[mirror_ubuntu-hirsute-kernel.git] / drivers / infiniband / hw / mlx5 / srq.c

/*
 * 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/module.h>
#include <linux/mlx5/qp.h>
#include <linux/mlx5/srq.h>
#include <linux/slab.h>
#include <rdma/ib_umem.h>

#include "mlx5_ib.h"
#include "user.h"

/* not supported currently */
static int srq_signature;

static void *get_wqe(struct mlx5_ib_srq *srq, int n)
{
	return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
}

static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_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 MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
			event.event = IB_EVENT_SRQ_LIMIT_REACHED;
			break;
		case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
			event.event = IB_EVENT_SRQ_ERR;
			break;
		default:
			pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
				type, srq->srqn);
			return;
		}

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

static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
			   struct mlx5_create_srq_mbox_in **in,
			   struct ib_udata *udata, int buf_size, int *inlen)
{
	struct mlx5_ib_dev *dev = to_mdev(pd->device);
	struct mlx5_ib_create_srq ucmd;
	int err;
	int npages;
	int page_shift;
	int ncont;
	u32 offset;

	if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
		mlx5_ib_dbg(dev, "failed copy udata\n");
		return -EFAULT;
	}
	srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);

	srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
				0, 0);
	if (IS_ERR(srq->umem)) {
		mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
		err = PTR_ERR(srq->umem);
		return err;
	}

	mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
			   &page_shift, &ncont, NULL);
	err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
				     &offset);
	if (err) {
		mlx5_ib_warn(dev, "bad offset\n");
		goto err_umem;
	}

	*inlen = sizeof(**in) + sizeof(*(*in)->pas) * ncont;
	*in = mlx5_vzalloc(*inlen);
	if (!(*in)) {
		err = -ENOMEM;
		goto err_umem;
	}

	mlx5_ib_populate_pas(dev, srq->umem, page_shift, (*in)->pas, 0);

	err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
				  ucmd.db_addr, &srq->db);
	if (err) {
		mlx5_ib_dbg(dev, "map doorbell failed\n");
		goto err_in;
	}

	(*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
	(*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26);

	return 0;

err_in:
	mlx5_vfree(*in);

err_umem:
	ib_umem_release(srq->umem);

	return err;
}

static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
			     struct mlx5_create_srq_mbox_in **in, int buf_size,
			     int *inlen)
{
	int err;
	int i;
	struct mlx5_wqe_srq_next_seg *next;
	int page_shift;
	int npages;

	err = mlx5_db_alloc(&dev->mdev, &srq->db);
	if (err) {
		mlx5_ib_warn(dev, "alloc dbell rec failed\n");
		return err;
	}

	*srq->db.db = 0;

	if (mlx5_buf_alloc(&dev->mdev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
		mlx5_ib_dbg(dev, "buf alloc failed\n");
		err = -ENOMEM;
		goto err_db;
	}
	page_shift = srq->buf.page_shift;

	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));
	}

	npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
	mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
		    buf_size, page_shift, srq->buf.npages, npages);
	*inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages;
	*in = mlx5_vzalloc(*inlen);
	if (!*in) {
		err = -ENOMEM;
		goto err_buf;
	}
	mlx5_fill_page_array(&srq->buf, (*in)->pas);

	srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
	if (!srq->wrid) {
		mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
			    (unsigned long)(srq->msrq.max * sizeof(u64)));
		err = -ENOMEM;
		goto err_in;
	}
	srq->wq_sig = !!srq_signature;

