[linux-2.6-block.git] / drivers / net / mlx4 / mcg.c

/*
 * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/string.h>
#include <linux/slab.h>

#include <linux/mlx4/cmd.h>

#include "mlx4.h"

#define MGM_QPN_MASK       0x00FFFFFF
#define MGM_BLCK_LB_BIT    30

struct mlx4_mgm {
	__be32			next_gid_index;
	__be32			members_count;
	u32			reserved[2];
	u8			gid[16];
	__be32			qp[MLX4_QP_PER_MGM];
};

static const u8 zero_gid[16];	/* automatically initialized to 0 */

static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
			 struct mlx4_cmd_mailbox *mailbox)
{
	return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
			    MLX4_CMD_TIME_CLASS_A);
}

static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
			  struct mlx4_cmd_mailbox *mailbox)
{
	return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
			MLX4_CMD_TIME_CLASS_A);
}

static int mlx4_MGID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
			  u16 *hash)
{
	u64 imm;
	int err;

	err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
			   MLX4_CMD_TIME_CLASS_A);

	if (!err)
		*hash = imm;

	return err;
}

/*
 * Caller must hold MCG table semaphore.  gid and mgm parameters must
 * be properly aligned for command interface.
 *
 *  Returns 0 unless a firmware command error occurs.
 *
 * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
 * and *mgm holds MGM entry.
 *
 * if GID is found in AMGM, *index = index in AMGM, *prev = index of
 * previous entry in hash chain and *mgm holds AMGM entry.
 *
 * If no AMGM exists for given gid, *index = -1, *prev = index of last
 * entry in hash chain and *mgm holds end of hash chain.
 */
static int find_mgm(struct mlx4_dev *dev,
		    u8 *gid, struct mlx4_cmd_mailbox *mgm_mailbox,
		    u16 *hash, int *prev, int *index)
{
	struct mlx4_cmd_mailbox *mailbox;
	struct mlx4_mgm *mgm = mgm_mailbox->buf;
	u8 *mgid;
	int err;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return -ENOMEM;
	mgid = mailbox->buf;

	memcpy(mgid, gid, 16);

	err = mlx4_MGID_HASH(dev, mailbox, hash);
	mlx4_free_cmd_mailbox(dev, mailbox);
	if (err)
		return err;

	if (0)
		mlx4_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);

	*index = *hash;
	*prev  = -1;

	do {
		err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
		if (err)
			return err;

		if (!memcmp(mgm->gid, zero_gid, 16)) {
			if (*index != *hash) {
				mlx4_err(dev, "Found zero MGID in AMGM.\n");
				err = -EINVAL;
			}
			return err;
		}

		if (!memcmp(mgm->gid, gid, 16))
			return err;

		*prev = *index;
		*index = be32_to_cpu(mgm->next_gid_index) >> 6;
	} while (*index);

	*index = -1;
	return err;
}

int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
			  int block_mcast_loopback)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_cmd_mailbox *mailbox;
	struct mlx4_mgm *mgm;
	u32 members_count;
	u16 hash;
	int index, prev;
	int link = 0;
	int i;
	int err;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	mgm = mailbox->buf;

	mutex_lock(&priv->mcg_table.mutex);

	err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
	if (err)
		goto out;

	if (index != -1) {
		if (!memcmp(mgm->gid, zero_gid, 16))
			memcpy(mgm->gid, gid, 16);
	} else {
		link = 1;

		index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
		if (index == -1) {
			mlx4_err(dev, "No AMGM entries left\n");
			err = -ENOMEM;
			goto out;
		}
		index += dev->caps.num_mgms;

		memset(mgm, 0, sizeof *mgm);
		memcpy(mgm->gid, gid, 16);
	}

	members_count = be32_to_cpu(mgm->members_count);
	if (members_count == MLX4_QP_PER_MGM) {
		mlx4_err(dev, "MGM at index %x is full.\n", index);
		err = -ENOMEM;
		goto out;
	}

