RDMA/core: Add SRQ type field
[linux-3.10.git] / drivers / infiniband / hw / qib / qib_srq.c
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  */
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  */
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  */
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
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  */
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 }