1 /*
2 * Copyright (c) 2007 Cisco Systems, 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/mlx4/qp.h>
34 #include <linux/mlx4/srq.h>
35
36 #include "mlx4_ib.h"
37 #include "user.h"
38
39 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
40 {
41 return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
42 }
43
44 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
45 {
46 struct ib_event event;
47 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
48
49 if (ibsrq->event_handler) {
50 event.device = ibsrq->device;
51 event.element.srq = ibsrq;
52 switch (type) {
53 case MLX4_EVENT_TYPE_SRQ_LIMIT:
54 event.event = IB_EVENT_SRQ_LIMIT_REACHED;
55 break;
56 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
57 event.event = IB_EVENT_SRQ_ERR;
58 break;
59 default:
60 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
61 "on SRQ %06x\n", type, srq->srqn);
62 return;
63 }
64
65 ibsrq->event_handler(&event, ibsrq->srq_context);
66 }
67 }
68
69 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
70 struct ib_srq_init_attr *init_attr,
71 struct ib_udata *udata)
72 {
73 struct mlx4_ib_dev *dev = to_mdev(pd->device);
74 struct mlx4_ib_srq *srq;
75 struct mlx4_wqe_srq_next_seg *next;
76 int desc_size;
77 int buf_size;
78 int err;
79 int i;
80
81 /* Sanity check SRQ size before proceeding */
82 if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes ||
83 init_attr->attr.max_sge > dev->dev->caps.max_srq_sge)
84 return ERR_PTR(-EINVAL);
85
86 srq = kmalloc(sizeof *srq, GFP_KERNEL);
87 if (!srq)
88 return ERR_PTR(-ENOMEM);
89
90 mutex_init(&srq->mutex);
91 spin_lock_init(&srq->lock);
92 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
93 srq->msrq.max_gs = init_attr->attr.max_sge;
94
95 desc_size = max(32UL,
96 roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
97 srq->msrq.max_gs *
98 sizeof (struct mlx4_wqe_data_seg)));
99 srq->msrq.wqe_shift = ilog2(desc_size);
100
101 buf_size = srq->msrq.max * desc_size;
102
103 if (pd->uobject) {
104 struct mlx4_ib_create_srq ucmd;
105
106 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
107 err = -EFAULT;
108 goto err_srq;
109 }
110
111 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
112 buf_size, 0);
113 if (IS_ERR(srq->umem)) {
114 err = PTR_ERR(srq->umem);
115 goto err_srq;
116 }
117
118 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
119 ilog2(srq->umem->page_size), &srq->mtt);
120 if (err)
121 goto err_buf;
122
123 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
124 if (err)
125 goto err_mtt;
126
127 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
128 ucmd.db_addr, &srq->db);
129 if (err)
130 goto err_mtt;
131 } else {
132 err = mlx4_ib_db_alloc(dev, &srq->db, 0);
133 if (err)
134 goto err_srq;
135
136 *srq->db.db = 0;
137
138 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
139 err = -ENOMEM;
140 goto err_db;
141 }
142
143 srq->head = 0;
144 srq->tail = srq->msrq.max - 1;
145 srq->wqe_ctr = 0;
146
147 for (i = 0; i < srq->msrq.max; ++i) {
148 next = get_wqe(srq, i);
149 next->next_wqe_index =
150 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
151 }
152
153 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
154 &srq->mtt);
155 if (err)
156 goto err_buf;
157
158 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
159 if (err)
160 goto err_mtt;
161
162 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
163 if (!srq->wrid) {
164 err = -ENOMEM;
165 goto err_mtt;
166 }
167 }
168
169 err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
170 srq->db.dma, &srq->msrq);
171 if (err)
172 goto err_wrid;
173
174 srq->msrq.event = mlx4_ib_srq_event;
175
176 if (pd->uobject)
177 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
178 err = -EFAULT;
179 goto err_wrid;
180 }
181
182 init_attr->attr.max_wr = srq->msrq.max - 1;
183
184 return &srq->ibsrq;
185
186 err_wrid:
187 if (pd->uobject)
188 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
189 else