	for (i = 0; i < members_count; ++i)
		if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
			mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
			err = 0;
			goto out;
		}

	if (block_mcast_loopback)
		mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) |
						       (1U << MGM_BLCK_LB_BIT));
	else
		mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);

	mgm->members_count       = cpu_to_be32(members_count);

	err = mlx4_WRITE_MCG(dev, index, mailbox);
	if (err)
		goto out;

	if (!link)
		goto out;

	err = mlx4_READ_MCG(dev, prev, mailbox);
	if (err)
		goto out;

	mgm->next_gid_index = cpu_to_be32(index << 6);

	err = mlx4_WRITE_MCG(dev, prev, mailbox);
	if (err)
		goto out;

out:
	if (err && link && index != -1) {
		if (index < dev->caps.num_mgms)
			mlx4_warn(dev, "Got AMGM index %d < %d",
				  index, dev->caps.num_mgms);
		else
			mlx4_bitmap_free(&priv->mcg_table.bitmap,
					 index - dev->caps.num_mgms);
	}
	mutex_unlock(&priv->mcg_table.mutex);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}
EXPORT_SYMBOL_GPL(mlx4_multicast_attach);

int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_cmd_mailbox *mailbox;
	struct mlx4_mgm *mgm;
	u32 members_count;
	u16 hash;
	int prev, index;
	int i, loc;
	int err;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	mgm = mailbox->buf;

	mutex_lock(&priv->mcg_table.mutex);

	err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
	if (err)
		goto out;

	if (index == -1) {
		mlx4_err(dev, "MGID %pI6 not found\n", gid);
		err = -EINVAL;
		goto out;
	}

	members_count = be32_to_cpu(mgm->members_count);
	for (loc = -1, i = 0; i < members_count; ++i)
		if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
			loc = i;

	if (loc == -1) {
		mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
		err = -EINVAL;
		goto out;
	}


	mgm->members_count = cpu_to_be32(--members_count);
	mgm->qp[loc]       = mgm->qp[i - 1];
	mgm->qp[i - 1]     = 0;

	if (i != 1) {
		err = mlx4_WRITE_MCG(dev, index, mailbox);
		goto out;
	}

	if (prev == -1) {
		/* Remove entry from MGM */
		int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
		if (amgm_index) {
			err = mlx4_READ_MCG(dev, amgm_index, mailbox);
			if (err)
				goto out;
		} else
			memset(mgm->gid, 0, 16);

		err = mlx4_WRITE_MCG(dev, index, mailbox);
		if (err)
			goto out;

		if (amgm_index) {
			if (amgm_index < dev->caps.num_mgms)
				mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
					  index, amgm_index, dev->caps.num_mgms);
			else
				mlx4_bitmap_free(&priv->mcg_table.bitmap,
						 amgm_index - dev->caps.num_mgms);
		}
	} else {
		/* Remove entry from AMGM */
		int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
		err = mlx4_READ_MCG(dev, prev, mailbox);
		if (err)
			goto out;

		mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);

		err = mlx4_WRITE_MCG(dev, prev, mailbox);
		if (err)
			goto out;

		if (index < dev->caps.num_mgms)
			mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
				  prev, index, dev->caps.num_mgms);
		else
			mlx4_bitmap_free(&priv->mcg_table.bitmap,
					 index - dev->caps.num_mgms);
	}

out:
	mutex_unlock(&priv->mcg_table.mutex);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}
EXPORT_SYMBOL_GPL(mlx4_multicast_detach);

int mlx4_init_mcg_table(struct mlx4_dev *dev)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int err;

	err = mlx4_bitmap_init(&priv->mcg_table.bitmap, dev->caps.num_amgms,
			       dev->caps.num_amgms - 1, 0, 0);
	if (err)
		return err;

	mutex_init(&priv->mcg_table.mutex);

