03acae66ba81a5e0512307f19688c8b18c038b09
[linux-3.10.git] / drivers / infiniband / hw / ipath / ipath_srq.c
1 /*
2  * Copyright (c) 2006 QLogic, Inc. 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/vmalloc.h>
36
37 #include "ipath_verbs.h"
38
39 /**
40  * ipath_post_srq_receive - post a receive on a shared receive queue
41  * @ibsrq: the SRQ to post the receive on
42  * @wr: the list of work requests to post
43  * @bad_wr: the first WR to cause a problem is put here
44  *
45  * This may be called from interrupt context.
46  */
47 int ipath_post_srq_receive(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
48                            struct ib_recv_wr **bad_wr)
49 {
50         struct ipath_srq *srq = to_isrq(ibsrq);
51         struct ipath_rwq *wq;
52         unsigned long flags;
53         int ret;
54
55         for (; wr; wr = wr->next) {
56                 struct ipath_rwqe *wqe;
57                 u32 next;
58                 int i;
59
60                 if ((unsigned) wr->num_sge > srq->rq.max_sge) {
61                         *bad_wr = wr;
62                         ret = -ENOMEM;
63                         goto bail;
64                 }
65
66                 spin_lock_irqsave(&srq->rq.lock, flags);
67                 wq = srq->rq.wq;
68                 next = wq->head + 1;
69                 if (next >= srq->rq.size)
70                         next = 0;
71                 if (next == wq->tail) {
72                         spin_unlock_irqrestore(&srq->rq.lock, flags);
73                         *bad_wr = wr;
74                         ret = -ENOMEM;
75                         goto bail;
76                 }
77
78                 wqe = get_rwqe_ptr(&srq->rq, wq->head);
79                 wqe->wr_id = wr->wr_id;
80                 wqe->num_sge = wr->num_sge;
81                 for (i = 0; i < wr->num_sge; i++)
82                         wqe->sg_list[i] = wr->sg_list[i];
83                 wq->head = next;
84                 spin_unlock_irqrestore(&srq->rq.lock, flags);
85         }
86         ret = 0;
87
88 bail:
89         return ret;
90 }
91
92 /**
93  * ipath_create_srq - create a shared receive queue
94  * @ibpd: the protection domain of the SRQ to create
95  * @attr: the attributes of the SRQ
96  * @udata: not used by the InfiniPath verbs driver
97  */
98 struct ib_srq *ipath_create_srq(struct ib_pd *ibpd,
99                                 struct ib_srq_init_attr *srq_init_attr,
100                                 struct ib_udata *udata)
101 {
102         struct ipath_ibdev *dev = to_idev(ibpd->device);
103         struct ipath_srq *srq;
104         u32 sz;
105         struct ib_srq *ret;
106
107         if (srq_init_attr->attr.max_wr == 0) {
108                 ret = ERR_PTR(-EINVAL);
109                 goto done;
110         }
111
112         if ((srq_init_attr->attr.max_sge > ib_ipath_max_srq_sges) ||
113             (srq_init_attr->attr.max_wr > ib_ipath_max_srq_wrs)) {
114                 ret = ERR_PTR(-EINVAL);
115                 goto done;
116         }
117
118         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
119         if (!srq) {
120                 ret = ERR_PTR(-ENOMEM);
121                 goto done;
122         }
123
124         /*
125          * Need to use vmalloc() if we want to support large #s of entries.
126          */
127         srq->rq.size = srq_init_attr->attr.max_wr + 1;
128         srq->rq.max_sge = srq_init_attr->attr.max_sge;
129         sz = sizeof(struct ib_sge) * srq->rq.max_sge +
130                 sizeof(struct ipath_rwqe);
131         srq->rq.wq = vmalloc_user(sizeof(struct ipath_rwq) + srq->rq.size * sz);
132         if (!srq->rq.wq) {
133                 ret = ERR_PTR(-ENOMEM);
134                 goto bail_srq;
135         }
136
137         /*
138          * Return the address of the RWQ as the offset to mmap.
