1 /*-
2 * Copyright (c) 2013-2020, Mellanox Technologies, Ltd. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include "opt_rss.h"
27 #include "opt_ratelimit.h"
28
29 #include <linux/module.h>
30 #include <dev/mlx5/qp.h>
31 #include <dev/mlx5/srq.h>
32 #include <linux/slab.h>
33 #include <rdma/ib_umem.h>
34 #include <rdma/ib_user_verbs.h>
35 #include <rdma/uverbs_ioctl.h>
36
37 #include <dev/mlx5/mlx5_ib/mlx5_ib.h>
38
get_wqe(struct mlx5_ib_srq * srq,int n)39 static void *get_wqe(struct mlx5_ib_srq *srq, int n)
40 {
41 return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
42 }
43
mlx5_ib_srq_event(struct mlx5_core_srq * srq,int type)44 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, int type)
45 {
46 struct ib_event event;
47 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
48
49 if (ibsrq->event_handler) {
50 event.device = ibsrq->device;
51 event.element.srq = ibsrq;
52 switch (type) {
53 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
54 event.event = IB_EVENT_SRQ_LIMIT_REACHED;
55 break;
56 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
57 event.event = IB_EVENT_SRQ_ERR;
58 break;
59 default:
60 pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
61 type, srq->srqn);
62 return;
63 }
64
65 ibsrq->event_handler(&event, ibsrq->srq_context);
66 }
67 }
68
create_srq_user(struct ib_pd * pd,struct mlx5_ib_srq * srq,struct mlx5_srq_attr * in,struct ib_udata * udata,int buf_size)69 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
70 struct mlx5_srq_attr *in,
71 struct ib_udata *udata, int buf_size)
72 {
73 struct mlx5_ib_dev *dev = to_mdev(pd->device);
74 struct mlx5_ib_create_srq ucmd = {};
75 struct mlx5_ib_ucontext *ucontext = rdma_udata_to_drv_context(
76 udata, struct mlx5_ib_ucontext, ibucontext);
77 size_t ucmdlen;
78 int err;
79 int npages;
80 int page_shift;
81 int ncont;
82 u32 offset;
83 u32 uidx = MLX5_IB_DEFAULT_UIDX;
84
85 ucmdlen = min(udata->inlen, sizeof(ucmd));
86
87 if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
88 mlx5_ib_dbg(dev, "failed copy udata\n");
89 return -EFAULT;
90 }
91
92 if (ucmd.reserved0 || ucmd.reserved1)
93 return -EINVAL;
94
95 if (udata->inlen > sizeof(ucmd) &&
96 !ib_is_udata_cleared(udata, sizeof(ucmd),
97 udata->inlen - sizeof(ucmd)))
98 return -EINVAL;
99
100 if (in->type != IB_SRQT_BASIC) {
101 err = get_srq_user_index(ucontext, &ucmd, udata->inlen, &uidx);
102 if (err)
103 return err;
104 }
105
106 srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
107
108 srq->umem = ib_umem_get(&ucontext->ibucontext, ucmd.buf_addr, buf_size, 0, 0);
109 if (IS_ERR(srq->umem)) {
110 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
111 err = PTR_ERR(srq->umem);
112 return err;
113 }
114
115 mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, 0, &npages,
116 &page_shift, &ncont, NULL);
117 err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
118 &offset);
119 if (err) {
120 mlx5_ib_warn(dev, "bad offset\n");
121 goto err_umem;
122 }
123
124 in->pas = mlx5_vzalloc(sizeof(*in->pas) * ncont);
125 if (!in->pas) {
126 err = -ENOMEM;
127 goto err_umem;
128 }
129
130 mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0);
131
132 err = mlx5_ib_db_map_user(ucontext, ucmd.db_addr, &srq->db);
133 if (err) {
134 mlx5_ib_dbg(dev, "map doorbell failed\n");
135 goto err_in;
136 }
137
138 in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
139 in->page_offset = offset;
140 in->uid = (in->type != IB_SRQT_XRC) ? to_mpd(pd)->uid : 0;
141 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
142 in->type != IB_SRQT_BASIC)
143 in->user_index = uidx;
144
145 return 0;
146
147 err_in:
148 kvfree(in->pas);
149
150 err_umem:
151 ib_umem_release(srq->umem);
152
153 return err;
154 }
155
create_srq_kernel(struct mlx5_ib_dev * dev,struct mlx5_ib_srq * srq,struct mlx5_srq_attr * in,int buf_size)156 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
157 struct mlx5_srq_attr *in, int buf_size)
158 {
159 int err;
160 int i;
161 struct mlx5_wqe_srq_next_seg *next;
162
163 err = mlx5_db_alloc(dev->mdev, &srq->db);
164 if (err) {
165 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
166 return err;
167 }
168
169 if (mlx5_buf_alloc(dev->mdev, buf_size, 2 * PAGE_SIZE, &srq->buf)) {
170 mlx5_ib_dbg(dev, "buf alloc failed\n");
171 err = -ENOMEM;
172 goto err_db;
173 }
174
175 srq->head = 0;
176 srq->tail = srq->msrq.max - 1;
177 srq->wqe_ctr = 0;
178