	(*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;

	return 0;

err_in:
	mlx5_vfree(*in);

err_buf:
	mlx5_buf_free(&dev->mdev, &srq->buf);

err_db:
	mlx5_db_free(&dev->mdev, &srq->db);
	return err;
}

static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
{
	mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
	ib_umem_release(srq->umem);
}


static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
{
	kfree(srq->wrid);
	mlx5_buf_free(&dev->mdev, &srq->buf);
	mlx5_db_free(&dev->mdev, &srq->db);
}

struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
				  struct ib_srq_init_attr *init_attr,
				  struct ib_udata *udata)
{
	struct mlx5_ib_dev *dev = to_mdev(pd->device);
	struct mlx5_ib_srq *srq;
	int desc_size;
	int buf_size;
	int err;
	struct mlx5_create_srq_mbox_in *uninitialized_var(in);
	int uninitialized_var(inlen);
	int is_xrc;
	u32 flgs, xrcdn;

	/* Sanity check SRQ size before proceeding */
	if (init_attr->attr.max_wr >= dev->mdev.caps.max_srq_wqes) {
		mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
			    init_attr->attr.max_wr,
			    dev->mdev.caps.max_srq_wqes);
		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 = sizeof(struct mlx5_wqe_srq_next_seg) +
		    srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
	desc_size = roundup_pow_of_two(desc_size);
	desc_size = max_t(int, 32, desc_size);
	srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
		sizeof(struct mlx5_wqe_data_seg);
	srq->msrq.wqe_shift = ilog2(desc_size);
	buf_size = srq->msrq.max * desc_size;
	mlx5_ib_dbg(dev, "desc_size 0x%x, req wr 0x%x, srq size 0x%x, max_gs 0x%x, max_avail_gather 0x%x\n",
		    desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
		    srq->msrq.max_avail_gather);

	if (pd->uobject)
		err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen);
	else
		err = create_srq_kernel(dev, srq, &in, buf_size, &inlen);

	if (err) {
		mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
			     pd->uobject ? "user" : "kernel", err);
		goto err_srq;
	}

	is_xrc = (init_attr->srq_type == IB_SRQT_XRC);
	in->ctx.state_log_sz = ilog2(srq->msrq.max);
	flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24;
	xrcdn = 0;
	if (is_xrc) {
		xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
		in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn);
	} else if (init_attr->srq_type == IB_SRQT_BASIC) {
		xrcdn = to_mxrcd(dev->devr.x0)->xrcdn;
		in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn);
	}

	in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF));

	in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn);
	in->ctx.db_record = cpu_to_be64(srq->db.dma);
	err = mlx5_core_create_srq(&dev->mdev, &srq->msrq, in, inlen);
	mlx5_vfree(in);
	if (err) {
		mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
		goto err_usr_kern_srq;
	}

	mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);

	srq->msrq.event = mlx5_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))) {
			mlx5_ib_dbg(dev, "copy to user failed\n");
			err = -EFAULT;
			goto err_core;
		}

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

	return &srq->ibsrq;

err_core:
	mlx5_core_destroy_srq(&dev->mdev, &srq->msrq);

err_usr_kern_srq:
	if (pd->uobject)
		destroy_srq_user(pd, srq);
	else
		destroy_srq_kernel(dev, srq);

err_srq:
	kfree(srq);

	return ERR_PTR(err);
}

int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
		       enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
{
	struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
	struct mlx5_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 = mlx5_core_arm_srq(&dev->mdev, &srq->msrq, attr->srq_limit, 1);
		mutex_unlock(&srq->mutex);

		if (ret)
			return ret;
	}

	return 0;
}

int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
{
	struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
	struct mlx5_ib_srq *srq = to_msrq(ibsrq);
	int ret;
	struct mlx5_query_srq_mbox_out *out;

	out = kzalloc(sizeof(*out), GFP_KERNEL);
	if (!out)
		return -ENOMEM;

	ret = mlx5_core_query_srq(&dev->mdev, &srq->msrq, out);
	if (ret)
		goto out_box;

	srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm);
	srq_attr->max_wr    = srq->msrq.max - 1;
	srq_attr->max_sge   = srq->msrq.max_gs;

out_box:
	kfree(out);
	return ret;
}

int mlx5_ib_destroy_srq(struct ib_srq *srq)
{
	struct mlx5_ib_dev *dev = to_mdev(srq->device);
	struct mlx5_ib_srq *msrq = to_msrq(srq);

