drivers/net/ethernet/mellanox/mlx5/core/qp.c - linux/kernel/git/viro/vfs - Git at Google

 /*
  * Copyright (c) 2013, Mellanox Technologies 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/gfp.h>
 #include <linux/export.h>
 #include <linux/mlx5/cmd.h>
 #include <linux/mlx5/qp.h>
 #include <linux/mlx5/driver.h>

 #include "mlx5_core.h"

 void mlx5_qp_event(struct mlx5_core_dev *dev, u32 qpn, int event_type)
 {
 	struct mlx5_qp_table *table = &dev->priv.qp_table;
 	struct mlx5_core_qp *qp;

 	spin_lock(&table->lock);

 	qp = radix_tree_lookup(&table->tree, qpn);
 	if (qp)
 		atomic_inc(&qp->refcount);

 	spin_unlock(&table->lock);

 	if (!qp) {
 		mlx5_core_warn(dev, "Async event for bogus QP 0x%x\n", qpn);
 		return;
 	}

 	qp->event(qp, event_type);

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

 int mlx5_core_create_qp(struct mlx5_core_dev *dev,
 			struct mlx5_core_qp *qp,
 			struct mlx5_create_qp_mbox_in *in,
 			int inlen)
 {
 	struct mlx5_qp_table *table = &dev->priv.qp_table;
 	struct mlx5_create_qp_mbox_out out;
 	struct mlx5_destroy_qp_mbox_in din;
 	struct mlx5_destroy_qp_mbox_out dout;
 	int err;

 	memset(&dout, 0, sizeof(dout));
 	in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_CREATE_QP);

 	err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
 	if (err) {
 		mlx5_core_warn(dev, "ret %d", err);
 		return err;
 	}

 	if (out.hdr.status) {
 		pr_warn("current num of QPs 0x%x\n", atomic_read(&dev->num_qps));
 		return mlx5_cmd_status_to_err(&out.hdr);
 	}

 	qp->qpn = be32_to_cpu(out.qpn) & 0xffffff;
 	mlx5_core_dbg(dev, "qpn = 0x%x\n", qp->qpn);

 	spin_lock_irq(&table->lock);
 	err = radix_tree_insert(&table->tree, qp->qpn, qp);
 	spin_unlock_irq(&table->lock);
 	if (err) {
 		mlx5_core_warn(dev, "err %d", err);
 		goto err_cmd;
 	}

 	err = mlx5_debug_qp_add(dev, qp);
 	if (err)
 		mlx5_core_dbg(dev, "failed adding QP 0x%x to debug file system\n",
 			      qp->qpn);

 	qp->pid = current->pid;
 	atomic_set(&qp->refcount, 1);
 	atomic_inc(&dev->num_qps);
 	init_completion(&qp->free);

 	return 0;

 err_cmd:
 	memset(&din, 0, sizeof(din));
 	memset(&dout, 0, sizeof(dout));
 	din.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_DESTROY_QP);
 	din.qpn = cpu_to_be32(qp->qpn);
 	mlx5_cmd_exec(dev, &din, sizeof(din), &out, sizeof(dout));

 	return err;
 }
 EXPORT_SYMBOL_GPL(mlx5_core_create_qp);

 int mlx5_core_destroy_qp(struct mlx5_core_dev *dev,
 			 struct mlx5_core_qp *qp)
 {
 	struct mlx5_destroy_qp_mbox_in in;
 	struct mlx5_destroy_qp_mbox_out out;
 	struct mlx5_qp_table *table = &dev->priv.qp_table;
 	unsigned long flags;
 	int err;

 	mlx5_debug_qp_remove(dev, qp);

 	spin_lock_irqsave(&table->lock, flags);
 	radix_tree_delete(&table->tree, qp->qpn);
 	spin_unlock_irqrestore(&table->lock, flags);

