[linux-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/init.h>
#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 %04x:%04x:%04x:%04x:"
			  "%04x:%04x:%04x:%04x is %04x\n",
			  be16_to_cpu(((__be16 *) gid)[0]),
			  be16_to_cpu(((__be16 *) gid)[1]),
			  be16_to_cpu(((__be16 *) gid)[2]),
			  be16_to_cpu(((__be16 *) gid)[3]),
			  be16_to_cpu(((__be16 *) gid)[4]),
			  be16_to_cpu(((__be16 *) gid)[5]),
			  be16_to_cpu(((__be16 *) gid)[6]),
			  be16_to_cpu(((__be16 *) gid)[7]),
			  *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) |
						       (1 << 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 %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
			  "not found\n",
			  be16_to_cpu(((__be16 *) gid)[0]),
			  be16_to_cpu(((__be16 *) gid)[1]),
			  be16_to_cpu(((__be16 *) gid)[2]),
			  be16_to_cpu(((__be16 *) gid)[3]),
			  be16_to_cpu(((__be16 *) gid)[4]),
			  be16_to_cpu(((__be16 *) gid)[5]),
			  be16_to_cpu(((__be16 *) gid)[6]),
			  be16_to_cpu(((__be16 *) gid)[7]));
		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);
	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
	34	#include <linux/init.h>
	35	#include <linux/string.h>
	36	#include <linux/slab.h>
	37
	38	#include <linux/mlx4/cmd.h>
	39
	40	#include "mlx4.h"
	41
521e575b RL	42	#define MGM_QPN_MASK 0x00FFFFFF
	43	#define MGM_BLCK_LB_BIT 30
	44
225c7b1f RD	45	struct mlx4_mgm {
	46	__be32 next_gid_index;
	47	__be32 members_count;
	48	u32 reserved[2];
	49	u8 gid[16];
	50	__be32 qp[MLX4_QP_PER_MGM];
	51	};
	52
	53	static const u8 zero_gid[16]; /* automatically initialized to 0 */
	54
	55	static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
	56	struct mlx4_cmd_mailbox *mailbox)
	57	{
	58	return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
	59	MLX4_CMD_TIME_CLASS_A);
	60	}
	61
	62	static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
	63	struct mlx4_cmd_mailbox *mailbox)
	64	{
	65	return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
	66	MLX4_CMD_TIME_CLASS_A);
	67	}
	68
	69	static int mlx4_MGID_HASH(struct mlx4_dev dev, struct mlx4_cmd_mailbox mailbox,
	70	u16 *hash)
	71	{
	72	u64 imm;
	73	int err;
	74
	75	err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
	76	MLX4_CMD_TIME_CLASS_A);
	77
	78	if (!err)
	79	*hash = imm;
	80
	81	return err;
	82	}
	83
	84	/*
	85	* Caller must hold MCG table semaphore. gid and mgm parameters must
	86	* be properly aligned for command interface.
	87	*
	88	* Returns 0 unless a firmware command error occurs.
	89	*
	90	* If GID is found in MGM or MGM is empty, index = hash, *prev = -1
	91	* and *mgm holds MGM entry.
	92	*
	93	* if GID is found in AMGM, index = index in AMGM, prev = index of
	94	* previous entry in hash chain and *mgm holds AMGM entry.
	95	*
	96	* If no AMGM exists for given gid, index = -1, prev = index of last
	97	* entry in hash chain and *mgm holds end of hash chain.
