drivers/net/ethernet/mellanox/mlx4/qp.c - arm/linux-arm-legacy - Git at Google

 /*
  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
  * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
  * Copyright (c) 2005, 2006, 2007, 2008 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/gfp.h>
 #include <linux/export.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_dbg(dev, "Async event for none existent QP %08x\n", qpn);
 		return;
 	}

 	qp->event(qp, event_type);

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

 /* used for INIT/CLOSE port logic */
 static int is_master_qp0(struct mlx4_dev *dev, struct mlx4_qp *qp, int *real_qp0, int *proxy_qp0)
 {
 	/* this procedure is called after we already know we are on the master */
 	/* qp0 is either the proxy qp0, or the real qp0 */
 	u32 pf_proxy_offset = dev->phys_caps.base_proxy_sqpn + 8 * mlx4_master_func_num(dev);
 	*proxy_qp0 = qp->qpn >= pf_proxy_offset && qp->qpn <= pf_proxy_offset + 1;

 	*real_qp0 = qp->qpn >= dev->phys_caps.base_sqpn &&
 		qp->qpn <= dev->phys_caps.base_sqpn + 1;

 	return *real_qp0 || *proxy_qp0;
 }

 static 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, int native)
 {
 	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_priv *priv = mlx4_priv(dev);
 	struct mlx4_cmd_mailbox *mailbox;
 	int ret = 0;
 	int real_qp0 = 0;
 	int proxy_qp0 = 0;
 	u8 port;

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

 	if (op[cur_state][new_state] == MLX4_CMD_2RST_QP) {
 		ret = mlx4_cmd(dev, 0, qp->qpn, 2,
 			MLX4_CMD_2RST_QP, MLX4_CMD_TIME_CLASS_A, native);
 		if (mlx4_is_master(dev) && cur_state != MLX4_QP_STATE_ERR &&
 		    cur_state != MLX4_QP_STATE_RST &&
 		    is_master_qp0(dev, qp, &real_qp0, &proxy_qp0)) {
 			port = (qp->qpn & 1) + 1;
 			if (proxy_qp0)
 				priv->mfunc.master.qp0_state[port].proxy_qp0_active = 0;
 			else
 				priv->mfunc.master.qp0_state[port].qp0_active = 0;
 		}
 		return ret;
 	}

 	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, native);

 	if (mlx4_is_master(dev) && is_master_qp0(dev, qp, &real_qp0, &proxy_qp0)) {
 		port = (qp->qpn & 1) + 1;
 		if (cur_state != MLX4_QP_STATE_ERR &&
 		    cur_state != MLX4_QP_STATE_RST &&
 		    new_state == MLX4_QP_STATE_ERR) {
 			if (proxy_qp0)
 				priv->mfunc.master.qp0_state[port].proxy_qp0_active = 0;
 			else
 				priv->mfunc.master.qp0_state[port].qp0_active = 0;
 		} else if (new_state == MLX4_QP_STATE_RTR) {
 			if (proxy_qp0)
 				priv->mfunc.master.qp0_state[port].proxy_qp0_active = 1;
 			else
 				priv->mfunc.master.qp0_state[port].qp0_active = 1;
 		}
 	}

 	mlx4_free_cmd_mailbox(dev, mailbox);
 	return ret;
 }

 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)
 {
 	return __mlx4_qp_modify(dev, mtt, cur_state, new_state, context,
 				optpar, sqd_event, qp, 0);
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_modify);

 int __mlx4_qp_reserve_range(struct mlx4_dev *dev, int cnt, int align,
 				   int *base)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	struct mlx4_qp_table *qp_table = &priv->qp_table;

 	*base = mlx4_bitmap_alloc_range(&qp_table->bitmap, cnt, align);
 	if (*base == -1)
 		return -ENOMEM;

 	return 0;
 }

 int mlx4_qp_reserve_range(struct mlx4_dev *dev, int cnt, int align, int *base)
 {
 	u64 in_param = 0;
 	u64 out_param;
 	int err;

 	if (mlx4_is_mfunc(dev)) {
 		set_param_l(&in_param, cnt);
 		set_param_h(&in_param, align);
 		err = mlx4_cmd_imm(dev, in_param, &out_param,
 				   RES_QP, RES_OP_RESERVE,
 				   MLX4_CMD_ALLOC_RES,
 				   MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
 		if (err)
 			return err;