179 for (i = 0; i < srq->msrq.max; i++) {
180 next = get_wqe(srq, i);
181 next->next_wqe_index =
182 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
183 }
184
185 mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
186 in->pas = mlx5_vzalloc(sizeof(*in->pas) * srq->buf.npages);
187 if (!in->pas) {
188 err = -ENOMEM;
189 goto err_buf;
190 }
191 mlx5_fill_page_array(&srq->buf, in->pas);
192
193 srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
194 if (!srq->wrid) {
195 err = -ENOMEM;
196 goto err_in;
197 }
198 srq->wq_sig = 0;
199
200 in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
201 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
202 in->type != IB_SRQT_BASIC)
203 in->user_index = MLX5_IB_DEFAULT_UIDX;
204
205 return 0;
206
207 err_in:
208 kvfree(in->pas);
209
210 err_buf:
211 mlx5_buf_free(dev->mdev, &srq->buf);
212
213 err_db:
214 mlx5_db_free(dev->mdev, &srq->db);
215 return err;
216 }
217
destroy_srq_user(struct ib_pd * pd,struct mlx5_ib_srq * srq,struct ib_udata * udata)218 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
219 struct ib_udata *udata)
220 {
221 mlx5_ib_db_unmap_user(
222 rdma_udata_to_drv_context(
223 udata,
224 struct mlx5_ib_ucontext,
225 ibucontext),
226 &srq->db);
227 ib_umem_release(srq->umem);
228 }
229
230
destroy_srq_kernel(struct mlx5_ib_dev * dev,struct mlx5_ib_srq * srq)231 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
232 {
233 kfree(srq->wrid);
234 mlx5_buf_free(dev->mdev, &srq->buf);
235 mlx5_db_free(dev->mdev, &srq->db);
236 }
237
mlx5_ib_create_srq(struct ib_srq * ib_srq,struct ib_srq_init_attr * init_attr,struct ib_udata * udata)238 int mlx5_ib_create_srq(struct ib_srq *ib_srq,
239 struct ib_srq_init_attr *init_attr,
240 struct ib_udata *udata)
241 {
242 struct mlx5_ib_dev *dev = to_mdev(ib_srq->device);
243 struct mlx5_ib_srq *srq = to_msrq(ib_srq);
244 size_t desc_size;
245 size_t buf_size;
246 int err;
247 struct mlx5_srq_attr in = {};
248 __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
249
250 /* Sanity check SRQ size before proceeding */
251 if (init_attr->attr.max_wr >= max_srq_wqes) {
252 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
253 init_attr->attr.max_wr,
254 max_srq_wqes);
255 return -EINVAL;
256 }
257
258 mutex_init(&srq->mutex);
259 spin_lock_init(&srq->lock);
260 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
261 srq->msrq.max_gs = init_attr->attr.max_sge;
262
263 desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
264 srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
265 if (desc_size == 0 || srq->msrq.max_gs > desc_size)
266 return -EINVAL;
267
268 desc_size = roundup_pow_of_two(desc_size);
269 desc_size = max_t(size_t, 32, desc_size);
270 if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg))
271 return -EINVAL;
272
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 if (buf_size < desc_size)
278 return -EINVAL;
279
280 in.type = init_attr->srq_type;
281
282 if (udata)
283 err = create_srq_user(ib_srq->pd, srq, &in, udata, buf_size);
284 else
285 err = create_srq_kernel(dev, srq, &in, buf_size);
286
287 if (err) {
288 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
289 udata ? "user" : "kernel", err);
290 return err;
291 }
292
293 in.log_size = ilog2(srq->msrq.max);
294 in.wqe_shift = srq->msrq.wqe_shift - 4;
295 if (srq->wq_sig)
296 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
297
298 if (init_attr->srq_type == IB_SRQT_XRC)
299 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
300 else
301 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
302
303 if (ib_srq_has_cq(init_attr->srq_type))
304 in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn;
305 else
306 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
307
308 in.pd = to_mpd(ib_srq->pd)->pdn;
309 in.db_record = srq->db.dma;
310 err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in);
311 kvfree(in.pas);
312 if (err) {
313 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
314 goto err_usr_kern_srq;
315 }
316
317 mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
318
319 srq->msrq.event = mlx5_ib_srq_event;
320 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
321
322 if (udata)
323 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
324 mlx5_ib_dbg(dev, "copy to user failed\n");
325 err = -EFAULT;
326 goto err_core;
327 }
328
329 init_attr->attr.max_wr = srq->msrq.max - 1;
330
331 return 0;
332
333 err_core:
