1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3 * Copyright (c) 2013-2018, Mellanox Technologies inc. All rights reserved.
4 */
5
6 #include <linux/mlx5/qp.h>
7 #include <linux/slab.h>
8 #include <rdma/ib_umem.h>
9 #include <rdma/ib_user_verbs.h>
10 #include "mlx5_ib.h"
11 #include "srq.h"
12
get_wqe(struct mlx5_ib_srq * srq,int n)13 static void *get_wqe(struct mlx5_ib_srq *srq, int n)
14 {
15 return mlx5_frag_buf_get_wqe(&srq->fbc, n);
16 }
17
mlx5_ib_srq_event(struct mlx5_core_srq * srq,enum mlx5_event type)18 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type)
19 {
20 struct ib_event event;
21 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
22
23 if (ibsrq->event_handler) {
24 event.device = ibsrq->device;
25 event.element.srq = ibsrq;
26 switch (type) {
27 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
28 event.event = IB_EVENT_SRQ_LIMIT_REACHED;
29 break;
30 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
31 event.event = IB_EVENT_SRQ_ERR;
32 break;
33 default:
34 pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
35 type, srq->srqn);
36 return;
37 }
38
39 ibsrq->event_handler(&event, ibsrq->srq_context);
40 }
41 }
42
create_srq_user(struct ib_pd * pd,struct mlx5_ib_srq * srq,struct mlx5_srq_attr * in,struct ib_udata * udata,int buf_size)43 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
44 struct mlx5_srq_attr *in,
45 struct ib_udata *udata, int buf_size)
46 {
47 struct mlx5_ib_dev *dev = to_mdev(pd->device);
48 struct mlx5_ib_create_srq ucmd = {};
49 struct mlx5_ib_ucontext *ucontext = rdma_udata_to_drv_context(
50 udata, struct mlx5_ib_ucontext, ibucontext);
51 size_t ucmdlen;
52 int err;
53 u32 uidx = MLX5_IB_DEFAULT_UIDX;
54
55 ucmdlen = min(udata->inlen, sizeof(ucmd));
56
57 if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
58 mlx5_ib_dbg(dev, "failed copy udata\n");
59 return -EFAULT;
60 }
61
62 if (ucmd.reserved0 || ucmd.reserved1)
63 return -EINVAL;
64
65 if (udata->inlen > sizeof(ucmd) &&
66 !ib_is_udata_cleared(udata, sizeof(ucmd),
67 udata->inlen - sizeof(ucmd)))
68 return -EINVAL;
69
70 if (in->type != IB_SRQT_BASIC) {
71 err = get_srq_user_index(ucontext, &ucmd, udata->inlen, &uidx);
72 if (err)
73 return err;
74 }
75
76 srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
77
78 srq->umem = ib_umem_get(pd->device, ucmd.buf_addr, buf_size, 0);
79 if (IS_ERR(srq->umem)) {
80 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
81 err = PTR_ERR(srq->umem);
82 return err;
83 }
84 in->umem = srq->umem;
85
86 err = mlx5_ib_db_map_user(ucontext, ucmd.db_addr, &srq->db);
87 if (err) {
88 mlx5_ib_dbg(dev, "map doorbell failed\n");
89 goto err_umem;
90 }
91
92 in->uid = (in->type != IB_SRQT_XRC) ? to_mpd(pd)->uid : 0;
93 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
94 in->type != IB_SRQT_BASIC)
95 in->user_index = uidx;
96
97 return 0;
98
99 err_umem:
100 ib_umem_release(srq->umem);
101
102 return err;
103 }
104
create_srq_kernel(struct mlx5_ib_dev * dev,struct mlx5_ib_srq * srq,struct mlx5_srq_attr * in,int buf_size)105 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
106 struct mlx5_srq_attr *in, int buf_size)
107 {
108 int err;
109 int i;
110 struct mlx5_wqe_srq_next_seg *next;
111
112 err = mlx5_db_alloc(dev->mdev, &srq->db);
113 if (err) {
114 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
