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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>
39
40#include "mlx5_ib.h"
41
42
43static int srq_signature;
44
45static 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
50static 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
75static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
76 struct mlx5_srq_attr *in,
77 struct ib_udata *udata, int buf_size)
78{
79 struct mlx5_ib_dev *dev = to_mdev(pd->device);
80 struct mlx5_ib_create_srq ucmd = {};
81 size_t ucmdlen;
82 int err;
83 int npages;
84 int page_shift;
85 int ncont;
86 u32 offset;
87 u32 uidx = MLX5_IB_DEFAULT_UIDX;
88
89 ucmdlen = min(udata->inlen, sizeof(ucmd));
90
91 if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
92 mlx5_ib_dbg(dev, "failed copy udata\n");
93 return -EFAULT;
94 }
95
96 if (ucmd.reserved0 || ucmd.reserved1)
97 return -EINVAL;
98
99 if (udata->inlen > sizeof(ucmd) &&
100 !ib_is_udata_cleared(udata, sizeof(ucmd),
101 udata->inlen - sizeof(ucmd)))
102 return -EINVAL;
103
104 if (in->type == IB_SRQT_XRC) {
105 err = get_srq_user_index(to_mucontext(pd->uobject->context),
106 &ucmd, udata->inlen, &uidx);
107 if (err)
108 return err;
109 }
110
111 srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
112
113 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
114 0, 0);
115 if (IS_ERR(srq->umem)) {
116 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
117 err = PTR_ERR(srq->umem);
118 return err;
119 }
120
121 mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, 0, &npages,
122 &page_shift, &ncont, NULL);
123 err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
124 &offset);
125 if (err) {
126 mlx5_ib_warn(dev, "bad offset\n");
127 goto err_umem;
128 }
129
130 in->pas = kvzalloc(sizeof(*in->pas) * ncont, GFP_KERNEL);
131 if (!in->pas) {
132 err = -ENOMEM;
133 goto err_umem;
134 }
135
136 mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0);
137
138 err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
139 ucmd.db_addr, &srq->db);
140 if (err) {
141 mlx5_ib_dbg(dev, "map doorbell failed\n");
142 goto err_in;
143 }
144
145 in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
146 in->page_offset = offset;
147 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
148 in->type == IB_SRQT_XRC)
149 in->user_index = uidx;
150
151 return 0;
152
153err_in:
154 kvfree(in->pas);
155
156err_umem:
157 ib_umem_release(srq->umem);
158
159 return err;
160}
161
162static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
163 struct mlx5_srq_attr *in, int buf_size)
164{
165 int err;
166 int i;
167 struct mlx5_wqe_srq_next_seg *next;
168
169 err = mlx5_db_alloc(dev->mdev, &srq->db);
170 if (err) {
171 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
172 return err;
173 }
174
175 if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) {
176 mlx5_ib_dbg(dev, "buf alloc failed\n");
177 err = -ENOMEM;
178 goto err_db;
179 }
180
181 srq->head = 0;
182 srq->tail = srq->msrq.max - 1;
183 srq->wqe_ctr = 0;
184
185 for (i = 0; i < srq->msrq.max; i++) {
186 next = get_wqe(srq, i);
187 next->next_wqe_index =
188 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
189 }
190
191 mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
192 in->pas = kvzalloc(sizeof(*in->pas) * srq->buf.npages, GFP_KERNEL);
193 if (!in->pas) {
194 err = -ENOMEM;
195 goto err_buf;
196 }
197 mlx5_fill_page_array(&srq->buf, in->pas);
198
199 srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
200 if (!srq->wrid) {
201 err = -ENOMEM;
202 goto err_in;
203 }
204 srq->wq_sig = !!srq_signature;
205
206 in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
207 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
208 in->type == IB_SRQT_XRC)
209 in->user_index = MLX5_IB_DEFAULT_UIDX;
210
211 return 0;
212
213err_in:
214 kvfree(in->pas);
215
216err_buf:
217 mlx5_buf_free(dev->mdev, &srq->buf);
218
219err_db:
220 mlx5_db_free(dev->mdev, &srq->db);
221 return err;
222}
223
224static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
225{
226 mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
227 ib_umem_release(srq->umem);
228}
229
230
231static 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
238struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
239 struct ib_srq_init_attr *init_attr,
240 struct ib_udata *udata)
241{
242 struct mlx5_ib_dev *dev = to_mdev(pd->device);
243 struct mlx5_ib_srq *srq;
244 int desc_size;
245 int buf_size;
246 int err;
247 struct mlx5_srq_attr in = {0};
248 __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
249
250
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 ERR_PTR(-EINVAL);
256 }
257
258 srq = kmalloc(sizeof(*srq), GFP_KERNEL);
259 if (!srq)
260 return ERR_PTR(-ENOMEM);
261
262 mutex_init(&srq->mutex);
263 spin_lock_init(&srq->lock);
264 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
265 srq->msrq.max_gs = init_attr->attr.max_sge;
266
267 desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
268 srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
269 desc_size = roundup_pow_of_two(desc_size);
270 desc_size = max_t(int, 32, desc_size);
271 srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
272 sizeof(struct mlx5_wqe_data_seg);
273 srq->msrq.wqe_shift = ilog2(desc_size);
274 buf_size = srq->msrq.max * desc_size;
275 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",