	mlx5_core_destroy_srq(&dev->mdev, &msrq->msrq);

	if (srq->uobject) {
		mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
		ib_umem_release(msrq->umem);
	} else {
		destroy_srq_kernel(dev, msrq);
	}

	kfree(srq);
	return 0;
}

void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
{
	struct mlx5_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 mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
			  struct ib_recv_wr **bad_wr)
{
	struct mlx5_ib_srq *srq = to_msrq(ibsrq);
	struct mlx5_wqe_srq_next_seg *next;
	struct mlx5_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 mlx5_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_avail_gather) {
			scat[i].byte_count = 0;
			scat[i].lkey       = cpu_to_be32(MLX5_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
e126ba97 EC	1	/*
	2	* Copyright (c) 2013, Mellanox Technologies inc. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*/
	32
	33	#include <linux/module.h>
	34	#include <linux/mlx5/qp.h>
	35	#include <linux/mlx5/srq.h>
	36	#include <linux/slab.h>
	37	#include <rdma/ib_umem.h>
	38
	39	#include "mlx5_ib.h"
	40	#include "user.h"
	41
	42	/* not supported currently */
	43	static int srq_signature;
	44
	45	static void get_wqe(struct mlx5_ib_srq srq, int n)
	46	{
	47	return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
	48	}
	49
	50	static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type)
	51	{
	52	struct ib_event event;
	53	struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
	54
	55	if (ibsrq->event_handler) {
	56	event.device = ibsrq->device;
	57	event.element.srq = ibsrq;
	58	switch (type) {
	59	case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
	60	event.event = IB_EVENT_SRQ_LIMIT_REACHED;
	61	break;
	62	case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
	63	event.event = IB_EVENT_SRQ_ERR;
	64	break;
65	default:
66	pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
67	type, srq->srqn);
68	return;
69	}
70
71	ibsrq->event_handler(&event, ibsrq->srq_context);
72	}
73	}
74
75	static int create_srq_user(struct ib_pd pd, struct mlx5_ib_srq srq,
76	struct mlx5_create_srq_mbox_in **in,
77	struct ib_udata udata, int buf_size, int inlen)
78	{
79	struct mlx5_ib_dev *dev = to_mdev(pd->device);
80	struct mlx5_ib_create_srq ucmd;
81	int err;
82	int npages;
83	int page_shift;
84	int ncont;
85	u32 offset;
86
87	if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
88	mlx5_ib_dbg(dev, "failed copy udata\n");
89	return -EFAULT;
90	}
91	srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
92
93	srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
94	0, 0);
95	if (IS_ERR(srq->umem)) {
96	mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
97	err = PTR_ERR(srq->umem);
98	return err;
99	}
100
101	mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
102	&page_shift, &ncont, NULL);
103	err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
104	&offset);
105	if (err) {
106	mlx5_ib_warn(dev, "bad offset\n");
107	goto err_umem;
108	}
109
110	inlen = sizeof(in) + sizeof((in)->pas) ncont;
111	in = mlx5_vzalloc(inlen);
112	if (!(*in)) {
113	err = -ENOMEM;
114	goto err_umem;
115	}
116
117	mlx5_ib_populate_pas(dev, srq->umem, page_shift, (*in)->pas, 0);
118
119	err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
120	ucmd.db_addr, &srq->db);
