[linux-2.6-block.git] / drivers / uwb / drp-ie.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * UWB DRP IE management.
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
 */
#include <linux/kernel.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/uwb.h>

#include "uwb-internal.h"


/*
 * Return the reason code for a reservations's DRP IE.
 */
static 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 .
 */
static 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.
 *
 * To save having to free/allocate a DRP IE when its MAS changes,
 * enough memory is allocated for the maxiumum number of DRP
 * allocation fields.  This gives an overhead per reservation of up to
 * (UWB_NUM_ZONES - 1) * 4 = 60 octets.
 */
static struct uwb_ie_drp *uwb_drp_ie_alloc(void)
{
	struct uwb_ie_drp *drp_ie;

	drp_ie = kzalloc(struct_size(drp_ie, allocs, UWB_NUM_ZONES),
			 GFP_KERNEL);
	if (drp_ie)
		drp_ie->hdr.element_id = UWB_IE_DRP;
	return drp_ie;
}


/*
 * Fill a DRP IE's allocation fields from a MAS bitmap.
 */
static void uwb_drp_ie_from_bm(struct uwb_ie_drp *drp_ie,
			       struct uwb_mas_bm *mas)
{
	int z, i, num_fields = 0, next = 0;
	struct uwb_drp_alloc *zones;
	__le16 current_bmp;
	DECLARE_BITMAP(tmp_bmp, UWB_NUM_MAS);
	DECLARE_BITMAP(tmp_mas_bm, UWB_MAS_PER_ZONE);

	zones = drp_ie->allocs;

	bitmap_copy(tmp_bmp, mas->bm, UWB_NUM_MAS);

	/* Determine unique MAS bitmaps in zones from bitmap. */
	for (z = 0; z < UWB_NUM_ZONES; z++) {
		bitmap_copy(tmp_mas_bm, tmp_bmp, UWB_MAS_PER_ZONE);
		if (bitmap_weight(tmp_mas_bm, UWB_MAS_PER_ZONE) > 0) {
			bool found = false;
			current_bmp = (__le16) *tmp_mas_bm;
			for (i = 0; i < next; i++) {
				if (current_bmp == zones[i].mas_bm) {
					zones[i].zone_bm |= 1 << z;
					found = true;
					break;
				}
			}
			if (!found)  {
				num_fields++;
				zones[next].zone_bm = 1 << z;
				zones[next].mas_bm = current_bmp;
				next++;
			}
		}
		bitmap_shift_right(tmp_bmp, tmp_bmp, UWB_MAS_PER_ZONE, UWB_NUM_MAS);
	}

	/* Store in format ready for transmission (le16). */
	for (i = 0; i < num_fields; i++) {
		drp_ie->allocs[i].zone_bm = cpu_to_le16(zones[i].zone_bm);
		drp_ie->allocs[i].mas_bm = cpu_to_le16(zones[i].mas_bm);
	}

	drp_ie->hdr.length = sizeof(struct uwb_ie_drp) - sizeof(struct uwb_ie_hdr)
		+ num_fields * sizeof(struct uwb_drp_alloc);
}

/**
 * uwb_drp_ie_update - update a reservation's DRP IE
 * @rsv: the reservation
 */
int uwb_drp_ie_update(struct uwb_rsv *rsv)
{
	struct uwb_ie_drp *drp_ie;
	struct uwb_rsv_move *mv;
	int unsafe;

	if (rsv->state == UWB_RSV_STATE_NONE) {
		kfree(rsv->drp_ie);
		rsv->drp_ie = NULL;
		return 0;
	}

	unsafe = rsv->mas.unsafe ? 1 : 0;

	if (rsv->drp_ie == NULL) {
		rsv->drp_ie = uwb_drp_ie_alloc();
		if (rsv->drp_ie == NULL)
			return -ENOMEM;
	}
	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,       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);

	if (uwb_rsv_is_owner(rsv)) {
		switch (rsv->target.type) {
		case UWB_RSV_TARGET_DEV:
			drp_ie->dev_addr = rsv->target.dev->dev_addr;
			break;
		case UWB_RSV_TARGET_DEVADDR:
			drp_ie->dev_addr = rsv->target.devaddr;
			break;
		}
	} else
		drp_ie->dev_addr = rsv->owner->dev_addr;

