Merge branch 'linus' into sched/core
[linux-3.10.git] / drivers / infiniband / hw / mlx4 / srq.c
1 /*
2  * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
3  * Copyright (c) 2007, 2008 Mellanox Technologies. 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/mlx4/qp.h>
35 #include <linux/mlx4/srq.h>
36 #include <linux/slab.h>
37
38 #include "mlx4_ib.h"
39 #include "user.h"
40
41 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
42 {
43         return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
44 }
45
46 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
47 {
48         struct ib_event event;
49         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
50
51         if (ibsrq->event_handler) {
52                 event.device      = ibsrq->device;
53                 event.element.srq = ibsrq;
54                 switch (type) {
55                 case MLX4_EVENT_TYPE_SRQ_LIMIT:
56                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
57                         break;
58                 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
59                         event.event = IB_EVENT_SRQ_ERR;
60                         break;
61                 default:
62                         printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
63                                "on SRQ %06x\n", type, srq->srqn);
64                         return;
65                 }
66
67                 ibsrq->event_handler(&event, ibsrq->srq_context);
68         }
69 }
70
71 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
72                                   struct ib_srq_init_attr *init_attr,
73                                   struct ib_udata *udata)
74 {
75         struct mlx4_ib_dev *dev = to_mdev(pd->device);
76         struct mlx4_ib_srq *srq;
77         struct mlx4_wqe_srq_next_seg *next;
78         struct mlx4_wqe_data_seg *scatter;
79         int desc_size;
80         int buf_size;
81         int err;
82         int i;
83
84         /* Sanity check SRQ size before proceeding */
85         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
86             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
87                 return ERR_PTR(-EINVAL);
88
89         srq = kmalloc(sizeof *srq, GFP_KERNEL);
90         if (!srq)
91                 return ERR_PTR(-ENOMEM);
92
93         mutex_init(&srq->mutex);
94         spin_lock_init(&srq->lock);
95         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
96         srq->msrq.max_gs = init_attr->attr.max_sge;
97
98         desc_size = max(32UL,
99                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
100                                            srq->msrq.max_gs *
101                                            sizeof (struct mlx4_wqe_data_seg)));
102         srq->msrq.wqe_shift = ilog2(desc_size);
103
104         buf_size = srq->msrq.max * desc_size;
105
106         if (pd->uobject) {
107                 struct mlx4_ib_create_srq ucmd;
108
109                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
110                         err = -EFAULT;
111                         goto err_srq;
112                 }
113
114                 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
115                                         buf_size, 0, 0);
116                 if (IS_ERR(srq->umem)) {
117                         err = PTR_ERR(srq->umem);
118                         goto err_srq;
119                 }
120
121                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
122                                     ilog2(srq->umem->page_size), &srq->mtt);
123                 if (err)
124                         goto err_buf;
125
126                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
127                 if (err)
128                         goto err_mtt;
129
130                 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
131                                           ucmd.db_addr, &srq->db);
132                 if (err)
133                         goto err_mtt;
134         } else {
135                 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
136                 if (err)
137                         goto err_srq;
138
139                 *srq->db.db = 0;
140
141                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
142                         err = -ENOMEM;
143                         goto err_db;
144                 }
145
146                 srq->head    = 0;
147                 srq->tail    = srq->msrq.max - 1;
148                 srq->wqe_ctr = 0;
149
150                 for (i = 0; i < srq->msrq.max; ++i) {
151                         next = get_wqe(srq, i);
152                         next->next_wqe_index =
153                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
154
155                         for (scatter = (void *) (next + 1);
156                              (void *) scatter < (void *) next + desc_size;
157                              ++scatter)
158                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
159                 }
160
161                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
162                                     &srq->mtt);
163                 if (err)
164                         goto err_buf;
165
166                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
167                 if (err)
168                         goto err_mtt;
169
170                 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
171                 if (!srq->wrid) {
172                         err = -ENOMEM;
173                         goto err_mtt;
174                 }
175         }
176
177         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
178                              srq->db.dma, &srq->msrq);
