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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 <stefano.panella@csr.com>
Signed-off-by: David Vrabel <david.vrabel@csr.com>
wifi-calibration
Stefano Panella 2008-12-12 13:00:06 +00:00 committed by David Vrabel
parent c35fa3ea1a
commit 5b37717a23
12 changed files with 1605 additions and 329 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/usb/wusbcore/reservation.c
View File

@ -48,13 +48,15 @@ static void wusbhc_rsv_complete_cb(struct uwb_rsv *rsv)
{
struct wusbhc *wusbhc = rsv->pal_priv;
struct device *dev = wusbhc->dev;
struct uwb_mas_bm mas;
char buf[72];
switch (rsv->state) {
case UWB_RSV_STATE_O_ESTABLISHED:
bitmap_scnprintf(buf, sizeof(buf), rsv->mas.bm, UWB_NUM_MAS);
uwb_rsv_get_usable_mas(rsv, &mas);
bitmap_scnprintf(buf, sizeof(buf), mas.bm, UWB_NUM_MAS);
dev_dbg(dev, "established reservation: %s\n", buf);
wusbhc_bwa_set(wusbhc, rsv->stream, &rsv->mas);
wusbhc_bwa_set(wusbhc, rsv->stream, &mas);
break;
case UWB_RSV_STATE_NONE:
dev_dbg(dev, "removed reservation\n");
@ -85,13 +87,12 @@ int wusbhc_rsv_establish(struct wusbhc *wusbhc)
bcid.data[0] = wusbhc->cluster_id;
bcid.data[1] = 0;
rsv->owner = &rc->uwb_dev;
rsv->target.type = UWB_RSV_TARGET_DEVADDR;
rsv->target.devaddr = bcid;
rsv->type = UWB_DRP_TYPE_PRIVATE;
rsv->max_mas = 256;
rsv->min_mas = 16; /* one MAS per zone? */
rsv->sparsity = 16; /* at least one MAS in each zone? */
rsv->max_mas = 256; /* try to get as much as possible */
rsv->min_mas = 15; /* one MAS per zone */
rsv->max_interval = 1; /* max latency is one zone */
rsv->is_multicast = true;
ret = uwb_rsv_establish(rsv);

1
drivers/uwb/Makefile
View File

@ -6,6 +6,7 @@ obj-$(CONFIG_UWB_I1480U) += i1480/
uwb-objs := \
address.o \
allocator.o \
beacon.o \
driver.o \
drp.o \