115 return err;
116 }
117
118 if (mlx5_frag_buf_alloc_node(dev->mdev, buf_size, &srq->buf,
119 dev->mdev->priv.numa_node)) {
120 mlx5_ib_dbg(dev, "buf alloc failed\n");
121 err = -ENOMEM;
122 goto err_db;
123 }
124
125 mlx5_init_fbc(srq->buf.frags, srq->msrq.wqe_shift, ilog2(srq->msrq.max),
126 &srq->fbc);
127
128 srq->head = 0;
129 srq->tail = srq->msrq.max - 1;
130 srq->wqe_ctr = 0;
131
132 for (i = 0; i < srq->msrq.max; i++) {
133 next = get_wqe(srq, i);
134 next->next_wqe_index =
135 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
136 }
137
138 mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
139 in->pas = kvcalloc(srq->buf.npages, sizeof(*in->pas), GFP_KERNEL);
140 if (!in->pas) {
141 err = -ENOMEM;
142 goto err_buf;
143 }
144 mlx5_fill_page_frag_array(&srq->buf, in->pas);
145
146 srq->wrid = kvmalloc_array(srq->msrq.max, sizeof(u64), GFP_KERNEL);
147 if (!srq->wrid) {
148 err = -ENOMEM;
149 goto err_in;
150 }
151 srq->wq_sig = 0;
152
153 in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
154 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
155 in->type != IB_SRQT_BASIC)
156 in->user_index = MLX5_IB_DEFAULT_UIDX;
157
158 return 0;
159
160 err_in:
161 kvfree(in->pas);
162
163 err_buf:
164 mlx5_frag_buf_free(dev->mdev, &srq->buf);
165
166 err_db:
167 mlx5_db_free(dev->mdev, &srq->db);
168 return err;
169 }
170
destroy_srq_user(struct ib_pd * pd,struct mlx5_ib_srq * srq,struct ib_udata * udata)171 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
172 struct ib_udata *udata)
173 {
174 mlx5_ib_db_unmap_user(
175 rdma_udata_to_drv_context(
176 udata,
177 struct mlx5_ib_ucontext,
178 ibucontext),
179 &srq->db);
180 ib_umem_release(srq->umem);
181 }
182
183
destroy_srq_kernel(struct mlx5_ib_dev * dev,struct mlx5_ib_srq * srq)184 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
185 {
186 kvfree(srq->wrid);
187 mlx5_frag_buf_free(dev->mdev, &srq->buf);
188 mlx5_db_free(dev->mdev, &srq->db);
189 }
190
mlx5_ib_create_srq(struct ib_srq * ib_srq,struct ib_srq_init_attr * init_attr,struct ib_udata * udata)191 int mlx5_ib_create_srq(struct ib_srq *ib_srq,
192 struct ib_srq_init_attr *init_attr,
193 struct ib_udata *udata)
194 {
195 struct mlx5_ib_dev *dev = to_mdev(ib_srq->device);
196 struct mlx5_ib_srq *srq = to_msrq(ib_srq);
197 size_t desc_size;
198 size_t buf_size;
199 int err;
200 struct mlx5_srq_attr in = {};
201 __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
202
203 if (init_attr->srq_type != IB_SRQT_BASIC &&
204 init_attr->srq_type != IB_SRQT_XRC &&
205 init_attr->srq_type != IB_SRQT_TM)
206 return -EOPNOTSUPP;
207
208 /* Sanity check SRQ size before proceeding */
209 if (init_attr->attr.max_wr >= max_srq_wqes) {
210 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
211 init_attr->attr.max_wr,
212 max_srq_wqes);
213 return -EINVAL;
214 }
215
216 mutex_init(&srq->mutex);
217 spin_lock_init(&srq->lock);
218 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
219 srq->msrq.max_gs = init_attr->attr.max_sge;
220
221 desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
222 srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
223 if (desc_size == 0 || srq->msrq.max_gs > desc_size)
224 return -EINVAL;
225
226 desc_size = roundup_pow_of_two(desc_size);
227 desc_size = max_t(size_t, 32, desc_size);
