From 6fae35f9cea92793a98b2d9ab21235e5ae035581 Mon Sep 17 00:00:00 2001 From: David Vrabel Date: Mon, 17 Nov 2008 15:53:42 +0000 Subject: uwb: add basic radio manager The UWB radio manager coordinates the use of the radio between the PALs that may be using it. PALs request use of the radio with uwb_radio_start() and the radio manager will start beaconing if its not already doing so. When the last PAL has called uwb_radio_stop() beaconing will be stopped. In the future, the radio manager will have a more sophisticated channel selection algorithm, probably following the Channel Selection Policy from the WiMedia Alliance when it is finalized. For now, channel 9 (BG1, TFC1) is selected. The user may override the channel selected by the radio manager and may force the radio to stop beaconing. The WUSB Host Controller PAL makes use of this and there are two new debug PAL commands that can be used for testing. Signed-off-by: David Vrabel --- drivers/uwb/drp.c | 24 ++---------------------- 1 file changed, 2 insertions(+), 22 deletions(-) (limited to 'drivers/uwb/drp.c') diff --git a/drivers/uwb/drp.c b/drivers/uwb/drp.c index c0b1e5e2bd08..fe328146adb7 100644 --- a/drivers/uwb/drp.c +++ b/drivers/uwb/drp.c @@ -37,14 +37,13 @@ * * A DRP Availability IE is appended. * - * rc->uwb_dev.mutex is held + * 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. */ -static -int uwb_rc_gen_send_drp_ie(struct uwb_rc *rc) +int uwb_rc_send_all_drp_ie(struct uwb_rc *rc) { int result; struct device *dev = &rc->uwb_dev.dev; @@ -102,25 +101,6 @@ error_cmd: kfree(cmd); error: return result; - -} -/** - * Send all DRP IEs associated with this host - * - * @returns: >= 0 number of bytes still available in the beacon - * < 0 errno code on error. - * - * As per the protocol we obtain the host controller device lock to access - * bandwidth structures. - */ -int uwb_rc_send_all_drp_ie(struct uwb_rc *rc) -{ - int result; - - mutex_lock(&rc->uwb_dev.mutex); - result = uwb_rc_gen_send_drp_ie(rc); - mutex_unlock(&rc->uwb_dev.mutex); - return result; } void uwb_drp_handle_timeout(struct uwb_rsv *rsv) -- cgit v1.2.2 From 5b37717a23b8e40f6cf7ad85a26ddcf41c171e2c Mon Sep 17 00:00:00 2001 From: Stefano Panella Date: Fri, 12 Dec 2008 13:00:06 +0000 Subject: uwb: improved MAS allocator and reservation conflict handling Greatly enhance the MAS allocator: - Handle row and column reservations. - Permit all the available MAS to be allocated. - Follows the WiMedia rules on MAS selection. Take appropriate action when reservation conflicts are detected. - Correctly identify which reservation wins the conflict. - Protect alien BP reservations. - If an owned reservation loses, resize/move it. - Follow the backoff procedure before requesting additional MAS. When reservations are terminated, move the remaining reservations (if necessary) so they keep following the MAS allocation rules. Signed-off-by: Stefano Panella Signed-off-by: David Vrabel --- drivers/uwb/drp.c | 681 ++++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 527 insertions(+), 154 deletions(-) (limited to 'drivers/uwb/drp.c') diff --git a/drivers/uwb/drp.c b/drivers/uwb/drp.c index fe328146adb7..2b4f9406789d 100644 --- a/drivers/uwb/drp.c +++ b/drivers/uwb/drp.c @@ -23,6 +23,59 @@ #include #include "uwb-internal.h" + +/* DRP Conflict Actions ([ECMA-368 2nd Edition] 17.4.6) */ +enum uwb_drp_conflict_action { + /* Reservation is mantained, 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; + + 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(&rc->rsvs_lock); + 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(&rc->rsvs_lock); +} + /** * Construct and send the SET DRP IE * @@ -46,18 +99,23 @@ int uwb_rc_send_all_drp_ie(struct uwb_rc *rc) { int result; - struct device *dev = &rc->uwb_dev.dev; struct uwb_rc_cmd_set_drp_ie *cmd; - struct uwb_rc_evt_set_drp_ie reply; 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) + 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); @@ -68,109 +126,322 @@ int