4fd75afa6a3a90689a12a27c2c8edce5f076fb7d
[linux-2.6.git] / drivers / infiniband / core / uverbs_cmd.c
1 /*
2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
4  * Copyright (c) 2005 PathScale, Inc.  All rights reserved.
5  * Copyright (c) 2006 Mellanox Technologies.  All rights reserved.
6  *
7  * This software is available to you under a choice of one of two
8  * licenses.  You may choose to be licensed under the terms of the GNU
9  * General Public License (GPL) Version 2, available from the file
10  * COPYING in the main directory of this source tree, or the
11  * OpenIB.org BSD license below:
12  *
13  *     Redistribution and use in source and binary forms, with or
14  *     without modification, are permitted provided that the following
15  *     conditions are met:
16  *
17  *      - Redistributions of source code must retain the above
18  *        copyright notice, this list of conditions and the following
19  *        disclaimer.
20  *
21  *      - Redistributions in binary form must reproduce the above
22  *        copyright notice, this list of conditions and the following
23  *        disclaimer in the documentation and/or other materials
24  *        provided with the distribution.
25  *
26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33  * SOFTWARE.
34  *
35  * $Id: uverbs_cmd.c 2708 2005-06-24 17:27:21Z roland $
36  */
37
38 #include <linux/file.h>
39 #include <linux/fs.h>
40
41 #include <asm/uaccess.h>
42
43 #include "uverbs.h"
44
45 static struct lock_class_key pd_lock_key;
46 static struct lock_class_key mr_lock_key;
47 static struct lock_class_key cq_lock_key;
48 static struct lock_class_key qp_lock_key;
49 static struct lock_class_key ah_lock_key;
50 static struct lock_class_key srq_lock_key;
51
52 #define INIT_UDATA(udata, ibuf, obuf, ilen, olen)                       \
53         do {                                                            \
54                 (udata)->inbuf  = (void __user *) (ibuf);               \
55                 (udata)->outbuf = (void __user *) (obuf);               \
56                 (udata)->inlen  = (ilen);                               \
57                 (udata)->outlen = (olen);                               \
58         } while (0)
59
60 /*
61  * The ib_uobject locking scheme is as follows:
62  *
63  * - ib_uverbs_idr_lock protects the uverbs idrs themselves, so it
64  *   needs to be held during all idr operations.  When an object is
65  *   looked up, a reference must be taken on the object's kref before
66  *   dropping this lock.
67  *
68  * - Each object also has an rwsem.  This rwsem must be held for
69  *   reading while an operation that uses the object is performed.
70  *   For example, while registering an MR, the associated PD's
71  *   uobject.mutex must be held for reading.  The rwsem must be held
72  *   for writing while initializing or destroying an object.
73  *
74  * - In addition, each object has a "live" flag.  If this flag is not
75  *   set, then lookups of the object will fail even if it is found in
76  *   the idr.  This handles a reader that blocks and does not acquire
77  *   the rwsem until after the object is destroyed.  The destroy
78  *   operation will set the live flag to 0 and then drop the rwsem;
79  *   this will allow the reader to acquire the rwsem, see that the
80  *   live flag is 0, and then drop the rwsem and its reference to
81  *   object.  The underlying storage will not be freed until the last
82  *   reference to the object is dropped.
83  */
84
85 static void init_uobj(struct ib_uobject *uobj, u64 user_handle,
86                       struct ib_ucontext *context, struct lock_class_key *key)
87 {
88         uobj->user_handle = user_handle;
89         uobj->context     = context;
90         kref_init(&uobj->ref);
91         init_rwsem(&uobj->mutex);
92         lockdep_set_class(&uobj->mutex, key);
93         uobj->live        = 0;
94 }
95
96 static void release_uobj(struct kref *kref)
97 {
98         kfree(container_of(kref, struct ib_uobject, ref));
99 }
100
101 static void put_uobj(struct ib_uobject *uobj)
102 {
103         kref_put(&uobj->ref, release_uobj);
104 }
105
106 static void put_uobj_read(struct ib_uobject *uobj)
107 {
108         up_read(&uobj->mutex);
109         put_uobj(uobj);
110 }
111
112 static void put_uobj_write(struct ib_uobject *uobj)
113 {
114         up_write(&uobj->mutex);
115         put_uobj(uobj);
116 }
117
118 static int idr_add_uobj(struct idr *idr, struct ib_uobject *uobj)
119 {
120         int ret;
121
122 retry:
123         if (!idr_pre_get(idr, GFP_KERNEL))
124                 return -ENOMEM;
125
126         spin_lock(&ib_uverbs_idr_lock);
127         ret = idr_get_new(idr, uobj, &uobj->id);
128         spin_unlock(&ib_uverbs_idr_lock);
129
130         if (ret == -EAGAIN)
131                 goto retry;
132
133         return ret;
134 }
135
136 void idr_remove_uobj(struct idr *idr, struct ib_uobject *uobj)
137 {
138         spin_lock(&ib_uverbs_idr_lock);
139         idr_remove(idr, uobj->id);
140         spin_unlock(&ib_uverbs_idr_lock);
141 }
142
143 static struct ib_uobject *__idr_get_uobj(struct idr *idr, int id,
144                                          struct ib_ucontext *context)
145 {
146         struct ib_uobject *uobj;
147
148         spin_lock(&ib_uverbs_idr_lock);
149         uobj = idr_find(idr, id);
150         if (uobj)
151                 kref_get(&uobj->ref);
152         spin_unlock(&ib_uverbs_idr_lock);
153
154         return uobj;
155 }
156
157 static struct ib_uobject *idr_read_uobj(struct idr *idr, int id,
158                                         struct ib_ucontext *context, int nested)
159 {
160         struct ib_uobject *uobj;
161
162         uobj = __idr_get_uobj(idr, id, context);
163         if (!uobj)
164                 return NULL;
165
166         if (nested)
167                 down_read_nested(&uobj->mutex, SINGLE_DEPTH_NESTING);
168         else
169                 down_read(&uobj->mutex);
170         if (!uobj->live) {
171                 put_uobj_read(uobj);
172                 return NULL;
173         }
174
175         return uobj;
176 }
177
178 static struct ib_uobject *idr_write_uobj(struct idr *idr, int id,
179                                          struct ib_ucontext *context)
180 {
181         struct ib_uobject *uobj;
182
183         uobj = __idr_get_uobj(idr, id, context);
184         if (!uobj)
185                 return NULL;
186
187         down_write(&uobj->mutex);
188         if (!uobj->live) {
189                 put_uobj_write(uobj);
190                 return NULL;
191         }
192
193         return uobj;
194 }
195
196 static void *idr_read_obj(struct idr *idr, int id, struct ib_ucontext *context,
197                           int nested)
198 {
199         struct ib_uobject *uobj;
200
201         uobj = idr_read_uobj(idr, id, context, nested);
202         return uobj ? uobj->object : NULL;
203 }
204
205 static struct ib_pd *idr_read_pd(int pd_handle, struct ib_ucontext *context)
206 {
207         return idr_read_obj(&ib_uverbs_pd_idr, pd_handle, context, 0);
208 }
209
210 static void put_pd_read(struct ib_pd *pd)
211 {
212         put_uobj_read(pd->uobject);
213 }
214
215 static struct ib_cq *idr_read_cq(int cq_handle, struct ib_ucontext *context, int nested)
216 {
217         return idr_read_obj(&ib_uverbs_cq_idr, cq_handle, context, nested);
218 }
219
220 static void put_cq_read(struct ib_cq *cq)
221 {
222         put_uobj_read(cq->uobject);
223 }
224
225 static struct ib_ah *idr_read_ah(int ah_handle, struct ib_ucontext *context)
226 {
227         return idr_read_obj(&ib_uverbs_ah_idr, ah_handle, context, 0);
228 }
229
230 static void put_ah_read(struct ib_ah *ah)
231 {
232         put_uobj_read(ah->uobject);
233 }
234
235 static struct ib_qp *idr_read_qp(int qp_handle, struct ib_ucontext *context)
236 {
237         return idr_read_obj(&ib_uverbs_qp_idr, qp_handle, context, 0);
238 }
239
240 static void put_qp_read(struct ib_qp *qp)
241 {
242         put_uobj_read(qp->uobject);
243 }
244
245 static struct ib_srq *idr_read_srq(int srq_handle, struct ib_ucontext *context)
246 {
247         return idr_read_obj(&ib_uverbs_srq_idr, srq_handle, context, 0);
248 }
249
250 static void put_srq_read(struct ib_srq *srq)
251 {
252         put_uobj_read(srq->uobject);
253 }
254
255 ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
256                               const char __user *buf,
257                               int in_len, int out_len)
258 {
259         struct ib_uverbs_get_context      cmd;
260         struct ib_uverbs_get_context_resp resp;
261         struct ib_udata                   udata;
262         struct ib_device                 *ibdev = file->device->ib_dev;
263         struct ib_ucontext               *ucontext;
264         struct file                      *filp;
265         int ret;
266
267         if (out_len < sizeof resp)
268                 return -ENOSPC;
269
270         if (copy_from_user(&cmd, buf, sizeof cmd))
271                 return -EFAULT;
272
273         mutex_lock(&file->mutex);
274
275         if (file->ucontext) {
276                 ret = -EINVAL;
277                 goto err;
278         }
279
280         INIT_UDATA(&udata, buf + sizeof cmd,
281                    (unsigned long) cmd.response + sizeof resp,
282                    in_len - sizeof cmd, out_len - sizeof resp);
283
284         ucontext = ibdev->alloc_ucontext(ibdev, &udata);
285         if (IS_ERR(ucontext)) {
286                 ret = PTR_ERR(file->ucontext);
287                 goto err;
288         }
289
290         ucontext->device = ibdev;
291         INIT_LIST_HEAD(&ucontext->pd_list);
292         INIT_LIST_HEAD(&ucontext->mr_list);
293         INIT_LIST_HEAD(&ucontext->mw_list);
294         INIT_LIST_HEAD(&ucontext->cq_list);
295         INIT_LIST_HEAD(&ucontext->qp_list);
296         INIT_LIST_HEAD(&ucontext->srq_list);
297         INIT_LIST_HEAD(&ucontext->ah_list);
298
299         resp.num_comp_vectors = file->device->num_comp_vectors;
300
301         filp = ib_uverbs_alloc_event_file(file, 1, &resp.async_fd);
302         if (IS_ERR(filp)) {
303                 ret = PTR_ERR(filp);
304                 goto err_free;
305         }
306
307         if (copy_to_user((void __user *) (unsigned long) cmd.response,
308                          &resp, sizeof resp)) {
309                 ret = -EFAULT;
310                 goto err_file;
311         }
312
313         file->async_file = filp->private_data;
314
315         INIT_IB_EVENT_HANDLER(&file->event_handler, file->device->ib_dev,
