[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / hw / mlx4 / srq.c

/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/mlx4/qp.h>
#include <linux/mlx4/srq.h>
#include <linux/slab.h>

#include "mlx4_ib.h"
#include "user.h"

static void *get_wqe(struct mlx4_ib_srq *srq, int n)
{
	return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
}

static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
{
	struct ib_event event;
	struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;

	if (ibsrq->event_handler) {
		event.device      = ibsrq->device;
		event.element.srq = ibsrq;
		switch (type) {
		case MLX4_EVENT_TYPE_SRQ_LIMIT:
			event.event = IB_EVENT_SRQ_LIMIT_REACHED;
			break;
		case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
			event.event = IB_EVENT_SRQ_ERR;
			break;
		default:
			pr_warn("Unexpected event type %d "
			       "on SRQ %06x\n", type, srq->srqn);
			return;
		}

		ibsrq->event_handler(&event, ibsrq->srq_context);
	}
}

struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
				  struct ib_srq_init_attr *init_attr,
				  struct ib_udata *udata)
{
	struct mlx4_ib_dev *dev = to_mdev(pd->device);
	struct mlx4_ib_srq *srq;
	struct mlx4_wqe_srq_next_seg *next;
	struct mlx4_wqe_data_seg *scatter;
	u32 cqn;
	u16 xrcdn;
	int desc_size;
	int buf_size;
	int err;
	int i;

	/* Sanity check SRQ size before proceeding */
	if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
	    init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
		return ERR_PTR(-EINVAL);

	srq = kmalloc(sizeof *srq, GFP_KERNEL);
	if (!srq)
		return ERR_PTR(-ENOMEM);

	mutex_init(&srq->mutex);
	spin_lock_init(&srq->lock);
	srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
	srq->msrq.max_gs = init_attr->attr.max_sge;

	desc_size = max(32UL,
			roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
					   srq->msrq.max_gs *
					   sizeof (struct mlx4_wqe_data_seg)));
	srq->msrq.wqe_shift = ilog2(desc_size);

	buf_size = srq->msrq.max * desc_size;

	if (pd->uobject) {
		struct mlx4_ib_create_srq ucmd;

		if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
			err = -EFAULT;
			goto err_srq;
		}

		srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
					buf_size, 0, 0);
		if (IS_ERR(srq->umem)) {
			err = PTR_ERR(srq->umem);
			goto err_srq;
		}

		err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
				    ilog2(srq->umem->page_size), &srq->mtt);
		if (err)
			goto err_buf;

		err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
		if (err)
			goto err_mtt;

		err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
					  ucmd.db_addr, &srq->db);
		if (err)
			goto err_mtt;
	} else {
		err = mlx4_db_alloc(dev->dev, &srq->db, 0, GFP_KERNEL);
		if (err)
			goto err_srq;

		*srq->db.db = 0;

		if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf,
				   GFP_KERNEL)) {
			err = -ENOMEM;
			goto err_db;
		}

		srq->head    = 0;
		srq->tail    = srq->msrq.max - 1;
		srq->wqe_ctr = 0;

		for (i = 0; i < srq->msrq.max; ++i) {
			next = get_wqe(srq, i);
			next->next_wqe_index =
				cpu_to_be16((i + 1) & (srq->msrq.max - 1));

			for (scatter = (void *) (next + 1);
			     (void *) scatter < (void *) next + desc_size;
			     ++scatter)
				scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
		}

		err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
				    &srq->mtt);
		if (err)
			goto err_buf;

		err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf, GFP_KERNEL);
		if (err)
			goto err_mtt;

		srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
		if (!srq->wrid) {
			err = -ENOMEM;
			goto err_mtt;
		}
	}

	cqn = (init_attr->srq_type == IB_SRQT_XRC) ?
		to_mcq(init_attr->ext.xrc.cq)->mcq.cqn : 0;
	xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
		to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
		(u16) dev->dev->caps.reserved_xrcds;
	err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
			     srq->db.dma, &srq->msrq);
	if (err)
		goto err_wrid;

	srq->msrq.event = mlx4_ib_srq_event;
	srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;

