1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
3  *
4  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
5  * Copyright (c) 2005, 2006, 2007 Cisco Systems.  All rights reserved.
6  * Copyright (c) 2005 PathScale, Inc.  All rights reserved.
7  * Copyright (c) 2006 Mellanox Technologies.  All rights reserved.
8  *
9  * This software is available to you under a choice of one of two
10  * licenses.  You may choose to be licensed under the terms of the GNU
11  * General Public License (GPL) Version 2, available from the file
12  * COPYING in the main directory of this source tree, or the
13  * OpenIB.org BSD license below:
14  *
15  *     Redistribution and use in source and binary forms, with or
16  *     without modification, are permitted provided that the following
17  *     conditions are met:
18  *
19  *      - Redistributions of source code must retain the above
20  *        copyright notice, this list of conditions and the following
21  *        disclaimer.
22  *
23  *      - Redistributions in binary form must reproduce the above
24  *        copyright notice, this list of conditions and the following
25  *        disclaimer in the documentation and/or other materials
26  *        provided with the distribution.
27  *
28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
32  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
33  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
34  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35  * SOFTWARE.
36  *
37  * $FreeBSD$
38  */
39 
40 #define	LINUXKPI_PARAM_PREFIX ibcore_
41 
42 #include <linux/file.h>
43 #include <linux/fs.h>
44 #include <linux/slab.h>
45 #include <linux/sched.h>
46 #include <linux/rbtree.h>
47 
48 #include <asm/uaccess.h>
49 
50 #include "uverbs.h"
51 #include "core_priv.h"
52 
53 #include <sys/priv.h>
54 
55 struct uverbs_lock_class {
56 	char			name[16];
57 };
58 
59 static struct uverbs_lock_class pd_lock_class	= { .name = "PD-uobj" };
60 static struct uverbs_lock_class mr_lock_class	= { .name = "MR-uobj" };
61 static struct uverbs_lock_class mw_lock_class	= { .name = "MW-uobj" };
62 static struct uverbs_lock_class cq_lock_class	= { .name = "CQ-uobj" };
63 static struct uverbs_lock_class qp_lock_class	= { .name = "QP-uobj" };
64 static struct uverbs_lock_class ah_lock_class	= { .name = "AH-uobj" };
65 static struct uverbs_lock_class srq_lock_class	= { .name = "SRQ-uobj" };
66 static struct uverbs_lock_class xrcd_lock_class = { .name = "XRCD-uobj" };
67 static struct uverbs_lock_class rule_lock_class = { .name = "RULE-uobj" };
68 static struct uverbs_lock_class wq_lock_class = { .name = "WQ-uobj" };
69 static struct uverbs_lock_class rwq_ind_table_lock_class = { .name = "IND_TBL-uobj" };
70 
71 /*
72  * The ib_uobject locking scheme is as follows:
73  *
74  * - ib_uverbs_idr_lock protects the uverbs idrs themselves, so it
75  *   needs to be held during all idr write operations.  When an object is
76  *   looked up, a reference must be taken on the object's kref before
77  *   dropping this lock.  For read operations, the rcu_read_lock()
78  *   and rcu_write_lock() but similarly the kref reference is grabbed
79  *   before the rcu_read_unlock().
80  *
81  * - Each object also has an rwsem.  This rwsem must be held for
82  *   reading while an operation that uses the object is performed.
83  *   For example, while registering an MR, the associated PD's
84  *   uobject.mutex must be held for reading.  The rwsem must be held
85  *   for writing while initializing or destroying an object.
86  *
87  * - In addition, each object has a "live" flag.  If this flag is not
88  *   set, then lookups of the object will fail even if it is found in
89  *   the idr.  This handles a reader that blocks and does not acquire
90  *   the rwsem until after the object is destroyed.  The destroy
91  *   operation will set the live flag to 0 and then drop the rwsem;
92  *   this will allow the reader to acquire the rwsem, see that the
93  *   live flag is 0, and then drop the rwsem and its reference to
94  *   object.  The underlying storage will not be freed until the last
95  *   reference to the object is dropped.
96  */
97 
98 static void init_uobj(struct ib_uobject *uobj, u64 user_handle,
99 		      struct ib_ucontext *context, struct uverbs_lock_class *c)
100 {
101 	uobj->user_handle = user_handle;
102 	uobj->context     = context;
103 	kref_init(&uobj->ref);
104 	init_rwsem(&uobj->mutex);
105 	uobj->live        = 0;
106 }
107 
108 static void release_uobj(struct kref *kref)
109 {
110 	kfree_rcu(container_of(kref, struct ib_uobject, ref), rcu);
111 }
112 
113 static void put_uobj(struct ib_uobject *uobj)
114 {
115 	kref_put(&uobj->ref, release_uobj);
116 }
117 
118 static void put_uobj_read(struct ib_uobject *uobj)
119 {
120 	up_read(&uobj->mutex);
121 	put_uobj(uobj);
122 }
123 
124 static void put_uobj_write(struct ib_uobject *uobj)
125 {
126 	up_write(&uobj->mutex);
127 	put_uobj(uobj);
128 }
129 
130 static int idr_add_uobj(struct idr *idr, struct ib_uobject *uobj)
131 {
132 	int ret;
133 
134 	idr_preload(GFP_KERNEL);
135 	spin_lock(&ib_uverbs_idr_lock);
136 
137 	ret = idr_alloc(idr, uobj, 0, 0, GFP_NOWAIT);
138 	if (ret >= 0)
139 		uobj->id = ret;
140 
141 	spin_unlock(&ib_uverbs_idr_lock);
142 	idr_preload_end();
143 
144 	return ret < 0 ? ret : 0;
145 }
146 
147 void idr_remove_uobj(struct idr *idr, struct ib_uobject *uobj)
148 {
149 	spin_lock(&ib_uverbs_idr_lock);
150 	idr_remove(idr, uobj->id);
151 	spin_unlock(&ib_uverbs_idr_lock);
152 }
153 
154 static struct ib_uobject *__idr_get_uobj(struct idr *idr, int id,
155 					 struct ib_ucontext *context)
156 {
157 	struct ib_uobject *uobj;
158 
159 	rcu_read_lock();
160 	uobj = idr_find(idr, id);
161 	if (uobj) {
162 		if (uobj->context == context)
163 			kref_get(&uobj->ref);
164 		else
165 			uobj = NULL;
166 	}
167 	rcu_read_unlock();
168 
169 	return uobj;
170 }
171 
172 static struct ib_uobject *idr_read_uobj(struct idr *idr, int id,
173 					struct ib_ucontext *context, int nested)
174 {
175 	struct ib_uobject *uobj;
176 
177 	uobj = __idr_get_uobj(idr, id, context);
178 	if (!uobj)
179 		return NULL;
180 
181 	if (nested)
182 		down_read_nested(&uobj->mutex, SINGLE_DEPTH_NESTING);
183 	else
184 		down_read(&uobj->mutex);
185 	if (!uobj->live) {
186 		put_uobj_read(uobj);
187 		return NULL;
188 	}
189 
190 	return uobj;
191 }
192 
193 static struct ib_uobject *idr_write_uobj(struct idr *idr, int id,
194 					 struct ib_ucontext *context)
195 {
196 	struct ib_uobject *uobj;
197 
198 	uobj = __idr_get_uobj(idr, id, context);
199 	if (!uobj)
200 		return NULL;
201 
202 	down_write(&uobj->mutex);
203 	if (!uobj->live) {
204 		put_uobj_write(uobj);
205 		return NULL;
206 	}
207 
208 	return uobj;
209 }
210 
211 static void *idr_read_obj(struct idr *idr, int id, struct ib_ucontext *context,
212 			  int nested)
213 {
214 	struct ib_uobject *uobj;
215 
216 	uobj = idr_read_uobj(idr, id, context, nested);
217 	return uobj ? uobj->object : NULL;
218 }
219 
220 static struct ib_pd *idr_read_pd(int pd_handle, struct ib_ucontext *context)
221 {
222 	return idr_read_obj(&ib_uverbs_pd_idr, pd_handle, context, 0);
223 }
224 
225 static void put_pd_read(struct ib_pd *pd)
226 {
227 	put_uobj_read(pd->uobject);
228 }
229 
230 static struct ib_cq *idr_read_cq(int cq_handle, struct ib_ucontext *context, int nested)
231 {
232 	return idr_read_obj(&ib_uverbs_cq_idr, cq_handle, context, nested);
233 }
234 
235 static void put_cq_read(struct ib_cq *cq)
236 {
237 	put_uobj_read(cq->uobject);
238 }
239 
240 static struct ib_ah *idr_read_ah(int ah_handle, struct ib_ucontext *context)
241 {
242 	return idr_read_obj(&ib_uverbs_ah_idr, ah_handle, context, 0);
243 }
244 
245 static void put_ah_read(struct ib_ah *ah)
246 {
247 	put_uobj_read(ah->uobject);
248 }
249 
250 static struct ib_qp *idr_read_qp(int qp_handle, struct ib_ucontext *context)
251 {
