2 * Copyright (c) 2013, Mellanox Technologies inc. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
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 #include <rdma/ib_user_verbs.h>
43 /* not supported currently */
44 static int srq_signature
;
46 static void *get_wqe(struct mlx5_ib_srq
*srq
, int n
)
48 return mlx5_buf_offset(&srq
->buf
, n
<< srq
->msrq
.wqe_shift
);
51 static void mlx5_ib_srq_event(struct mlx5_core_srq
*srq
, enum mlx5_event type
)
53 struct ib_event event
;
54 struct ib_srq
*ibsrq
= &to_mibsrq(srq
)->ibsrq
;
56 if (ibsrq
->event_handler
) {
57 event
.device
= ibsrq
->device
;
58 event
.element
.srq
= ibsrq
;
60 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT
:
61 event
.event
= IB_EVENT_SRQ_LIMIT_REACHED
;
63 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR
:
64 event
.event
= IB_EVENT_SRQ_ERR
;
67 pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
72 ibsrq
->event_handler(&event
, ibsrq
->srq_context
);
76 static int create_srq_user(struct ib_pd
*pd
, struct mlx5_ib_srq
*srq
,
77 struct mlx5_create_srq_mbox_in
**in
,
78 struct ib_udata
*udata
, int buf_size
, int *inlen
)
80 struct mlx5_ib_dev
*dev
= to_mdev(pd
->device
);
81 struct mlx5_ib_create_srq ucmd
;
90 (udata
->inlen
- sizeof(struct ib_uverbs_cmd_hdr
) <
91 sizeof(ucmd
)) ? (sizeof(ucmd
) -
92 sizeof(ucmd
.reserved
)) : sizeof(ucmd
);
94 if (ib_copy_from_udata(&ucmd
, udata
, ucmdlen
)) {
95 mlx5_ib_dbg(dev
, "failed copy udata\n");
99 if (ucmdlen
== sizeof(ucmd
) &&
103 srq
->wq_sig
= !!(ucmd
.flags
& MLX5_SRQ_FLAG_SIGNATURE
);
105 srq
->umem
= ib_umem_get(pd
->uobject
->context
, ucmd
.buf_addr
, buf_size
,
107 if (IS_ERR(srq
->umem
)) {
108 mlx5_ib_dbg(dev
, "failed umem get, size %d\n", buf_size
);
109 err
= PTR_ERR(srq
->umem
);
113 mlx5_ib_cont_pages(srq
->umem
, ucmd
.buf_addr
, &npages
,
114 &page_shift
, &ncont
, NULL
);
115 err
= mlx5_ib_get_buf_offset(ucmd
.buf_addr
, page_shift
,
118 mlx5_ib_warn(dev
, "bad offset\n");
122 *inlen
= sizeof(**in
) + sizeof(*(*in
)->pas
) * ncont
;
123 *in
= mlx5_vzalloc(*inlen
);
129 mlx5_ib_populate_pas(dev
, srq
->umem
, page_shift
, (*in
)->pas
, 0);
131 err
= mlx5_ib_db_map_user(to_mucontext(pd
->uobject
->context
),
132 ucmd
.db_addr
, &srq
->db
);
134 mlx5_ib_dbg(dev
, "map doorbell failed\n");
138 (*in
)->ctx
.log_pg_sz
= page_shift
- MLX5_ADAPTER_PAGE_SHIFT
;
139 (*in
)->ctx
.pgoff_cqn
= cpu_to_be32(offset
<< 26);
147 ib_umem_release(srq
->umem
);
152 static int create_srq_kernel(struct mlx5_ib_dev
*dev
, struct mlx5_ib_srq
*srq
