1 /*
2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include <linux/mlx4/qp.h>
35 #include <linux/mlx4/srq.h>
36 #include <linux/slab.h>
37
38 #include "mlx4_ib.h"
39 #include <rdma/mlx4-abi.h>
40 #include <rdma/uverbs_ioctl.h>
41
get_wqe(struct mlx4_ib_srq * srq,int n)42 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
43 {
44 return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
45 }
46
mlx4_ib_srq_event(struct mlx4_srq * srq,enum mlx4_event type)47 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
48 {
49 struct ib_event event;
50 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
51
52 if (ibsrq->event_handler) {
53 event.device = ibsrq->device;
54 event.element.srq = ibsrq;
55 switch (type) {
56 case MLX4_EVENT_TYPE_SRQ_LIMIT:
57 event.event = IB_EVENT_SRQ_LIMIT_REACHED;
58 break;
59 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
60 event.event = IB_EVENT_SRQ_ERR;
61 break;
62 default:
63 pr_warn("Unexpected event type %d "
64 "on SRQ %06x\n", type, srq->srqn);
65 return;
66 }
67
68 ibsrq->event_handler(&event, ibsrq->srq_context);
69 }
70 }
71
mlx4_ib_create_srq(struct ib_srq * ib_srq,struct ib_srq_init_attr * init_attr,struct ib_udata * udata)72 int mlx4_ib_create_srq(struct ib_srq *ib_srq,
73 struct ib_srq_init_attr *init_attr,
74 struct ib_udata *udata)
75 {
76 struct mlx4_ib_dev *dev = to_mdev(ib_srq->device);
77 struct mlx4_ib_ucontext *ucontext = rdma_udata_to_drv_context(
78 udata, struct mlx4_ib_ucontext, ibucontext);
79 struct mlx4_ib_srq *srq = to_msrq(ib_srq);
80 struct mlx4_wqe_srq_next_seg *next;
81 struct mlx4_wqe_data_seg *scatter;
82 u32 cqn;
83 u16 xrcdn;
84 int desc_size;
85 int buf_size;
86 int err;
87 int i;
88
89 /* Sanity check SRQ size before proceeding */
90 if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes ||
91 init_attr->attr.max_sge > dev->dev->caps.max_srq_sge)
92 return -EINVAL;
93
94 mutex_init(&srq->mutex);
95 spin_lock_init(&srq->lock);
96 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
97 srq->msrq.max_gs = init_attr->attr.max_sge;
98
99 desc_size = max(32UL,
100 roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
101 srq->msrq.max_gs *
102 sizeof (struct mlx4_wqe_data_seg)));
103 srq->msrq.wqe_shift = ilog2(desc_size);
104
105 buf_size = srq->msrq.max * desc_size;
106
107 if (udata) {
108 struct mlx4_ib_create_srq ucmd;
109
110 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd)))
111 return -EFAULT;
112
113 srq->umem =
114 ib_umem_get(ib_srq->device, ucmd.buf_addr, buf_size, 0);
115 if (IS_ERR(srq->umem))
116 return PTR_ERR(srq->umem);
117
118 err = mlx4_mtt_init(
119 dev->dev, ib_umem_num_dma_blocks(srq->umem, PAGE_SIZE),
120 PAGE_SHIFT, &srq->mtt);
121 if (err)
122 goto err_buf;
123
124 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
125 if (err)
126 goto err_mtt;
127
128 err = mlx4_ib_db_map_user(udata, ucmd.db_addr, &srq->db);
129 if (err)
130 goto err_mtt;
131 } else {
132 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
133 if (err)
134 return err;
135
136 *srq->db.db = 0;
137
138 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2,
139 &srq->buf)) {
140 err = -ENOMEM;
141 goto err_db;
142 }
143
144 srq->head = 0;
145 srq->tail = srq->msrq.max - 1;
146 srq->wqe_ctr = 0;
147
148 for (i = 0; i < srq->msrq.max; ++i) {
149 next = get_wqe(srq, i);
150 next->next_wqe_index =
151 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
152
153 for (scatter = (void *) (next + 1);
154 (void *) scatter < (void *) next + desc_size;
155 ++scatter)
156 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
157 }
158
159 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
160 &srq->mtt);
161 if (err)
162 goto err_buf;
163
164 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
165 if (err)
166 goto err_mtt;
167
168 srq->wrid = kvmalloc_array(srq->msrq.max,
169 sizeof(u64), GFP_KERNEL);
170 if (!srq->wrid) {
171 err = -ENOMEM;
172 goto err_mtt;
173 }
174 }
175
176 cqn = ib_srq_has_cq(init_attr->srq_type) ?