139          * See ipath_mmap() for details.
140          */
141         if (udata && udata->outlen >= sizeof(__u64)) {
142                 int err;
143                 u32 s = sizeof(struct ipath_rwq) + srq->rq.size * sz;
144
145                 srq->ip =
146                     ipath_create_mmap_info(dev, s,
147                                            ibpd->uobject->context,
148                                            srq->rq.wq);
149                 if (!srq->ip) {
150                         ret = ERR_PTR(-ENOMEM);
151                         goto bail_wq;
152                 }
153
154                 err = ib_copy_to_udata(udata, &srq->ip->offset,
155                                        sizeof(srq->ip->offset));
156                 if (err) {
157                         ret = ERR_PTR(err);
158                         goto bail_ip;
159                 }
160         } else
161                 srq->ip = NULL;
162
163         /*
164          * ib_create_srq() will initialize srq->ibsrq.
165          */
166         spin_lock_init(&srq->rq.lock);
167         srq->rq.wq->head = 0;
168         srq->rq.wq->tail = 0;
169         srq->limit = srq_init_attr->attr.srq_limit;
170
171         spin_lock(&dev->n_srqs_lock);
172         if (dev->n_srqs_allocated == ib_ipath_max_srqs) {
173                 spin_unlock(&dev->n_srqs_lock);
174                 ret = ERR_PTR(-ENOMEM);
175                 goto bail_ip;
176         }
177
178         dev->n_srqs_allocated++;
179         spin_unlock(&dev->n_srqs_lock);
180
181         if (srq->ip) {
182                 spin_lock_irq(&dev->pending_lock);
183                 list_add(&srq->ip->pending_mmaps, &dev->pending_mmaps);
184                 spin_unlock_irq(&dev->pending_lock);
185         }
186
187         ret = &srq->ibsrq;
188         goto done;
189
190 bail_ip:
191         kfree(srq->ip);
192 bail_wq:
193         vfree(srq->rq.wq);
194 bail_srq:
195         kfree(srq);
196 done:
197         return ret;
198 }
199
200 /**
201  * ipath_modify_srq - modify a shared receive queue
202  * @ibsrq: the SRQ to modify
203  * @attr: the new attributes of the SRQ
204  * @attr_mask: indicates which attributes to modify
205  * @udata: user data for ipathverbs.so
206  */
207 int ipath_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
208                      enum ib_srq_attr_mask attr_mask,
209                      struct ib_udata *udata)
210 {
211         struct ipath_srq *srq = to_isrq(ibsrq);
212         int ret = 0;
213
214         if (attr_mask & IB_SRQ_MAX_WR) {
215                 struct ipath_rwq *owq;
216                 struct ipath_rwq *wq;
217                 struct ipath_rwqe *p;
218                 u32 sz, size, n, head, tail;
219
220                 /* Check that the requested sizes are below the limits. */
221                 if ((attr->max_wr > ib_ipath_max_srq_wrs) ||
222                     ((attr_mask & IB_SRQ_LIMIT) ?
223                      attr->srq_limit : srq->limit) > attr->max_wr) {
224                         ret = -EINVAL;
225                         goto bail;
226                 }
227
228                 sz = sizeof(struct ipath_rwqe) +
229                         srq->rq.max_sge * sizeof(struct ib_sge);
230                 size = attr->max_wr + 1;
231                 wq = vmalloc_user(sizeof(struct ipath_rwq) + size * sz);
232                 if (!wq) {
233                         ret = -ENOMEM;
234                         goto bail;
235                 }
236
237                 /*
238                  * Return the address of the RWQ as the offset to mmap.
239                  * See ipath_mmap() for details.