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

 	memset(&in, 0, sizeof(in));
 	memset(&out, 0, sizeof(out));
 	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_DESTROY_QP);
 	in.qpn = cpu_to_be32(qp->qpn);
 	err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
 	if (err)
 		return err;

 	if (out.hdr.status)
 		return mlx5_cmd_status_to_err(&out.hdr);

 	atomic_dec(&dev->num_qps);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(mlx5_core_destroy_qp);

 int mlx5_core_qp_modify(struct mlx5_core_dev *dev, enum mlx5_qp_state cur_state,
 			enum mlx5_qp_state new_state,
 			struct mlx5_modify_qp_mbox_in *in, int sqd_event,
 			struct mlx5_core_qp *qp)
 {
 	static const u16 optab[MLX5_QP_NUM_STATE][MLX5_QP_NUM_STATE] = {
 		[MLX5_QP_STATE_RST] = {
 			[MLX5_QP_STATE_RST]	= MLX5_CMD_OP_2RST_QP,
 			[MLX5_QP_STATE_ERR]	= MLX5_CMD_OP_2ERR_QP,
 			[MLX5_QP_STATE_INIT]	= MLX5_CMD_OP_RST2INIT_QP,
 		},
 		[MLX5_QP_STATE_INIT]  = {
 			[MLX5_QP_STATE_RST]	= MLX5_CMD_OP_2RST_QP,
 			[MLX5_QP_STATE_ERR]	= MLX5_CMD_OP_2ERR_QP,
 			[MLX5_QP_STATE_INIT]	= MLX5_CMD_OP_INIT2INIT_QP,
 			[MLX5_QP_STATE_RTR]	= MLX5_CMD_OP_INIT2RTR_QP,
 		},
 		[MLX5_QP_STATE_RTR]   = {
 			[MLX5_QP_STATE_RST]	= MLX5_CMD_OP_2RST_QP,
 			[MLX5_QP_STATE_ERR]	= MLX5_CMD_OP_2ERR_QP,
 			[MLX5_QP_STATE_RTS]	= MLX5_CMD_OP_RTR2RTS_QP,
 		},
 		[MLX5_QP_STATE_RTS]   = {
 			[MLX5_QP_STATE_RST]	= MLX5_CMD_OP_2RST_QP,
 			[MLX5_QP_STATE_ERR]	= MLX5_CMD_OP_2ERR_QP,
 			[MLX5_QP_STATE_RTS]	= MLX5_CMD_OP_RTS2RTS_QP,
 			[MLX5_QP_STATE_SQD]	= MLX5_CMD_OP_RTS2SQD_QP,
 		},
 		[MLX5_QP_STATE_SQD] = {
 			[MLX5_QP_STATE_RST]	= MLX5_CMD_OP_2RST_QP,
 			[MLX5_QP_STATE_ERR]	= MLX5_CMD_OP_2ERR_QP,
 			[MLX5_QP_STATE_RTS]	= MLX5_CMD_OP_SQD2RTS_QP,
 			[MLX5_QP_STATE_SQD]	= MLX5_CMD_OP_SQD2SQD_QP,
 		},
 		[MLX5_QP_STATE_SQER] = {
 			[MLX5_QP_STATE_RST]	= MLX5_CMD_OP_2RST_QP,
 			[MLX5_QP_STATE_ERR]	= MLX5_CMD_OP_2ERR_QP,
 			[MLX5_QP_STATE_RTS]	= MLX5_CMD_OP_SQERR2RTS_QP,
 		},
 		[MLX5_QP_STATE_ERR] = {
 			[MLX5_QP_STATE_RST]	= MLX5_CMD_OP_2RST_QP,
 			[MLX5_QP_STATE_ERR]	= MLX5_CMD_OP_2ERR_QP,
 		}
 	};

 	struct mlx5_modify_qp_mbox_out out;
 	int err = 0;
 	u16 op;

 	if (cur_state >= MLX5_QP_NUM_STATE || new_state >= MLX5_QP_NUM_STATE ||
 	    !optab[cur_state][new_state])
 		return -EINVAL;

 	memset(&out, 0, sizeof(out));
 	op = optab[cur_state][new_state];
 	in->hdr.opcode = cpu_to_be16(op);
 	in->qpn = cpu_to_be32(qp->qpn);
 	err = mlx5_cmd_exec(dev, in, sizeof(*in), &out, sizeof(out));
 	if (err)
 		return err;

 	return mlx5_cmd_status_to_err(&out.hdr);
 }
 EXPORT_SYMBOL_GPL(mlx5_core_qp_modify);

 void mlx5_init_qp_table(struct mlx5_core_dev *dev)
 {
 	struct mlx5_qp_table *table = &dev->priv.qp_table;

