This source file includes following definitions.
- get_wqe
- mlx5_ib_srq_event
- create_srq_user
- create_srq_kernel
- destroy_srq_user
- destroy_srq_kernel
- mlx5_ib_create_srq
- mlx5_ib_modify_srq
- mlx5_ib_query_srq
- mlx5_ib_destroy_srq
- mlx5_ib_free_srq_wqe
- mlx5_ib_post_srq_recv
1
2
3
4
5
6 #include <linux/module.h>
7 #include <linux/mlx5/qp.h>
8 #include <linux/slab.h>
9 #include <rdma/ib_umem.h>
10 #include <rdma/ib_user_verbs.h>
11 #include "mlx5_ib.h"
12 #include "srq.h"
13
14 static void *get_wqe(struct mlx5_ib_srq *srq, int n)
15 {
16 return mlx5_frag_buf_get_wqe(&srq->fbc, n);
17 }
18
19 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type)
20 {
21 struct ib_event event;
22 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
23
24 if (ibsrq->event_handler) {
25 event.device = ibsrq->device;
26 event.element.srq = ibsrq;
27 switch (type) {
28 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
29 event.event = IB_EVENT_SRQ_LIMIT_REACHED;
30 break;
31 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
32 event.event = IB_EVENT_SRQ_ERR;
33 break;
34 default:
35 pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
36 type, srq->srqn);
37 return;
38 }
39
40 ibsrq->event_handler(&event, ibsrq->srq_context);
41 }
42 }
43
44 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
45 struct mlx5_srq_attr *in,
46 struct ib_udata *udata, int buf_size)
47 {
48 struct mlx5_ib_dev *dev = to_mdev(pd->device);
49 struct mlx5_ib_create_srq ucmd = {};
50 struct mlx5_ib_ucontext *ucontext = rdma_udata_to_drv_context(
51 udata, struct mlx5_ib_ucontext, ibucontext);
52 size_t ucmdlen;
53 int err;
54 int npages;
55 int page_shift;
56 int ncont;
57 u32 offset;
58 u32 uidx = MLX5_IB_DEFAULT_UIDX;
59
60 ucmdlen = min(udata->inlen, sizeof(ucmd));
61
62 if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
63 mlx5_ib_dbg(dev, "failed copy udata\n");
64 return -EFAULT;
65 }
66
67 if (ucmd.reserved0 || ucmd.reserved1)
68 return -EINVAL;
69
70 if (udata->inlen > sizeof(ucmd) &&
71 !ib_is_udata_cleared(udata, sizeof(ucmd),
72 udata->inlen - sizeof(ucmd)))
73 return -EINVAL;
74
75 if (in->type != IB_SRQT_BASIC) {
76 err = get_srq_user_index(ucontext, &ucmd, udata->inlen, &uidx);
77 if (err)
78 return err;
79 }
80
81 srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
82
83 srq->umem = ib_umem_get(udata, ucmd.buf_addr, buf_size, 0, 0);
84 if (IS_ERR(srq->umem)) {
85 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
86 err = PTR_ERR(srq->umem);
87 return err;
88 }
89
90 mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, 0, &npages,
91 &page_shift, &ncont, NULL);
92 err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
93 &offset);
94 if (err) {
95 mlx5_ib_warn(dev, "bad offset\n");
96 goto err_umem;
97 }
98
99 in->pas = kvcalloc(ncont, sizeof(*in->pas), GFP_KERNEL);
100 if (!in->pas) {
101 err = -ENOMEM;
102 goto err_umem;
103 }
104
105 mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0);
106
107 err = mlx5_ib_db_map_user(ucontext, udata, ucmd.db_addr, &srq->db);
108 if (err) {
109 mlx5_ib_dbg(dev, "map doorbell failed\n");
110 goto err_in;
111 }
112
113 in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
114 in->page_offset = offset;
115 in->uid = (in->type != IB_SRQT_XRC) ? to_mpd(pd)->uid : 0;
116 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
117 in->type != IB_SRQT_BASIC)
118 in->user_index = uidx;
119
120 return 0;
121
122 err_in:
123 kvfree(in->pas);
124
125 err_umem:
126 ib_umem_release(srq->umem);
127
128 return err;
129 }
130
131 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
132 struct mlx5_srq_attr *in, int buf_size)
133 {
134 int err;
135 int i;
136 struct mlx5_wqe_srq_next_seg *next;
137
138 err = mlx5_db_alloc(dev->mdev, &srq->db);
139 if (err) {
140 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
141 return err;
142 }
143
144 if (mlx5_frag_buf_alloc_node(dev->mdev, buf_size, &srq->buf,
145 dev->mdev->priv.numa_node)) {
146 mlx5_ib_dbg(dev, "buf alloc failed\n");
147 err = -ENOMEM;
148 goto err_db;
149 }
150
151 mlx5_init_fbc(srq->buf.frags, srq->msrq.wqe_shift, ilog2(srq->msrq.max),
152 &srq->fbc);
153
154 srq->head = 0;