	if (pd->uobject)
		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
			err = -EFAULT;
			goto err_wrid;
		}

	init_attr->attr.max_wr = srq->msrq.max - 1;

	return &srq->ibsrq;

err_wrid:
	if (pd->uobject)
		mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
	else
		kfree(srq->wrid);

err_mtt:
	mlx4_mtt_cleanup(dev->dev, &srq->mtt);

err_buf:
	if (pd->uobject)
		ib_umem_release(srq->umem);
	else
		mlx4_buf_free(dev->dev, buf_size, &srq->buf);

err_db:
	if (!pd->uobject)
		mlx4_db_free(dev->dev, &srq->db);

err_srq:
	kfree(srq);

	return ERR_PTR(err);
}

int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
		       enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
{
	struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
	struct mlx4_ib_srq *srq = to_msrq(ibsrq);
	int ret;

	/* We don't support resizing SRQs (yet?) */
	if (attr_mask & IB_SRQ_MAX_WR)
		return -EINVAL;

	if (attr_mask & IB_SRQ_LIMIT) {
		if (attr->srq_limit >= srq->msrq.max)
			return -EINVAL;

		mutex_lock(&srq->mutex);
		ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
		mutex_unlock(&srq->mutex);

		if (ret)
			return ret;
	}

	return 0;
}

int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
{
	struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
	struct mlx4_ib_srq *srq = to_msrq(ibsrq);
	int ret;
	int limit_watermark;

	ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
	if (ret)
		return ret;

	srq_attr->srq_limit = limit_watermark;
	srq_attr->max_wr    = srq->msrq.max - 1;
	srq_attr->max_sge   = srq->msrq.max_gs;

	return 0;
}

int mlx4_ib_destroy_srq(struct ib_srq *srq)
{
	struct mlx4_ib_dev *dev = to_mdev(srq->device);
	struct mlx4_ib_srq *msrq = to_msrq(srq);

	mlx4_srq_free(dev->dev, &msrq->msrq);
	mlx4_mtt_cleanup(dev->dev, &msrq->mtt);

	if (srq->uobject) {
		mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
		ib_umem_release(msrq->umem);
	} else {
		kfree(msrq->wrid);
		mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
			      &msrq->buf);
		mlx4_db_free(dev->dev, &msrq->db);
	}

	kfree(msrq);

	return 0;
}

void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
{
	struct mlx4_wqe_srq_next_seg *next;

	/* always called with interrupts disabled. */
	spin_lock(&srq->lock);

	next = get_wqe(srq, srq->tail);
	next->next_wqe_index = cpu_to_be16(wqe_index);
	srq->tail = wqe_index;

	spin_unlock(&srq->lock);
}

int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
			  struct ib_recv_wr **bad_wr)
{
	struct mlx4_ib_srq *srq = to_msrq(ibsrq);
	struct mlx4_wqe_srq_next_seg *next;
	struct mlx4_wqe_data_seg *scat;
	unsigned long flags;
	int err = 0;
	int nreq;
	int i;

	spin_lock_irqsave(&srq->lock, flags);

	for (nreq = 0; wr; ++nreq, wr = wr->next) {
		if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
			err = -EINVAL;
			*bad_wr = wr;
			break;
		}

		if (unlikely(srq->head == srq->tail)) {
			err = -ENOMEM;
			*bad_wr = wr;
			break;
		}

		srq->wrid[srq->head] = wr->wr_id;

		next      = get_wqe(srq, srq->head);
		srq->head = be16_to_cpu(next->next_wqe_index);
		scat      = (struct mlx4_wqe_data_seg *) (next + 1);

		for (i = 0; i < wr->num_sge; ++i) {
			scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
			scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
			scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
		}

		if (i < srq->msrq.max_gs) {
			scat[i].byte_count = 0;
			scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
			scat[i].addr       = 0;
		}
	}

	if (likely(nreq)) {
		srq->wqe_ctr += nreq;

		/*
		 * Make sure that descriptors are written before
		 * doorbell record.
		 */
		wmb();