228 if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg))
229 return -EINVAL;
230
231 srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
232 sizeof(struct mlx5_wqe_data_seg);
233 srq->msrq.wqe_shift = ilog2(desc_size);
234 buf_size = srq->msrq.max * desc_size;
235 if (buf_size < desc_size)
236 return -EINVAL;
237
238 in.type = init_attr->srq_type;
239
240 if (udata)
241 err = create_srq_user(ib_srq->pd, srq, &in, udata, buf_size);
242 else
243 err = create_srq_kernel(dev, srq, &in, buf_size);
244
245 if (err) {
246 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
247 udata ? "user" : "kernel", err);
248 return err;
249 }
250
251 in.log_size = ilog2(srq->msrq.max);
252 in.wqe_shift = srq->msrq.wqe_shift - 4;
253 if (srq->wq_sig)
254 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
255
256 if (init_attr->srq_type == IB_SRQT_XRC && init_attr->ext.xrc.xrcd)
257 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
258 else
259 in.xrcd = dev->devr.xrcdn0;
260
261 if (init_attr->srq_type == IB_SRQT_TM) {
262 in.tm_log_list_size =
263 ilog2(init_attr->ext.tag_matching.max_num_tags) + 1;
264 if (in.tm_log_list_size >
265 MLX5_CAP_GEN(dev->mdev, log_tag_matching_list_sz)) {
266 mlx5_ib_dbg(dev, "TM SRQ max_num_tags exceeding limit\n");
267 err = -EINVAL;
268 goto err_usr_kern_srq;
269 }
270 in.flags |= MLX5_SRQ_FLAG_RNDV;
271 }
272
273 if (ib_srq_has_cq(init_attr->srq_type))
274 in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn;
275 else
276 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
277
278 in.pd = to_mpd(ib_srq->pd)->pdn;
279 in.db_record = srq->db.dma;
280 err = mlx5_cmd_create_srq(dev, &srq->msrq, &in);
281 kvfree(in.pas);
282 if (err) {
283 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
284 goto err_usr_kern_srq;
285 }
286
287 mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
288
289 srq->msrq.event = mlx5_ib_srq_event;
290 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
291
292 if (udata) {
293 struct mlx5_ib_create_srq_resp resp = {
294 .srqn = srq->msrq.srqn,
295 };
296
297 if (ib_copy_to_udata(udata, &resp, min(udata->outlen,
298 sizeof(resp)))) {
299 mlx5_ib_dbg(dev, "copy to user failed\n");
300 err = -EFAULT;
301 goto err_core;
302 }
303 }
304
305 init_attr->attr.max_wr = srq->msrq.max - 1;
306
307 return 0;
308
309 err_core:
310 mlx5_cmd_destroy_srq(dev, &srq->msrq);
311
312 err_usr_kern_srq:
313 if (udata)
314 destroy_srq_user(ib_srq->pd, srq, udata);
315 else
316 destroy_srq_kernel(dev, srq);
317
318 return err;
319 }
320
mlx5_ib_modify_srq(struct ib_srq * ibsrq,struct ib_srq_attr * attr,enum ib_srq_attr_mask attr_mask,struct ib_udata * udata)321 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
322 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
323 {
324 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
325 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
326 int ret;
327
328 /* We don't support resizing SRQs yet */
329 if (attr_mask & IB_SRQ_MAX_WR)
330 return -EINVAL;
331
332 if (attr_mask & IB_SRQ_LIMIT) {
333 if (attr->srq_limit >= srq->msrq.max)
334 return -EINVAL;
335
336 mutex_lock(&srq->mutex);
337 ret = mlx5_cmd_arm_srq(dev, &srq->msrq, attr->srq_limit, 1);
338 mutex_unlock(&srq->mutex);
339
340 if (ret)
341 return ret;
342 }
343
344 return 0;
345 }
346