 		*base = get_param_l(&out_param);
 		return 0;
 	}
 	return __mlx4_qp_reserve_range(dev, cnt, align, base);
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_reserve_range);

 void __mlx4_qp_release_range(struct mlx4_dev *dev, int base_qpn, int cnt)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	struct mlx4_qp_table *qp_table = &priv->qp_table;

 	if (mlx4_is_qp_reserved(dev, (u32) base_qpn))
 		return;
 	mlx4_bitmap_free_range(&qp_table->bitmap, base_qpn, cnt, MLX4_USE_RR);
 }

 void mlx4_qp_release_range(struct mlx4_dev *dev, int base_qpn, int cnt)
 {
 	u64 in_param = 0;
 	int err;

 	if (mlx4_is_mfunc(dev)) {
 		set_param_l(&in_param, base_qpn);
 		set_param_h(&in_param, cnt);
 		err = mlx4_cmd(dev, in_param, RES_QP, RES_OP_RESERVE,
 			       MLX4_CMD_FREE_RES,
 			       MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
 		if (err) {
 			mlx4_warn(dev, "Failed to release qp range"
 				  " base:%d cnt:%d\n", base_qpn, cnt);
 		}
 	} else
 		 __mlx4_qp_release_range(dev, base_qpn, cnt);
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_release_range);

 int __mlx4_qp_alloc_icm(struct mlx4_dev *dev, int qpn)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	struct mlx4_qp_table *qp_table = &priv->qp_table;
 	int err;

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

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

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

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

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

 	return 0;

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

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

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

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

 err_out:
 	return err;
 }

 static int mlx4_qp_alloc_icm(struct mlx4_dev *dev, int qpn)
 {
 	u64 param = 0;

 	if (mlx4_is_mfunc(dev)) {
 		set_param_l(&param, qpn);
 		return mlx4_cmd_imm(dev, param, &param, RES_QP, RES_OP_MAP_ICM,
 				    MLX4_CMD_ALLOC_RES, MLX4_CMD_TIME_CLASS_A,
 				    MLX4_CMD_WRAPPED);
 	}
 	return __mlx4_qp_alloc_icm(dev, qpn);
 }

 void __mlx4_qp_free_icm(struct mlx4_dev *dev, int qpn)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	struct mlx4_qp_table *qp_table = &priv->qp_table;

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

 static void mlx4_qp_free_icm(struct mlx4_dev *dev, int qpn)
 {
 	u64 in_param = 0;

 	if (mlx4_is_mfunc(dev)) {
 		set_param_l(&in_param, qpn);
 		if (mlx4_cmd(dev, in_param, RES_QP, RES_OP_MAP_ICM,
 			     MLX4_CMD_FREE_RES, MLX4_CMD_TIME_CLASS_A,
 			     MLX4_CMD_WRAPPED))
 			mlx4_warn(dev, "Failed to free icm of qp:%d\n", qpn);
 	} else
 		__mlx4_qp_free_icm(dev, qpn);
 }

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

 	if (!qpn)
 		return -EINVAL;

 	qp->qpn = qpn;

 	err = mlx4_qp_alloc_icm(dev, qpn);
 	if (err)
 		return err;

 	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_icm;

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

 	return 0;

 err_icm:
 	mlx4_qp_free_icm(dev, 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)
 {
 	if (atomic_dec_and_test(&qp->refcount))
 		complete(&qp->free);
 	wait_for_completion(&qp->free);

 	mlx4_qp_free_icm(dev, 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, MLX4_CMD_NATIVE);
 }

 int mlx4_init_qp_table(struct mlx4_dev *dev)
 {
 	struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
 	int err;
 	int reserved_from_top = 0;
 	int k;

 	spin_lock_init(&qp_table->lock);
 	INIT_RADIX_TREE(&dev->qp_table_tree, GFP_ATOMIC);
 	if (mlx4_is_slave(dev))
 		return 0;