	return 0;
}

void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
{
	mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
}
Commit	Line	Data
225c7b1f RD	1	/*
225c7b1f RD	2	* Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
51a379d0	3	* Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
225c7b1f RD	4	*
	5	* This software is available to you under a choice of one of two
	6	* licenses. You may choose to be licensed under the terms of the GNU
	7	* General Public License (GPL) Version 2, available from the file
	8	* COPYING in the main directory of this source tree, or the
	9	* OpenIB.org BSD license below:
	10	*
	11	* Redistribution and use in source and binary forms, with or
	12	* without modification, are permitted provided that the following
	13	* conditions are met:
	14	*
	15	* - Redistributions of source code must retain the above
	16	* copyright notice, this list of conditions and the following
	17	* disclaimer.
	18	*
	19	* - Redistributions in binary form must reproduce the above
	20	* copyright notice, this list of conditions and the following
	21	* disclaimer in the documentation and/or other materials
	22	* provided with the distribution.
	23	*
	24	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	25	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	26	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	27	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	28	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	29	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	30	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	31	* SOFTWARE.
	32	*/
	33
225c7b1f RD	34	#include <linux/string.h>
	35	#include <linux/slab.h>
	36
	37	#include <linux/mlx4/cmd.h>
	38
	39	#include "mlx4.h"
	40
521e575b RL	41	#define MGM_QPN_MASK 0x00FFFFFF
	42	#define MGM_BLCK_LB_BIT 30
	43
225c7b1f RD	44	struct mlx4_mgm {
	45	__be32 next_gid_index;
	46	__be32 members_count;
	47	u32 reserved[2];
	48	u8 gid[16];
	49	__be32 qp[MLX4_QP_PER_MGM];
	50	};
	51
	52	static const u8 zero_gid[16]; /* automatically initialized to 0 */
	53
	54	static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
	55	struct mlx4_cmd_mailbox *mailbox)
	56	{
	57	return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
	58	MLX4_CMD_TIME_CLASS_A);
	59	}
	60
	61	static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
	62	struct mlx4_cmd_mailbox *mailbox)
	63	{
	64	return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
	65	MLX4_CMD_TIME_CLASS_A);
	66	}
	67
	68	static int mlx4_MGID_HASH(struct mlx4_dev dev, struct mlx4_cmd_mailbox mailbox,
	69	u16 *hash)
	70	{
	71	u64 imm;
	72	int err;
	73
	74	err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
	75	MLX4_CMD_TIME_CLASS_A);
	76
	77	if (!err)
	78	*hash = imm;
	79
	80	return err;
	81	}
	82
	83	/*
	84	* Caller must hold MCG table semaphore. gid and mgm parameters must
	85	* be properly aligned for command interface.
	86	*
	87	* Returns 0 unless a firmware command error occurs.
	88	*
	89	* If GID is found in MGM or MGM is empty, index = hash, *prev = -1
	90	* and *mgm holds MGM entry.
	91	*
	92	* if GID is found in AMGM, index = index in AMGM, prev = index of
	93	* previous entry in hash chain and *mgm holds AMGM entry.
	94	*
	95	* If no AMGM exists for given gid, index = -1, prev = index of last
	96	* entry in hash chain and *mgm holds end of hash chain.
	97	*/
	98	static int find_mgm(struct mlx4_dev *dev,
	99	u8 gid, struct mlx4_cmd_mailbox mgm_mailbox,
