Root/drivers/uwb/drp-ie.c

1/*
2 * UWB DRP IE management.
3 *
4 * Copyright (C) 2005-2006 Intel Corporation
5 * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
6 *
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.
10 *
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.
15 *
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/>.
18 */
19#include <linux/kernel.h>
20#include <linux/random.h>
21#include <linux/slab.h>
22#include <linux/uwb.h>
23
24#include "uwb-internal.h"
25
26
27/*
28 * Return the reason code for a reservations's DRP IE.
29 */
30int uwb_rsv_reason_code(struct uwb_rsv *rsv)
31{
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,
50    };
51
52    return reason_codes[rsv->state];
53}
54
55/*
56 * Return the reason code for a reservations's companion DRP IE .
57 */
58int uwb_rsv_companion_reason_code(struct uwb_rsv *rsv)
59{
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,
66    };
67
68    return companion_reason_codes[rsv->state];
69}
70
71/*
72 * Return the status bit for a reservations's DRP IE.
73 */
74int uwb_rsv_status(struct uwb_rsv *rsv)
75{
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,
94
95    };
96
97    return statuses[rsv->state];
98}
99
100/*
101 * Return the status bit for a reservations's companion DRP IE .
102 */
103int uwb_rsv_companion_status(struct uwb_rsv *rsv)
104{
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,
111    };
112
113    return companion_statuses[rsv->state];
114}
115
116/*
117 * Allocate a DRP IE.
118 *
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.
123 */
124static struct uwb_ie_drp *uwb_drp_ie_alloc(void)
125{
126    struct uwb_ie_drp *drp_ie;
127
128    drp_ie = kzalloc(sizeof(struct uwb_ie_drp) +
129            UWB_NUM_ZONES * sizeof(struct uwb_drp_alloc),
130            GFP_KERNEL);
131    if (drp_ie) {
132        drp_ie->hdr.element_id = UWB_IE_DRP;
133    }
134    return drp_ie;
135}
136
137
138/*
139 * Fill a DRP IE's allocation fields from a MAS bitmap.
140 */
141static void uwb_drp_ie_from_bm(struct uwb_ie_drp *drp_ie,
142                   struct uwb_mas_bm *mas)
143{
144    int z, i, num_fields = 0, next = 0;
145    struct uwb_drp_alloc *zones;
146    __le16 current_bmp;
147    DECLARE_BITMAP(tmp_bmp, UWB_NUM_MAS);
148    DECLARE_BITMAP(tmp_mas_bm, UWB_MAS_PER_ZONE);
149
150    zones = drp_ie->allocs;
151
152    bitmap_copy(tmp_bmp, mas->bm, UWB_NUM_MAS);
153
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) {
158            bool found = false;
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;
163                    found = true;
164                    break;
165                }
166            }
167            if (!found) {
168                num_fields++;
169                zones[next].zone_bm = 1 << z;
170                zones[next].mas_bm = current_bmp;
171                next++;
172            }
173        }
174        bitmap_shift_right(tmp_bmp, tmp_bmp, UWB_MAS_PER_ZONE, UWB_NUM_MAS);
175    }
176
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);
181    }
182
183    drp_ie->hdr.length = sizeof(struct uwb_ie_drp) - sizeof(struct uwb_ie_hdr)
184        + num_fields * sizeof(struct uwb_drp_alloc);
185}
186
187/**
188 * uwb_drp_ie_update - update a reservation's DRP IE
189 * @rsv: the reservation
190 */
191int uwb_drp_ie_update(struct uwb_rsv *rsv)
192{
193    struct uwb_ie_drp *drp_ie;
194    struct uwb_rsv_move *mv;
195    int unsafe;
196
197    if (rsv->state == UWB_RSV_STATE_NONE) {
198        kfree(rsv->drp_ie);
199        rsv->drp_ie = NULL;
200        return 0;
201    }
202    
203    unsafe = rsv->mas.unsafe ? 1 : 0;
204
205    if (rsv->drp_ie == NULL) {
206        rsv->drp_ie = uwb_drp_ie_alloc();
207        if (rsv->drp_ie == NULL)
208            return -ENOMEM;
209    }
210    drp_ie = rsv->drp_ie;
211
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);
219
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;
224            break;
225        case UWB_RSV_TARGET_DEVADDR:
226            drp_ie->dev_addr = rsv->target.devaddr;
227            break;
228        }
229    } else
230        drp_ie->dev_addr = rsv->owner->dev_addr;
231
232    uwb_drp_ie_from_bm(drp_ie, &rsv->mas);
233
234    if (uwb_rsv_has_two_drp_ies(rsv)) {
235        mv = &rsv->mv;
236        if (mv->companion_drp_ie == NULL) {
237            mv->companion_drp_ie = uwb_drp_ie_alloc();
238            if (mv->companion_drp_ie == NULL)
239                return -ENOMEM;
240        }
241        drp_ie = mv->companion_drp_ie;
242        
243        /* keep all the same configuration of the main drp_ie */
244        memcpy(drp_ie, rsv->drp_ie, sizeof(struct uwb_ie_drp));
245        
246
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));
251    
252        uwb_drp_ie_from_bm(drp_ie, &mv->companion_mas);
253    }
254
255    rsv->ie_valid = true;
256    return 0;
257}
258
259/*
260 * Set MAS bits from given MAS bitmap in a single zone of large bitmap.
261 *
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.
267 */
268static
269void uwb_drp_ie_single_zone_to_bm(struct uwb_mas_bm *bm, u8 zone, u16 mas_bm)
270{
271    int mas;
272    u16 mas_mask;
273
274    for (mas = 0; mas < UWB_MAS_PER_ZONE; mas++) {
275        mas_mask = 1 << mas;
276        if (mas_bm & mas_mask)
277            set_bit(zone * UWB_NUM_ZONES + mas, bm->bm);
278    }
279}
280
281/**
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.
286 *
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.
290 *
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
294 * each zone.
295 */
296void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie)
297{
298    int numallocs = (drp_ie->hdr.length - 4) / 4;
299    const struct uwb_drp_alloc *alloc;
300    int cnt;
301    u16 zone_bm, mas_bm;
302    u8 zone;
303    u16 zone_mask;
304
305    bitmap_zero(bm->bm, UWB_NUM_MAS);
306
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);
315        }
316    }
317}
318
319

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