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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 = mlx5_vzalloc(sizeof(*in->pas) * ncont);
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 int page_shift;
169 int npages;
170
171 err = mlx5_db_alloc(dev->mdev, &srq->db);
172 if (err) {
173 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
174 return err;
175 }
176
177 if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) {
178 mlx5_ib_dbg(dev, "buf alloc failed\n");
179 err = -ENOMEM;
180 goto err_db;
181 }
182 page_shift = srq->buf.page_shift;
183
184 srq->head = 0;
185 srq->tail = srq->msrq.max - 1;
186 srq->wqe_ctr = 0;
187
188 for (i = 0; i < srq->msrq.max; i++) {
189 next = get_wqe(srq, i);
190 next->next_wqe_index =
191 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
192 }
193
194 npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
195 mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
196 buf_size, page_shift, srq->buf.npages, npages);
197 in->pas = mlx5_vzalloc(sizeof(*in->pas) * npages);
198 if (!in->pas) {
199 err = -ENOMEM;
200 goto err_buf;
201 }
202 mlx5_fill_page_array(&srq->buf, in->pas);
203
204 srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
205 if (!srq->wrid) {
206 err = -ENOMEM;
207 goto err_in;
208 }
209 srq->wq_sig = !!srq_signature;
210
211 in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
212 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
213 in->type == IB_SRQT_XRC)
214 in->user_index = MLX5_IB_DEFAULT_UIDX;
215
216 return 0;
217
218err_in:
219 kvfree(in->pas);
220
221err_buf:
222 mlx5_buf_free(dev->mdev, &srq->buf);
223
224err_db:
225 mlx5_db_free(dev->mdev, &srq->db);
226 return err;
227}
228
229static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
230{
231 mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
232 ib_umem_release(srq->umem);
233}
234
235
236static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
237{
238 kfree(srq->wrid);
239 mlx5_buf_free(dev->mdev, &srq->buf);
240 mlx5_db_free(dev->mdev, &srq->db);
241}
242
243struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
244 struct ib_srq_init_attr *init_attr,
245 struct ib_udata *udata)
246{
247 struct mlx5_ib_dev *dev = to_mdev(pd->device);
248 struct mlx5_ib_srq *srq;
249 int desc_size;
250 int buf_size;
251 int err;
252 struct mlx5_srq_attr in = {0};
253 __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
254
255
256 if (init_attr->attr.max_wr >= max_srq_wqes) {
257 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
258 init_attr->attr.max_wr,
259 max_srq_wqes);
260 return ERR_PTR(-EINVAL);
261 }
262
263 srq = kmalloc(sizeof(*srq), GFP_KERNEL);
264 if (!srq)
265 return ERR_PTR(-ENOMEM);
266
267 mutex_init(&srq->mutex);
268 spin_lock_init(&srq->lock);
269 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
270 srq->msrq.max_gs = init_attr->attr.max_sge;
271
272 desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
273 srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
274 desc_size = roundup_pow_of_two(desc_size);
275 desc_size = max_t(int, 32, desc_size);
276 srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
277 sizeof(struct mlx5_wqe_data_seg);
278 srq->msrq.wqe_shift = ilog2(desc_size);
279 buf_size = srq->msrq.max * desc_size;
280 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",
281 desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
282 srq->msrq.max_avail_gather);
283 in.type = init_attr->srq_type;
284
285 if (pd->uobject)
286 err = create_srq_user(pd, srq, &in, udata, buf_size);
287 else
288 err = create_srq_kernel(dev, srq, &in, buf_size);
289
290 if (err) {
291 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
292 pd->uobject ? "user" : "kernel", err);
293 goto err_srq;
294 }
295
296 in.log_size = ilog2(srq->msrq.max);
297 in.wqe_shift = srq->msrq.wqe_shift - 4;
298 if (srq->wq_sig)
299 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
300 if (init_attr->srq_type == IB_SRQT_XRC) {
301 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
302 in.cqn = to_mcq(init_attr->ext.xrc.cq)->mcq.cqn;
303 } else if (init_attr->srq_type == IB_SRQT_BASIC) {
