]> Git Repo - J-linux.git/blob - drivers/infiniband/hw/mlx5/srq.c
Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / drivers / infiniband / hw / mlx5 / srq.c
1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3  * Copyright (c) 2013-2018, Mellanox Technologies inc.  All rights reserved.
4  */
5
6 #include <linux/mlx5/qp.h>
7 #include <linux/slab.h>
8 #include <rdma/ib_umem.h>
9 #include <rdma/ib_user_verbs.h>
10 #include "mlx5_ib.h"
11 #include "srq.h"
12
13 static void *get_wqe(struct mlx5_ib_srq *srq, int n)
14 {
15         return mlx5_frag_buf_get_wqe(&srq->fbc, n);
16 }
17
18 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type)
19 {
20         struct ib_event event;
21         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
22
23         if (ibsrq->event_handler) {
24                 event.device      = ibsrq->device;
25                 event.element.srq = ibsrq;
26                 switch (type) {
27                 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
28                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
29                         break;
30                 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
31                         event.event = IB_EVENT_SRQ_ERR;
32                         break;
33                 default:
34                         pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
35                                 type, srq->srqn);
36                         return;
37                 }
38
39                 ibsrq->event_handler(&event, ibsrq->srq_context);
40         }
41 }
42
43 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
44                            struct mlx5_srq_attr *in,
45                            struct ib_udata *udata, int buf_size)
46 {
47         struct mlx5_ib_dev *dev = to_mdev(pd->device);
48         struct mlx5_ib_create_srq ucmd = {};
49         struct mlx5_ib_ucontext *ucontext = rdma_udata_to_drv_context(
50                 udata, struct mlx5_ib_ucontext, ibucontext);
51         size_t ucmdlen;
52         int err;
53         u32 uidx = MLX5_IB_DEFAULT_UIDX;
54
55         ucmdlen = min(udata->inlen, sizeof(ucmd));
56
57         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
58                 mlx5_ib_dbg(dev, "failed copy udata\n");
59                 return -EFAULT;
60         }
61
62         if (ucmd.reserved0 || ucmd.reserved1)
63                 return -EINVAL;
64
65         if (udata->inlen > sizeof(ucmd) &&
66             !ib_is_udata_cleared(udata, sizeof(ucmd),
67                                  udata->inlen - sizeof(ucmd)))
68                 return -EINVAL;
69
70         if (in->type != IB_SRQT_BASIC) {
71                 err = get_srq_user_index(ucontext, &ucmd, udata->inlen, &uidx);
72                 if (err)
73                         return err;
74         }
75
76         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
77
78         srq->umem = ib_umem_get(pd->device, ucmd.buf_addr, buf_size, 0);
79         if (IS_ERR(srq->umem)) {
80                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
81                 err = PTR_ERR(srq->umem);
82                 return err;
83         }
84         in->umem = srq->umem;
85
86         err = mlx5_ib_db_map_user(ucontext, ucmd.db_addr, &srq->db);
87         if (err) {
88                 mlx5_ib_dbg(dev, "map doorbell failed\n");
89                 goto err_umem;
90         }
91
92         in->uid = (in->type != IB_SRQT_XRC) ?  to_mpd(pd)->uid : 0;
93         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
94             in->type != IB_SRQT_BASIC)
95                 in->user_index = uidx;
96
97         return 0;
98
99 err_umem:
100         ib_umem_release(srq->umem);
101
102         return err;
103 }
104
105 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
106                              struct mlx5_srq_attr *in, int buf_size)
107 {
108         int err;
109         int i;
110         struct mlx5_wqe_srq_next_seg *next;
111
112         err = mlx5_db_alloc(dev->mdev, &srq->db);
113         if (err) {
114                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
115                 return err;
116         }
117
118         if (mlx5_frag_buf_alloc_node(dev->mdev, buf_size, &srq->buf,
119                                      dev->mdev->priv.numa_node)) {
120                 mlx5_ib_dbg(dev, "buf alloc failed\n");
121                 err = -ENOMEM;
122                 goto err_db;
123         }
124
125         mlx5_init_fbc(srq->buf.frags, srq->msrq.wqe_shift, ilog2(srq->msrq.max),
126                       &srq->fbc);
127
128         srq->head    = 0;
129         srq->tail    = srq->msrq.max - 1;
130         srq->wqe_ctr = 0;
131
132         for (i = 0; i < srq->msrq.max; i++) {
133                 next = get_wqe(srq, i);
134                 next->next_wqe_index =
135                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
136         }
137
138         mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
139         in->pas = kvcalloc(srq->buf.npages, sizeof(*in->pas), GFP_KERNEL);
140         if (!in->pas) {
141                 err = -ENOMEM;
142                 goto err_buf;
143         }
144         mlx5_fill_page_frag_array(&srq->buf, in->pas);
145
146         srq->wrid = kvmalloc_array(srq->msrq.max, sizeof(u64), GFP_KERNEL);
147         if (!srq->wrid) {
148                 err = -ENOMEM;
149                 goto err_in;
150         }
151         srq->wq_sig = 0;
152
153         in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
154         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
155             in->type != IB_SRQT_BASIC)