		*srq->db.db = cpu_to_be32(srq->wqe_ctr);
	}

	spin_unlock_irqrestore(&srq->lock, flags);

	return err;
}
Commit	Line	Data
225c7b1f RD	1	/*
225c7b1f RD	2	* Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
51a379d0	3	* Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
225c7b1f RD	4	*
	5	* This software is available to you under a choice of one of two
	6	* licenses. You may choose to be licensed under the terms of the GNU
	7	* General Public License (GPL) Version 2, available from the file
	8	* COPYING in the main directory of this source tree, or the
	9	* OpenIB.org BSD license below:
	10	*
	11	* Redistribution and use in source and binary forms, with or
	12	* without modification, are permitted provided that the following
	13	* conditions are met:
	14	*
	15	* - Redistributions of source code must retain the above
	16	* copyright notice, this list of conditions and the following
	17	* disclaimer.
	18	*
	19	* - Redistributions in binary form must reproduce the above
	20	* copyright notice, this list of conditions and the following
	21	* disclaimer in the documentation and/or other materials
	22	* provided with the distribution.
	23	*
	24	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	25	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	26	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	27	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	28	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	29	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	30	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	31	* SOFTWARE.
	32	*/
	33
	34	#include <linux/mlx4/qp.h>
	35	#include <linux/mlx4/srq.h>
5a0e3ad6	36	#include <linux/slab.h>
225c7b1f RD	37
	38	#include "mlx4_ib.h"
	39	#include "user.h"
	40
	41	static void get_wqe(struct mlx4_ib_srq srq, int n)
	42	{
1c69fc2a	43	return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
225c7b1f RD	44	}
	45
	46	static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
	47	{
	48	struct ib_event event;
	49	struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
	50
	51	if (ibsrq->event_handler) {
	52	event.device = ibsrq->device;
	53	event.element.srq = ibsrq;
	54	switch (type) {
	55	case MLX4_EVENT_TYPE_SRQ_LIMIT:
	56	event.event = IB_EVENT_SRQ_LIMIT_REACHED;
	57	break;
	58	case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
	59	event.event = IB_EVENT_SRQ_ERR;
	60	break;
	61	default:
987c8f8f	62	pr_warn("Unexpected event type %d "
225c7b1f RD	63	"on SRQ %06x\n", type, srq->srqn);
	64	return;
	65	}
	66
	67	ibsrq->event_handler(&event, ibsrq->srq_context);
	68	}
	69	}
	70
	71	struct ib_srq mlx4_ib_create_srq(struct ib_pd pd,
	72	struct ib_srq_init_attr *init_attr,
	73	struct ib_udata *udata)
	74	{
	75	struct mlx4_ib_dev *dev = to_mdev(pd->device);
	76	struct mlx4_ib_srq *srq;
	77	struct mlx4_wqe_srq_next_seg *next;
4c425588	78	struct mlx4_wqe_data_seg *scatter;
18abd5ea SH	79	u32 cqn;
18abd5ea SH	80	u16 xrcdn;
225c7b1f RD	81	int desc_size;
	82	int buf_size;
	83	int err;
	84	int i;
	85
	86	/* Sanity check SRQ size before proceeding */
	87	if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes \|\|
	88	init_attr->attr.max_sge > dev->dev->caps.max_srq_sge)
	89	return ERR_PTR(-EINVAL);
	90
	91	srq = kmalloc(sizeof *srq, GFP_KERNEL);
	92	if (!srq)
	93	return ERR_PTR(-ENOMEM);
	94
	95	mutex_init(&srq->mutex);
	96	spin_lock_init(&srq->lock);
	97	srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
	98	srq->msrq.max_gs = init_attr->attr.max_sge;
	99
	100	desc_size = max(32UL,
	101	roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
