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e126ba97 | 1 | /* |
6cf0a15f | 2 | * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. |
e126ba97 EC |
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> | |
43bc8893 | 38 | #include <rdma/ib_user_verbs.h> |
e126ba97 EC |
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; | |
43bc8893 | 82 | size_t ucmdlen; |
e126ba97 EC |
83 | int err; |
84 | int npages; | |
85 | int page_shift; | |
86 | int ncont; | |
87 | u32 offset; | |
88 | ||
43bc8893 YD |
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)) { | |
e126ba97 EC |
95 | mlx5_ib_dbg(dev, "failed copy udata\n"); |
96 | return -EFAULT; | |
97 | } | |
43bc8893 YD |
98 | |
99 | if (ucmdlen == sizeof(ucmd) && | |
100 | ucmd.reserved != 0) | |
101 | return -EINVAL; | |
102 | ||
e126ba97 EC |
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 | ||
1b77d2bd | 138 | (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT; |
e126ba97 EC |
139 | (*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26); |
140 | ||
141 | return 0; | |
142 | ||
143 | err_in: | |
479163f4 | 144 | kvfree(*in); |
e126ba97 EC |
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 | ||
9603b61d | 162 | err = mlx5_db_alloc(dev->mdev, &srq->db); |
e126ba97 EC |
163 | if (err) { |
164 | mlx5_ib_warn(dev, "alloc dbell rec failed\n"); | |
165 | return err; | |
166 | } | |
167 | ||
64ffaa21 | 168 | if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) { |
e126ba97 EC |
169 | mlx5_ib_dbg(dev, "buf alloc failed\n"); |
170 | err = -ENOMEM; | |
171 | goto err_db; | |
172 | } | |
173 | page_shift = srq->buf.page_shift; | |
174 | ||
175 | srq->head = 0; | |
176 | srq->tail = srq->msrq.max - 1; | |
177 | srq->wqe_ctr = 0; | |
178 | ||
179 | for (i = 0; i < srq->msrq.max; i++) { | |
180 | next = get_wqe(srq, i); | |
181 | next->next_wqe_index = | |
182 | cpu_to_be16((i + 1) & (srq->msrq.max - 1)); | |
183 | } | |
184 | ||
185 | npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT)); | |
186 | mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n", | |
187 | buf_size, page_shift, srq->buf.npages, npages); | |
188 | *inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages; | |
189 | *in = mlx5_vzalloc(*inlen); | |
190 | if (!*in) { | |
191 | err = -ENOMEM; | |
192 | goto err_buf; | |
193 | } | |
194 | mlx5_fill_page_array(&srq->buf, (*in)->pas); | |
195 | ||
196 | srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL); | |
197 | if (!srq->wrid) { | |
198 | mlx5_ib_dbg(dev, "kmalloc failed %lu\n", | |
199 | (unsigned long)(srq->msrq.max * sizeof(u64))); | |
200 | err = -ENOMEM; | |
201 | goto err_in; | |
202 | } | |
203 | srq->wq_sig = !!srq_signature; | |
204 | ||
1b77d2bd | 205 | (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT; |
e126ba97 EC |
206 | |
207 | return 0; | |
208 | ||
209 | err_in: | |
479163f4 | 210 | kvfree(*in); |
e126ba97 EC |
211 | |
212 | err_buf: | |
9603b61d | 213 | mlx5_buf_free(dev->mdev, &srq->buf); |
e126ba97 EC |
214 | |
215 | err_db: | |
9603b61d | 216 | mlx5_db_free(dev->mdev, &srq->db); |
e126ba97 EC |
217 | return err; |
218 | } | |
219 | ||
220 | static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq) | |
221 | { | |
222 | mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); | |
223 | ib_umem_release(srq->umem); | |
224 | } | |
225 | ||
226 | ||
227 | static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq) | |
228 | { | |
229 | kfree(srq->wrid); | |
9603b61d JM |
230 | mlx5_buf_free(dev->mdev, &srq->buf); |