252 	return idr_read_obj(&ib_uverbs_qp_idr, qp_handle, context, 0);
253 }
254 
255 static struct ib_wq *idr_read_wq(int wq_handle, struct ib_ucontext *context)
256 {
257 	return idr_read_obj(&ib_uverbs_wq_idr, wq_handle, context, 0);
258 }
259 
260 static void put_wq_read(struct ib_wq *wq)
261 {
262 	put_uobj_read(wq->uobject);
263 }
264 
265 static struct ib_rwq_ind_table *idr_read_rwq_indirection_table(int ind_table_handle,
266 							       struct ib_ucontext *context)
267 {
268 	return idr_read_obj(&ib_uverbs_rwq_ind_tbl_idr, ind_table_handle, context, 0);
269 }
270 
271 static void put_rwq_indirection_table_read(struct ib_rwq_ind_table *ind_table)
272 {
273 	put_uobj_read(ind_table->uobject);
274 }
275 
276 static struct ib_qp *idr_write_qp(int qp_handle, struct ib_ucontext *context)
277 {
278 	struct ib_uobject *uobj;
279 
280 	uobj = idr_write_uobj(&ib_uverbs_qp_idr, qp_handle, context);
281 	return uobj ? uobj->object : NULL;
282 }
283 
284 static void put_qp_read(struct ib_qp *qp)
285 {
286 	put_uobj_read(qp->uobject);
287 }
288 
289 static void put_qp_write(struct ib_qp *qp)
290 {
291 	put_uobj_write(qp->uobject);
292 }
293 
294 static struct ib_srq *idr_read_srq(int srq_handle, struct ib_ucontext *context)
295 {
296 	return idr_read_obj(&ib_uverbs_srq_idr, srq_handle, context, 0);
297 }
298 
299 static void put_srq_read(struct ib_srq *srq)
300 {
301 	put_uobj_read(srq->uobject);
302 }
303 
304 static struct ib_xrcd *idr_read_xrcd(int xrcd_handle, struct ib_ucontext *context,
305 				     struct ib_uobject **uobj)
306 {
307 	*uobj = idr_read_uobj(&ib_uverbs_xrcd_idr, xrcd_handle, context, 0);
308 	return *uobj ? (*uobj)->object : NULL;
309 }
310 
311 static void put_xrcd_read(struct ib_uobject *uobj)
312 {
313 	put_uobj_read(uobj);
314 }
315 
316 ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
317 			      struct ib_device *ib_dev,
318 			      const char __user *buf,
319 			      int in_len, int out_len)
320 {
321 	struct ib_uverbs_get_context      cmd;
322 	struct ib_uverbs_get_context_resp resp;
323 	struct ib_udata                   udata;
324 	struct ib_ucontext		 *ucontext;
325 	struct file			 *filp;
326 	int ret;
327 
328 	if (out_len < sizeof resp)
329 		return -ENOSPC;
330 
331 	if (copy_from_user(&cmd, buf, sizeof cmd))
332 		return -EFAULT;
333 
334 	mutex_lock(&file->mutex);
335 
336 	if (file->ucontext) {
337 		ret = -EINVAL;
338 		goto err;
339 	}
340 
341 	INIT_UDATA(&udata, buf + sizeof cmd,
342 		   (unsigned long) cmd.response + sizeof resp,
343 		   in_len - sizeof cmd, out_len - sizeof resp);
344 
345 	ucontext = ib_dev->alloc_ucontext(ib_dev, &udata);
346 	if (IS_ERR(ucontext)) {
347 		ret = PTR_ERR(ucontext);
348 		goto err;
349 	}
350 
351 	ucontext->device = ib_dev;
352 	INIT_LIST_HEAD(&ucontext->pd_list);
353 	INIT_LIST_HEAD(&ucontext->mr_list);
354 	INIT_LIST_HEAD(&ucontext->mw_list);
355 	INIT_LIST_HEAD(&ucontext->cq_list);
356 	INIT_LIST_HEAD(&ucontext->qp_list);
357 	INIT_LIST_HEAD(&ucontext->srq_list);
358 	INIT_LIST_HEAD(&ucontext->ah_list);
359 	INIT_LIST_HEAD(&ucontext->wq_list);
360 	INIT_LIST_HEAD(&ucontext->rwq_ind_tbl_list);
361 	INIT_LIST_HEAD(&ucontext->xrcd_list);
362 	INIT_LIST_HEAD(&ucontext->rule_list);
363 	rcu_read_lock();
364 	ucontext->tgid = get_pid(task_pid_group_leader(current));
365 	rcu_read_unlock();
366 	ucontext->closing = 0;
367 
368 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
369 	ucontext->umem_tree = RB_ROOT;
370 	init_rwsem(&ucontext->umem_rwsem);
371 	ucontext->odp_mrs_count = 0;
372 	INIT_LIST_HEAD(&ucontext->no_private_counters);
373 
374 	if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_ON_DEMAND_PAGING))
375 		ucontext->invalidate_range = NULL;
376 
377 #endif
378 
379 	resp.num_comp_vectors = file->device->num_comp_vectors;
380 
381 	ret = get_unused_fd_flags(O_CLOEXEC);
382 	if (ret < 0)
383 		goto err_free;
384 	resp.async_fd = ret;
385 
386 	filp = ib_uverbs_alloc_event_file(file, ib_dev, 1);
387 	if (IS_ERR(filp)) {
388 		ret = PTR_ERR(filp);
389 		goto err_fd;
390 	}
391 
392 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
393 			 &resp, sizeof resp)) {
394 		ret = -EFAULT;
395 		goto err_file;
396 	}
397 
398 	file->ucontext = ucontext;
399 
400 	fd_install(resp.async_fd, filp);
401 
402 	mutex_unlock(&file->mutex);
403 
404 	return in_len;
405 
406 err_file:
407 	ib_uverbs_free_async_event_file(file);
408 	fput(filp);
409 
410 err_fd:
411 	put_unused_fd(resp.async_fd);
412 
413 err_free:
414 	put_pid(ucontext->tgid);
415 	ib_dev->dealloc_ucontext(ucontext);
416 
417 err:
418 	mutex_unlock(&file->mutex);
419 	return ret;
420 }
421 
422 static void copy_query_dev_fields(struct ib_uverbs_file *file,
423 				  struct ib_device *ib_dev,
424 				  struct ib_uverbs_query_device_resp *resp,
425 				  struct ib_device_attr *attr)
426 {
427 	resp->fw_ver		= attr->fw_ver;
428 	resp->node_guid		= ib_dev->node_guid;
429 	resp->sys_image_guid	= attr->sys_image_guid;
430 	resp->max_mr_size	= attr->max_mr_size;
431 	resp->page_size_cap	= attr->page_size_cap;
432 	resp->vendor_id		= attr->vendor_id;
433 	resp->vendor_part_id	= attr->vendor_part_id;
434 	resp->hw_ver		= attr->hw_ver;
435 	resp->max_qp		= attr->max_qp;
436 	resp->max_qp_wr		= attr->max_qp_wr;
437 	resp->device_cap_flags	= (u32)(attr->device_cap_flags);
438 	resp->max_sge		= attr->max_sge;
439 	resp->max_sge_rd	= attr->max_sge_rd;
440 	resp->max_cq		= attr->max_cq;
441 	resp->max_cqe		= attr->max_cqe;
442 	resp->max_mr		= attr->max_mr;
443 	resp->max_pd		= attr->max_pd;
444 	resp->max_qp_rd_atom	= attr->max_qp_rd_atom;
445 	resp->max_ee_rd_atom	= attr->max_ee_rd_atom;
446 	resp->max_res_rd_atom	= attr->max_res_rd_atom;
447 	resp->max_qp_init_rd_atom	= attr->max_qp_init_rd_atom;
448 	resp->max_ee_init_rd_atom	= attr->max_ee_init_rd_atom;
449 	resp->atomic_cap		= attr->atomic_cap;
450 	resp->max_ee			= attr->max_ee;
451 	resp->max_rdd			= attr->max_rdd;
452 	resp->max_mw			= attr->max_mw;
453 	resp->max_raw_ipv6_qp		= attr->max_raw_ipv6_qp;
454 	resp->max_raw_ethy_qp		= attr->max_raw_ethy_qp;
455 	resp->max_mcast_grp		= attr->max_mcast_grp;
456 	resp->max_mcast_qp_attach	= attr->max_mcast_qp_attach;
457 	resp->max_total_mcast_qp_attach	= attr->max_total_mcast_qp_attach;
458 	resp->max_ah			= attr->max_ah;
459 	resp->max_fmr			= attr->max_fmr;
460 	resp->max_map_per_fmr		= attr->max_map_per_fmr;
461 	resp->max_srq			= attr->max_srq;
462 	resp->max_srq_wr		= attr->max_srq_wr;
463 	resp->max_srq_sge		= attr->max_srq_sge;
464 	resp->max_pkeys			= attr->max_pkeys;
465 	resp->local_ca_ack_delay	= attr->local_ca_ack_delay;
466 	resp->phys_port_cnt		= ib_dev->phys_port_cnt;
467 }
468 
469 ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
470 			       struct ib_device *ib_dev,
471 			       const char __user *buf,
472 			       int in_len, int out_len)
473 {
474 	struct ib_uverbs_query_device      cmd;
475 	struct ib_uverbs_query_device_resp resp;
476 
477 	if (out_len < sizeof resp)
478 		return -ENOSPC;
479 
480 	if (copy_from_user(&cmd, buf, sizeof cmd))
481 		return -EFAULT;
482 
483 	memset(&resp, 0, sizeof resp);
484 	copy_query_dev_fields(file, ib_dev, &resp, &ib_dev->attrs);
485 
486 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
487 			 &resp, sizeof resp))
488 		return -EFAULT;
489 
490 	return in_len;
491 }
492 
493 ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
494 			     struct ib_device *ib_dev,
495 			     const char __user *buf,
496 			     int in_len, int out_len)
497 {
498 	struct ib_uverbs_query_port      cmd;
499 	struct ib_uverbs_query_port_resp resp;
500 	struct ib_port_attr              attr;
501 	int                              ret;
502 
503 	if (out_len < sizeof resp)
504 		return -ENOSPC;
505 
506 	if (copy_from_user(&cmd, buf, sizeof cmd))
507 		return -EFAULT;
508 
509 	ret = ib_query_port(ib_dev, cmd.port_num, &attr);
510 	if (ret)
511 		return ret;
512 
513 	memset(&resp, 0, sizeof resp);
514 