	100	u16 hash, int prev, int *index)
	101	{
	102	struct mlx4_cmd_mailbox *mailbox;
	103	struct mlx4_mgm *mgm = mgm_mailbox->buf;
	104	u8 *mgid;
	105	int err;
	106
	107	mailbox = mlx4_alloc_cmd_mailbox(dev);
108	if (IS_ERR(mailbox))
109	return -ENOMEM;
110	mgid = mailbox->buf;
111
112	memcpy(mgid, gid, 16);
113
114	err = mlx4_MGID_HASH(dev, mailbox, hash);
115	mlx4_free_cmd_mailbox(dev, mailbox);
116	if (err)
117	return err;
118
119	if (0)
5b095d98	120	mlx4_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
225c7b1f RD	121
	122	index = hash;
	123	*prev = -1;
	124
	125	do {
	126	err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
	127	if (err)
	128	return err;
	129
	130	if (!memcmp(mgm->gid, zero_gid, 16)) {
	131	if (index != hash) {
	132	mlx4_err(dev, "Found zero MGID in AMGM.\n");
	133	err = -EINVAL;
	134	}
	135	return err;
	136	}
	137
	138	if (!memcmp(mgm->gid, gid, 16))
	139	return err;
	140
	141	prev = index;
	142	*index = be32_to_cpu(mgm->next_gid_index) >> 6;
	143	} while (*index);
	144
	145	*index = -1;
	146	return err;
	147	}
	148
521e575b RL	149	int mlx4_multicast_attach(struct mlx4_dev dev, struct mlx4_qp qp, u8 gid[16],
521e575b RL	150	int block_mcast_loopback)
225c7b1f RD	151	{
	152	struct mlx4_priv *priv = mlx4_priv(dev);
	153	struct mlx4_cmd_mailbox *mailbox;
	154	struct mlx4_mgm *mgm;
	155	u32 members_count;
	156	u16 hash;
	157	int index, prev;
	158	int link = 0;
	159	int i;
	160	int err;
	161
	162	mailbox = mlx4_alloc_cmd_mailbox(dev);
	163	if (IS_ERR(mailbox))
	164	return PTR_ERR(mailbox);
	165	mgm = mailbox->buf;
	166
	167	mutex_lock(&priv->mcg_table.mutex);
	168
	169	err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
	170	if (err)
	171	goto out;
	172
	173	if (index != -1) {
	174	if (!memcmp(mgm->gid, zero_gid, 16))
	175	memcpy(mgm->gid, gid, 16);
	176	} else {
	177	link = 1;
	178
	179	index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
	180	if (index == -1) {
	181	mlx4_err(dev, "No AMGM entries left\n");
	182	err = -ENOMEM;
	183	goto out;
	184	}
	185	index += dev->caps.num_mgms;
	186
225c7b1f RD	187	memset(mgm, 0, sizeof *mgm);
	188	memcpy(mgm->gid, gid, 16);
	189	}
	190
	191	members_count = be32_to_cpu(mgm->members_count);
	192	if (members_count == MLX4_QP_PER_MGM) {
	193	mlx4_err(dev, "MGM at index %x is full.\n", index);
	194	err = -ENOMEM;
	195	goto out;
	196	}
	197
	198	for (i = 0; i < members_count; ++i)
521e575b	199	if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
225c7b1f RD	200	mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
	201	err = 0;
	202	goto out;
	203	}
	204
521e575b RL	205	if (block_mcast_loopback)
521e575b RL	206	mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) \|
e6a17622	207	(1U << MGM_BLCK_LB_BIT));
521e575b RL	208	else
	209	mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
	210
225c7b1f RD	211	mgm->members_count = cpu_to_be32(members_count);
	212
	213	err = mlx4_WRITE_MCG(dev, index, mailbox);
	214	if (err)
	215	goto out;
	216
	217	if (!link)
	218	goto out;
	219
	220	err = mlx4_READ_MCG(dev, prev, mailbox);
	221	if (err)
	222	goto out;
	223
	224	mgm->next_gid_index = cpu_to_be32(index << 6);
	225
	226	err = mlx4_WRITE_MCG(dev, prev, mailbox);
	227	if (err)
	228	goto out;
	229
	230	out:
	231	if (err && link && index != -1) {
	232	if (index < dev->caps.num_mgms)
	233	mlx4_warn(dev, "Got AMGM index %d < %d",
	234	index, dev->caps.num_mgms);
	235	else
	236	mlx4_bitmap_free(&priv->mcg_table.bitmap,