 	/*
 	 * 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.
 	 *
 	 * We also reserve the MSB of the 24-bit QP number to indicate
 	 * that a QP is an XRC QP.
 	 */
 	dev->phys_caps.base_sqpn =
 		ALIGN(dev->caps.reserved_qps_cnt[MLX4_QP_REGION_FW], 8);

 	{
 		int sort[MLX4_NUM_QP_REGION];
 		int i, j, tmp;
 		int last_base = dev->caps.num_qps;

 		for (i = 1; i < MLX4_NUM_QP_REGION; ++i)
 			sort[i] = i;

 		for (i = MLX4_NUM_QP_REGION; i > 0; --i) {
 			for (j = 2; j < i; ++j) {
 				if (dev->caps.reserved_qps_cnt[sort[j]] >
 				    dev->caps.reserved_qps_cnt[sort[j - 1]]) {
 					tmp             = sort[j];
 					sort[j]         = sort[j - 1];
 					sort[j - 1]     = tmp;
 				}
 			}
 		}

 		for (i = 1; i < MLX4_NUM_QP_REGION; ++i) {
 			last_base -= dev->caps.reserved_qps_cnt[sort[i]];
 			dev->caps.reserved_qps_base[sort[i]] = last_base;
 			reserved_from_top +=
 				dev->caps.reserved_qps_cnt[sort[i]];
 		}

 	}

        /* Reserve 8 real SQPs in both native and SRIOV modes.
 	* In addition, in SRIOV mode, reserve 8 proxy SQPs per function
 	* (for all PFs and VFs), and 8 corresponding tunnel QPs.
 	* Each proxy SQP works opposite its own tunnel QP.
 	*
 	* The QPs are arranged as follows:
 	* a. 8 real SQPs
 	* b. All the proxy SQPs (8 per function)
 	* c. All the tunnel QPs (8 per function)
 	*/

 	err = mlx4_bitmap_init(&qp_table->bitmap, dev->caps.num_qps,
 			       (1 << 23) - 1, mlx4_num_reserved_sqps(dev),
 			       reserved_from_top);
 	if (err)
 		return err;

 	if (mlx4_is_mfunc(dev)) {
 		/* for PPF use */
 		dev->phys_caps.base_proxy_sqpn = dev->phys_caps.base_sqpn + 8;
 		dev->phys_caps.base_tunnel_sqpn = dev->phys_caps.base_sqpn + 8 + 8 * MLX4_MFUNC_MAX;

 		/* In mfunc, calculate proxy and tunnel qp offsets for the PF here,
 		 * since the PF does not call mlx4_slave_caps */
 		dev->caps.qp0_tunnel = kcalloc(dev->caps.num_ports, sizeof (u32), GFP_KERNEL);
 		dev->caps.qp0_proxy = kcalloc(dev->caps.num_ports, sizeof (u32), GFP_KERNEL);
 		dev->caps.qp1_tunnel = kcalloc(dev->caps.num_ports, sizeof (u32), GFP_KERNEL);
 		dev->caps.qp1_proxy = kcalloc(dev->caps.num_ports, sizeof (u32), GFP_KERNEL);

 		if (!dev->caps.qp0_tunnel || !dev->caps.qp0_proxy ||
 		    !dev->caps.qp1_tunnel || !dev->caps.qp1_proxy) {
 			err = -ENOMEM;
 			goto err_mem;
 		}

 		for (k = 0; k < dev->caps.num_ports; k++) {
 			dev->caps.qp0_proxy[k] = dev->phys_caps.base_proxy_sqpn +
 				8 * mlx4_master_func_num(dev) + k;
 			dev->caps.qp0_tunnel[k] = dev->caps.qp0_proxy[k] + 8 * MLX4_MFUNC_MAX;
 			dev->caps.qp1_proxy[k] = dev->phys_caps.base_proxy_sqpn +
 				8 * mlx4_master_func_num(dev) + MLX4_MAX_PORTS + k;
 			dev->caps.qp1_tunnel[k] = dev->caps.qp1_proxy[k] + 8 * MLX4_MFUNC_MAX;
 		}
 	}


