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1 | /* | |
2 | * Copyright (c) 2013, Mellanox Technologies inc. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | */ | |
32 | ||
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 | #include "user.h" | |
42 | ||
43 | /* not supported currently */ | |
44 | static int srq_signature; | |
45 | ||
46 | static void *get_wqe(struct mlx5_ib_srq *srq, int n) | |
47 | { | |
48 | return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); | |
49 | } | |
50 | ||
51 | static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type) | |
52 | { | |
53 | struct ib_event event; | |
54 | struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; | |
55 | ||
56 | if (ibsrq->event_handler) { | |
57 | event.device = ibsrq->device; | |
58 | event.element.srq = ibsrq; | |
59 | switch (type) { | |
60 | case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT: | |
61 | event.event = IB_EVENT_SRQ_LIMIT_REACHED; | |
62 | break; | |
63 | case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR: | |
64 | event.event = IB_EVENT_SRQ_ERR; | |
65 | break; | |
66 | default: | |
67 | pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n", | |
68 | type, srq->srqn); | |
69 | return; | |
70 | } | |
71 | ||
72 | ibsrq->event_handler(&event, ibsrq->srq_context); | |
73 | } | |
74 | } | |
75 | ||
76 | static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq, | |
77 | struct mlx5_create_srq_mbox_in **in, | |
78 | struct ib_udata *udata, int buf_size, int *inlen) | |
79 | { | |
80 | struct mlx5_ib_dev *dev = to_mdev(pd->device); | |
81 | struct mlx5_ib_create_srq ucmd; | |
82 | size_t ucmdlen; | |
83 | int err; | |
84 | int npages; | |
85 | int page_shift; | |
86 | int ncont; | |
87 | u32 offset; | |
88 | ||
89 | ucmdlen = | |
90 | (udata->inlen - sizeof(struct ib_uverbs_cmd_hdr) < | |
91 | sizeof(ucmd)) ? (sizeof(ucmd) - | |
92 | sizeof(ucmd.reserved)) : sizeof(ucmd); | |
93 | ||
94 | if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) { | |
95 | mlx5_ib_dbg(dev, "failed copy udata\n"); | |
96 | return -EFAULT; | |
97 | } | |
98 | ||
99 | if (ucmdlen == sizeof(ucmd) && | |
100 | ucmd.reserved != 0) | |
101 | return -EINVAL; | |
102 | ||
103 | srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE); | |
104 | ||
105 | srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size, | |
106 | 0, 0); | |
107 | if (IS_ERR(srq->umem)) { | |
108 | mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size); | |
109 | err = PTR_ERR(srq->umem); | |
110 | return err; | |
111 | } | |
112 | ||
113 | mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages, | |
114 | &page_shift, &ncont, NULL); | |
115 | err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift, | |
116 | &offset); | |
117 | if (err) { | |
118 | mlx5_ib_warn(dev, "bad offset\n"); | |
119 | goto err_umem; | |
120 | } | |
121 | ||
122 | *inlen = sizeof(**in) + sizeof(*(*in)->pas) * ncont; | |
123 | *in = mlx5_vzalloc(*inlen); | |
124 | if (!(*in)) { | |
125 | err = -ENOMEM; | |
126 | goto err_umem; | |
127 | } | |
128 | ||
129 | mlx5_ib_populate_pas(dev, srq->umem, page_shift, (*in)->pas, 0); | |
130 | ||
131 | err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context), | |
132 | 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)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT; | |
139 | (*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26); | |
140 | ||
141 | return 0; | |
142 | ||
143 | err_in: | |
144 | kvfree(*in); | |
145 | ||
146 | err_umem: | |
147 | ib_umem_release(srq->umem); | |
148 | ||
149 | return err; | |
150 | } | |
151 | ||
152 | static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq, | |
153 | struct mlx5_create_srq_mbox_in **in, int buf_size, | |
154 | int *inlen) | |
155 | { | |
156 | int err; | |
157 | int i; | |
158 | struct mlx5_wqe_srq_next_seg *next; | |
159 | int page_shift; | |
160 | int npages; | |
161 | ||
162 | err = mlx5_db_alloc(dev->mdev, &srq->db); | |
163 | if (err) { | |
164 | mlx5_ib_warn(dev, "alloc dbell rec failed\n"); | |
165 | return err; | |
166 | } | |
167 | ||
168 | *srq->db.db = 0; | |
169 | ||
170 | if (mlx5_buf_alloc(dev->mdev, buf_size, PAGE_SIZE * 2, &srq->buf)) { | |
171 | mlx5_ib_dbg(dev, "buf alloc failed\n"); | |
172 | err = -ENOMEM; | |
173 | goto err_db; | |
174 | } | |
175 | page_shift = srq->buf.page_shift; | |
176 | ||
177 | srq->head = 0; | |
178 | srq->tail = srq->msrq.max - 1; | |
