drivers/infiniband/core/verbs.c - linux/kernel/git/mellanox/linux - Git at Google

 /*
  * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
  * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
  * Copyright (c) 2004 Intel Corporation.  All rights reserved.
  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
  * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
  * Copyright (c) 2005 Cisco Systems.  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.
  *
  * $Id: verbs.c 1349 2004-12-16 21:09:43Z roland $
  */

 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/string.h>

 #include <rdma/ib_verbs.h>
 #include <rdma/ib_cache.h>

 /* Protection domains */

 struct ib_pd *ib_alloc_pd(struct ib_device *device)
 {
 	struct ib_pd *pd;

 	pd = device->alloc_pd(device, NULL, NULL);

 	if (!IS_ERR(pd)) {
 		pd->device  = device;
 		pd->uobject = NULL;
 		atomic_set(&pd->usecnt, 0);
 	}

 	return pd;
 }
 EXPORT_SYMBOL(ib_alloc_pd);

 int ib_dealloc_pd(struct ib_pd *pd)
 {
 	if (atomic_read(&pd->usecnt))
 		return -EBUSY;

 	return pd->device->dealloc_pd(pd);
 }
 EXPORT_SYMBOL(ib_dealloc_pd);

 /* Address handles */

 struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
 {
 	struct ib_ah *ah;

 	ah = pd->device->create_ah(pd, ah_attr);

 	if (!IS_ERR(ah)) {
 		ah->device  = pd->device;
 		ah->pd      = pd;
 		ah->uobject = NULL;
 		atomic_inc(&pd->usecnt);
 	}

 	return ah;
 }
 EXPORT_SYMBOL(ib_create_ah);

 struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, struct ib_wc *wc,
 				   struct ib_grh *grh, u8 port_num)
 {
 	struct ib_ah_attr ah_attr;
 	u32 flow_class;
 	u16 gid_index;
 	int ret;

 	memset(&ah_attr, 0, sizeof ah_attr);
 	ah_attr.dlid = wc->slid;
 	ah_attr.sl = wc->sl;
 	ah_attr.src_path_bits = wc->dlid_path_bits;
 	ah_attr.port_num = port_num;

 	if (wc->wc_flags & IB_WC_GRH) {
 		ah_attr.ah_flags = IB_AH_GRH;
 		ah_attr.grh.dgid = grh->dgid;

 		ret = ib_find_cached_gid(pd->device, &grh->sgid, &port_num,
 					 &gid_index);
 		if (ret)
 			return ERR_PTR(ret);

 		ah_attr.grh.sgid_index = (u8) gid_index;
 		flow_class = be32_to_cpu(grh->version_tclass_flow);
 		ah_attr.grh.flow_label = flow_class & 0xFFFFF;
 		ah_attr.grh.traffic_class = (flow_class >> 20) & 0xFF;
 		ah_attr.grh.hop_limit = grh->hop_limit;
 	}

 	return ib_create_ah(pd, &ah_attr);
 }
 EXPORT_SYMBOL(ib_create_ah_from_wc);

 int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 {
 	return ah->device->modify_ah ?
 		ah->device->modify_ah(ah, ah_attr) :
 		-ENOSYS;
 }
 EXPORT_SYMBOL(ib_modify_ah);

 int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 {
 	return ah->device->query_ah ?
 		ah->device->query_ah(ah, ah_attr) :
 		-ENOSYS;
 }
 EXPORT_SYMBOL(ib_query_ah);

 int ib_destroy_ah(struct ib_ah *ah)
 {
 	struct ib_pd *pd;
 	int ret;

 	pd = ah->pd;
 	ret = ah->device->destroy_ah(ah);
 	if (!ret)
 		atomic_dec(&pd->usecnt);

 	return ret;
 }
 EXPORT_SYMBOL(ib_destroy_ah);