uwb_rc_send_all_drp_ie(struct uwb_rc *rc) 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; + } } } - memcpy(IEDataptr, &rc->drp_avail.ie, sizeof(rc->drp_avail.ie)); - reply.rceb.bEventType = UWB_RC_CET_GENERAL; - reply.rceb.wEvent = UWB_RC_CMD_SET_DRP_IE; - result = uwb_rc_cmd(rc, "SET-DRP-IE", &cmd->rccb, - sizeof(*cmd) + num_bytes, &reply.rceb, - sizeof(reply)); - if (result < 0) - goto error_cmd; - result = le16_to_cpu(reply.wRemainingSpace); - if (reply.bResultCode != UWB_RC_RES_SUCCESS) { - dev_err(&rc->uwb_dev.dev, "SET-DRP-IE: command execution " - "failed: %s (%d). RemainingSpace in beacon " - "= %d\n", uwb_rc_strerror(reply.bResultCode), - reply.bResultCode, result); - result = -EIO; - } else { - dev_dbg(dev, "SET-DRP-IE sent. RemainingSpace in beacon " - "= %d.\n", result); - result = 0; - } -error_cmd: + 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; } -void uwb_drp_handle_timeout(struct uwb_rsv *rsv) +/* + * 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) { - struct device *dev = &rsv->rc->uwb_dev.dev; + 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; + } - dev_dbg(dev, "reservation timeout in state %s (%d)\n", - uwb_rsv_state_str(rsv->state), rsv->state); + /* [ECMA-368 2nd Edition] 17.4.6-4 */ + if (our_status == 1 && ext_status == 0) { + return UWB_DRP_CONFLICT_MANTAIN; + } - switch (rsv->state) { - case UWB_RSV_STATE_O_INITIATED: - if (rsv->is_multicast) { - uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); - return; + /* [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; + } } - break; - case UWB_RSV_STATE_O_ESTABLISHED: - if (rsv->is_multicast) - return; - break; - default: - break; + } 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); } - uwb_rsv_remove(rsv); } +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); + } +} + /* * 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_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); - if (status) { - switch (reason_code) { - case UWB_DRP_REASON_ACCEPTED: - uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED); - break; - case UWB_DRP_REASON_MODIFIED: - dev_err(dev, "FIXME: unhandled reason code (%d/%d)\n", - reason_code, status); + switch (reason_code) { + case UWB_DRP_REASON_ACCEPTED: + + if (rsv->state == UWB_RSV_STATE_T_CONFLICT) { + uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_CONFLICT); break; - default: - dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n", - reason_code, status); } - } else { - switch (reason_code) { - case UWB_DRP_REASON_ACCEPTED: - /* New reservations are handled in uwb_rsv_find(). */ - break; - case UWB_DRP_REASON_DENIED: - uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); - break; - case UWB_DRP_REASON_CONFLICT: - case UWB_DRP_REASON_MODIFIED: - dev_err(dev, "FIXME: unhandled reason code (%d/%d)\n", - reason_code, status); + + 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); + } + } + + } + 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; - default: - dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n", - reason_code, status); } + + /* 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); } } @@ -179,23 +450,60 @@ static void uwb_drp_process_target(struct uwb_rc *rc, struct uwb_rsv *rsv, * state. */ static void uwb_drp_process_owner(struct uwb_rc *rc, struct uwb_rsv *rsv, - struct uwb_ie_drp *drp_ie) + struct uwb_dev *src, 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); if (status) { switch (reason_code) { case UWB_DRP_REASON_ACCEPTED: - uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); - break; - case UWB_DRP_REASON_MODIFIED: - dev_err(dev, "FIXME: unhandled reason code (%d/%d)\n", - reason_code, status); + 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; + } break; default: dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n", @@ -210,9 +518,10 @@ static void uwb_drp_process_owner(struct uwb_rc *rc, struct uwb_rsv *rsv, uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); break; case UWB_DRP_REASON_CONFLICT: - case