	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;
}

/*
 * Set MAS bits from given MAS bitmap in a single zone of large bitmap.
 *
 * We are given a zone id and the MAS bitmap of bits that need to be set in
 * this zone. Note that this zone may already have bits set and this only
 * adds settings - we cannot simply assign the MAS bitmap contents to the
 * zone contents. We iterate over the the bits (MAS) in the zone and set the
 * bits that are set in the given MAS bitmap.
 */
static
void uwb_drp_ie_single_zone_to_bm(struct uwb_mas_bm *bm, u8 zone, u16 mas_bm)
{
	int mas;
	u16 mas_mask;

	for (mas = 0; mas < UWB_MAS_PER_ZONE; mas++) {
		mas_mask = 1 << mas;
		if (mas_bm & mas_mask)
			set_bit(zone * UWB_NUM_ZONES + mas, bm->bm);
	}
}

/**
 * uwb_drp_ie_zones_to_bm - convert DRP allocation fields to a bitmap
 * @mas:    MAS bitmap that will be populated to correspond to the
 *          allocation fields in the DRP IE
 * @drp_ie: the DRP IE that contains the allocation fields.
 *
 * The input format is an array of MAS allocation fields (16 bit Zone
 * bitmap, 16 bit MAS bitmap) as described in [ECMA-368] section
 * 16.8.6. The output is a full 256 bit MAS bitmap.
 *
 * We go over all the allocation fields, for each allocation field we
 * know which zones are impacted. We iterate over all the zones
 * impacted and call a function that will set the correct MAS bits in
 * each zone.
 */
void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie)
{
	int numallocs = (drp_ie->hdr.length - 4) / 4;
	const struct uwb_drp_alloc *alloc;
	int cnt;
	u16 zone_bm, mas_bm;
	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);
		mas_bm = le16_to_cpu(alloc->mas_bm);
		for (zone = 0; zone < UWB_NUM_ZONES; zone++)   {
			zone_mask = 1 << zone;
			if (zone_bm & zone_mask)
				uwb_drp_ie_single_zone_to_bm(bm, zone, mas_bm);
		}
	}
}
Commit	Line	Data
caab277b	1	// SPDX-License-Identifier: GPL-2.0-only
8cc13a09 DV	2	/*
	3	* UWB DRP IE management.
	4	*
	5	* Copyright (C) 2005-2006 Intel Corporation
	6	* Copyright (C) 2008 Cambridge Silicon Radio Ltd.
8cc13a09	7	*/
8cc13a09 DV	8	#include <linux/kernel.h>
8cc13a09 DV	9	#include <linux/random.h>
5a0e3ad6	10	#include <linux/slab.h>
8cc13a09 DV	11	#include <linux/uwb.h>
	12
	13	#include "uwb-internal.h"
	14
5b37717a SP	15
	16	/*
	17	* Return the reason code for a reservations's DRP IE.
	18	*/
67e51ec4	19	static int uwb_rsv_reason_code(struct uwb_rsv *rsv)
5b37717a SP	20	{
	21	static const int reason_codes[] = {
	22	[UWB_RSV_STATE_O_INITIATED] = UWB_DRP_REASON_ACCEPTED,
	23	[UWB_RSV_STATE_O_PENDING] = UWB_DRP_REASON_ACCEPTED,
	24	[UWB_RSV_STATE_O_MODIFIED] = UWB_DRP_REASON_MODIFIED,
	25	[UWB_RSV_STATE_O_ESTABLISHED] = UWB_DRP_REASON_ACCEPTED,
	26	[UWB_RSV_STATE_O_TO_BE_MOVED] = UWB_DRP_REASON_ACCEPTED,
	27	[UWB_RSV_STATE_O_MOVE_COMBINING] = UWB_DRP_REASON_MODIFIED,
	28	[UWB_RSV_STATE_O_MOVE_REDUCING] = UWB_DRP_REASON_MODIFIED,
	29	[UWB_RSV_STATE_O_MOVE_EXPANDING] = UWB_DRP_REASON_ACCEPTED,
	30	[UWB_RSV_STATE_T_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
	31	[UWB_RSV_STATE_T_CONFLICT] = UWB_DRP_REASON_CONFLICT,