 	spin_lock_init(&table->lock);
 	INIT_RADIX_TREE(&table->tree, GFP_ATOMIC);
 	mlx5_qp_debugfs_init(dev);
 }

 void mlx5_cleanup_qp_table(struct mlx5_core_dev *dev)
 {
 	mlx5_qp_debugfs_cleanup(dev);
 }

 int mlx5_core_qp_query(struct mlx5_core_dev *dev, struct mlx5_core_qp *qp,
 		       struct mlx5_query_qp_mbox_out *out, int outlen)
 {
 	struct mlx5_query_qp_mbox_in in;
 	int err;

 	memset(&in, 0, sizeof(in));
 	memset(out, 0, outlen);
 	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_QP);
 	in.qpn = cpu_to_be32(qp->qpn);
 	err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
 	if (err)
 		return err;

 	if (out->hdr.status)
 		return mlx5_cmd_status_to_err(&out->hdr);

 	return err;
 }
 EXPORT_SYMBOL_GPL(mlx5_core_qp_query);

 int mlx5_core_xrcd_alloc(struct mlx5_core_dev *dev, u32 *xrcdn)
 {
 	struct mlx5_alloc_xrcd_mbox_in in;
 	struct mlx5_alloc_xrcd_mbox_out out;
 	int err;

 	memset(&in, 0, sizeof(in));
 	memset(&out, 0, sizeof(out));
 	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_ALLOC_XRCD);
 	err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
 	if (err)
 		return err;

 	if (out.hdr.status)
 		err = mlx5_cmd_status_to_err(&out.hdr);
 	else
 		*xrcdn = be32_to_cpu(out.xrcdn);

 	return err;
 }
 EXPORT_SYMBOL_GPL(mlx5_core_xrcd_alloc);

 int mlx5_core_xrcd_dealloc(struct mlx5_core_dev *dev, u32 xrcdn)
 {
 	struct mlx5_dealloc_xrcd_mbox_in in;
 	struct mlx5_dealloc_xrcd_mbox_out out;
 	int err;

 	memset(&in, 0, sizeof(in));
 	memset(&out, 0, sizeof(out));
 	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_DEALLOC_XRCD);
 	in.xrcdn = cpu_to_be32(xrcdn);
 	err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
 	if (err)
 		return err;

 	if (out.hdr.status)
 		err = mlx5_cmd_status_to_err(&out.hdr);

 	return err;
 }
 EXPORT_SYMBOL_GPL(mlx5_core_xrcd_dealloc);
	/*
	* Copyright (c) 2013, Mellanox Technologies 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/gfp.h>
	#include <linux/export.h>
	#include <linux/mlx5/cmd.h>
	#include <linux/mlx5/qp.h>
	#include <linux/mlx5/driver.h>

	#include "mlx5_core.h"

	void mlx5_qp_event(struct mlx5_core_dev *dev, u32 qpn, int event_type)
	{
	struct mlx5_qp_table *table = &dev->priv.qp_table;
	struct mlx5_core_qp *qp;

	spin_lock(&table->lock);

	qp = radix_tree_lookup(&table->tree, qpn);
	if (qp)
	atomic_inc(&qp->refcount);

	spin_unlock(&table->lock);

	if (!qp) {
	mlx5_core_warn(dev, "Async event for bogus QP 0x%x\n", qpn);
	return;
	}

	qp->event(qp, event_type);

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

	int mlx5_core_create_qp(struct mlx5_core_dev *dev,
	struct mlx5_core_qp *qp,
	struct mlx5_create_qp_mbox_in *in,
	int inlen)
	{
	struct mlx5_qp_table *table = &dev->priv.qp_table;
	struct mlx5_create_qp_mbox_out out;
	struct mlx5_destroy_qp_mbox_in din;
	struct mlx5_destroy_qp_mbox_out dout;
	int err;

	memset(&dout, 0, sizeof(dout));
	in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_CREATE_QP);

	err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
	if (err) {
	mlx5_core_warn(dev, "ret %d", err);
	return err;
	}

	if (out.hdr.status) {
	pr_warn("current num of QPs 0x%x\n", atomic_read(&dev->num_qps));
	return mlx5_cmd_status_to_err(&out.hdr);
	}

	qp->qpn = be32_to_cpu(out.qpn) & 0xffffff;
	mlx5_core_dbg(dev, "qpn = 0x%x\n", qp->qpn);