 	err = mlx4_CONF_SPECIAL_QP(dev, dev->phys_caps.base_sqpn);
 	if (err)
 		goto err_mem;
 	return 0;

 err_mem:
 	kfree(dev->caps.qp0_tunnel);
 	kfree(dev->caps.qp0_proxy);
 	kfree(dev->caps.qp1_tunnel);
 	kfree(dev->caps.qp1_proxy);
 	dev->caps.qp0_tunnel = dev->caps.qp0_proxy =
 		dev->caps.qp1_tunnel = dev->caps.qp1_proxy = NULL;
 	return err;
 }

 void mlx4_cleanup_qp_table(struct mlx4_dev *dev)
 {
 	if (mlx4_is_slave(dev))
 		return;

 	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,
 			   MLX4_CMD_WRAPPED);
 	if (!err)
 		memcpy(context, mailbox->buf + 8, sizeof *context);

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

 int mlx4_qp_to_ready(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
 		     struct mlx4_qp_context *context,
 		     struct mlx4_qp *qp, enum mlx4_qp_state *qp_state)
 {
 	int err;
 	int i;
 	enum mlx4_qp_state states[] = {
 		MLX4_QP_STATE_RST,
 		MLX4_QP_STATE_INIT,
 		MLX4_QP_STATE_RTR,
 		MLX4_QP_STATE_RTS
 	};

 	for (i = 0; i < ARRAY_SIZE(states) - 1; i++) {
 		context->flags &= cpu_to_be32(~(0xf << 28));
 		context->flags |= cpu_to_be32(states[i + 1] << 28);
 		err = mlx4_qp_modify(dev, mtt, states[i], states[i + 1],
 				     context, 0, 0, qp);
 		if (err) {
 			mlx4_err(dev, "Failed to bring QP to state: "
 				 "%d with error: %d\n",
 				 states[i + 1], err);
 			return err;
 		}

 		*qp_state = states[i + 1];
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_to_ready);
	/*
	* Copyright (c) 2004 Topspin Communications. All rights reserved.
	* Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
	* Copyright (c) 2005, 2006, 2007, 2008 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/gfp.h>
	#include <linux/export.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_dbg(dev, "Async event for none existent QP %08x\n", qpn);
	return;
	}

	qp->event(qp, event_type);

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

	/* used for INIT/CLOSE port logic */
	static int is_master_qp0(struct mlx4_dev dev, struct mlx4_qp qp, int real_qp0, int proxy_qp0)
	{
	/* this procedure is called after we already know we are on the master */
	/* qp0 is either the proxy qp0, or the real qp0 */
	u32 pf_proxy_offset = dev->phys_caps.base_proxy_sqpn + 8 * mlx4_master_func_num(dev);
	*proxy_qp0 = qp->qpn >= pf_proxy_offset && qp->qpn <= pf_proxy_offset + 1;

	*real_qp0 = qp->qpn >= dev->phys_caps.base_sqpn &&
	qp->qpn <= dev->phys_caps.base_sqpn + 1;

	return real_qp0 \|\| proxy_qp0;
	}

	static 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, int native)
	{
	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_priv *priv = mlx4_priv(dev);
	struct mlx4_cmd_mailbox *mailbox;
	int ret = 0;
	int real_qp0 = 0;
	int proxy_qp0 = 0;
	u8 port;