177 to_mcq(init_attr->ext.cq)->mcq.cqn : 0;
178 xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
179 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
180 (u16) dev->dev->caps.reserved_xrcds;
181 err = mlx4_srq_alloc(dev->dev, to_mpd(ib_srq->pd)->pdn, cqn, xrcdn,
182 &srq->mtt, srq->db.dma, &srq->msrq);
183 if (err)
184 goto err_wrid;
185
186 srq->msrq.event = mlx4_ib_srq_event;
187 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
188
189 if (udata)
190 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
191 err = -EFAULT;
192 goto err_wrid;
193 }
194
195 init_attr->attr.max_wr = srq->msrq.max - 1;
196
197 return 0;
198
199 err_wrid:
200 if (udata)
201 mlx4_ib_db_unmap_user(ucontext, &srq->db);
202 else
203 kvfree(srq->wrid);
204
205 err_mtt:
206 mlx4_mtt_cleanup(dev->dev, &srq->mtt);
207
208 err_buf:
209 if (!srq->umem)
210 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
211 ib_umem_release(srq->umem);
212
213 err_db:
214 if (!udata)
215 mlx4_db_free(dev->dev, &srq->db);
216
217 return err;
218 }
219
mlx4_ib_modify_srq(struct ib_srq * ibsrq,struct ib_srq_attr * attr,enum ib_srq_attr_mask attr_mask,struct ib_udata * udata)220 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
221 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
222 {
223 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
224 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
225 int ret;
226
227 /* We don't support resizing SRQs (yet?) */
228 if (attr_mask & IB_SRQ_MAX_WR)
229 return -EINVAL;
230
231 if (attr_mask & IB_SRQ_LIMIT) {
232 if (attr->srq_limit >= srq->msrq.max)
233 return -EINVAL;
234
235 mutex_lock(&srq->mutex);
236 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
237 mutex_unlock(&srq->mutex);
238
239 if (ret)
240 return ret;
241 }
242
243 return 0;
244 }
245
mlx4_ib_query_srq(struct ib_srq * ibsrq,struct ib_srq_attr * srq_attr)246 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
247 {
248 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
249 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
250 int ret;
251 int limit_watermark;
252
253 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
254 if (ret)
255 return ret;
256
257 srq_attr->srq_limit = limit_watermark;
258 srq_attr->max_wr = srq->msrq.max - 1;
259 srq_attr->max_sge = srq->msrq.max_gs;
260
261 return 0;
262 }
263
mlx4_ib_destroy_srq(struct ib_srq * srq,struct ib_udata * udata)264 int mlx4_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
265 {
266 struct mlx4_ib_dev *dev = to_mdev(srq->device);
267 struct mlx4_ib_srq *msrq = to_msrq(srq);
268
269 mlx4_srq_free(dev->dev, &msrq->msrq);
270 mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
271
272 if (udata) {
273 mlx4_ib_db_unmap_user(
274 rdma_udata_to_drv_context(
275 udata,
276 struct mlx4_ib_ucontext,
277 ibucontext),
278 &msrq->db);
279 } else {
280 kvfree(msrq->wrid);
281 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
282 &msrq->buf);
283 mlx4_db_free(dev->dev, &msrq->db);
284 }
285 ib_umem_release(msrq->umem);
286 return 0;
287 }
288
mlx4_ib_free_srq_wqe(struct mlx4_ib_srq * srq,int wqe_index)289 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
290 {
291 struct mlx4_wqe_srq_next_seg *next;
292
293 /* always called with interrupts disabled. */
294 spin_lock(&srq->lock);
295
296 next = get_wqe(srq, srq->tail);
297 next->next_wqe_index = cpu_to_be16(wqe_index);
298 srq->tail = wqe_index;
299
300 spin_unlock(&srq->lock);
301 }
302
mlx4_ib_post_srq_recv(struct ib_srq * ibsrq,const struct ib_recv_wr * wr,const struct ib_recv_wr ** bad_wr)303 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
304 const struct ib_recv_wr **bad_wr)
305 {
306 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
307 struct mlx4_wqe_srq_next_seg *next;
308 struct mlx4_wqe_data_seg *scat;
309 unsigned long flags;
310 int err = 0;
311 int nreq;
312 int i;
313 struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device);
314
315 spin_lock_irqsave(&srq->lock, flags);
316 if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
317 err = -EIO;
318 *bad_wr = wr;
319 nreq = 0;
320 goto out;
321 }
322
323 for (nreq = 0; wr; ++nreq, wr = wr->next) {
324 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
325 err = -EINVAL;
326 *bad_wr = wr;
327 break;
328 }
329
330 if (unlikely(srq->head == srq->tail)) {
331 err = -ENOMEM;
332 *bad_wr = wr;
333 break;
334 }
335
336 srq->wrid[srq->head] = wr->wr_id;
337
338 next = get_wqe(srq, srq->head);
339 srq->head = be16_to_cpu(next->next_wqe_index);
340 scat = (struct mlx4_wqe_data_seg *) (next + 1);
341
342 for (i = 0; i < wr->num_sge; ++i) {
343 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
344 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
345 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
346 }
347
348 if (i < srq->msrq.max_gs) {
349 scat[i].byte_count = 0;
350 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
351 scat[i].addr = 0;
352 }
353 }
354
355 if (likely(nreq)) {
356 srq->wqe_ctr += nreq;
357
358 /*
359 * Make sure that descriptors are written before
360 * doorbell record.
361 */
362 wmb();
363
364 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
365 }
366 out:
367
368 spin_unlock_irqrestore(&srq->lock, flags);
369
370 return err;
371 }
372