1 /*
2 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. 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/err.h>
35 #include <linux/slab.h>
36 #include <linux/vmalloc.h>
37
38 #include "qib_verbs.h"
39
40 /**
41 * qib_post_srq_receive - post a receive on a shared receive queue
42 * @ibsrq: the SRQ to post the receive on
43 * @wr: the list of work requests to post
44 * @bad_wr: A pointer to the first WR to cause a problem is put here
45 *
46 * This may be called from interrupt context.
47 */
qib_post_srq_receive(struct ib_srq * ibsrq,struct ib_recv_wr * wr,struct ib_recv_wr ** bad_wr)48 int qib_post_srq_receive(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
49 struct ib_recv_wr **bad_wr)
50 {
51 struct qib_srq *srq = to_isrq(ibsrq);
52 struct qib_rwq *wq;
53 unsigned long flags;
54 int ret;
55
56 for (; wr; wr = wr->next) {
57 struct qib_rwqe *wqe;
58 u32 next;
59 int i;
60
61 if ((unsigned) wr->num_sge > srq->rq.max_sge) {
62 *bad_wr = wr;
63 ret = -EINVAL;
64 goto bail;
65 }
66
67 spin_lock_irqsave(&srq->rq.lock, flags);
68 wq = srq->rq.wq;
69 next = wq->head + 1;
70 if (next >= srq->rq.size)
71 next = 0;
72 if (next == wq->tail) {
73 spin_unlock_irqrestore(&srq->rq.lock, flags);
74 *bad_wr = wr;
75 ret = -ENOMEM;
76 goto bail;
77 }
78
79 wqe = get_rwqe_ptr(&srq->rq, wq->head);
80 wqe->wr_id = wr->wr_id;
81 wqe->num_sge = wr->num_sge;
82 for (i = 0; i < wr->num_sge; i++)
83 wqe->sg_list[i] = wr->sg_list[i];
84 /* Make sure queue entry is written before the head index. */
85 smp_wmb();
86 wq->head = next;
87 spin_unlock_irqrestore(&srq->rq.lock, flags);
88 }
89 ret = 0;
90
91 bail:
92 return ret;
93 }
94
95 /**
96 * qib_create_srq - create a shared receive queue
97 * @ibpd: the protection domain of the SRQ to create
98 * @srq_init_attr: the attributes of the SRQ
99 * @udata: data from libibverbs when creating a user SRQ
100 */
qib_create_srq(struct ib_pd * ibpd,struct ib_srq_init_attr * srq_init_attr,struct ib_udata * udata)101 struct ib_srq *qib_create_srq(struct ib_pd *ibpd,
102 struct ib_srq_init_attr *srq_init_attr,
103 struct ib_udata *udata)
104 {
105 struct qib_ibdev *dev = to_idev(ibpd->device);
106 struct qib_srq *srq;
107 u32 sz;
108 struct ib_srq *ret;
109
110 if (srq_init_attr->srq_type != IB_SRQT_BASIC) {
111 ret = ERR_PTR(-ENOSYS);
112 goto done;
113 }
114
115 if (srq_init_attr->attr.max_sge == 0 ||
116 srq_init_attr->attr.max_sge > ib_qib_max_srq_sges ||
117 srq_init_attr->attr.max_wr == 0 ||
118 srq_init_attr->attr.max_wr > ib_qib_max_srq_wrs) {
119 ret = ERR_PTR(-EINVAL);
120 goto done;
121 }
122
123 srq = kmalloc(sizeof(*srq), GFP_KERNEL);
124 if (!srq) {
125 ret = ERR_PTR(-ENOMEM);
126 goto done;
127 }
128
129 /*
130 * Need to use vmalloc() if we want to support large #s of entries.
131 */
132 srq->rq.size = srq_init_attr->attr.max_wr + 1;
133 srq->rq.max_sge = srq_init_attr->attr.max_sge;
134 sz = sizeof(struct ib_sge) * srq->rq.max_sge +
135 sizeof(struct qib_rwqe);
136 srq->rq.wq = vmalloc_user(sizeof(struct qib_rwq) + srq->rq.size * sz);
137 if (!srq->rq.wq) {
138 ret = ERR_PTR(-ENOMEM);
139 goto bail_srq;
140 }
141
142 /*
143 * Return the address of the RWQ as the offset to mmap.