	32	[UWB_RSV_STATE_T_PENDING] = UWB_DRP_REASON_PENDING,
	33	[UWB_RSV_STATE_T_DENIED] = UWB_DRP_REASON_DENIED,
	34	[UWB_RSV_STATE_T_RESIZED] = UWB_DRP_REASON_ACCEPTED,
	35	[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
	36	[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = UWB_DRP_REASON_CONFLICT,
	37	[UWB_RSV_STATE_T_EXPANDING_PENDING] = UWB_DRP_REASON_PENDING,
	38	[UWB_RSV_STATE_T_EXPANDING_DENIED] = UWB_DRP_REASON_DENIED,
	39	};
	40
	41	return reason_codes[rsv->state];
	42	}
	43
	44	/*
	45	* Return the reason code for a reservations's companion DRP IE .
	46	*/
67e51ec4	47	static int uwb_rsv_companion_reason_code(struct uwb_rsv *rsv)
5b37717a SP	48	{
	49	static const int companion_reason_codes[] = {
	50	[UWB_RSV_STATE_O_MOVE_EXPANDING] = UWB_DRP_REASON_ACCEPTED,
	51	[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
	52	[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = UWB_DRP_REASON_CONFLICT,
	53	[UWB_RSV_STATE_T_EXPANDING_PENDING] = UWB_DRP_REASON_PENDING,
	54	[UWB_RSV_STATE_T_EXPANDING_DENIED] = UWB_DRP_REASON_DENIED,
	55	};
	56
	57	return companion_reason_codes[rsv->state];
	58	}
	59
	60	/*
	61	* Return the status bit for a reservations's DRP IE.
	62	*/
	63	int uwb_rsv_status(struct uwb_rsv *rsv)
	64	{
	65	static const int statuses[] = {
	66	[UWB_RSV_STATE_O_INITIATED] = 0,
	67	[UWB_RSV_STATE_O_PENDING] = 0,
	68	[UWB_RSV_STATE_O_MODIFIED] = 1,
	69	[UWB_RSV_STATE_O_ESTABLISHED] = 1,
	70	[UWB_RSV_STATE_O_TO_BE_MOVED] = 0,
	71	[UWB_RSV_STATE_O_MOVE_COMBINING] = 1,
	72	[UWB_RSV_STATE_O_MOVE_REDUCING] = 1,
	73	[UWB_RSV_STATE_O_MOVE_EXPANDING] = 1,
	74	[UWB_RSV_STATE_T_ACCEPTED] = 1,
	75	[UWB_RSV_STATE_T_CONFLICT] = 0,
	76	[UWB_RSV_STATE_T_PENDING] = 0,
	77	[UWB_RSV_STATE_T_DENIED] = 0,
	78	[UWB_RSV_STATE_T_RESIZED] = 1,
	79	[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = 1,
	80	[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = 1,
	81	[UWB_RSV_STATE_T_EXPANDING_PENDING] = 1,
	82	[UWB_RSV_STATE_T_EXPANDING_DENIED] = 1,
	83
	84	};
	85
	86	return statuses[rsv->state];
	87	}
	88
	89	/*
	90	* Return the status bit for a reservations's companion DRP IE .
	91	*/
	92	int uwb_rsv_companion_status(struct uwb_rsv *rsv)
	93	{
	94	static const int companion_statuses[] = {
	95	[UWB_RSV_STATE_O_MOVE_EXPANDING] = 0,
	96	[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = 1,
	97	[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = 0,
	98	[UWB_RSV_STATE_T_EXPANDING_PENDING] = 0,
	99	[UWB_RSV_STATE_T_EXPANDING_DENIED] = 0,
	100	};
	101
	102	return companion_statuses[rsv->state];
	103	}
	104
8cc13a09 DV	105	/*
	106	* Allocate a DRP IE.
	107	*
	108	* To save having to free/allocate a DRP IE when its MAS changes,
	109	* enough memory is allocated for the maxiumum number of DRP
	110	* allocation fields. This gives an overhead per reservation of up to
	111	* (UWB_NUM_ZONES - 1) * 4 = 60 octets.
	112	*/
	113	static struct uwb_ie_drp *uwb_drp_ie_alloc(void)
	114	{
	115	struct uwb_ie_drp *drp_ie;
8cc13a09	116
6041828f GS	117	drp_ie = kzalloc(struct_size(drp_ie, allocs, UWB_NUM_ZONES),