 /* Shared receive queues */

 struct ib_srq *ib_create_srq(struct ib_pd *pd,
 			     struct ib_srq_init_attr *srq_init_attr)
 {
 	struct ib_srq *srq;

 	if (!pd->device->create_srq)
 		return ERR_PTR(-ENOSYS);

 	srq = pd->device->create_srq(pd, srq_init_attr, NULL);

 	if (!IS_ERR(srq)) {
 		srq->device    	   = pd->device;
 		srq->pd        	   = pd;
 		srq->uobject       = NULL;
 		srq->event_handler = srq_init_attr->event_handler;
 		srq->srq_context   = srq_init_attr->srq_context;
 		atomic_inc(&pd->usecnt);
 		atomic_set(&srq->usecnt, 0);
 	}

 	return srq;
 }
 EXPORT_SYMBOL(ib_create_srq);

 int ib_modify_srq(struct ib_srq *srq,
 		  struct ib_srq_attr *srq_attr,
 		  enum ib_srq_attr_mask srq_attr_mask)
 {
 	return srq->device->modify_srq(srq, srq_attr, srq_attr_mask);
 }
 EXPORT_SYMBOL(ib_modify_srq);

 int ib_query_srq(struct ib_srq *srq,
 		 struct ib_srq_attr *srq_attr)
 {
 	return srq->device->query_srq ?
 		srq->device->query_srq(srq, srq_attr) : -ENOSYS;
 }
 EXPORT_SYMBOL(ib_query_srq);

 int ib_destroy_srq(struct ib_srq *srq)
 {
 	struct ib_pd *pd;
 	int ret;

 	if (atomic_read(&srq->usecnt))
 		return -EBUSY;

 	pd = srq->pd;

 	ret = srq->device->destroy_srq(srq);
 	if (!ret)
 		atomic_dec(&pd->usecnt);

 	return ret;
 }
 EXPORT_SYMBOL(ib_destroy_srq);

 /* Queue pairs */

 struct ib_qp *ib_create_qp(struct ib_pd *pd,
 			   struct ib_qp_init_attr *qp_init_attr)
 {
 	struct ib_qp *qp;

 	qp = pd->device->create_qp(pd, qp_init_attr, NULL);

 	if (!IS_ERR(qp)) {
 		qp->device     	  = pd->device;
 		qp->pd         	  = pd;
 		qp->send_cq    	  = qp_init_attr->send_cq;
 		qp->recv_cq    	  = qp_init_attr->recv_cq;
 		qp->srq	       	  = qp_init_attr->srq;
 		qp->uobject       = NULL;
 		qp->event_handler = qp_init_attr->event_handler;
 		qp->qp_context    = qp_init_attr->qp_context;
 		qp->qp_type	  = qp_init_attr->qp_type;
 		atomic_inc(&pd->usecnt);
 		atomic_inc(&qp_init_attr->send_cq->usecnt);
 		atomic_inc(&qp_init_attr->recv_cq->usecnt);
 		if (qp_init_attr->srq)
 			atomic_inc(&qp_init_attr->srq->usecnt);
 	}

 	return qp;
 }
 EXPORT_SYMBOL(ib_create_qp);

 int ib_modify_qp(struct ib_qp *qp,
 		 struct ib_qp_attr *qp_attr,
 		 int qp_attr_mask)
 {
 	return qp->device->modify_qp(qp, qp_attr, qp_attr_mask);
 }
 EXPORT_SYMBOL(ib_modify_qp);

 int ib_query_qp(struct ib_qp *qp,
 		struct ib_qp_attr *qp_attr,
 		int qp_attr_mask,
 		struct ib_qp_init_attr *qp_init_attr)
 {
 	return qp->device->query_qp ?
 		qp->device->query_qp(qp, qp_attr, qp_attr_mask, qp_init_attr) :
 		-ENOSYS;
 }
 EXPORT_SYMBOL(ib_query_qp);

 int ib_destroy_qp(struct ib_qp *qp)
 {
 	struct ib_pd *pd;
 	struct ib_cq *scq, *rcq;
 	struct ib_srq *srq;
 	int ret;

