These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / 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 #include <linux/vmalloc.h>
38
39 #include "mlx4_ib.h"
40 #include "user.h"
41
42 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
43 {
44         return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
45 }
46
47 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
48 {
49         struct ib_event event;
50         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
51
52         if (ibsrq->event_handler) {
53                 event.device      = ibsrq->device;
54                 event.element.srq = ibsrq;
55                 switch (type) {
56                 case MLX4_EVENT_TYPE_SRQ_LIMIT:
57                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
58                         break;
59                 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
60                         event.event = IB_EVENT_SRQ_ERR;
61                         break;
62                 default:
63                         pr_warn("Unexpected event type %d "
64                                "on SRQ %06x\n", type, srq->srqn);
65                         return;
66                 }
67
68                 ibsrq->event_handler(&event, ibsrq->srq_context);
69         }
70 }
71
72 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
73                                   struct ib_srq_init_attr *init_attr,
74                                   struct ib_udata *udata)
75 {
76         struct mlx4_ib_dev *dev = to_mdev(pd->device);
77         struct mlx4_ib_srq *srq;
78         struct mlx4_wqe_srq_next_seg *next;
79         struct mlx4_wqe_data_seg *scatter;
80         u32 cqn;
81         u16 xrcdn;
82         int desc_size;
83         int buf_size;
84         int err;
85         int i;
86
87         /* Sanity check SRQ size before proceeding */
88         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
89             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
90                 return ERR_PTR(-EINVAL);
91
92         srq = kmalloc(sizeof *srq, GFP_KERNEL);
93         if (!srq)
94                 return ERR_PTR(-ENOMEM);
95
96         mutex_init(&srq->mutex);
97         spin_lock_init(&srq->lock);
98         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
99         srq->msrq.max_gs = init_attr->attr.max_sge;
100
101         desc_size = max(32UL,
102                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
103                                            srq->msrq.max_gs *
104                                            sizeof (struct mlx4_wqe_data_seg)));
105         srq->msrq.wqe_shift = ilog2(desc_size);
106
107         buf_size = srq->msrq.max * desc_size;
108
109         if (pd->uobject) {
110                 struct mlx4_ib_create_srq ucmd;
111
112                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
113                         err = -EFAULT;
114                         goto err_srq;
115                 }
116
117                 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
118                                         buf_size, 0, 0);
119                 if (IS_ERR(srq->umem)) {
120                         err = PTR_ERR(srq->umem);
121                         goto err_srq;
122                 }
123
124                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
125                                     ilog2(srq->umem->page_size), &srq->mtt);
126                 if (err)
127                         goto err_buf;
128
129                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
130                 if (err)
131                         goto err_mtt;
132
133                 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
134                                           ucmd.db_addr, &srq->db);
135                 if (err)
136                         goto err_mtt;
137         } else {
138                 err = mlx4_db_alloc(dev->dev, &srq->db, 0, GFP_KERNEL);
139                 if (err)
140                         goto err_srq;
141
142                 *srq->db.db = 0;
143
144                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf,
145                                    GFP_KERNEL)) {
146                         err = -ENOMEM;
147                         goto err_db;
148                 }
149
150                 srq->head    = 0;
151                 srq->tail    = srq->msrq.max - 1;
152                 srq->wqe_ctr = 0;
153
154                 for (i = 0; i < srq->msrq.max; ++i) {
155                         next = get_wqe(srq, i);
156                         next->next_wqe_index =
157                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
158
159                         for (scatter = (void *) (next + 1);
160                              (void *) scatter < (void *) next + desc_size;
161                              ++scatter)
162                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
163                 }
164
165                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
166                                     &srq->mtt);
167                 if (err)
168                         goto err_buf;
169
170                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf, GFP_KERNEL);
171                 if (err)
172                         goto err_mtt;
173
174                 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
175                 if (!srq->wrid) {
176                         srq->wrid = __vmalloc(srq->msrq.max * sizeof(u64),
177                                               GFP_KERNEL, PAGE_KERNEL);
178                         if (!srq->wrid) {
179                                 err = -ENOMEM;
180                                 goto err_mtt;
181                         }
182                 }
183         }
184
185         cqn = (init_attr->srq_type == IB_SRQT_XRC) ?
