drivers/net/mlx4/qp.c - kernel/msm-4.19 - Gitiles

 /*
  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
  * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
  * Copyright (c) 2004 Voltaire, Inc. 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/mlx4/cmd.h>
 #include <linux/mlx4/qp.h>

 #include "mlx4.h"
 #include "icm.h"

 void mlx4_qp_event(struct mlx4_dev *dev, u32 qpn, int event_type)
 {
 	struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
 	struct mlx4_qp *qp;

 	spin_lock(&qp_table->lock);

 	qp = __mlx4_qp_lookup(dev, qpn);
 	if (qp)
 		atomic_inc(&qp->refcount);

 	spin_unlock(&qp_table->lock);

 	if (!qp) {
 		mlx4_warn(dev, "Async event for bogus QP %08x\n", qpn);
 		return;
 	}

 	qp->event(qp, event_type);

 	if (atomic_dec_and_test(&qp->refcount))
 		complete(&qp->free);
 }

 int mlx4_qp_modify(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
 		   enum mlx4_qp_state cur_state, enum mlx4_qp_state new_state,
 		   struct mlx4_qp_context *context, enum mlx4_qp_optpar optpar,
 		   int sqd_event, struct mlx4_qp *qp)
 {
 	static const u16 op[MLX4_QP_NUM_STATE][MLX4_QP_NUM_STATE] = {
 		[MLX4_QP_STATE_RST] = {
 			[MLX4_QP_STATE_RST]	= MLX4_CMD_2RST_QP,
 			[MLX4_QP_STATE_ERR]	= MLX4_CMD_2ERR_QP,
 			[MLX4_QP_STATE_INIT]	= MLX4_CMD_RST2INIT_QP,
 		},
 		[MLX4_QP_STATE_INIT]  = {
 			[MLX4_QP_STATE_RST]	= MLX4_CMD_2RST_QP,
 			[MLX4_QP_STATE_ERR]	= MLX4_CMD_2ERR_QP,
 			[MLX4_QP_STATE_INIT]	= MLX4_CMD_INIT2INIT_QP,
 			[MLX4_QP_STATE_RTR]	= MLX4_CMD_INIT2RTR_QP,
 		},
 		[MLX4_QP_STATE_RTR]   = {
 			[MLX4_QP_STATE_RST]	= MLX4_CMD_2RST_QP,
 			[MLX4_QP_STATE_ERR]	= MLX4_CMD_2ERR_QP,
 			[MLX4_QP_STATE_RTS]	= MLX4_CMD_RTR2RTS_QP,
 		},
 		[MLX4_QP_STATE_RTS]   = {
 			[MLX4_QP_STATE_RST]	= MLX4_CMD_2RST_QP,
 			[MLX4_QP_STATE_ERR]	= MLX4_CMD_2ERR_QP,
 			[MLX4_QP_STATE_RTS]	= MLX4_CMD_RTS2RTS_QP,
 			[MLX4_QP_STATE_SQD]	= MLX4_CMD_RTS2SQD_QP,
 		},
 		[MLX4_QP_STATE_SQD] = {
 			[MLX4_QP_STATE_RST]	= MLX4_CMD_2RST_QP,
 			[MLX4_QP_STATE_ERR]	= MLX4_CMD_2ERR_QP,
 			[MLX4_QP_STATE_RTS]	= MLX4_CMD_SQD2RTS_QP,
 			[MLX4_QP_STATE_SQD]	= MLX4_CMD_SQD2SQD_QP,
 		},
 		[MLX4_QP_STATE_SQER] = {
 			[MLX4_QP_STATE_RST]	= MLX4_CMD_2RST_QP,
 			[MLX4_QP_STATE_ERR]	= MLX4_CMD_2ERR_QP,
 			[MLX4_QP_STATE_RTS]	= MLX4_CMD_SQERR2RTS_QP,
 		},
 		[MLX4_QP_STATE_ERR] = {
 			[MLX4_QP_STATE_RST]	= MLX4_CMD_2RST_QP,
 			[MLX4_QP_STATE_ERR]	= MLX4_CMD_2ERR_QP,
 		}
 	};

 	struct mlx4_cmd_mailbox *mailbox;
 	int ret = 0;