 	pd  = qp->pd;
 	scq = qp->send_cq;
 	rcq = qp->recv_cq;
 	srq = qp->srq;

 	ret = qp->device->destroy_qp(qp);
 	if (!ret) {
 		atomic_dec(&pd->usecnt);
 		atomic_dec(&scq->usecnt);
 		atomic_dec(&rcq->usecnt);
 		if (srq)
 			atomic_dec(&srq->usecnt);
 	}

 	return ret;
 }
 EXPORT_SYMBOL(ib_destroy_qp);

 /* Completion queues */

 struct ib_cq *ib_create_cq(struct ib_device *device,
 			   ib_comp_handler comp_handler,
 			   void (*event_handler)(struct ib_event *, void *),
 			   void *cq_context, int cqe)
 {
 	struct ib_cq *cq;

 	cq = device->create_cq(device, cqe, NULL, NULL);

 	if (!IS_ERR(cq)) {
 		cq->device        = device;
 		cq->uobject       = NULL;
 		cq->comp_handler  = comp_handler;
 		cq->event_handler = event_handler;
 		cq->cq_context    = cq_context;
 		atomic_set(&cq->usecnt, 0);
 	}

 	return cq;
 }
 EXPORT_SYMBOL(ib_create_cq);

 int ib_destroy_cq(struct ib_cq *cq)
 {
 	if (atomic_read(&cq->usecnt))
 		return -EBUSY;

 	return cq->device->destroy_cq(cq);
 }
 EXPORT_SYMBOL(ib_destroy_cq);

 int ib_resize_cq(struct ib_cq *cq,
                  int           cqe)
 {
 	return cq->device->resize_cq ?
 		cq->device->resize_cq(cq, cqe) : -ENOSYS;
 }
 EXPORT_SYMBOL(ib_resize_cq);

 /* Memory regions */

 struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
 {
 	struct ib_mr *mr;

 	mr = pd->device->get_dma_mr(pd, mr_access_flags);

 	if (!IS_ERR(mr)) {
 		mr->device  = pd->device;
 		mr->pd      = pd;
 		mr->uobject = NULL;
 		atomic_inc(&pd->usecnt);
 		atomic_set(&mr->usecnt, 0);
 	}

 	return mr;
 }
 EXPORT_SYMBOL(ib_get_dma_mr);

 struct ib_mr *ib_reg_phys_mr(struct ib_pd *pd,
 			     struct ib_phys_buf *phys_buf_array,
 			     int num_phys_buf,
 			     int mr_access_flags,
 			     u64 *iova_start)
 {
 	struct ib_mr *mr;

 	mr = pd->device->reg_phys_mr(pd, phys_buf_array, num_phys_buf,
 				     mr_access_flags, iova_start);

 	if (!IS_ERR(mr)) {
 		mr->device  = pd->device;
 		mr->pd      = pd;
 		mr->uobject = NULL;
 		atomic_inc(&pd->usecnt);
 		atomic_set(&mr->usecnt, 0);
 	}

 	return mr;
 }
 EXPORT_SYMBOL(ib_reg_phys_mr);

 int ib_rereg_phys_mr(struct ib_mr *mr,
 		     int mr_rereg_mask,
 		     struct ib_pd *pd,
 		     struct ib_phys_buf *phys_buf_array,
 		     int num_phys_buf,
 		     int mr_access_flags,
 		     u64 *iova_start)
 {
 	struct ib_pd *old_pd;
 	int ret;

 	if (!mr->device->rereg_phys_mr)
 		return -ENOSYS;

 	if (atomic_read(&mr->usecnt))
 		return -EBUSY;

 	old_pd = mr->pd;

 	ret = mr->device->rereg_phys_mr(mr, mr_rereg_mask, pd,
 					phys_buf_array, num_phys_buf,
 					mr_access_flags, iova_start);