186                 to_mcq(init_attr->ext.xrc.cq)->mcq.cqn : 0;
187         xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
188                 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
189                 (u16) dev->dev->caps.reserved_xrcds;
190         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
191                              srq->db.dma, &srq->msrq);
192         if (err)
193                 goto err_wrid;
194
195         srq->msrq.event = mlx4_ib_srq_event;
196         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
197
198         if (pd->uobject)
199                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
200                         err = -EFAULT;
201                         goto err_wrid;
202                 }
203
204         init_attr->attr.max_wr = srq->msrq.max - 1;
205
206         return &srq->ibsrq;
207
208 err_wrid:
209         if (pd->uobject)
210                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
211         else
212                 kvfree(srq->wrid);
213
214 err_mtt:
215         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
216
217 err_buf:
218         if (pd->uobject)
219                 ib_umem_release(srq->umem);
220         else
221                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
222
223 err_db:
224         if (!pd->uobject)
225                 mlx4_db_free(dev->dev, &srq->db);
226
227 err_srq:
228         kfree(srq);
229
230         return ERR_PTR(err);
231 }
232
233 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
234                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
235 {
236         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
237         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
238         int ret;
239
240         /* We don't support resizing SRQs (yet?) */
241         if (attr_mask & IB_SRQ_MAX_WR)
242                 return -EINVAL;
243
244         if (attr_mask & IB_SRQ_LIMIT) {
245                 if (attr->srq_limit >= srq->msrq.max)
246                         return -EINVAL;
247
248                 mutex_lock(&srq->mutex);
249                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
250                 mutex_unlock(&srq->mutex);
251
252                 if (ret)
253                         return ret;
254         }
255
256         return 0;
257 }
258
259 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
260 {
261         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
262         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
263         int ret;
264         int limit_watermark;
265
266         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
267         if (ret)
268                 return ret;
269
270         srq_attr->srq_limit = limit_watermark;
271         srq_attr->max_wr    = srq->msrq.max - 1;
272         srq_attr->max_sge   = srq->msrq.max_gs;
273
274         return 0;
275 }
276
277 int mlx4_ib_destroy_srq(struct ib_srq *srq)
278 {
279         struct mlx4_ib_dev *dev = to_mdev(srq->device);
280         struct mlx4_ib_srq *msrq = to_msrq(srq);
281
282         mlx4_srq_free(dev->dev, &msrq->msrq);
283         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
284
285         if (srq->uobject) {
286                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
287                 ib_umem_release(msrq->umem);
288         } else {
289                 kvfree(msrq->wrid);
290                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
291                               &msrq->buf);
292                 mlx4_db_free(dev->dev, &msrq->db);
293         }
294
295         kfree(msrq);
296
297         return 0;
298 }
299
300 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
301 {
302         struct mlx4_wqe_srq_next_seg *next;
303
304         /* always called with interrupts disabled. */
305         spin_lock(&srq->lock);
306
307         next = get_wqe(srq, srq->tail);
308         next->next_wqe_index = cpu_to_be16(wqe_index);
309         srq->tail = wqe_index;
310
311         spin_unlock(&srq->lock);
312 }
313
314 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
315                           struct ib_recv_wr **bad_wr)
316 {
317         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
318         struct mlx4_wqe_srq_next_seg *next;
319         struct mlx4_wqe_data_seg *scat;
320         unsigned long flags;
321         int err = 0;
322         int nreq;
323         int i;
324         struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device);
325
326         spin_lock_irqsave(&srq->lock, flags);
327         if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
328                 err = -EIO;
329                 *bad_wr = wr;
330                 nreq = 0;
331                 goto out;
332         }
333
334         for (nreq = 0; wr; ++nreq, wr = wr->next) {
335                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
336                         err = -EINVAL;
337                         *bad_wr = wr;
338                         break;
339                 }
340
341                 if (unlikely(srq->head == srq->tail)) {
342                         err = -ENOMEM;
343                         *bad_wr = wr;
344                         break;
345                 }
346
347                 srq->wrid[srq->head] = wr->wr_id;
348
349                 next      = get_wqe(srq, srq->head);
350                 srq->head = be16_to_cpu(next->next_wqe_index);
351                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
352
353                 for (i = 0; i < wr->num_sge; ++i) {
354                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
355                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
356                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
357                 }
358
359                 if (i < srq->msrq.max_gs) {
360                         scat[i].byte_count = 0;
361                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
362                         scat[i].addr       = 0;
363                 }
364         }
365
366         if (likely(nreq)) {
367                 srq->wqe_ctr += nreq;
368
369                 /*
370                  * Make sure that descriptors are written before
371                  * doorbell record.
372                  */
373                 wmb();
374
375                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
376         }
377 out:
378
379         spin_unlock_irqrestore(&srq->lock, flags);
380
381         return err;
382 }