 	if (cur_state >= MLX4_QP_NUM_STATE || cur_state >= MLX4_QP_NUM_STATE ||
 	    !op[cur_state][new_state])
 		return -EINVAL;

 	if (op[cur_state][new_state] == MLX4_CMD_2RST_QP)
 		return mlx4_cmd(dev, 0, qp->qpn, 2,
 				MLX4_CMD_2RST_QP, MLX4_CMD_TIME_CLASS_A);

 	mailbox = mlx4_alloc_cmd_mailbox(dev);
 	if (IS_ERR(mailbox))
 		return PTR_ERR(mailbox);

 	if (cur_state == MLX4_QP_STATE_RST && new_state == MLX4_QP_STATE_INIT) {
 		u64 mtt_addr = mlx4_mtt_addr(dev, mtt);
 		context->mtt_base_addr_h = mtt_addr >> 32;
 		context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
 		context->log_page_size   = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
 	}

 	*(__be32 *) mailbox->buf = cpu_to_be32(optpar);
 	memcpy(mailbox->buf + 8, context, sizeof *context);

 	((struct mlx4_qp_context *) (mailbox->buf + 8))->local_qpn =
 		cpu_to_be32(qp->qpn);

 	ret = mlx4_cmd(dev, mailbox->dma, qp->qpn | (!!sqd_event << 31),
 		       new_state == MLX4_QP_STATE_RST ? 2 : 0,
 		       op[cur_state][new_state], MLX4_CMD_TIME_CLASS_C);

 	mlx4_free_cmd_mailbox(dev, mailbox);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_modify);

 int mlx4_qp_alloc(struct mlx4_dev *dev, int sqpn, struct mlx4_qp *qp)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	struct mlx4_qp_table *qp_table = &priv->qp_table;
 	int err;

 	if (sqpn)
 		qp->qpn = sqpn;
 	else {
 		qp->qpn = mlx4_bitmap_alloc(&qp_table->bitmap);
 		if (qp->qpn == -1)
 			return -ENOMEM;
 	}

 	err = mlx4_table_get(dev, &qp_table->qp_table, qp->qpn);
 	if (err)
 		goto err_out;

 	err = mlx4_table_get(dev, &qp_table->auxc_table, qp->qpn);
 	if (err)
 		goto err_put_qp;

 	err = mlx4_table_get(dev, &qp_table->altc_table, qp->qpn);
 	if (err)
 		goto err_put_auxc;

 	err = mlx4_table_get(dev, &qp_table->rdmarc_table, qp->qpn);
 	if (err)
 		goto err_put_altc;

 	err = mlx4_table_get(dev, &qp_table->cmpt_table, qp->qpn);
 	if (err)
 		goto err_put_rdmarc;

 	spin_lock_irq(&qp_table->lock);
 	err = radix_tree_insert(&dev->qp_table_tree, qp->qpn & (dev->caps.num_qps - 1), qp);
 	spin_unlock_irq(&qp_table->lock);
 	if (err)
 		goto err_put_cmpt;

 	atomic_set(&qp->refcount, 1);
 	init_completion(&qp->free);

 	return 0;

 err_put_cmpt:
 	mlx4_table_put(dev, &qp_table->cmpt_table, qp->qpn);

 err_put_rdmarc:
 	mlx4_table_put(dev, &qp_table->rdmarc_table, qp->qpn);

 err_put_altc:
 	mlx4_table_put(dev, &qp_table->altc_table, qp->qpn);

 err_put_auxc:
 	mlx4_table_put(dev, &qp_table->auxc_table, qp->qpn);

 err_put_qp:
 	mlx4_table_put(dev, &qp_table->qp_table, qp->qpn);

 err_out:
 	if (!sqpn)
 		mlx4_bitmap_free(&qp_table->bitmap, qp->qpn);

 	return err;
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_alloc);

 void mlx4_qp_remove(struct mlx4_dev *dev, struct mlx4_qp *qp)
 {
 	struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
 	unsigned long flags;

 	spin_lock_irqsave(&qp_table->lock, flags);
 	radix_tree_delete(&dev->qp_table_tree, qp->qpn & (dev->caps.num_qps - 1));
 	spin_unlock_irqrestore(&qp_table->lock, flags);
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_remove);

 void mlx4_qp_free(struct mlx4_dev *dev, struct mlx4_qp *qp)
 {
 	struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;