316                               ib_uverbs_event_handler);
317         ret = ib_register_event_handler(&file->event_handler);
318         if (ret)
319                 goto err_file;
320
321         kref_get(&file->async_file->ref);
322         kref_get(&file->ref);
323         file->ucontext = ucontext;
324
325         fd_install(resp.async_fd, filp);
326
327         mutex_unlock(&file->mutex);
328
329         return in_len;
330
331 err_file:
332         put_unused_fd(resp.async_fd);
333         fput(filp);
334
335 err_free:
336         ibdev->dealloc_ucontext(ucontext);
337
338 err:
339         mutex_unlock(&file->mutex);
340         return ret;
341 }
342
343 ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
344                                const char __user *buf,
345                                int in_len, int out_len)
346 {
347         struct ib_uverbs_query_device      cmd;
348         struct ib_uverbs_query_device_resp resp;
349         struct ib_device_attr              attr;
350         int                                ret;
351
352         if (out_len < sizeof resp)
353                 return -ENOSPC;
354
355         if (copy_from_user(&cmd, buf, sizeof cmd))
356                 return -EFAULT;
357
358         ret = ib_query_device(file->device->ib_dev, &attr);
359         if (ret)
360                 return ret;
361
362         memset(&resp, 0, sizeof resp);
363
364         resp.fw_ver                    = attr.fw_ver;
365         resp.node_guid                 = file->device->ib_dev->node_guid;
366         resp.sys_image_guid            = attr.sys_image_guid;
367         resp.max_mr_size               = attr.max_mr_size;
368         resp.page_size_cap             = attr.page_size_cap;
369         resp.vendor_id                 = attr.vendor_id;
370         resp.vendor_part_id            = attr.vendor_part_id;
371         resp.hw_ver                    = attr.hw_ver;
372         resp.max_qp                    = attr.max_qp;
373         resp.max_qp_wr                 = attr.max_qp_wr;
374         resp.device_cap_flags          = attr.device_cap_flags;
375         resp.max_sge                   = attr.max_sge;
376         resp.max_sge_rd                = attr.max_sge_rd;
377         resp.max_cq                    = attr.max_cq;
378         resp.max_cqe                   = attr.max_cqe;
379         resp.max_mr                    = attr.max_mr;
380         resp.max_pd                    = attr.max_pd;
381         resp.max_qp_rd_atom            = attr.max_qp_rd_atom;
382         resp.max_ee_rd_atom            = attr.max_ee_rd_atom;
383         resp.max_res_rd_atom           = attr.max_res_rd_atom;
384         resp.max_qp_init_rd_atom       = attr.max_qp_init_rd_atom;
385         resp.max_ee_init_rd_atom       = attr.max_ee_init_rd_atom;
386         resp.atomic_cap                = attr.atomic_cap;
387         resp.max_ee                    = attr.max_ee;
388         resp.max_rdd                   = attr.max_rdd;
389         resp.max_mw                    = attr.max_mw;
390         resp.max_raw_ipv6_qp           = attr.max_raw_ipv6_qp;
391         resp.max_raw_ethy_qp           = attr.max_raw_ethy_qp;
392         resp.max_mcast_grp             = attr.max_mcast_grp;
393         resp.max_mcast_qp_attach       = attr.max_mcast_qp_attach;
394         resp.max_total_mcast_qp_attach = attr.max_total_mcast_qp_attach;
395         resp.max_ah                    = attr.max_ah;
396         resp.max_fmr                   = attr.max_fmr;
397         resp.max_map_per_fmr           = attr.max_map_per_fmr;
398         resp.max_srq                   = attr.max_srq;
399         resp.max_srq_wr                = attr.max_srq_wr;
400         resp.max_srq_sge               = attr.max_srq_sge;
401         resp.max_pkeys                 = attr.max_pkeys;
402         resp.local_ca_ack_delay        = attr.local_ca_ack_delay;
403         resp.phys_port_cnt             = file->device->ib_dev->phys_port_cnt;
404
405         if (copy_to_user((void __user *) (unsigned long) cmd.response,
406                          &resp, sizeof resp))
407                 return -EFAULT;
408
409         return in_len;
410 }
411
412 ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
413                              const char __user *buf,
414                              int in_len, int out_len)
415 {
416         struct ib_uverbs_query_port      cmd;
417         struct ib_uverbs_query_port_resp resp;
418         struct ib_port_attr              attr;
419         int                              ret;
420
421         if (out_len < sizeof resp)
422                 return -ENOSPC;
423
424         if (copy_from_user(&cmd, buf, sizeof cmd))
425                 return -EFAULT;
426
427         ret = ib_query_port(file->device->ib_dev, cmd.port_num, &attr);
428         if (ret)
429                 return ret;
430
431         memset(&resp, 0, sizeof resp);
432
433         resp.state           = attr.state;
434         resp.max_mtu         = attr.max_mtu;
435         resp.active_mtu      = attr.active_mtu;
436         resp.gid_tbl_len     = attr.gid_tbl_len;
437         resp.port_cap_flags  = attr.port_cap_flags;
438         resp.max_msg_sz      = attr.max_msg_sz;
439         resp.bad_pkey_cntr   = attr.bad_pkey_cntr;
440         resp.qkey_viol_cntr  = attr.qkey_viol_cntr;
441         resp.pkey_tbl_len    = attr.pkey_tbl_len;
442         resp.lid             = attr.lid;
443         resp.sm_lid          = attr.sm_lid;
444         resp.lmc             = attr.lmc;
445         resp.max_vl_num      = attr.max_vl_num;
446         resp.sm_sl           = attr.sm_sl;
447         resp.subnet_timeout  = attr.subnet_timeout;
448         resp.init_type_reply = attr.init_type_reply;
449         resp.active_width    = attr.active_width;
450         resp.active_speed    = attr.active_speed;
451         resp.phys_state      = attr.phys_state;
452
453         if (copy_to_user((void __user *) (unsigned long) cmd.response,
454                          &resp, sizeof resp))
455                 return -EFAULT;
456
457         return in_len;
458 }
459
460 ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
461                            const char __user *buf,
462                            int in_len, int out_len)
463 {
464         struct ib_uverbs_alloc_pd      cmd;
465         struct ib_uverbs_alloc_pd_resp resp;
466         struct ib_udata                udata;
467         struct ib_uobject             *uobj;
468         struct ib_pd                  *pd;
469         int                            ret;
470
471         if (out_len < sizeof resp)
472                 return -ENOSPC;
473
474         if (copy_from_user(&cmd, buf, sizeof cmd))
475                 return -EFAULT;
476
477         INIT_UDATA(&udata, buf + sizeof cmd,
478                    (unsigned long) cmd.response + sizeof resp,
479                    in_len - sizeof cmd, out_len - sizeof resp);
480
481         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
482         if (!uobj)
483                 return -ENOMEM;
484
485         init_uobj(uobj, 0, file->ucontext, &pd_lock_key);
486         down_write(&uobj->mutex);
487
488         pd = file->device->ib_dev->alloc_pd(file->device->ib_dev,
489                                             file->ucontext, &udata);
490         if (IS_ERR(pd)) {
491                 ret = PTR_ERR(pd);
492                 goto err;
493         }
494
495         pd->device  = file->device->ib_dev;
496         pd->uobject = uobj;
497         atomic_set(&pd->usecnt, 0);
498
499         uobj->object = pd;
500         ret = idr_add_uobj(&ib_uverbs_pd_idr, uobj);
501         if (ret)
502                 goto err_idr;
503
504         memset(&resp, 0, sizeof resp);
505         resp.pd_handle = uobj->id;
506
507         if (copy_to_user((void __user *) (unsigned long) cmd.response,
508                          &resp, sizeof resp)) {
509                 ret = -EFAULT;
510                 goto err_copy;
511         }
512
513         mutex_lock(&file->mutex);
514         list_add_tail(&uobj->list, &file->ucontext->pd_list);
515         mutex_unlock(&file->mutex);
516
517         uobj->live = 1;
518
519         up_write(&uobj->mutex);
520
521         return in_len;
522
523 err_copy:
524         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
525
526 err_idr:
527         ib_dealloc_pd(pd);
528
529 err:
530         put_uobj_write(uobj);
531         return ret;
532 }
533
534 ssize_t ib_uverbs_dealloc_pd(struct ib_uverbs_file *file,
535                              const char __user *buf,
536                              int in_len, int out_len)
537 {
538         struct ib_uverbs_dealloc_pd cmd;
539         struct ib_uobject          *uobj;
540         int                         ret;
541
542         if (copy_from_user(&cmd, buf, sizeof cmd))
543                 return -EFAULT;
544
545         uobj = idr_write_uobj(&ib_uverbs_pd_idr, cmd.pd_handle, file->ucontext);
546         if (!uobj)
547                 return -EINVAL;
548
549         ret = ib_dealloc_pd(uobj->object);
550         if (!ret)
551                 uobj->live = 0;
552
553         put_uobj_write(uobj);
554
555         if (ret)
556                 return ret;
557
558         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
559
560         mutex_lock(&file->mutex);
561         list_del(&uobj->list);
562         mutex_unlock(&file->mutex);
563
564         put_uobj(uobj);
565
566         return in_len;
567 }
568
569 ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
570                          const char __user *buf, int in_len,
571                          int out_len)
572 {
573         struct ib_uverbs_reg_mr      cmd;
574         struct ib_uverbs_reg_mr_resp resp;
575         struct ib_udata              udata;
576         struct ib_umem_object       *obj;
577         struct ib_pd                *pd;
578         struct ib_mr                *mr;
579         int                          ret;
580
581         if (out_len < sizeof resp)
582                 return -ENOSPC;
583
584         if (copy_from_user(&cmd, buf, sizeof cmd))
585                 return -EFAULT;
586
587         INIT_UDATA(&udata, buf + sizeof cmd,
588                    (unsigned long) cmd.response + sizeof resp,
589                    in_len - sizeof cmd, out_len - sizeof resp);
590
591         if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))
592                 return -EINVAL;
593
594         /*
595          * Local write permission is required if remote write or
596          * remote atomic permission is also requested.