144 * See qib_mmap() for details.
145 */
146 if (udata && udata->outlen >= sizeof(__u64)) {
147 int err;
148 u32 s = sizeof(struct qib_rwq) + srq->rq.size * sz;
149
150 srq->ip =
151 qib_create_mmap_info(dev, s, ibpd->uobject->context,
152 srq->rq.wq);
153 if (!srq->ip) {
154 ret = ERR_PTR(-ENOMEM);
155 goto bail_wq;
156 }
157
158 err = ib_copy_to_udata(udata, &srq->ip->offset,
159 sizeof(srq->ip->offset));
160 if (err) {
161 ret = ERR_PTR(err);
162 goto bail_ip;
163 }
164 } else
165 srq->ip = NULL;
166
167 /*
168 * ib_create_srq() will initialize srq->ibsrq.
169 */
170 spin_lock_init(&srq->rq.lock);
171 srq->rq.wq->head = 0;
172 srq->rq.wq->tail = 0;
173 srq->limit = srq_init_attr->attr.srq_limit;
174
175 spin_lock(&dev->n_srqs_lock);
176 if (dev->n_srqs_allocated == ib_qib_max_srqs) {
177 spin_unlock(&dev->n_srqs_lock);
178 ret = ERR_PTR(-ENOMEM);
179 goto bail_ip;
180 }
181
182 dev->n_srqs_allocated++;
183 spin_unlock(&dev->n_srqs_lock);
184
185 if (srq->ip) {
186 spin_lock_irq(&dev->pending_lock);
187 list_add(&srq->ip->pending_mmaps, &dev->pending_mmaps);
188 spin_unlock_irq(&dev->pending_lock);
189 }
190
191 ret = &srq->ibsrq;
192 goto done;
193
194 bail_ip:
195 kfree(srq->ip);
196 bail_wq:
197 vfree(srq->rq.wq);
198 bail_srq:
199 kfree(srq);
200 done:
201 return ret;
202 }
203
204 /**
205 * qib_modify_srq - modify a shared receive queue
206 * @ibsrq: the SRQ to modify
207 * @attr: the new attributes of the SRQ
208 * @attr_mask: indicates which attributes to modify
209 * @udata: user data for libibverbs.so
210 */
qib_modify_srq(struct ib_srq * ibsrq,struct ib_srq_attr * attr,enum ib_srq_attr_mask attr_mask,struct ib_udata * udata)211 int qib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
212 enum ib_srq_attr_mask attr_mask,
213 struct ib_udata *udata)
214 {
215 struct qib_srq *srq = to_isrq(ibsrq);
216 struct qib_rwq *wq;
217 int ret = 0;
218
219 if (attr_mask & IB_SRQ_MAX_WR) {
220 struct qib_rwq *owq;
221 struct qib_rwqe *p;
222 u32 sz, size, n, head, tail;
223
224 /* Check that the requested sizes are below the limits. */
225 if ((attr->max_wr > ib_qib_max_srq_wrs) ||
226 ((attr_mask & IB_SRQ_LIMIT) ?
227 attr->srq_limit : srq->limit) > attr->max_wr) {
228 ret = -EINVAL;
229 goto bail;
230 }
231
232 sz = sizeof(struct qib_rwqe) +
233 srq->rq.max_sge * sizeof(struct ib_sge);
234 size = attr->max_wr + 1;
235 wq = vmalloc_user(sizeof(struct qib_rwq) + size * sz);
236 if (!wq) {
237 ret = -ENOMEM;
238 goto bail;
239 }
240
241 /* Check that we can write the offset to mmap. */
242 if (udata && udata->inlen >= sizeof(__u64)) {
243 __u64 offset_addr;
244 __u64 offset = 0;
245
246 ret = ib_copy_from_udata(&offset_addr, udata,
247 sizeof(offset_addr));
248 if (ret)
249 goto bail_free;
250 udata->outbuf =
251 (void __user *) (unsigned long) offset_addr;
252 ret = ib_copy_to_udata(udata, &offset,
253 sizeof(offset));
254 if (ret)
255 goto bail_free;
256 }
257
258 spin_lock_irq(&srq->rq.lock);
259 /*
260 * validate head and tail pointer values and compute
261 * the number of remaining WQEs.