386
drivers/uwb/allocator.c 100644
View File

@ -0,0 +1,386 @@
/*
* UWB reservation management.
*
* 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/version.h>
#include <linux/kernel.h>
#include <linux/uwb.h>
#include "uwb-internal.h"
static void uwb_rsv_fill_column_alloc(struct uwb_rsv_alloc_info *ai)
{
int col, mas, safe_mas, unsafe_mas;
unsigned char *bm = ai->bm;
struct uwb_rsv_col_info *ci = ai->ci;
unsigned char c;
for (col = ci->csi.start_col; col < UWB_NUM_ZONES; col += ci->csi.interval) {
safe_mas = ci->csi.safe_mas_per_col;
unsafe_mas = ci->csi.unsafe_mas_per_col;
for (mas = 0; mas < UWB_MAS_PER_ZONE; mas++ ) {
if (bm[col * UWB_MAS_PER_ZONE + mas] == 0) {
if (safe_mas > 0) {
safe_mas--;
c = UWB_RSV_MAS_SAFE;
} else if (unsafe_mas > 0) {
unsafe_mas--;
c = UWB_RSV_MAS_UNSAFE;
} else {
break;
}
bm[col * UWB_MAS_PER_ZONE + mas] = c;
}
}
}
}
static void uwb_rsv_fill_row_alloc(struct uwb_rsv_alloc_info *ai)
{
int mas, col, rows;
unsigned char *bm = ai->bm;
struct uwb_rsv_row_info *ri = &ai->ri;
unsigned char c;
rows = 1;
c = UWB_RSV_MAS_SAFE;
for (mas = UWB_MAS_PER_ZONE - 1; mas >= 0; mas--) {
if (ri->avail[mas] == 1) {
if (rows > ri->used_rows) {
break;
} else if (rows > 7) {
c = UWB_RSV_MAS_UNSAFE;
}
for (col = 0; col < UWB_NUM_ZONES; col++) {
if (bm[col * UWB_NUM_ZONES + mas] != UWB_RSV_MAS_NOT_AVAIL) {
bm[col * UWB_NUM_ZONES + mas] = c;
if(c == UWB_RSV_MAS_SAFE)
ai->safe_allocated_mases++;
else
ai->unsafe_allocated_mases++;
}
}
rows++;
}
}
ai->total_allocated_mases = ai->safe_allocated_mases + ai->unsafe_allocated_mases;
}
/*
* Find the best column set for a given availability, interval, num safe mas and
* num unsafe mas.
*
* The different sets are tried in order as shown below, depending on the interval.
*
* interval = 16
* deep = 0
* set 1 -> { 8 }
* deep = 1
* set 1 -> { 4 }
* set 2 -> { 12 }
* deep = 2
* set 1 -> { 2 }
* set 2 -> { 6 }
* set 3 -> { 10 }
* set 4 -> { 14 }
* deep = 3
* set 1 -> { 1 }
* set 2 -> { 3 }
* set 3 -> { 5 }
* set 4 -> { 7 }
* set 5 -> { 9 }
* set 6 -> { 11 }
* set 7 -> { 13 }
* set 8 -> { 15 }
*
* interval = 8
* deep = 0
* set 1 -> { 4 12 }
* deep = 1
* set 1 -> { 2 10 }
* set 2 -> { 6 14 }
* deep = 2
* set 1 -> { 1 9 }
* set 2 -> { 3 11 }
* set 3 -> { 5 13 }
* set 4 -> { 7 15 }
*
* interval = 4
* deep = 0
* set 1 -> { 2 6 10 14 }
* deep = 1
* set 1 -> { 1 5 9 13 }
* set 2 -> { 3 7 11 15 }
*
* interval = 2
* deep = 0
* set 1 -> { 1 3 5 7 9 11 13 15 }
*/
static int uwb_rsv_find_best_column_set(struct uwb_rsv_alloc_info *ai, int interval,
int num_safe_mas, int num_unsafe_mas)
{
struct uwb_rsv_col_info *ci = ai->ci;
struct uwb_rsv_col_set_info *csi = &ci->csi;
struct uwb_rsv_col_set_info tmp_csi;
int deep, set, col, start_col_deep, col_start_set;
int start_col, max_mas_in_set, lowest_max_mas_in_deep;
int n_mas;
int found = UWB_RSV_ALLOC_NOT_FOUND;
tmp_csi.start_col = 0;
start_col_deep = interval;
n_mas = num_unsafe_mas + num_safe_mas;
for (deep = 0; ((interval >> deep) & 0x1) == 0; deep++) {
start_col_deep /= 2;
col_start_set = 0;
lowest_max_mas_in_deep = UWB_MAS_PER_ZONE;
for (set = 1; set <= (1 << deep); set++) {
max_mas_in_set = 0;
start_col = start_col_deep + col_start_set;
for (col = start_col; col < UWB_NUM_ZONES; col += interval) {
if (ci[col].max_avail_safe >= num_safe_mas &&
ci[col].max_avail_unsafe >= n_mas) {
if (ci[col].highest_mas[n_mas] > max_mas_in_set)
max_mas_in_set = ci[col].highest_mas[n_mas];
} else {
max_mas_in_set = 0;
break;
}
}
if ((lowest_max_mas_in_deep > max_mas_in_set) && max_mas_in_set) {
lowest_max_mas_in_deep = max_mas_in_set;
tmp_csi.start_col = start_col;
}
col_start_set += (interval >> deep);
}
if (lowest_max_mas_in_deep < 8) {
csi->start_col = tmp_csi.start_col;
found = UWB_RSV_ALLOC_FOUND;
break;
} else if ((lowest_max_mas_in_deep > 8) &&
(lowest_max_mas_in_deep != UWB_MAS_PER_ZONE) &&
(found == UWB_RSV_ALLOC_NOT_FOUND)) {
csi->start_col = tmp_csi.start_col;
found = UWB_RSV_ALLOC_FOUND;
}
}
if (found == UWB_RSV_ALLOC_FOUND) {
csi->interval = interval;
csi->safe_mas_per_col = num_safe_mas;
csi->unsafe_mas_per_col = num_unsafe_mas;
ai->safe_allocated_mases = (UWB_NUM_ZONES / interval) * num_safe_mas;
ai->unsafe_allocated_mases = (UWB_NUM_ZONES / interval) * num_unsafe_mas;
ai->total_allocated_mases = ai->safe_allocated_mases + ai->unsafe_allocated_mases;
ai->interval = interval;
}
return found;
}
static void get_row_descriptors(struct uwb_rsv_alloc_info *ai)
{
unsigned char *bm = ai->bm;
struct uwb_rsv_row_info *ri = &ai->ri;
int col, mas;
ri->free_rows = 16;
for (mas = 0; mas < UWB_MAS_PER_ZONE; mas ++) {
ri->avail[mas] = 1;
for (col = 1; col < UWB_NUM_ZONES; col++) {
if (bm[col * UWB_NUM_ZONES + mas] == UWB_RSV_MAS_NOT_AVAIL) {
ri->free_rows--;
ri->avail[mas]=0;
break;
}
}
}
}
static void uwb_rsv_fill_column_info(unsigned char *bm, int column, struct uwb_rsv_col_info *rci)
{
int mas;
int block_count = 0, start_block = 0;
int previous_avail = 0;
int available = 0;
int safe_mas_in_row[UWB_MAS_PER_ZONE] = {
8, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1,
};
rci->max_avail_safe = 0;
for (mas = 0; mas < UWB_MAS_PER_ZONE; mas ++) {
if (!bm[column * UWB_NUM_ZONES + mas]) {
available++;
rci->max_avail_unsafe = available;
rci->highest_mas[available] = mas;
if (previous_avail) {
block_count++;
if ((block_count > safe_mas_in_row[start_block]) &&
(!rci->max_avail_safe))
rci->max_avail_safe = available - 1;
} else {
previous_avail = 1;
start_block = mas;
block_count = 1;
}
} else {
previous_avail = 0;
}
}
if (!rci->max_avail_safe)
rci->max_avail_safe = rci->max_avail_unsafe;
}
static void get_column_descriptors(struct uwb_rsv_alloc_info *ai)
{
unsigned char *bm = ai->bm;
struct uwb_rsv_col_info *ci = ai->ci;
int col;
for (col = 1; col < UWB_NUM_ZONES; col++) {
uwb_rsv_fill_column_info(bm, col, &ci[col]);
}
}
static int uwb_rsv_find_best_row_alloc(struct uwb_rsv_alloc_info *ai)
{
int n_rows;
int max_rows = ai->max_mas / UWB_USABLE_MAS_PER_ROW;
int min_rows = ai->min_mas / UWB_USABLE_MAS_PER_ROW;
if (ai->min_mas % UWB_USABLE_MAS_PER_ROW)
min_rows++;
for (n_rows = max_rows; n_rows >= min_rows; n_rows--) {
if (n_rows <= ai->ri.free_rows) {
ai->ri.used_rows = n_rows;
ai->interval = 1; /* row reservation */
uwb_rsv_fill_row_alloc(ai);
return UWB_RSV_ALLOC_FOUND;
}
}
return UWB_RSV_ALLOC_NOT_FOUND;
}
static int uwb_rsv_find_best_col_alloc(struct uwb_rsv_alloc_info *ai, int interval)
{
int n_safe, n_unsafe, n_mas;
int n_column = UWB_NUM_ZONES / interval;
int max_per_zone = ai->max_mas / n_column;
int min_per_zone = ai->min_mas / n_column;
if (ai->min_mas % n_column)
min_per_zone++;
if (min_per_zone > UWB_MAS_PER_ZONE) {
return UWB_RSV_ALLOC_NOT_FOUND;
}
if (max_per_zone > UWB_MAS_PER_ZONE) {
max_per_zone = UWB_MAS_PER_ZONE;
}
for (n_mas = max_per_zone; n_mas >= min_per_zone; n_mas--) {
if (uwb_rsv_find_best_column_set(ai, interval, 0, n_mas) == UWB_RSV_ALLOC_NOT_FOUND)
continue;
for (n_safe = n_mas; n_safe >= 0; n_safe--) {
n_unsafe = n_mas - n_safe;
if (uwb_rsv_find_best_column_set(ai, interval, n_safe, n_unsafe) == UWB_RSV_ALLOC_FOUND) {
uwb_rsv_fill_column_alloc(ai);
return UWB_RSV_ALLOC_FOUND;
}
}
}
return UWB_RSV_ALLOC_NOT_FOUND;
}
int uwb_rsv_find_best_allocation(struct uwb_rsv *rsv, struct uwb_mas_bm *available,
struct uwb_mas_bm *result)
{
struct uwb_rsv_alloc_info *ai;
int interval;
int bit_index;
ai = kzalloc(sizeof(struct uwb_rsv_alloc_info), GFP_KERNEL);
ai->min_mas = rsv->min_mas;
ai->max_mas = rsv->max_mas;
ai->max_interval = rsv->max_interval;
/* fill the not available vector from the available bm */
for (bit_index = 0; bit_index < UWB_NUM_MAS; bit_index++) {
if (!test_bit(bit_index, available->bm))
ai->bm[bit_index] = UWB_RSV_MAS_NOT_AVAIL;
}
if (ai->max_interval == 1) {
get_row_descriptors(ai);
if (uwb_rsv_find_best_row_alloc(ai) == UWB_RSV_ALLOC_FOUND)
goto alloc_found;
else
goto alloc_not_found;
}
get_column_descriptors(ai);
for (interval = 16; interval >= 2; interval>>=1) {
if (interval > ai->max_interval)
continue;
if (uwb_rsv_find_best_col_alloc(ai, interval) == UWB_RSV_ALLOC_FOUND)
goto alloc_found;
}
/* try row reservation if no column is found */
get_row_descriptors(ai);
if (uwb_rsv_find_best_row_alloc(ai) == UWB_RSV_ALLOC_FOUND)
goto alloc_found;
else
goto alloc_not_found;
alloc_found:
bitmap_zero(result->bm, UWB_NUM_MAS);
bitmap_zero(result->unsafe_bm, UWB_NUM_MAS);
/* fill the safe and unsafe bitmaps */
for (bit_index = 0; bit_index < UWB_NUM_MAS; bit_index++) {
if (ai->bm[bit_index] == UWB_RSV_MAS_SAFE)
set_bit(bit_index, result->bm);
else if (ai->bm[bit_index] == UWB_RSV_MAS_UNSAFE)
set_bit(bit_index, result->unsafe_bm);
}
bitmap_or(result->bm, result->bm, result->unsafe_bm, UWB_NUM_MAS);
result->safe = ai->safe_allocated_mases;
result->unsafe = ai->unsafe_allocated_mases;
kfree(ai);
return UWB_RSV_ALLOC_FOUND;
alloc_not_found:
kfree(ai);
return UWB_RSV_ALLOC_NOT_FOUND;
}

4
drivers/uwb/drp-avail.c
View File

@ -58,7 +58,7 @@ void uwb_drp_avail_init(struct uwb_rc *rc)
*
* avail = global & local & pending
*/
static void uwb_drp_available(struct uwb_rc *rc, struct uwb_mas_bm *avail)
void uwb_drp_available(struct uwb_rc *rc, struct uwb_mas_bm *avail)
{
bitmap_and(avail->bm, rc->drp_avail.global, rc->drp_avail.local, UWB_NUM_MAS);
bitmap_and(avail->bm, avail->bm, rc->drp_avail.pending, UWB_NUM_MAS);
@ -105,6 +105,7 @@ void uwb_drp_avail_release(struct uwb_rc *rc, struct uwb_mas_bm *mas)
bitmap_or(rc->drp_avail.local, rc->drp_avail.local, mas->bm, UWB_NUM_MAS);
bitmap_or(rc->drp_avail.pending, rc->drp_avail.pending, mas->bm, UWB_NUM_MAS);
rc->drp_avail.ie_valid = false;
uwb_rsv_handle_drp_avail_change(rc);
}
/**
@ -280,6 +281,7 @@ int uwbd_evt_handle_rc_drp_avail(struct uwb_event *evt)
mutex_lock(&rc->rsvs_mutex);
bitmap_copy(rc->drp_avail.global, bmp, UWB_NUM_MAS);
rc->drp_avail.ie_valid = false;
uwb_rsv_handle_drp_avail_change(rc);
mutex_unlock(&rc->rsvs_mutex);
uwb_rsv_sched_update(rc);