597          */
598         if (cmd.access_flags & (IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_REMOTE_WRITE) &&
599             !(cmd.access_flags & IB_ACCESS_LOCAL_WRITE))
600                 return -EINVAL;
601
602         obj = kmalloc(sizeof *obj, GFP_KERNEL);
603         if (!obj)
604                 return -ENOMEM;
605
606         init_uobj(&obj->uobject, 0, file->ucontext, &mr_lock_key);
607         down_write(&obj->uobject.mutex);
608
609         /*
610          * We ask for writable memory if any access flags other than
611          * "remote read" are set.  "Local write" and "remote write"
612          * obviously require write access.  "Remote atomic" can do
613          * things like fetch and add, which will modify memory, and
614          * "MW bind" can change permissions by binding a window.
615          */
616         ret = ib_umem_get(file->device->ib_dev, &obj->umem,
617                           (void *) (unsigned long) cmd.start, cmd.length,
618                           !!(cmd.access_flags & ~IB_ACCESS_REMOTE_READ));
619         if (ret)
620                 goto err_free;
621
622         obj->umem.virt_base = cmd.hca_va;
623
624         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
625         if (!pd) {
626                 ret = -EINVAL;
627                 goto err_release;
628         }
629
630         mr = pd->device->reg_user_mr(pd, &obj->umem, cmd.access_flags, &udata);
631         if (IS_ERR(mr)) {
632                 ret = PTR_ERR(mr);
633                 goto err_put;
634         }
635
636         mr->device  = pd->device;
637         mr->pd      = pd;
638         mr->uobject = &obj->uobject;
639         atomic_inc(&pd->usecnt);
640         atomic_set(&mr->usecnt, 0);
641
642         obj->uobject.object = mr;
643         ret = idr_add_uobj(&ib_uverbs_mr_idr, &obj->uobject);
644         if (ret)
645                 goto err_unreg;
646
647         memset(&resp, 0, sizeof resp);
648         resp.lkey      = mr->lkey;
649         resp.rkey      = mr->rkey;
650         resp.mr_handle = obj->uobject.id;
651
652         if (copy_to_user((void __user *) (unsigned long) cmd.response,
653                          &resp, sizeof resp)) {
654                 ret = -EFAULT;
655                 goto err_copy;
656         }
657
658         put_pd_read(pd);
659
660         mutex_lock(&file->mutex);
661         list_add_tail(&obj->uobject.list, &file->ucontext->mr_list);
662         mutex_unlock(&file->mutex);
663
664         obj->uobject.live = 1;
665
666         up_write(&obj->uobject.mutex);
667
668         return in_len;
669
670 err_copy:
671         idr_remove_uobj(&ib_uverbs_mr_idr, &obj->uobject);
672
673 err_unreg:
674         ib_dereg_mr(mr);
675
676 err_put:
677         put_pd_read(pd);
678
679 err_release:
680         ib_umem_release(file->device->ib_dev, &obj->umem);
681
682 err_free:
683         put_uobj_write(&obj->uobject);
684         return ret;
685 }
686
687 ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
688                            const char __user *buf, int in_len,
689                            int out_len)
690 {
691         struct ib_uverbs_dereg_mr cmd;
692         struct ib_mr             *mr;
693         struct ib_uobject        *uobj;
694         struct ib_umem_object    *memobj;
695         int                       ret = -EINVAL;
696
697         if (copy_from_user(&cmd, buf, sizeof cmd))
698                 return -EFAULT;
699
700         uobj = idr_write_uobj(&ib_uverbs_mr_idr, cmd.mr_handle, file->ucontext);
701         if (!uobj)
702                 return -EINVAL;
703
704         memobj = container_of(uobj, struct ib_umem_object, uobject);
705         mr     = uobj->object;
706
707         ret = ib_dereg_mr(mr);
708         if (!ret)
709                 uobj->live = 0;
710
711         put_uobj_write(uobj);
712
713         if (ret)
714                 return ret;
715
716         idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
717
718         mutex_lock(&file->mutex);
719         list_del(&uobj->list);
720         mutex_unlock(&file->mutex);
721
722         ib_umem_release(file->device->ib_dev, &memobj->umem);
723
724         put_uobj(uobj);
725
726         return in_len;
727 }
728
729 ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
730                                       const char __user *buf, int in_len,
731                                       int out_len)
732 {
733         struct ib_uverbs_create_comp_channel       cmd;
734         struct ib_uverbs_create_comp_channel_resp  resp;
735         struct file                               *filp;
736
737         if (out_len < sizeof resp)
738                 return -ENOSPC;
739
740         if (copy_from_user(&cmd, buf, sizeof cmd))
741                 return -EFAULT;
742
743         filp = ib_uverbs_alloc_event_file(file, 0, &resp.fd);
744         if (IS_ERR(filp))
745                 return PTR_ERR(filp);
746
747         if (copy_to_user((void __user *) (unsigned long) cmd.response,
748                          &resp, sizeof resp)) {
749                 put_unused_fd(resp.fd);
750                 fput(filp);
751                 return -EFAULT;
752         }
753
754         fd_install(resp.fd, filp);
755         return in_len;
756 }
757
758 ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
759                             const char __user *buf, int in_len,
760                             int out_len)
761 {
762         struct ib_uverbs_create_cq      cmd;
763         struct ib_uverbs_create_cq_resp resp;
764         struct ib_udata                 udata;
765         struct ib_ucq_object           *obj;
766         struct ib_uverbs_event_file    *ev_file = NULL;
767         struct ib_cq                   *cq;
768         int                             ret;
769
770         if (out_len < sizeof resp)
771                 return -ENOSPC;
772
773         if (copy_from_user(&cmd, buf, sizeof cmd))
774                 return -EFAULT;
775
776         INIT_UDATA(&udata, buf + sizeof cmd,
777                    (unsigned long) cmd.response + sizeof resp,
778                    in_len - sizeof cmd, out_len - sizeof resp);
779
780         if (cmd.comp_vector >= file->device->num_comp_vectors)
781                 return -EINVAL;
782
783         obj = kmalloc(sizeof *obj, GFP_KERNEL);
784         if (!obj)
785                 return -ENOMEM;
786
787         init_uobj(&obj->uobject, cmd.user_handle, file->ucontext, &cq_lock_key);
788         down_write(&obj->uobject.mutex);
789
790         if (cmd.comp_channel >= 0) {
791                 ev_file = ib_uverbs_lookup_comp_file(cmd.comp_channel);
792                 if (!ev_file) {
793                         ret = -EINVAL;
794                         goto err;
795                 }
796         }
797
798         obj->uverbs_file           = file;
799         obj->comp_events_reported  = 0;
800         obj->async_events_reported = 0;
801         INIT_LIST_HEAD(&obj->comp_list);
802         INIT_LIST_HEAD(&obj->async_list);
803
804         cq = file->device->ib_dev->create_cq(file->device->ib_dev, cmd.cqe,
805                                              file->ucontext, &udata);
806         if (IS_ERR(cq)) {
807                 ret = PTR_ERR(cq);
808                 goto err_file;
809         }
810
811         cq->device        = file->device->ib_dev;
812         cq->uobject       = &obj->uobject;
813         cq->comp_handler  = ib_uverbs_comp_handler;
814         cq->event_handler = ib_uverbs_cq_event_handler;
815         cq->cq_context    = ev_file;
816         atomic_set(&cq->usecnt, 0);
817
818         obj->uobject.object = cq;
819         ret = idr_add_uobj(&ib_uverbs_cq_idr, &obj->uobject);
820         if (ret)
821                 goto err_free;
822
823         memset(&resp, 0, sizeof resp);
824         resp.cq_handle = obj->uobject.id;
825         resp.cqe       = cq->cqe;
826
827         if (copy_to_user((void __user *) (unsigned long) cmd.response,
828                          &resp, sizeof resp)) {
829                 ret = -EFAULT;
830                 goto err_copy;
831         }
832
833         mutex_lock(&file->mutex);
834         list_add_tail(&obj->uobject.list, &file->ucontext->cq_list);
835         mutex_unlock(&file->mutex);
836