515 	resp.state 	     = attr.state;
516 	resp.max_mtu 	     = attr.max_mtu;
517 	resp.active_mtu      = attr.active_mtu;
518 	resp.gid_tbl_len     = attr.gid_tbl_len;
519 	resp.port_cap_flags  = attr.port_cap_flags;
520 	resp.max_msg_sz      = attr.max_msg_sz;
521 	resp.bad_pkey_cntr   = attr.bad_pkey_cntr;
522 	resp.qkey_viol_cntr  = attr.qkey_viol_cntr;
523 	resp.pkey_tbl_len    = attr.pkey_tbl_len;
524 	resp.lid 	     = attr.lid;
525 	resp.sm_lid 	     = attr.sm_lid;
526 	resp.lmc 	     = attr.lmc;
527 	resp.max_vl_num      = attr.max_vl_num;
528 	resp.sm_sl 	     = attr.sm_sl;
529 	resp.subnet_timeout  = attr.subnet_timeout;
530 	resp.init_type_reply = attr.init_type_reply;
531 	resp.active_width    = attr.active_width;
532 	resp.active_speed    = attr.active_speed;
533 	resp.phys_state      = attr.phys_state;
534 	resp.link_layer      = rdma_port_get_link_layer(ib_dev,
535 							cmd.port_num);
536 
537 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
538 			 &resp, sizeof resp))
539 		return -EFAULT;
540 
541 	return in_len;
542 }
543 
544 ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
545 			   struct ib_device *ib_dev,
546 			   const char __user *buf,
547 			   int in_len, int out_len)
548 {
549 	struct ib_uverbs_alloc_pd      cmd;
550 	struct ib_uverbs_alloc_pd_resp resp;
551 	struct ib_udata                udata;
552 	struct ib_uobject             *uobj;
553 	struct ib_pd                  *pd;
554 	int                            ret;
555 
556 	if (out_len < sizeof resp)
557 		return -ENOSPC;
558 
559 	if (copy_from_user(&cmd, buf, sizeof cmd))
560 		return -EFAULT;
561 
562 	INIT_UDATA(&udata, buf + sizeof cmd,
563 		   (unsigned long) cmd.response + sizeof resp,
564 		   in_len - sizeof cmd, out_len - sizeof resp);
565 
566 	uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
567 	if (!uobj)
568 		return -ENOMEM;
569 
570 	init_uobj(uobj, 0, file->ucontext, &pd_lock_class);
571 	down_write(&uobj->mutex);
572 
573 	pd = ib_dev->alloc_pd(ib_dev, file->ucontext, &udata);
574 	if (IS_ERR(pd)) {
575 		ret = PTR_ERR(pd);
576 		goto err;
577 	}
578 
579 	pd->device  = ib_dev;
580 	pd->uobject = uobj;
581 	pd->__internal_mr = NULL;
582 	atomic_set(&pd->usecnt, 0);
583 
584 	uobj->object = pd;
585 	ret = idr_add_uobj(&ib_uverbs_pd_idr, uobj);
586 	if (ret)
587 		goto err_idr;
588 
589 	memset(&resp, 0, sizeof resp);
590 	resp.pd_handle = uobj->id;
591 
592 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
593 			 &resp, sizeof resp)) {
594 		ret = -EFAULT;
595 		goto err_copy;
596 	}
597 
598 	mutex_lock(&file->mutex);
599 	list_add_tail(&uobj->list, &file->ucontext->pd_list);
600 	mutex_unlock(&file->mutex);
601 
602 	uobj->live = 1;
603 
604 	up_write(&uobj->mutex);
605 
606 	return in_len;
607 
608 err_copy:
609 	idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
610 
611 err_idr:
612 	ib_dealloc_pd(pd);
613 
614 err:
615 	put_uobj_write(uobj);
616 	return ret;
617 }
618 
619 ssize_t ib_uverbs_dealloc_pd(struct ib_uverbs_file *file,
620 			     struct ib_device *ib_dev,
621 			     const char __user *buf,
622 			     int in_len, int out_len)
623 {
624 	struct ib_uverbs_dealloc_pd cmd;
625 	struct ib_uobject          *uobj;
626 	struct ib_pd		   *pd;
627 	int                         ret;
628 
629 	if (copy_from_user(&cmd, buf, sizeof cmd))
630 		return -EFAULT;
631 
632 	uobj = idr_write_uobj(&ib_uverbs_pd_idr, cmd.pd_handle, file->ucontext);
633 	if (!uobj)
634 		return -EINVAL;
635 	pd = uobj->object;
636 
637 	if (atomic_read(&pd->usecnt)) {
638 		ret = -EBUSY;
639 		goto err_put;
640 	}
641 
642 	ret = pd->device->dealloc_pd(uobj->object);
643 	WARN_ONCE(ret, "Infiniband HW driver failed dealloc_pd");
644 	if (ret)
645 		goto err_put;
646 
647 	uobj->live = 0;
648 	put_uobj_write(uobj);
649 
650 	idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
651 
652 	mutex_lock(&file->mutex);
653 	list_del(&uobj->list);
654 	mutex_unlock(&file->mutex);
655 
656 	put_uobj(uobj);
657 
658 	return in_len;
659 
660 err_put:
661 	put_uobj_write(uobj);
662 	return ret;
663 }
664 
665 struct xrcd_table_entry {
666 	struct rb_node  node;
667 	struct ib_xrcd *xrcd;
668 	struct inode   *inode;
669 };
670 
671 static int xrcd_table_insert(struct ib_uverbs_device *dev,
672 			    struct inode *inode,
673 			    struct ib_xrcd *xrcd)
674 {
675 	struct xrcd_table_entry *entry, *scan;
676 	struct rb_node **p = &dev->xrcd_tree.rb_node;
677 	struct rb_node *parent = NULL;
678 
679 	entry = kmalloc(sizeof *entry, GFP_KERNEL);
680 	if (!entry)
681 		return -ENOMEM;
682 
683 	entry->xrcd  = xrcd;
684 	entry->inode = inode;
685 
686 	while (*p) {
687 		parent = *p;
688 		scan = rb_entry(parent, struct xrcd_table_entry, node);
689 
690 		if (inode < scan->inode) {
691 			p = &(*p)->rb_left;
692 		} else if (inode > scan->inode) {
693 			p = &(*p)->rb_right;
694 		} else {
695 			kfree(entry);
696 			return -EEXIST;
697 		}
698 	}
699 
700 	rb_link_node(&entry->node, parent, p);
701 	rb_insert_color(&entry->node, &dev->xrcd_tree);
702 	igrab(inode);
703 	return 0;
704 }
705 
706 static struct xrcd_table_entry *xrcd_table_search(struct ib_uverbs_device *dev,
707 						  struct inode *inode)
708 {
709 	struct xrcd_table_entry *entry;
710 	struct rb_node *p = dev->xrcd_tree.rb_node;
711 
712 	while (p) {
713 		entry = rb_entry(p, struct xrcd_table_entry, node);
714 
715 		if (inode < entry->inode)
716 			p = p->rb_left;
717 		else if (inode > entry->inode)
718 			p = p->rb_right;
719 		else
720 			return entry;
721 	}
722 
723 	return NULL;
724 }
725 
726 static struct ib_xrcd *find_xrcd(struct ib_uverbs_device *dev, struct inode *inode)
727 {
728 	struct xrcd_table_entry *entry;
729 
730 	entry = xrcd_table_search(dev, inode);
731 	if (!entry)
732 		return NULL;
733 
734 	return entry->xrcd;
735 }
736 
737 static void xrcd_table_delete(struct ib_uverbs_device *dev,
738 			      struct inode *inode)
739 {
740 	struct xrcd_table_entry *entry;
741 
742 	entry = xrcd_table_search(dev, inode);
743 	if (entry) {
744 		iput(inode);
745 		rb_erase(&entry->node, &dev->xrcd_tree);
746 		kfree(entry);
747 	}
748 }
749 
750 ssize_t ib_uverbs_open_xrcd(struct ib_uverbs_file *file,
751 			    struct ib_device *ib_dev,
752 			    const char __user *buf, int in_len,
753 			    int out_len)
754 {
755 	struct ib_uverbs_open_xrcd	cmd;
756 	struct ib_uverbs_open_xrcd_resp	resp;
757 	struct ib_udata			udata;
758 	struct ib_uxrcd_object         *obj;
759 	struct ib_xrcd                 *xrcd = NULL;
760 	struct fd			f = {NULL};
761 	struct inode                   *inode = NULL;
762 	int				ret = 0;
763 	int				new_xrcd = 0;
764 
765 	if (out_len < sizeof resp)
766 		return -ENOSPC;
767 
768 	if (copy_from_user(&cmd, buf, sizeof cmd))
769 		return -EFAULT;
770 
771 	INIT_UDATA(&udata, buf + sizeof cmd,
772 		   (unsigned long) cmd.response + sizeof resp,
773 		   in_len - sizeof cmd, out_len - sizeof  resp);
774 
775 	mutex_lock(&file->device->xrcd_tree_mutex);
776 
777 	if (cmd.fd != -1) {
778 		/* search for file descriptor */
779 		f = fdget(cmd.fd);
780 		if (!f.file) {
781 			ret = -EBADF;
782 			goto err_tree_mutex_unlock;
783 		}
784 
785 		inode = f.file->f_dentry->d_inode;
786 		xrcd = find_xrcd(file->device, inode);
787 		if (!xrcd && !(cmd.oflags & O_CREAT)) {
788 			/* no file descriptor. Need CREATE flag */
789 			ret = -EAGAIN;
790 			goto err_tree_mutex_unlock;
791 		}
792 
793 		if (xrcd && cmd.oflags & O_EXCL) {
794 			ret = -EINVAL;
795 			goto err_tree_mutex_unlock;
796 		}
797 	}
798 
799 	obj = kmalloc(sizeof *obj, GFP_KERNEL);
800 	if (!obj) {
801 		ret = -ENOMEM;
802 		goto err_tree_mutex_unlock;
803 	}
804 
805 	init_uobj(&obj->uobject, 0, file->ucontext, &xrcd_lock_class);
806 
807 	down_write(&obj->uobject.mutex);
808 
809 	if (!xrcd) {
810 		xrcd = ib_dev->alloc_xrcd(ib_dev, file->ucontext, &udata);
811 		if (IS_ERR(xrcd)) {
812 			ret = PTR_ERR(xrcd);
813 			goto err;
814 		}
815 