276 desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
277 srq->msrq.max_avail_gather);
278 in.type = init_attr->srq_type;
279
280 if (pd->uobject)
281 err = create_srq_user(pd, srq, &in, udata, buf_size);
282 else
283 err = create_srq_kernel(dev, srq, &in, buf_size);
284
285 if (err) {
286 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
287 pd->uobject ? "user" : "kernel", err);
288 goto err_srq;
289 }
290
291 in.log_size = ilog2(srq->msrq.max);
292 in.wqe_shift = srq->msrq.wqe_shift - 4;
293 if (srq->wq_sig)
294 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
295 if (init_attr->srq_type == IB_SRQT_XRC) {
296 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
297 in.cqn = to_mcq(init_attr->ext.xrc.cq)->mcq.cqn;
298 } else if (init_attr->srq_type == IB_SRQT_BASIC) {
299 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
300 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
301 }
302
303 in.pd = to_mpd(pd)->pdn;
304 in.db_record = srq->db.dma;
305 err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in);
306 kvfree(in.pas);
307 if (err) {
308 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
309 goto err_usr_kern_srq;
310 }
311
312 mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
313
314 srq->msrq.event = mlx5_ib_srq_event;
315 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
316
317 if (pd->uobject)
318 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
319 mlx5_ib_dbg(dev, "copy to user failed\n");
320 err = -EFAULT;
321 goto err_core;
322 }
323
324 init_attr->attr.max_wr = srq->msrq.max - 1;
325
326 return &srq->ibsrq;
327
328err_core:
329 mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
330
331err_usr_kern_srq:
332 if (pd->uobject)
333 destroy_srq_user(pd, srq);
334 else
335 destroy_srq_kernel(dev, srq);
336
337err_srq:
338 kfree(srq);
339
340 return ERR_PTR(err);
341}
342
343int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
344 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
345{
346 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
347 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
348 int ret;
349
350
351 if (attr_mask & IB_SRQ_MAX_WR)
352 return -EINVAL;
353
354 if (attr_mask & IB_SRQ_LIMIT) {
355 if (attr->srq_limit >= srq->msrq.max)
356 return -EINVAL;
357
358 mutex_lock(&srq->mutex);
359 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
360 mutex_unlock(&srq->mutex);
361
362 if (ret)
363 return ret;
364 }
365
366 return 0;
367}
368
369int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
370{
371 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
372 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
373 int ret;
374 struct mlx5_srq_attr *out;
375
376 out = kzalloc(sizeof(*out), GFP_KERNEL);
377 if (!out)
378 return -ENOMEM;
379
380 ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
381 if (ret)
382 goto out_box;
383
384 srq_attr->srq_limit = out->lwm;
385 srq_attr->max_wr = srq->msrq.max - 1;
386 srq_attr->max_sge = srq->msrq.max_gs;
387
388out_box:
389 kfree(out);
390 return ret;
391}
392
393int mlx5_ib_destroy_srq(struct ib_srq *srq)
394{
395 struct mlx5_ib_dev *dev = to_mdev(srq->device);
396 struct mlx5_ib_srq *msrq = to_msrq(srq);
397
398 mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
399
400 if (srq->uobject) {
401 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
402 ib_umem_release(msrq->umem);
403 } else {
404 destroy_srq_kernel(dev, msrq);
405 }
406
407 kfree(srq);
408 return 0;
409}
410
411void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
412{
413 struct mlx5_wqe_srq_next_seg *next;
414
415
416 spin_lock(&srq->lock);
417
418 next = get_wqe(srq, srq->tail);
419 next->next_wqe_index = cpu_to_be16(wqe_index);
420 srq->tail = wqe_index;
421
422 spin_unlock(&srq->lock);
423}
424
425int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
426 struct ib_recv_wr **bad_wr)
427{
428 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
429 struct mlx5_wqe_srq_next_seg *next;
430 struct mlx5_wqe_data_seg *scat;
431 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
432 struct mlx5_core_dev *mdev = dev->mdev;
433 unsigned long flags;
434 int err = 0;
435 int nreq;
436 int i;
437
438 spin_lock_irqsave(&srq->lock, flags);
439
440 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
441 err = -EIO;
442 *bad_wr = wr;
443 goto out;
444 }
445
446 for (nreq = 0; wr; nreq++, wr = wr->next) {
447 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
448 err = -EINVAL;
449 *bad_wr = wr;
450 break;
451 }
452
453 if (unlikely(srq->head == srq->tail)) {
454 err = -ENOMEM;
455 *bad_wr = wr;
456 break;
457 }
458
459 srq->wrid[srq->head] = wr->wr_id;
460
461 next = get_wqe(srq, srq->head);
462 srq->head = be16_to_cpu(next->next_wqe_index);
463 scat = (struct mlx5_wqe_data_seg *)(next + 1);
464
465 for (i = 0; i < wr->num_sge; i++) {
466 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
467 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
468 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
469 }
470
471 if (i < srq->msrq.max_avail_gather) {
472 scat[i].byte_count = 0;
473 scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY);
474 scat[i].addr = 0;
475 }
476 }
477
478 if (likely(nreq)) {
479 srq->wqe_ctr += nreq;
480
481
482
483
484 wmb();
485
486 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
487 }
488out:
489 spin_unlock_irqrestore(&srq->lock, flags);
490
491 return err;
492}
493