160
drivers/uwb/drp-ie.c
View File

@ -22,6 +22,96 @@
#include "uwb-internal.h"
/*
* Return the reason code for a reservations's DRP IE.
*/
int uwb_rsv_reason_code(struct uwb_rsv *rsv)
{
static const int reason_codes[] = {
[UWB_RSV_STATE_O_INITIATED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_O_PENDING] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_O_MODIFIED] = UWB_DRP_REASON_MODIFIED,
[UWB_RSV_STATE_O_ESTABLISHED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_O_TO_BE_MOVED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_O_MOVE_COMBINING] = UWB_DRP_REASON_MODIFIED,
[UWB_RSV_STATE_O_MOVE_REDUCING] = UWB_DRP_REASON_MODIFIED,
[UWB_RSV_STATE_O_MOVE_EXPANDING] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_CONFLICT] = UWB_DRP_REASON_CONFLICT,
[UWB_RSV_STATE_T_PENDING] = UWB_DRP_REASON_PENDING,
[UWB_RSV_STATE_T_DENIED] = UWB_DRP_REASON_DENIED,
[UWB_RSV_STATE_T_RESIZED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = UWB_DRP_REASON_CONFLICT,
[UWB_RSV_STATE_T_EXPANDING_PENDING] = UWB_DRP_REASON_PENDING,
[UWB_RSV_STATE_T_EXPANDING_DENIED] = UWB_DRP_REASON_DENIED,
};
return reason_codes[rsv->state];
}
/*
* Return the reason code for a reservations's companion DRP IE .
*/
int uwb_rsv_companion_reason_code(struct uwb_rsv *rsv)
{
static const int companion_reason_codes[] = {
[UWB_RSV_STATE_O_MOVE_EXPANDING] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = UWB_DRP_REASON_CONFLICT,
[UWB_RSV_STATE_T_EXPANDING_PENDING] = UWB_DRP_REASON_PENDING,
[UWB_RSV_STATE_T_EXPANDING_DENIED] = UWB_DRP_REASON_DENIED,
};
return companion_reason_codes[rsv->state];
}
/*
* Return the status bit for a reservations's DRP IE.
*/
int uwb_rsv_status(struct uwb_rsv *rsv)
{
static const int statuses[] = {
[UWB_RSV_STATE_O_INITIATED] = 0,
[UWB_RSV_STATE_O_PENDING] = 0,
[UWB_RSV_STATE_O_MODIFIED] = 1,
[UWB_RSV_STATE_O_ESTABLISHED] = 1,
[UWB_RSV_STATE_O_TO_BE_MOVED] = 0,
[UWB_RSV_STATE_O_MOVE_COMBINING] = 1,
[UWB_RSV_STATE_O_MOVE_REDUCING] = 1,
[UWB_RSV_STATE_O_MOVE_EXPANDING] = 1,
[UWB_RSV_STATE_T_ACCEPTED] = 1,
[UWB_RSV_STATE_T_CONFLICT] = 0,
[UWB_RSV_STATE_T_PENDING] = 0,
[UWB_RSV_STATE_T_DENIED] = 0,
[UWB_RSV_STATE_T_RESIZED] = 1,
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = 1,
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = 1,
[UWB_RSV_STATE_T_EXPANDING_PENDING] = 1,
[UWB_RSV_STATE_T_EXPANDING_DENIED] = 1,
};
return statuses[rsv->state];
}
/*
* Return the status bit for a reservations's companion DRP IE .
*/
int uwb_rsv_companion_status(struct uwb_rsv *rsv)
{
static const int companion_statuses[] = {
[UWB_RSV_STATE_O_MOVE_EXPANDING] = 0,
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = 1,
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = 0,
[UWB_RSV_STATE_T_EXPANDING_PENDING] = 0,
[UWB_RSV_STATE_T_EXPANDING_DENIED] = 0,
};
return companion_statuses[rsv->state];
}
/*
* Allocate a DRP IE.
*
@ -33,16 +123,12 @@
static struct uwb_ie_drp *uwb_drp_ie_alloc(void)
{
struct uwb_ie_drp *drp_ie;
unsigned tiebreaker;
drp_ie = kzalloc(sizeof(struct uwb_ie_drp) +
UWB_NUM_ZONES * sizeof(struct uwb_drp_alloc),
GFP_KERNEL);
if (drp_ie) {
drp_ie->hdr.element_id = UWB_IE_DRP;
get_random_bytes(&tiebreaker, sizeof(unsigned));
uwb_ie_drp_set_tiebreaker(drp_ie, tiebreaker & 1);
}
return drp_ie;
}
@ -103,43 +189,17 @@ static void uwb_drp_ie_from_bm(struct uwb_ie_drp *drp_ie,
*/
int uwb_drp_ie_update(struct uwb_rsv *rsv)
{
struct device *dev = &rsv->rc->uwb_dev.dev;
struct uwb_ie_drp *drp_ie;
int reason_code, status;
struct uwb_rsv_move *mv;
int unsafe;
switch (rsv->state) {
case UWB_RSV_STATE_NONE:
if (rsv->state == UWB_RSV_STATE_NONE) {
kfree(rsv->drp_ie);
rsv->drp_ie = NULL;
return 0;
case UWB_RSV_STATE_O_INITIATED:
reason_code = UWB_DRP_REASON_ACCEPTED;
status = 0;
break;
case UWB_RSV_STATE_O_PENDING:
reason_code = UWB_DRP_REASON_ACCEPTED;
status = 0;
break;
case UWB_RSV_STATE_O_MODIFIED:
reason_code = UWB_DRP_REASON_MODIFIED;
status = 1;
break;
case UWB_RSV_STATE_O_ESTABLISHED:
reason_code = UWB_DRP_REASON_ACCEPTED;
status = 1;
break;
case UWB_RSV_STATE_T_ACCEPTED:
reason_code = UWB_DRP_REASON_ACCEPTED;
status = 1;
break;
case UWB_RSV_STATE_T_DENIED:
reason_code = UWB_DRP_REASON_DENIED;
status = 0;
break;
default:
dev_dbg(dev, "rsv with unhandled state (%d)\n", rsv->state);
return -EINVAL;
}
unsafe = rsv->mas.unsafe ? 1 : 0;
if (rsv->drp_ie == NULL) {
rsv->drp_ie = uwb_drp_ie_alloc();
@ -148,9 +208,11 @@ int uwb_drp_ie_update(struct uwb_rsv *rsv)
}
drp_ie = rsv->drp_ie;
uwb_ie_drp_set_unsafe(drp_ie, unsafe);
uwb_ie_drp_set_tiebreaker(drp_ie, rsv->tiebreaker);
uwb_ie_drp_set_owner(drp_ie, uwb_rsv_is_owner(rsv));
uwb_ie_drp_set_status(drp_ie, status);
uwb_ie_drp_set_reason_code(drp_ie, reason_code);
uwb_ie_drp_set_status(drp_ie, uwb_rsv_status(rsv));
uwb_ie_drp_set_reason_code(drp_ie, uwb_rsv_reason_code(rsv));
uwb_ie_drp_set_stream_index(drp_ie, rsv->stream);
uwb_ie_drp_set_type(drp_ie, rsv->type);
@ -168,6 +230,27 @@ int uwb_drp_ie_update(struct uwb_rsv *rsv)
uwb_drp_ie_from_bm(drp_ie, &rsv->mas);
if (uwb_rsv_has_two_drp_ies(rsv)) {
mv = &rsv->mv;
if (mv->companion_drp_ie == NULL) {
mv->companion_drp_ie = uwb_drp_ie_alloc();
if (mv->companion_drp_ie == NULL)
return -ENOMEM;
}
drp_ie = mv->companion_drp_ie;
/* keep all the same configuration of the main drp_ie */
memcpy(drp_ie, rsv->drp_ie, sizeof(struct uwb_ie_drp));
/* FIXME: handle properly the unsafe bit */
uwb_ie_drp_set_unsafe(drp_ie, 1);
uwb_ie_drp_set_status(drp_ie, uwb_rsv_companion_status(rsv));
uwb_ie_drp_set_reason_code(drp_ie, uwb_rsv_companion_reason_code(rsv));
uwb_drp_ie_from_bm(drp_ie, &mv->companion_mas);
}
rsv->ie_valid = true;
return 0;
}
@ -218,6 +301,8 @@ void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie)
u8 zone;
u16 zone_mask;
bitmap_zero(bm->bm, UWB_NUM_MAS);
for (cnt = 0; cnt < numallocs; cnt++) {
alloc = &drp_ie->allocs[cnt];
zone_bm = le16_to_cpu(alloc->zone_bm);
@ -229,3 +314,4 @@ void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie)
}
}
}

685
drivers/uwb/drp.c
View File

@ -23,6 +23,59 @@
#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 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;
dev_dbg(dev, "reservation timeout in state %s (%d)\n",
uwb_rsv_state_str(rsv->state), rsv->state);
switch (rsv->state) {
case UWB_RSV_STATE_O_INITIATED:
if (rsv->is_multicast) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
return;
}
break;
case UWB_RSV_STATE_O_ESTABLISHED:
if (rsv->is_multicast)
return;
break;
default:
break;
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;
}
uwb_rsv_remove(rsv);
/* [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);
}
}
/*
* 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:
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;
}
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;
case UWB_DRP_REASON_MODIFIED:
dev_err(dev, "FIXME: unhandled reason code (%d/%d)\n",
reason_code, status);
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);
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.
@ -248,14 +655,44 @@ 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, drp_ie);
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.
@ -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);