 	if (atomic_dec_and_test(&qp->refcount))
 		complete(&qp->free);
 	wait_for_completion(&qp->free);

 	mlx4_table_put(dev, &qp_table->cmpt_table, qp->qpn);
 	mlx4_table_put(dev, &qp_table->rdmarc_table, qp->qpn);
 	mlx4_table_put(dev, &qp_table->altc_table, qp->qpn);
 	mlx4_table_put(dev, &qp_table->auxc_table, qp->qpn);
 	mlx4_table_put(dev, &qp_table->qp_table, qp->qpn);

 	if (qp->qpn >= dev->caps.sqp_start + 8)
 		mlx4_bitmap_free(&qp_table->bitmap, qp->qpn);
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_free);

 static int mlx4_CONF_SPECIAL_QP(struct mlx4_dev *dev, u32 base_qpn)
 {
 	return mlx4_cmd(dev, 0, base_qpn, 0, MLX4_CMD_CONF_SPECIAL_QP,
 			MLX4_CMD_TIME_CLASS_B);
 }

 int mlx4_init_qp_table(struct mlx4_dev *dev)
 {
 	struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
 	int err;

 	spin_lock_init(&qp_table->lock);
 	INIT_RADIX_TREE(&dev->qp_table_tree, GFP_ATOMIC);

 	/*
 	 * We reserve 2 extra QPs per port for the special QPs.  The
 	 * block of special QPs must be aligned to a multiple of 8, so
 	 * round up.
 	 */
 	dev->caps.sqp_start = ALIGN(dev->caps.reserved_qps, 8);
 	err = mlx4_bitmap_init(&qp_table->bitmap, dev->caps.num_qps,
 			       (1 << 24) - 1, dev->caps.sqp_start + 8);
 	if (err)
 		return err;

 	return mlx4_CONF_SPECIAL_QP(dev, dev->caps.sqp_start);
 }

 void mlx4_cleanup_qp_table(struct mlx4_dev *dev)
 {
 	mlx4_CONF_SPECIAL_QP(dev, 0);
 	mlx4_bitmap_cleanup(&mlx4_priv(dev)->qp_table.bitmap);
 }

 int mlx4_qp_query(struct mlx4_dev *dev, struct mlx4_qp *qp,
 		  struct mlx4_qp_context *context)
 {
 	struct mlx4_cmd_mailbox *mailbox;
 	int err;

 	mailbox = mlx4_alloc_cmd_mailbox(dev);
 	if (IS_ERR(mailbox))
 		return PTR_ERR(mailbox);

 	err = mlx4_cmd_box(dev, 0, mailbox->dma, qp->qpn, 0,
 			   MLX4_CMD_QUERY_QP, MLX4_CMD_TIME_CLASS_A);
 	if (!err)
 		memcpy(context, mailbox->buf + 8, sizeof *context);

 	mlx4_free_cmd_mailbox(dev, mailbox);
 	return err;
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_query);
	/*
	* Copyright (c) 2004 Topspin Communications. All rights reserved.
	* Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
	* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
	* Copyright (c) 2004 Voltaire, Inc. 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/mlx4/cmd.h>
	#include <linux/mlx4/qp.h>

	#include "mlx4.h"
	#include "icm.h"

	void mlx4_qp_event(struct mlx4_dev *dev, u32 qpn, int event_type)
	{
	struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
	struct mlx4_qp *qp;

	spin_lock(&qp_table->lock);

	qp = __mlx4_qp_lookup(dev, qpn);
	if (qp)
	atomic_inc(&qp->refcount);

	spin_unlock(&qp_table->lock);

	if (!qp) {
	mlx4_warn(dev, "Async event for bogus QP %08x\n", qpn);
	return;
	}

	qp->event(qp, event_type);

