/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License, Version 1.0 only

 * (the "License").  You may not use this file except in compliance

 * with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Use is subject to license terms.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*

 * Minor number allocation for various protocol modules.

 */

#include <sys/types.h>

#include <sys/kmem.h>

#include <sys/mutex.h>

#include <sys/ddi.h>

#include <sys/types.h>

#include <sys/mkdev.h>

#include <sys/param.h>

#include <inet/common.h>

typedef struct inet_arena {

	vmem_t *ineta_arena;	/* Minor number arena */

	minor_t ineta_maxminor;	/* max minor number in the arena */

} inet_arena_t;

/* Maximum minor number to use */

static minor_t inet_maxminor = INET_MAXMINOR;

void *

inet_minor_create(char *name, dev_t min_dev, int kmflags)

{

	inet_arena_t *arena = kmem_alloc(sizeof (inet_arena_t), kmflags);

	if (arena != NULL) {

		arena->ineta_maxminor = MIN(MAXMIN32, inet_maxminor);

		arena->ineta_arena = vmem_create(name,

		    (void *)min_dev, arena->ineta_maxminor - min_dev + 1,

		    1, NULL, NULL, NULL, 1, kmflags | VMC_IDENTIFIER);

		if (arena->ineta_arena == NULL) {

			kmem_free(arena, sizeof (inet_arena_t));

			arena = NULL;

		}

	}

	return (arena);

}

void

inet_minor_destroy(void *a)

{

	inet_arena_t *arena = (inet_arena_t *)a;

	if (arena != NULL) {

		vmem_destroy(arena->ineta_arena);

		kmem_free(arena, sizeof (inet_arena_t));

	}

}

dev_t

inet_minor_alloc(void *a)

{

	inet_arena_t *arena = (inet_arena_t *)a;

	dev_t dev;

	while ((dev = (dev_t)vmem_alloc(arena->ineta_arena, 1,

		    VM_NOSLEEP)) == 0) {

		if (arena->ineta_maxminor >= inet_maxminor)

			return (0);

		if (vmem_add(arena->ineta_arena,

		    (void *)(uintptr_t)(arena->ineta_maxminor + 1),

		    inet_maxminor - arena->ineta_maxminor, VM_NOSLEEP) == NULL)

			return (0);

		arena->ineta_maxminor = inet_maxminor;

	}

	return (dev);

}

void

inet_minor_free(void *a, dev_t dev)

{

	ASSERT((dev != OPENFAIL) && (dev != 0) && (dev <= inet_maxminor));

	vmem_free(((inet_arena_t *)a)->ineta_arena, (void *)dev, 1);

}