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

	if (op[cur_state][new_state] == MLX4_CMD_2RST_QP) {
	ret = mlx4_cmd(dev, 0, qp->qpn, 2,
	MLX4_CMD_2RST_QP, MLX4_CMD_TIME_CLASS_A, native);
	if (mlx4_is_master(dev) && cur_state != MLX4_QP_STATE_ERR &&
	cur_state != MLX4_QP_STATE_RST &&
	is_master_qp0(dev, qp, &real_qp0, &proxy_qp0)) {
	port = (qp->qpn & 1) + 1;
	if (proxy_qp0)
	priv->mfunc.master.qp0_state[port].proxy_qp0_active = 0;
	else
	priv->mfunc.master.qp0_state[port].qp0_active = 0;
	}
	return ret;
	}

	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, native);

	if (mlx4_is_master(dev) && is_master_qp0(dev, qp, &real_qp0, &proxy_qp0)) {
	port = (qp->qpn & 1) + 1;
	if (cur_state != MLX4_QP_STATE_ERR &&
	cur_state != MLX4_QP_STATE_RST &&
	new_state == MLX4_QP_STATE_ERR) {
	if (proxy_qp0)
	priv->mfunc.master.qp0_state[port].proxy_qp0_active = 0;
	else
	priv->mfunc.master.qp0_state[port].qp0_active = 0;
	} else if (new_state == MLX4_QP_STATE_RTR) {
	if (proxy_qp0)
	priv->mfunc.master.qp0_state[port].proxy_qp0_active = 1;
	else
	priv->mfunc.master.qp0_state[port].qp0_active = 1;
	}
	}

	mlx4_free_cmd_mailbox(dev, mailbox);
	return ret;
	}

	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)
	{
	return __mlx4_qp_modify(dev, mtt, cur_state, new_state, context,
	optpar, sqd_event, qp, 0);
	}
	EXPORT_SYMBOL_GPL(mlx4_qp_modify);

	int __mlx4_qp_reserve_range(struct mlx4_dev *dev, int cnt, int align,
	int *base)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_qp_table *qp_table = &priv->qp_table;

	*base = mlx4_bitmap_alloc_range(&qp_table->bitmap, cnt, align);
	if (*base == -1)
	return -ENOMEM;

	return 0;
	}

	int mlx4_qp_reserve_range(struct mlx4_dev dev, int cnt, int align, int base)
	{
	u64 in_param = 0;
	u64 out_param;
	int err;

	if (mlx4_is_mfunc(dev)) {
	set_param_l(&in_param, cnt);
	set_param_h(&in_param, align);
	err = mlx4_cmd_imm(dev, in_param, &out_param,
	RES_QP, RES_OP_RESERVE,
	MLX4_CMD_ALLOC_RES,
	MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
	if (err)
	return err;

	*base = get_param_l(&out_param);
	return 0;
	}
	return __mlx4_qp_reserve_range(dev, cnt, align, base);
	}
	EXPORT_SYMBOL_GPL(mlx4_qp_reserve_range);

	void __mlx4_qp_release_range(struct mlx4_dev *dev, int base_qpn, int cnt)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_qp_table *qp_table = &priv->qp_table;

	if (mlx4_is_qp_reserved(dev, (u32) base_qpn))
	return;
	mlx4_bitmap_free_range(&qp_table->bitmap, base_qpn, cnt, MLX4_USE_RR);
	}

	void mlx4_qp_release_range(struct mlx4_dev *dev, int base_qpn, int cnt)
	{
	u64 in_param = 0;
	int err;

	if (mlx4_is_mfunc(dev)) {
	set_param_l(&in_param, base_qpn);
	set_param_h(&in_param, cnt);
	err = mlx4_cmd(dev, in_param, RES_QP, RES_OP_RESERVE,
	MLX4_CMD_FREE_RES,
	MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
	if (err) {
	mlx4_warn(dev, "Failed to release qp range"
	" base:%d cnt:%d\n", base_qpn, cnt);
	}
	} else
	__mlx4_qp_release_range(dev, base_qpn, cnt);
	}
	EXPORT_SYMBOL_GPL(mlx4_qp_release_range);

	int __mlx4_qp_alloc_icm(struct mlx4_dev *dev, int qpn)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_qp_table *qp_table = &priv->qp_table;
	int err;

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

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

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

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

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

	return 0;