482
drivers/uwb/rsv.c
View File

@ -17,20 +17,31 @@
*/
#include <linux/kernel.h>
#include <linux/uwb.h>
#include <linux/random.h>
#include "uwb-internal.h"
static void uwb_rsv_timer(unsigned long arg);
static const char *rsv_states[] = {
[UWB_RSV_STATE_NONE] = "none",
[UWB_RSV_STATE_O_INITIATED] = "initiated",
[UWB_RSV_STATE_O_PENDING] = "pending",
[UWB_RSV_STATE_O_MODIFIED] = "modified",
[UWB_RSV_STATE_O_ESTABLISHED] = "established",
[UWB_RSV_STATE_T_ACCEPTED] = "accepted",
[UWB_RSV_STATE_T_DENIED] = "denied",
[UWB_RSV_STATE_T_PENDING] = "pending",
[UWB_RSV_STATE_NONE] = "none ",
[UWB_RSV_STATE_O_INITIATED] = "o initiated ",
[UWB_RSV_STATE_O_PENDING] = "o pending ",
[UWB_RSV_STATE_O_MODIFIED] = "o modified ",
[UWB_RSV_STATE_O_ESTABLISHED] = "o established ",
[UWB_RSV_STATE_O_TO_BE_MOVED] = "o to be moved ",
[UWB_RSV_STATE_O_MOVE_EXPANDING] = "o move expanding",
[UWB_RSV_STATE_O_MOVE_COMBINING] = "o move combining",
[UWB_RSV_STATE_O_MOVE_REDUCING] = "o move reducing ",
[UWB_RSV_STATE_T_ACCEPTED] = "t accepted ",
[UWB_RSV_STATE_T_CONFLICT] = "t conflict ",
[UWB_RSV_STATE_T_PENDING] = "t pending ",
[UWB_RSV_STATE_T_DENIED] = "t denied ",
[UWB_RSV_STATE_T_RESIZED] = "t resized ",
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = "t expanding acc ",
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = "t expanding conf",
[UWB_RSV_STATE_T_EXPANDING_PENDING] = "t expanding pend",
[UWB_RSV_STATE_T_EXPANDING_DENIED] = "t expanding den ",
};
static const char *rsv_types[] = {
@ -41,6 +52,31 @@ static const char *rsv_types[] = {
[UWB_DRP_TYPE_PCA] = "pca",
};
bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv)
{
static const bool has_two_drp_ies[] = {
[UWB_RSV_STATE_O_INITIATED] = false,
[UWB_RSV_STATE_O_PENDING] = false,
[UWB_RSV_STATE_O_MODIFIED] = false,
[UWB_RSV_STATE_O_ESTABLISHED] = false,
[UWB_RSV_STATE_O_TO_BE_MOVED] = false,
[UWB_RSV_STATE_O_MOVE_COMBINING] = false,
[UWB_RSV_STATE_O_MOVE_REDUCING] = false,
[UWB_RSV_STATE_O_MOVE_EXPANDING] = true,
[UWB_RSV_STATE_T_ACCEPTED] = false,
[UWB_RSV_STATE_T_CONFLICT] = false,
[UWB_RSV_STATE_T_PENDING] = false,
[UWB_RSV_STATE_T_DENIED] = false,
[UWB_RSV_STATE_T_RESIZED] = false,
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = true,
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = true,
[UWB_RSV_STATE_T_EXPANDING_PENDING] = true,
[UWB_RSV_STATE_T_EXPANDING_DENIED] = true,
};
return has_two_drp_ies[rsv->state];
}
/**
* uwb_rsv_state_str - return a string for a reservation state
* @state: the reservation state.
@ -65,7 +101,7 @@ const char *uwb_rsv_type_str(enum uwb_drp_type type)
}
EXPORT_SYMBOL_GPL(uwb_rsv_type_str);
static void uwb_rsv_dump(struct uwb_rsv *rsv)
void uwb_rsv_dump(char *text, struct uwb_rsv *rsv)
{
struct device *dev = &rsv->rc->uwb_dev.dev;
struct uwb_dev_addr devaddr;
@ -88,12 +124,12 @@ static void uwb_rsv_release(struct kref *kref)
kfree(rsv);
}
static void uwb_rsv_get(struct uwb_rsv *rsv)
void uwb_rsv_get(struct uwb_rsv *rsv)
{
kref_get(&rsv->kref);
}
static void uwb_rsv_put(struct uwb_rsv *rsv)
void uwb_rsv_put(struct uwb_rsv *rsv)
{
kref_put(&rsv->kref, uwb_rsv_release);
}
@ -108,6 +144,7 @@ static void uwb_rsv_put(struct uwb_rsv *rsv)
static int uwb_rsv_get_stream(struct uwb_rsv *rsv)
{
struct uwb_rc *rc = rsv->rc;
struct device *dev = &rc->uwb_dev.dev;
unsigned long *streams_bm;
int stream;
@ -129,12 +166,15 @@ static int uwb_rsv_get_stream(struct uwb_rsv *rsv)
rsv->stream = stream;
set_bit(stream, streams_bm);
dev_dbg(dev, "get stream %d\n", rsv->stream);
return 0;
}
static void uwb_rsv_put_stream(struct uwb_rsv *rsv)
{
struct uwb_rc *rc = rsv->rc;
struct device *dev = &rc->uwb_dev.dev;
unsigned long *streams_bm;
switch (rsv->target.type) {
@ -149,86 +189,52 @@ static void uwb_rsv_put_stream(struct uwb_rsv *rsv)
}
clear_bit(rsv->stream, streams_bm);
dev_dbg(dev, "put stream %d\n", rsv->stream);
}
/*
* Generate a MAS allocation with a single row component.
*/
static void uwb_rsv_gen_alloc_row(struct uwb_mas_bm *mas,
int first_mas, int mas_per_zone,
int zs, int ze)
void uwb_rsv_backoff_win_timer(unsigned long arg)
{
struct uwb_mas_bm col;
int z;
struct uwb_drp_backoff_win *bow = (struct uwb_drp_backoff_win *)arg;
struct uwb_rc *rc = container_of(bow, struct uwb_rc, bow);
struct device *dev = &rc->uwb_dev.dev;
bitmap_zero(mas->bm, UWB_NUM_MAS);
bitmap_zero(col.bm, UWB_NUM_MAS);
bitmap_fill(col.bm, mas_per_zone);
bitmap_shift_left(col.bm, col.bm, first_mas + zs * UWB_MAS_PER_ZONE, UWB_NUM_MAS);
for (z = zs; z <= ze; z++) {
bitmap_or(mas->bm, mas->bm, col.bm, UWB_NUM_MAS);
bitmap_shift_left(col.bm, col.bm, UWB_MAS_PER_ZONE, UWB_NUM_MAS);
bow->can_reserve_extra_mases = true;
if (bow->total_expired <= 4) {
bow->total_expired++;
} else {
/* after 4 backoff window has expired we can exit from
* the backoff procedure */
bow->total_expired = 0;
bow->window = UWB_DRP_BACKOFF_WIN_MIN >> 1;
}
dev_dbg(dev, "backoff_win_timer total_expired=%d, n=%d\n: ", bow->total_expired, bow->n);
/* try to relocate all the "to be moved" relocations */
uwb_rsv_handle_drp_avail_change(rc);
}
/*
* Allocate some MAS for this reservation based on current local
* availability, the reservation parameters (max_mas, min_mas,
* sparsity), and the WiMedia rules for MAS allocations.
*
* Returns -EBUSY is insufficient free MAS are available.
*
* FIXME: to simplify this, only safe reservations with a single row
* component in zones 1 to 15 are tried (zone 0 is skipped to avoid
* problems with the MAS reserved for the BP).
*
* [ECMA-368] section B.2.
*/
static int uwb_rsv_alloc_mas(struct uwb_rsv *rsv)
void uwb_rsv_backoff_win_increment(struct uwb_rc *rc)
{
static const int safe_mas_in_row[UWB_NUM_ZONES] = {
8, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1,
};
int n, r;
struct uwb_mas_bm mas;
bool found = false;
struct uwb_drp_backoff_win *bow = &rc->bow;
struct device *dev = &rc->uwb_dev.dev;
unsigned timeout_us;
/*
* Search all valid safe allocations until either: too few MAS
* are available; or the smallest allocation with sufficient
* MAS is found.
*
* The top of the zones are preferred, so space for larger
* allocations is available in the bottom of the zone (e.g., a
* 15 MAS allocation should start in row 14 leaving space for
* a 120 MAS allocation at row 0).
*/
for (n = safe_mas_in_row[0]; n >= 1; n--) {
int num_mas;
dev_dbg(dev, "backoff_win_increment: window=%d\n", bow->window);
num_mas = n * (UWB_NUM_ZONES - 1);
if (num_mas < rsv->min_mas)
break;
if (found && num_mas < rsv->max_mas)
break;
bow->can_reserve_extra_mases = false;
for (r = UWB_MAS_PER_ZONE-1; r >= 0; r--) {
if (safe_mas_in_row[r] < n)
continue;
uwb_rsv_gen_alloc_row(&mas, r, n, 1, UWB_NUM_ZONES);
if (uwb_drp_avail_reserve_pending(rsv->rc, &mas) == 0) {
found = true;
break;
}
}
}
if((bow->window << 1) == UWB_DRP_BACKOFF_WIN_MAX)
return;
if (!found)
return -EBUSY;
bow->window <<= 1;
bow->n = random32() & (bow->window - 1);
dev_dbg(dev, "new_window=%d, n=%d\n: ", bow->window, bow->n);
bitmap_copy(rsv->mas.bm, mas.bm, UWB_NUM_MAS);
return 0;
/* reset the timer associated variables */
timeout_us = bow->n * UWB_SUPERFRAME_LENGTH_US;
bow->total_expired = 0;
mod_timer(&bow->timer, jiffies + usecs_to_jiffies(timeout_us));
}
static void uwb_rsv_stroke_timer(struct uwb_rsv *rsv)
@ -241,13 +247,16 @@ static void uwb_rsv_stroke_timer(struct uwb_rsv *rsv)
* received.