156                 in->user_index = MLX5_IB_DEFAULT_UIDX;
157
158         return 0;
159
160 err_in:
161         kvfree(in->pas);
162
163 err_buf:
164         mlx5_frag_buf_free(dev->mdev, &srq->buf);
165
166 err_db:
167         mlx5_db_free(dev->mdev, &srq->db);
168         return err;
169 }
170
171 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
172                              struct ib_udata *udata)
173 {
174         mlx5_ib_db_unmap_user(
175                 rdma_udata_to_drv_context(
176                         udata,
177                         struct mlx5_ib_ucontext,
178                         ibucontext),
179                 &srq->db);
180         ib_umem_release(srq->umem);
181 }
182
183
184 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
185 {
186         kvfree(srq->wrid);
187         mlx5_frag_buf_free(dev->mdev, &srq->buf);
188         mlx5_db_free(dev->mdev, &srq->db);
189 }
190
191 int mlx5_ib_create_srq(struct ib_srq *ib_srq,
192                        struct ib_srq_init_attr *init_attr,
193                        struct ib_udata *udata)
194 {
195         struct mlx5_ib_dev *dev = to_mdev(ib_srq->device);
196         struct mlx5_ib_srq *srq = to_msrq(ib_srq);
197         size_t desc_size;
198         size_t buf_size;
199         int err;
200         struct mlx5_srq_attr in = {};
201         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
202         __u32 max_sge_sz =  MLX5_CAP_GEN(dev->mdev, max_wqe_sz_rq) /
203                             sizeof(struct mlx5_wqe_data_seg);
204
205         if (init_attr->srq_type != IB_SRQT_BASIC &&
206             init_attr->srq_type != IB_SRQT_XRC &&
207             init_attr->srq_type != IB_SRQT_TM)
208                 return -EOPNOTSUPP;
209
210         /* Sanity check SRQ and sge size before proceeding */
211         if (init_attr->attr.max_wr >= max_srq_wqes ||
212             init_attr->attr.max_sge > max_sge_sz) {
213                 mlx5_ib_dbg(dev, "max_wr %d,wr_cap %d,max_sge %d, sge_cap:%d\n",
214                             init_attr->attr.max_wr, max_srq_wqes,
215                             init_attr->attr.max_sge, max_sge_sz);
216                 return -EINVAL;
217         }
218
219         err = mlx5_ib_dev_res_cq_init(dev);
220         if (err)
221                 return err;
222
223         mutex_init(&srq->mutex);
224         spin_lock_init(&srq->lock);
225         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
226         srq->msrq.max_gs = init_attr->attr.max_sge;
227
228         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
229                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
230         if (desc_size == 0 || srq->msrq.max_gs > desc_size)
231                 return -EINVAL;
232
233         desc_size = roundup_pow_of_two(desc_size);
234         desc_size = max_t(size_t, 32, desc_size);
235         if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg))
236                 return -EINVAL;
237
238         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
239                 sizeof(struct mlx5_wqe_data_seg);
240         srq->msrq.wqe_shift = ilog2(desc_size);
241         buf_size = srq->msrq.max * desc_size;
242         if (buf_size < desc_size)
243                 return -EINVAL;
244
245         in.type = init_attr->srq_type;
246
247         if (udata)
248                 err = create_srq_user(ib_srq->pd, srq, &in, udata, buf_size);
249         else
250                 err = create_srq_kernel(dev, srq, &in, buf_size);
251
252         if (err) {
253                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
254                              udata ? "user" : "kernel", err);
255                 return err;
256         }
257
258         in.log_size = ilog2(srq->msrq.max);
259         in.wqe_shift = srq->msrq.wqe_shift - 4;
260         if (srq->wq_sig)
261                 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
262
263         if (init_attr->srq_type == IB_SRQT_XRC && init_attr->ext.xrc.xrcd)
264                 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
265         else
266                 in.xrcd = dev->devr.xrcdn0;
267
268         if (init_attr->srq_type == IB_SRQT_TM) {
269                 in.tm_log_list_size =
270                         ilog2(init_attr->ext.tag_matching.max_num_tags) + 1;
271                 if (in.tm_log_list_size >
272                     MLX5_CAP_GEN(dev->mdev, log_tag_matching_list_sz)) {
273                         mlx5_ib_dbg(dev, "TM SRQ max_num_tags exceeding limit\n");
274                         err = -EINVAL;
275                         goto err_usr_kern_srq;
276                 }
277                 in.flags |= MLX5_SRQ_FLAG_RNDV;
278         }
279
280         if (ib_srq_has_cq(init_attr->srq_type))
281                 in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn;
282         else
283                 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
284
285         in.pd = to_mpd(ib_srq->pd)->pdn;
286         in.db_record = srq->db.dma;
287         err = mlx5_cmd_create_srq(dev, &srq->msrq, &in);
288         kvfree(in.pas);
289         if (err) {
290                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
291                 goto err_usr_kern_srq;
292         }
293
294         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
295
296         srq->msrq.event = mlx5_ib_srq_event;
297         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
298
299         if (udata) {
300                 struct mlx5_ib_create_srq_resp resp = {
301                         .srqn = srq->msrq.srqn,
302                 };
303
304                 if (ib_copy_to_udata(udata, &resp, min(udata->outlen,