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

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

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

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

	err_out:
	return err;
	}

	static int mlx4_qp_alloc_icm(struct mlx4_dev *dev, int qpn)
	{
	u64 param = 0;

	if (mlx4_is_mfunc(dev)) {
	set_param_l(&param, qpn);
	return mlx4_cmd_imm(dev, param, &param, RES_QP, RES_OP_MAP_ICM,
	MLX4_CMD_ALLOC_RES, MLX4_CMD_TIME_CLASS_A,
	MLX4_CMD_WRAPPED);
	}
	return __mlx4_qp_alloc_icm(dev, qpn);
	}

	void __mlx4_qp_free_icm(struct mlx4_dev *dev, int qpn)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_qp_table *qp_table = &priv->qp_table;

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

	static void mlx4_qp_free_icm(struct mlx4_dev *dev, int qpn)
	{
	u64 in_param = 0;

	if (mlx4_is_mfunc(dev)) {
	set_param_l(&in_param, qpn);
	if (mlx4_cmd(dev, in_param, RES_QP, RES_OP_MAP_ICM,
	MLX4_CMD_FREE_RES, MLX4_CMD_TIME_CLASS_A,
	MLX4_CMD_WRAPPED))
	mlx4_warn(dev, "Failed to free icm of qp:%d\n", qpn);
	} else
	__mlx4_qp_free_icm(dev, qpn);
	}

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

	if (!qpn)
	return -EINVAL;

	qp->qpn = qpn;

	err = mlx4_qp_alloc_icm(dev, qpn);
	if (err)
	return err;

	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_icm;

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

	return 0;

	err_icm:
	mlx4_qp_free_icm(dev, 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)
	{
	if (atomic_dec_and_test(&qp->refcount))
	complete(&qp->free);
	wait_for_completion(&qp->free);

	mlx4_qp_free_icm(dev, 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, MLX4_CMD_NATIVE);
	}

	int mlx4_init_qp_table(struct mlx4_dev *dev)
	{
	struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
	int err;
	int reserved_from_top = 0;
	int k;

	spin_lock_init(&qp_table->lock);
	INIT_RADIX_TREE(&dev->qp_table_tree, GFP_ATOMIC);
	if (mlx4_is_slave(dev))
	return 0;

	/*
	* 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.
	*
	* We also reserve the MSB of the 24-bit QP number to indicate
	* that a QP is an XRC QP.
	*/
	dev->phys_caps.base_sqpn =
	ALIGN(dev->caps.reserved_qps_cnt[MLX4_QP_REGION_FW], 8);

	{
	int sort[MLX4_NUM_QP_REGION];
	int i, j, tmp;
	int last_base = dev->caps.num_qps;

	for (i = 1; i < MLX4_NUM_QP_REGION; ++i)
	sort[i] = i;

	for (i = MLX4_NUM_QP_REGION; i > 0; --i) {
	for (j = 2; j < i; ++j) {
	if (dev->caps.reserved_qps_cnt[sort[j]] >
	dev->caps.reserved_qps_cnt[sort[j - 1]]) {
	tmp = sort[j];
	sort[j] = sort[j - 1];
	sort[j - 1] = tmp;
	}
	}
	}

	for (i = 1; i < MLX4_NUM_QP_REGION; ++i) {
	last_base -= dev->caps.reserved_qps_cnt[sort[i]];
	dev->caps.reserved_qps_base[sort[i]] = last_base;
	reserved_from_top +=
	dev->caps.reserved_qps_cnt[sort[i]];
	}

	}

	/* Reserve 8 real SQPs in both native and SRIOV modes.
	* In addition, in SRIOV mode, reserve 8 proxy SQPs per function
	* (for all PFs and VFs), and 8 corresponding tunnel QPs.
	* Each proxy SQP works opposite its own tunnel QP.
	*
	* The QPs are arranged as follows:
	* a. 8 real SQPs
	* b. All the proxy SQPs (8 per function)
	* c. All the tunnel QPs (8 per function)
	*/

	err = mlx4_bitmap_init(&qp_table->bitmap, dev->caps.num_qps,
	(1 << 23) - 1, mlx4_num_reserved_sqps(dev),
	reserved_from_top);
	if (err)
	return err;

	if (mlx4_is_mfunc(dev)) {
	/* for PPF use */
	dev->phys_caps.base_proxy_sqpn = dev->phys_caps.base_sqpn + 8;
	dev->phys_caps.base_tunnel_sqpn = dev->phys_caps.base_sqpn + 8 + 8 * MLX4_MFUNC_MAX;