,
153 struct mlx5_create_srq_mbox_in
**in
, int buf_size
,
158 struct mlx5_wqe_srq_next_seg
*next
;
162 err
= mlx5_db_alloc(dev
->mdev
, &srq
->db
);
164 mlx5_ib_warn(dev
, "alloc dbell rec failed\n");
170 if (mlx5_buf_alloc(dev
->mdev
, buf_size
, PAGE_SIZE
* 2, &srq
->buf
)) {
171 mlx5_ib_dbg(dev
, "buf alloc failed\n");
175 page_shift
= srq
->buf
.page_shift
;
178 srq
->tail
= srq
->msrq
.max
- 1;
181 for (i
= 0; i
< srq
->msrq
.max
; i
++) {
182 next
= get_wqe(srq
, i
);
183 next
->next_wqe_index
=
184 cpu_to_be16((i
+ 1) & (srq
->msrq
.max
- 1));
187 npages
= DIV_ROUND_UP(srq
->buf
.npages
, 1 << (page_shift
- PAGE_SHIFT
));
188 mlx5_ib_dbg(dev
, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
189 buf_size
, page_shift
, srq
->buf
.npages
, npages
);
190 *inlen
= sizeof(**in
) + sizeof(*(*in
)->pas
) * npages
;
191 *in
= mlx5_vzalloc(*inlen
);
196 mlx5_fill_page_array(&srq
->buf
, (*in
)->pas
);
198 srq
->wrid
= kmalloc(srq
->msrq
.max
* sizeof(u64
), GFP_KERNEL
);
200 mlx5_ib_dbg(dev
, "kmalloc failed %lu\n",
201 (unsigned long)(srq
->msrq
.max
* sizeof(u64
)));
205 srq
->wq_sig
= !!srq_signature
;
207 (*in
)->ctx
.log_pg_sz
= page_shift
- MLX5_ADAPTER_PAGE_SHIFT
;
215 mlx5_buf_free(dev
->mdev
, &srq
->buf
);
218 mlx5_db_free(dev
->mdev
, &srq
->db
);
222 static void destroy_srq_user(struct ib_pd
*pd
, struct mlx5_ib_srq
*srq
)
224 mlx5_ib_db_unmap_user(to_mucontext(pd
->uobject
->context
), &srq
->db
);
225 ib_umem_release(srq
->umem
);
229 static void destroy_srq_kernel(struct mlx5_ib_dev
*dev
, struct mlx5_ib_srq
*srq
)
232 mlx5_buf_free(dev
->mdev
, &srq
->buf
);
233 mlx5_db_free(dev
->mdev
, &srq
->db
);
236 struct ib_srq
*mlx5_ib_create_srq(struct ib_pd
*pd
,
237 struct ib_srq_init_attr
*init_attr
,
238 struct ib_udata
*udata
)
240 struct mlx5_ib_dev
*dev
= to_mdev(pd
->device
);
241 struct mlx5_general_caps
*gen
;
242 struct mlx5_ib_srq
*srq
;
246 struct mlx5_create_srq_mbox_in
*uninitialized_var(in
);
247 int uninitialized_var(inlen
);
251 gen
= &dev
->mdev
->caps
.gen
;
252 /* Sanity check SRQ size before proceeding */
253 if (init_attr
->attr
.max_wr
>= gen
->max_srq_wqes
) {
254 mlx5_ib_dbg(dev
, "max_wr %d, cap %d\n",
255 init_attr
->attr
.max_wr
,
257 return ERR_PTR(-EINVAL
);
260 srq
= kmalloc(sizeof(*srq
), GFP_KERNEL
);
262 return ERR_PTR(-ENOMEM
);
264 mutex_init(&srq
->mutex
);
265 spin_lock_init(&srq
->lock
);
266 srq
->msrq
.max
= roundup_pow_of_two(init_attr
->attr
.max_wr
+ 1);
267 srq
->msrq
.max_gs
= init_attr
->attr
.max_sge
;
269 desc_size
