fa77da6667edbd045ece1dd59b1583ae08307bc6
[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_ibdev *dev = to_idev(ibsrq->device);
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, j;
59
60                 if (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                 next = srq->rq.head + 1;
68                 if (next >= srq->rq.size)
69                         next = 0;
70                 if (next == srq->rq.tail) {
71                         spin_unlock_irqrestore(&srq->rq.lock, flags);
72                         *bad_wr = wr;
73                         ret = -ENOMEM;
74                         goto bail;
75                 }
76
77                 wqe = get_rwqe_ptr(&srq->rq, srq->rq.head);
78                 wqe->wr_id = wr->wr_id;
79                 wqe->sg_list[0].mr = NULL;
80                 wqe->sg_list[0].vaddr = NULL;
81                 wqe->sg_list[0].length = 0;
82                 wqe->sg_list[0].sge_length = 0;
83                 wqe->length = 0;
84                 for (i = 0, j = 0; i < wr->num_sge; i++) {
85                         /* Check LKEY */
86                         if (to_ipd(srq->ibsrq.pd)->user &&
87                             wr->sg_list[i].lkey == 0) {
88                                 spin_unlock_irqrestore(&srq->rq.lock,
89                                                        flags);
90                                 *bad_wr = wr;
91                                 ret = -EINVAL;
92                                 goto bail;
93                         }
94                         if (wr->sg_list[i].length == 0)
95                                 continue;
96                         if (!ipath_lkey_ok(&dev->lk_table,
97                                            &wqe->sg_list[j],
98                                            &wr->sg_list[i],
99                                            IB_ACCESS_LOCAL_WRITE)) {
100                                 spin_unlock_irqrestore(&srq->rq.lock,
101                                                        flags);
102                                 *bad_wr = wr;
103                                 ret = -EINVAL;
104                                 goto bail;
105                         }
106                         wqe->length += wr->sg_list[i].length;
107                         j++;
108                 }
109                 wqe->num_sge = j;
110                 srq->rq.head = next;
111                 spin_unlock_irqrestore(&srq->rq.lock, flags);
112         }
113         ret = 0;
114
115 bail:
116         return ret;
117 }
118
119 /**
120  * ipath_create_srq - create a shared receive queue
121  * @ibpd: the protection domain of the SRQ to create
122  * @attr: the attributes of the SRQ
123  * @udata: not used by the InfiniPath verbs driver
124  */
125 struct ib_srq *ipath_create_srq(struct ib_pd *ibpd,
126                                 struct ib_srq_init_attr *srq_init_attr,
127                                 struct ib_udata *udata)
128 {
129         struct ipath_ibdev *dev = to_idev(ibpd->device);
130         struct ipath_srq *srq;
131         u32 sz;
132         struct ib_srq *ret;
133
134         if (dev->n_srqs_allocated == ib_ipath_max_srqs) {
135                 ret = ERR_PTR(-ENOMEM);
136                 goto bail;
137         }
138
139         if (srq_init_attr->attr.max_wr == 0) {
140                 ret = ERR_PTR(-EINVAL);
141                 goto bail;
142         }
143
144         if ((srq_init_attr->attr.max_sge > ib_ipath_max_srq_sges) ||
145             (srq_init_attr->attr.max_wr > ib_ipath_max_srq_wrs)) {
146                 ret = ERR_PTR(-EINVAL);
147                 goto bail;
148         }
149
150         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
151         if (!srq) {
152                 ret = ERR_PTR(-ENOMEM);
153                 goto bail;
154         }
155
156         /*
157          * Need to use vmalloc() if we want to support large #s of entries.
158          */
159         srq->rq.size = srq_init_attr->attr.max_wr + 1;
160         sz = sizeof(struct ipath_sge) * srq_init_attr->attr.max_sge +
161                 sizeof(struct ipath_rwqe);
162         srq->rq.wq = vmalloc(srq->rq.size * sz);
163         if (!srq->rq.wq) {
164                 kfree(srq);
165                 ret = ERR_PTR(-ENOMEM);
166                 goto bail;
167         }
168
169         /*
170          * ib_create_srq() will initialize srq->ibsrq.