*/
if (rsv->is_multicast) {
if (rsv->state == UWB_RSV_STATE_O_INITIATED)
if (rsv->state == UWB_RSV_STATE_O_INITIATED
|| rsv->state == UWB_RSV_STATE_O_MOVE_EXPANDING
|| rsv->state == UWB_RSV_STATE_O_MOVE_COMBINING
|| rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING)
sframes = 1;
if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED)
sframes = 0;
}
rsv->expired = false;
if (sframes > 0) {
/*
* Add an additional 2 superframes to account for the
@ -269,7 +278,7 @@ static void uwb_rsv_state_update(struct uwb_rsv *rsv,
rsv->state = new_state;
rsv->ie_valid = false;
uwb_rsv_dump(rsv);
uwb_rsv_dump("SU", rsv);
uwb_rsv_stroke_timer(rsv);
uwb_rsv_sched_update(rsv->rc);
@ -283,10 +292,17 @@ static void uwb_rsv_callback(struct uwb_rsv *rsv)
void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state)
{
struct uwb_rsv_move *mv = &rsv->mv;
if (rsv->state == new_state) {
switch (rsv->state) {
case UWB_RSV_STATE_O_ESTABLISHED:
case UWB_RSV_STATE_O_MOVE_EXPANDING:
case UWB_RSV_STATE_O_MOVE_COMBINING:
case UWB_RSV_STATE_O_MOVE_REDUCING:
case UWB_RSV_STATE_T_ACCEPTED:
case UWB_RSV_STATE_T_EXPANDING_ACCEPTED:
case UWB_RSV_STATE_T_RESIZED:
case UWB_RSV_STATE_NONE:
uwb_rsv_stroke_timer(rsv);
break;
@ -298,11 +314,10 @@ void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state)
return;
}
uwb_rsv_dump("SC", rsv);
switch (new_state) {
case UWB_RSV_STATE_NONE:
uwb_drp_avail_release(rsv->rc, &rsv->mas);
if (uwb_rsv_is_owner(rsv))
uwb_rsv_put_stream(rsv);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_NONE);
uwb_rsv_callback(rsv);
break;
@ -312,12 +327,45 @@ void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state)
case UWB_RSV_STATE_O_PENDING:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_PENDING);
break;
case UWB_RSV_STATE_O_MODIFIED:
/* in the companion there are the MASes to drop */
bitmap_andnot(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MODIFIED);
break;
case UWB_RSV_STATE_O_ESTABLISHED:
if (rsv->state == UWB_RSV_STATE_O_MODIFIED
|| rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) {
uwb_drp_avail_release(rsv->rc, &mv->companion_mas);
rsv->needs_release_companion_mas = false;
}
uwb_drp_avail_reserve(rsv->rc, &rsv->mas);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_ESTABLISHED);
uwb_rsv_callback(rsv);
break;
case UWB_RSV_STATE_O_MOVE_EXPANDING:
rsv->needs_release_companion_mas = true;
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING);
break;
case UWB_RSV_STATE_O_MOVE_COMBINING:
rsv->needs_release_companion_mas = false;
uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas);
bitmap_or(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS);
rsv->mas.safe += mv->companion_mas.safe;
rsv->mas.unsafe += mv->companion_mas.unsafe;
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_COMBINING);
break;
case UWB_RSV_STATE_O_MOVE_REDUCING:
bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS);
rsv->needs_release_companion_mas = true;
rsv->mas.safe = mv->final_mas.safe;
rsv->mas.unsafe = mv->final_mas.unsafe;
bitmap_copy(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS);
bitmap_copy(rsv->mas.unsafe_bm, mv->final_mas.unsafe_bm, UWB_NUM_MAS);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_REDUCING);
break;
case UWB_RSV_STATE_T_ACCEPTED:
case UWB_RSV_STATE_T_RESIZED:
rsv->needs_release_companion_mas = false;
uwb_drp_avail_reserve(rsv->rc, &rsv->mas);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_ACCEPTED);
uwb_rsv_callback(rsv);
@ -325,12 +373,82 @@ void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state)
case UWB_RSV_STATE_T_DENIED:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_DENIED);
break;
case UWB_RSV_STATE_T_CONFLICT:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_CONFLICT);
break;
case UWB_RSV_STATE_T_PENDING:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_PENDING);
break;
case UWB_RSV_STATE_T_EXPANDING_ACCEPTED:
rsv->needs_release_companion_mas = true;
uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_EXPANDING_ACCEPTED);
break;
default:
dev_err(&rsv->rc->uwb_dev.dev, "unhandled state: %s (%d)\n",
uwb_rsv_state_str(new_state), new_state);
}
}
static void uwb_rsv_handle_timeout_work(struct work_struct *work)
{
struct uwb_rsv *rsv = container_of(work, struct uwb_rsv,
handle_timeout_work);
struct uwb_rc *rc = rsv->rc;
mutex_lock(&rc->rsvs_mutex);
uwb_rsv_dump("TO", rsv);
switch (rsv->state) {
case UWB_RSV_STATE_O_INITIATED:
if (rsv->is_multicast) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
goto unlock;
}
break;
case UWB_RSV_STATE_O_MOVE_EXPANDING:
if (rsv->is_multicast) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING);
goto unlock;
}
break;
case UWB_RSV_STATE_O_MOVE_COMBINING:
if (rsv->is_multicast) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING);
goto unlock;
}
break;
case UWB_RSV_STATE_O_MOVE_REDUCING:
if (rsv->is_multicast) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
goto unlock;
}
break;
case UWB_RSV_STATE_O_ESTABLISHED:
if (rsv->is_multicast)
goto unlock;
break;
case UWB_RSV_STATE_T_EXPANDING_ACCEPTED:
/*
* The time out could be for the main or of the
* companion DRP, assume it's for the companion and
* drop that first. A further time out is required to
* drop the main.
*/
uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED);
uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas);
goto unlock;
default:
break;
}
uwb_rsv_remove(rsv);
unlock:
mutex_unlock(&rc->rsvs_mutex);
}
static struct uwb_rsv *uwb_rsv_alloc(struct uwb_rc *rc)
{
struct uwb_rsv *rsv;
@ -347,6 +465,7 @@ static struct uwb_rsv *uwb_rsv_alloc(struct uwb_rc *rc)
rsv->timer.data = (unsigned long)rsv;
rsv->rc = rc;
INIT_WORK(&rsv->handle_timeout_work, uwb_rsv_handle_timeout_work);
return rsv;
}
@ -381,8 +500,18 @@ EXPORT_SYMBOL_GPL(uwb_rsv_create);
void uwb_rsv_remove(struct uwb_rsv *rsv)
{
uwb_rsv_dump("RM", rsv);
if (rsv->state != UWB_RSV_STATE_NONE)
uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
if (rsv->needs_release_companion_mas)
uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas);
uwb_drp_avail_release(rsv->rc, &rsv->mas);
if (uwb_rsv_is_owner(rsv))
uwb_rsv_put_stream(rsv);
del_timer_sync(&rsv->timer);
uwb_dev_put(rsv->owner);
if (rsv->target.type == UWB_RSV_TARGET_DEV)
@ -409,7 +538,7 @@ EXPORT_SYMBOL_GPL(uwb_rsv_destroy);
* @rsv: the reservation
*
* The PAL should fill in @rsv's owner, target, type, max_mas,
* min_mas, sparsity and is_multicast fields. If the target is a
* min_mas, max_interval and is_multicast fields. If the target is a
* uwb_dev it must be referenced.
*
* The reservation's callback will be called when the reservation is
@ -418,16 +547,27 @@ EXPORT_SYMBOL_GPL(uwb_rsv_destroy);
int uwb_rsv_establish(struct uwb_rsv *rsv)
{
struct uwb_rc *rc = rsv->rc;
struct uwb_mas_bm available;
int ret;
mutex_lock(&rc->rsvs_mutex);
ret = uwb_rsv_get_stream(rsv);
if (ret)
goto out;
ret = uwb_rsv_alloc_mas(rsv);
if (ret) {
rsv->tiebreaker = random32() & 1;
/* get available mas bitmap */
uwb_drp_available(rc, &available);
ret = uwb_rsv_find_best_allocation(rsv, &available, &rsv->mas);
if (ret == UWB_RSV_ALLOC_NOT_FOUND) {
ret = -EBUSY;
uwb_rsv_put_stream(rsv);
goto out;
}
ret = uwb_drp_avail_reserve_pending(rc, &rsv->mas);
if (ret != 0) {
uwb_rsv_put_stream(rsv);
goto out;
}
@ -448,16 +588,71 @@ EXPORT_SYMBOL_GPL(uwb_rsv_establish);
* @rsv: the reservation to modify