816 		xrcd->inode   = inode;
817 		xrcd->device  = ib_dev;
818 		atomic_set(&xrcd->usecnt, 0);
819 		mutex_init(&xrcd->tgt_qp_mutex);
820 		INIT_LIST_HEAD(&xrcd->tgt_qp_list);
821 		new_xrcd = 1;
822 	}
823 
824 	atomic_set(&obj->refcnt, 0);
825 	obj->uobject.object = xrcd;
826 	ret = idr_add_uobj(&ib_uverbs_xrcd_idr, &obj->uobject);
827 	if (ret)
828 		goto err_idr;
829 
830 	memset(&resp, 0, sizeof resp);
831 	resp.xrcd_handle = obj->uobject.id;
832 
833 	if (inode) {
834 		if (new_xrcd) {
835 			/* create new inode/xrcd table entry */
836 			ret = xrcd_table_insert(file->device, inode, xrcd);
837 			if (ret)
838 				goto err_insert_xrcd;
839 		}
840 		atomic_inc(&xrcd->usecnt);
841 	}
842 
843 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
844 			 &resp, sizeof resp)) {
845 		ret = -EFAULT;
846 		goto err_copy;
847 	}
848 
849 	if (f.file)
850 		fdput(f);
851 
852 	mutex_lock(&file->mutex);
853 	list_add_tail(&obj->uobject.list, &file->ucontext->xrcd_list);
854 	mutex_unlock(&file->mutex);
855 
856 	obj->uobject.live = 1;
857 	up_write(&obj->uobject.mutex);
858 
859 	mutex_unlock(&file->device->xrcd_tree_mutex);
860 	return in_len;
861 
862 err_copy:
863 	if (inode) {
864 		if (new_xrcd)
865 			xrcd_table_delete(file->device, inode);
866 		atomic_dec(&xrcd->usecnt);
867 	}
868 
869 err_insert_xrcd:
870 	idr_remove_uobj(&ib_uverbs_xrcd_idr, &obj->uobject);
871 
872 err_idr:
873 	ib_dealloc_xrcd(xrcd);
874 
875 err:
876 	put_uobj_write(&obj->uobject);
877 
878 err_tree_mutex_unlock:
879 	if (f.file)
880 		fdput(f);
881 
882 	mutex_unlock(&file->device->xrcd_tree_mutex);
883 
884 	return ret;
885 }
886 
887 ssize_t ib_uverbs_close_xrcd(struct ib_uverbs_file *file,
888 			     struct ib_device *ib_dev,
889 			     const char __user *buf, int in_len,
890 			     int out_len)
891 {
892 	struct ib_uverbs_close_xrcd cmd;
893 	struct ib_uobject           *uobj;
894 	struct ib_xrcd              *xrcd = NULL;
895 	struct inode                *inode = NULL;
896 	struct ib_uxrcd_object      *obj;
897 	int                         live;
898 	int                         ret = 0;
899 
900 	if (copy_from_user(&cmd, buf, sizeof cmd))
901 		return -EFAULT;
902 
903 	mutex_lock(&file->device->xrcd_tree_mutex);
904 	uobj = idr_write_uobj(&ib_uverbs_xrcd_idr, cmd.xrcd_handle, file->ucontext);
905 	if (!uobj) {
906 		ret = -EINVAL;
907 		goto out;
908 	}
909 
910 	xrcd  = uobj->object;
911 	inode = xrcd->inode;
912 	obj   = container_of(uobj, struct ib_uxrcd_object, uobject);
913 	if (atomic_read(&obj->refcnt)) {
914 		put_uobj_write(uobj);
915 		ret = -EBUSY;
916 		goto out;
917 	}
918 
919 	if (!inode || atomic_dec_and_test(&xrcd->usecnt)) {
920 		ret = ib_dealloc_xrcd(uobj->object);
921 		if (!ret)
922 			uobj->live = 0;
923 	}
924 
925 	live = uobj->live;
926 	if (inode && ret)
927 		atomic_inc(&xrcd->usecnt);
928 
929 	put_uobj_write(uobj);
930 
931 	if (ret)
932 		goto out;
933 
934 	if (inode && !live)
935 		xrcd_table_delete(file->device, inode);
936 
937 	idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
938 	mutex_lock(&file->mutex);
939 	list_del(&uobj->list);
940 	mutex_unlock(&file->mutex);
941 
942 	put_uobj(uobj);
943 	ret = in_len;
944 
945 out:
946 	mutex_unlock(&file->device->xrcd_tree_mutex);
947 	return ret;
948 }
949 
950 void ib_uverbs_dealloc_xrcd(struct ib_uverbs_device *dev,
951 			    struct ib_xrcd *xrcd)
952 {
953 	struct inode *inode;
954 
955 	inode = xrcd->inode;
956 	if (inode && !atomic_dec_and_test(&xrcd->usecnt))
957 		return;
958 
959 	ib_dealloc_xrcd(xrcd);
960 
961 	if (inode)
962 		xrcd_table_delete(dev, inode);
963 }
964 
965 ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
966 			 struct ib_device *ib_dev,
967 			 const char __user *buf, int in_len,
968 			 int out_len)
969 {
970 	struct ib_uverbs_reg_mr      cmd;
971 	struct ib_uverbs_reg_mr_resp resp;
972 	struct ib_udata              udata;
973 	struct ib_uobject           *uobj;
974 	struct ib_pd                *pd;
975 	struct ib_mr                *mr;
976 	int                          ret;
977 
978 	if (out_len < sizeof resp)
979 		return -ENOSPC;
980 
981 	if (copy_from_user(&cmd, buf, sizeof cmd))
982 		return -EFAULT;
983 
984 	INIT_UDATA(&udata, buf + sizeof cmd,
985 		   (unsigned long) cmd.response + sizeof resp,
986 		   in_len - sizeof cmd, out_len - sizeof resp);
987 
988 	if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))
989 		return -EINVAL;
990 
991 	ret = ib_check_mr_access(cmd.access_flags);
992 	if (ret)
993 		return ret;
994 
995 	uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
996 	if (!uobj)
997 		return -ENOMEM;
998 
999 	init_uobj(uobj, 0, file->ucontext, &mr_lock_class);
1000 	down_write(&uobj->mutex);
1001 
1002 	pd = idr_read_pd(cmd.pd_handle, file->ucontext);
1003 	if (!pd) {
1004 		ret = -EINVAL;
1005 		goto err_free;
1006 	}
1007 
1008 	if (cmd.access_flags & IB_ACCESS_ON_DEMAND) {
1009 		if (!(pd->device->attrs.device_cap_flags &
1010 		      IB_DEVICE_ON_DEMAND_PAGING)) {
1011 			pr_debug("ODP support not available\n");
1012 			ret = -EINVAL;
1013 			goto err_put;
1014 		}
1015 	}
1016 
1017 	mr = pd->device->reg_user_mr(pd, cmd.start, cmd.length, cmd.hca_va,
1018 				     cmd.access_flags, &udata);
1019 	if (IS_ERR(mr)) {
1020 		ret = PTR_ERR(mr);
1021 		goto err_put;
1022 	}
1023 
1024 	mr->device  = pd->device;
1025 	mr->pd      = pd;
1026 	mr->uobject = uobj;
1027 	atomic_inc(&pd->usecnt);
1028 
1029 	uobj->object = mr;
1030 	ret = idr_add_uobj(&ib_uverbs_mr_idr, uobj);
1031 	if (ret)
1032 		goto err_unreg;
1033 
1034 	memset(&resp, 0, sizeof resp);
1035 	resp.lkey      = mr->lkey;
1036 	resp.rkey      = mr->rkey;
1037 	resp.mr_handle = uobj->id;
1038 
1039 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
1040 			 &resp, sizeof resp)) {
1041 		ret = -EFAULT;
1042 		goto err_copy;
1043 	}
1044 
1045 	put_pd_read(pd);
1046 
1047 	mutex_lock(&file->mutex);
1048 	list_add_tail(&uobj->list, &file->ucontext->mr_list);
1049 	mutex_unlock(&file->mutex);
1050 
1051 	uobj->live = 1;
1052 
1053 	up_write(&uobj->mutex);
1054 
1055 	return in_len;
1056 
1057 err_copy:
1058 	idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
1059 
1060 err_unreg:
1061 	ib_dereg_mr(mr);
1062 
1063 err_put:
1064 	put_pd_read(pd);
1065 
1066 err_free:
1067 	put_uobj_write(uobj);
1068 	return ret;
1069 }
1070 
1071 ssize_t ib_uverbs_rereg_mr(struct ib_uverbs_file *file,
1072 			   struct ib_device *ib_dev,
1073 			   const char __user *buf, int in_len,
1074 			   int out_len)
1075 {
1076 	struct ib_uverbs_rereg_mr      cmd;
1077 	struct ib_uverbs_rereg_mr_resp resp;
1078 	struct ib_udata              udata;
1079 	struct ib_pd                *pd = NULL;
1080 	struct ib_mr                *mr;
1081 	struct ib_pd		    *old_pd;
1082 	int                          ret;
1083 	struct ib_uobject	    *uobj;
1084 
1085 	if (out_len < sizeof(resp))
1086 		return -ENOSPC;
1087 
1088 	if (copy_from_user(&cmd, buf, sizeof(cmd)))
1089 		return -EFAULT;
1090 
1091 	INIT_UDATA(&udata, buf + sizeof(cmd),
1092 		   (unsigned long) cmd.response + sizeof(resp),
1093 		   in_len - sizeof(cmd), out_len - sizeof(resp));
1094 
1095 	if (cmd.flags & ~IB_MR_REREG_SUPPORTED || !cmd.flags)
1096 		return -EINVAL;
1097 
1098 	if ((cmd.flags & IB_MR_REREG_TRANS) &&
1099 	    (!cmd.start || !cmd.hca_va || 0 >= cmd.length ||
1100 	     (cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK)))
1101 			return -EINVAL;
1102 
1103 	uobj = idr_write_uobj(&ib_uverbs_mr_idr, cmd.mr_handle,
1104 			      file->ucontext);
1105 
1106 	if (!uobj)
1107 		return -EINVAL;
1108 
1109 	mr = uobj->object;
1110 
1111 	if (cmd.flags & IB_MR_REREG_ACCESS) {
1112 		ret = ib_check_mr_access(cmd.access_flags);
1113 		if (ret)
1114 			goto put_uobjs;
1115 	}
1116 
1117 	if (cmd.flags & IB_MR_REREG_PD) {
1118 		pd = idr_read_pd(cmd.pd_handle, file->ucontext);
1119 		if (!pd) {
1120 			ret = -EINVAL;
1121 			goto put_uobjs;