171          */
172         spin_lock_init(&srq->rq.lock);
173         srq->rq.head = 0;
174         srq->rq.tail = 0;
175         srq->rq.max_sge = srq_init_attr->attr.max_sge;
176         srq->limit = srq_init_attr->attr.srq_limit;
177
178         ret = &srq->ibsrq;
179
180         dev->n_srqs_allocated++;
181
182 bail:
183         return ret;
184 }
185
186 /**
187  * ipath_modify_srq - modify a shared receive queue
188  * @ibsrq: the SRQ to modify
189  * @attr: the new attributes of the SRQ
190  * @attr_mask: indicates which attributes to modify
191  * @udata: user data for ipathverbs.so
192  */
193 int ipath_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
194                      enum ib_srq_attr_mask attr_mask,
195                      struct ib_udata *udata)
196 {
197         struct ipath_srq *srq = to_isrq(ibsrq);
198         unsigned long flags;
199         int ret;
200
201         if (attr_mask & IB_SRQ_MAX_WR)
202                 if ((attr->max_wr > ib_ipath_max_srq_wrs) ||
203                     (attr->max_sge > srq->rq.max_sge)) {
204                         ret = -EINVAL;
205                         goto bail;
206                 }
207
208         if (attr_mask & IB_SRQ_LIMIT)
209                 if (attr->srq_limit >= srq->rq.size) {
210                         ret = -EINVAL;
211                         goto bail;
212                 }
213
214         if (attr_mask & IB_SRQ_MAX_WR) {
215                 struct ipath_rwqe *wq, *p;
216                 u32 sz, size, n;
217
218                 sz = sizeof(struct ipath_rwqe) +
219                         attr->max_sge * sizeof(struct ipath_sge);
220                 size = attr->max_wr + 1;
221                 wq = vmalloc(size * sz);
222                 if (!wq) {
223                         ret = -ENOMEM;
224                         goto bail;
225                 }
226
227                 spin_lock_irqsave(&srq->rq.lock, flags);
228                 if (srq->rq.head < srq->rq.tail)
229                         n = srq->rq.size + srq->rq.head - srq->rq.tail;
230                 else
231                         n = srq->rq.head - srq->rq.tail;
232                 if (size <= n || size <= srq->limit) {
233                         spin_unlock_irqrestore(&srq->rq.lock, flags);
234                         vfree(wq);
235                         ret = -EINVAL;
236                         goto bail;
237                 }
238                 n = 0;
239                 p = wq;
240                 while (srq->rq.tail != srq->rq.head) {
241                         struct ipath_rwqe *wqe;
242                         int i;
243
244                         wqe = get_rwqe_ptr(&srq->rq, srq->rq.tail);
245                         p->wr_id = wqe->wr_id;
246                         p->length = wqe->length;
247                         p->num_sge = wqe->num_sge;
248                         for (i = 0; i < wqe->num_sge; i++)
249                                 p->sg_list[i] = wqe->sg_list[i];
250                         n++;
251                         p = (struct ipath_rwqe *)((char *) p + sz);
252                         if (++srq->rq.tail >= srq->rq.size)
253                                 srq->rq.tail = 0;
254                 }
255                 vfree(srq->rq.wq);
256                 srq->rq.wq = wq;
257                 srq->rq.size = size;
258                 srq->rq.head = n;
259                 srq->rq.tail = 0;
260                 srq->rq.max_sge = attr->max_sge;
261                 spin_unlock_irqrestore(&srq->rq.lock, flags);
262         }
263
264         if (attr_mask & IB_SRQ_LIMIT) {
265                 spin_lock_irqsave(&srq->rq.lock, flags);
266                 srq->limit = attr->srq_limit;
267                 spin_unlock_irqrestore(&srq->rq.lock, flags);
268         }
269         ret = 0;
270
271 bail:
272         return ret;
273 }
274
275 int ipath_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
276 {
277         struct ipath_srq *srq = to_isrq(ibsrq);
278
279         attr->max_wr = srq->rq.size - 1;
280         attr->max_sge = srq->rq.max_sge;
281         attr->srq_limit = srq->limit;
282         return 0;
283 }
284
285 /**
286  * ipath_destroy_srq - destroy a shared receive queue
287  * @ibsrq: the SRQ to destroy
288  */
289 int ipath_destroy_srq(struct ib_srq *ibsrq)
290 {
291         struct ipath_srq *srq = to_isrq(ibsrq);
292         struct ipath_ibdev *dev = to_idev(ibsrq->device);
293
294         dev->n_srqs_allocated--;
295         vfree(srq->rq.wq);
296         kfree(srq);
297
298         return 0;
299 }