* @max_mas: new maximum MAS to reserve
* @min_mas: new minimum MAS to reserve
* @sparsity: new sparsity to use
* @max_interval: new max_interval to use
*
* FIXME: implement this once there are PALs that use it.
*/
int uwb_rsv_modify(struct uwb_rsv *rsv, int max_mas, int min_mas, int sparsity)
int uwb_rsv_modify(struct uwb_rsv *rsv, int max_mas, int min_mas, int max_interval)
{
return -ENOSYS;
}
EXPORT_SYMBOL_GPL(uwb_rsv_modify);
/*
* move an already established reservation (rc->rsvs_mutex must to be
* taken when tis function is called)
*/
int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available)
{
struct uwb_rc *rc = rsv->rc;
struct uwb_drp_backoff_win *bow = &rc->bow;
struct device *dev = &rc->uwb_dev.dev;
struct uwb_rsv_move *mv;
int ret = 0;
if (bow->can_reserve_extra_mases == false)
return -EBUSY;
mv = &rsv->mv;
if (uwb_rsv_find_best_allocation(rsv, available, &mv->final_mas) == UWB_RSV_ALLOC_FOUND) {
if (!bitmap_equal(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS)) {
/* We want to move the reservation */
bitmap_andnot(mv->companion_mas.bm, mv->final_mas.bm, rsv->mas.bm, UWB_NUM_MAS);
uwb_drp_avail_reserve_pending(rc, &mv->companion_mas);
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING);
}
} else {
dev_dbg(dev, "new allocation not found\n");
}
return ret;
}
/* It will try to move every reservation in state O_ESTABLISHED giving
* to the MAS allocator algorithm an availability that is the real one
* plus the allocation already established from the reservation. */
void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc)
{
struct uwb_drp_backoff_win *bow = &rc->bow;
struct uwb_rsv *rsv;
struct uwb_mas_bm mas;
if (bow->can_reserve_extra_mases == false)
return;
list_for_each_entry(rsv, &rc->reservations, rc_node) {
if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED ||
rsv->state == UWB_RSV_STATE_O_TO_BE_MOVED) {
uwb_drp_available(rc, &mas);
bitmap_or(mas.bm, mas.bm, rsv->mas.bm, UWB_NUM_MAS);
uwb_rsv_try_move(rsv, &mas);
}
}
}
/**
* uwb_rsv_terminate - terminate an established reservation
* @rsv: the reservation to terminate
@ -546,6 +741,7 @@ static struct uwb_rsv *uwb_rsv_new_target(struct uwb_rc *rc,
uwb_dev_get(rsv->owner);
rsv->target.type = UWB_RSV_TARGET_DEV;
rsv->target.dev = &rc->uwb_dev;
uwb_dev_get(&rc->uwb_dev);
rsv->type = uwb_ie_drp_type(drp_ie);
rsv->stream = uwb_ie_drp_stream_index(drp_ie);
uwb_drp_ie_to_bm(&rsv->mas, drp_ie);
@ -567,11 +763,33 @@ static struct uwb_rsv *uwb_rsv_new_target(struct uwb_rc *rc,
list_add_tail(&rsv->rc_node, &rc->reservations);
state = rsv->state;
rsv->state = UWB_RSV_STATE_NONE;
uwb_rsv_set_state(rsv, state);
/* FIXME: do something sensible here */
if (state == UWB_RSV_STATE_T_ACCEPTED
&& uwb_drp_avail_reserve_pending(rc, &rsv->mas) == -EBUSY) {
/* FIXME: do something sensible here */
} else {
uwb_rsv_set_state(rsv, state);
}
return rsv;
}
/**
* uwb_rsv_get_usable_mas - get the bitmap of the usable MAS of a reservations
* @rsv: the reservation.
* @mas: returns the available MAS.
*
* The usable MAS of a reservation may be less than the negotiated MAS
* if alien BPs are present.
*/
void uwb_rsv_get_usable_mas(struct uwb_rsv *rsv, struct uwb_mas_bm *mas)
{
bitmap_zero(mas->bm, UWB_NUM_MAS);
bitmap_andnot(mas->bm, rsv->mas.bm, rsv->rc->cnflt_alien_bitmap.bm, UWB_NUM_MAS);
}
EXPORT_SYMBOL_GPL(uwb_rsv_get_usable_mas);
/**
* uwb_rsv_find - find a reservation for a received DRP IE.
* @rc: the radio controller
@ -611,8 +829,6 @@ static bool uwb_rsv_update_all(struct uwb_rc *rc)
bool ie_updated = false;
list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) {
if (rsv->expired)
uwb_drp_handle_timeout(rsv);
if (!rsv->ie_valid) {
uwb_drp_ie_update(rsv);
ie_updated = true;
@ -622,9 +838,47 @@ static bool uwb_rsv_update_all(struct uwb_rc *rc)
return ie_updated;
}
void uwb_rsv_queue_update(struct uwb_rc *rc)
{
unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE;
queue_delayed_work(rc->rsv_workq, &rc->rsv_update_work, usecs_to_jiffies(delay_us));
}
/**
* uwb_rsv_sched_update - schedule an update of the DRP IEs
* @rc: the radio controller.
*
* To improve performance and ensure correctness with [ECMA-368] the
* number of SET-DRP-IE commands that are done are limited.
*
* DRP IEs update come from two sources: DRP events from the hardware
* which all occur at the beginning of the superframe ('syncronous'
* events) and reservation establishment/termination requests from
* PALs or timers ('asynchronous' events).
*
* A delayed work ensures that all the synchronous events result in
* one SET-DRP-IE command.
*
* Additional logic (the set_drp_ie_pending and rsv_updated_postponed
* flags) will prevent an asynchrous event starting a SET-DRP-IE
* command if one is currently awaiting a response.
*
* FIXME: this does leave a window where an asynchrous event can delay
* the SET-DRP-IE for a synchronous event by one superframe.
*/
void uwb_rsv_sched_update(struct uwb_rc *rc)
{
queue_work(rc->rsv_workq, &rc->rsv_update_work);
spin_lock(&rc->rsvs_lock);
if (!delayed_work_pending(&rc->rsv_update_work)) {
if (rc->set_drp_ie_pending > 0) {
rc->set_drp_ie_pending++;
goto unlock;
}
uwb_rsv_queue_update(rc);
}
unlock:
spin_unlock(&rc->rsvs_lock);
}
/*
@ -633,7 +887,8 @@ void uwb_rsv_sched_update(struct uwb_rc *rc)
*/
static void uwb_rsv_update_work(struct work_struct *work)
{
struct uwb_rc *rc = container_of(work, struct uwb_rc, rsv_update_work);
struct uwb_rc *rc = container_of(work, struct uwb_rc,
rsv_update_work.work);
bool ie_updated;
mutex_lock(&rc->rsvs_mutex);
@ -645,18 +900,34 @@ static void uwb_rsv_update_work(struct work_struct *work)
ie_updated = true;
}
if (ie_updated)
if (ie_updated && (rc->set_drp_ie_pending == 0))
uwb_rc_send_all_drp_ie(rc);
mutex_unlock(&rc->rsvs_mutex);
}
static void uwb_rsv_alien_bp_work(struct work_struct *work)
{
struct uwb_rc *rc = container_of(work, struct uwb_rc,
rsv_alien_bp_work.work);
struct uwb_rsv *rsv;
mutex_lock(&rc->rsvs_mutex);
list_for_each_entry(rsv, &rc->reservations, rc_node) {
if (rsv->type != UWB_DRP_TYPE_ALIEN_BP) {
rsv->callback(rsv);
}
}
mutex_unlock(&rc->rsvs_mutex);
}
static void uwb_rsv_timer(unsigned long arg)
{
struct uwb_rsv *rsv = (struct uwb_rsv *)arg;
rsv->expired = true;
uwb_rsv_sched_update(rsv->rc);
queue_work(rsv->rc->rsv_workq, &rsv->handle_timeout_work);
}
/**
@ -673,16 +944,27 @@ void uwb_rsv_remove_all(struct uwb_rc *rc)
list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) {
uwb_rsv_remove(rsv);
}
/* Cancel any postponed update. */
rc->set_drp_ie_pending = 0;
mutex_unlock(&rc->rsvs_mutex);
cancel_work_sync(&rc->rsv_update_work);
cancel_delayed_work_sync(&rc->rsv_update_work);
}
void uwb_rsv_init(struct uwb_rc *rc)
{
INIT_LIST_HEAD(&rc->reservations);
INIT_LIST_HEAD(&rc->cnflt_alien_list);
mutex_init(&rc->rsvs_mutex);
INIT_WORK(&rc->rsv_update_work, uwb_rsv_update_work);
spin_lock_init(&rc->rsvs_lock);
INIT_DELAYED_WORK(&rc->rsv_update_work, uwb_rsv_update_work);
INIT_DELAYED_WORK(&rc->rsv_alien_bp_work, uwb_rsv_alien_bp_work);
rc->bow.can_reserve_extra_mases = true;
rc->bow.total_expired = 0;
rc->bow.window = UWB_DRP_BACKOFF_WIN_MIN >> 1;
init_timer(&rc->bow.timer);
rc->bow.timer.function = uwb_rsv_backoff_win_timer;
rc->bow.timer.data = (unsigned long)&rc->bow;
bitmap_complement(rc->uwb_dev.streams, rc->uwb_dev.streams, UWB_NUM_STREAMS);
}