	if (atomic_dec_and_test(&qp->refcount))
	complete(&qp->free);
	}

	int mlx4_qp_modify(struct mlx4_dev dev, struct mlx4_mtt mtt,
	enum mlx4_qp_state cur_state, enum mlx4_qp_state new_state,
	struct mlx4_qp_context *context, enum mlx4_qp_optpar optpar,
	int sqd_event, struct mlx4_qp *qp)
	{
	static const u16 op[MLX4_QP_NUM_STATE][MLX4_QP_NUM_STATE] = {
	[MLX4_QP_STATE_RST] = {
	[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
	[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
	[MLX4_QP_STATE_INIT] = MLX4_CMD_RST2INIT_QP,
	},
	[MLX4_QP_STATE_INIT] = {
	[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
	[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
	[MLX4_QP_STATE_INIT] = MLX4_CMD_INIT2INIT_QP,
	[MLX4_QP_STATE_RTR] = MLX4_CMD_INIT2RTR_QP,
	},
	[MLX4_QP_STATE_RTR] = {
	[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
	[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
	[MLX4_QP_STATE_RTS] = MLX4_CMD_RTR2RTS_QP,
	},
	[MLX4_QP_STATE_RTS] = {
	[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
	[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
	[MLX4_QP_STATE_RTS] = MLX4_CMD_RTS2RTS_QP,
	[MLX4_QP_STATE_SQD] = MLX4_CMD_RTS2SQD_QP,
	},
	[MLX4_QP_STATE_SQD] = {
	[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
	[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
	[MLX4_QP_STATE_RTS] = MLX4_CMD_SQD2RTS_QP,
	[MLX4_QP_STATE_SQD] = MLX4_CMD_SQD2SQD_QP,
	},
	[MLX4_QP_STATE_SQER] = {
	[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
	[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
	[MLX4_QP_STATE_RTS] = MLX4_CMD_SQERR2RTS_QP,
	},
	[MLX4_QP_STATE_ERR] = {
	[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
	[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
	}
	};

	struct mlx4_cmd_mailbox *mailbox;
	int ret = 0;

	if (cur_state >= MLX4_QP_NUM_STATE \|\| cur_state >= MLX4_QP_NUM_STATE \|\|
	!op[cur_state][new_state])
	return -EINVAL;

	if (op[cur_state][new_state] == MLX4_CMD_2RST_QP)
	return mlx4_cmd(dev, 0, qp->qpn, 2,
	MLX4_CMD_2RST_QP, MLX4_CMD_TIME_CLASS_A);

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
	return PTR_ERR(mailbox);

	if (cur_state == MLX4_QP_STATE_RST && new_state == MLX4_QP_STATE_INIT) {
	u64 mtt_addr = mlx4_mtt_addr(dev, mtt);
	context->mtt_base_addr_h = mtt_addr >> 32;
	context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
	context->log_page_size = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
	}

	(__be32 ) mailbox->buf = cpu_to_be32(optpar);
	memcpy(mailbox->buf + 8, context, sizeof *context);

	((struct mlx4_qp_context *) (mailbox->buf + 8))->local_qpn =
	cpu_to_be32(qp->qpn);

	ret = mlx4_cmd(dev, mailbox->dma, qp->qpn \| (!!sqd_event << 31),
	new_state == MLX4_QP_STATE_RST ? 2 : 0,
	op[cur_state][new_state], MLX4_CMD_TIME_CLASS_C);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return ret;
	}
	EXPORT_SYMBOL_GPL(mlx4_qp_modify);

	int mlx4_qp_alloc(struct mlx4_dev dev, int sqpn, struct mlx4_qp qp)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_qp_table *qp_table = &priv->qp_table;
	int err;

	if (sqpn)
	qp->qpn = sqpn;
	else {
	qp->qpn = mlx4_bitmap_alloc(&qp_table->bitmap);
	if (qp->qpn == -1)
	return -ENOMEM;
	}

	err = mlx4_table_get(dev, &qp_table->qp_table, qp->qpn);
	if (err)
	goto err_out;

	err = mlx4_table_get(dev, &qp_table->auxc_table, qp->qpn);
	if (err)
	goto err_put_qp;

	err = mlx4_table_get(dev, &qp_table->altc_table, qp->qpn);
	if (err)
	goto err_put_auxc;

	err = mlx4_table_get(dev, &qp_table->rdmarc_table, qp->qpn);
	if (err)
	goto err_put_altc;

	err = mlx4_table_get(dev, &qp_table->cmpt_table, qp->qpn);
	if (err)
	goto err_put_rdmarc;

	spin_lock_irq(&qp_table->lock);
	err = radix_tree_insert(&dev->qp_table_tree, qp->qpn & (dev->caps.num_qps - 1), qp);
	spin_unlock_irq(&qp_table->lock);
	if (err)
	goto err_put_cmpt;