1122 		}
1123 	}
1124 
1125 	old_pd = mr->pd;
1126 	ret = mr->device->rereg_user_mr(mr, cmd.flags, cmd.start,
1127 					cmd.length, cmd.hca_va,
1128 					cmd.access_flags, pd, &udata);
1129 	if (!ret) {
1130 		if (cmd.flags & IB_MR_REREG_PD) {
1131 			atomic_inc(&pd->usecnt);
1132 			mr->pd = pd;
1133 			atomic_dec(&old_pd->usecnt);
1134 		}
1135 	} else {
1136 		goto put_uobj_pd;
1137 	}
1138 
1139 	memset(&resp, 0, sizeof(resp));
1140 	resp.lkey      = mr->lkey;
1141 	resp.rkey      = mr->rkey;
1142 
1143 	if (copy_to_user((void __user *)(unsigned long)cmd.response,
1144 			 &resp, sizeof(resp)))
1145 		ret = -EFAULT;
1146 	else
1147 		ret = in_len;
1148 
1149 put_uobj_pd:
1150 	if (cmd.flags & IB_MR_REREG_PD)
1151 		put_pd_read(pd);
1152 
1153 put_uobjs:
1154 
1155 	put_uobj_write(mr->uobject);
1156 
1157 	return ret;
1158 }
1159 
1160 ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
1161 			   struct ib_device *ib_dev,
1162 			   const char __user *buf, int in_len,
1163 			   int out_len)
1164 {
1165 	struct ib_uverbs_dereg_mr cmd;
1166 	struct ib_mr             *mr;
1167 	struct ib_uobject	 *uobj;
1168 	int                       ret = -EINVAL;
1169 
1170 	if (copy_from_user(&cmd, buf, sizeof cmd))
1171 		return -EFAULT;
1172 
1173 	uobj = idr_write_uobj(&ib_uverbs_mr_idr, cmd.mr_handle, file->ucontext);
1174 	if (!uobj)
1175 		return -EINVAL;
1176 
1177 	mr = uobj->object;
1178 
1179 	ret = ib_dereg_mr(mr);
1180 	if (!ret)
1181 		uobj->live = 0;
1182 
1183 	put_uobj_write(uobj);
1184 
1185 	if (ret)
1186 		return ret;
1187 
1188 	idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
1189 
1190 	mutex_lock(&file->mutex);
1191 	list_del(&uobj->list);
1192 	mutex_unlock(&file->mutex);
1193 
1194 	put_uobj(uobj);
1195 
1196 	return in_len;
1197 }
1198 
1199 ssize_t ib_uverbs_alloc_mw(struct ib_uverbs_file *file,
1200 			   struct ib_device *ib_dev,
1201 			   const char __user *buf, int in_len,
1202 			   int out_len)
1203 {
1204 	struct ib_uverbs_alloc_mw      cmd;
1205 	struct ib_uverbs_alloc_mw_resp resp;
1206 	struct ib_uobject             *uobj;
1207 	struct ib_pd                  *pd;
1208 	struct ib_mw                  *mw;
1209 	struct ib_udata		       udata;
1210 	int                            ret;
1211 
1212 	if (out_len < sizeof(resp))
1213 		return -ENOSPC;
1214 
1215 	if (copy_from_user(&cmd, buf, sizeof(cmd)))
1216 		return -EFAULT;
1217 
1218 	uobj = kmalloc(sizeof(*uobj), GFP_KERNEL);
1219 	if (!uobj)
1220 		return -ENOMEM;
1221 
1222 	init_uobj(uobj, 0, file->ucontext, &mw_lock_class);
1223 	down_write(&uobj->mutex);
1224 
1225 	pd = idr_read_pd(cmd.pd_handle, file->ucontext);
1226 	if (!pd) {
1227 		ret = -EINVAL;
1228 		goto err_free;
1229 	}
1230 
1231 	INIT_UDATA(&udata, buf + sizeof(cmd),
1232 		   (unsigned long)cmd.response + sizeof(resp),
1233 		   in_len - sizeof(cmd) - sizeof(struct ib_uverbs_cmd_hdr),
1234 		   out_len - sizeof(resp));
1235 
1236 	mw = pd->device->alloc_mw(pd, cmd.mw_type, &udata);
1237 	if (IS_ERR(mw)) {
1238 		ret = PTR_ERR(mw);
1239 		goto err_put;
1240 	}
1241 
1242 	mw->device  = pd->device;
1243 	mw->pd      = pd;
1244 	mw->uobject = uobj;
1245 	atomic_inc(&pd->usecnt);
1246 
1247 	uobj->object = mw;
1248 	ret = idr_add_uobj(&ib_uverbs_mw_idr, uobj);
1249 	if (ret)
1250 		goto err_unalloc;
1251 
1252 	memset(&resp, 0, sizeof(resp));
1253 	resp.rkey      = mw->rkey;
1254 	resp.mw_handle = uobj->id;
1255 
1256 	if (copy_to_user((void __user *)(unsigned long)cmd.response,
1257 			 &resp, sizeof(resp))) {
1258 		ret = -EFAULT;
1259 		goto err_copy;
1260 	}
1261 
1262 	put_pd_read(pd);
1263 
1264 	mutex_lock(&file->mutex);
1265 	list_add_tail(&uobj->list, &file->ucontext->mw_list);
1266 	mutex_unlock(&file->mutex);
1267 
1268 	uobj->live = 1;
1269 
1270 	up_write(&uobj->mutex);
1271 
1272 	return in_len;
1273 
1274 err_copy:
1275 	idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
1276 
1277 err_unalloc:
1278 	uverbs_dealloc_mw(mw);
1279 
1280 err_put:
1281 	put_pd_read(pd);
1282 
1283 err_free:
1284 	put_uobj_write(uobj);
1285 	return ret;
1286 }
1287 
1288 ssize_t ib_uverbs_dealloc_mw(struct ib_uverbs_file *file,
1289 			     struct ib_device *ib_dev,
1290 			     const char __user *buf, int in_len,
1291 			     int out_len)
1292 {
1293 	struct ib_uverbs_dealloc_mw cmd;
1294 	struct ib_mw               *mw;
1295 	struct ib_uobject	   *uobj;
1296 	int                         ret = -EINVAL;
1297 
1298 	if (copy_from_user(&cmd, buf, sizeof(cmd)))
1299 		return -EFAULT;
1300 
1301 	uobj = idr_write_uobj(&ib_uverbs_mw_idr, cmd.mw_handle, file->ucontext);
1302 	if (!uobj)
1303 		return -EINVAL;
1304 
1305 	mw = uobj->object;
1306 
1307 	ret = uverbs_dealloc_mw(mw);
1308 	if (!ret)
1309 		uobj->live = 0;
1310 
1311 	put_uobj_write(uobj);
1312 
1313 	if (ret)
1314 		return ret;
1315 
1316 	idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
1317 
1318 	mutex_lock(&file->mutex);
1319 	list_del(&uobj->list);
1320 	mutex_unlock(&file->mutex);
1321 
1322 	put_uobj(uobj);
1323 
1324 	return in_len;
1325 }
1326 
1327 ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
1328 				      struct ib_device *ib_dev,
1329 				      const char __user *buf, int in_len,
1330 				      int out_len)
1331 {
1332 	struct ib_uverbs_create_comp_channel	   cmd;
1333 	struct ib_uverbs_create_comp_channel_resp  resp;
1334 	struct file				  *filp;
1335 	int ret;
1336 
1337 	if (out_len < sizeof resp)
1338 		return -ENOSPC;
1339 
1340 	if (copy_from_user(&cmd, buf, sizeof cmd))
1341 		return -EFAULT;
1342 
1343 	ret = get_unused_fd_flags(O_CLOEXEC);
1344 	if (ret < 0)
1345 		return ret;
1346 	resp.fd = ret;
1347 
1348 	filp = ib_uverbs_alloc_event_file(file, ib_dev, 0);
1349 	if (IS_ERR(filp)) {
1350 		put_unused_fd(resp.fd);
1351 		return PTR_ERR(filp);
1352 	}
1353 
1354 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
1355 			 &resp, sizeof resp)) {
1356 		put_unused_fd(resp.fd);
1357 		fput(filp);
1358 		return -EFAULT;
1359 	}
1360 
1361 	fd_install(resp.fd, filp);
1362 	return in_len;
1363 }
1364 
1365 static struct ib_ucq_object *create_cq(struct ib_uverbs_file *file,
1366 					struct ib_device *ib_dev,
1367 				       struct ib_udata *ucore,
1368 				       struct ib_udata *uhw,
1369 				       struct ib_uverbs_ex_create_cq *cmd,
1370 				       size_t cmd_sz,
1371 				       int (*cb)(struct ib_uverbs_file *file,
1372 						 struct ib_ucq_object *obj,
1373 						 struct ib_uverbs_ex_create_cq_resp *resp,
1374 						 struct ib_udata *udata,
1375 						 void *context),
1376 				       void *context)
1377 {
1378 	struct ib_ucq_object           *obj;
1379 	struct ib_uverbs_event_file    *ev_file = NULL;
1380 	struct ib_cq                   *cq;
1381 	int                             ret;
1382 	struct ib_uverbs_ex_create_cq_resp resp;
1383 	struct ib_cq_init_attr attr = {};
1384 
1385 	if (cmd->comp_vector >= file->device->num_comp_vectors)
1386 		return ERR_PTR(-EINVAL);
1387 
1388 	obj = kmalloc(sizeof *obj, GFP_KERNEL);
1389 	if (!obj)
1390 		return ERR_PTR(-ENOMEM);
1391 
1392 	init_uobj(&obj->uobject, cmd->user_handle, file->ucontext, &cq_lock_class);
1393 	down_write(&obj->uobject.mutex);
1394 
1395 	if (cmd->comp_channel >= 0) {
1396 		ev_file = ib_uverbs_lookup_comp_file(cmd->comp_channel);
1397 		if (!ev_file) {
1398 			ret = -EINVAL;
1399 			goto err;
1400 		}
1401 	}
1402 
1403 	obj->uverbs_file	   = file;
1404 	obj->comp_events_reported  = 0;
1405 	obj->async_events_reported = 0;
1406 	INIT_LIST_HEAD(&obj->comp_list);
1407 	INIT_LIST_HEAD(&obj->async_list);
1408 
1409 	attr.cqe = cmd->cqe;
1410 	attr.comp_vector = cmd->comp_vector;
1411 
1412 	if (cmd_sz > offsetof(typeof(*cmd), flags) + sizeof(cmd->flags))
1413 		attr.flags = cmd->flags;
1414 
1415 	cq = ib_dev->create_cq(ib_dev, &attr,
1416 					     file->ucontext, uhw);
1417 	if (IS_ERR(cq)) {
1418 		ret = PTR_ERR(cq);
1419 		goto err_file;
1420 	}
1421 
1422 	cq->device        = ib_dev;