262 */
263 owq = srq->rq.wq;
264 head = owq->head;
265 tail = owq->tail;
266 if (head >= srq->rq.size || tail >= srq->rq.size) {
267 ret = -EINVAL;
268 goto bail_unlock;
269 }
270 n = head;
271 if (n < tail)
272 n += srq->rq.size - tail;
273 else
274 n -= tail;
275 if (size <= n) {
276 ret = -EINVAL;
277 goto bail_unlock;
278 }
279 n = 0;
280 p = wq->wq;
281 while (tail != head) {
282 struct qib_rwqe *wqe;
283 int i;
284
285 wqe = get_rwqe_ptr(&srq->rq, tail);
286 p->wr_id = wqe->wr_id;
287 p->num_sge = wqe->num_sge;
288 for (i = 0; i < wqe->num_sge; i++)
289 p->sg_list[i] = wqe->sg_list[i];
290 n++;
291 p = (struct qib_rwqe *)((char *) p + sz);
292 if (++tail >= srq->rq.size)
293 tail = 0;
294 }
295 srq->rq.wq = wq;
296 srq->rq.size = size;
297 wq->head = n;
298 wq->tail = 0;
299 if (attr_mask & IB_SRQ_LIMIT)
300 srq->limit = attr->srq_limit;
301 spin_unlock_irq(&srq->rq.lock);
302
303 vfree(owq);
304
305 if (srq->ip) {
306 struct qib_mmap_info *ip = srq->ip;
307 struct qib_ibdev *dev = to_idev(srq->ibsrq.device);
308 u32 s = sizeof(struct qib_rwq) + size * sz;
309
310 qib_update_mmap_info(dev, ip, s, wq);
311
312 /*
313 * Return the offset to mmap.
314 * See qib_mmap() for details.
315 */
316 if (udata && udata->inlen >= sizeof(__u64)) {
317 ret = ib_copy_to_udata(udata, &ip->offset,
318 sizeof(ip->offset));
319 if (ret)
320 goto bail;
321 }
322
323 /*
324 * Put user mapping info onto the pending list
325 * unless it already is on the list.
326 */
327 spin_lock_irq(&dev->pending_lock);
328 if (list_empty(&ip->pending_mmaps))
329 list_add(&ip->pending_mmaps,
330 &dev->pending_mmaps);
331 spin_unlock_irq(&dev->pending_lock);
332 }
333 } else if (attr_mask & IB_SRQ_LIMIT) {
334 spin_lock_irq(&srq->rq.lock);
335 if (attr->srq_limit >= srq->rq.size)
336 ret = -EINVAL;
337 else
338 srq->limit = attr->srq_limit;
339 spin_unlock_irq(&srq->rq.lock);
340 }
341 goto bail;
342
343 bail_unlock:
344 spin_unlock_irq(&srq->rq.lock);
345 bail_free:
346 vfree(wq);
347 bail:
348 return ret;
349 }
350
qib_query_srq(struct ib_srq * ibsrq,struct ib_srq_attr * attr)351 int qib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
352 {
353 struct qib_srq *srq = to_isrq(ibsrq);
354
355 attr->max_wr = srq->rq.size - 1;
356 attr->max_sge = srq->rq.max_sge;
357 attr->srq_limit = srq->limit;
358 return 0;
359 }
360
361 /**
362 * qib_destroy_srq - destroy a shared receive queue
363 * @ibsrq: the SRQ to destroy
364 */
qib_destroy_srq(struct ib_srq * ibsrq)365 int qib_destroy_srq(struct ib_srq *ibsrq)
366 {
367 struct qib_srq *srq = to_isrq(ibsrq);
368 struct qib_ibdev *dev = to_idev(ibsrq->device);
369
370 spin_lock(&dev->n_srqs_lock);
371 dev->n_srqs_allocated--;
372 spin_unlock(&dev->n_srqs_lock);
373 if (srq->ip)
374 kref_put(&srq->ip->ref, qib_release_mmap_info);
375 else
376 vfree(srq->rq.wq);
377 kfree(srq);
378
379 return 0;
380 }
381