	237	index - dev->caps.num_mgms);
	238	}
	239	mutex_unlock(&priv->mcg_table.mutex);
	240
	241	mlx4_free_cmd_mailbox(dev, mailbox);
	242	return err;
	243	}
	244	EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
	245
	246	int mlx4_multicast_detach(struct mlx4_dev dev, struct mlx4_qp qp, u8 gid[16])
	247	{
	248	struct mlx4_priv *priv = mlx4_priv(dev);
	249	struct mlx4_cmd_mailbox *mailbox;
	250	struct mlx4_mgm *mgm;
	251	u32 members_count;
	252	u16 hash;
	253	int prev, index;
	254	int i, loc;
	255	int err;
	256
	257	mailbox = mlx4_alloc_cmd_mailbox(dev);
	258	if (IS_ERR(mailbox))
	259	return PTR_ERR(mailbox);
	260	mgm = mailbox->buf;
	261
	262	mutex_lock(&priv->mcg_table.mutex);
	263
	264	err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
	265	if (err)
	266	goto out;
	267
	268	if (index == -1) {
5b095d98	269	mlx4_err(dev, "MGID %pI6 not found\n", gid);
225c7b1f RD	270	err = -EINVAL;
	271	goto out;
	272	}
	273
	274	members_count = be32_to_cpu(mgm->members_count);
	275	for (loc = -1, i = 0; i < members_count; ++i)
521e575b	276	if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
225c7b1f RD	277	loc = i;
	278
	279	if (loc == -1) {
	280	mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
	281	err = -EINVAL;
	282	goto out;
	283	}
	284
	285
	286	mgm->members_count = cpu_to_be32(--members_count);
	287	mgm->qp[loc] = mgm->qp[i - 1];
	288	mgm->qp[i - 1] = 0;
	289
4dc51b32 EC	290	if (i != 1) {
4dc51b32 EC	291	err = mlx4_WRITE_MCG(dev, index, mailbox);
225c7b1f	292	goto out;
4dc51b32	293	}
225c7b1f RD	294
	295	if (prev == -1) {
	296	/* Remove entry from MGM */
	297	int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
	298	if (amgm_index) {
	299	err = mlx4_READ_MCG(dev, amgm_index, mailbox);
	300	if (err)
	301	goto out;
	302	} else
	303	memset(mgm->gid, 0, 16);
	304
	305	err = mlx4_WRITE_MCG(dev, index, mailbox);
	306	if (err)
	307	goto out;
	308
	309	if (amgm_index) {
	310	if (amgm_index < dev->caps.num_mgms)
	311	mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
	312	index, amgm_index, dev->caps.num_mgms);
	313	else
	314	mlx4_bitmap_free(&priv->mcg_table.bitmap,
	315	amgm_index - dev->caps.num_mgms);
	316	}
	317	} else {
	318	/* Remove entry from AMGM */
	319	int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
	320	err = mlx4_READ_MCG(dev, prev, mailbox);
	321	if (err)
	322	goto out;
	323
	324	mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
	325
	326	err = mlx4_WRITE_MCG(dev, prev, mailbox);
	327	if (err)
	328	goto out;
	329
	330	if (index < dev->caps.num_mgms)
	331	mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
	332	prev, index, dev->caps.num_mgms);
	333	else
	334	mlx4_bitmap_free(&priv->mcg_table.bitmap,
	335	index - dev->caps.num_mgms);
	336	}
	337
	338	out:
	339	mutex_unlock(&priv->mcg_table.mutex);
	340
	341	mlx4_free_cmd_mailbox(dev, mailbox);
	342	return err;
	343	}
	344	EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
	345
3d73c288	346	int mlx4_init_mcg_table(struct mlx4_dev *dev)
225c7b1f RD	347	{
	348	struct mlx4_priv *priv = mlx4_priv(dev);
	349	int err;
	350
93fc9e1b YP	351	err = mlx4_bitmap_init(&priv->mcg_table.bitmap, dev->caps.num_amgms,
93fc9e1b YP	352	dev->caps.num_amgms - 1, 0, 0);
225c7b1f RD	353	if (err)
	354	return err;
	355
	356	mutex_init(&priv->mcg_table.mutex);
	357
	358	return 0;
	359	}
	360
	361	void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
	362	{
	363	mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
	364	}