49
drivers/uwb/uwb-debug.c
View File

@ -82,29 +82,21 @@ struct uwb_dbg {
struct dentry *reservations_f;
struct dentry *accept_f;
struct dentry *drp_avail_f;
spinlock_t list_lock;
};
static struct dentry *root_dir;
static void uwb_dbg_rsv_cb(struct uwb_rsv *rsv)
{
struct uwb_rc *rc = rsv->rc;
struct device *dev = &rc->uwb_dev.dev;
struct uwb_dev_addr devaddr;
char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
struct uwb_dbg *dbg = rsv->pal_priv;
uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
if (rsv->target.type == UWB_RSV_TARGET_DEV)
devaddr = rsv->target.dev->dev_addr;
else
devaddr = rsv->target.devaddr;
uwb_dev_addr_print(target, sizeof(target), &devaddr);
dev_dbg(dev, "debug: rsv %s -> %s: %s\n",
owner, target, uwb_rsv_state_str(rsv->state));
uwb_rsv_dump("debug", rsv);
if (rsv->state == UWB_RSV_STATE_NONE) {
spin_lock(&dbg->list_lock);
list_del(&rsv->pal_node);
spin_unlock(&dbg->list_lock);
uwb_rsv_destroy(rsv);
}
}
@ -128,20 +120,21 @@ static int cmd_rsv_establish(struct uwb_rc *rc,
return -ENOMEM;
}
rsv->owner = &rc->uwb_dev;
rsv->target.type = UWB_RSV_TARGET_DEV;
rsv->target.dev = target;
rsv->type = cmd->type;
rsv->max_mas = cmd->max_mas;
rsv->min_mas = cmd->min_mas;
rsv->sparsity = cmd->sparsity;
rsv->target.type = UWB_RSV_TARGET_DEV;
rsv->target.dev = target;
rsv->type = cmd->type;
rsv->max_mas = cmd->max_mas;
rsv->min_mas = cmd->min_mas;
rsv->max_interval = cmd->max_interval;
ret = uwb_rsv_establish(rsv);
if (ret)
uwb_rsv_destroy(rsv);
else
else {
spin_lock(&(rc->dbg)->list_lock);
list_add_tail(&rsv->pal_node, &rc->dbg->rsvs);
spin_unlock(&(rc->dbg)->list_lock);
}
return ret;
}
@ -151,17 +144,24 @@ static int cmd_rsv_terminate(struct uwb_rc *rc,
struct uwb_rsv *rsv, *found = NULL;
int i = 0;
spin_lock(&(rc->dbg)->list_lock);
list_for_each_entry(rsv, &rc->dbg->rsvs, pal_node) {
if (i == cmd->index) {
found = rsv;
uwb_rsv_get(found);
break;
}
i++;
}
spin_unlock(&(rc->dbg)->list_lock);
if (!found)
return -EINVAL;
uwb_rsv_terminate(found);
uwb_rsv_put(found);
return 0;
}
@ -191,7 +191,7 @@ static ssize_t command_write(struct file *file, const char __user *buf,
struct uwb_rc *rc = file->private_data;
struct uwb_dbg_cmd cmd;
int ret = 0;
if (len != sizeof(struct uwb_dbg_cmd))
return -EINVAL;
@ -325,7 +325,9 @@ static void uwb_dbg_new_rsv(struct uwb_pal *pal, struct uwb_rsv *rsv)
struct uwb_dbg *dbg = container_of(pal, struct uwb_dbg, pal);
if (dbg->accept) {
spin_lock(&dbg->list_lock);
list_add_tail(&rsv->pal_node, &dbg->rsvs);
spin_unlock(&dbg->list_lock);
uwb_rsv_accept(rsv, uwb_dbg_rsv_cb, dbg);
}
}
@ -341,6 +343,7 @@ void uwb_dbg_add_rc(struct uwb_rc *rc)
return;
INIT_LIST_HEAD(&rc->dbg->rsvs);
spin_lock_init(&(rc->dbg)->list_lock);
uwb_pal_init(&rc->dbg->pal);
rc->dbg->pal.rc = rc;