1423 	cq->uobject       = &obj->uobject;
1424 	cq->comp_handler  = ib_uverbs_comp_handler;
1425 	cq->event_handler = ib_uverbs_cq_event_handler;
1426 	cq->cq_context    = ev_file;
1427 	atomic_set(&cq->usecnt, 0);
1428 
1429 	obj->uobject.object = cq;
1430 	ret = idr_add_uobj(&ib_uverbs_cq_idr, &obj->uobject);
1431 	if (ret)
1432 		goto err_free;
1433 
1434 	memset(&resp, 0, sizeof resp);
1435 	resp.base.cq_handle = obj->uobject.id;
1436 	resp.base.cqe       = cq->cqe;
1437 
1438 	resp.response_length = offsetof(typeof(resp), response_length) +
1439 		sizeof(resp.response_length);
1440 
1441 	ret = cb(file, obj, &resp, ucore, context);
1442 	if (ret)
1443 		goto err_cb;
1444 
1445 	mutex_lock(&file->mutex);
1446 	list_add_tail(&obj->uobject.list, &file->ucontext->cq_list);
1447 	mutex_unlock(&file->mutex);
1448 
1449 	obj->uobject.live = 1;
1450 
1451 	up_write(&obj->uobject.mutex);
1452 
1453 	return obj;
1454 
1455 err_cb:
1456 	idr_remove_uobj(&ib_uverbs_cq_idr, &obj->uobject);
1457 
1458 err_free:
1459 	ib_destroy_cq(cq);
1460 
1461 err_file:
1462 	if (ev_file)
1463 		ib_uverbs_release_ucq(file, ev_file, obj);
1464 
1465 err:
1466 	put_uobj_write(&obj->uobject);
1467 
1468 	return ERR_PTR(ret);
1469 }
1470 
1471 static int ib_uverbs_create_cq_cb(struct ib_uverbs_file *file,
1472 				  struct ib_ucq_object *obj,
1473 				  struct ib_uverbs_ex_create_cq_resp *resp,
1474 				  struct ib_udata *ucore, void *context)
1475 {
1476 	if (ib_copy_to_udata(ucore, &resp->base, sizeof(resp->base)))
1477 		return -EFAULT;
1478 
1479 	return 0;
1480 }
1481 
1482 ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
1483 			    struct ib_device *ib_dev,
1484 			    const char __user *buf, int in_len,
1485 			    int out_len)
1486 {
1487 	struct ib_uverbs_create_cq      cmd;
1488 	struct ib_uverbs_ex_create_cq	cmd_ex;
1489 	struct ib_uverbs_create_cq_resp resp;
1490 	struct ib_udata                 ucore;
1491 	struct ib_udata                 uhw;
1492 	struct ib_ucq_object           *obj;
1493 
1494 	if (out_len < sizeof(resp))
1495 		return -ENOSPC;
1496 
1497 	if (copy_from_user(&cmd, buf, sizeof(cmd)))
1498 		return -EFAULT;
1499 
1500 	INIT_UDATA(&ucore, buf, (unsigned long)cmd.response, sizeof(cmd), sizeof(resp));
1501 
1502 	INIT_UDATA(&uhw, buf + sizeof(cmd),
1503 		   (unsigned long)cmd.response + sizeof(resp),
1504 		   in_len - sizeof(cmd), out_len - sizeof(resp));
1505 
1506 	memset(&cmd_ex, 0, sizeof(cmd_ex));
1507 	cmd_ex.user_handle = cmd.user_handle;
1508 	cmd_ex.cqe = cmd.cqe;
1509 	cmd_ex.comp_vector = cmd.comp_vector;
1510 	cmd_ex.comp_channel = cmd.comp_channel;
1511 
1512 	obj = create_cq(file, ib_dev, &ucore, &uhw, &cmd_ex,
1513 			offsetof(typeof(cmd_ex), comp_channel) +
1514 			sizeof(cmd.comp_channel), ib_uverbs_create_cq_cb,
1515 			NULL);
1516 
1517 	if (IS_ERR(obj))
1518 		return PTR_ERR(obj);
1519 
1520 	return in_len;
1521 }
1522 
1523 static int ib_uverbs_ex_create_cq_cb(struct ib_uverbs_file *file,
1524 				     struct ib_ucq_object *obj,
1525 				     struct ib_uverbs_ex_create_cq_resp *resp,
1526 				     struct ib_udata *ucore, void *context)
1527 {
1528 	if (ib_copy_to_udata(ucore, resp, resp->response_length))
1529 		return -EFAULT;
1530 
1531 	return 0;
1532 }
1533 
1534 int ib_uverbs_ex_create_cq(struct ib_uverbs_file *file,
1535 			 struct ib_device *ib_dev,
1536 			   struct ib_udata *ucore,
1537 			   struct ib_udata *uhw)
1538 {
1539 	struct ib_uverbs_ex_create_cq_resp resp;
1540 	struct ib_uverbs_ex_create_cq  cmd;
1541 	struct ib_ucq_object           *obj;
1542 	int err;
1543 
1544 	if (ucore->inlen < sizeof(cmd))
1545 		return -EINVAL;
1546 
1547 	err = ib_copy_from_udata(&cmd, ucore, sizeof(cmd));
1548 	if (err)
1549 		return err;
1550 
1551 	if (cmd.comp_mask)
1552 		return -EINVAL;
1553 
1554 	if (cmd.reserved)
1555 		return -EINVAL;
1556 
1557 	if (ucore->outlen < (offsetof(typeof(resp), response_length) +
1558 			     sizeof(resp.response_length)))
1559 		return -ENOSPC;
1560 
1561 	obj = create_cq(file, ib_dev, ucore, uhw, &cmd,
1562 			min(ucore->inlen, sizeof(cmd)),
1563 			ib_uverbs_ex_create_cq_cb, NULL);
1564 
1565 	if (IS_ERR(obj))
1566 		return PTR_ERR(obj);
1567 
1568 	return 0;
1569 }
1570 
1571 ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
1572 			    struct ib_device *ib_dev,
1573 			    const char __user *buf, int in_len,
1574 			    int out_len)
1575 {
1576 	struct ib_uverbs_resize_cq	cmd;
1577 	struct ib_uverbs_resize_cq_resp	resp;
1578 	struct ib_udata                 udata;
1579 	struct ib_cq			*cq;
1580 	int				ret = -EINVAL;
1581 
1582 	if (copy_from_user(&cmd, buf, sizeof cmd))
1583 		return -EFAULT;
1584 
1585 	INIT_UDATA(&udata, buf + sizeof cmd,
1586 		   (unsigned long) cmd.response + sizeof resp,
1587 		   in_len - sizeof cmd, out_len - sizeof resp);
1588 
1589 	cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
1590 	if (!cq)
1591 		return -EINVAL;
1592 
1593 	ret = cq->device->resize_cq(cq, cmd.cqe, &udata);
1594 	if (ret)
1595 		goto out;
1596 
1597 	resp.cqe = cq->cqe;
1598 
1599 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
1600 			 &resp, sizeof resp.cqe))
1601 		ret = -EFAULT;
1602 
1603 out:
1604 	put_cq_read(cq);
1605 
1606 	return ret ? ret : in_len;
1607 }
1608 
1609 static int copy_wc_to_user(void __user *dest, struct ib_wc *wc)
1610 {
1611 	struct ib_uverbs_wc tmp;
1612 
1613 	tmp.wr_id		= wc->wr_id;
1614 	tmp.status		= wc->status;
1615 	tmp.opcode		= wc->opcode;
1616 	tmp.vendor_err		= wc->vendor_err;
1617 	tmp.byte_len		= wc->byte_len;
1618 	tmp.ex.imm_data		= (__u32 __force) wc->ex.imm_data;
1619 	tmp.qp_num		= wc->qp->qp_num;
1620 	tmp.src_qp		= wc->src_qp;
1621 	tmp.wc_flags		= wc->wc_flags;
1622 	tmp.pkey_index		= wc->pkey_index;
1623 	tmp.slid		= wc->slid;
1624 	tmp.sl			= wc->sl;
1625 	tmp.dlid_path_bits	= wc->dlid_path_bits;
1626 	tmp.port_num		= wc->port_num;
1627 	tmp.reserved		= 0;
1628 
1629 	if (copy_to_user(dest, &tmp, sizeof tmp))
1630 		return -EFAULT;
1631 
1632 	return 0;
1633 }
1634 
1635 ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
1636 			  struct ib_device *ib_dev,
1637 			  const char __user *buf, int in_len,
1638 			  int out_len)
1639 {
1640 	struct ib_uverbs_poll_cq       cmd;
1641 	struct ib_uverbs_poll_cq_resp  resp;
1642 	u8 __user                     *header_ptr;
1643 	u8 __user                     *data_ptr;
1644 	struct ib_cq                  *cq;
1645 	struct ib_wc                   wc;
1646 	int                            ret;
1647 
1648 	if (copy_from_user(&cmd, buf, sizeof cmd))
1649 		return -EFAULT;
1650 
1651 	cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
1652 	if (!cq)
1653 		return -EINVAL;
1654 
1655 	/* we copy a struct ib_uverbs_poll_cq_resp to user space */
1656 	header_ptr = (void __user *)(unsigned long) cmd.response;
1657 	data_ptr = header_ptr + sizeof resp;
1658 
1659 	memset(&resp, 0, sizeof resp);
1660 	while (resp.count < cmd.ne) {
1661 		ret = ib_poll_cq(cq, 1, &wc);
1662 		if (ret < 0)
1663 			goto out_put;
1664 		if (!ret)
1665 			break;
1666 
1667 		ret = copy_wc_to_user(data_ptr, &wc);
1668 		if (ret)
1669 			goto out_put;
1670 
1671 		data_ptr += sizeof(struct ib_uverbs_wc);
1672 		++resp.count;
1673 	}
1674 
1675 	if (copy_to_user(header_ptr, &resp, sizeof resp)) {
1676 		ret = -EFAULT;
1677 		goto out_put;
1678 	}
1679 
1680 	ret = in_len;
1681 
1682 out_put:
1683 	put_cq_read(cq);
1684 	return ret;
1685 }
1686 
1687 ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file,
1688 				struct ib_device *ib_dev,
1689 				const char __user *buf, int in_len,
1690 				int out_len)
1691 {
1692 	struct ib_uverbs_req_notify_cq cmd;
1693 	struct ib_cq                  *cq;
1694 
1695 	if (copy_from_user(&cmd, buf, sizeof cmd))
1696 		return -EFAULT;
1697 
1698 	cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
1699 	if (!cq)
1700 		return -EINVAL;
1701 
1702 	ib_req_notify_cq(cq, cmd.solicited_only ?