231 | mlx5_db_free(dev->mdev, &srq->db); | |
e126ba97 EC |
232 | } |
233 | ||
234 | struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd, | |
235 | struct ib_srq_init_attr *init_attr, | |
236 | struct ib_udata *udata) | |
237 | { | |
238 | struct mlx5_ib_dev *dev = to_mdev(pd->device); | |
239 | struct mlx5_ib_srq *srq; | |
240 | int desc_size; | |
241 | int buf_size; | |
242 | int err; | |
243 | struct mlx5_create_srq_mbox_in *uninitialized_var(in); | |
244 | int uninitialized_var(inlen); | |
245 | int is_xrc; | |
246 | u32 flgs, xrcdn; | |
938fe83c | 247 | __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz); |
e126ba97 EC |
248 | |
249 | /* Sanity check SRQ size before proceeding */ | |
938fe83c | 250 | if (init_attr->attr.max_wr >= max_srq_wqes) { |
e126ba97 EC |
251 | mlx5_ib_dbg(dev, "max_wr %d, cap %d\n", |
252 | init_attr->attr.max_wr, | |
938fe83c | 253 | max_srq_wqes); |
e126ba97 EC |
254 | return ERR_PTR(-EINVAL); |
255 | } | |
256 | ||
257 | srq = kmalloc(sizeof(*srq), GFP_KERNEL); | |
258 | if (!srq) | |
259 | return ERR_PTR(-ENOMEM); | |
260 | ||
261 | mutex_init(&srq->mutex); | |
262 | spin_lock_init(&srq->lock); | |
263 | srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); | |
264 | srq->msrq.max_gs = init_attr->attr.max_sge; | |
265 | ||
266 | desc_size = sizeof(struct mlx5_wqe_srq_next_seg) + | |
267 | srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg); | |
268 | desc_size = roundup_pow_of_two(desc_size); | |
269 | desc_size = max_t(int, 32, desc_size); | |
270 | srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) / | |
271 | sizeof(struct mlx5_wqe_data_seg); | |
272 | srq->msrq.wqe_shift = ilog2(desc_size); | |
273 | buf_size = srq->msrq.max * desc_size; | |
274 | 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", | |
275 | desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs, | |
276 | srq->msrq.max_avail_gather); | |
277 | ||
278 | if (pd->uobject) | |
279 | err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen); | |
280 | else | |
281 | err = create_srq_kernel(dev, srq, &in, buf_size, &inlen); | |
282 | ||
283 | if (err) { | |
284 | mlx5_ib_warn(dev, "create srq %s failed, err %d\n", | |
285 | pd->uobject ? "user" : "kernel", err); | |
286 | goto err_srq; | |
287 | } | |
288 | ||
289 | is_xrc = (init_attr->srq_type == IB_SRQT_XRC); | |
290 | in->ctx.state_log_sz = ilog2(srq->msrq.max); | |
291 | flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24; | |
292 | xrcdn = 0; | |
293 | if (is_xrc) { | |
294 | xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn; | |
295 | in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn); | |
296 | } else if (init_attr->srq_type == IB_SRQT_BASIC) { | |
297 | xrcdn = to_mxrcd(dev->devr.x0)->xrcdn; | |
298 | in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn); | |
299 | } | |
300 | ||
301 | in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF)); | |
302 | ||
303 | in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn); | |
304 | in->ctx.db_record = cpu_to_be64(srq->db.dma); | |
01949d01 | 305 | err = mlx5_core_create_srq(dev->mdev, &srq->msrq, in, inlen, is_xrc); |
479163f4 | 306 | kvfree(in); |
e126ba97 EC |
307 | if (err) { |
308 | mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err); | |
56e1ab0f | 309 | goto err_usr_kern_srq; |
e126ba97 EC |
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 | ||
328 | err_core: | |
9603b61d | 329 | mlx5_core_destroy_srq(dev->mdev, &srq->msrq); |
56e1ab0f ML |
330 | |