	102	srq->msrq.max_gs *
	103	sizeof (struct mlx4_wqe_data_seg)));
	104	srq->msrq.wqe_shift = ilog2(desc_size);
	105
	106	buf_size = srq->msrq.max * desc_size;
	107
	108	if (pd->uobject) {
	109	struct mlx4_ib_create_srq ucmd;
	110
	111	if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
	112	err = -EFAULT;
	113	goto err_srq;
	114	}
	115
	116	srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
cb9fbc5c	117	buf_size, 0, 0);
225c7b1f RD	118	if (IS_ERR(srq->umem)) {
	119	err = PTR_ERR(srq->umem);
	120	goto err_srq;
	121	}
	122
	123	err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
	124	ilog2(srq->umem->page_size), &srq->mtt);
	125	if (err)
	126	goto err_buf;
	127
	128	err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
	129	if (err)
	130	goto err_mtt;
	131
	132	err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
	133	ucmd.db_addr, &srq->db);
	134	if (err)
	135	goto err_mtt;
	136	} else {
40f2287b	137	err = mlx4_db_alloc(dev->dev, &srq->db, 0, GFP_KERNEL);
225c7b1f RD	138	if (err)
	139	goto err_srq;
	140
	141	*srq->db.db = 0;
	142
40f2287b JK	143	if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf,
40f2287b JK	144	GFP_KERNEL)) {
225c7b1f RD	145	err = -ENOMEM;
	146	goto err_db;
	147	}
	148
	149	srq->head = 0;
	150	srq->tail = srq->msrq.max - 1;
	151	srq->wqe_ctr = 0;
	152
	153	for (i = 0; i < srq->msrq.max; ++i) {
	154	next = get_wqe(srq, i);
	155	next->next_wqe_index =
	156	cpu_to_be16((i + 1) & (srq->msrq.max - 1));
4c425588 JM	157
	158	for (scatter = (void *) (next + 1);
	159	(void ) scatter < (void ) next + desc_size;
	160	++scatter)
	161	scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
225c7b1f RD	162	}
	163
	164	err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
	165	&srq->mtt);
	166	if (err)
	167	goto err_buf;
	168
40f2287b	169	err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf, GFP_KERNEL);
225c7b1f RD	170	if (err)
	171	goto err_mtt;
	172
	173	srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
	174	if (!srq->wrid) {
	175	err = -ENOMEM;
	176	goto err_mtt;
	177	}
	178	}
	179
18abd5ea SH	180	cqn = (init_attr->srq_type == IB_SRQT_XRC) ?
	181	to_mcq(init_attr->ext.xrc.cq)->mcq.cqn : 0;
	182	xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
	183	to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
	184	(u16) dev->dev->caps.reserved_xrcds;
	185	err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
225c7b1f RD	186	srq->db.dma, &srq->msrq);
	187	if (err)
	188	goto err_wrid;
	189
	190	srq->msrq.event = mlx4_ib_srq_event;
18abd5ea	191	srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
225c7b1f RD	192
	193	if (pd->uobject)
	194	if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
	195	err = -EFAULT;
	196	goto err_wrid;
	197	}
	198
	199	init_attr->attr.max_wr = srq->msrq.max - 1;
	200
	201	return &srq->ibsrq;
	202
	203	err_wrid:
	204	if (pd->uobject)
	205	mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
	206	else
	207	kfree(srq->wrid);
	208
	209	err_mtt:
	210	mlx4_mtt_cleanup(dev->dev, &srq->mtt);
	211
	212	err_buf:
	213	if (pd->uobject)
	214	ib_umem_release(srq->umem);
	215	else
	216	mlx4_buf_free(dev->dev, buf_size, &srq->buf);
	217
	218	err_db:
	219	if (!pd->uobject)
6296883c	220	mlx4_db_free(dev->dev, &srq->db);
225c7b1f RD	221
	222	err_srq:
	223	kfree(srq);
	224
	225	return ERR_PTR(err);
	226	}
	227
	228	int mlx4_ib_modify_srq(struct ib_srq ibsrq, struct ib_srq_attr attr,
	229	enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
	230	{
	231	struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