UWB_DRP_REASON_MODIFIED: - dev_err(dev, "FIXME: unhandled reason code (%d/%d)\n", - reason_code, status); + /* 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", @@ -221,12 +530,110 @@ static void uwb_drp_process_owner(struct uwb_rc *rc, struct uwb_rsv *rsv, } } +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); +} + /* - * Process a received DRP IE, it's either for a reservation owned by - * the RC or targeted at it (or it's for a WUSB cluster reservation). + * 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_process(struct uwb_rc *rc, struct uwb_dev *src, - struct uwb_ie_drp *drp_ie) +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; + char buf[72]; + unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE; + + uwb_drp_ie_to_bm(&mas, drp_ie); + bitmap_scnprintf(buf, sizeof(buf), mas.bm, UWB_NUM_MAS); + + 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"); + 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; @@ -239,7 +646,7 @@ static void uwb_drp_process(struct uwb_rc *rc, struct uwb_dev *src, */ return; } - + /* * Do nothing with DRP IEs for reservations that have been * terminated. @@ -248,13 +655,43 @@ static void uwb_drp_process(struct uwb_rc *rc, struct uwb_dev *src, 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); + 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_owner(rc, rsv, drp_ie); + 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) @@ -276,10 +713,10 @@ void uwb_drp_process_all(struct uwb_rc *rc, struct uwb_rc_evt_drp *drp_evt, switch (ie_hdr->element_id) { case UWB_IE_DRP_AVAILABILITY: - /* FIXME: does something need to be done with this? */ + uwb_drp_availability_process(rc, src_dev, (struct uwb_ie_drp_avail *)ie_hdr); break; case UWB_IE_DRP: - uwb_drp_process(rc, src_dev, (struct uwb_ie_drp *)ie_hdr); + 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"); @@ -292,55 +729,6 @@ void uwb_drp_process_all(struct uwb_rc *rc, struct uwb_rc_evt_drp *drp_evt, (int)ielen); } - -/* - * Go through all the DRP IEs and find the ones that conflict with our - * reservations. - * - * FIXME: must resolve the conflict according the the rules in - * [ECMA-368]. - */ -static -void uwb_drp_process_conflict_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; - struct uwb_ie_drp *drp_ie; - void *ptr; - - ptr = drp_evt->ie_data; - for (;;) { - ie_hdr = uwb_ie_next(&ptr, &ielen); - if (!ie_hdr) - break; - - drp_ie = container_of(ie_hdr, struct uwb_ie_drp, hdr); - - /* FIXME: check if this DRP IE conflicts. */ - } - - if (ielen > 0) - dev_warn(dev, "%d octets remaining in DRP notification\n", - (int)ielen); -} - - -/* - * Terminate all reservations owned by, or targeted at, 'uwb_dev'. - */ -static void uwb_drp_terminate_all(struct uwb_rc *rc, struct uwb_dev *uwb_dev) -{ - struct uwb_rsv *rsv; - - list_for_each_entry(rsv, &rc->reservations, rc_node) { - if (rsv->owner == uwb_dev - || (rsv->target.type == UWB_RSV_TARGET_DEV && rsv->target.dev == uwb_dev)) - uwb_rsv_remove(rsv); - } -} - - /** * uwbd_evt_handle_rc_drp - handle a DRP_IE event * @evt: the DRP_IE event from the radio controller @@ -381,7 +769,6 @@ int uwbd_evt_handle_rc_drp(struct uwb_event *evt) size_t ielength, bytes_left; struct uwb_dev_addr src_addr; struct uwb_dev *src_dev; - int reason; /* Is there enough data to decode the event (and any IEs in its payload)? */ @@ -417,22 +804,8 @@ int uwbd_evt_handle_rc_drp(struct uwb_event *evt) mutex_lock(&rc->rsvs_mutex); - reason = uwb_rc_evt_drp_reason(drp_evt); - - switch (reason) { - case UWB_DRP_NOTIF_DRP_IE_RCVD: - uwb_drp_process_all(rc, drp_evt, ielength, src_dev); - break; - case UWB_DRP_NOTIF_CONFLICT: - uwb_drp_process_conflict_all(rc, drp_evt, ielength, src_dev); - break; - case UWB_DRP_NOTIF_TERMINATE: - uwb_drp_terminate_all(rc, src_dev); - break; - default: - dev_warn(dev, "ignored DRP event with reason code: %d\n", reason); - break; - } + /* We do not distinguish from the reason */ + uwb_drp_process_all(rc, drp_evt, ielength, src_dev); mutex_unlock(&rc->rsvs_mutex); -- cgit v1.2.2