837         obj->uobject.live = 1;
838
839         up_write(&obj->uobject.mutex);
840
841         return in_len;
842
843 err_copy:
844         idr_remove_uobj(&ib_uverbs_cq_idr, &obj->uobject);
845
846 err_free:
847         ib_destroy_cq(cq);
848
849 err_file:
850         if (ev_file)
851                 ib_uverbs_release_ucq(file, ev_file, obj);
852
853 err:
854         put_uobj_write(&obj->uobject);
855         return ret;
856 }
857
858 ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
859                             const char __user *buf, int in_len,
860                             int out_len)
861 {
862         struct ib_uverbs_resize_cq      cmd;
863         struct ib_uverbs_resize_cq_resp resp;
864         struct ib_udata                 udata;
865         struct ib_cq                    *cq;
866         int                             ret = -EINVAL;
867
868         if (copy_from_user(&cmd, buf, sizeof cmd))
869                 return -EFAULT;
870
871         INIT_UDATA(&udata, buf + sizeof cmd,
872                    (unsigned long) cmd.response + sizeof resp,
873                    in_len - sizeof cmd, out_len - sizeof resp);
874
875         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
876         if (!cq)
877                 return -EINVAL;
878
879         ret = cq->device->resize_cq(cq, cmd.cqe, &udata);
880         if (ret)
881                 goto out;
882
883         resp.cqe = cq->cqe;
884
885         if (copy_to_user((void __user *) (unsigned long) cmd.response,
886                          &resp, sizeof resp.cqe))
887                 ret = -EFAULT;
888
889 out:
890         put_cq_read(cq);
891
892         return ret ? ret : in_len;
893 }
894
895 ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
896                           const char __user *buf, int in_len,
897                           int out_len)
898 {
899         struct ib_uverbs_poll_cq       cmd;
900         struct ib_uverbs_poll_cq_resp *resp;
901         struct ib_cq                  *cq;
902         struct ib_wc                  *wc;
903         int                            ret = 0;
904         int                            i;
905         int                            rsize;
906
907         if (copy_from_user(&cmd, buf, sizeof cmd))
908                 return -EFAULT;
909
910         wc = kmalloc(cmd.ne * sizeof *wc, GFP_KERNEL);
911         if (!wc)
912                 return -ENOMEM;
913
914         rsize = sizeof *resp + cmd.ne * sizeof(struct ib_uverbs_wc);
915         resp = kmalloc(rsize, GFP_KERNEL);
916         if (!resp) {
917                 ret = -ENOMEM;
918                 goto out_wc;
919         }
920
921         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
922         if (!cq) {
923                 ret = -EINVAL;
924                 goto out;
925         }
926
927         resp->count = ib_poll_cq(cq, cmd.ne, wc);
928
929         put_cq_read(cq);
930
931         for (i = 0; i < resp->count; i++) {
932                 resp->wc[i].wr_id          = wc[i].wr_id;
933                 resp->wc[i].status         = wc[i].status;
934                 resp->wc[i].opcode         = wc[i].opcode;
935                 resp->wc[i].vendor_err     = wc[i].vendor_err;
936                 resp->wc[i].byte_len       = wc[i].byte_len;
937                 resp->wc[i].imm_data       = (__u32 __force) wc[i].imm_data;
938                 resp->wc[i].qp_num         = wc[i].qp->qp_num;
939                 resp->wc[i].src_qp         = wc[i].src_qp;
940                 resp->wc[i].wc_flags       = wc[i].wc_flags;
941                 resp->wc[i].pkey_index     = wc[i].pkey_index;
942                 resp->wc[i].slid           = wc[i].slid;
943                 resp->wc[i].sl             = wc[i].sl;
944                 resp->wc[i].dlid_path_bits = wc[i].dlid_path_bits;
945                 resp->wc[i].port_num       = wc[i].port_num;
946         }
947
948         if (copy_to_user((void __user *) (unsigned long) cmd.response, resp, rsize))
949                 ret = -EFAULT;
950
951 out:
952         kfree(resp);
953
954 out_wc:
955         kfree(wc);
956         return ret ? ret : in_len;
957 }
958
959 ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file,
960                                 const char __user *buf, int in_len,
961                                 int out_len)
962 {
963         struct ib_uverbs_req_notify_cq cmd;
964         struct ib_cq                  *cq;
965
966         if (copy_from_user(&cmd, buf, sizeof cmd))
967                 return -EFAULT;
968
969         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
970         if (!cq)
971                 return -EINVAL;
972
973         ib_req_notify_cq(cq, cmd.solicited_only ?
974                          IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
975
976         put_cq_read(cq);
977
978         return in_len;
979 }
980
981 ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
982                              const char __user *buf, int in_len,
983                              int out_len)
984 {
985         struct ib_uverbs_destroy_cq      cmd;
986         struct ib_uverbs_destroy_cq_resp resp;
987         struct ib_uobject               *uobj;
988         struct ib_cq                    *cq;
989         struct ib_ucq_object            *obj;
990         struct ib_uverbs_event_file     *ev_file;
991         int                              ret = -EINVAL;
992
993         if (copy_from_user(&cmd, buf, sizeof cmd))
994                 return -EFAULT;
995
996         uobj = idr_write_uobj(&ib_uverbs_cq_idr, cmd.cq_handle, file->ucontext);
997         if (!uobj)
998                 return -EINVAL;
999         cq      = uobj->object;
1000         ev_file = cq->cq_context;
1001         obj     = container_of(cq->uobject, struct ib_ucq_object, uobject);
1002
1003         ret = ib_destroy_cq(cq);
1004         if (!ret)
1005                 uobj->live = 0;
1006
1007         put_uobj_write(uobj);
1008
1009         if (ret)
1010                 return ret;
1011
1012         idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
1013
1014         mutex_lock(&file->mutex);
1015         list_del(&uobj->list);
1016         mutex_unlock(&file->mutex);
1017
1018         ib_uverbs_release_ucq(file, ev_file, obj);
1019
1020         memset(&resp, 0, sizeof resp);
1021         resp.comp_events_reported  = obj->comp_events_reported;
1022         resp.async_events_reported = obj->async_events_reported;
1023
1024         put_uobj(uobj);
1025
1026         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1027                          &resp, sizeof resp))
1028                 return -EFAULT;
1029
1030         return in_len;
1031 }
1032
1033 ssize_t ib_uverbs_create_qp(struct ib_uverbs_file *file,
1034                             const char __user *buf, int in_len,
1035                             int out_len)
1036 {
1037         struct ib_uverbs_create_qp      cmd;
1038         struct ib_uverbs_create_qp_resp resp;
1039         struct ib_udata                 udata;
1040         struct ib_uqp_object           *obj;
1041         struct ib_pd                   *pd;
1042         struct ib_cq                   *scq, *rcq;
1043         struct ib_srq                  *srq;
1044         struct ib_qp                   *qp;
1045         struct ib_qp_init_attr          attr;
1046         int ret;
1047
1048         if (out_len < sizeof resp)
1049                 return -ENOSPC;
1050
1051         if (copy_from_user(&cmd, buf, sizeof cmd))
1052                 return -EFAULT;
1053
1054         INIT_UDATA(&udata, buf + sizeof cmd,
1055                    (unsigned long) cmd.response + sizeof resp,
1056                    in_len - sizeof cmd, out_len - sizeof resp);
1057
1058         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1059         if (!obj)
1060                 return -ENOMEM;
1061
1062         init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_key);
1063         down_write(&obj->uevent.uobject.mutex);
1064
1065         srq = cmd.is_srq ? idr_read_srq(cmd.srq_handle, file->ucontext) : NULL;
1066         pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
1067         scq = idr_read_cq(cmd.send_cq_handle, file->ucontext, 0);
1068         rcq = cmd.recv_cq_handle == cmd.send_cq_handle ?
