2 * UWB DRP IE management.
4 * Copyright (C) 2005-2006 Intel Corporation
5 * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 #include <linux/kernel.h>
20 #include <linux/random.h>
21 #include <linux/slab.h>
22 #include <linux/uwb.h>
24 #include "uwb-internal.h"
28 * Return the reason code for a reservations's DRP IE.
30 int uwb_rsv_reason_code(struct uwb_rsv *rsv)
32 static const int reason_codes[] = {
33 [UWB_RSV_STATE_O_INITIATED] = UWB_DRP_REASON_ACCEPTED,
34 [UWB_RSV_STATE_O_PENDING] = UWB_DRP_REASON_ACCEPTED,
35 [UWB_RSV_STATE_O_MODIFIED] = UWB_DRP_REASON_MODIFIED,
36 [UWB_RSV_STATE_O_ESTABLISHED] = UWB_DRP_REASON_ACCEPTED,
37 [UWB_RSV_STATE_O_TO_BE_MOVED] = UWB_DRP_REASON_ACCEPTED,
38 [UWB_RSV_STATE_O_MOVE_COMBINING] = UWB_DRP_REASON_MODIFIED,
39 [UWB_RSV_STATE_O_MOVE_REDUCING] = UWB_DRP_REASON_MODIFIED,
40 [UWB_RSV_STATE_O_MOVE_EXPANDING] = UWB_DRP_REASON_ACCEPTED,
41 [UWB_RSV_STATE_T_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
42 [UWB_RSV_STATE_T_CONFLICT] = UWB_DRP_REASON_CONFLICT,
43 [UWB_RSV_STATE_T_PENDING] = UWB_DRP_REASON_PENDING,
44 [UWB_RSV_STATE_T_DENIED] = UWB_DRP_REASON_DENIED,
45 [UWB_RSV_STATE_T_RESIZED] = UWB_DRP_REASON_ACCEPTED,
46 [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
47 [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = UWB_DRP_REASON_CONFLICT,
48 [UWB_RSV_STATE_T_EXPANDING_PENDING] = UWB_DRP_REASON_PENDING,
49 [UWB_RSV_STATE_T_EXPANDING_DENIED] = UWB_DRP_REASON_DENIED,
52 return reason_codes[rsv->state];
56 * Return the reason code for a reservations's companion DRP IE .
58 int uwb_rsv_companion_reason_code(struct uwb_rsv *rsv)
60 static const int companion_reason_codes[] = {
61 [UWB_RSV_STATE_O_MOVE_EXPANDING] = UWB_DRP_REASON_ACCEPTED,
62 [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
63 [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = UWB_DRP_REASON_CONFLICT,
64 [UWB_RSV_STATE_T_EXPANDING_PENDING] = UWB_DRP_REASON_PENDING,
65 [UWB_RSV_STATE_T_EXPANDING_DENIED] = UWB_DRP_REASON_DENIED,
68 return companion_reason_codes[rsv->state];
72 * Return the status bit for a reservations's DRP IE.
74 int uwb_rsv_status(struct uwb_rsv *rsv)
76 static const int statuses[] = {
77 [UWB_RSV_STATE_O_INITIATED] = 0,
78 [UWB_RSV_STATE_O_PENDING] = 0,
79 [UWB_RSV_STATE_O_MODIFIED] = 1,
80 [UWB_RSV_STATE_O_ESTABLISHED] = 1,
81 [UWB_RSV_STATE_O_TO_BE_MOVED] = 0,
82 [UWB_RSV_STATE_O_MOVE_COMBINING] = 1,
83 [UWB_RSV_STATE_O_MOVE_REDUCING] = 1,
84 [UWB_RSV_STATE_O_MOVE_EXPANDING] = 1,
85 [UWB_RSV_STATE_T_ACCEPTED] = 1,
86 [UWB_RSV_STATE_T_CONFLICT] = 0,
87 [UWB_RSV_STATE_T_PENDING] = 0,
88 [UWB_RSV_STATE_T_DENIED] = 0,
89 [UWB_RSV_STATE_T_RESIZED] = 1,
90 [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = 1,
91 [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = 1,
92 [UWB_RSV_STATE_T_EXPANDING_PENDING] = 1,
93 [UWB_RSV_STATE_T_EXPANDING_DENIED] = 1,
97 return statuses[rsv->state];
101 * Return the status bit for a reservations's companion DRP IE .
103 int uwb_rsv_companion_status(struct uwb_rsv *rsv)
105 static const int companion_statuses[] = {
106 [UWB_RSV_STATE_O_MOVE_EXPANDING] = 0,
107 [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = 1,
108 [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = 0,
109 [UWB_RSV_STATE_T_EXPANDING_PENDING] = 0,
110 [UWB_RSV_STATE_T_EXPANDING_DENIED] = 0,
113 return companion_statuses[rsv->state];
119 * To save having to free/allocate a DRP IE when its MAS changes,
120 * enough memory is allocated for the maxiumum number of DRP
121 * allocation fields. This gives an overhead per reservation of up to
122 * (UWB_NUM_ZONES - 1) * 4 = 60 octets.
124 static struct uwb_ie_drp *uwb_drp_ie_alloc(void)
126 struct uwb_ie_drp *drp_ie;
128 drp_ie = kzalloc(sizeof(struct uwb_ie_drp) +
129 UWB_NUM_ZONES * sizeof(struct uwb_drp_alloc),
132 drp_ie->hdr.element_id = UWB_IE_DRP;
139 * Fill a DRP IE's allocation fields from a MAS bitmap.
141 static void uwb_drp_ie_from_bm(struct uwb_ie_drp *drp_ie,
142 struct uwb_mas_bm *mas)
144 int z, i, num_fields = 0, next = 0;
145 struct uwb_drp_alloc *zones;
147 DECLARE_BITMAP(tmp_bmp, UWB_NUM_MAS);
148 DECLARE_BITMAP(tmp_mas_bm, UWB_MAS_PER_ZONE);
150 zones = drp_ie->allocs;
152 bitmap_copy(tmp_bmp, mas->bm, UWB_NUM_MAS);
154 /* Determine unique MAS bitmaps in zones from bitmap. */
155 for (z = 0; z < UWB_NUM_ZONES; z++) {
156 bitmap_copy(tmp_mas_bm, tmp_bmp, UWB_MAS_PER_ZONE);
157 if (bitmap_weight(tmp_mas_bm, UWB_MAS_PER_ZONE) > 0) {
159 current_bmp = (__le16) *tmp_mas_bm;
160 for (i = 0; i < next; i++) {
161 if (current_bmp == zones[i].mas_bm) {
162 zones[i].zone_bm |= 1 << z;
169 zones[next].zone_bm = 1 << z;
170 zones[next].mas_bm = current_bmp;
174 bitmap_shift_right(tmp_bmp, tmp_bmp, UWB_MAS_PER_ZONE, UWB_NUM_MAS);
177 /* Store in format ready for transmission (le16). */
178 for (i = 0; i < num_fields; i++) {
179 drp_ie->allocs[i].zone_bm = cpu_to_le16(zones[i].zone_bm);
180 drp_ie->allocs[i].mas_bm = cpu_to_le16(zones[i].mas_bm);
183 drp_ie->hdr.length = sizeof(struct uwb_ie_drp) - sizeof(struct uwb_ie_hdr)
184 + num_fields * sizeof(struct uwb_drp_alloc);
188 * uwb_drp_ie_update - update a reservation's DRP IE
189 * @rsv: the reservation
191 int uwb_drp_ie_update(struct uwb_rsv *rsv)
193 struct uwb_ie_drp *drp_ie;
194 struct uwb_rsv_move *mv;
197 if (rsv->state == UWB_RSV_STATE_NONE) {
203 unsafe = rsv->mas.unsafe ? 1 : 0;
205 if (rsv->drp_ie == NULL) {
206 rsv->drp_ie = uwb_drp_ie_alloc();
207 if (rsv->drp_ie == NULL)
210 drp_ie = rsv->drp_ie;
212 uwb_ie_drp_set_unsafe(drp_ie, unsafe);
213 uwb_ie_drp_set_tiebreaker(drp_ie, rsv->tiebreaker);
214 uwb_ie_drp_set_owner(drp_ie, uwb_rsv_is_owner(rsv));
215 uwb_ie_drp_set_status(drp_ie, uwb_rsv_status(rsv));
216 uwb_ie_drp_set_reason_code(drp_ie, uwb_rsv_reason_code(rsv));