	98	*/
	99	static int find_mgm(struct mlx4_dev *dev,
	100	u8 gid, struct mlx4_cmd_mailbox mgm_mailbox,
	101	u16 hash, int prev, int *index)
	102	{
	103	struct mlx4_cmd_mailbox *mailbox;
	104	struct mlx4_mgm *mgm = mgm_mailbox->buf;
	105	u8 *mgid;
	106	int err;
	107
	108	mailbox = mlx4_alloc_cmd_mailbox(dev);
109	if (IS_ERR(mailbox))
110	return -ENOMEM;
111	mgid = mailbox->buf;
112
113	memcpy(mgid, gid, 16);
114
115	err = mlx4_MGID_HASH(dev, mailbox, hash);
116	mlx4_free_cmd_mailbox(dev, mailbox);
117	if (err)
118	return err;
119
120	if (0)
121	mlx4_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
122	"%04x:%04x:%04x:%04x is %04x\n",
123	be16_to_cpu(((__be16 *) gid)[0]),
124	be16_to_cpu(((__be16 *) gid)[1]),
125	be16_to_cpu(((__be16 *) gid)[2]),
126	be16_to_cpu(((__be16 *) gid)[3]),
127	be16_to_cpu(((__be16 *) gid)[4]),
128	be16_to_cpu(((__be16 *) gid)[5]),
129	be16_to_cpu(((__be16 *) gid)[6]),
130	be16_to_cpu(((__be16 *) gid)[7]),
131	*hash);
132
133	index = hash;
134	*prev = -1;
135
136	do {
137	err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
138	if (err)
139	return err;
140
141	if (!memcmp(mgm->gid, zero_gid, 16)) {
142	if (index != hash) {
143	mlx4_err(dev, "Found zero MGID in AMGM.\n");
144	err = -EINVAL;
145	}
146	return err;
147	}
148
149	if (!memcmp(mgm->gid, gid, 16))
150	return err;
151
152	prev = index;
153	*index = be32_to_cpu(mgm->next_gid_index) >> 6;
154	} while (*index);
155
156	*index = -1;
157	return err;
158	}
159
521e575b RL	160	int mlx4_multicast_attach(struct mlx4_dev dev, struct mlx4_qp qp, u8 gid[16],
521e575b RL	161	int block_mcast_loopback)
225c7b1f RD	162	{
	163	struct mlx4_priv *priv = mlx4_priv(dev);
	164	struct mlx4_cmd_mailbox *mailbox;
	165	struct mlx4_mgm *mgm;
	166	u32 members_count;
	167	u16 hash;
	168	int index, prev;
	169	int link = 0;
	170	int i;
	171	int err;
	172
	173	mailbox = mlx4_alloc_cmd_mailbox(dev);
	174	if (IS_ERR(mailbox))
	175	return PTR_ERR(mailbox);
	176	mgm = mailbox->buf;
	177
	178	mutex_lock(&priv->mcg_table.mutex);
	179
	180	err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
	181	if (err)
	182	goto out;
	183
	184	if (index != -1) {
	185	if (!memcmp(mgm->gid, zero_gid, 16))
	186	memcpy(mgm->gid, gid, 16);
	187	} else {
	188	link = 1;
	189
	190	index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
	191	if (index == -1) {
	192	mlx4_err(dev, "No AMGM entries left\n");
	193	err = -ENOMEM;
	194	goto out;
	195	}
	196	index += dev->caps.num_mgms;
	197
225c7b1f RD	198	memset(mgm, 0, sizeof *mgm);
	199	memcpy(mgm->gid, gid, 16);
	200	}
	201
	202	members_count = be32_to_cpu(mgm->members_count);
	203	if (members_count == MLX4_QP_PER_MGM) {
	204	mlx4_err(dev, "MGM at index %x is full.\n", index);
	205	err = -ENOMEM;
	206	goto out;
	207	}
	208
	209	for (i = 0; i < members_count; ++i)
521e575b	210	if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
225c7b1f RD	211	mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
	212	err = 0;
	213	goto out;
	214	}
	215
521e575b RL	216	if (block_mcast_loopback)
	217	mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) \|
	218	(1 << MGM_BLCK_LB_BIT));
	219	else
	220	mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
	221
225c7b1f RD	222	mgm->members_count = cpu_to_be32(members_count);
	223
	224	err = mlx4_WRITE_MCG(dev, index, mailbox);
	225	if (err)
	226	goto out;
	227
	228	if (!link)
	229	goto out;
	230
	231	err = mlx4_READ_MCG(dev, prev, mailbox);
	232	if (err)
	233	goto out;
	234
	235	mgm->next_gid_index = cpu_to_be32(index << 6);
	236
	237	err = mlx4_WRITE_MCG(dev, prev, mailbox);
	238	if (err)
	239	goto out;
	240
	241	out:
	242	if (err && link && index != -1) {
	243	if (index < dev->caps.num_mgms)
	244	mlx4_warn(dev, "Got AMGM index %d < %d",
	245	index, dev->caps.num_mgms);
	246	else