334 mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
335
336 err_usr_kern_srq:
337 if (udata)
338 destroy_srq_user(ib_srq->pd, srq, udata);
339 else
340 destroy_srq_kernel(dev, srq);
341
342 return err;
343 }
344
mlx5_ib_modify_srq(struct ib_srq * ibsrq,struct ib_srq_attr * attr,enum ib_srq_attr_mask attr_mask,struct ib_udata * udata)345 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
346 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
347 {
348 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
349 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
350 int ret;
351
352 /* We don't support resizing SRQs yet */
353 if (attr_mask & IB_SRQ_MAX_WR)
354 return -EINVAL;
355
356 if (attr_mask & IB_SRQ_LIMIT) {
357 if (attr->srq_limit >= srq->msrq.max)
358 return -EINVAL;
359
360 mutex_lock(&srq->mutex);
361 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
362 mutex_unlock(&srq->mutex);
363
364 if (ret)
365 return ret;
366 }
367
368 return 0;
369 }
370
mlx5_ib_query_srq(struct ib_srq * ibsrq,struct ib_srq_attr * srq_attr)371 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
372 {
373 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
374 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
375 int ret;
376 struct mlx5_srq_attr *out;
377
378 out = kzalloc(sizeof(*out), GFP_KERNEL);
379 if (!out)
380 return -ENOMEM;
381
382 ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
383 if (ret)
384 goto out_box;
385
386 srq_attr->srq_limit = out->lwm;
387 srq_attr->max_wr = srq->msrq.max - 1;
388 srq_attr->max_sge = srq->msrq.max_gs;
389
390 out_box:
391 kfree(out);
392 return ret;
393 }
394
mlx5_ib_destroy_srq(struct ib_srq * srq,struct ib_udata * udata)395 void mlx5_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
396 {
397 struct mlx5_ib_dev *dev = to_mdev(srq->device);
398 struct mlx5_ib_srq *msrq = to_msrq(srq);
399
400 mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
401
402 if (srq->uobject) {
403 mlx5_ib_db_unmap_user(
404 rdma_udata_to_drv_context(
405 udata,
406 struct mlx5_ib_ucontext,
407 ibucontext),
408 &msrq->db);
409 ib_umem_release(msrq->umem);
410 } else {
411 destroy_srq_kernel(dev, msrq);
412 }
413 }
414
mlx5_ib_free_srq_wqe(struct mlx5_ib_srq * srq,int wqe_index)415 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
416 {
417 struct mlx5_wqe_srq_next_seg *next;
418
419 /* always called with interrupts disabled. */
420 spin_lock(&srq->lock);
421
422 next = get_wqe(srq, srq->tail);
423 next->next_wqe_index = cpu_to_be16(wqe_index);
424 srq->tail = wqe_index;
425
426 spin_unlock(&srq->lock);
427 }
428
mlx5_ib_post_srq_recv(struct ib_srq * ibsrq,const struct ib_recv_wr * wr,const struct ib_recv_wr ** bad_wr)429 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
430 const struct ib_recv_wr **bad_wr)
431 {
432 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
433 struct mlx5_wqe_srq_next_seg *next;
434 struct mlx5_wqe_data_seg *scat;
435 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
436 struct mlx5_core_dev *mdev = dev->mdev;
437 unsigned long flags;
438 int err = 0;
439 int nreq;
440 int i;
441
442 spin_lock_irqsave(&srq->lock, flags);
443
444 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
445 err = -EIO;
446 *bad_wr = wr;
447 goto out;
448 }
449
450 for (nreq = 0; wr; nreq++, wr = wr->next) {
451 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
452 err = -EINVAL;
453 *bad_wr = wr;
454 break;
455 }
456
457 if (unlikely(srq->head == srq->tail)) {
458 err = -ENOMEM;
459 *bad_wr = wr;
460 break;
461 }
462
463 srq->wrid[srq->head] = wr->wr_id;
464
465 next = get_wqe(srq, srq->head);
466 srq->head = be16_to_cpu(next->next_wqe_index);
467 scat = (struct mlx5_wqe_data_seg *)(next + 1);
468
469 for (i = 0; i < wr->num_sge; i++) {
470 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
471 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
472 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
473 }
474
475 if (i < srq->msrq.max_avail_gather) {
476 scat[i].byte_count = 0;
477 scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY);
478 scat[i].addr = 0;
479 }
480 }
481
482 if (likely(nreq)) {
483 srq->wqe_ctr += nreq;
484
485 /* Make sure that descriptors are written before
486 * doorbell record.
487 */
488 wmb();
489
490 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
491 }
492 out:
493 spin_unlock_irqrestore(&srq->lock, flags);
494
495 return err;
496 }
497