 	if (!ret && (mr_rereg_mask & IB_MR_REREG_PD)) {
 		atomic_dec(&old_pd->usecnt);
 		atomic_inc(&pd->usecnt);
 	}

 	return ret;
 }
 EXPORT_SYMBOL(ib_rereg_phys_mr);

 int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr)
 {
 	return mr->device->query_mr ?
 		mr->device->query_mr(mr, mr_attr) : -ENOSYS;
 }
 EXPORT_SYMBOL(ib_query_mr);

 int ib_dereg_mr(struct ib_mr *mr)
 {
 	struct ib_pd *pd;
 	int ret;

 	if (atomic_read(&mr->usecnt))
 		return -EBUSY;

 	pd = mr->pd;
 	ret = mr->device->dereg_mr(mr);
 	if (!ret)
 		atomic_dec(&pd->usecnt);

 	return ret;
 }
 EXPORT_SYMBOL(ib_dereg_mr);

 /* Memory windows */

 struct ib_mw *ib_alloc_mw(struct ib_pd *pd)
 {
 	struct ib_mw *mw;

 	if (!pd->device->alloc_mw)
 		return ERR_PTR(-ENOSYS);

 	mw = pd->device->alloc_mw(pd);
 	if (!IS_ERR(mw)) {
 		mw->device  = pd->device;
 		mw->pd      = pd;
 		mw->uobject = NULL;
 		atomic_inc(&pd->usecnt);
 	}

 	return mw;
 }
 EXPORT_SYMBOL(ib_alloc_mw);

 int ib_dealloc_mw(struct ib_mw *mw)
 {
 	struct ib_pd *pd;
 	int ret;

 	pd = mw->pd;
 	ret = mw->device->dealloc_mw(mw);
 	if (!ret)
 		atomic_dec(&pd->usecnt);

 	return ret;
 }
 EXPORT_SYMBOL(ib_dealloc_mw);

 /* "Fast" memory regions */

 struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
 			    int mr_access_flags,
 			    struct ib_fmr_attr *fmr_attr)
 {
 	struct ib_fmr *fmr;

 	if (!pd->device->alloc_fmr)
 		return ERR_PTR(-ENOSYS);

 	fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
 	if (!IS_ERR(fmr)) {
 		fmr->device = pd->device;
 		fmr->pd     = pd;
 		atomic_inc(&pd->usecnt);
 	}

 	return fmr;
 }
 EXPORT_SYMBOL(ib_alloc_fmr);

 int ib_unmap_fmr(struct list_head *fmr_list)
 {
 	struct ib_fmr *fmr;

 	if (list_empty(fmr_list))
 		return 0;

 	fmr = list_entry(fmr_list->next, struct ib_fmr, list);
 	return fmr->device->unmap_fmr(fmr_list);
 }
 EXPORT_SYMBOL(ib_unmap_fmr);

 int ib_dealloc_fmr(struct ib_fmr *fmr)
 {
 	struct ib_pd *pd;
 	int ret;

 	pd = fmr->pd;
 	ret = fmr->device->dealloc_fmr(fmr);
 	if (!ret)
 		atomic_dec(&pd->usecnt);

 	return ret;
 }
 EXPORT_SYMBOL(ib_dealloc_fmr);

 /* Multicast groups */

 int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
 {
 	if (!qp->device->attach_mcast)
 		return -ENOSYS;
 	if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
 		return -EINVAL;

 	return qp->device->attach_mcast(qp, gid, lid);
 }
 EXPORT_SYMBOL(ib_attach_mcast);

 int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
 {
 	if (!qp->device->detach_mcast)
 		return -ENOSYS;
 	if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
 		return -EINVAL;

 	return qp->device->detach_mcast(qp, gid, lid);
 }
 EXPORT_SYMBOL(ib_detach_mcast);
	/*
	* Copyright (c) 2004 Mellanox Technologies Ltd. All rights reserved.
	* Copyright (c) 2004 Infinicon Corporation. All rights reserved.
	* Copyright (c) 2004 Intel Corporation. All rights reserved.
	* Copyright (c) 2004 Topspin Corporation. All rights reserved.
	* Copyright (c) 2004 Voltaire Corporation. All rights reserved.
	* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
	* Copyright (c) 2005 Cisco Systems. 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.
	*
	* $Id: verbs.c 1349 2004-12-16 21:09:43Z roland $
	*/