190 kfree(srq->wrid);
191
192 err_mtt:
193 mlx4_mtt_cleanup(dev->dev, &srq->mtt);
194
195 err_buf:
196 if (pd->uobject)
197 ib_umem_release(srq->umem);
198 else
199 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
200
201 err_db:
202 if (!pd->uobject)
203 mlx4_ib_db_free(dev, &srq->db);
204
205 err_srq:
206 kfree(srq);
207
208 return ERR_PTR(err);
209 }
210
211 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
212 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
213 {
214 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
215 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
216 int ret;
217
218 /* We don't support resizing SRQs (yet?) */
219 if (attr_mask & IB_SRQ_MAX_WR)
220 return -EINVAL;
221
222 if (attr_mask & IB_SRQ_LIMIT) {
223 if (attr->srq_limit >= srq->msrq.max)
224 return -EINVAL;
225
226 mutex_lock(&srq->mutex);
227 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
228 mutex_unlock(&srq->mutex);
229
230 if (ret)
231 return ret;
232 }
233
234 return 0;
235 }
236
237 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
238 {
239 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
240 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
241 int ret;
242 int limit_watermark;
243
244 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
245 if (ret)
246 return ret;
247
248 srq_attr->srq_limit = limit_watermark;
249 srq_attr->max_wr = srq->msrq.max - 1;
250 srq_attr->max_sge = srq->msrq.max_gs;
251
252 return 0;
253 }
254
255 int mlx4_ib_destroy_srq(struct ib_srq *srq)
256 {
257 struct mlx4_ib_dev *dev = to_mdev(srq->device);
258 struct mlx4_ib_srq *msrq = to_msrq(srq);
259
260 mlx4_srq_free(dev->dev, &msrq->msrq);
261 mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
262
263 if (srq->uobject) {
264 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
265 ib_umem_release(msrq->umem);
266 } else {
267 kfree(msrq->wrid);
268 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
269 &msrq->buf);
270 mlx4_ib_db_free(dev, &msrq->db);
271 }
272
273 kfree(msrq);
274
275 return 0;
276 }
277
278 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
279 {
280 struct mlx4_wqe_srq_next_seg *next;
281
282 /* always called with interrupts disabled. */
283 spin_lock(&srq->lock);
284
285 next = get_wqe(srq, srq->tail);
286 next->next_wqe_index = cpu_to_be16(wqe_index);
287 srq->tail = wqe_index;
288
289 spin_unlock(&srq->lock);
290 }
291
292 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
293 struct ib_recv_wr **bad_wr)
294 {
295 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
296 struct mlx4_wqe_srq_next_seg *next;
297 struct mlx4_wqe_data_seg *scat;
298 unsigned long flags;
299 int err = 0;
300 int nreq;
301 int i;
302
303 spin_lock_irqsave(&srq->lock, flags);
304
305 for (nreq = 0; wr; ++nreq, wr = wr->next) {
306 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
307 err = -EINVAL;
308 *bad_wr = wr;
309 break;
310 }
311
312 if (unlikely(srq->head == srq->tail)) {
313 err = -ENOMEM;
314 *bad_wr = wr;
315 break;
316 }
317
318 srq->wrid[srq->head] = wr->wr_id;
319
320 next = get_wqe(srq, srq->head);
321 srq->head = be16_to_cpu(next->next_wqe_index);
322 scat = (struct mlx4_wqe_data_seg *) (next + 1);
323
324 for (i = 0; i < wr->num_sge; ++i) {
325 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
326 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
327 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
328 }
329
330 if (i < srq->msrq.max_gs) {
331 scat[i].byte_count = 0;
332 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
333 scat[i].addr = 0;
334 }
335 }
336
337 if (likely(nreq)) {
338 srq->wqe_ctr += nreq;
339
340 /*
341 * Make sure that descriptors are written before
342 * doorbell record.
343 */
344 wmb();
345
346 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
347 }
348
349 spin_unlock_irqrestore(&srq->lock, flags);
350
351 return err;
352 }
353
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