304 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
305 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
306 }
307
308 in.pd = to_mpd(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 (pd->uobject)
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 &srq->ibsrq;
332
333err_core:
334 mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
335
336err_usr_kern_srq:
337 if (pd->uobject)
338 destroy_srq_user(pd, srq);
339 else
340 destroy_srq_kernel(dev, srq);
341
342err_srq:
343 kfree(srq);
344
345 return ERR_PTR(err);
346}
347
348int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
349 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
350{
351 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
352 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
353 int ret;
354
355
356 if (attr_mask & IB_SRQ_MAX_WR)
357 return -EINVAL;
358
359 if (attr_mask & IB_SRQ_LIMIT) {
360 if (attr->srq_limit >= srq->msrq.max)
361 return -EINVAL;
362
363 mutex_lock(&srq->mutex);
364 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
365 mutex_unlock(&srq->mutex);
366
367 if (ret)
368 return ret;
369 }
370
371 return 0;
372}
373
374int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
375{
376 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
377 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
378 int ret;
379 struct mlx5_srq_attr *out;
380
381 out = kzalloc(sizeof(*out), GFP_KERNEL);
382 if (!out)
383 return -ENOMEM;
384
385 ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
386 if (ret)
387 goto out_box;
388
389 srq_attr->srq_limit = out->lwm;
390 srq_attr->max_wr = srq->msrq.max - 1;
391 srq_attr->max_sge = srq->msrq.max_gs;
392
393out_box:
394 kfree(out);
395 return ret;
396}
397
398int mlx5_ib_destroy_srq(struct ib_srq *srq)
399{
400 struct mlx5_ib_dev *dev = to_mdev(srq->device);
401 struct mlx5_ib_srq *msrq = to_msrq(srq);
402
403 mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
404
405 if (srq->uobject) {
406 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
407 ib_umem_release(msrq->umem);
408 } else {
409 destroy_srq_kernel(dev, msrq);
410 }
411
412 kfree(srq);
413 return 0;
414}
415
416void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
417{
418 struct mlx5_wqe_srq_next_seg *next;
419
420
421 spin_lock(&srq->lock);
422
423 next = get_wqe(srq, srq->tail);
424 next->next_wqe_index = cpu_to_be16(wqe_index);
425 srq->tail = wqe_index;
426
427 spin_unlock(&srq->lock);
428}
429
430int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
431 struct ib_recv_wr **bad_wr)
432{
433 struct mlx5_ib_srq *srq = to_msrq(ibsrq);
434 struct mlx5_wqe_srq_next_seg *next;
435 struct mlx5_wqe_data_seg *scat;
436 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
437 struct mlx5_core_dev *mdev = dev->mdev;
438 unsigned long flags;
439 int err = 0;
440 int nreq;
441 int i;
442
443 spin_lock_irqsave(&srq->lock, flags);
444
445 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
446 err = -EIO;
447 *bad_wr = wr;
448 goto out;
449 }
450
451 for (nreq = 0; wr; nreq++, wr = wr->next) {
452 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
453 err = -EINVAL;
454 *bad_wr = wr;
455 break;
456 }
457
458 if (unlikely(srq->head == srq->tail)) {
459 err = -ENOMEM;
460 *bad_wr = wr;
461 break;
462 }
463
464 srq->wrid[srq->head] = wr->wr_id;
465
466 next = get_wqe(srq, srq->head);
467 srq->head = be16_to_cpu(next->next_wqe_index);
468 scat = (struct mlx5_wqe_data_seg *)(next + 1);
469
470 for (i = 0; i < wr->num_sge; i++) {
471 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
472 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
473 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
474 }
475
476 if (i < srq->msrq.max_avail_gather) {
477 scat[i].byte_count = 0;
478 scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY);
479 scat[i].addr = 0;
480 }
481 }
482
483 if (likely(nreq)) {
484 srq->wqe_ctr += nreq;
485
486
487
488
489 wmb();
490
491 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
492 }
493out:
494 spin_unlock_irqrestore(&srq->lock, flags);
495
496 return err;
497}
498