	#include <linux/errno.h>
	#include <linux/err.h>
	#include <linux/string.h>

	#include <rdma/ib_verbs.h>
	#include <rdma/ib_cache.h>

	/* Protection domains */

	struct ib_pd ib_alloc_pd(struct ib_device device)
	{
	struct ib_pd *pd;

	pd = device->alloc_pd(device, NULL, NULL);

	if (!IS_ERR(pd)) {
	pd->device = device;
	pd->uobject = NULL;
	atomic_set(&pd->usecnt, 0);
	}

	return pd;
	}
	EXPORT_SYMBOL(ib_alloc_pd);

	int ib_dealloc_pd(struct ib_pd *pd)
	{
	if (atomic_read(&pd->usecnt))
	return -EBUSY;

	return pd->device->dealloc_pd(pd);
	}
	EXPORT_SYMBOL(ib_dealloc_pd);

	/* Address handles */

	struct ib_ah ib_create_ah(struct ib_pd pd, struct ib_ah_attr *ah_attr)
	{
	struct ib_ah *ah;

	ah = pd->device->create_ah(pd, ah_attr);

	if (!IS_ERR(ah)) {
	ah->device = pd->device;
	ah->pd = pd;
	ah->uobject = NULL;
	atomic_inc(&pd->usecnt);
	}

	return ah;
	}
	EXPORT_SYMBOL(ib_create_ah);

	struct ib_ah ib_create_ah_from_wc(struct ib_pd pd, struct ib_wc *wc,
	struct ib_grh *grh, u8 port_num)
	{
	struct ib_ah_attr ah_attr;
	u32 flow_class;
	u16 gid_index;
	int ret;

	memset(&ah_attr, 0, sizeof ah_attr);
	ah_attr.dlid = wc->slid;
	ah_attr.sl = wc->sl;
	ah_attr.src_path_bits = wc->dlid_path_bits;
	ah_attr.port_num = port_num;

	if (wc->wc_flags & IB_WC_GRH) {
	ah_attr.ah_flags = IB_AH_GRH;
	ah_attr.grh.dgid = grh->dgid;

	ret = ib_find_cached_gid(pd->device, &grh->sgid, &port_num,
	&gid_index);
	if (ret)
	return ERR_PTR(ret);

	ah_attr.grh.sgid_index = (u8) gid_index;
	flow_class = be32_to_cpu(grh->version_tclass_flow);
	ah_attr.grh.flow_label = flow_class & 0xFFFFF;
	ah_attr.grh.traffic_class = (flow_class >> 20) & 0xFF;
	ah_attr.grh.hop_limit = grh->hop_limit;
	}

	return ib_create_ah(pd, &ah_attr);
	}
	EXPORT_SYMBOL(ib_create_ah_from_wc);

	int ib_modify_ah(struct ib_ah ah, struct ib_ah_attr ah_attr)
	{
	return ah->device->modify_ah ?
	ah->device->modify_ah(ah, ah_attr) :
	-ENOSYS;
	}
	EXPORT_SYMBOL(ib_modify_ah);

	int ib_query_ah(struct ib_ah ah, struct ib_ah_attr ah_attr)
	{
	return ah->device->query_ah ?
	ah->device->query_ah(ah, ah_attr) :
	-ENOSYS;
	}
	EXPORT_SYMBOL(ib_query_ah);

	int ib_destroy_ah(struct ib_ah *ah)
	{
	struct ib_pd *pd;
	int ret;

	pd = ah->pd;
	ret = ah->device->destroy_ah(ah);
	if (!ret)
	atomic_dec(&pd->usecnt);

	return ret;
	}
	EXPORT_SYMBOL(ib_destroy_ah);