121	if (err) {
122	mlx5_ib_dbg(dev, "map doorbell failed\n");
123	goto err_in;
124	}
125
1b77d2bd	126	(*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
e126ba97 EC	127	(*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26);
	128
	129	return 0;
	130
	131	err_in:
	132	mlx5_vfree(*in);
	133
	134	err_umem:
	135	ib_umem_release(srq->umem);
	136
	137	return err;
	138	}
	139
	140	static int create_srq_kernel(struct mlx5_ib_dev dev, struct mlx5_ib_srq srq,
	141	struct mlx5_create_srq_mbox_in **in, int buf_size,
	142	int *inlen)
	143	{
	144	int err;
	145	int i;
	146	struct mlx5_wqe_srq_next_seg *next;
	147	int page_shift;
	148	int npages;
	149
	150	err = mlx5_db_alloc(&dev->mdev, &srq->db);
	151	if (err) {
	152	mlx5_ib_warn(dev, "alloc dbell rec failed\n");
	153	return err;
	154	}
	155
	156	*srq->db.db = 0;
	157
	158	if (mlx5_buf_alloc(&dev->mdev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
	159	mlx5_ib_dbg(dev, "buf alloc failed\n");
	160	err = -ENOMEM;
	161	goto err_db;
	162	}
	163	page_shift = srq->buf.page_shift;
	164
	165	srq->head = 0;
	166	srq->tail = srq->msrq.max - 1;
	167	srq->wqe_ctr = 0;
	168
	169	for (i = 0; i < srq->msrq.max; i++) {
	170	next = get_wqe(srq, i);
	171	next->next_wqe_index =
	172	cpu_to_be16((i + 1) & (srq->msrq.max - 1));
	173	}
	174
	175	npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
	176	mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
	177	buf_size, page_shift, srq->buf.npages, npages);
	178	inlen = sizeof(in) + sizeof((in)->pas) npages;
	179	in = mlx5_vzalloc(inlen);
	180	if (!*in) {
	181	err = -ENOMEM;
	182	goto err_buf;
	183	}
	184	mlx5_fill_page_array(&srq->buf, (*in)->pas);
	185
	186	srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
	187	if (!srq->wrid) {
	188	mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
	189	(unsigned long)(srq->msrq.max * sizeof(u64)));
	190	err = -ENOMEM;
191	goto err_in;
192	}
193	srq->wq_sig = !!srq_signature;
194
1b77d2bd	195	(*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
e126ba97 EC	196
	197	return 0;
	198
	199	err_in:
	200	mlx5_vfree(*in);
	201
	202	err_buf:
	203	mlx5_buf_free(&dev->mdev, &srq->buf);
	204
	205	err_db:
	206	mlx5_db_free(&dev->mdev, &srq->db);
	207	return err;
	208	}
	209
	210	static void destroy_srq_user(struct ib_pd pd, struct mlx5_ib_srq srq)
	211	{
	212	mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
	213	ib_umem_release(srq->umem);
	214	}
	215
	216
	217	static void destroy_srq_kernel(struct mlx5_ib_dev dev, struct mlx5_ib_srq srq)
	218	{
	219	kfree(srq->wrid);
	220	mlx5_buf_free(&dev->mdev, &srq->buf);
	221	mlx5_db_free(&dev->mdev, &srq->db);
	222	}
	223
	224	struct ib_srq mlx5_ib_create_srq(struct ib_pd pd,
	225	struct ib_srq_init_attr *init_attr,
	226	struct ib_udata *udata)
	227	{
	228	struct mlx5_ib_dev *dev = to_mdev(pd->device);
	229	struct mlx5_ib_srq *srq;
	230	int desc_size;
	231	int buf_size;
	232	int err;
	233	struct mlx5_create_srq_mbox_in *uninitialized_var(in);
	234	int uninitialized_var(inlen);
	235	int is_xrc;
	236	u32 flgs, xrcdn;
	237
	238	/* Sanity check SRQ size before proceeding */
	239	if (init_attr->attr.max_wr >= dev->mdev.caps.max_srq_wqes) {
	240	mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
	241	init_attr->attr.max_wr,
	242	dev->mdev.caps.max_srq_wqes);
	243	return ERR_PTR(-EINVAL);
