uwb_drp_process_target_accepted(rc, rsv, drp_evt, drp_ie, &mas);
+ break;
+
+ case UWB_DRP_REASON_MODIFIED:
+ /* check to see if we have already modified the reservation */
+ if (bitmap_equal(rsv->mas.bm, mas.bm, UWB_NUM_MAS)) {
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED);
+ break;
+ }
+
+ /* find if the owner wants to expand or reduce */
+ if (bitmap_subset(mas.bm, rsv->mas.bm, UWB_NUM_MAS)) {
+ /* owner is reducing */
+ bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, mas.bm,
+ UWB_NUM_MAS);
+ uwb_drp_avail_release(rsv->rc, &mv->companion_mas);
+ }
+
+ bitmap_copy(rsv->mas.bm, mas.bm, UWB_NUM_MAS);
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_RESIZED);
+ break;
+ default:
+ dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n",
+ reason_code, status);
+ }
+}
+
+static void uwb_drp_process_owner_accepted(struct uwb_rsv *rsv,
+ struct uwb_mas_bm *mas)
+{
+ struct uwb_rsv_move *mv = &rsv->mv;
+
+ switch (rsv->state) {
+ case UWB_RSV_STATE_O_PENDING:
+ case UWB_RSV_STATE_O_INITIATED:
+ case UWB_RSV_STATE_O_ESTABLISHED:
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
+ break;
+ case UWB_RSV_STATE_O_MODIFIED:
+ if (bitmap_equal(mas->bm, rsv->mas.bm, UWB_NUM_MAS))
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
+ else
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MODIFIED);
+ break;
+
+ case UWB_RSV_STATE_O_MOVE_REDUCING: /* shouldn' t be a problem */
+ if (bitmap_equal(mas->bm, rsv->mas.bm, UWB_NUM_MAS))
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
+ else
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING);
+ break;
+ case UWB_RSV_STATE_O_MOVE_EXPANDING:
+ if (bitmap_equal(mas->bm, mv->companion_mas.bm, UWB_NUM_MAS)) {
+ /* Companion reservation accepted */
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING);
+ } else {
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING);
+ }
+ break;
+ case UWB_RSV_STATE_O_MOVE_COMBINING:
+ if (bitmap_equal(mas->bm, rsv->mas.bm, UWB_NUM_MAS))
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING);
+ else
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING);
+ break;
+ default:
+ break;
+ }
+}
+/*
+ * Based on the DRP IE, transition an owner reservation to a new
+ * state.
+ */
+static void uwb_drp_process_owner(struct uwb_rc *rc, struct uwb_rsv *rsv,
+ struct uwb_dev *src, struct uwb_ie_drp *drp_ie,
+ struct uwb_rc_evt_drp *drp_evt)
+{
+ struct device *dev = &rc->uwb_dev.dev;
+ int status;
+ enum uwb_drp_reason reason_code;
+ struct uwb_mas_bm mas;
+
+ status = uwb_ie_drp_status(drp_ie);
+ reason_code = uwb_ie_drp_reason_code(drp_ie);
+ uwb_drp_ie_to_bm(&mas, drp_ie);
+
+ if (status) {
+ switch (reason_code) {
+ case UWB_DRP_REASON_ACCEPTED:
+ uwb_drp_process_owner_accepted(rsv, &mas);
+ break;
+ default:
+ dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n",
+ reason_code, status);
+ }
+ } else {
+ switch (reason_code) {
+ case UWB_DRP_REASON_PENDING:
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_PENDING);
+ break;
+ case UWB_DRP_REASON_DENIED:
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
+ break;
+ case UWB_DRP_REASON_CONFLICT:
+ /* resolve the conflict */
+ bitmap_complement(mas.bm, src->last_availability_bm,
+ UWB_NUM_MAS);
+ uwb_drp_handle_conflict_rsv(rc, rsv, drp_evt, drp_ie, &mas);
+ break;
+ default:
+ dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n",
+ reason_code, status);
+ }
+ }
+}
+
+static void uwb_cnflt_alien_stroke_timer(struct uwb_cnflt_alien *cnflt)
+{
+ unsigned timeout_us = UWB_MAX_LOST_BEACONS * UWB_SUPERFRAME_LENGTH_US;
+ mod_timer(&cnflt->timer, jiffies + usecs_to_jiffies(timeout_us));
+}
+
+static void uwb_cnflt_update_work(struct work_struct *work)
+{
+ struct uwb_cnflt_alien *cnflt = container_of(work,
+ struct uwb_cnflt_alien,
+ cnflt_update_work);
+ struct uwb_cnflt_alien *c;
+ struct uwb_rc *rc = cnflt->rc;
+
+ unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE;
+
+ mutex_lock(&rc->rsvs_mutex);
+
+ list_del(&cnflt->rc_node);
+
+ /* update rc global conflicting alien bitmap */
+ bitmap_zero(rc->cnflt_alien_bitmap.bm, UWB_NUM_MAS);
+
+ list_for_each_entry(c, &rc->cnflt_alien_list, rc_node) {
+ bitmap_or(rc->cnflt_alien_bitmap.bm, rc->cnflt_alien_bitmap.bm,
+ c->mas.bm, UWB_NUM_MAS);
+ }
+
+ queue_delayed_work(rc->rsv_workq, &rc->rsv_alien_bp_work,
+ usecs_to_jiffies(delay_us));
+
+ kfree(cnflt);
+ mutex_unlock(&rc->rsvs_mutex);
+}
+
+static void uwb_cnflt_timer(unsigned long arg)
+{
+ struct uwb_cnflt_alien *cnflt = (struct uwb_cnflt_alien *)arg;
+
+ queue_work(cnflt->rc->rsv_workq, &cnflt->cnflt_update_work);
+}
+
+/*
+ * We have received an DRP_IE of type Alien BP and we need to make
+ * sure we do not transmit in conflicting MASs.
+ */
+static void uwb_drp_handle_alien_drp(struct uwb_rc *rc, struct uwb_ie_drp *drp_ie)
+{
+ struct device *dev = &rc->uwb_dev.dev;
+ struct uwb_mas_bm mas;
+ struct uwb_cnflt_alien *cnflt;
+ unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE;
+
+ uwb_drp_ie_to_bm(&mas, drp_ie);
+
+ list_for_each_entry(cnflt, &rc->cnflt_alien_list, rc_node) {
+ if (bitmap_equal(cnflt->mas.bm, mas.bm, UWB_NUM_MAS)) {
+ /* Existing alien BP reservation conflicting
+ * bitmap, just reset the timer */
+ uwb_cnflt_alien_stroke_timer(cnflt);
+ return;
+ }
+ }
+
+ /* New alien BP reservation conflicting bitmap */
+
+ /* alloc and initialize new uwb_cnflt_alien */
+ cnflt = kzalloc(sizeof(struct uwb_cnflt_alien), GFP_KERNEL);