	/* Shared receive queues */

	struct ib_srq ib_create_srq(struct ib_pd pd,
	struct ib_srq_init_attr *srq_init_attr)
	{
	struct ib_srq *srq;

	if (!pd->device->create_srq)
	return ERR_PTR(-ENOSYS);

	srq = pd->device->create_srq(pd, srq_init_attr, NULL);

	if (!IS_ERR(srq)) {
	srq->device = pd->device;
	srq->pd = pd;
	srq->uobject = NULL;
	srq->event_handler = srq_init_attr->event_handler;
	srq->srq_context = srq_init_attr->srq_context;
	atomic_inc(&pd->usecnt);
	atomic_set(&srq->usecnt, 0);
	}

	return srq;
	}
	EXPORT_SYMBOL(ib_create_srq);

	int ib_modify_srq(struct ib_srq *srq,
	struct ib_srq_attr *srq_attr,
	enum ib_srq_attr_mask srq_attr_mask)
	{
	return srq->device->modify_srq(srq, srq_attr, srq_attr_mask);
	}
	EXPORT_SYMBOL(ib_modify_srq);

	int ib_query_srq(struct ib_srq *srq,
	struct ib_srq_attr *srq_attr)
	{
	return srq->device->query_srq ?
	srq->device->query_srq(srq, srq_attr) : -ENOSYS;
	}
	EXPORT_SYMBOL(ib_query_srq);

	int ib_destroy_srq(struct ib_srq *srq)
	{
	struct ib_pd *pd;
	int ret;

	if (atomic_read(&srq->usecnt))
	return -EBUSY;

	pd = srq->pd;

	ret = srq->device->destroy_srq(srq);
	if (!ret)
	atomic_dec(&pd->usecnt);

	return ret;
	}
	EXPORT_SYMBOL(ib_destroy_srq);

	/* Queue pairs */

	struct ib_qp ib_create_qp(struct ib_pd pd,
	struct ib_qp_init_attr *qp_init_attr)
	{
	struct ib_qp *qp;

	qp = pd->device->create_qp(pd, qp_init_attr, NULL);

	if (!IS_ERR(qp)) {
	qp->device = pd->device;
	qp->pd = pd;
	qp->send_cq = qp_init_attr->send_cq;
	qp->recv_cq = qp_init_attr->recv_cq;
	qp->srq = qp_init_attr->srq;
	qp->uobject = NULL;
	qp->event_handler = qp_init_attr->event_handler;
	qp->qp_context = qp_init_attr->qp_context;
	qp->qp_type = qp_init_attr->qp_type;
	atomic_inc(&pd->usecnt);
	atomic_inc(&qp_init_attr->send_cq->usecnt);
	atomic_inc(&qp_init_attr->recv_cq->usecnt);
	if (qp_init_attr->srq)
	atomic_inc(&qp_init_attr->srq->usecnt);
	}

	return qp;
	}
	EXPORT_SYMBOL(ib_create_qp);

	int ib_modify_qp(struct ib_qp *qp,
	struct ib_qp_attr *qp_attr,
	int qp_attr_mask)
	{
	return qp->device->modify_qp(qp, qp_attr, qp_attr_mask);
	}
	EXPORT_SYMBOL(ib_modify_qp);

	int ib_query_qp(struct ib_qp *qp,
	struct ib_qp_attr *qp_attr,
	int qp_attr_mask,
	struct ib_qp_init_attr *qp_init_attr)
	{
	return qp->device->query_qp ?
	qp->device->query_qp(qp, qp_attr, qp_attr_mask, qp_init_attr) :
	-ENOSYS;
	}
	EXPORT_SYMBOL(ib_query_qp);