305                                      sizeof(resp)))) {
306                         mlx5_ib_dbg(dev, "copy to user failed\n");
307                         err = -EFAULT;
308                         goto err_core;
309                 }
310         }
311
312         init_attr->attr.max_wr = srq->msrq.max - 1;
313
314         return 0;
315
316 err_core:
317         mlx5_cmd_destroy_srq(dev, &srq->msrq);
318
319 err_usr_kern_srq:
320         if (udata)
321                 destroy_srq_user(ib_srq->pd, srq, udata);
322         else
323                 destroy_srq_kernel(dev, srq);
324
325         return err;
326 }
327
328 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
329                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
330 {
331         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
332         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
333         int ret;
334
335         /* We don't support resizing SRQs yet */
336         if (attr_mask & IB_SRQ_MAX_WR)
337                 return -EINVAL;
338
339         if (attr_mask & IB_SRQ_LIMIT) {
340                 if (attr->srq_limit >= srq->msrq.max)
341                         return -EINVAL;
342
343                 mutex_lock(&srq->mutex);
344                 ret = mlx5_cmd_arm_srq(dev, &srq->msrq, attr->srq_limit, 1);
345                 mutex_unlock(&srq->mutex);
346
347                 if (ret)
348                         return ret;
349         }
350
351         return 0;
352 }
353
354 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
355 {
356         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
357         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
358         int ret;
359         struct mlx5_srq_attr *out;
360
361         out = kzalloc(sizeof(*out), GFP_KERNEL);
362         if (!out)
363                 return -ENOMEM;
364
365         ret = mlx5_cmd_query_srq(dev, &srq->msrq, out);
366         if (ret)
367                 goto out_box;
368
369         srq_attr->srq_limit = out->lwm;
370         srq_attr->max_wr    = srq->msrq.max - 1;
371         srq_attr->max_sge   = srq->msrq.max_gs;
372
373 out_box:
374         kfree(out);
375         return ret;
376 }
377
378 int mlx5_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
379 {
380         struct mlx5_ib_dev *dev = to_mdev(srq->device);
381         struct mlx5_ib_srq *msrq = to_msrq(srq);
382         int ret;
383
384         ret = mlx5_cmd_destroy_srq(dev, &msrq->msrq);
385         if (ret)
386                 return ret;
387
388         if (udata)
389                 destroy_srq_user(srq->pd, msrq, udata);
390         else
391                 destroy_srq_kernel(dev, msrq);
392         return 0;
393 }
394
395 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
396 {
397         struct mlx5_wqe_srq_next_seg *next;
398
399         /* always called with interrupts disabled. */
400         spin_lock(&srq->lock);
401
402         next = get_wqe(srq, srq->tail);
403         next->next_wqe_index = cpu_to_be16(wqe_index);
404         srq->tail = wqe_index;
405
406         spin_unlock(&srq->lock);
407 }
408
409 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
410                           const struct ib_recv_wr **bad_wr)
411 {
412         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
413         struct mlx5_wqe_srq_next_seg *next;
414         struct mlx5_wqe_data_seg *scat;
415         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
416         struct mlx5_core_dev *mdev = dev->mdev;
417         unsigned long flags;
418         int err = 0;
419         int nreq;
420         int i;
421
422         spin_lock_irqsave(&srq->lock, flags);
423
424         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
425                 err = -EIO;
426                 *bad_wr = wr;
427                 goto out;
428         }
429
430         for (nreq = 0; wr; nreq++, wr = wr->next) {
431                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
432                         err = -EINVAL;
433                         *bad_wr = wr;
434                         break;
435                 }
436
437                 if (unlikely(srq->head == srq->tail)) {
438                         err = -ENOMEM;
439                         *bad_wr = wr;
440                         break;
441                 }
442
443                 srq->wrid[srq->head] = wr->wr_id;
444
445                 next      = get_wqe(srq, srq->head);
446                 srq->head = be16_to_cpu(next->next_wqe_index);
447                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
448
449                 for (i = 0; i < wr->num_sge; i++) {
450                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
451                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
452                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
453                 }
454
455                 if (i < srq->msrq.max_avail_gather) {
456                         scat[i].byte_count = 0;
457                         scat[i].lkey = dev->mkeys.terminate_scatter_list_mkey;
458                         scat[i].addr       = 0;
459                 }
460         }
461
462         if (likely(nreq)) {
463                 srq->wqe_ctr += nreq;
464
465                 /* Make sure that descriptors are written before
466                  * doorbell record.
467                  */
468                 wmb();
469
470                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
471         }
472 out:
473         spin_unlock_irqrestore(&srq->lock, flags);
474
475         return err;
476 }
This page took 0.059734 seconds and 4 git commands to generate.