= sizeof(struct mlx5_wqe_srq_next_seg
) +
270 srq
->msrq
.max_gs
* sizeof(struct mlx5_wqe_data_seg
);
271 desc_size
= roundup_pow_of_two(desc_size
);
272 desc_size
= max_t(int, 32, desc_size
);
273 srq
->msrq
.max_avail_gather
= (desc_size
- sizeof(struct mlx5_wqe_srq_next_seg
)) /
274 sizeof(struct mlx5_wqe_data_seg
);
275 srq
->msrq
.wqe_shift
= ilog2(desc_size
);
276 buf_size
= srq
->msrq
.max
* desc_size
;
277 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",
278 desc_size
, init_attr
->attr
.max_wr
, srq
->msrq
.max
, srq
->msrq
.max_gs
,
279 srq
->msrq
.max_avail_gather
);
282 err
= create_srq_user(pd
, srq
, &in
, udata
, buf_size
, &inlen
);
284 err
= create_srq_kernel(dev
, srq
, &in
, buf_size
, &inlen
);
287 mlx5_ib_warn(dev
, "create srq %s failed, err %d\n",
288 pd
->uobject
? "user" : "kernel", err
);
292 is_xrc
= (init_attr
->srq_type
== IB_SRQT_XRC
);
293 in
->ctx
.state_log_sz
= ilog2(srq
->msrq
.max
);
294 flgs
= ((srq
->msrq
.wqe_shift
- 4) | (is_xrc
<< 5) | (srq
->wq_sig
<< 7)) << 24;
297 xrcdn
= to_mxrcd(init_attr
->ext
.xrc
.xrcd
)->xrcdn
;
298 in
->ctx
.pgoff_cqn
|= cpu_to_be32(to_mcq(init_attr
->ext
.xrc
.cq
)->mcq
.cqn
);
299 } else if (init_attr
->srq_type
== IB_SRQT_BASIC
) {
300 xrcdn
= to_mxrcd(dev
->devr
.x0
)->xrcdn
;
301 in
->ctx
.pgoff_cqn
|= cpu_to_be32(to_mcq(dev
->devr
.c0
)->mcq
.cqn
);
304 in
->ctx
.flags_xrcd
= cpu_to_be32((flgs
& 0xFF000000) | (xrcdn
& 0xFFFFFF));
306 in
->ctx
.pd
= cpu_to_be32(to_mpd(pd
)->pdn
);
307 in
->ctx
.db_record
= cpu_to_be64(srq
->db
.dma
);
308 err
= mlx5_core_create_srq(dev
->mdev
, &srq
->msrq
, in
, inlen
);
311 mlx5_ib_dbg(dev
, "create SRQ failed, err %d\n", err
);
312 goto err_usr_kern_srq
;
315 mlx5_ib_dbg(dev
, "create SRQ with srqn 0x%x\n", srq
->msrq
.srqn
);
317 srq
->msrq
.event
= mlx5_ib_srq_event
;
318 srq
->ibsrq
.ext
.xrc
.srq_num
= srq
->msrq
.srqn
;
321 if (ib_copy_to_udata(udata
, &srq
->msrq
.srqn
, sizeof(__u32
))) {
322 mlx5_ib_dbg(dev
, "copy to user failed\n");
327 init_attr
->attr
.max_wr
= srq
->msrq
.max
- 1;
332 mlx5_core_destroy_srq(dev
->mdev
, &srq
->msrq
);
336 destroy_srq_user(pd
, srq
);
338 destroy_srq_kernel(dev
, srq
);
346 int mlx5_ib_modify_srq(struct ib_srq
*ibsrq
, struct ib_srq_attr
*attr
,
347 enum ib_srq_attr_mask attr_mask
, struct ib_udata
*udata
)
349 struct mlx5_ib_dev
*dev
= to_mdev(ibsrq
->device
);
350 struct mlx5_ib_srq
*srq
= to_msrq(ibsrq
);
353 /* We don't support resizing SRQs yet */
354 if (attr_mask
& IB_SRQ_MAX_WR
)
357 if (attr_mask
& IB_SRQ_LIMIT
) {
358 if (attr
