204619702f9d7d9401bf5dd65012fbf2e0062de6
[linux-2.6.git] / drivers / infiniband / hw / mlx4 / srq.c
1 /*
2  * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32
33 #include <linux/mlx4/qp.h>
34 #include <linux/mlx4/srq.h>
35
36 #include "mlx4_ib.h"
37 #include "user.h"
38
39 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
40 {
41         return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
42 }
43
44 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
45 {
46         struct ib_event event;
47         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
48
49         if (ibsrq->event_handler) {
50                 event.device      = ibsrq->device;
51                 event.element.srq = ibsrq;
52                 switch (type) {
53                 case MLX4_EVENT_TYPE_SRQ_LIMIT:
54                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
55                         break;
56                 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
57                         event.event = IB_EVENT_SRQ_ERR;
58                         break;
59                 default:
60                         printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
61                                "on SRQ %06x\n", type, srq->srqn);
62                         return;
63                 }
64
65                 ibsrq->event_handler(&event, ibsrq->srq_context);
66         }
67 }
68
69 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
70                                   struct ib_srq_init_attr *init_attr,
71                                   struct ib_udata *udata)
72 {
73         struct mlx4_ib_dev *dev = to_mdev(pd->device);
74         struct mlx4_ib_srq *srq;
75         struct mlx4_wqe_srq_next_seg *next;
76         int desc_size;
77         int buf_size;
78         int err;
79         int i;
80
81         /* Sanity check SRQ size before proceeding */
82         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
83             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
84                 return ERR_PTR(-EINVAL);
85
86         srq = kmalloc(sizeof *srq, GFP_KERNEL);
87         if (!srq)
88                 return ERR_PTR(-ENOMEM);
89
90         mutex_init(&srq->mutex);
91         spin_lock_init(&srq->lock);
92         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
93         srq->msrq.max_gs = init_attr->attr.max_sge;
94
95         desc_size = max(32UL,
96                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
97                                            srq->msrq.max_gs *
98                                            sizeof (struct mlx4_wqe_data_seg)));
99         srq->msrq.wqe_shift = ilog2(desc_size);
100
101         buf_size = srq->msrq.max * desc_size;
102
103         if (pd->uobject) {
104                 struct mlx4_ib_create_srq ucmd;
105
106                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
107                         err = -EFAULT;
108                         goto err_srq;
109                 }
110
111                 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
112                                         buf_size, 0);
113                 if (IS_ERR(srq->umem)) {
114                         err = PTR_ERR(srq->umem);
115                         goto err_srq;
116                 }
117
118                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
119                                     ilog2(srq->umem->page_size), &srq->mtt);
120                 if (err)
121                         goto err_buf;
122
123                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
124                 if (err)
125                         goto err_mtt;
126
127                 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
128                                           ucmd.db_addr, &srq->db);
129                 if (err)
130                         goto err_mtt;
131         } else {
132                 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
133                 if (err)
134                         goto err_srq;
135
136                 *srq->db.db = 0;
137
138                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
139                         err = -ENOMEM;
140                         goto err_db;
141                 }
142
143                 srq->head    = 0;
144                 srq->tail    = srq->msrq.max - 1;
145                 srq->wqe_ctr = 0;
146
147                 for (i = 0; i < srq->msrq.max; ++i) {
148                         next = get_wqe(srq, i);
149                         next->next_wqe_index =
150                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
151                 }
152
153                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
154                                     &srq->mtt);
155                 if (err)
156                         goto err_buf;
157
158                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
159                 if (err)
160                         goto err_mtt;
161
162                 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
163                 if (!srq->wrid) {
164                         err = -ENOMEM;
165                         goto err_mtt;
166                 }
167         }
168
169         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
170                              srq->db.dma, &srq->msrq);
171         if (err)
172                 goto err_wrid;
173
174         srq->msrq.event = mlx4_ib_srq_event;
175
176         if (pd->uobject)
177                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