+ if (!cnflt) {
+ dev_err(dev, "failed to alloc uwb_cnflt_alien struct\n");
+ return;
+ }
+
+ INIT_LIST_HEAD(&cnflt->rc_node);
+ init_timer(&cnflt->timer);
+ cnflt->timer.function = uwb_cnflt_timer;
+ cnflt->timer.data = (unsigned long)cnflt;
+
+ cnflt->rc = rc;
+ INIT_WORK(&cnflt->cnflt_update_work, uwb_cnflt_update_work);
+
+ bitmap_copy(cnflt->mas.bm, mas.bm, UWB_NUM_MAS);
+
+ list_add_tail(&cnflt->rc_node, &rc->cnflt_alien_list);
+
+ /* update rc global conflicting alien bitmap */
+ bitmap_or(rc->cnflt_alien_bitmap.bm, rc->cnflt_alien_bitmap.bm, mas.bm, UWB_NUM_MAS);
+
+ queue_delayed_work(rc->rsv_workq, &rc->rsv_alien_bp_work, usecs_to_jiffies(delay_us));
+
+ /* start the timer */
+ uwb_cnflt_alien_stroke_timer(cnflt);
+}
+
+static void uwb_drp_process_not_involved(struct uwb_rc *rc,
+ struct uwb_rc_evt_drp *drp_evt,
+ struct uwb_ie_drp *drp_ie)
+{
+ struct uwb_mas_bm mas;
+
+ uwb_drp_ie_to_bm(&mas, drp_ie);
+ uwb_drp_handle_all_conflict_rsv(rc, drp_evt, drp_ie, &mas);
+}
+
+static void uwb_drp_process_involved(struct uwb_rc *rc, struct uwb_dev *src,
+ struct uwb_rc_evt_drp *drp_evt,
+ struct uwb_ie_drp *drp_ie)
+{
+ struct uwb_rsv *rsv;
+
+ rsv = uwb_rsv_find(rc, src, drp_ie);
+ if (!rsv) {
+ /*
+ * No reservation? It's either for a recently
+ * terminated reservation; or the DRP IE couldn't be
+ * processed (e.g., an invalid IE or out of memory).
+ */
+ return;
+ }
+
+ /*
+ * Do nothing with DRP IEs for reservations that have been
+ * terminated.
+ */
+ if (rsv->state == UWB_RSV_STATE_NONE) {
+ uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
+ return;
+ }
+
+ if (uwb_ie_drp_owner(drp_ie))
+ uwb_drp_process_target(rc, rsv, drp_ie, drp_evt);
+ else
+ uwb_drp_process_owner(rc, rsv, src, drp_ie, drp_evt);
+
+}
+
+
+static bool uwb_drp_involves_us(struct uwb_rc *rc, struct uwb_ie_drp *drp_ie)
+{
+ return uwb_dev_addr_cmp(&rc->uwb_dev.dev_addr, &drp_ie->dev_addr) == 0;
+}
+
+/*
+ * Process a received DRP IE.
+ */
+static void uwb_drp_process(struct uwb_rc *rc, struct uwb_rc_evt_drp *drp_evt,
+ struct uwb_dev *src, struct uwb_ie_drp *drp_ie)
+{
+ if (uwb_ie_drp_type(drp_ie) == UWB_DRP_TYPE_ALIEN_BP)
+ uwb_drp_handle_alien_drp(rc, drp_ie);
+ else if (uwb_drp_involves_us(rc, drp_ie))
+ uwb_drp_process_involved(rc, src, drp_evt, drp_ie);
+ else
+ uwb_drp_process_not_involved(rc, drp_evt, drp_ie);
+}
+
+/*
+ * Process a received DRP Availability IE
+ */
+static void uwb_drp_availability_process(struct uwb_rc *rc, struct uwb_dev *src,
+ struct uwb_ie_drp_avail *drp_availability_ie)
+{
+ bitmap_copy(src->last_availability_bm,
+ drp_availability_ie->bmp, UWB_NUM_MAS);
+}
+
+/*
+ * Process all the DRP IEs (both DRP IEs and the DRP Availability IE)
+ * from a device.
