Return real vendor/part id in query_device
[akaros.git] / kern / drivers / net / mlx4u / 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>       /* AKAROS */
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                         pr_warn("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         u32 cqn;
80         u16 xrcdn;
81         int desc_size;
82         int buf_size;
83         int err;
84         int i;
85
86         /* Sanity check SRQ size before proceeding */
87         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
88             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
89                 return ERR_PTR(-EINVAL);
90
91         srq = kmalloc(sizeof *srq, GFP_KERNEL);
92         if (!srq)
93                 return ERR_PTR(-ENOMEM);
94
95         mutex_init(&srq->mutex);
96         spin_lock_init(&srq->lock);
97         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
98         srq->msrq.max_gs = init_attr->attr.max_sge;
99
100         desc_size = max(32UL,
101                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
102                                            srq->msrq.max_gs *
103                                            sizeof (struct mlx4_wqe_data_seg)));
104         srq->msrq.wqe_shift = ilog2(desc_size);
105
106         buf_size = srq->msrq.max * desc_size;
107
108         if (pd->uobject) {
109                 struct mlx4_ib_create_srq ucmd;
110
111                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
112                         err = -EFAULT;
113                         goto err_srq;
114                 }
115
116                 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
117                                         buf_size, 0, 0);
118                 if (IS_ERR(srq->umem)) {
119                         err = PTR_ERR(srq->umem);
120                         goto err_srq;
121                 }
122
123                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
124                                     ilog2(srq->umem->page_size), &srq->mtt);
125                 if (err)
126                         goto err_buf;
127
128                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
129                 if (err)
130                         goto err_mtt;
131
132                 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
133                                           ucmd.db_addr, &srq->db);
134                 if (err)
135                         goto err_mtt;
136         } else {
137                 err = mlx4_db_alloc(dev->dev, &srq->db, 0, GFP_KERNEL);
138                 if (err)
139                         goto err_srq;
140
141                 *srq->db.db = 0;
142
143                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf,
144                                    GFP_KERNEL)) {
145                         err = -ENOMEM;
146                         goto err_db;
147                 }
148
149                 srq->head    = 0;
150                 srq->tail    = srq->msrq.max - 1;
151                 srq->wqe_ctr = 0;
152
153                 for (i = 0; i < srq->msrq.max; ++i) {
154                         next = get_wqe(srq, i);
155                         next->next_wqe_index =
156                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
157
158                         for (scatter = (void *) (next + 1);
159                              (void *) scatter < (void *) next + desc_size;
160                              ++scatter)
161                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
162                 }
163
164                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
165                                     &srq->mtt);
166                 if (err)
167                         goto err_buf;
168
169                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf, GFP_KERNEL);
170                 if (err)
171                         goto err_mtt;
172
173                 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
174                 if (!srq->wrid) {
175                         err = -ENOMEM;
176                         goto err_mtt;
177                 }
178         }
179
180         cqn = (init_attr->srq_type == IB_SRQT_XRC) ?