6041828f GS	118	GFP_KERNEL);
8206948c	119	if (drp_ie)
8cc13a09	120	drp_ie->hdr.element_id = UWB_IE_DRP;
8cc13a09 DV	121	return drp_ie;
	122	}
	123
	124
	125	/*
	126	* Fill a DRP IE's allocation fields from a MAS bitmap.
	127	*/
	128	static void uwb_drp_ie_from_bm(struct uwb_ie_drp *drp_ie,
	129	struct uwb_mas_bm *mas)
	130	{
	131	int z, i, num_fields = 0, next = 0;
	132	struct uwb_drp_alloc *zones;
	133	__le16 current_bmp;
	134	DECLARE_BITMAP(tmp_bmp, UWB_NUM_MAS);
	135	DECLARE_BITMAP(tmp_mas_bm, UWB_MAS_PER_ZONE);
	136
	137	zones = drp_ie->allocs;
	138
	139	bitmap_copy(tmp_bmp, mas->bm, UWB_NUM_MAS);
	140
	141	/* Determine unique MAS bitmaps in zones from bitmap. */
	142	for (z = 0; z < UWB_NUM_ZONES; z++) {
	143	bitmap_copy(tmp_mas_bm, tmp_bmp, UWB_MAS_PER_ZONE);
	144	if (bitmap_weight(tmp_mas_bm, UWB_MAS_PER_ZONE) > 0) {
	145	bool found = false;
	146	current_bmp = (__le16) *tmp_mas_bm;
	147	for (i = 0; i < next; i++) {
	148	if (current_bmp == zones[i].mas_bm) {
	149	zones[i].zone_bm \|= 1 << z;
	150	found = true;
	151	break;
	152	}
	153	}
	154	if (!found) {
	155	num_fields++;
	156	zones[next].zone_bm = 1 << z;
	157	zones[next].mas_bm = current_bmp;
	158	next++;
	159	}
	160	}
	161	bitmap_shift_right(tmp_bmp, tmp_bmp, UWB_MAS_PER_ZONE, UWB_NUM_MAS);
	162	}
	163
	164	/* Store in format ready for transmission (le16). */
	165	for (i = 0; i < num_fields; i++) {
	166	drp_ie->allocs[i].zone_bm = cpu_to_le16(zones[i].zone_bm);
	167	drp_ie->allocs[i].mas_bm = cpu_to_le16(zones[i].mas_bm);
	168	}
	169
	170	drp_ie->hdr.length = sizeof(struct uwb_ie_drp) - sizeof(struct uwb_ie_hdr)
	171	+ num_fields * sizeof(struct uwb_drp_alloc);
	172	}
	173
	174	/**
	175	* uwb_drp_ie_update - update a reservation's DRP IE
	176	* @rsv: the reservation
	177	*/
	178	int uwb_drp_ie_update(struct uwb_rsv *rsv)
	179	{
8cc13a09	180	struct uwb_ie_drp *drp_ie;
5b37717a SP	181	struct uwb_rsv_move *mv;
5b37717a SP	182	int unsafe;
8cc13a09	183
5b37717a	184	if (rsv->state == UWB_RSV_STATE_NONE) {
8cc13a09 DV	185	kfree(rsv->drp_ie);
	186	rsv->drp_ie = NULL;
	187	return 0;
8cc13a09	188	}
d19000b8	189
5b37717a	190	unsafe = rsv->mas.unsafe ? 1 : 0;
8cc13a09 DV	191
	192	if (rsv->drp_ie == NULL) {
	193	rsv->drp_ie = uwb_drp_ie_alloc();
	194	if (rsv->drp_ie == NULL)
	195	return -ENOMEM;
	196	}
	197	drp_ie = rsv->drp_ie;
	198
5b37717a SP	199	uwb_ie_drp_set_unsafe(drp_ie, unsafe);
5b37717a SP	200	uwb_ie_drp_set_tiebreaker(drp_ie, rsv->tiebreaker);
8cc13a09	201	uwb_ie_drp_set_owner(drp_ie, uwb_rsv_is_owner(rsv));
5b37717a SP	202	uwb_ie_drp_set_status(drp_ie, uwb_rsv_status(rsv));
5b37717a SP	203	uwb_ie_drp_set_reason_code(drp_ie, uwb_rsv_reason_code(rsv));
8cc13a09 DV	204	uwb_ie_drp_set_stream_index(drp_ie, rsv->stream);
	205	uwb_ie_drp_set_type(drp_ie, rsv->type);
	206
	207	if (uwb_rsv_is_owner(rsv)) {
	208	switch (rsv->target.type) {
	209	case UWB_RSV_TARGET_DEV:
	210	drp_ie->dev_addr = rsv->target.dev->dev_addr;
	211	break;
	212	case UWB_RSV_TARGET_DEVADDR:
	213	drp_ie->dev_addr = rsv->target.devaddr;
	214	break;
	215	}
	216	} else
	217	drp_ie->dev_addr = rsv->owner->dev_addr;
	218