mlx5_ib_query_srq(struct ib_srq * ibsrq,struct ib_srq_attr * srq_attr)347 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
348 {
349 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
350 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
351 int ret;
352 struct mlx5_srq_attr *out;
353
354 out = kzalloc(sizeof(*out), GFP_KERNEL);
355 if (!out)
356 return -ENOMEM;
357
358 ret = mlx5_cmd_query_srq(dev, &srq->msrq, out);
359 if (ret)
360 goto out_box;
361
362 srq_attr->srq_limit = out->lwm;
363 srq_attr->max_wr = srq->msrq.max - 1;
364 srq_attr->max_sge = srq->msrq.max_gs;
365
366 out_box:
367 kfree(out);
368 return ret;
369 }
370
mlx5_ib_destroy_srq(struct ib_srq * srq,struct ib_udata * udata)371 int mlx5_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
372 {
373 struct mlx5_ib_dev *dev = to_mdev(srq->device);
374 struct mlx5_ib_srq *msrq = to_msrq(srq);
375 int ret;
376
377 ret = mlx5_cmd_destroy_srq(dev, &msrq->msrq);
378 if (ret)
379 return ret;
380
381 if (udata)
382 destroy_srq_user(srq->pd, msrq, udata);
383 else
384 destroy_srq_kernel(dev, msrq);
385 return 0;
386 }
387
mlx5_ib_free_srq_wqe(struct mlx5_ib_srq * srq,int wqe_index)388 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
389 {
390 struct mlx5_wqe_srq_next_seg *next;
391
392 /* always called with interrupts disabled. */
393 spin_lock(&srq->lock);
394
395 next = get_wqe(srq, srq->tail);
396 next->next_wqe_index = cpu_to_be16(wqe_index);
397 srq->tail = wqe_index;
398
399 spin_unlock(&srq->lock);
400 }
401
mlx5_ib_post_srq_recv(struct ib_srq * ibsrq,const struct ib_recv_wr * wr,const struct ib_recv_wr ** bad_wr)402 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
403 const struct ib_recv_wr **bad_wr)
404 {
405 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
406 struct mlx5_wqe_srq_next_seg *next;
407 struct mlx5_wqe_data_seg *scat;
408 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
409 struct mlx5_core_dev *mdev = dev->mdev;
410 unsigned long flags;
411 int err = 0;
412 int nreq;
413 int i;
414
415 spin_lock_irqsave(&srq->lock, flags);
416
417 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
418 err = -EIO;
419 *bad_wr = wr;
420 goto out;
421 }
422
423 for (nreq = 0; wr; nreq++, wr = wr->next) {
424 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
425 err = -EINVAL;
426 *bad_wr = wr;
427 break;
428 }
429
430 if (unlikely(srq->head == srq->tail)) {
431 err = -ENOMEM;
432 *bad_wr = wr;
433 break;
434 }
435
436 srq->wrid[srq->head] = wr->wr_id;
437
438 next = get_wqe(srq, srq->head);
439 srq->head = be16_to_cpu(next->next_wqe_index);
440 scat = (struct mlx5_wqe_data_seg *)(next + 1);
441
442 for (i = 0; i < wr->num_sge; i++) {
443 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
444 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
445 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
446 }
447
448 if (i < srq->msrq.max_avail_gather) {
449 scat[i].byte_count = 0;
450 scat[i].lkey = dev->mkeys.terminate_scatter_list_mkey;
451 scat[i].addr = 0;
452 }
453 }
454
455 if (likely(nreq)) {
456 srq->wqe_ctr += nreq;
457
458 /* Make sure that descriptors are written before
459 * doorbell record.
460 */
461 wmb();
462
463 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
464 }
465 out:
466 spin_unlock_irqrestore(&srq->lock, flags);
467
468 return err;
469 }
470