	247	mlx4_bitmap_free(&priv->mcg_table.bitmap,
	248	index - dev->caps.num_mgms);
	249	}
	250	mutex_unlock(&priv->mcg_table.mutex);
	251
	252	mlx4_free_cmd_mailbox(dev, mailbox);
	253	return err;
	254	}
	255	EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
	256
	257	int mlx4_multicast_detach(struct mlx4_dev dev, struct mlx4_qp qp, u8 gid[16])
	258	{
	259	struct mlx4_priv *priv = mlx4_priv(dev);
	260	struct mlx4_cmd_mailbox *mailbox;
	261	struct mlx4_mgm *mgm;
	262	u32 members_count;
	263	u16 hash;
	264	int prev, index;
	265	int i, loc;
	266	int err;
	267
	268	mailbox = mlx4_alloc_cmd_mailbox(dev);
	269	if (IS_ERR(mailbox))
	270	return PTR_ERR(mailbox);
	271	mgm = mailbox->buf;
	272
	273	mutex_lock(&priv->mcg_table.mutex);
	274
	275	err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
	276	if (err)
	277	goto out;
	278
	279	if (index == -1) {
	280	mlx4_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
	281	"not found\n",
	282	be16_to_cpu(((__be16 *) gid)[0]),
	283	be16_to_cpu(((__be16 *) gid)[1]),
	284	be16_to_cpu(((__be16 *) gid)[2]),
	285	be16_to_cpu(((__be16 *) gid)[3]),
286	be16_to_cpu(((__be16 *) gid)[4]),
287	be16_to_cpu(((__be16 *) gid)[5]),
288	be16_to_cpu(((__be16 *) gid)[6]),
289	be16_to_cpu(((__be16 *) gid)[7]));
290	err = -EINVAL;
291	goto out;
292	}
293
294	members_count = be32_to_cpu(mgm->members_count);
295	for (loc = -1, i = 0; i < members_count; ++i)
521e575b	296	if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
225c7b1f RD	297	loc = i;
	298
	299	if (loc == -1) {
	300	mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
	301	err = -EINVAL;
	302	goto out;
	303	}
	304
	305
	306	mgm->members_count = cpu_to_be32(--members_count);
	307	mgm->qp[loc] = mgm->qp[i - 1];
	308	mgm->qp[i - 1] = 0;
	309
4dc51b32 EC	310	if (i != 1) {
4dc51b32 EC	311	err = mlx4_WRITE_MCG(dev, index, mailbox);
225c7b1f	312	goto out;
4dc51b32	313	}
225c7b1f RD	314
	315	if (prev == -1) {
	316	/* Remove entry from MGM */
	317	int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
	318	if (amgm_index) {
	319	err = mlx4_READ_MCG(dev, amgm_index, mailbox);
	320	if (err)
	321	goto out;
	322	} else
	323	memset(mgm->gid, 0, 16);
	324
	325	err = mlx4_WRITE_MCG(dev, index, mailbox);
	326	if (err)
	327	goto out;
	328
	329	if (amgm_index) {
	330	if (amgm_index < dev->caps.num_mgms)
	331	mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
	332	index, amgm_index, dev->caps.num_mgms);
	333	else
	334	mlx4_bitmap_free(&priv->mcg_table.bitmap,
	335	amgm_index - dev->caps.num_mgms);
	336	}
	337	} else {
	338	/* Remove entry from AMGM */
	339	int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
	340	err = mlx4_READ_MCG(dev, prev, mailbox);
	341	if (err)
	342	goto out;
	343
	344	mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
	345
	346	err = mlx4_WRITE_MCG(dev, prev, mailbox);
	347	if (err)
	348	goto out;
	349
	350	if (index < dev->caps.num_mgms)
	351	mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
	352	prev, index, dev->caps.num_mgms);
	353	else
	354	mlx4_bitmap_free(&priv->mcg_table.bitmap,
	355	index - dev->caps.num_mgms);
	356	}
	357
	358	out:
	359	mutex_unlock(&priv->mcg_table.mutex);
	360
	361	mlx4_free_cmd_mailbox(dev, mailbox);
	362	return err;
	363	}
	364	EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
	365
3d73c288	366	int mlx4_init_mcg_table(struct mlx4_dev *dev)
225c7b1f RD	367	{
	368	struct mlx4_priv *priv = mlx4_priv(dev);
	369	int err;
	370
	371	err = mlx4_bitmap_init(&priv->mcg_table.bitmap,
	372	dev->caps.num_amgms, dev->caps.num_amgms - 1, 0);
	373	if (err)
	374	return err;
	375
	376	mutex_init(&priv->mcg_table.mutex);
	377
	378	return 0;
	379	}
	380
	381	void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
	382	{
	383	mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
	384	}