[mirror_ubuntu-hirsute-kernel.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/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	34	#include <linux/string.h>
225c7b1f RD	35
	36	#include <linux/mlx4/cmd.h>
	37
	38	#include "mlx4.h"
	39
521e575b RL	40	#define MGM_QPN_MASK 0x00FFFFFF
	41	#define MGM_BLCK_LB_BIT 30
	42
225c7b1f RD	43	struct mlx4_mgm {
	44	__be32 next_gid_index;
	45	__be32 members_count;
	46	u32 reserved[2];
	47	u8 gid[16];
	48	__be32 qp[MLX4_QP_PER_MGM];
	49	};
	50
	51	static const u8 zero_gid[16]; /* automatically initialized to 0 */
	52
	53	static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
	54	struct mlx4_cmd_mailbox *mailbox)
	55	{
	56	return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
	57	MLX4_CMD_TIME_CLASS_A);
	58	}
	59
	60	static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
	61	struct mlx4_cmd_mailbox *mailbox)
	62	{
	63	return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
	64	MLX4_CMD_TIME_CLASS_A);
	65	}
	66
	67	static int mlx4_MGID_HASH(struct mlx4_dev dev, struct mlx4_cmd_mailbox mailbox,
	68	u16 *hash)
	69	{
	70	u64 imm;
	71	int err;
	72
	73	err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
	74	MLX4_CMD_TIME_CLASS_A);
	75
	76	if (!err)
	77	*hash = imm;
	78
	79	return err;
	80	}
	81
	82	/*
	83	* Caller must hold MCG table semaphore. gid and mgm parameters must
	84	* be properly aligned for command interface.
	85	*
	86	* Returns 0 unless a firmware command error occurs.
	87	*
	88	* If GID is found in MGM or MGM is empty, index = hash, *prev = -1
	89	* and *mgm holds MGM entry.
	90	*
	91	* if GID is found in AMGM, index = index in AMGM, prev = index of
	92	* previous entry in hash chain and *mgm holds AMGM entry.
	93	*
	94	* If no AMGM exists for given gid, index = -1, prev = index of last
	95	* entry in hash chain and *mgm holds end of hash chain.
	96	*/
	97	static int find_mgm(struct mlx4_dev *dev,
	98	u8 gid, struct mlx4_cmd_mailbox mgm_mailbox,
	99	u16 hash, int prev, int *index)
	100	{
	101	struct mlx4_cmd_mailbox *mailbox;
	102	struct mlx4_mgm *mgm = mgm_mailbox->buf;
	103	u8 *mgid;
	104	int err;
	105
	106	mailbox = mlx4_alloc_cmd_mailbox(dev);
107	if (IS_ERR(mailbox))
108	return -ENOMEM;
109	mgid = mailbox->buf;
110
111	memcpy(mgid, gid, 16);
112
113	err = mlx4_MGID_HASH(dev, mailbox, hash);
114	mlx4_free_cmd_mailbox(dev, mailbox);
115	if (err)
116	return err;
117
118	if (0)
5b095d98	119	mlx4_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
225c7b1f RD	120
	121	index = hash;
	122	*prev = -1;
	123
	124	do {
	125	err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
	126	if (err)
	127	return err;
	128
	129	if (!memcmp(mgm->gid, zero_gid, 16)) {
	130	if (index != hash) {
	131	mlx4_err(dev, "Found zero MGID in AMGM.\n");
	132	err = -EINVAL;
	133	}
	134	return err;
	135	}
	136
	137	if (!memcmp(mgm->gid, gid, 16))
	138	return err;
	139
	140	prev = index;
	141	*index = be32_to_cpu(mgm->next_gid_index) >> 6;
	142	} while (*index);
	143
	144	*index = -1;
	145	return err;
	146	}
	147
521e575b RL	148	int mlx4_multicast_attach(struct mlx4_dev dev, struct mlx4_qp qp, u8 gid[16],
521e575b RL	149	int block_mcast_loopback)
225c7b1f RD	150	{
	151	struct mlx4_priv *priv = mlx4_priv(dev);
	152	struct mlx4_cmd_mailbox *mailbox;
	153	struct mlx4_mgm *mgm;
	154	u32 members_count;
	155	u16 hash;
	156	int index, prev;
	157	int link = 0;
	158	int i;
	159	int err;
	160
	161	mailbox = mlx4_alloc_cmd_mailbox(dev);
	162	if (IS_ERR(mailbox))
	163	return PTR_ERR(mailbox);
	164	mgm = mailbox->buf;
	165
	166	mutex_lock(&priv->mcg_table.mutex);
	167
	168	err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
	169	if (err)
	170	goto out;
	171
	172	if (index != -1) {
	173	if (!memcmp(mgm->gid, zero_gid, 16))
	174	memcpy(mgm->gid, gid, 16);
	175	} else {
	176	link = 1;
	177
	178	index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
	179	if (index == -1) {
	180	mlx4_err(dev, "No AMGM entries left\n");
	181	err = -ENOMEM;
	182	goto out;
	183	}
	184	index += dev->caps.num_mgms;
	185
225c7b1f RD	186	memset(mgm, 0, sizeof *mgm);
	187	memcpy(mgm->gid, gid, 16);
	188	}
	189
	190	members_count = be32_to_cpu(mgm->members_count);
	191	if (members_count == MLX4_QP_PER_MGM) {
	192	mlx4_err(dev, "MGM at index %x is full.\n", index);
	193	err = -ENOMEM;
	194	goto out;
	195	}
	196
	197	for (i = 0; i < members_count; ++i)
521e575b	198	if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