80
drivers/uwb/uwb-internal.h
View File

@ -92,6 +92,12 @@ extern const char *uwb_rc_strerror(unsigned code);
struct uwb_rc_neh;
extern int uwb_rc_cmd_async(struct uwb_rc *rc, const char *cmd_name,
struct uwb_rccb *cmd, size_t cmd_size,
u8 expected_type, u16 expected_event,
uwb_rc_cmd_cb_f cb, void *arg);
void uwb_rc_neh_create(struct uwb_rc *rc);
void uwb_rc_neh_destroy(struct uwb_rc *rc);
@ -106,7 +112,69 @@ void uwb_rc_neh_put(struct uwb_rc_neh *neh);
extern int uwb_est_create(void);
extern void uwb_est_destroy(void);
/*
* UWB conflicting alien reservations
*/
struct uwb_cnflt_alien {
struct uwb_rc *rc;
struct list_head rc_node;
struct uwb_mas_bm mas;
struct timer_list timer;
struct work_struct cnflt_update_work;
};
enum uwb_uwb_rsv_alloc_result {
UWB_RSV_ALLOC_FOUND = 0,
UWB_RSV_ALLOC_NOT_FOUND,
};
enum uwb_rsv_mas_status {
UWB_RSV_MAS_NOT_AVAIL = 1,
UWB_RSV_MAS_SAFE,
UWB_RSV_MAS_UNSAFE,
};
struct uwb_rsv_col_set_info {
unsigned char start_col;
unsigned char interval;
unsigned char safe_mas_per_col;
unsigned char unsafe_mas_per_col;
};
struct uwb_rsv_col_info {
unsigned char max_avail_safe;
unsigned char max_avail_unsafe;
unsigned char highest_mas[UWB_MAS_PER_ZONE];
struct uwb_rsv_col_set_info csi;
};
struct uwb_rsv_row_info {
unsigned char avail[UWB_MAS_PER_ZONE];
unsigned char free_rows;
unsigned char used_rows;
};
/*
* UWB find allocation
*/
struct uwb_rsv_alloc_info {
unsigned char bm[UWB_MAS_PER_ZONE * UWB_NUM_ZONES];
struct uwb_rsv_col_info ci[UWB_NUM_ZONES];
struct uwb_rsv_row_info ri;
struct uwb_mas_bm *not_available;
struct uwb_mas_bm *result;
int min_mas;
int max_mas;
int max_interval;
int total_allocated_mases;
int safe_allocated_mases;
int unsafe_allocated_mases;
int interval;
};
int uwb_rsv_find_best_allocation(struct uwb_rsv *rsv, struct uwb_mas_bm *available,
struct uwb_mas_bm *result);
void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc);
/*
* UWB Events & management daemon
*/
@ -254,18 +322,28 @@ void uwb_rsv_init(struct uwb_rc *rc);
int uwb_rsv_setup(struct uwb_rc *rc);
void uwb_rsv_cleanup(struct uwb_rc *rc);
void uwb_rsv_remove_all(struct uwb_rc *rc);
void uwb_rsv_get(struct uwb_rsv *rsv);
void uwb_rsv_put(struct uwb_rsv *rsv);
bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv);
void uwb_rsv_dump(char *text, struct uwb_rsv *rsv);
int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available);
void uwb_rsv_backoff_win_timer(unsigned long arg);
void uwb_rsv_backoff_win_increment(struct uwb_rc *rc);
int uwb_rsv_status(struct uwb_rsv *rsv);
int uwb_rsv_companion_status(struct uwb_rsv *rsv);
void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state);
void uwb_rsv_remove(struct uwb_rsv *rsv);
struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src,
struct uwb_ie_drp *drp_ie);
void uwb_rsv_sched_update(struct uwb_rc *rc);
void uwb_rsv_queue_update(struct uwb_rc *rc);
void uwb_drp_handle_timeout(struct uwb_rsv *rsv);
int uwb_drp_ie_update(struct uwb_rsv *rsv);
void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie);
void uwb_drp_avail_init(struct uwb_rc *rc);
void uwb_drp_available(struct uwb_rc *rc, struct uwb_mas_bm *avail);
int uwb_drp_avail_reserve_pending(struct uwb_rc *rc, struct uwb_mas_bm *mas);
void uwb_drp_avail_reserve(struct uwb_rc *rc, struct uwb_mas_bm *mas);
void uwb_drp_avail_release(struct uwb_rc *rc, struct uwb_mas_bm *mas);

47
include/linux/uwb.h
View File

@ -67,6 +67,7 @@ struct uwb_dev {
struct uwb_dev_addr dev_addr;
int beacon_slot;
DECLARE_BITMAP(streams, UWB_NUM_STREAMS);
DECLARE_BITMAP(last_availability_bm, UWB_NUM_MAS);
};
#define to_uwb_dev(d) container_of(d, struct uwb_dev, dev)
@ -109,6 +110,9 @@ struct uwbd {
*/
struct uwb_mas_bm {
DECLARE_BITMAP(bm, UWB_NUM_MAS);
DECLARE_BITMAP(unsafe_bm, UWB_NUM_MAS);
int safe;
int unsafe;
};
/**
@ -134,14 +138,24 @@ struct uwb_mas_bm {
* FIXME: further target states TBD.
*/
enum uwb_rsv_state {
UWB_RSV_STATE_NONE,
UWB_RSV_STATE_NONE = 0,
UWB_RSV_STATE_O_INITIATED,
UWB_RSV_STATE_O_PENDING,
UWB_RSV_STATE_O_MODIFIED,
UWB_RSV_STATE_O_ESTABLISHED,
UWB_RSV_STATE_O_TO_BE_MOVED,
UWB_RSV_STATE_O_MOVE_EXPANDING,
UWB_RSV_STATE_O_MOVE_COMBINING,
UWB_RSV_STATE_O_MOVE_REDUCING,
UWB_RSV_STATE_T_ACCEPTED,
UWB_RSV_STATE_T_DENIED,
UWB_RSV_STATE_T_CONFLICT,
UWB_RSV_STATE_T_PENDING,
UWB_RSV_STATE_T_EXPANDING_ACCEPTED,
UWB_RSV_STATE_T_EXPANDING_CONFLICT,
UWB_RSV_STATE_T_EXPANDING_PENDING,
UWB_RSV_STATE_T_EXPANDING_DENIED,
UWB_RSV_STATE_T_RESIZED,
UWB_RSV_STATE_LAST,
};
@ -166,6 +180,12 @@ struct uwb_rsv_target {
};
};
struct uwb_rsv_move {
struct uwb_mas_bm final_mas;
struct uwb_ie_drp *companion_drp_ie;
struct uwb_mas_bm companion_mas;
};
/*
* Number of streams reserved for reservations targeted at DevAddrs.
*/
@ -203,6 +223,7 @@ typedef void (*uwb_rsv_cb_f)(struct uwb_rsv *rsv);
*
* @status: negotiation status
* @stream: stream index allocated for this reservation
* @tiebreaker: conflict tiebreaker for this reservation
* @mas: reserved MAS
* @drp_ie: the DRP IE
* @ie_valid: true iff the DRP IE matches the reservation parameters
@ -225,19 +246,22 @@ struct uwb_rsv {
enum uwb_drp_type type;
int max_mas;
int min_mas;
int sparsity;
int max_interval;
bool is_multicast;
uwb_rsv_cb_f callback;
void *pal_priv;
enum uwb_rsv_state state;
bool needs_release_companion_mas;
u8 stream;
u8 tiebreaker;
struct uwb_mas_bm mas;
struct uwb_ie_drp *drp_ie;
struct uwb_rsv_move mv;
bool ie_valid;
struct timer_list timer;
bool expired;
struct work_struct handle_timeout_work;
};
static const
@ -279,6 +303,13 @@ struct uwb_drp_avail {
bool ie_valid;
};
struct uwb_drp_backoff_win {
u8 window;
u8 n;
int total_expired;
struct timer_list timer;
bool can_reserve_extra_mases;
};
const char *uwb_rsv_state_str(enum uwb_rsv_state state);
const char *uwb_rsv_type_str(enum uwb_drp_type type);
@ -294,6 +325,8 @@ void uwb_rsv_terminate(struct uwb_rsv *rsv);
void uwb_rsv_accept(struct uwb_rsv *rsv, uwb_rsv_cb_f cb, void *pal_priv);
void uwb_rsv_get_usable_mas(struct uwb_rsv *orig_rsv, struct uwb_mas_bm *mas);
/**
* Radio Control Interface instance
*
@ -364,12 +397,18 @@ struct uwb_rc {
struct uwbd uwbd;
struct uwb_drp_backoff_win bow;
struct uwb_drp_avail drp_avail;
struct list_head reservations;
struct list_head cnflt_alien_list;
struct uwb_mas_bm cnflt_alien_bitmap;
struct mutex rsvs_mutex;
spinlock_t rsvs_lock;
struct workqueue_struct *rsv_workq;
struct work_struct rsv_update_work;
struct delayed_work rsv_update_work;
struct delayed_work rsv_alien_bp_work;
int set_drp_ie_pending;
struct mutex ies_mutex;
struct uwb_rc_cmd_set_ie *ies;
size_t ies_capacity;

2
include/linux/uwb/debug-cmd.h
View File

@ -43,7 +43,7 @@ struct uwb_dbg_cmd_rsv_establish {
__u8 type;
__u16 max_mas;
__u16 min_mas;
__u8 sparsity;
__u8 max_interval;
};
struct uwb_dbg_cmd_rsv_terminate {

25
include/linux/uwb/spec.h
View File

@ -58,6 +58,11 @@ enum { UWB_NUM_ZONES = 16 };
*/
#define UWB_MAS_PER_ZONE (UWB_NUM_MAS / UWB_NUM_ZONES)
/*
* Number of MAS required before a row can be considered available.
*/
#define UWB_USABLE_MAS_PER_ROW (UWB_NUM_ZONES - 1)
/*
* Number of streams per DRP reservation between a pair of devices.
*
@ -93,6 +98,26 @@ enum { UWB_BEACON_SLOT_LENGTH_US = 85 };
*/
enum { UWB_MAX_LOST_BEACONS = 3 };
/*
* mDRPBackOffWinMin
*
* The minimum number of superframes to wait before trying to reserve
* extra MAS.
*
* [ECMA-368] section 17.16
*/
enum { UWB_DRP_BACKOFF_WIN_MIN = 2 };
/*
* mDRPBackOffWinMax
*
* The maximum number of superframes to wait before trying to reserve
* extra MAS.
*
* [ECMA-368] section 17.16
*/
enum { UWB_DRP_BACKOFF_WIN_MAX = 16 };
/*
* Length of a superframe in microseconds.
*/