+ */
+static
+void uwb_drp_process_all(struct uwb_rc *rc, struct uwb_rc_evt_drp *drp_evt,
+ size_t ielen, struct uwb_dev *src_dev)
+{
+ struct device *dev = &rc->uwb_dev.dev;
+ struct uwb_ie_hdr *ie_hdr;
+ void *ptr;
+
+ ptr = drp_evt->ie_data;
+ for (;;) {
+ ie_hdr = uwb_ie_next(&ptr, &ielen);
+ if (!ie_hdr)
+ break;
+
+ switch (ie_hdr->element_id) {
+ case UWB_IE_DRP_AVAILABILITY:
+ uwb_drp_availability_process(rc, src_dev, (struct uwb_ie_drp_avail *)ie_hdr);
+ break;
+ case UWB_IE_DRP:
+ uwb_drp_process(rc, drp_evt, src_dev, (struct uwb_ie_drp *)ie_hdr);
+ break;
+ default:
+ dev_warn(dev, "unexpected IE in DRP notification\n");
+ break;
+ }
+ }
+
+ if (ielen > 0)
+ dev_warn(dev, "%d octets remaining in DRP notification\n",
+ (int)ielen);
+}
+
+/**
+ * uwbd_evt_handle_rc_drp - handle a DRP_IE event
+ * @evt: the DRP_IE event from the radio controller
+ *
+ * This processes DRP notifications from the radio controller, either
+ * initiating a new reservation or transitioning an existing
+ * reservation into a different state.
+ *
+ * DRP notifications can occur for three different reasons:
+ *
+ * - UWB_DRP_NOTIF_DRP_IE_RECVD: one or more DRP IEs with the RC as
+ * the target or source have been received.
+ *
+ * These DRP IEs could be new or for an existing reservation.
+ *
+ * If the DRP IE for an existing reservation ceases to be to
+ * received for at least mMaxLostBeacons, the reservation should be
+ * considered to be terminated. Note that the TERMINATE reason (see
+ * below) may not always be signalled (e.g., the remote device has
+ * two or more reservations established with the RC).
+ *
+ * - UWB_DRP_NOTIF_CONFLICT: DRP IEs from any device in the beacon
+ * group conflict with the RC's reservations.
+ *
+ * - UWB_DRP_NOTIF_TERMINATE: DRP IEs are no longer being received
+ * from a device (i.e., it's terminated all reservations).
+ *
+ * Only the software state of the reservations is changed; the setting
+ * of the radio controller's DRP IEs is done after all the events in
+ * an event buffer are processed. This saves waiting multiple times
+ * for the SET_DRP_IE command to complete.
+ */
+int uwbd_evt_handle_rc_drp(struct uwb_event *evt)
+{
+ struct device *dev = &evt->rc->uwb_dev.dev;
+ struct uwb_rc *rc = evt->rc;
+ struct uwb_rc_evt_drp *drp_evt;
+ size_t ielength, bytes_left;
+ struct uwb_dev_addr src_addr;
+ struct uwb_dev *src_dev;
+
+ /* Is there enough data to decode the event (and any IEs in
+ its payload)? */
+ if (evt->notif.size < sizeof(*drp_evt)) {
+ dev_err(dev, "DRP event: Not enough data to decode event "
+ "[%zu bytes left, %zu needed]\n",
+ evt->notif.size, sizeof(*drp_evt));
+ return 0;
+ }
+ bytes_left = evt->notif.size - sizeof(*drp_evt);
+ drp_evt = container_of(evt->notif.rceb, struct uwb_rc_evt_drp, rceb);
+ ielength = le16_to_cpu(drp_evt->ie_length);
+ if (bytes_left != ielength) {
+ dev_err(dev, "DRP event: Not enough data in payload [%zu"
+ "bytes left, %zu declared in the event]\n",
+ bytes_left, ielength);
+ return 0;
+ }
+
+ memcpy(src_addr.data, &drp_evt->src_addr, sizeof(src_addr));
+ src_dev = uwb_dev_get_by_devaddr(rc, &src_addr);
+ if (!src_dev) {
+ /*
+ * A DRP notification from an unrecognized device.
+ *
+ * This is probably from a WUSB device that doesn't
+ * have an EUI-48 and therefore doesn't show up in the
+ * UWB device database. It's safe to simply ignore
+ * these.
+ */
+ return 0;
+ }
+
+ mutex_lock(&rc->rsvs_mutex);
+
+ /* We do not distinguish from the reason */
+ uwb_drp_process_all(rc, drp_evt, ielength, src_dev);
+
+ mutex_unlock(&rc->rsvs_mutex);
+
+ uwb_dev_put(src_dev);
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff