232 lines
6.4 KiB
C
232 lines
6.4 KiB
C
/*
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* UWB DRP IE management.
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Copyright (C) 2008 Cambridge Silicon Radio Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/version.h>
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#include <linux/kernel.h>
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#include <linux/random.h>
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#include <linux/uwb.h>
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#include "uwb-internal.h"
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/*
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* Allocate a DRP IE.
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*
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* To save having to free/allocate a DRP IE when its MAS changes,
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* enough memory is allocated for the maxiumum number of DRP
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* allocation fields. This gives an overhead per reservation of up to
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* (UWB_NUM_ZONES - 1) * 4 = 60 octets.
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*/
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static struct uwb_ie_drp *uwb_drp_ie_alloc(void)
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{
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struct uwb_ie_drp *drp_ie;
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unsigned tiebreaker;
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drp_ie = kzalloc(sizeof(struct uwb_ie_drp) +
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UWB_NUM_ZONES * sizeof(struct uwb_drp_alloc),
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GFP_KERNEL);
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if (drp_ie) {
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drp_ie->hdr.element_id = UWB_IE_DRP;
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get_random_bytes(&tiebreaker, sizeof(unsigned));
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uwb_ie_drp_set_tiebreaker(drp_ie, tiebreaker & 1);
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}
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return drp_ie;
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}
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/*
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* Fill a DRP IE's allocation fields from a MAS bitmap.
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*/
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static void uwb_drp_ie_from_bm(struct uwb_ie_drp *drp_ie,
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struct uwb_mas_bm *mas)
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{
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int z, i, num_fields = 0, next = 0;
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struct uwb_drp_alloc *zones;
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__le16 current_bmp;
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DECLARE_BITMAP(tmp_bmp, UWB_NUM_MAS);
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DECLARE_BITMAP(tmp_mas_bm, UWB_MAS_PER_ZONE);
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zones = drp_ie->allocs;
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bitmap_copy(tmp_bmp, mas->bm, UWB_NUM_MAS);
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/* Determine unique MAS bitmaps in zones from bitmap. */
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for (z = 0; z < UWB_NUM_ZONES; z++) {
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bitmap_copy(tmp_mas_bm, tmp_bmp, UWB_MAS_PER_ZONE);
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if (bitmap_weight(tmp_mas_bm, UWB_MAS_PER_ZONE) > 0) {
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bool found = false;
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current_bmp = (__le16) *tmp_mas_bm;
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for (i = 0; i < next; i++) {
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if (current_bmp == zones[i].mas_bm) {
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zones[i].zone_bm |= 1 << z;
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found = true;
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break;
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}
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}
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if (!found) {
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num_fields++;
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zones[next].zone_bm = 1 << z;
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zones[next].mas_bm = current_bmp;
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next++;
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}
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}
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bitmap_shift_right(tmp_bmp, tmp_bmp, UWB_MAS_PER_ZONE, UWB_NUM_MAS);
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}
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/* Store in format ready for transmission (le16). */
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for (i = 0; i < num_fields; i++) {
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drp_ie->allocs[i].zone_bm = cpu_to_le16(zones[i].zone_bm);
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drp_ie->allocs[i].mas_bm = cpu_to_le16(zones[i].mas_bm);
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}
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drp_ie->hdr.length = sizeof(struct uwb_ie_drp) - sizeof(struct uwb_ie_hdr)
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+ num_fields * sizeof(struct uwb_drp_alloc);
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}
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/**
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* uwb_drp_ie_update - update a reservation's DRP IE
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* @rsv: the reservation
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*/
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int uwb_drp_ie_update(struct uwb_rsv *rsv)
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{
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struct device *dev = &rsv->rc->uwb_dev.dev;
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struct uwb_ie_drp *drp_ie;
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int reason_code, status;
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switch (rsv->state) {
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case UWB_RSV_STATE_NONE:
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kfree(rsv->drp_ie);
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rsv->drp_ie = NULL;
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return 0;
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case UWB_RSV_STATE_O_INITIATED:
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reason_code = UWB_DRP_REASON_ACCEPTED;
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status = 0;
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break;
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case UWB_RSV_STATE_O_PENDING:
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reason_code = UWB_DRP_REASON_ACCEPTED;
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status = 0;
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break;
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case UWB_RSV_STATE_O_MODIFIED:
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reason_code = UWB_DRP_REASON_MODIFIED;
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status = 1;
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break;
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case UWB_RSV_STATE_O_ESTABLISHED:
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reason_code = UWB_DRP_REASON_ACCEPTED;
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status = 1;
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break;
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case UWB_RSV_STATE_T_ACCEPTED:
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reason_code = UWB_DRP_REASON_ACCEPTED;
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status = 1;
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break;
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case UWB_RSV_STATE_T_DENIED:
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reason_code = UWB_DRP_REASON_DENIED;
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status = 0;
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break;
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default:
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dev_dbg(dev, "rsv with unhandled state (%d)\n", rsv->state);
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return -EINVAL;
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}
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if (rsv->drp_ie == NULL) {
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rsv->drp_ie = uwb_drp_ie_alloc();
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if (rsv->drp_ie == NULL)
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return -ENOMEM;
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}
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drp_ie = rsv->drp_ie;
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uwb_ie_drp_set_owner(drp_ie, uwb_rsv_is_owner(rsv));
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uwb_ie_drp_set_status(drp_ie, status);
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uwb_ie_drp_set_reason_code(drp_ie, reason_code);
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uwb_ie_drp_set_stream_index(drp_ie, rsv->stream);
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uwb_ie_drp_set_type(drp_ie, rsv->type);
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if (uwb_rsv_is_owner(rsv)) {
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switch (rsv->target.type) {
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case UWB_RSV_TARGET_DEV:
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drp_ie->dev_addr = rsv->target.dev->dev_addr;
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break;
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case UWB_RSV_TARGET_DEVADDR:
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drp_ie->dev_addr = rsv->target.devaddr;
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break;
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}
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} else
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drp_ie->dev_addr = rsv->owner->dev_addr;
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uwb_drp_ie_from_bm(drp_ie, &rsv->mas);
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rsv->ie_valid = true;
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return 0;
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}
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/*
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* Set MAS bits from given MAS bitmap in a single zone of large bitmap.
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*
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* We are given a zone id and the MAS bitmap of bits that need to be set in
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* this zone. Note that this zone may already have bits set and this only
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* adds settings - we cannot simply assign the MAS bitmap contents to the
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* zone contents. We iterate over the the bits (MAS) in the zone and set the
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* bits that are set in the given MAS bitmap.
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*/
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static
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void uwb_drp_ie_single_zone_to_bm(struct uwb_mas_bm *bm, u8 zone, u16 mas_bm)
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{
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int mas;
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u16 mas_mask;
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for (mas = 0; mas < UWB_MAS_PER_ZONE; mas++) {
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mas_mask = 1 << mas;
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if (mas_bm & mas_mask)
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set_bit(zone * UWB_NUM_ZONES + mas, bm->bm);
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}
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}
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/**
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* uwb_drp_ie_zones_to_bm - convert DRP allocation fields to a bitmap
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* @mas: MAS bitmap that will be populated to correspond to the
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* allocation fields in the DRP IE
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* @drp_ie: the DRP IE that contains the allocation fields.
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*
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* The input format is an array of MAS allocation fields (16 bit Zone
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* bitmap, 16 bit MAS bitmap) as described in [ECMA-368] section
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* 16.8.6. The output is a full 256 bit MAS bitmap.
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*
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* We go over all the allocation fields, for each allocation field we
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* know which zones are impacted. We iterate over all the zones
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* impacted and call a function that will set the correct MAS bits in
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* each zone.
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*/
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void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie)
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{
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int numallocs = (drp_ie->hdr.length - 4) / 4;
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const struct uwb_drp_alloc *alloc;
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int cnt;
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u16 zone_bm, mas_bm;
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u8 zone;
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u16 zone_mask;
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for (cnt = 0; cnt < numallocs; cnt++) {
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alloc = &drp_ie->allocs[cnt];
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zone_bm = le16_to_cpu(alloc->zone_bm);
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mas_bm = le16_to_cpu(alloc->mas_bm);
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for (zone = 0; zone < UWB_NUM_ZONES; zone++) {
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zone_mask = 1 << zone;
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if (zone_bm & zone_mask)
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uwb_drp_ie_single_zone_to_bm(bm, zone, mas_bm);
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}
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}
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}
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