	219	uwb_drp_ie_from_bm(drp_ie, &rsv->mas);
	220
5b37717a	221	if (uwb_rsv_has_two_drp_ies(rsv)) {
d19000b8	222	mv = &rsv->mv;
5b37717a SP	223	if (mv->companion_drp_ie == NULL) {
	224	mv->companion_drp_ie = uwb_drp_ie_alloc();
	225	if (mv->companion_drp_ie == NULL)
	226	return -ENOMEM;
	227	}
	228	drp_ie = mv->companion_drp_ie;
d19000b8	229
5b37717a SP	230	/* keep all the same configuration of the main drp_ie */
5b37717a SP	231	memcpy(drp_ie, rsv->drp_ie, sizeof(struct uwb_ie_drp));
d19000b8	232
5b37717a SP	233
	234	/* FIXME: handle properly the unsafe bit */
	235	uwb_ie_drp_set_unsafe(drp_ie, 1);
	236	uwb_ie_drp_set_status(drp_ie, uwb_rsv_companion_status(rsv));
	237	uwb_ie_drp_set_reason_code(drp_ie, uwb_rsv_companion_reason_code(rsv));
d19000b8	238
5b37717a SP	239	uwb_drp_ie_from_bm(drp_ie, &mv->companion_mas);
	240	}
	241
8cc13a09 DV	242	rsv->ie_valid = true;
	243	return 0;
	244	}
	245
	246	/*
	247	* Set MAS bits from given MAS bitmap in a single zone of large bitmap.
	248	*
	249	* We are given a zone id and the MAS bitmap of bits that need to be set in
	250	* this zone. Note that this zone may already have bits set and this only
	251	* adds settings - we cannot simply assign the MAS bitmap contents to the
	252	* zone contents. We iterate over the the bits (MAS) in the zone and set the
	253	* bits that are set in the given MAS bitmap.
	254	*/
	255	static
	256	void uwb_drp_ie_single_zone_to_bm(struct uwb_mas_bm *bm, u8 zone, u16 mas_bm)
	257	{
	258	int mas;
	259	u16 mas_mask;
	260
	261	for (mas = 0; mas < UWB_MAS_PER_ZONE; mas++) {
	262	mas_mask = 1 << mas;
	263	if (mas_bm & mas_mask)
	264	set_bit(zone * UWB_NUM_ZONES + mas, bm->bm);
	265	}
	266	}
	267
	268	/**
	269	* uwb_drp_ie_zones_to_bm - convert DRP allocation fields to a bitmap
	270	* @mas: MAS bitmap that will be populated to correspond to the
	271	* allocation fields in the DRP IE
	272	* @drp_ie: the DRP IE that contains the allocation fields.
	273	*
	274	* The input format is an array of MAS allocation fields (16 bit Zone
	275	* bitmap, 16 bit MAS bitmap) as described in [ECMA-368] section
	276	* 16.8.6. The output is a full 256 bit MAS bitmap.
	277	*
	278	* We go over all the allocation fields, for each allocation field we
	279	* know which zones are impacted. We iterate over all the zones
	280	* impacted and call a function that will set the correct MAS bits in
	281	* each zone.
	282	*/
	283	void uwb_drp_ie_to_bm(struct uwb_mas_bm bm, const struct uwb_ie_drp drp_ie)
	284	{
	285	int numallocs = (drp_ie->hdr.length - 4) / 4;
	286	const struct uwb_drp_alloc *alloc;
	287	int cnt;
	288	u16 zone_bm, mas_bm;
	289	u8 zone;
	290	u16 zone_mask;
	291
5b37717a SP	292	bitmap_zero(bm->bm, UWB_NUM_MAS);
5b37717a SP	293
8cc13a09 DV	294	for (cnt = 0; cnt < numallocs; cnt++) {
	295	alloc = &drp_ie->allocs[cnt];
	296	zone_bm = le16_to_cpu(alloc->zone_bm);
	297	mas_bm = le16_to_cpu(alloc->mas_bm);
	298	for (zone = 0; zone < UWB_NUM_ZONES; zone++) {
	299	zone_mask = 1 << zone;
	300	if (zone_bm & zone_mask)
	301	uwb_drp_ie_single_zone_to_bm(bm, zone, mas_bm);
	302	}
	303	}
	304	}
5b37717a	305