240                  */
241                 if (udata && udata->inlen >= sizeof(__u64)) {
242                         __u64 offset_addr;
243                         __u64 offset = (__u64) wq;
244
245                         ret = ib_copy_from_udata(&offset_addr, udata,
246                                                  sizeof(offset_addr));
247                         if (ret) {
248                                 vfree(wq);
249                                 goto bail;
250                         }
251                         udata->outbuf = (void __user *) offset_addr;
252                         ret = ib_copy_to_udata(udata, &offset,
253                                                sizeof(offset));
254                         if (ret) {
255                                 vfree(wq);
256                                 goto bail;
257                         }
258                 }
259
260                 spin_lock_irq(&srq->rq.lock);
261                 /*
262                  * validate head pointer value and compute
263                  * the number of remaining WQEs.
264                  */
265                 owq = srq->rq.wq;
266                 head = owq->head;
267                 if (head >= srq->rq.size)
268                         head = 0;
269                 tail = owq->tail;
270                 if (tail >= srq->rq.size)
271                         tail = 0;
272                 n = head;
273                 if (n < tail)
274                         n += srq->rq.size - tail;
275                 else
276                         n -= tail;
277                 if (size <= n) {
278                         spin_unlock_irq(&srq->rq.lock);
279                         vfree(wq);
280                         ret = -EINVAL;
281                         goto bail;
282                 }
283                 n = 0;
284                 p = wq->wq;
285                 while (tail != head) {
286                         struct ipath_rwqe *wqe;
287                         int i;
288
289                         wqe = get_rwqe_ptr(&srq->rq, tail);
290                         p->wr_id = wqe->wr_id;
291                         p->num_sge = wqe->num_sge;
292                         for (i = 0; i < wqe->num_sge; i++)
293                                 p->sg_list[i] = wqe->sg_list[i];
294                         n++;
295                         p = (struct ipath_rwqe *)((char *) p + sz);
296                         if (++tail >= srq->rq.size)
297                                 tail = 0;
298                 }
299                 srq->rq.wq = wq;
300                 srq->rq.size = size;
301                 wq->head = n;
302                 wq->tail = 0;
303                 if (attr_mask & IB_SRQ_LIMIT)
304                         srq->limit = attr->srq_limit;
305                 spin_unlock_irq(&srq->rq.lock);
306
307                 vfree(owq);
308
309                 if (srq->ip) {
310                         struct ipath_mmap_info *ip = srq->ip;
311                         struct ipath_ibdev *dev = to_idev(srq->ibsrq.device);
312                         u32 s = sizeof(struct ipath_rwq) + size * sz;
313
314                         ipath_update_mmap_info(dev, ip, s, wq);
315                         spin_lock_irq(&dev->pending_lock);
316                         if (list_empty(&ip->pending_mmaps))
317                                 list_add(&ip->pending_mmaps,
318                                          &dev->pending_mmaps);
319                         spin_unlock_irq(&dev->pending_lock);
320                 }
321         } else if (attr_mask & IB_SRQ_LIMIT) {
322                 spin_lock_irq(&srq->rq.lock);
323                 if (attr->srq_limit >= srq->rq.size)
324                         ret = -EINVAL;
325                 else
326                         srq->limit = attr->srq_limit;
327                 spin_unlock_irq(&srq->rq.lock);
328         }
329
330 bail:
331         return ret;
332 }
333
334 int ipath_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
335 {
336         struct ipath_srq *srq = to_isrq(ibsrq);
337
338         attr->max_wr = srq->rq.size - 1;
339         attr->max_sge = srq->rq.max_sge;
340         attr->srq_limit = srq->limit;
341         return 0;
342 }
343
344 /**
345  * ipath_destroy_srq - destroy a shared receive queue
346  * @ibsrq: the SRQ to destroy
347  */
348 int ipath_destroy_srq(struct ib_srq *ibsrq)
349 {
350         struct ipath_srq *srq = to_isrq(ibsrq);
351         struct ipath_ibdev *dev = to_idev(ibsrq->device);
352
353         spin_lock(&dev->n_srqs_lock);
354         dev->n_srqs_allocated--;
355         spin_unlock(&dev->n_srqs_lock);
356         if (srq->ip)
357                 kref_put(&srq->ip->ref, ipath_release_mmap_info);
358         else
359                 vfree(srq->rq.wq);
360         kfree(srq);
361
362         return 0;
363 }