1069                 scq : idr_read_cq(cmd.recv_cq_handle, file->ucontext, 1);
1070
1071         if (!pd || !scq || !rcq || (cmd.is_srq && !srq)) {
1072                 ret = -EINVAL;
1073                 goto err_put;
1074         }
1075
1076         attr.event_handler = ib_uverbs_qp_event_handler;
1077         attr.qp_context    = file;
1078         attr.send_cq       = scq;
1079         attr.recv_cq       = rcq;
1080         attr.srq           = srq;
1081         attr.sq_sig_type   = cmd.sq_sig_all ? IB_SIGNAL_ALL_WR : IB_SIGNAL_REQ_WR;
1082         attr.qp_type       = cmd.qp_type;
1083
1084         attr.cap.max_send_wr     = cmd.max_send_wr;
1085         attr.cap.max_recv_wr     = cmd.max_recv_wr;
1086         attr.cap.max_send_sge    = cmd.max_send_sge;
1087         attr.cap.max_recv_sge    = cmd.max_recv_sge;
1088         attr.cap.max_inline_data = cmd.max_inline_data;
1089
1090         obj->uevent.events_reported     = 0;
1091         INIT_LIST_HEAD(&obj->uevent.event_list);
1092         INIT_LIST_HEAD(&obj->mcast_list);
1093
1094         qp = pd->device->create_qp(pd, &attr, &udata);
1095         if (IS_ERR(qp)) {
1096                 ret = PTR_ERR(qp);
1097                 goto err_put;
1098         }
1099
1100         qp->device        = pd->device;
1101         qp->pd            = pd;
1102         qp->send_cq       = attr.send_cq;
1103         qp->recv_cq       = attr.recv_cq;
1104         qp->srq           = attr.srq;
1105         qp->uobject       = &obj->uevent.uobject;
1106         qp->event_handler = attr.event_handler;
1107         qp->qp_context    = attr.qp_context;
1108         qp->qp_type       = attr.qp_type;
1109         atomic_inc(&pd->usecnt);
1110         atomic_inc(&attr.send_cq->usecnt);
1111         atomic_inc(&attr.recv_cq->usecnt);
1112         if (attr.srq)
1113                 atomic_inc(&attr.srq->usecnt);
1114
1115         obj->uevent.uobject.object = qp;
1116         ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1117         if (ret)
1118                 goto err_destroy;
1119
1120         memset(&resp, 0, sizeof resp);
1121         resp.qpn             = qp->qp_num;
1122         resp.qp_handle       = obj->uevent.uobject.id;
1123         resp.max_recv_sge    = attr.cap.max_recv_sge;
1124         resp.max_send_sge    = attr.cap.max_send_sge;
1125         resp.max_recv_wr     = attr.cap.max_recv_wr;
1126         resp.max_send_wr     = attr.cap.max_send_wr;
1127         resp.max_inline_data = attr.cap.max_inline_data;
1128
1129         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1130                          &resp, sizeof resp)) {
1131                 ret = -EFAULT;
1132                 goto err_copy;
1133         }
1134
1135         put_pd_read(pd);
1136         put_cq_read(scq);
1137         if (rcq != scq)
1138                 put_cq_read(rcq);
1139         if (srq)
1140                 put_srq_read(srq);
1141
1142         mutex_lock(&file->mutex);
1143         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1144         mutex_unlock(&file->mutex);
1145
1146         obj->uevent.uobject.live = 1;
1147
1148         up_write(&obj->uevent.uobject.mutex);
1149
1150         return in_len;
1151
1152 err_copy:
1153         idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1154
1155 err_destroy:
1156         ib_destroy_qp(qp);
1157
1158 err_put:
1159         if (pd)
1160                 put_pd_read(pd);
1161         if (scq)
1162                 put_cq_read(scq);
1163         if (rcq && rcq != scq)
1164                 put_cq_read(rcq);
1165         if (srq)
1166                 put_srq_read(srq);
1167
1168         put_uobj_write(&obj->uevent.uobject);
1169         return ret;
1170 }
1171
1172 ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
1173                            const char __user *buf, int in_len,
1174                            int out_len)
1175 {
1176         struct ib_uverbs_query_qp      cmd;
1177         struct ib_uverbs_query_qp_resp resp;
1178         struct ib_qp                   *qp;
1179         struct ib_qp_attr              *attr;
1180         struct ib_qp_init_attr         *init_attr;
1181         int                            ret;
1182
1183         if (copy_from_user(&cmd, buf, sizeof cmd))
1184                 return -EFAULT;
1185
1186         attr      = kmalloc(sizeof *attr, GFP_KERNEL);
1187         init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
1188         if (!attr || !init_attr) {
1189                 ret = -ENOMEM;
1190                 goto out;
1191         }
1192
1193         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1194         if (!qp) {
1195                 ret = -EINVAL;
1196                 goto out;
1197         }
1198
1199         ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
1200
1201         put_qp_read(qp);
1202
1203         if (ret)
1204                 goto out;
1205
1206         memset(&resp, 0, sizeof resp);
1207
1208         resp.qp_state               = attr->qp_state;
1209         resp.cur_qp_state           = attr->cur_qp_state;
1210         resp.path_mtu               = attr->path_mtu;
1211         resp.path_mig_state         = attr->path_mig_state;
1212         resp.qkey                   = attr->qkey;
1213         resp.rq_psn                 = attr->rq_psn;
1214         resp.sq_psn                 = attr->sq_psn;
1215         resp.dest_qp_num            = attr->dest_qp_num;
1216         resp.qp_access_flags        = attr->qp_access_flags;
1217         resp.pkey_index             = attr->pkey_index;
1218         resp.alt_pkey_index         = attr->alt_pkey_index;
1219         resp.sq_draining            = attr->sq_draining;
1220         resp.max_rd_atomic          = attr->max_rd_atomic;
1221         resp.max_dest_rd_atomic     = attr->max_dest_rd_atomic;
1222         resp.min_rnr_timer          = attr->min_rnr_timer;
1223         resp.port_num               = attr->port_num;
1224         resp.timeout                = attr->timeout;
1225         resp.retry_cnt              = attr->retry_cnt;
1226         resp.rnr_retry              = attr->rnr_retry;
1227         resp.alt_port_num           = attr->alt_port_num;
1228         resp.alt_timeout            = attr->alt_timeout;
1229
1230         memcpy(resp.dest.dgid, attr->ah_attr.grh.dgid.raw, 16);
1231         resp.dest.flow_label        = attr->ah_attr.grh.flow_label;
1232         resp.dest.sgid_index        = attr->ah_attr.grh.sgid_index;
1233         resp.dest.hop_limit         = attr->ah_attr.grh.hop_limit;
1234         resp.dest.traffic_class     = attr->ah_attr.grh.traffic_class;
1235         resp.dest.dlid              = attr->ah_attr.dlid;
1236         resp.dest.sl                = attr->ah_attr.sl;
1237         resp.dest.src_path_bits     = attr->ah_attr.src_path_bits;
1238         resp.dest.static_rate       = attr->ah_attr.static_rate;
1239         resp.dest.is_global         = !!(attr->ah_attr.ah_flags & IB_AH_GRH);
1240         resp.dest.port_num          = attr->ah_attr.port_num;
1241
1242         memcpy(resp.alt_dest.dgid, attr->alt_ah_attr.grh.dgid.raw, 16);
1243         resp.alt_dest.flow_label    = attr->alt_ah_attr.grh.flow_label;
1244         resp.alt_dest.sgid_index    = attr->alt_ah_attr.grh.sgid_index;
1245         resp.alt_dest.hop_limit     = attr->alt_ah_attr.grh.hop_limit;
1246         resp.alt_dest.traffic_class = attr->alt_ah_attr.grh.traffic_class;
1247         resp.alt_dest.dlid          = attr->alt_ah_attr.dlid;
1248         resp.alt_dest.sl            = attr->alt_ah_attr.sl;
1249         resp.alt_dest.src_path_bits = attr->alt_ah_attr.src_path_bits;
1250         resp.alt_dest.static_rate   = attr->alt_ah_attr.static_rate;
1251         resp.alt_dest.is_global     = !!(attr->alt_ah_attr.ah_flags & IB_AH_GRH);
1252         resp.alt_dest.port_num      = attr->alt_ah_attr.port_num;
1253
1254         resp.max_send_wr            = init_attr->cap.max_send_wr;
1255         resp.max_recv_wr            = init_attr->cap.max_recv_wr;
1256         resp.max_send_sge           = init_attr->cap.max_send_sge;
1257         resp.max_recv_sge           = init_attr->cap.max_recv_sge;
1258         resp.max_inline_data        = init_attr->cap.max_inline_data;
1259         resp.sq_sig_all             = init_attr->sq_sig_type == IB_SIGNAL_ALL_WR;
1260
1261         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1262                          &resp, sizeof resp))
1263                 ret = -EFAULT;
1264
1265 out:
1266         kfree(attr);
1267         kfree(init_attr);
1268
1269         return ret ? ret : in_len;
1270 }
1271
1272 ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file,
1273                             const char __user *buf, int in_len,
1274                             int out_len)
1275 {
1276         struct ib_uverbs_modify_qp cmd;
1277         struct ib_udata            udata;
1278         struct ib_qp              *qp;
1279         struct ib_qp_attr         *attr;
1280         int                        ret;
1281
1282         if (copy_from_user(&cmd, buf, sizeof cmd))
1283                 return -EFAULT;
1284
1285         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
1286                    out_len);
1287
1288         attr = kmalloc(sizeof *attr, GFP_KERNEL);
1289         if (!attr)
1290                 return -ENOMEM;
1291
1292         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1293         if (!qp) {
1294                 ret = -EINVAL;
1295                 goto out;
1296         }
1297
1298         attr->qp_state            = cmd.qp_state;
1299         attr->cur_qp_state        = cmd.cur_qp_state;
1300         attr->path_mtu            = cmd.path_mtu;
1301         attr->path_mig_state      = cmd.path_mig_state;
1302         attr->qkey                = cmd.qkey;
1303         attr->rq_psn              = cmd.rq_psn;
1304         attr->sq_psn              = cmd.sq_psn;
1305         attr->dest_qp_num         = cmd.dest_qp_num;
1306         attr->qp_access_flags     = cmd.qp_access_flags;
1307         attr->pkey_index          = cmd.pkey_index;
1308         attr->alt_pkey_index      = cmd.alt_pkey_index;
1309         attr->en_sqd_async_notify = cmd.en_sqd_async_notify;
1310         attr->max_rd_atomic       = cmd.max_rd_atomic;
1311         attr->max_dest_rd_atomic  = cmd.max_dest_rd_atomic;
1312         attr->min_rnr_timer       = cmd.min_rnr_timer;
1313         attr->port_num            = cmd.port_num;
1314         attr->timeout             = cmd.timeout;
1315         attr->retry_cnt           = cmd.retry_cnt;