	spin_lock_irq(&table->lock);
	err = radix_tree_insert(&table->tree, qp->qpn, qp);
	spin_unlock_irq(&table->lock);
	if (err) {
	mlx5_core_warn(dev, "err %d", err);
	goto err_cmd;
	}

	err = mlx5_debug_qp_add(dev, qp);
	if (err)
	mlx5_core_dbg(dev, "failed adding QP 0x%x to debug file system\n",
	qp->qpn);

	qp->pid = current->pid;
	atomic_set(&qp->refcount, 1);
	atomic_inc(&dev->num_qps);
	init_completion(&qp->free);

	return 0;

	err_cmd:
	memset(&din, 0, sizeof(din));
	memset(&dout, 0, sizeof(dout));
	din.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_DESTROY_QP);
	din.qpn = cpu_to_be32(qp->qpn);
	mlx5_cmd_exec(dev, &din, sizeof(din), &out, sizeof(dout));

	return err;
	}
	EXPORT_SYMBOL_GPL(mlx5_core_create_qp);

	int mlx5_core_destroy_qp(struct mlx5_core_dev *dev,
	struct mlx5_core_qp *qp)
	{
	struct mlx5_destroy_qp_mbox_in in;
	struct mlx5_destroy_qp_mbox_out out;
	struct mlx5_qp_table *table = &dev->priv.qp_table;
	unsigned long flags;
	int err;

	mlx5_debug_qp_remove(dev, qp);

	spin_lock_irqsave(&table->lock, flags);
	radix_tree_delete(&table->tree, qp->qpn);
	spin_unlock_irqrestore(&table->lock, flags);

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

	memset(&in, 0, sizeof(in));
	memset(&out, 0, sizeof(out));
	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_DESTROY_QP);
	in.qpn = cpu_to_be32(qp->qpn);
	err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
	if (err)
	return err;

	if (out.hdr.status)
	return mlx5_cmd_status_to_err(&out.hdr);

	atomic_dec(&dev->num_qps);
	return 0;
	}
	EXPORT_SYMBOL_GPL(mlx5_core_destroy_qp);

	int mlx5_core_qp_modify(struct mlx5_core_dev *dev, enum mlx5_qp_state cur_state,
	enum mlx5_qp_state new_state,
	struct mlx5_modify_qp_mbox_in *in, int sqd_event,
	struct mlx5_core_qp *qp)
	{
	static const u16 optab[MLX5_QP_NUM_STATE][MLX5_QP_NUM_STATE] = {
	[MLX5_QP_STATE_RST] = {
	[MLX5_QP_STATE_RST] = MLX5_CMD_OP_2RST_QP,
	[MLX5_QP_STATE_ERR] = MLX5_CMD_OP_2ERR_QP,
	[MLX5_QP_STATE_INIT] = MLX5_CMD_OP_RST2INIT_QP,
	},
	[MLX5_QP_STATE_INIT] = {
	[MLX5_QP_STATE_RST] = MLX5_CMD_OP_2RST_QP,
	[MLX5_QP_STATE_ERR] = MLX5_CMD_OP_2ERR_QP,
	[MLX5_QP_STATE_INIT] = MLX5_CMD_OP_INIT2INIT_QP,
	[MLX5_QP_STATE_RTR] = MLX5_CMD_OP_INIT2RTR_QP,
	},
	[MLX5_QP_STATE_RTR] = {
	[MLX5_QP_STATE_RST] = MLX5_CMD_OP_2RST_QP,
	[MLX5_QP_STATE_ERR] = MLX5_CMD_OP_2ERR_QP,
	[MLX5_QP_STATE_RTS] = MLX5_CMD_OP_RTR2RTS_QP,
	},
	[MLX5_QP_STATE_RTS] = {
	[MLX5_QP_STATE_RST] = MLX5_CMD_OP_2RST_QP,
	[MLX5_QP_STATE_ERR] = MLX5_CMD_OP_2ERR_QP,
	[MLX5_QP_STATE_RTS] = MLX5_CMD_OP_RTS2RTS_QP,
	[MLX5_QP_STATE_SQD] = MLX5_CMD_OP_RTS2SQD_QP,
	},
	[MLX5_QP_STATE_SQD] = {
	[MLX5_QP_STATE_RST] = MLX5_CMD_OP_2RST_QP,
	[MLX5_QP_STATE_ERR] = MLX5_CMD_OP_2ERR_QP,
	[MLX5_QP_STATE_RTS] = MLX5_CMD_OP_SQD2RTS_QP,
	[MLX5_QP_STATE_SQD] = MLX5_CMD_OP_SQD2SQD_QP,
	},
	[MLX5_QP_STATE_SQER] = {
	[MLX5_QP_STATE_RST] = MLX5_CMD_OP_2RST_QP,
	[MLX5_QP_STATE_ERR] = MLX5_CMD_OP_2ERR_QP,
	[MLX5_QP_STATE_RTS] = MLX5_CMD_OP_SQERR2RTS_QP,
	},
	[MLX5_QP_STATE_ERR] = {
	[MLX5_QP_STATE_RST] = MLX5_CMD_OP_2RST_QP,
	[MLX5_QP_STATE_ERR] = MLX5_CMD_OP_2ERR_QP,
	}
	};