155 srq->tail = srq->msrq.max - 1;
156 srq->wqe_ctr = 0;
157
158 for (i = 0; i < srq->msrq.max; i++) {
159 next = get_wqe(srq, i);
160 next->next_wqe_index =
161 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
162 }
163
164 mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
165 in->pas = kvcalloc(srq->buf.npages, sizeof(*in->pas), GFP_KERNEL);
166 if (!in->pas) {
167 err = -ENOMEM;
168 goto err_buf;
169 }
170 mlx5_fill_page_frag_array(&srq->buf, in->pas);
171
172 srq->wrid = kvmalloc_array(srq->msrq.max, sizeof(u64), GFP_KERNEL);
173 if (!srq->wrid) {
174 err = -ENOMEM;
175 goto err_in;
176 }
177 srq->wq_sig = 0;
178
179 in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
180 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
181 in->type != IB_SRQT_BASIC)
182 in->user_index = MLX5_IB_DEFAULT_UIDX;
183
184 return 0;
185
186 err_in:
187 kvfree(in->pas);
188
189 err_buf:
190 mlx5_frag_buf_free(dev->mdev, &srq->buf);
191
192 err_db:
193 mlx5_db_free(dev->mdev, &srq->db);
194 return err;
195 }
196
197 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
198 struct ib_udata *udata)
199 {
200 mlx5_ib_db_unmap_user(
201 rdma_udata_to_drv_context(
202 udata,
203 struct mlx5_ib_ucontext,
204 ibucontext),
205 &srq->db);
206 ib_umem_release(srq->umem);
207 }
208
209
210 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
211 {
212 kvfree(srq->wrid);
213 mlx5_frag_buf_free(dev->mdev, &srq->buf);
214 mlx5_db_free(dev->mdev, &srq->db);
215 }
216
217 int mlx5_ib_create_srq(struct ib_srq *ib_srq,
218 struct ib_srq_init_attr *init_attr,
219 struct ib_udata *udata)
220 {
221 struct mlx5_ib_dev *dev = to_mdev(ib_srq->device);
222 struct mlx5_ib_srq *srq = to_msrq(ib_srq);
223 size_t desc_size;
224 size_t buf_size;
225 int err;
226 struct mlx5_srq_attr in = {};
227 __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
228
229
230 if (init_attr->attr.max_wr >= max_srq_wqes) {
231 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
232 init_attr->attr.max_wr,
233 max_srq_wqes);
234 return -EINVAL;
235 }
236
237 mutex_init(&srq->mutex);
238 spin_lock_init(&srq->lock);
239 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
240 srq->msrq.max_gs = init_attr->attr.max_sge;
241
242 desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
243 srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
244 if (desc_size == 0 || srq->msrq.max_gs > desc_size)
245 return -EINVAL;
246
247 desc_size = roundup_pow_of_two(desc_size);
248 desc_size = max_t(size_t, 32, desc_size);
249 if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg))
250 return -EINVAL;
251
252 srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
253 sizeof(struct mlx5_wqe_data_seg);
254 srq->msrq.wqe_shift = ilog2(desc_size);
255 buf_size = srq->msrq.max * desc_size;
256 if (buf_size < desc_size)
257 return -EINVAL;
258
259 in.type = init_attr->srq_type;
260
261 if (udata)
262 err = create_srq_user(ib_srq->pd, srq, &in, udata, buf_size);
263 else
264 err = create_srq_kernel(dev, srq, &in, buf_size);
265
266 if (err) {
267 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
268 udata ? "user" : "kernel", err);
269 return err;
270 }
271
272 in.log_size = ilog2(srq->msrq.max);
273 in.wqe_shift = srq->msrq.wqe_shift - 4;
274 if (srq->wq_sig)
275 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
276
277 if (init_attr->srq_type == IB_SRQT_XRC)
278 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
279 else
280 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
281
282 if (init_attr->srq_type == IB_SRQT_TM) {
283 in.tm_log_list_size =
284 ilog2(init_attr->ext.tag_matching.max_num_tags) + 1;
285 if (in.tm_log_list_size >
286 MLX5_CAP_GEN(dev->mdev, log_tag_matching_list_sz)) {
287 mlx5_ib_dbg(dev, "TM SRQ max_num_tags exceeding limit\n");
288 err = -EINVAL;
289 goto err_usr_kern_srq;
290 }
291 in.flags |= MLX5_SRQ_FLAG_RNDV;
292 }
293
294 if (ib_srq_has_cq(init_attr->srq_type))
295 in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn;
296 else
297 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
298
299 in.pd = to_mpd(ib_srq->pd)->pdn;
300 in.db_record = srq->db.dma;