	244	}
	245
	246	srq = kmalloc(sizeof(*srq), GFP_KERNEL);
	247	if (!srq)
	248	return ERR_PTR(-ENOMEM);
	249
	250	mutex_init(&srq->mutex);
	251	spin_lock_init(&srq->lock);
	252	srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
	253	srq->msrq.max_gs = init_attr->attr.max_sge;
	254
	255	desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
	256	srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
	257	desc_size = roundup_pow_of_two(desc_size);
	258	desc_size = max_t(int, 32, desc_size);
	259	srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
260	sizeof(struct mlx5_wqe_data_seg);
261	srq->msrq.wqe_shift = ilog2(desc_size);
262	buf_size = srq->msrq.max * desc_size;
263	mlx5_ib_dbg(dev, "desc_size 0x%x, req wr 0x%x, srq size 0x%x, max_gs 0x%x, max_avail_gather 0x%x\n",
264	desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
265	srq->msrq.max_avail_gather);
266
267	if (pd->uobject)
268	err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen);
269	else
270	err = create_srq_kernel(dev, srq, &in, buf_size, &inlen);
271
272	if (err) {
273	mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
274	pd->uobject ? "user" : "kernel", err);
275	goto err_srq;
276	}
277
278	is_xrc = (init_attr->srq_type == IB_SRQT_XRC);
279	in->ctx.state_log_sz = ilog2(srq->msrq.max);
280	flgs = ((srq->msrq.wqe_shift - 4) \| (is_xrc << 5) \| (srq->wq_sig << 7)) << 24;
281	xrcdn = 0;
282	if (is_xrc) {
283	xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
284	in->ctx.pgoff_cqn \|= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn);
285	} else if (init_attr->srq_type == IB_SRQT_BASIC) {
286	xrcdn = to_mxrcd(dev->devr.x0)->xrcdn;
287	in->ctx.pgoff_cqn \|= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn);
288	}
289
290	in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) \| (xrcdn & 0xFFFFFF));
291
292	in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn);
293	in->ctx.db_record = cpu_to_be64(srq->db.dma);
294	err = mlx5_core_create_srq(&dev->mdev, &srq->msrq, in, inlen);
295	mlx5_vfree(in);
296	if (err) {
297	mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
56e1ab0f	298	goto err_usr_kern_srq;
e126ba97 EC	299	}
	300
	301	mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
	302
	303	srq->msrq.event = mlx5_ib_srq_event;
	304	srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
	305
	306	if (pd->uobject)
	307	if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
	308	mlx5_ib_dbg(dev, "copy to user failed\n");
	309	err = -EFAULT;
	310	goto err_core;
	311	}
	312
	313	init_attr->attr.max_wr = srq->msrq.max - 1;
	314
	315	return &srq->ibsrq;
	316
	317	err_core:
	318	mlx5_core_destroy_srq(&dev->mdev, &srq->msrq);
56e1ab0f ML	319
56e1ab0f ML	320	err_usr_kern_srq:
e126ba97 EC	321	if (pd->uobject)
	322	destroy_srq_user(pd, srq);
	323	else
	324	destroy_srq_kernel(dev, srq);
	325
	326	err_srq:
	327	kfree(srq);
	328
	329	return ERR_PTR(err);
	330	}
	331
	332	int mlx5_ib_modify_srq(struct ib_srq ibsrq, struct ib_srq_attr attr,
	333	enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
	334	{
	335	struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
	336	struct mlx5_ib_srq *srq = to_msrq(ibsrq);
	337	int ret;
	338
	339	/* We don't support resizing SRQs yet */
	340	if (attr_mask & IB_SRQ_MAX_WR)
	341	return -EINVAL;
	342