	struct mlx5_modify_qp_mbox_out out;
	int err = 0;
	u16 op;

	if (cur_state >= MLX5_QP_NUM_STATE \|\| new_state >= MLX5_QP_NUM_STATE \|\|
	!optab[cur_state][new_state])
	return -EINVAL;

	memset(&out, 0, sizeof(out));
	op = optab[cur_state][new_state];
	in->hdr.opcode = cpu_to_be16(op);
	in->qpn = cpu_to_be32(qp->qpn);
	err = mlx5_cmd_exec(dev, in, sizeof(*in), &out, sizeof(out));
	if (err)
	return err;

	return mlx5_cmd_status_to_err(&out.hdr);
	}
	EXPORT_SYMBOL_GPL(mlx5_core_qp_modify);

	void mlx5_init_qp_table(struct mlx5_core_dev *dev)
	{
	struct mlx5_qp_table *table = &dev->priv.qp_table;

	spin_lock_init(&table->lock);
	INIT_RADIX_TREE(&table->tree, GFP_ATOMIC);
	mlx5_qp_debugfs_init(dev);
	}

	void mlx5_cleanup_qp_table(struct mlx5_core_dev *dev)
	{
	mlx5_qp_debugfs_cleanup(dev);
	}

	int mlx5_core_qp_query(struct mlx5_core_dev dev, struct mlx5_core_qp qp,
	struct mlx5_query_qp_mbox_out *out, int outlen)
	{
	struct mlx5_query_qp_mbox_in in;
	int err;

	memset(&in, 0, sizeof(in));
	memset(out, 0, outlen);
	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_QP);
	in.qpn = cpu_to_be32(qp->qpn);
	err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
	if (err)
	return err;

	if (out->hdr.status)
	return mlx5_cmd_status_to_err(&out->hdr);

	return err;
	}
	EXPORT_SYMBOL_GPL(mlx5_core_qp_query);

	int mlx5_core_xrcd_alloc(struct mlx5_core_dev dev, u32 xrcdn)
	{
	struct mlx5_alloc_xrcd_mbox_in in;
	struct mlx5_alloc_xrcd_mbox_out out;
	int err;

	memset(&in, 0, sizeof(in));
	memset(&out, 0, sizeof(out));
	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_ALLOC_XRCD);
	err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
	if (err)
	return err;

	if (out.hdr.status)
	err = mlx5_cmd_status_to_err(&out.hdr);
	else
	*xrcdn = be32_to_cpu(out.xrcdn);

	return err;
	}
	EXPORT_SYMBOL_GPL(mlx5_core_xrcd_alloc);

	int mlx5_core_xrcd_dealloc(struct mlx5_core_dev *dev, u32 xrcdn)
	{
	struct mlx5_dealloc_xrcd_mbox_in in;
	struct mlx5_dealloc_xrcd_mbox_out out;
	int err;

	memset(&in, 0, sizeof(in));
	memset(&out, 0, sizeof(out));
	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_DEALLOC_XRCD);
	in.xrcdn = cpu_to_be32(xrcdn);
	err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
	if (err)
	return err;

	if (out.hdr.status)
	err = mlx5_cmd_status_to_err(&out.hdr);

	return err;
	}
	EXPORT_SYMBOL_GPL(mlx5_core_xrcd_dealloc);