	int ib_destroy_qp(struct ib_qp *qp)
	{
	struct ib_pd *pd;
	struct ib_cq scq, rcq;
	struct ib_srq *srq;
	int ret;

	pd = qp->pd;
	scq = qp->send_cq;
	rcq = qp->recv_cq;
	srq = qp->srq;

	ret = qp->device->destroy_qp(qp);
	if (!ret) {
	atomic_dec(&pd->usecnt);
	atomic_dec(&scq->usecnt);
	atomic_dec(&rcq->usecnt);
	if (srq)
	atomic_dec(&srq->usecnt);
	}

	return ret;
	}
	EXPORT_SYMBOL(ib_destroy_qp);

	/* Completion queues */

	struct ib_cq ib_create_cq(struct ib_device device,
	ib_comp_handler comp_handler,
	void (event_handler)(struct ib_event , void *),
	void *cq_context, int cqe)
	{
	struct ib_cq *cq;

	cq = device->create_cq(device, cqe, NULL, NULL);

	if (!IS_ERR(cq)) {
	cq->device = device;
	cq->uobject = NULL;
	cq->comp_handler = comp_handler;
	cq->event_handler = event_handler;
	cq->cq_context = cq_context;
	atomic_set(&cq->usecnt, 0);
	}

	return cq;
	}
	EXPORT_SYMBOL(ib_create_cq);

	int ib_destroy_cq(struct ib_cq *cq)
	{
	if (atomic_read(&cq->usecnt))
	return -EBUSY;

	return cq->device->destroy_cq(cq);
	}
	EXPORT_SYMBOL(ib_destroy_cq);

	int ib_resize_cq(struct ib_cq *cq,
	int cqe)
	{
	return cq->device->resize_cq ?
	cq->device->resize_cq(cq, cqe) : -ENOSYS;
	}
	EXPORT_SYMBOL(ib_resize_cq);

	/* Memory regions */

	struct ib_mr ib_get_dma_mr(struct ib_pd pd, int mr_access_flags)
	{
	struct ib_mr *mr;

	mr = pd->device->get_dma_mr(pd, mr_access_flags);

	if (!IS_ERR(mr)) {
	mr->device = pd->device;
	mr->pd = pd;
	mr->uobject = NULL;
	atomic_inc(&pd->usecnt);
	atomic_set(&mr->usecnt, 0);
	}

	return mr;
	}
	EXPORT_SYMBOL(ib_get_dma_mr);

	struct ib_mr ib_reg_phys_mr(struct ib_pd pd,
	struct ib_phys_buf *phys_buf_array,
	int num_phys_buf,
	int mr_access_flags,
	u64 *iova_start)
	{
	struct ib_mr *mr;

	mr = pd->device->reg_phys_mr(pd, phys_buf_array, num_phys_buf,
	mr_access_flags, iova_start);

	if (!IS_ERR(mr)) {
	mr->device = pd->device;
	mr->pd = pd;
	mr->uobject = NULL;
	atomic_inc(&pd->usecnt);
	atomic_set(&mr->usecnt, 0);
	}

	return mr;
	}
	EXPORT_SYMBOL(ib_reg_phys_mr);

	int ib_rereg_phys_mr(struct ib_mr *mr,
	int mr_rereg_mask,
	struct ib_pd *pd,
	struct ib_phys_buf *phys_buf_array,
	int num_phys_buf,
	int mr_access_flags,
	u64 *iova_start)
	{
	struct ib_pd *old_pd;
	int ret;

	if (!mr->device->rereg_phys_mr)
	return -ENOSYS;

	if (atomic_read(&mr->usecnt))
	return -EBUSY;

	old_pd = mr->pd;

	ret = mr->device->rereg_phys_mr(mr, mr_rereg_mask, pd,
	phys_buf_array, num_phys_buf,
	mr_access_flags, iova_start);

	if (!ret && (mr_rereg_mask & IB_MR_REREG_PD)) {
	atomic_dec(&old_pd->usecnt);
	atomic_inc(&pd->usecnt);
	}