1316         attr->rnr_retry           = cmd.rnr_retry;
1317         attr->alt_port_num        = cmd.alt_port_num;
1318         attr->alt_timeout         = cmd.alt_timeout;
1319
1320         memcpy(attr->ah_attr.grh.dgid.raw, cmd.dest.dgid, 16);
1321         attr->ah_attr.grh.flow_label        = cmd.dest.flow_label;
1322         attr->ah_attr.grh.sgid_index        = cmd.dest.sgid_index;
1323         attr->ah_attr.grh.hop_limit         = cmd.dest.hop_limit;
1324         attr->ah_attr.grh.traffic_class     = cmd.dest.traffic_class;
1325         attr->ah_attr.dlid                  = cmd.dest.dlid;
1326         attr->ah_attr.sl                    = cmd.dest.sl;
1327         attr->ah_attr.src_path_bits         = cmd.dest.src_path_bits;
1328         attr->ah_attr.static_rate           = cmd.dest.static_rate;
1329         attr->ah_attr.ah_flags              = cmd.dest.is_global ? IB_AH_GRH : 0;
1330         attr->ah_attr.port_num              = cmd.dest.port_num;
1331
1332         memcpy(attr->alt_ah_attr.grh.dgid.raw, cmd.alt_dest.dgid, 16);
1333         attr->alt_ah_attr.grh.flow_label    = cmd.alt_dest.flow_label;
1334         attr->alt_ah_attr.grh.sgid_index    = cmd.alt_dest.sgid_index;
1335         attr->alt_ah_attr.grh.hop_limit     = cmd.alt_dest.hop_limit;
1336         attr->alt_ah_attr.grh.traffic_class = cmd.alt_dest.traffic_class;
1337         attr->alt_ah_attr.dlid              = cmd.alt_dest.dlid;
1338         attr->alt_ah_attr.sl                = cmd.alt_dest.sl;
1339         attr->alt_ah_attr.src_path_bits     = cmd.alt_dest.src_path_bits;
1340         attr->alt_ah_attr.static_rate       = cmd.alt_dest.static_rate;
1341         attr->alt_ah_attr.ah_flags          = cmd.alt_dest.is_global ? IB_AH_GRH : 0;
1342         attr->alt_ah_attr.port_num          = cmd.alt_dest.port_num;
1343
1344         ret = qp->device->modify_qp(qp, attr, cmd.attr_mask, &udata);
1345
1346         put_qp_read(qp);
1347
1348         if (ret)
1349                 goto out;
1350
1351         ret = in_len;
1352
1353 out:
1354         kfree(attr);
1355
1356         return ret;
1357 }
1358
1359 ssize_t ib_uverbs_destroy_qp(struct ib_uverbs_file *file,
1360                              const char __user *buf, int in_len,
1361                              int out_len)
1362 {
1363         struct ib_uverbs_destroy_qp      cmd;
1364         struct ib_uverbs_destroy_qp_resp resp;
1365         struct ib_uobject               *uobj;
1366         struct ib_qp                    *qp;
1367         struct ib_uqp_object            *obj;
1368         int                              ret = -EINVAL;
1369
1370         if (copy_from_user(&cmd, buf, sizeof cmd))
1371                 return -EFAULT;
1372
1373         memset(&resp, 0, sizeof resp);
1374
1375         uobj = idr_write_uobj(&ib_uverbs_qp_idr, cmd.qp_handle, file->ucontext);
1376         if (!uobj)
1377                 return -EINVAL;
1378         qp  = uobj->object;
1379         obj = container_of(uobj, struct ib_uqp_object, uevent.uobject);
1380
1381         if (!list_empty(&obj->mcast_list)) {
1382                 put_uobj_write(uobj);
1383                 return -EBUSY;
1384         }
1385
1386         ret = ib_destroy_qp(qp);
1387         if (!ret)
1388                 uobj->live = 0;
1389
1390         put_uobj_write(uobj);
1391
1392         if (ret)
1393                 return ret;
1394
1395         idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
1396
1397         mutex_lock(&file->mutex);
1398         list_del(&uobj->list);
1399         mutex_unlock(&file->mutex);
1400
1401         ib_uverbs_release_uevent(file, &obj->uevent);
1402
1403         resp.events_reported = obj->uevent.events_reported;
1404
1405         put_uobj(uobj);
1406
1407         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1408                          &resp, sizeof resp))
1409                 return -EFAULT;
1410
1411         return in_len;
1412 }
1413
1414 ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
1415                             const char __user *buf, int in_len,
1416                             int out_len)
1417 {
1418         struct ib_uverbs_post_send      cmd;
1419         struct ib_uverbs_post_send_resp resp;
1420         struct ib_uverbs_send_wr       *user_wr;
1421         struct ib_send_wr              *wr = NULL, *last, *next, *bad_wr;
1422         struct ib_qp                   *qp;
1423         int                             i, sg_ind;
1424         int                             is_ud;
1425         ssize_t                         ret = -EINVAL;
1426
1427         if (copy_from_user(&cmd, buf, sizeof cmd))
1428                 return -EFAULT;
1429
1430         if (in_len < sizeof cmd + cmd.wqe_size * cmd.wr_count +
1431             cmd.sge_count * sizeof (struct ib_uverbs_sge))
1432                 return -EINVAL;
1433
1434         if (cmd.wqe_size < sizeof (struct ib_uverbs_send_wr))
1435                 return -EINVAL;
1436
1437         user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL);
1438         if (!user_wr)
1439                 return -ENOMEM;
1440
1441         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1442         if (!qp)
1443                 goto out;
1444
1445         is_ud = qp->qp_type == IB_QPT_UD;
1446         sg_ind = 0;
1447         last = NULL;
1448         for (i = 0; i < cmd.wr_count; ++i) {
1449                 if (copy_from_user(user_wr,
1450                                    buf + sizeof cmd + i * cmd.wqe_size,
1451                                    cmd.wqe_size)) {
1452                         ret = -EFAULT;
1453                         goto out_put;
1454                 }
1455
1456                 if (user_wr->num_sge + sg_ind > cmd.sge_count) {
1457                         ret = -EINVAL;
1458                         goto out_put;
1459                 }
1460
1461                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
1462                                user_wr->num_sge * sizeof (struct ib_sge),
1463                                GFP_KERNEL);
1464                 if (!next) {
1465                         ret = -ENOMEM;
1466                         goto out_put;
1467                 }
1468
1469                 if (!last)
1470                         wr = next;
1471                 else
1472                         last->next = next;
1473                 last = next;
1474
1475                 next->next       = NULL;
1476                 next->wr_id      = user_wr->wr_id;
1477                 next->num_sge    = user_wr->num_sge;
1478                 next->opcode     = user_wr->opcode;
1479                 next->send_flags = user_wr->send_flags;
1480                 next->imm_data   = (__be32 __force) user_wr->imm_data;
1481
1482                 if (is_ud) {
1483                         next->wr.ud.ah = idr_read_ah(user_wr->wr.ud.ah,
1484                                                      file->ucontext);
1485                         if (!next->wr.ud.ah) {
1486                                 ret = -EINVAL;
1487                                 goto out_put;
1488                         }
1489                         next->wr.ud.remote_qpn  = user_wr->wr.ud.remote_qpn;
1490                         next->wr.ud.remote_qkey = user_wr->wr.ud.remote_qkey;
1491                 } else {
1492                         switch (next->opcode) {
1493                         case IB_WR_RDMA_WRITE:
1494                         case IB_WR_RDMA_WRITE_WITH_IMM:
1495                         case IB_WR_RDMA_READ:
1496                                 next->wr.rdma.remote_addr =
1497                                         user_wr->wr.rdma.remote_addr;
1498                                 next->wr.rdma.rkey        =
1499                                         user_wr->wr.rdma.rkey;
1500                                 break;
1501                         case IB_WR_ATOMIC_CMP_AND_SWP:
1502                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1503                                 next->wr.atomic.remote_addr =
1504                                         user_wr->wr.atomic.remote_addr;
1505                                 next->wr.atomic.compare_add =
1506                                         user_wr->wr.atomic.compare_add;
1507                                 next->wr.atomic.swap = user_wr->wr.atomic.swap;
1508                                 next->wr.atomic.rkey = user_wr->wr.atomic.rkey;
1509                                 break;
1510                         default:
1511                                 break;
1512                         }
1513                 }
1514
1515                 if (next->num_sge) {
1516                         next->sg_list = (void *) next +
1517                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
1518                         if (copy_from_user(next->sg_list,
1519                                            buf + sizeof cmd +
1520                                            cmd.wr_count * cmd.wqe_size +
1521                                            sg_ind * sizeof (struct ib_sge),
1522                                            next->num_sge * sizeof (struct ib_sge))) {
1523                                 ret = -EFAULT;
1524                                 goto out_put;
1525                         }
1526                         sg_ind += next->num_sge;
1527                 } else
1528                         next->sg_list = NULL;
1529         }
1530
1531         resp.bad_wr = 0;
1532         ret = qp->device->post_send(qp, wr, &bad_wr);
1533         if (ret)
1534                 for (next = wr; next; next = next->next) {
1535                         ++resp.bad_wr;
1536                         if (next == bad_wr)
1537                                 break;
1538                 }
1539
1540         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1541                          &resp, sizeof resp))
1542                 ret = -EFAULT;
1543
1544 out_put:
1545         put_qp_read(qp);
1546
1547         while (wr) {
1548                 if (is_ud && wr->wr.ud.ah)
1549                         put_ah_read(wr->wr.ud.ah);
1550                 next = wr->next;
1551                 kfree(wr);
1552                 wr = next;
1553         }
1554
1555 out:
1556         kfree(user_wr);
1557
1558         return ret ? ret : in_len;
1559 }
1560
1561 static struct ib_recv_wr *ib_uverbs_unmarshall_recv(const char __user *buf,
1562                                                     int in_len,