	atomic_set(&qp->refcount, 1);
	init_completion(&qp->free);

	return 0;

	err_put_cmpt:
	mlx4_table_put(dev, &qp_table->cmpt_table, qp->qpn);

	err_put_rdmarc:
	mlx4_table_put(dev, &qp_table->rdmarc_table, qp->qpn);

	err_put_altc:
	mlx4_table_put(dev, &qp_table->altc_table, qp->qpn);

	err_put_auxc:
	mlx4_table_put(dev, &qp_table->auxc_table, qp->qpn);

	err_put_qp:
	mlx4_table_put(dev, &qp_table->qp_table, qp->qpn);

	err_out:
	if (!sqpn)
	mlx4_bitmap_free(&qp_table->bitmap, qp->qpn);

	return err;
	}
	EXPORT_SYMBOL_GPL(mlx4_qp_alloc);

	void mlx4_qp_remove(struct mlx4_dev dev, struct mlx4_qp qp)
	{
	struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
	unsigned long flags;

	spin_lock_irqsave(&qp_table->lock, flags);
	radix_tree_delete(&dev->qp_table_tree, qp->qpn & (dev->caps.num_qps - 1));
	spin_unlock_irqrestore(&qp_table->lock, flags);
	}
	EXPORT_SYMBOL_GPL(mlx4_qp_remove);

	void mlx4_qp_free(struct mlx4_dev dev, struct mlx4_qp qp)
	{
	struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;

	if (atomic_dec_and_test(&qp->refcount))
	complete(&qp->free);
	wait_for_completion(&qp->free);

	mlx4_table_put(dev, &qp_table->cmpt_table, qp->qpn);
	mlx4_table_put(dev, &qp_table->rdmarc_table, qp->qpn);
	mlx4_table_put(dev, &qp_table->altc_table, qp->qpn);
	mlx4_table_put(dev, &qp_table->auxc_table, qp->qpn);
	mlx4_table_put(dev, &qp_table->qp_table, qp->qpn);

	if (qp->qpn >= dev->caps.sqp_start + 8)
	mlx4_bitmap_free(&qp_table->bitmap, qp->qpn);
	}
	EXPORT_SYMBOL_GPL(mlx4_qp_free);

	static int mlx4_CONF_SPECIAL_QP(struct mlx4_dev *dev, u32 base_qpn)
	{
	return mlx4_cmd(dev, 0, base_qpn, 0, MLX4_CMD_CONF_SPECIAL_QP,
	MLX4_CMD_TIME_CLASS_B);
	}

	int mlx4_init_qp_table(struct mlx4_dev *dev)
	{
	struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
	int err;

	spin_lock_init(&qp_table->lock);
	INIT_RADIX_TREE(&dev->qp_table_tree, GFP_ATOMIC);

	/*
	* We reserve 2 extra QPs per port for the special QPs. The
	* block of special QPs must be aligned to a multiple of 8, so
	* round up.
	*/
	dev->caps.sqp_start = ALIGN(dev->caps.reserved_qps, 8);
	err = mlx4_bitmap_init(&qp_table->bitmap, dev->caps.num_qps,
	(1 << 24) - 1, dev->caps.sqp_start + 8);
	if (err)
	return err;

	return mlx4_CONF_SPECIAL_QP(dev, dev->caps.sqp_start);
	}

	void mlx4_cleanup_qp_table(struct mlx4_dev *dev)
	{
	mlx4_CONF_SPECIAL_QP(dev, 0);
	mlx4_bitmap_cleanup(&mlx4_priv(dev)->qp_table.bitmap);
	}

	int mlx4_qp_query(struct mlx4_dev dev, struct mlx4_qp qp,
	struct mlx4_qp_context *context)
	{
	struct mlx4_cmd_mailbox *mailbox;
	int err;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
	return PTR_ERR(mailbox);

	err = mlx4_cmd_box(dev, 0, mailbox->dma, qp->qpn, 0,
	MLX4_CMD_QUERY_QP, MLX4_CMD_TIME_CLASS_A);
	if (!err)
	memcpy(context, mailbox->buf + 8, sizeof *context);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
	}
	EXPORT_SYMBOL_GPL(mlx4_qp_query);