301 err = mlx5_cmd_create_srq(dev, &srq->msrq, &in);
302 kvfree(in.pas);
303 if (err) {
304 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
305 goto err_usr_kern_srq;
306 }
307
308 mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
309
310 srq->msrq.event = mlx5_ib_srq_event;
311 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
312
313 if (udata)
314 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
315 mlx5_ib_dbg(dev, "copy to user failed\n");
316 err = -EFAULT;
317 goto err_core;
318 }
319
320 init_attr->attr.max_wr = srq->msrq.max - 1;
321
322 return 0;
323
324 err_core:
325 mlx5_cmd_destroy_srq(dev, &srq->msrq);
326
327 err_usr_kern_srq:
328 if (udata)
329 destroy_srq_user(ib_srq->pd, srq, udata);
330 else
331 destroy_srq_kernel(dev, srq);
332
333 return err;
334 }
335
336 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
337 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
338 {
339 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
340 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
341 int ret;
342
343
344 if (attr_mask & IB_SRQ_MAX_WR)
345 return -EINVAL;
346
347 if (attr_mask & IB_SRQ_LIMIT) {
348 if (attr->srq_limit >= srq->msrq.max)
349 return -EINVAL;
350
351 mutex_lock(&srq->mutex);
352 ret = mlx5_cmd_arm_srq(dev, &srq->msrq, attr->srq_limit, 1);
353 mutex_unlock(&srq->mutex);
354
355 if (ret)
356 return ret;
357 }
358
359 return 0;
360 }
361
362 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
363 {
364 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
365 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
366 int ret;
367 struct mlx5_srq_attr *out;
368
369 out = kzalloc(sizeof(*out), GFP_KERNEL);
370 if (!out)
371 return -ENOMEM;
372
373 ret = mlx5_cmd_query_srq(dev, &srq->msrq, out);
374 if (ret)
375 goto out_box;
376
377 srq_attr->srq_limit = out->lwm;
378 srq_attr->max_wr = srq->msrq.max - 1;
379 srq_attr->max_sge = srq->msrq.max_gs;
380
381 out_box:
382 kfree(out);
383 return ret;
384 }
385
386 void mlx5_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
387 {
388 struct mlx5_ib_dev *dev = to_mdev(srq->device);
389 struct mlx5_ib_srq *msrq = to_msrq(srq);
390
391 mlx5_cmd_destroy_srq(dev, &msrq->msrq);
392
393 if (srq->uobject) {
394 mlx5_ib_db_unmap_user(
395 rdma_udata_to_drv_context(
396 udata,
397 struct mlx5_ib_ucontext,
398 ibucontext),
399 &msrq->db);
400 ib_umem_release(msrq->umem);
401 } else {
402 destroy_srq_kernel(dev, msrq);
403 }
404 }
405
406 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
407 {
408 struct mlx5_wqe_srq_next_seg *next;
409
410
411 spin_lock(&srq->lock);
412
413 next = get_wqe(srq, srq->tail);
414 next->next_wqe_index = cpu_to_be16(wqe_index);
415 srq->tail = wqe_index;
416
417 spin_unlock(&srq->lock);
418 }
419
420 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
421 const struct ib_recv_wr **bad_wr)
422 {
423 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
424 struct mlx5_wqe_srq_next_seg *next;
425 struct mlx5_wqe_data_seg *scat;
426 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
427 struct mlx5_core_dev *mdev = dev->mdev;
428 unsigned long flags;
429 int err = 0;
430 int nreq;
431 int i;
432
433 spin_lock_irqsave(&srq->lock, flags);
434
435 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
436 err = -EIO;
437 *bad_wr = wr;
438 goto out;
439 }
440
441 for (nreq = 0; wr; nreq++, wr = wr->next) {
442 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
443 err = -EINVAL;
444 *bad_wr = wr;
445 break;
446 }
447
448 if (unlikely(srq->head == srq->tail)) {
449 err = -ENOMEM;
450 *bad_wr = wr;
451 break;
452 }
453
454 srq->wrid[srq->head] = wr->wr_id;
455
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);
459
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);
464 }
465
466 if (i < srq->msrq.max_avail_gather) {
467 scat[i].byte_count = 0;
468 scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY);
469 scat[i].addr = 0;
470 }
471 }
472
473 if (likely(nreq)) {
474 srq->wqe_ctr += nreq;
475
476
477
478
479 wmb();
480
481 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
482 }
483 out:
484 spin_unlock_irqrestore(&srq->lock, flags);
485
486 return err;
487 }