path: root/drivers/uwb/rsv.c

/*
 * 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/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]          = "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[] = {
	[UWB_DRP_TYPE_ALIEN_BP] = "alien-bp",
	[UWB_DRP_TYPE_HARD]     = "hard",
	[UWB_DRP_TYPE_SOFT]     = "soft",
	[UWB_DRP_TYPE_PRIVATE]  = "private",
	[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.
 */
const char *uwb_rsv_state_str(enum uwb_rsv_state state)
{
	if (state < UWB_RSV_STATE_NONE || state >= UWB_RSV_STATE_LAST)
		return "unknown";
	return rsv_states[state];
}
EXPORT_SYMBOL_GPL(uwb_rsv_state_str);

/**
 * uwb_rsv_type_str - return a string for a reservation type
 * @type: the reservation type
 */
const char *uwb_rsv_type_str(enum uwb_drp_type type)
{
	if (type < UWB_DRP_TYPE_ALIEN_BP || type > UWB_DRP_TYPE_PCA)
		return "invalid";
	return rsv_types[type];
}
EXPORT_SYMBOL_GPL(uwb_rsv_type_str);

void uwb_rsv_dump(char *text, struct uwb_rsv *rsv)
{
	struct device *dev = &rsv->rc->uwb_dev.dev;
	struct uwb_dev_addr devaddr;
	char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];

	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, "rsv %s %s -> %s: %s\n",
		text, owner, target, uwb_rsv_state_str(rsv->state));
}

static void uwb_rsv_release(struct kref *kref)
{
	struct uwb_rsv *rsv = container_of(kref, struct uwb_rsv, kref);

	kfree(rsv);
}

void uwb_rsv_get(struct uwb_rsv *rsv)
{
	kref_get(&rsv->kref);
}

void uwb_rsv_put(struct uwb_rsv *</