	/* In mfunc, calculate proxy and tunnel qp offsets for the PF here,
	* since the PF does not call mlx4_slave_caps */
	dev->caps.qp0_tunnel = kcalloc(dev->caps.num_ports, sizeof (u32), GFP_KERNEL);
	dev->caps.qp0_proxy = kcalloc(dev->caps.num_ports, sizeof (u32), GFP_KERNEL);
	dev->caps.qp1_tunnel = kcalloc(dev->caps.num_ports, sizeof (u32), GFP_KERNEL);
	dev->caps.qp1_proxy = kcalloc(dev->caps.num_ports, sizeof (u32), GFP_KERNEL);

	if (!dev->caps.qp0_tunnel \|\| !dev->caps.qp0_proxy \|\|
	!dev->caps.qp1_tunnel \|\| !dev->caps.qp1_proxy) {
	err = -ENOMEM;
	goto err_mem;
	}

	for (k = 0; k < dev->caps.num_ports; k++) {
	dev->caps.qp0_proxy[k] = dev->phys_caps.base_proxy_sqpn +
	8 * mlx4_master_func_num(dev) + k;
	dev->caps.qp0_tunnel[k] = dev->caps.qp0_proxy[k] + 8 * MLX4_MFUNC_MAX;
	dev->caps.qp1_proxy[k] = dev->phys_caps.base_proxy_sqpn +
	8 * mlx4_master_func_num(dev) + MLX4_MAX_PORTS + k;
	dev->caps.qp1_tunnel[k] = dev->caps.qp1_proxy[k] + 8 * MLX4_MFUNC_MAX;
	}
	}


	err = mlx4_CONF_SPECIAL_QP(dev, dev->phys_caps.base_sqpn);
	if (err)
	goto err_mem;
	return 0;

	err_mem:
	kfree(dev->caps.qp0_tunnel);
	kfree(dev->caps.qp0_proxy);
	kfree(dev->caps.qp1_tunnel);
	kfree(dev->caps.qp1_proxy);
	dev->caps.qp0_tunnel = dev->caps.qp0_proxy =
	dev->caps.qp1_tunnel = dev->caps.qp1_proxy = NULL;
	return err;
	}

	void mlx4_cleanup_qp_table(struct mlx4_dev *dev)
	{
	if (mlx4_is_slave(dev))
	return;

	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,
	MLX4_CMD_WRAPPED);
	if (!err)
	memcpy(context, mailbox->buf + 8, sizeof *context);

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

	int mlx4_qp_to_ready(struct mlx4_dev dev, struct mlx4_mtt mtt,
	struct mlx4_qp_context *context,
	struct mlx4_qp qp, enum mlx4_qp_state qp_state)
	{
	int err;
	int i;
	enum mlx4_qp_state states[] = {
	MLX4_QP_STATE_RST,
	MLX4_QP_STATE_INIT,
	MLX4_QP_STATE_RTR,
	MLX4_QP_STATE_RTS
	};

	for (i = 0; i < ARRAY_SIZE(states) - 1; i++) {
	context->flags &= cpu_to_be32(~(0xf << 28));
	context->flags \|= cpu_to_be32(states[i + 1] << 28);
	err = mlx4_qp_modify(dev, mtt, states[i], states[i + 1],
	context, 0, 0, qp);
	if (err) {
	mlx4_err(dev, "Failed to bring QP to state: "
	"%d with error: %d\n",
	states[i + 1], err);
	return err;
	}

	*qp_state = states[i + 1];
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(mlx4_qp_to_ready);