225c7b1f RD	199	mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
	200	err = 0;
	201	goto out;
	202	}
	203
521e575b RL	204	if (block_mcast_loopback)
521e575b RL	205	mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) \|
e6a17622	206	(1U << MGM_BLCK_LB_BIT));
521e575b RL	207	else
	208	mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
	209
225c7b1f RD	210	mgm->members_count = cpu_to_be32(members_count);
	211
	212	err = mlx4_WRITE_MCG(dev, index, mailbox);
	213	if (err)
	214	goto out;
	215
	216	if (!link)
	217	goto out;
	218
	219	err = mlx4_READ_MCG(dev, prev, mailbox);
	220	if (err)
	221	goto out;
	222
	223	mgm->next_gid_index = cpu_to_be32(index << 6);
	224
	225	err = mlx4_WRITE_MCG(dev, prev, mailbox);
	226	if (err)
	227	goto out;
	228
	229	out:
	230	if (err && link && index != -1) {
	231	if (index < dev->caps.num_mgms)
	232	mlx4_warn(dev, "Got AMGM index %d < %d",
	233	index, dev->caps.num_mgms);
	234	else
	235	mlx4_bitmap_free(&priv->mcg_table.bitmap,
	236	index - dev->caps.num_mgms);
	237	}
	238	mutex_unlock(&priv->mcg_table.mutex);
	239
	240	mlx4_free_cmd_mailbox(dev, mailbox);
	241	return err;
	242	}
	243	EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
	244
	245	int mlx4_multicast_detach(struct mlx4_dev dev, struct mlx4_qp qp, u8 gid[16])
	246	{
	247	struct mlx4_priv *priv = mlx4_priv(dev);
	248	struct mlx4_cmd_mailbox *mailbox;
	249	struct mlx4_mgm *mgm;
	250	u32 members_count;
	251	u16 hash;
	252	int prev, index;
	253	int i, loc;
	254	int err;
	255
	256	mailbox = mlx4_alloc_cmd_mailbox(dev);
	257	if (IS_ERR(mailbox))
	258	return PTR_ERR(mailbox);
	259	mgm = mailbox->buf;
	260
	261	mutex_lock(&priv->mcg_table.mutex);
	262
	263	err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
	264	if (err)
	265	goto out;
	266
	267	if (index == -1) {
5b095d98	268	mlx4_err(dev, "MGID %pI6 not found\n", gid);
225c7b1f RD	269	err = -EINVAL;
	270	goto out;
	271	}
	272
	273	members_count = be32_to_cpu(mgm->members_count);
	274	for (loc = -1, i = 0; i < members_count; ++i)
521e575b	275	if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
225c7b1f RD	276	loc = i;
	277
	278	if (loc == -1) {
	279	mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
	280	err = -EINVAL;
	281	goto out;
	282	}
	283
	284
	285	mgm->members_count = cpu_to_be32(--members_count);
	286	mgm->qp[loc] = mgm->qp[i - 1];
	287	mgm->qp[i - 1] = 0;
	288
4dc51b32 EC	289	if (i != 1) {
4dc51b32 EC	290	err = mlx4_WRITE_MCG(dev, index, mailbox);
225c7b1f	291	goto out;
4dc51b32	292	}
225c7b1f RD	293
	294	if (prev == -1) {
	295	/* Remove entry from MGM */
	296	int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
	297	if (amgm_index) {
	298	err = mlx4_READ_MCG(dev, amgm_index, mailbox);
	299	if (err)
	300	goto out;
	301	} else
	302	memset(mgm->gid, 0, 16);
	303
	304	err = mlx4_WRITE_MCG(dev, index, mailbox);
	305	if (err)
	306	goto out;
	307
	308	if (amgm_index) {
	309	if (amgm_index < dev->caps.num_mgms)
	310	mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
	311	index, amgm_index, dev->caps.num_mgms);
	312	else
	313	mlx4_bitmap_free(&priv->mcg_table.bitmap,
	314	amgm_index - dev->caps.num_mgms);
	315	}
	316	} else {
	317	/* Remove entry from AMGM */
	318	int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
	319	err = mlx4_READ_MCG(dev, prev, mailbox);
	320	if (err)
	321	goto out;
	322
	323	mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
	324
	325	err = mlx4_WRITE_MCG(dev, prev, mailbox);
	326	if (err)
	327	goto out;
	328
	329	if (index < dev->caps.num_mgms)
	330	mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
	331	prev, index, dev->caps.num_mgms);
	332	else
	333	mlx4_bitmap_free(&priv->mcg_table.bitmap,
	334	index - dev->caps.num_mgms);
	335	}
	336
	337	out:
	338	mutex_unlock(&priv->mcg_table.mutex);
	339
	340	mlx4_free_cmd_mailbox(dev, mailbox);
	341	return err;
	342	}
	343	EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
	344
3d73c288	345	int mlx4_init_mcg_table(struct mlx4_dev *dev)
225c7b1f RD	346	{
	347	struct mlx4_priv *priv = mlx4_priv(dev);
	348	int err;
	349
93fc9e1b YP	350	err = mlx4_bitmap_init(&priv->mcg_table.bitmap, dev->caps.num_amgms,
93fc9e1b YP	351	dev->caps.num_amgms - 1, 0, 0);
225c7b1f RD	352	if (err)
	353	return err;
	354
	355	mutex_init(&priv->mcg_table.mutex);
	356
	357	return 0;
	358	}
	359
	360	void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
	361	{
	362	mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
	363	}