181                 to_mcq(init_attr->ext.xrc.cq)->mcq.cqn : 0;
182         xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
183                 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
184                 (u16) dev->dev->caps.reserved_xrcds;
185         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
186                              srq->db.dma, &srq->msrq);
187         if (err)
188                 goto err_wrid;
189
190         srq->msrq.event = mlx4_ib_srq_event;
191         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
192
193         if (pd->uobject)
194                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
195                         err = -EFAULT;
196                         goto err_wrid;
197                 }
198
199         init_attr->attr.max_wr = srq->msrq.max - 1;
200
201         return &srq->ibsrq;
202
203 err_wrid:
204         if (pd->uobject)
205                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
206         else
207                 kfree(srq->wrid);
208
209 err_mtt:
210         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
211
212 err_buf:
213         if (pd->uobject)
214                 ib_umem_release(srq->umem);
215         else
216                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
217
218 err_db:
219         if (!pd->uobject)
220                 mlx4_db_free(dev->dev, &srq->db);
221
222 err_srq:
223         kfree(srq);
224
225         return ERR_PTR(err);
226 }
227
228 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
229                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
230 {
231         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
232         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
233         int ret;
234
235         /* We don't support resizing SRQs (yet?) */
236         if (attr_mask & IB_SRQ_MAX_WR)
237                 return -EINVAL;
238
239         if (attr_mask & IB_SRQ_LIMIT) {
240                 if (attr->srq_limit >= srq->msrq.max)
241                         return -EINVAL;
242
243                 mutex_lock(&srq->mutex);
244                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
245                 mutex_unlock(&srq->mutex);
246
247                 if (ret)
248                         return ret;
249         }
250
251         return 0;
252 }
253
254 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
255 {
256         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
257         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
258         int ret;
259         int limit_watermark;
260
261         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
262         if (ret)
263                 return ret;
264
265         srq_attr->srq_limit = limit_watermark;
266         srq_attr->max_wr    = srq->msrq.max - 1;
267         srq_attr->max_sge   = srq->msrq.max_gs;
268
269         return 0;
270 }
271
272 int mlx4_ib_destroy_srq(struct ib_srq *srq)
273 {
274         struct mlx4_ib_dev *dev = to_mdev(srq->device);
275         struct mlx4_ib_srq *msrq = to_msrq(srq);
276
277         mlx4_srq_free(dev->dev, &msrq->msrq);
278         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
279
280         if (srq->uobject) {
281                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
282                 ib_umem_release(msrq->umem);
283         } else {
284                 kfree(msrq->wrid);
285                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
286                               &msrq->buf);
287                 mlx4_db_free(dev->dev, &msrq->db);
288         }
289
290         kfree(msrq);
291
292         return 0;
293 }
294
295 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
296 {
297         struct mlx4_wqe_srq_next_seg *next;
298
299         /* always called with interrupts disabled. */
300         spin_lock(&srq->lock);
301
302         next = get_wqe(srq, srq->tail);
303         next->next_wqe_index = cpu_to_be16(wqe_index);
304         srq->tail = wqe_index;
305
306         spin_unlock(&srq->lock);
307 }
308
309 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
310                           struct ib_recv_wr **bad_wr)
311 {
312         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
313         struct mlx4_wqe_srq_next_seg *next;
314         struct mlx4_wqe_data_seg *scat;
315         unsigned long flags;
316         int err = 0;
317         int nreq;
318         int i;
319         struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device);
320
321         spin_lock_irqsave(&srq->lock, flags);
322         if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
323                 err = -EIO;
324                 *bad_wr = wr;
325                 nreq = 0;
326                 goto out;
327         }
328
329         for (nreq = 0; wr; ++nreq, wr = wr->next) {
330                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
331                         err = -EINVAL;
332                         *bad_wr = wr;
333                         break;
334                 }
335
336                 if (unlikely(srq->head == srq->tail)) {
337                         err = -ENOMEM;
338                         *bad_wr = wr;
339                         break;
340                 }
341
342                 srq->wrid[srq->head] = wr->wr_id;
343
344                 next      = get_wqe(srq, srq->head);
345                 srq->head = be16_to_cpu(next->next_wqe_index);
346                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
347
348                 for (i = 0; i < wr->num_sge; ++i) {
349                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
350                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
351                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
352                 }
353
354                 if (i < srq->msrq.max_gs) {
355                         scat[i].byte_count = 0;
356                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
357                         scat[i].addr       = 0;
358                 }
359         }
360
361         if (likely(nreq)) {
362                 srq->wqe_ctr += nreq;
363
364                 /*
365                  * Make sure that descriptors are written before
366                  * doorbell record.
367                  */
368                 wmb();
369
370                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
371         }
372 out:
373
374         spin_unlock_irqrestore(&srq->lock, flags);
375
376         return err;
377 }