331 | err_usr_kern_srq: | |
e126ba97 EC |
332 | if (pd->uobject) |
333 | destroy_srq_user(pd, srq); | |
334 | else | |
335 | destroy_srq_kernel(dev, srq); | |
336 | ||
337 | err_srq: | |
338 | kfree(srq); | |
339 | ||
340 | return ERR_PTR(err); | |
341 | } | |
342 | ||
343 | int 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 | /* We don't support resizing SRQs yet */ | |
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); | |
9603b61d | 359 | ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1); |
e126ba97 EC |
360 | mutex_unlock(&srq->mutex); |
361 | ||
362 | if (ret) | |
363 | return ret; | |
364 | } | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | int 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_query_srq_mbox_out *out; | |
375 | ||
376 | out = kzalloc(sizeof(*out), GFP_KERNEL); | |
377 | if (!out) | |
378 | return -ENOMEM; | |
379 | ||
9603b61d | 380 | ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out); |
e126ba97 EC |
381 | if (ret) |
382 | goto out_box; | |
383 | ||
384 | srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm); | |
385 | srq_attr->max_wr = srq->msrq.max - 1; | |
386 | srq_attr->max_sge = srq->msrq.max_gs; | |
387 | ||
388 | out_box: | |
389 | kfree(out); | |
390 | return ret; | |
391 | } | |
392 | ||
393 | int 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 | ||
9603b61d | 398 | mlx5_core_destroy_srq(dev->mdev, &msrq->msrq); |
e126ba97 EC |
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 { | |
1faacf82 | 404 | destroy_srq_kernel(dev, msrq); |
e126ba97 EC |
405 | } |
406 | ||
407 | kfree(srq); | |
408 | return 0; | |
409 | } | |
410 | ||
411 | void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index) | |
412 | { | |
413 | struct mlx5_wqe_srq_next_seg *next; | |
414 | ||
415 | /* always called with interrupts disabled. */ | |
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 | ||
425 | int 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 | unsigned long flags; | |
432 | int err = 0; | |
433 | int nreq; | |
434 | int i; | |
435 | ||
436 | spin_lock_irqsave(&srq->lock, flags); | |
437 | ||
438 | for (nreq = 0; wr; nreq++, wr = wr->next) { | |
439 | if (unlikely(wr->num_sge > srq->msrq.max_gs)) { | |
440 | err = -EINVAL; | |
441 | *bad_wr = wr; | |
442 | break; | |
443 | } | |
444 | ||
445 | if (unlikely(srq->head == srq->tail)) { | |
446 | err = -ENOMEM; | |
447 | *bad_wr = wr; | |
448 | break; | |
449 | } | |
450 | ||
451 | srq->wrid[srq->head] = wr->wr_id; | |
452 | ||
453 | next = get_wqe(srq, srq->head); | |
454 | srq->head = be16_to_cpu(next->next_wqe_index); | |
455 | scat = (struct mlx5_wqe_data_seg *)(next + 1); | |
456 | ||
457 | for (i = 0; i < wr->num_sge; i++) { | |
458 | scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); | |
459 | scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); | |
460 | scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); | |
461 | } | |
462 | ||
463 | if (i < srq->msrq.max_avail_gather) { | |
464 | scat[i].byte_count = 0; | |
465 | scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY); | |
466 | scat[i].addr = 0; | |
467 | } | |
468 | } | |
469 | ||
470 | if (likely(nreq)) { | |
471 | srq->wqe_ctr += nreq; | |
472 | ||
473 | /* Make sure that descriptors are written before | |
474 | * doorbell record. | |
475 | */ | |
476 | wmb(); | |
477 | ||
478 | *srq->db.db = cpu_to_be32(srq->wqe_ctr); | |
479 | } | |
480 | ||
481 | spin_unlock_irqrestore(&srq->lock, flags); | |
482 | ||
483 | return err; | |
484 | } |