	232	struct mlx4_ib_srq *srq = to_msrq(ibsrq);
	233	int ret;
	234
	235	/* We don't support resizing SRQs (yet?) */
	236	if (attr_mask & IB_SRQ_MAX_WR)
	237	return -EINVAL;
	238
	239	if (attr_mask & IB_SRQ_LIMIT) {
	240	if (attr->srq_limit >= srq->msrq.max)
	241	return -EINVAL;
	242
	243	mutex_lock(&srq->mutex);
	244	ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
	245	mutex_unlock(&srq->mutex);
	246
	247	if (ret)
	248	return ret;
	249	}
	250
	251	return 0;
	252	}
	253
65541cb7 JM	254	int mlx4_ib_query_srq(struct ib_srq ibsrq, struct ib_srq_attr srq_attr)
	255	{
	256	struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
	257	struct mlx4_ib_srq *srq = to_msrq(ibsrq);
	258	int ret;
	259	int limit_watermark;
	260
	261	ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
	262	if (ret)
	263	return ret;
	264
d7dc3ccb	265	srq_attr->srq_limit = limit_watermark;
65541cb7 JM	266	srq_attr->max_wr = srq->msrq.max - 1;
	267	srq_attr->max_sge = srq->msrq.max_gs;
	268
	269	return 0;
	270	}
	271
225c7b1f RD	272	int mlx4_ib_destroy_srq(struct ib_srq *srq)
	273	{
	274	struct mlx4_ib_dev *dev = to_mdev(srq->device);
	275	struct mlx4_ib_srq *msrq = to_msrq(srq);
	276
	277	mlx4_srq_free(dev->dev, &msrq->msrq);
	278	mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
	279
	280	if (srq->uobject) {
	281	mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
	282	ib_umem_release(msrq->umem);
	283	} else {
	284	kfree(msrq->wrid);
	285	mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
	286	&msrq->buf);
6296883c	287	mlx4_db_free(dev->dev, &msrq->db);
225c7b1f RD	288	}
	289
	290	kfree(msrq);
	291
	292	return 0;
	293	}
	294
	295	void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
	296	{
	297	struct mlx4_wqe_srq_next_seg *next;
	298
	299	/* always called with interrupts disabled. */
	300	spin_lock(&srq->lock);
	301
	302	next = get_wqe(srq, srq->tail);
	303	next->next_wqe_index = cpu_to_be16(wqe_index);
	304	srq->tail = wqe_index;
	305
	306	spin_unlock(&srq->lock);
	307	}
	308
	309	int mlx4_ib_post_srq_recv(struct ib_srq ibsrq, struct ib_recv_wr wr,
	310	struct ib_recv_wr **bad_wr)
	311	{
	312	struct mlx4_ib_srq *srq = to_msrq(ibsrq);
	313	struct mlx4_wqe_srq_next_seg *next;
	314	struct mlx4_wqe_data_seg *scat;
	315	unsigned long flags;
	316	int err = 0;
	317	int nreq;
	318	int i;
	319
	320	spin_lock_irqsave(&srq->lock, flags);
	321
	322	for (nreq = 0; wr; ++nreq, wr = wr->next) {
	323	if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
	324	err = -EINVAL;
	325	*bad_wr = wr;
	326	break;
	327	}
	328
56a8c8b6 RD	329	if (unlikely(srq->head == srq->tail)) {
	330	err = -ENOMEM;
	331	*bad_wr = wr;
	332	break;
	333	}
	334
225c7b1f RD	335	srq->wrid[srq->head] = wr->wr_id;
	336
	337	next = get_wqe(srq, srq->head);
	338	srq->head = be16_to_cpu(next->next_wqe_index);
	339	scat = (struct mlx4_wqe_data_seg *) (next + 1);
	340
	341	for (i = 0; i < wr->num_sge; ++i) {
	342	scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
	343	scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
	344	scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
	345	}
	346
	347	if (i < srq->msrq.max_gs) {
	348	scat[i].byte_count = 0;
	349	scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
	350	scat[i].addr = 0;
	351	}
	352	}
	353
	354	if (likely(nreq)) {
	355	srq->wqe_ctr += nreq;
	356
	357	/*
	358	* Make sure that descriptors are written before
	359	* doorbell record.
	360	*/
	361	wmb();
	362
	363	*srq->db.db = cpu_to_be32(srq->wqe_ctr);
	364	}
	365
	366	spin_unlock_irqrestore(&srq->lock, flags);
	367
	368	return err;
	369	}