1563                                                     u32 wr_count,
1564                                                     u32 sge_count,
1565                                                     u32 wqe_size)
1566 {
1567         struct ib_uverbs_recv_wr *user_wr;
1568         struct ib_recv_wr        *wr = NULL, *last, *next;
1569         int                       sg_ind;
1570         int                       i;
1571         int                       ret;
1572
1573         if (in_len < wqe_size * wr_count +
1574             sge_count * sizeof (struct ib_uverbs_sge))
1575                 return ERR_PTR(-EINVAL);
1576
1577         if (wqe_size < sizeof (struct ib_uverbs_recv_wr))
1578                 return ERR_PTR(-EINVAL);
1579
1580         user_wr = kmalloc(wqe_size, GFP_KERNEL);
1581         if (!user_wr)
1582                 return ERR_PTR(-ENOMEM);
1583
1584         sg_ind = 0;
1585         last = NULL;
1586         for (i = 0; i < wr_count; ++i) {
1587                 if (copy_from_user(user_wr, buf + i * wqe_size,
1588                                    wqe_size)) {
1589                         ret = -EFAULT;
1590                         goto err;
1591                 }
1592
1593                 if (user_wr->num_sge + sg_ind > sge_count) {
1594                         ret = -EINVAL;
1595                         goto err;
1596                 }
1597
1598                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
1599                                user_wr->num_sge * sizeof (struct ib_sge),
1600                                GFP_KERNEL);
1601                 if (!next) {
1602                         ret = -ENOMEM;
1603                         goto err;
1604                 }
1605
1606                 if (!last)
1607                         wr = next;
1608                 else
1609                         last->next = next;
1610                 last = next;
1611
1612                 next->next       = NULL;
1613                 next->wr_id      = user_wr->wr_id;
1614                 next->num_sge    = user_wr->num_sge;
1615
1616                 if (next->num_sge) {
1617                         next->sg_list = (void *) next +
1618                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
1619                         if (copy_from_user(next->sg_list,
1620                                            buf + wr_count * wqe_size +
1621                                            sg_ind * sizeof (struct ib_sge),
1622                                            next->num_sge * sizeof (struct ib_sge))) {
1623                                 ret = -EFAULT;
1624                                 goto err;
1625                         }
1626                         sg_ind += next->num_sge;
1627                 } else
1628                         next->sg_list = NULL;
1629         }
1630
1631         kfree(user_wr);
1632         return wr;
1633
1634 err:
1635         kfree(user_wr);
1636
1637         while (wr) {
1638                 next = wr->next;
1639                 kfree(wr);
1640                 wr = next;
1641         }
1642
1643         return ERR_PTR(ret);
1644 }
1645
1646 ssize_t ib_uverbs_post_recv(struct ib_uverbs_file *file,
1647                             const char __user *buf, int in_len,
1648                             int out_len)
1649 {
1650         struct ib_uverbs_post_recv      cmd;
1651         struct ib_uverbs_post_recv_resp resp;
1652         struct ib_recv_wr              *wr, *next, *bad_wr;
1653         struct ib_qp                   *qp;
1654         ssize_t                         ret = -EINVAL;
1655
1656         if (copy_from_user(&cmd, buf, sizeof cmd))
1657                 return -EFAULT;
1658
1659         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
1660                                        in_len - sizeof cmd, cmd.wr_count,
1661                                        cmd.sge_count, cmd.wqe_size);
1662         if (IS_ERR(wr))
1663                 return PTR_ERR(wr);
1664
1665         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1666         if (!qp)
1667                 goto out;
1668
1669         resp.bad_wr = 0;
1670         ret = qp->device->post_recv(qp, wr, &bad_wr);
1671
1672         put_qp_read(qp);
1673
1674         if (ret)
1675                 for (next = wr; next; next = next->next) {
1676                         ++resp.bad_wr;
1677                         if (next == bad_wr)
1678                                 break;
1679                 }
1680
1681         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1682                          &resp, sizeof resp))
1683                 ret = -EFAULT;
1684
1685 out:
1686         while (wr) {
1687                 next = wr->next;
1688                 kfree(wr);
1689                 wr = next;
1690         }
1691
1692         return ret ? ret : in_len;
1693 }
1694
1695 ssize_t ib_uverbs_post_srq_recv(struct ib_uverbs_file *file,
1696                                 const char __user *buf, int in_len,
1697                                 int out_len)
1698 {
1699         struct ib_uverbs_post_srq_recv      cmd;
1700         struct ib_uverbs_post_srq_recv_resp resp;
1701         struct ib_recv_wr                  *wr, *next, *bad_wr;
1702         struct ib_srq                      *srq;
1703         ssize_t                             ret = -EINVAL;
1704
1705         if (copy_from_user(&cmd, buf, sizeof cmd))
1706                 return -EFAULT;
1707
1708         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
1709                                        in_len - sizeof cmd, cmd.wr_count,
1710                                        cmd.sge_count, cmd.wqe_size);
1711         if (IS_ERR(wr))
1712                 return PTR_ERR(wr);
1713
1714         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
1715         if (!srq)
1716                 goto out;
1717
1718         resp.bad_wr = 0;
1719         ret = srq->device->post_srq_recv(srq, wr, &bad_wr);
1720
1721         put_srq_read(srq);
1722
1723         if (ret)
1724                 for (next = wr; next; next = next->next) {
1725                         ++resp.bad_wr;
1726                         if (next == bad_wr)
1727                                 break;
1728                 }
1729
1730         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1731                          &resp, sizeof resp))
1732                 ret = -EFAULT;
1733
1734 out:
1735         while (wr) {
1736                 next = wr->next;
1737                 kfree(wr);
1738                 wr = next;
1739         }
1740
1741         return ret ? ret : in_len;
1742 }
1743
1744 ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
1745                             const char __user *buf, int in_len,
1746                             int out_len)
1747 {
1748         struct ib_uverbs_create_ah       cmd;
1749         struct ib_uverbs_create_ah_resp  resp;
1750         struct ib_uobject               *uobj;
1751         struct ib_pd                    *pd;
1752         struct ib_ah                    *ah;
1753         struct ib_ah_attr               attr;
1754         int ret;
1755
1756         if (out_len < sizeof resp)
1757                 return -ENOSPC;
1758
1759         if (copy_from_user(&cmd, buf, sizeof cmd))
1760                 return -EFAULT;
1761
1762         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
1763         if (!uobj)
1764                 return -ENOMEM;
1765
1766         init_uobj(uobj, cmd.user_handle, file->ucontext, &ah_lock_key);
1767         down_write(&uobj->mutex);
1768
1769         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
1770         if (!pd) {
1771                 ret = -EINVAL;
1772                 goto err;
1773         }
1774
1775         attr.dlid              = cmd.attr.dlid;
1776         attr.sl                = cmd.attr.sl;
1777         attr.src_path_bits     = cmd.attr.src_path_bits;
1778         attr.static_rate       = cmd.attr.static_rate;
1779         attr.ah_flags          = cmd.attr.is_global ? IB_AH_GRH : 0;
1780         attr.port_num          = cmd.attr.port_num;
1781         attr.grh.flow_label    = cmd.attr.grh.flow_label;
1782         attr.grh.sgid_index    = cmd.attr.grh.sgid_index;
1783         attr.grh.hop_limit     = cmd.attr.grh.hop_limit;
1784         attr.grh.traffic_class = cmd.attr.grh.traffic_class;
1785         memcpy(attr.grh.dgid.raw, cmd.attr.grh.dgid, 16);
1786
1787         ah = ib_create_ah(pd, &attr);
1788         if (IS_ERR(ah)) {
1789                 ret = PTR_ERR(ah);
1790                 goto err_put;
1791         }
1792
1793         ah->uobject  = uobj;
1794         uobj->object = ah;
1795
1796         ret = idr_add_uobj(&ib_uverbs_ah_idr, uobj);
1797         if (ret)
1798                 goto err_destroy;
1799
1800         resp.ah_handle = uobj->id;
1801
1802         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1803                          &resp, sizeof resp)) {
1804                 ret = -EFAULT;
1805                 goto err_copy;
1806         }
1807
1808         put_pd_read(pd);
1809
1810         mutex_lock(&file->mutex);
1811         list_add_tail(&uobj->list, &file->ucontext->ah_list);
1812         mutex_unlock(&file->mutex);
1813
1814         uobj->live = 1;
1815
1816         up_write(&uobj->mutex);
1817
1818         return in_len;
1819
1820 err_copy:
1821         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
1822
1823 err_destroy:
1824         ib_destroy_ah(ah);
1825
1826 err_put:
1827         put_pd_read(pd);
1828
1829 err:
1830         put_uobj_write(uobj);
1831         return ret;
1832 }
1833
1834 ssize_t ib_uverbs_destroy_ah(struct ib_uverbs_file *file,
1835                              const char __user *buf, int in_len, int out_len)
1836 {
1837         struct ib_uverbs_destroy_ah cmd;
1838         struct ib_ah               *ah;
1839         struct ib_uobject          *uobj;
1840         int                         ret;
1841
1842         if (copy_from_user(&cmd, buf, sizeof cmd))
1843                 return -EFAULT;
1844
1845         uobj = idr_write_uobj(&ib_uverbs_ah_idr, cmd.ah_handle, file->ucontext);
1846         if (!uobj)
1847                 return -EINVAL;
1848         ah = uobj->object;
1849
1850         ret = ib_destroy_ah(ah);
1851         if (!ret)
1852                 uobj->live = 0;
1853
1854         put_uobj_write(uobj);
1855
1856         if (ret)
1857                 return ret;
1858
1859         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
1860
1861         mutex_lock(&file->mutex);