->srq_limit
>= srq
->msrq
.max
)
361 mutex_lock(&srq
->mutex
);
362 ret
= mlx5_core_arm_srq(dev
->mdev
, &srq
->msrq
, attr
->srq_limit
, 1);
363 mutex_unlock(&srq
->mutex
);
372 int mlx5_ib_query_srq(struct ib_srq
*ibsrq
, struct ib_srq_attr
*srq_attr
)
374 struct mlx5_ib_dev
*dev
= to_mdev(ibsrq
->device
);
375 struct mlx5_ib_srq
*srq
= to_msrq(ibsrq
);
377 struct mlx5_query_srq_mbox_out
*out
;
379 out
= kzalloc(sizeof(*out
), GFP_KERNEL
);
383 ret
= mlx5_core_query_srq(dev
->mdev
, &srq
->msrq
, out
);
387 srq_attr
->srq_limit
= be16_to_cpu(out
->ctx
.lwm
);
388 srq_attr
->max_wr
= srq
->msrq
.max
- 1;
389 srq_attr
->max_sge
= srq
->msrq
.max_gs
;
396 int mlx5_ib_destroy_srq(struct ib_srq
*srq
)
398 struct mlx5_ib_dev
*dev
= to_mdev(srq
->device
);
399 struct mlx5_ib_srq
*msrq
= to_msrq(srq
);
401 mlx5_core_destroy_srq(dev
->mdev
, &msrq
->msrq
);
404 mlx5_ib_db_unmap_user(to_mucontext(srq
->uobject
->context
), &msrq
->db
);
405 ib_umem_release(msrq
->umem
);
407 destroy_srq_kernel(dev
, msrq
);
414 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq
*srq
, int wqe_index
)
416 struct mlx5_wqe_srq_next_seg
*next
;
418 /* always called with interrupts disabled. */
419 spin_lock(&srq
->lock
);
421 next
= get_wqe(srq
, srq
->tail
);
422 next
->next_wqe_index
= cpu_to_be16(wqe_index
);
423 srq
->tail
= wqe_index
;
425 spin_unlock(&srq
->lock
);
428 int mlx5_ib_post_srq_recv(struct ib_srq
*ibsrq
, struct ib_recv_wr
*wr
,
429 struct ib_recv_wr
**bad_wr
)
431 struct mlx5_ib_srq
*srq
= to_msrq(ibsrq
);
432 struct mlx5_wqe_srq_next_seg
*next
;
433 struct mlx5_wqe_data_seg
*scat
;
439 spin_lock_irqsave(&srq
->lock
, flags
);
441 for (nreq
= 0; wr
; nreq
++, wr
= wr
->next
) {
442 if (unlikely(wr
->num_sge
> srq
->msrq
.max_gs
)) {
448 if (unlikely(srq
->head
== srq
->tail
)) {
454 srq
->wrid
[srq
->head
] = wr
->wr_id
;
456 next
= get_wqe(srq
, srq
->head
);
457 srq
->head
= be16_to_cpu(next
->next_wqe_index
);
458 scat
= (struct mlx5_wqe_data_seg
*)(next
+ 1);
460 for (i
= 0; i
< wr
->num_sge
; i
++) {
461 scat
[i
].byte_count
= cpu_to_be32(wr
->sg_list
[i
].length
);
462 scat
[i
].lkey
= cpu_to_be32(wr
->sg_list
[i
].lkey
);
463 scat
[i
].addr
= cpu_to_be64(wr
->sg_list
[i
].addr
);
466 if (i
< srq
->msrq
.max_avail_gather
) {
467 scat
[i
].byte_count
= 0;
468 scat
[i
].lkey
= cpu_to_be32(MLX5_INVALID_LKEY
);
474 srq
->wqe_ctr
+= nreq
;
476 /* Make sure that descriptors are written before
481 *srq
->db
.db
= cpu_to_be32(srq
->wqe_ctr
);
484 spin_unlock_irqrestore(&srq
->lock
, flags
);