179 | srq->wqe_ctr = 0; | |
180 | ||
181 | for (i = 0; i < srq->msrq.max; i++) { | |
182 | next = get_wqe(srq, i); | |
183 | next->next_wqe_index = | |
184 | cpu_to_be16((i + 1) & (srq->msrq.max - 1)); | |
185 | } | |
186 | ||
187 | npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT)); | |
188 | mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n", | |
189 | buf_size, page_shift, srq->buf.npages, npages); | |
190 | *inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages; | |
191 | *in = mlx5_vzalloc(*inlen); | |
192 | if (!*in) { | |
193 | err = -ENOMEM; | |
194 | goto err_buf; | |
195 | } | |
196 | mlx5_fill_page_array(&srq->buf, (*in)->pas); | |
197 | ||
198 | srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL); | |
199 | if (!srq->wrid) { | |
200 | mlx5_ib_dbg(dev, "kmalloc failed %lu\n", | |
201 | (unsigned long)(srq->msrq.max * sizeof(u64))); | |
202 | err = -ENOMEM; | |
203 | goto err_in; | |
204 | } | |
205 | srq->wq_sig = !!srq_signature; | |
206 | ||
207 | (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT; | |
208 | ||
209 | return 0; | |
210 | ||
211 | err_in: | |
212 | kvfree(*in); | |
213 | ||
214 | err_buf: | |
215 | mlx5_buf_free(dev->mdev, &srq->buf); | |
216 | ||
217 | err_db: | |
218 | mlx5_db_free(dev->mdev, &srq->db); | |
219 | return err; | |
220 | } | |
221 | ||
222 | static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq) | |
223 | { | |
224 | mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); | |
225 | ib_umem_release(srq->umem); | |
226 | } | |
227 | ||
228 | ||
229 | static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq) | |
230 | { | |
231 | kfree(srq->wrid); | |
232 | mlx5_buf_free(dev->mdev, &srq->buf); | |
233 | mlx5_db_free(dev->mdev, &srq->db); | |
234 | } | |
235 | ||
236 | struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd, | |
237 | struct ib_srq_init_attr *init_attr, | |
238 | struct ib_udata *udata) | |
239 | { | |
240 | struct mlx5_ib_dev *dev = to_mdev(pd->device); | |
241 | struct mlx5_general_caps *gen; | |
242 | struct mlx5_ib_srq *srq; | |
243 | int desc_size; | |
244 | int buf_size; | |
245 | int err; | |
246 | struct mlx5_create_srq_mbox_in *uninitialized_var(in); | |
247 | int uninitialized_var(inlen); | |
248 | int is_xrc; | |
249 | u32 flgs, xrcdn; | |
250 | ||
251 | gen = &dev->mdev->caps.gen; | |
252 | /* Sanity check SRQ size before proceeding */ | |
253 | if (init_attr->attr.max_wr >= gen->max_srq_wqes) { | |
254 | mlx5_ib_dbg(dev, "max_wr %d, cap %d\n", | |
255 | init_attr->attr.max_wr, | |
256 | gen->max_srq_wqes); | |
257 | return ERR_PTR(-EINVAL); | |
258 | } | |
259 | ||
260 | srq = kmalloc(sizeof(*srq), GFP_KERNEL); | |
261 | if (!srq) | |
262 | return ERR_PTR(-ENOMEM); | |
263 | ||
264 | mutex_init(&srq->mutex); | |
265 | spin_lock_init(&srq->lock); | |
266 | srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); | |
267 | srq->msrq.max_gs = init_attr->attr.max_sge; | |
268 | ||
269 | desc_size = sizeof(struct mlx5_wqe_srq_next_seg) + | |
270 | srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg); | |
271 | desc_size = roundup_pow_of_two(desc_size); | |
272 | desc_size = max_t(int, 32, desc_size); | |
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 | 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", | |
278 | desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs, | |
279 | srq->msrq.max_avail_gather); | |
280 | ||
281 | if (pd->uobject) | |
282 | err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen); | |
283 | else | |
284 | err = create_srq_kernel(dev, srq, &in, buf_size, &inlen); | |
285 | ||
286 | if (err) { | |
287 | mlx5_ib_warn(dev, "create srq %s failed, err %d\n", | |
288 | pd->uobject ? "user" : "kernel", err); | |
289 | goto err_srq; | |
290 | } | |
291 | ||
292 | is_xrc = (init_attr->srq_type == IB_SRQT_XRC); | |
293 | in->ctx.state_log_sz = ilog2(srq->msrq.max); | |
294 | flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24; | |
295 | xrcdn = 0; | |
296 | if (is_xrc) { | |
297 | xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn; | |
298 | in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn); | |
299 | } else if (init_attr->srq_type == IB_SRQT_BASIC) { | |
300 | xrcdn = to_mxrcd(dev->devr.x0)->xrcdn; | |
301 | in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn); | |
302 | } | |
303 | ||
304 | in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF)); | |
305 | ||