1703 			 IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
1704 
1705 	put_cq_read(cq);
1706 
1707 	return in_len;
1708 }
1709 
1710 ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
1711 			     struct ib_device *ib_dev,
1712 			     const char __user *buf, int in_len,
1713 			     int out_len)
1714 {
1715 	struct ib_uverbs_destroy_cq      cmd;
1716 	struct ib_uverbs_destroy_cq_resp resp;
1717 	struct ib_uobject		*uobj;
1718 	struct ib_cq               	*cq;
1719 	struct ib_ucq_object        	*obj;
1720 	struct ib_uverbs_event_file	*ev_file;
1721 	int                        	 ret = -EINVAL;
1722 
1723 	if (copy_from_user(&cmd, buf, sizeof cmd))
1724 		return -EFAULT;
1725 
1726 	uobj = idr_write_uobj(&ib_uverbs_cq_idr, cmd.cq_handle, file->ucontext);
1727 	if (!uobj)
1728 		return -EINVAL;
1729 	cq      = uobj->object;
1730 	ev_file = cq->cq_context;
1731 	obj     = container_of(cq->uobject, struct ib_ucq_object, uobject);
1732 
1733 	ret = ib_destroy_cq(cq);
1734 	if (!ret)
1735 		uobj->live = 0;
1736 
1737 	put_uobj_write(uobj);
1738 
1739 	if (ret)
1740 		return ret;
1741 
1742 	idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
1743 
1744 	mutex_lock(&file->mutex);
1745 	list_del(&uobj->list);
1746 	mutex_unlock(&file->mutex);
1747 
1748 	ib_uverbs_release_ucq(file, ev_file, obj);
1749 
1750 	memset(&resp, 0, sizeof resp);
1751 	resp.comp_events_reported  = obj->comp_events_reported;
1752 	resp.async_events_reported = obj->async_events_reported;
1753 
1754 	put_uobj(uobj);
1755 
1756 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
1757 			 &resp, sizeof resp))
1758 		return -EFAULT;
1759 
1760 	return in_len;
1761 }
1762 
1763 static int create_qp(struct ib_uverbs_file *file,
1764 		     struct ib_udata *ucore,
1765 		     struct ib_udata *uhw,
1766 		     struct ib_uverbs_ex_create_qp *cmd,
1767 		     size_t cmd_sz,
1768 		     int (*cb)(struct ib_uverbs_file *file,
1769 			       struct ib_uverbs_ex_create_qp_resp *resp,
1770 			       struct ib_udata *udata),
1771 		     void *context)
1772 {
1773 	struct ib_uqp_object		*obj;
1774 	struct ib_device		*device;
1775 	struct ib_pd			*pd = NULL;
1776 	struct ib_xrcd			*xrcd = NULL;
1777 	struct ib_uobject		*uninitialized_var(xrcd_uobj);
1778 	struct ib_cq			*scq = NULL, *rcq = NULL;
1779 	struct ib_srq			*srq = NULL;
1780 	struct ib_qp			*qp;
1781 	char				*buf;
1782 	struct ib_qp_init_attr		attr = {};
1783 	struct ib_uverbs_ex_create_qp_resp resp;
1784 	int				ret;
1785 	struct ib_rwq_ind_table *ind_tbl = NULL;
1786 	bool has_sq = true;
1787 
1788 	if (cmd->qp_type == IB_QPT_RAW_PACKET && priv_check(curthread, PRIV_NET_RAW) != 0)
1789 		return -EPERM;
1790 
1791 	obj = kzalloc(sizeof *obj, GFP_KERNEL);
1792 	if (!obj)
1793 		return -ENOMEM;
1794 
1795 	init_uobj(&obj->uevent.uobject, cmd->user_handle, file->ucontext,
1796 		  &qp_lock_class);
1797 	down_write(&obj->uevent.uobject.mutex);
1798 	if (cmd_sz >= offsetof(typeof(*cmd), rwq_ind_tbl_handle) +
1799 		      sizeof(cmd->rwq_ind_tbl_handle) &&
1800 		      (cmd->comp_mask & IB_UVERBS_CREATE_QP_MASK_IND_TABLE)) {
1801 		ind_tbl = idr_read_rwq_indirection_table(cmd->rwq_ind_tbl_handle,
1802 							 file->ucontext);
1803 		if (!ind_tbl) {
1804 			ret = -EINVAL;
1805 			goto err_put;
1806 		}
1807 
1808 		attr.rwq_ind_tbl = ind_tbl;
1809 	}
1810 
1811 	if ((cmd_sz >= offsetof(typeof(*cmd), reserved1) +
1812 		       sizeof(cmd->reserved1)) && cmd->reserved1) {
1813 		ret = -EOPNOTSUPP;
1814 		goto err_put;
1815 	}
1816 
1817 	if (ind_tbl && (cmd->max_recv_wr || cmd->max_recv_sge || cmd->is_srq)) {
1818 		ret = -EINVAL;
1819 		goto err_put;
1820 	}
1821 
1822 	if (ind_tbl && !cmd->max_send_wr)
1823 		has_sq = false;
1824 
1825 	if (cmd->qp_type == IB_QPT_XRC_TGT) {
1826 		xrcd = idr_read_xrcd(cmd->pd_handle, file->ucontext,
1827 				     &xrcd_uobj);
1828 		if (!xrcd) {
1829 			ret = -EINVAL;
1830 			goto err_put;
1831 		}
1832 		device = xrcd->device;
1833 	} else {
1834 		if (cmd->qp_type == IB_QPT_XRC_INI) {
1835 			cmd->max_recv_wr = 0;
1836 			cmd->max_recv_sge = 0;
1837 		} else {
1838 			if (cmd->is_srq) {
1839 				srq = idr_read_srq(cmd->srq_handle,
1840 						   file->ucontext);
1841 				if (!srq || srq->srq_type != IB_SRQT_BASIC) {
1842 					ret = -EINVAL;
1843 					goto err_put;
1844 				}
1845 			}
1846 
1847 			if (!ind_tbl) {
1848 				if (cmd->recv_cq_handle != cmd->send_cq_handle) {
1849 					rcq = idr_read_cq(cmd->recv_cq_handle,
1850 							  file->ucontext, 0);
1851 					if (!rcq) {
1852 						ret = -EINVAL;
1853 						goto err_put;
1854 					}
1855 				}
1856 			}
1857 		}
1858 
1859 		if (has_sq)
1860 			scq = idr_read_cq(cmd->send_cq_handle, file->ucontext, !!rcq);
1861 		if (!ind_tbl)
1862 			rcq = rcq ?: scq;
1863 		pd  = idr_read_pd(cmd->pd_handle, file->ucontext);
1864 		if (!pd || (!scq && has_sq)) {
1865 			ret = -EINVAL;
1866 			goto err_put;
1867 		}
1868 
1869 		device = pd->device;
1870 	}
1871 
1872 	attr.event_handler = ib_uverbs_qp_event_handler;
1873 	attr.qp_context    = file;
1874 	attr.send_cq       = scq;
1875 	attr.recv_cq       = rcq;
1876 	attr.srq           = srq;
1877 	attr.xrcd	   = xrcd;
1878 	attr.sq_sig_type   = cmd->sq_sig_all ? IB_SIGNAL_ALL_WR :
1879 					      IB_SIGNAL_REQ_WR;
1880 	attr.qp_type       = cmd->qp_type;
1881 	attr.create_flags  = 0;
1882 
1883 	attr.cap.max_send_wr     = cmd->max_send_wr;
1884 	attr.cap.max_recv_wr     = cmd->max_recv_wr;
1885 	attr.cap.max_send_sge    = cmd->max_send_sge;
1886 	attr.cap.max_recv_sge    = cmd->max_recv_sge;
1887 	attr.cap.max_inline_data = cmd->max_inline_data;
1888 
1889 	obj->uevent.events_reported     = 0;
1890 	INIT_LIST_HEAD(&obj->uevent.event_list);
1891 	INIT_LIST_HEAD(&obj->mcast_list);
1892 
1893 	if (cmd_sz >= offsetof(typeof(*cmd), create_flags) +
1894 		      sizeof(cmd->create_flags))
1895 		attr.create_flags = cmd->create_flags;
1896 
1897 	if (attr.create_flags & ~(IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK |
1898 				IB_QP_CREATE_CROSS_CHANNEL |
1899 				IB_QP_CREATE_MANAGED_SEND |
1900 				IB_QP_CREATE_MANAGED_RECV |
1901 				IB_QP_CREATE_SCATTER_FCS)) {
1902 		ret = -EINVAL;
1903 		goto err_put;
1904 	}
1905 
1906 	buf = (char *)cmd + sizeof(*cmd);
1907 	if (cmd_sz > sizeof(*cmd))
1908 		if (!(buf[0] == 0 && !memcmp(buf, buf + 1,
