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
 13static void *get_wqe(struct mlx5_ib_srq *srq, int n)
 14{
 15	return mlx5_frag_buf_get_wqe(&srq->fbc, n);
 16}
 17
 18static 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
 43static 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
 99err_umem:
100	ib_umem_release(srq->umem);
101
102	return err;
103}
104
105static 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
160err_in:
161	kvfree(in->pas);
162
163err_buf:
164	mlx5_frag_buf_free(dev->mdev, &srq->buf);
165
166err_db:
167	mlx5_db_free(dev->mdev, &srq->db);
168	return err;
169}
170
171static 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
184static 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
191int 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
316err_core:
317	mlx5_cmd_destroy_srq(dev, &srq->msrq);
318
319err_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
328int 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
354int 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
373out_box:
374	kfree(out);
375	return ret;
376}
377
378int 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
395void 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
409int 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	}
472out:
473	spin_unlock_irqrestore(&srq->lock, flags);
474
475	return err;
476}