306 | in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn); | |
307 | in->ctx.db_record = cpu_to_be64(srq->db.dma); | |
308 | err = mlx5_core_create_srq(dev->mdev, &srq->msrq, in, inlen); | |
309 | kvfree(in); | |
310 | if (err) { | |
311 | mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err); | |
312 | goto err_usr_kern_srq; | |
313 | } | |
314 | ||
315 | mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn); | |
316 | ||
317 | srq->msrq.event = mlx5_ib_srq_event; | |
318 | srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; | |
319 | ||
320 | if (pd->uobject) | |
321 | if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) { | |
322 | mlx5_ib_dbg(dev, "copy to user failed\n"); | |
323 | err = -EFAULT; | |
324 | goto err_core; | |
325 | } | |
326 | ||
327 | init_attr->attr.max_wr = srq->msrq.max - 1; | |
328 | ||
329 | return &srq->ibsrq; | |
330 | ||
331 | err_core: | |
332 | mlx5_core_destroy_srq(dev->mdev, &srq->msrq); | |
333 | ||
334 | err_usr_kern_srq: | |
335 | if (pd->uobject) | |
336 | destroy_srq_user(pd, srq); | |
337 | else | |
338 | destroy_srq_kernel(dev, srq); | |
339 | ||
340 | err_srq: | |
341 | kfree(srq); | |
342 | ||
343 | return ERR_PTR(err); | |
344 | } | |
345 | ||
346 | int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, | |
347 | enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) | |
348 | { | |
349 | struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); | |
350 | struct mlx5_ib_srq *srq = to_msrq(ibsrq); | |
351 | int ret; | |
352 | ||
353 | /* We don't support resizing SRQs yet */ | |
354 | if (attr_mask & IB_SRQ_MAX_WR) | |
355 | return -EINVAL; | |
356 | ||
357 | if (attr_mask & IB_SRQ_LIMIT) { | |
358 | if (attr->srq_limit >= srq->msrq.max) | |
359 | return -EINVAL; | |
360 | ||
361 | mutex_lock(&srq->mutex); | |
362 | ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1); | |
363 | mutex_unlock(&srq->mutex); | |
364 | ||
365 | if (ret) | |
366 | return ret; | |
367 | } | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) | |
373 | { | |
374 | struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); | |
375 | struct mlx5_ib_srq *srq = to_msrq(ibsrq); | |
376 | int ret; | |
377 | struct mlx5_query_srq_mbox_out *out; | |
378 | ||
379 | out = kzalloc(sizeof(*out), GFP_KERNEL); | |
380 | if (!out) | |
381 | return -ENOMEM; | |
382 | ||
383 | ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out); | |
384 | if (ret) | |
385 | goto out_box; | |
386 | ||
387 | srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm); | |
388 | srq_attr->max_wr = srq->msrq.max - 1; | |
389 | srq_attr->max_sge = srq->msrq.max_gs; | |
390 | ||
391 | out_box: | |
392 | kfree(out); | |
393 | return ret; | |
394 | } | |
395 | ||
396 | int mlx5_ib_destroy_srq(struct ib_srq *srq) | |
397 | { | |
398 | struct mlx5_ib_dev *dev = to_mdev(srq->device); | |
399 | struct mlx5_ib_srq *msrq = to_msrq(srq); | |
400 | ||
401 | mlx5_core_destroy_srq(dev->mdev, &msrq->msrq); | |
402 | ||
403 | if (srq->uobject) { | |
404 | mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); | |
405 | ib_umem_release(msrq->umem); | |
406 | } else { | |
407 | destroy_srq_kernel(dev, msrq); | |
408 | } | |
409 | ||
410 | kfree(srq); | |
411 | return 0; | |
412 | } | |
413 | ||
414 | void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index) | |
415 | { | |
416 | struct mlx5_wqe_srq_next_seg *next; | |
417 | ||
418 | /* always called with interrupts disabled. */ | |
419 | spin_lock(&srq->lock); | |
420 | ||
421 | next = get_wqe(srq, srq->tail); | |
422 | next->next_wqe_index = cpu_to_be16(wqe_index); | |
423 | srq->tail = wqe_index; | |
424 | ||
425 | spin_unlock(&srq->lock); | |
426 | } | |
427 | ||
428 | int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, | |
429 | struct ib_recv_wr **bad_wr) | |
430 | { | |
431 | struct mlx5_ib_srq *srq = to_msrq(ibsrq); | |
432 | struct mlx5_wqe_srq_next_seg *next; | |
433 | struct mlx5_wqe_data_seg *scat; | |
434 | unsigned long flags; | |
435 | int err = 0; | |
436 | int nreq; | |
437 | int i; | |
438 | ||
439 | spin_lock_irqsave(&srq->lock, flags); | |
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 | /* Make sure that descriptors are written before | |
477 | * doorbell record. | |
478 | */ | |
479 | wmb(); | |
480 | ||
481 | *srq->db.db = cpu_to_be32(srq->wqe_ctr); | |
482 | } | |
483 | ||
484 | spin_unlock_irqrestore(&srq->lock, flags); | |
485 | ||
486 | return err; | |
487 | } |