	343	if (attr_mask & IB_SRQ_LIMIT) {
	344	if (attr->srq_limit >= srq->msrq.max)
	345	return -EINVAL;
	346
	347	mutex_lock(&srq->mutex);
	348	ret = mlx5_core_arm_srq(&dev->mdev, &srq->msrq, attr->srq_limit, 1);
	349	mutex_unlock(&srq->mutex);
	350
	351	if (ret)
	352	return ret;
	353	}
	354
	355	return 0;
	356	}
	357
	358	int mlx5_ib_query_srq(struct ib_srq ibsrq, struct ib_srq_attr srq_attr)
	359	{
	360	struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
	361	struct mlx5_ib_srq *srq = to_msrq(ibsrq);
	362	int ret;
	363	struct mlx5_query_srq_mbox_out *out;
	364
	365	out = kzalloc(sizeof(*out), GFP_KERNEL);
	366	if (!out)
	367	return -ENOMEM;
	368
	369	ret = mlx5_core_query_srq(&dev->mdev, &srq->msrq, out);
	370	if (ret)
	371	goto out_box;
	372
	373	srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm);
	374	srq_attr->max_wr = srq->msrq.max - 1;
	375	srq_attr->max_sge = srq->msrq.max_gs;
	376
	377	out_box:
	378	kfree(out);
	379	return ret;
	380	}
	381
	382	int mlx5_ib_destroy_srq(struct ib_srq *srq)
	383	{
	384	struct mlx5_ib_dev *dev = to_mdev(srq->device);
385	struct mlx5_ib_srq *msrq = to_msrq(srq);
386
387	mlx5_core_destroy_srq(&dev->mdev, &msrq->msrq);
388
389	if (srq->uobject) {
390	mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
391	ib_umem_release(msrq->umem);
392	} else {
1faacf82	393	destroy_srq_kernel(dev, msrq);
e126ba97 EC	394	}
	395
	396	kfree(srq);
	397	return 0;
	398	}
	399
	400	void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
	401	{
	402	struct mlx5_wqe_srq_next_seg *next;
	403
	404	/* always called with interrupts disabled. */
	405	spin_lock(&srq->lock);
	406
	407	next = get_wqe(srq, srq->tail);
	408	next->next_wqe_index = cpu_to_be16(wqe_index);
	409	srq->tail = wqe_index;
	410
	411	spin_unlock(&srq->lock);
	412	}
	413
	414	int mlx5_ib_post_srq_recv(struct ib_srq ibsrq, struct ib_recv_wr wr,
	415	struct ib_recv_wr **bad_wr)
	416	{
	417	struct mlx5_ib_srq *srq = to_msrq(ibsrq);
	418	struct mlx5_wqe_srq_next_seg *next;
	419	struct mlx5_wqe_data_seg *scat;
	420	unsigned long flags;
	421	int err = 0;
	422	int nreq;
	423	int i;
	424
	425	spin_lock_irqsave(&srq->lock, flags);
	426
	427	for (nreq = 0; wr; nreq++, wr = wr->next) {
	428	if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
	429	err = -EINVAL;
	430	*bad_wr = wr;
	431	break;
	432	}
	433
	434	if (unlikely(srq->head == srq->tail)) {
	435	err = -ENOMEM;
	436	*bad_wr = wr;
	437	break;
	438	}
	439
	440	srq->wrid[srq->head] = wr->wr_id;
	441
	442	next = get_wqe(srq, srq->head);
	443	srq->head = be16_to_cpu(next->next_wqe_index);
	444	scat = (struct mlx5_wqe_data_seg *)(next + 1);
	445
	446	for (i = 0; i < wr->num_sge; i++) {
	447	scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
	448	scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
	449	scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
	450	}
	451
	452	if (i < srq->msrq.max_avail_gather) {
	453	scat[i].byte_count = 0;
	454	scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY);
	455	scat[i].addr = 0;
	456	}
	457	}
458
459	if (likely(nreq)) {
460	srq->wqe_ctr += nreq;
461
462	/* Make sure that descriptors are written before
463	* doorbell record.
464	*/
465	wmb();
466
467	*srq->db.db = cpu_to_be32(srq->wqe_ctr);
468	}
469
470	spin_unlock_irqrestore(&srq->lock, flags);
471
472	return err;
473	}