178                         err = -EFAULT;
179                         goto err_wrid;
180                 }
181
182         init_attr->attr.max_wr = srq->msrq.max - 1;
183
184         return &srq->ibsrq;
185
186 err_wrid:
187         if (pd->uobject)
188                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
189         else
190                 kfree(srq->wrid);
191
192 err_mtt:
193         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
194
195 err_buf:
196         if (pd->uobject)
197                 ib_umem_release(srq->umem);
198         else
199                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
200
201 err_db:
202         if (!pd->uobject)
203                 mlx4_db_free(dev->dev, &srq->db);
204
205 err_srq:
206         kfree(srq);
207
208         return ERR_PTR(err);
209 }
210
211 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
212                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
213 {
214         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
215         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
216         int ret;
217
218         /* We don't support resizing SRQs (yet?) */
219         if (attr_mask & IB_SRQ_MAX_WR)
220                 return -EINVAL;
221
222         if (attr_mask & IB_SRQ_LIMIT) {
223                 if (attr->srq_limit >= srq->msrq.max)
224                         return -EINVAL;
225
226                 mutex_lock(&srq->mutex);
227                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
228                 mutex_unlock(&srq->mutex);
229
230                 if (ret)
231                         return ret;
232         }
233
234         return 0;
235 }
236
237 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
238 {
239         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
240         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
241         int ret;
242         int limit_watermark;
243
244         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
245         if (ret)
246                 return ret;
247
248         srq_attr->srq_limit = limit_watermark;
249         srq_attr->max_wr    = srq->msrq.max - 1;
250         srq_attr->max_sge   = srq->msrq.max_gs;
251
252         return 0;
253 }
254
255 int mlx4_ib_destroy_srq(struct ib_srq *srq)
256 {
257         struct mlx4_ib_dev *dev = to_mdev(srq->device);
258         struct mlx4_ib_srq *msrq = to_msrq(srq);
259
260         mlx4_srq_free(dev->dev, &msrq->msrq);
261         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
262
263         if (srq->uobject) {
264                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
265                 ib_umem_release(msrq->umem);
266         } else {
267                 kfree(msrq->wrid);
268                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
269                               &msrq->buf);
270                 mlx4_db_free(dev->dev, &msrq->db);
271         }
272
273         kfree(msrq);
274
275         return 0;
276 }
277
278 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
279 {
280         struct mlx4_wqe_srq_next_seg *next;
281
282         /* always called with interrupts disabled. */
283         spin_lock(&srq->lock);
284
285         next = get_wqe(srq, srq->tail);
286         next->next_wqe_index = cpu_to_be16(wqe_index);
287         srq->tail = wqe_index;
288
289         spin_unlock(&srq->lock);
290 }
291
292 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
293                           struct ib_recv_wr **bad_wr)
294 {
295         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
296         struct mlx4_wqe_srq_next_seg *next;
297         struct mlx4_wqe_data_seg *scat;
298         unsigned long flags;
299         int err = 0;
300         int nreq;
301         int i;
302
303         spin_lock_irqsave(&srq->lock, flags);
304
305         for (nreq = 0; wr; ++nreq, wr = wr->next) {
306                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
307                         err = -EINVAL;
308                         *bad_wr = wr;
309                         break;
310                 }
311
312                 if (unlikely(srq->head == srq->tail)) {
313                         err = -ENOMEM;
314                         *bad_wr = wr;
315                         break;
316                 }
317
318                 srq->wrid[srq->head] = wr->wr_id;
319
320                 next      = get_wqe(srq, srq->head);
321                 srq->head = be16_to_cpu(next->next_wqe_index);
322                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
323
324                 for (i = 0; i < wr->num_sge; ++i) {
325                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
326                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
327                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
328                 }
329
330                 if (i < srq->msrq.max_gs) {
331                         scat[i].byte_count = 0;
332                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
333                         scat[i].addr       = 0;
334                 }
335         }
336
337         if (likely(nreq)) {
338                 srq->wqe_ctr += nreq;
339
340                 /*
341                  * Make sure that descriptors are written before
342                  * doorbell record.
343                  */
344                 wmb();
345
346                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
347         }
348
349         spin_unlock_irqrestore(&srq->lock, flags);
350
351         return err;
352 }