217 uwb_ie_drp_set_stream_index(drp_ie, rsv->stream);
218 uwb_ie_drp_set_type(drp_ie, rsv->type);
220 if (uwb_rsv_is_owner(rsv)) {
221 switch (rsv->target.type) {
222 case UWB_RSV_TARGET_DEV:
223 drp_ie->dev_addr = rsv->target.dev->dev_addr;
225 case UWB_RSV_TARGET_DEVADDR:
226 drp_ie->dev_addr = rsv->target.devaddr;
230 drp_ie->dev_addr = rsv->owner->dev_addr;
232 uwb_drp_ie_from_bm(drp_ie, &rsv->mas);
234 if (uwb_rsv_has_two_drp_ies(rsv)) {
236 if (mv->companion_drp_ie == NULL) {
237 mv->companion_drp_ie = uwb_drp_ie_alloc();
238 if (mv->companion_drp_ie == NULL)
241 drp_ie = mv->companion_drp_ie;
243 /* keep all the same configuration of the main drp_ie */
244 memcpy(drp_ie, rsv->drp_ie, sizeof(struct uwb_ie_drp));
247 /* FIXME: handle properly the unsafe bit */
248 uwb_ie_drp_set_unsafe(drp_ie, 1);
249 uwb_ie_drp_set_status(drp_ie, uwb_rsv_companion_status(rsv));
250 uwb_ie_drp_set_reason_code(drp_ie, uwb_rsv_companion_reason_code(rsv));
252 uwb_drp_ie_from_bm(drp_ie, &mv->companion_mas);
255 rsv->ie_valid = true;
260 * Set MAS bits from given MAS bitmap in a single zone of large bitmap.
262 * We are given a zone id and the MAS bitmap of bits that need to be set in
263 * this zone. Note that this zone may already have bits set and this only
264 * adds settings - we cannot simply assign the MAS bitmap contents to the
265 * zone contents. We iterate over the the bits (MAS) in the zone and set the
266 * bits that are set in the given MAS bitmap.
269 void uwb_drp_ie_single_zone_to_bm(struct uwb_mas_bm *bm, u8 zone, u16 mas_bm)
274 for (mas = 0; mas < UWB_MAS_PER_ZONE; mas++) {
276 if (mas_bm & mas_mask)
277 set_bit(zone * UWB_NUM_ZONES + mas, bm->bm);
282 * uwb_drp_ie_zones_to_bm - convert DRP allocation fields to a bitmap
283 * @mas: MAS bitmap that will be populated to correspond to the
284 * allocation fields in the DRP IE
285 * @drp_ie: the DRP IE that contains the allocation fields.
287 * The input format is an array of MAS allocation fields (16 bit Zone
288 * bitmap, 16 bit MAS bitmap) as described in [ECMA-368] section
289 * 16.8.6. The output is a full 256 bit MAS bitmap.
291 * We go over all the allocation fields, for each allocation field we
292 * know which zones are impacted. We iterate over all the zones
293 * impacted and call a function that will set the correct MAS bits in
296 void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie)
298 int numallocs = (drp_ie->hdr.length - 4) / 4;
299 const struct uwb_drp_alloc *alloc;
305 bitmap_zero(bm->bm, UWB_NUM_MAS);
307 for (cnt = 0; cnt < numallocs; cnt++) {
308 alloc = &drp_ie->allocs[cnt];
309 zone_bm = le16_to_cpu(alloc->zone_bm);
310 mas_bm = le16_to_cpu(alloc->mas_bm);
311 for (zone = 0; zone < UWB_NUM_ZONES; zone++) {
312 zone_mask = 1 << zone;
313 if (zone_bm & zone_mask)
314 uwb_drp_ie_single_zone_to_bm(bm, zone, mas_bm);