1862         list_del(&uobj->list);
1863         mutex_unlock(&file->mutex);
1864
1865         put_uobj(uobj);
1866
1867         return in_len;
1868 }
1869
1870 ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
1871                                const char __user *buf, int in_len,
1872                                int out_len)
1873 {
1874         struct ib_uverbs_attach_mcast cmd;
1875         struct ib_qp                 *qp;
1876         struct ib_uqp_object         *obj;
1877         struct ib_uverbs_mcast_entry *mcast;
1878         int                           ret;
1879
1880         if (copy_from_user(&cmd, buf, sizeof cmd))
1881                 return -EFAULT;
1882
1883         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1884         if (!qp)
1885                 return -EINVAL;
1886
1887         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
1888
1889         list_for_each_entry(mcast, &obj->mcast_list, list)
1890                 if (cmd.mlid == mcast->lid &&
1891                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
1892                         ret = 0;
1893                         goto out_put;
1894                 }
1895
1896         mcast = kmalloc(sizeof *mcast, GFP_KERNEL);
1897         if (!mcast) {
1898                 ret = -ENOMEM;
1899                 goto out_put;
1900         }
1901
1902         mcast->lid = cmd.mlid;
1903         memcpy(mcast->gid.raw, cmd.gid, sizeof mcast->gid.raw);
1904
1905         ret = ib_attach_mcast(qp, &mcast->gid, cmd.mlid);
1906         if (!ret)
1907                 list_add_tail(&mcast->list, &obj->mcast_list);
1908         else
1909                 kfree(mcast);
1910
1911 out_put:
1912         put_qp_read(qp);
1913
1914         return ret ? ret : in_len;
1915 }
1916
1917 ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
1918                                const char __user *buf, int in_len,
1919                                int out_len)
1920 {
1921         struct ib_uverbs_detach_mcast cmd;
1922         struct ib_uqp_object         *obj;
1923         struct ib_qp                 *qp;
1924         struct ib_uverbs_mcast_entry *mcast;
1925         int                           ret = -EINVAL;
1926
1927         if (copy_from_user(&cmd, buf, sizeof cmd))
1928                 return -EFAULT;
1929
1930         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1931         if (!qp)
1932                 return -EINVAL;
1933
1934         ret = ib_detach_mcast(qp, (union ib_gid *) cmd.gid, cmd.mlid);
1935         if (ret)
1936                 goto out_put;
1937
1938         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
1939
1940         list_for_each_entry(mcast, &obj->mcast_list, list)
1941                 if (cmd.mlid == mcast->lid &&
1942                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
1943                         list_del(&mcast->list);
1944                         kfree(mcast);
1945                         break;
1946                 }
1947
1948 out_put:
1949         put_qp_read(qp);
1950
1951         return ret ? ret : in_len;
1952 }
1953
1954 ssize_t ib_uverbs_create_srq(struct ib_uverbs_file *file,
1955                              const char __user *buf, int in_len,
1956                              int out_len)
1957 {
1958         struct ib_uverbs_create_srq      cmd;
1959         struct ib_uverbs_create_srq_resp resp;
1960         struct ib_udata                  udata;
1961         struct ib_uevent_object         *obj;
1962         struct ib_pd                    *pd;
1963         struct ib_srq                   *srq;
1964         struct ib_srq_init_attr          attr;
1965         int ret;
1966
1967         if (out_len < sizeof resp)
1968                 return -ENOSPC;
1969
1970         if (copy_from_user(&cmd, buf, sizeof cmd))
1971                 return -EFAULT;
1972
1973         INIT_UDATA(&udata, buf + sizeof cmd,
1974                    (unsigned long) cmd.response + sizeof resp,
1975                    in_len - sizeof cmd, out_len - sizeof resp);
1976
1977         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1978         if (!obj)
1979                 return -ENOMEM;
1980
1981         init_uobj(&obj->uobject, cmd.user_handle, file->ucontext, &srq_lock_key);
1982         down_write(&obj->uobject.mutex);
1983
1984         pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
1985         if (!pd) {
1986                 ret = -EINVAL;
1987                 goto err;
1988         }
1989
1990         attr.event_handler  = ib_uverbs_srq_event_handler;
1991         attr.srq_context    = file;
1992         attr.attr.max_wr    = cmd.max_wr;
1993         attr.attr.max_sge   = cmd.max_sge;
1994         attr.attr.srq_limit = cmd.srq_limit;
1995
1996         obj->events_reported     = 0;
1997         INIT_LIST_HEAD(&obj->event_list);
1998
1999         srq = pd->device->create_srq(pd, &attr, &udata);
2000         if (IS_ERR(srq)) {
2001                 ret = PTR_ERR(srq);
2002                 goto err_put;
2003         }
2004
2005         srq->device        = pd->device;
2006         srq->pd            = pd;
2007         srq->uobject       = &obj->uobject;
2008         srq->event_handler = attr.event_handler;
2009         srq->srq_context   = attr.srq_context;
2010         atomic_inc(&pd->usecnt);
2011         atomic_set(&srq->usecnt, 0);
2012
2013         obj->uobject.object = srq;
2014         ret = idr_add_uobj(&ib_uverbs_srq_idr, &obj->uobject);
2015         if (ret)
2016                 goto err_destroy;
2017
2018         memset(&resp, 0, sizeof resp);
2019         resp.srq_handle = obj->uobject.id;
2020         resp.max_wr     = attr.attr.max_wr;
2021         resp.max_sge    = attr.attr.max_sge;
2022
2023         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2024                          &resp, sizeof resp)) {
2025                 ret = -EFAULT;
2026                 goto err_copy;
2027         }
2028
2029         put_pd_read(pd);
2030
2031         mutex_lock(&file->mutex);
2032         list_add_tail(&obj->uobject.list, &file->ucontext->srq_list);
2033         mutex_unlock(&file->mutex);
2034
2035         obj->uobject.live = 1;
2036
2037         up_write(&obj->uobject.mutex);
2038
2039         return in_len;
2040
2041 err_copy:
2042         idr_remove_uobj(&ib_uverbs_srq_idr, &obj->uobject);
2043
2044 err_destroy:
2045         ib_destroy_srq(srq);
2046
2047 err_put:
2048         put_pd_read(pd);
2049
2050 err:
2051         put_uobj_write(&obj->uobject);
2052         return ret;
2053 }
2054
2055 ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
2056                              const char __user *buf, int in_len,
2057                              int out_len)
2058 {
2059         struct ib_uverbs_modify_srq cmd;
2060         struct ib_udata             udata;
2061         struct ib_srq              *srq;
2062         struct ib_srq_attr          attr;
2063         int                         ret;
2064
2065         if (copy_from_user(&cmd, buf, sizeof cmd))
2066                 return -EFAULT;
2067
2068         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
2069                    out_len);
2070
2071         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2072         if (!srq)
2073                 return -EINVAL;
2074
2075         attr.max_wr    = cmd.max_wr;
2076         attr.srq_limit = cmd.srq_limit;
2077
2078         ret = srq->device->modify_srq(srq, &attr, cmd.attr_mask, &udata);
2079
2080         put_srq_read(srq);
2081
2082         return ret ? ret : in_len;
2083 }
2084
2085 ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
2086                             const char __user *buf,
2087                             int in_len, int out_len)
2088 {
2089         struct ib_uverbs_query_srq      cmd;
2090         struct ib_uverbs_query_srq_resp resp;
2091         struct ib_srq_attr              attr;
2092         struct ib_srq                   *srq;
2093         int                             ret;
2094
2095         if (out_len < sizeof resp)
2096                 return -ENOSPC;
2097
2098         if (copy_from_user(&cmd, buf, sizeof cmd))
2099                 return -EFAULT;
2100
2101         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2102         if (!srq)
2103                 return -EINVAL;
2104
2105         ret = ib_query_srq(srq, &attr);
2106
2107         put_srq_read(srq);
2108
2109         if (ret)
2110                 return ret;
2111
2112         memset(&resp, 0, sizeof resp);
2113
2114         resp.max_wr    = attr.max_wr;
2115         resp.max_sge   = attr.max_sge;
2116         resp.srq_limit = attr.srq_limit;
2117
2118         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2119                          &resp, sizeof resp))
2120                 return -EFAULT;
2121
2122         return in_len;
2123 }
2124
2125 ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
2126                               const char __user *buf, int in_len,
2127                               int out_len)
2128 {
2129         struct ib_uverbs_destroy_srq      cmd;
2130         struct ib_uverbs_destroy_srq_resp resp;
2131         struct ib_uobject                *uobj;
2132         struct ib_srq                    *srq;
2133         struct ib_uevent_object          *obj;
2134         int                               ret = -EINVAL;
2135
2136         if (copy_from_user(&cmd, buf, sizeof cmd))
2137                 return -EFAULT;
2138
2139         uobj = idr_write_uobj(&ib_uverbs_srq_idr, cmd.srq_handle, file->ucontext);
2140         if (!uobj)
2141                 return -EINVAL;
2142         srq = uobj->object;
2143         obj = container_of(uobj, struct ib_uevent_object, uobject);
2144
2145         ret = ib_destroy_srq(srq);
2146         if (!ret)
2147                 uobj->live = 0;
2148
2149         put_uobj_write(uobj);
2150
2151         if (ret)
2152                 return ret;
2153
2154         idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
2155
2156         mutex_lock(&file->mutex);
2157         list_del(&uobj->list);
2158         mutex_unlock(&file->mutex);
2159
2160         ib_uverbs_release_uevent(file, obj);
2161
2162         memset(&resp, 0, sizeof resp);
2163         resp.events_reported = obj->events_reported;
2164
2165         put_uobj(uobj);
2166
2167         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2168                          &resp, sizeof resp))
2169                 ret = -EFAULT;
2170
2171         return ret ? ret : in_len;
2172 }