	return ret;
	}
	EXPORT_SYMBOL(ib_rereg_phys_mr);

	int ib_query_mr(struct ib_mr mr, struct ib_mr_attr mr_attr)
	{
	return mr->device->query_mr ?
	mr->device->query_mr(mr, mr_attr) : -ENOSYS;
	}
	EXPORT_SYMBOL(ib_query_mr);

	int ib_dereg_mr(struct ib_mr *mr)
	{
	struct ib_pd *pd;
	int ret;

	if (atomic_read(&mr->usecnt))
	return -EBUSY;

	pd = mr->pd;
	ret = mr->device->dereg_mr(mr);
	if (!ret)
	atomic_dec(&pd->usecnt);

	return ret;
	}
	EXPORT_SYMBOL(ib_dereg_mr);

	/* Memory windows */

	struct ib_mw ib_alloc_mw(struct ib_pd pd)
	{
	struct ib_mw *mw;

	if (!pd->device->alloc_mw)
	return ERR_PTR(-ENOSYS);

	mw = pd->device->alloc_mw(pd);
	if (!IS_ERR(mw)) {
	mw->device = pd->device;
	mw->pd = pd;
	mw->uobject = NULL;
	atomic_inc(&pd->usecnt);
	}

	return mw;
	}
	EXPORT_SYMBOL(ib_alloc_mw);

	int ib_dealloc_mw(struct ib_mw *mw)
	{
	struct ib_pd *pd;
	int ret;

	pd = mw->pd;
	ret = mw->device->dealloc_mw(mw);
	if (!ret)
	atomic_dec(&pd->usecnt);

	return ret;
	}
	EXPORT_SYMBOL(ib_dealloc_mw);

	/* "Fast" memory regions */

	struct ib_fmr ib_alloc_fmr(struct ib_pd pd,
	int mr_access_flags,
	struct ib_fmr_attr *fmr_attr)
	{
	struct ib_fmr *fmr;

	if (!pd->device->alloc_fmr)
	return ERR_PTR(-ENOSYS);

	fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
	if (!IS_ERR(fmr)) {
	fmr->device = pd->device;
	fmr->pd = pd;
	atomic_inc(&pd->usecnt);
	}

	return fmr;
	}
	EXPORT_SYMBOL(ib_alloc_fmr);

	int ib_unmap_fmr(struct list_head *fmr_list)
	{
	struct ib_fmr *fmr;

	if (list_empty(fmr_list))
	return 0;

	fmr = list_entry(fmr_list->next, struct ib_fmr, list);
	return fmr->device->unmap_fmr(fmr_list);
	}
	EXPORT_SYMBOL(ib_unmap_fmr);

	int ib_dealloc_fmr(struct ib_fmr *fmr)
	{
	struct ib_pd *pd;
	int ret;

	pd = fmr->pd;
	ret = fmr->device->dealloc_fmr(fmr);
	if (!ret)
	atomic_dec(&pd->usecnt);

	return ret;
	}
	EXPORT_SYMBOL(ib_dealloc_fmr);

	/* Multicast groups */

	int ib_attach_mcast(struct ib_qp qp, union ib_gid gid, u16 lid)
	{
	if (!qp->device->attach_mcast)
	return -ENOSYS;
	if (gid->raw[0] != 0xff \|\| qp->qp_type != IB_QPT_UD)
	return -EINVAL;

	return qp->device->attach_mcast(qp, gid, lid);
	}
	EXPORT_SYMBOL(ib_attach_mcast);

	int ib_detach_mcast(struct ib_qp qp, union ib_gid gid, u16 lid)
	{
	if (!qp->device->detach_mcast)
	return -ENOSYS;
	if (gid->raw[0] != 0xff \|\| qp->qp_type != IB_QPT_UD)
	return -EINVAL;

	return qp->device->detach_mcast(qp, gid, lid);
	}
	EXPORT_SYMBOL(ib_detach_mcast);