179         if (err)
180                 goto err_wrid;
181
182         srq->msrq.event = mlx4_ib_srq_event;
183
184         if (pd->uobject)
185                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
186                         err = -EFAULT;
187                         goto err_wrid;
188                 }
189
190         init_attr->attr.max_wr = srq->msrq.max - 1;
191
192         return &srq->ibsrq;
193
194 err_wrid:
195         if (pd->uobject)
196                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
197         else
198                 kfree(srq->wrid);
199
200 err_mtt:
201         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
202
203 err_buf:
204         if (pd->uobject)
205                 ib_umem_release(srq->umem);
206         else
207                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
208
209 err_db:
210         if (!pd->uobject)
211                 mlx4_db_free(dev->dev, &srq->db);
212
213 err_srq:
214         kfree(srq);
215
216         return ERR_PTR(err);
217 }
218
219 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
220                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
221 {
222         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
223         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
224         int ret;
225
226         /* We don't support resizing SRQs (yet?) */
227         if (attr_mask & IB_SRQ_MAX_WR)
228                 return -EINVAL;
229
230         if (attr_mask & IB_SRQ_LIMIT) {
231                 if (attr->srq_limit >= srq->msrq.max)
232                         return -EINVAL;
233
234                 mutex_lock(&srq->mutex);
235                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
236                 mutex_unlock(&srq->mutex);
237
238                 if (ret)
239                         return ret;
240         }
241
242         return 0;
243 }
244
245 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
246 {
247         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
248         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
249         int ret;
250         int limit_watermark;
251
252         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
253         if (ret)
254                 return ret;
255
256         srq_attr->srq_limit = limit_watermark;
257         srq_attr->max_wr    = srq->msrq.max - 1;
258         srq_attr->max_sge   = srq->msrq.max_gs;
259
260         return 0;
261 }
262
263 int mlx4_ib_destroy_srq(struct ib_srq *srq)
264 {
265         struct mlx4_ib_dev *dev = to_mdev(srq->device);
266         struct mlx4_ib_srq *msrq = to_msrq(srq);
267
268         mlx4_srq_free(dev->dev, &msrq->msrq);
269         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
270
271         if (srq->uobject) {
272                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
273                 ib_umem_release(msrq->umem);
274         } else {
275                 kfree(msrq->wrid);
276                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
277                               &msrq->buf);
278                 mlx4_db_free(dev->dev, &msrq->db);
279         }
280
281         kfree(msrq);
282
283         return 0;
284 }
285
286 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
287 {
288         struct mlx4_wqe_srq_next_seg *next;
289
290         /* always called with interrupts disabled. */
291         spin_lock(&srq->lock);
292
293         next = get_wqe(srq, srq->tail);
294         next->next_wqe_index = cpu_to_be16(wqe_index);
295         srq->tail = wqe_index;
296
297         spin_unlock(&srq->lock);
298 }
299
300 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
301                           struct ib_recv_wr **bad_wr)
302 {
303         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
304         struct mlx4_wqe_srq_next_seg *next;
305         struct mlx4_wqe_data_seg *scat;
306         unsigned long flags;
307         int err = 0;
308         int nreq;
309         int i;
310
311         spin_lock_irqsave(&srq->lock, flags);
312
313         for (nreq = 0; wr; ++nreq, wr = wr->next) {
314                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
315                         err = -EINVAL;
316                         *bad_wr = wr;
317                         break;
318                 }
319
320                 if (unlikely(srq->head == srq->tail)) {
321                         err = -ENOMEM;
322                         *bad_wr = wr;
323                         break;
324                 }
325
326                 srq->wrid[srq->head] = wr->wr_id;
327
328                 next      = get_wqe(srq, srq->head);
329                 srq->head = be16_to_cpu(next->next_wqe_index);
330                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
331
332                 for (i = 0; i < wr->num_sge; ++i) {
333                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
334                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
335                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
336                 }
337
338                 if (i < srq->msrq.max_gs) {
339                         scat[i].byte_count = 0;
340                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
341                         scat[i].addr       = 0;
342                 }
343         }
344
345         if (likely(nreq)) {
346                 srq->wqe_ctr += nreq;
347
348                 /*
349                  * Make sure that descriptors are written before
350                  * doorbell record.
351                  */
352                 wmb();
353
354                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
355         }
356
357         spin_unlock_irqrestore(&srq->lock, flags);
358
359         return err;
360 }