1909 					     cmd_sz - sizeof(*cmd) - 1))) {
1910 			ret = -EINVAL;
1911 			goto err_put;
1912 		}
1913 
1914 	if (cmd->qp_type == IB_QPT_XRC_TGT)
1915 		qp = ib_create_qp(pd, &attr);
1916 	else
1917 		qp = device->create_qp(pd, &attr, uhw);
1918 
1919 	if (IS_ERR(qp)) {
1920 		ret = PTR_ERR(qp);
1921 		goto err_put;
1922 	}
1923 
1924 	if (cmd->qp_type != IB_QPT_XRC_TGT) {
1925 		qp->real_qp	  = qp;
1926 		qp->device	  = device;
1927 		qp->pd		  = pd;
1928 		qp->send_cq	  = attr.send_cq;
1929 		qp->recv_cq	  = attr.recv_cq;
1930 		qp->srq		  = attr.srq;
1931 		qp->rwq_ind_tbl	  = ind_tbl;
1932 		qp->event_handler = attr.event_handler;
1933 		qp->qp_context	  = attr.qp_context;
1934 		qp->qp_type	  = attr.qp_type;
1935 		atomic_set(&qp->usecnt, 0);
1936 		atomic_inc(&pd->usecnt);
1937 		if (attr.send_cq)
1938 			atomic_inc(&attr.send_cq->usecnt);
1939 		if (attr.recv_cq)
1940 			atomic_inc(&attr.recv_cq->usecnt);
1941 		if (attr.srq)
1942 			atomic_inc(&attr.srq->usecnt);
1943 		if (ind_tbl)
1944 			atomic_inc(&ind_tbl->usecnt);
1945 	}
1946 	qp->uobject = &obj->uevent.uobject;
1947 
1948 	obj->uevent.uobject.object = qp;
1949 	ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1950 	if (ret)
1951 		goto err_destroy;
1952 
1953 	memset(&resp, 0, sizeof resp);
1954 	resp.base.qpn             = qp->qp_num;
1955 	resp.base.qp_handle       = obj->uevent.uobject.id;
1956 	resp.base.max_recv_sge    = attr.cap.max_recv_sge;
1957 	resp.base.max_send_sge    = attr.cap.max_send_sge;
1958 	resp.base.max_recv_wr     = attr.cap.max_recv_wr;
1959 	resp.base.max_send_wr     = attr.cap.max_send_wr;
1960 	resp.base.max_inline_data = attr.cap.max_inline_data;
1961 
1962 	resp.response_length = offsetof(typeof(resp), response_length) +
1963 			       sizeof(resp.response_length);
1964 
1965 	ret = cb(file, &resp, ucore);
1966 	if (ret)
1967 		goto err_cb;
1968 
1969 	if (xrcd) {
1970 		obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object,
1971 					  uobject);
1972 		atomic_inc(&obj->uxrcd->refcnt);
1973 		put_xrcd_read(xrcd_uobj);
1974 	}
1975 
1976 	if (pd)
1977 		put_pd_read(pd);
1978 	if (scq)
1979 		put_cq_read(scq);
1980 	if (rcq && rcq != scq)
1981 		put_cq_read(rcq);
1982 	if (srq)
1983 		put_srq_read(srq);
1984 	if (ind_tbl)
1985 		put_rwq_indirection_table_read(ind_tbl);
1986 
1987 	mutex_lock(&file->mutex);
1988 	list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1989 	mutex_unlock(&file->mutex);
1990 
1991 	obj->uevent.uobject.live = 1;
1992 
1993 	up_write(&obj->uevent.uobject.mutex);
1994 
1995 	return 0;
1996 err_cb:
1997 	idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1998 
1999 err_destroy:
2000 	ib_destroy_qp(qp);
2001 
2002 err_put:
2003 	if (xrcd)
2004 		put_xrcd_read(xrcd_uobj);
2005 	if (pd)
2006 		put_pd_read(pd);
2007 	if (scq)
2008 		put_cq_read(scq);
2009 	if (rcq && rcq != scq)
2010 		put_cq_read(rcq);
2011 	if (srq)
2012 		put_srq_read(srq);
2013 	if (ind_tbl)
2014 		put_rwq_indirection_table_read(ind_tbl);
2015 
2016 	put_uobj_write(&obj->uevent.uobject);
2017 	return ret;
2018 }
2019 
2020 static int ib_uverbs_create_qp_cb(struct ib_uverbs_file *file,
2021 				  struct ib_uverbs_ex_create_qp_resp *resp,
2022 				  struct ib_udata *ucore)
2023 {
2024 	if (ib_copy_to_udata(ucore, &resp->base, sizeof(resp->base)))
2025 		return -EFAULT;
2026 
2027 	return 0;
2028 }
2029 
2030 ssize_t ib_uverbs_create_qp(struct ib_uverbs_file *file,
2031 			    struct ib_device *ib_dev,
2032 			    const char __user *buf, int in_len,
2033 			    int out_len)
2034 {
2035 	struct ib_uverbs_create_qp      cmd;
2036 	struct ib_uverbs_ex_create_qp	cmd_ex;
2037 	struct ib_udata			ucore;
2038 	struct ib_udata			uhw;
2039 	ssize_t resp_size = sizeof(struct ib_uverbs_create_qp_resp);
2040 	int				err;
2041 
2042 	if (out_len < resp_size)
2043 		return -ENOSPC;
2044 
2045 	if (copy_from_user(&cmd, buf, sizeof(cmd)))
2046 		return -EFAULT;
2047 
2048 	INIT_UDATA(&ucore, buf, (unsigned long)cmd.response, sizeof(cmd),
2049 		   resp_size);
2050 	INIT_UDATA(&uhw, buf + sizeof(cmd),
2051 		   (unsigned long)cmd.response + resp_size,
2052 		   in_len - sizeof(cmd) - sizeof(struct ib_uverbs_cmd_hdr),
2053 		   out_len - resp_size);
2054 
2055 	memset(&cmd_ex, 0, sizeof(cmd_ex));
2056 	cmd_ex.user_handle = cmd.user_handle;
2057 	cmd_ex.pd_handle = cmd.pd_handle;
2058 	cmd_ex.send_cq_handle = cmd.send_cq_handle;
2059 	cmd_ex.recv_cq_handle = cmd.recv_cq_handle;
2060 	cmd_ex.srq_handle = cmd.srq_handle;
2061 	cmd_ex.max_send_wr = cmd.max_send_wr;
2062 	cmd_ex.max_recv_wr = cmd.max_recv_wr;
2063 	cmd_ex.max_send_sge = cmd.max_send_sge;
2064 	cmd_ex.max_recv_sge = cmd.max_recv_sge;
2065 	cmd_ex.max_inline_data = cmd.max_inline_data;
2066 	cmd_ex.sq_sig_all = cmd.sq_sig_all;
2067 	cmd_ex.qp_type = cmd.qp_type;
2068 	cmd_ex.is_srq = cmd.is_srq;
2069 
2070 	err = create_qp(file, &ucore, &uhw, &cmd_ex,
2071 			offsetof(typeof(cmd_ex), is_srq) +
2072 			sizeof(cmd.is_srq), ib_uverbs_create_qp_cb,
2073 			NULL);
2074 
2075 	if (err)
2076 		return err;
2077 
2078 	return in_len;
2079 }
2080 
2081 static int ib_uverbs_ex_create_qp_cb(struct ib_uverbs_file *file,
2082 				     struct ib_uverbs_ex_create_qp_resp *resp,
2083 				     struct ib_udata *ucore)
2084 {
2085 	if (ib_copy_to_udata(ucore, resp, resp->response_length))
2086 		return -EFAULT;
2087 
2088 	return 0;
2089 }
2090 
2091 int ib_uverbs_ex_create_qp(struct ib_uverbs_file *file,
2092 			   struct ib_device *ib_dev,
2093 			   struct ib_udata *ucore,
2094 			   struct ib_udata *uhw)
2095 {
2096 	struct ib_uverbs_ex_create_qp_resp resp;
2097 	struct ib_uverbs_ex_create_qp cmd = {0};
2098 	int err;
2099 
2100 	if (ucore->inlen < (offsetof(typeof(cmd), comp_mask) +
2101 			    sizeof(cmd.comp_mask)))
2102 		return -EINVAL;
2103 
2104 	err = ib_copy_from_udata(&cmd, ucore, min(sizeof(cmd), ucore->inlen));
2105 	if (err)
2106 		return err;
2107 
2108 	if (cmd.comp_mask & ~IB_UVERBS_CREATE_QP_SUP_COMP_MASK)
2109 		return -EINVAL;
2110 
2111 	if (cmd.reserved)
2112 		return -EINVAL;
2113 
2114 	if (ucore->outlen < (offsetof(typeof(resp), response_length) +
2115 			     sizeof(resp.response_length)))
2116 		return -ENOSPC;
2117 
2118 	err = create_qp(file, ucore, uhw, &cmd,
2119 			min(ucore->inlen, sizeof(cmd)),
2120 			ib_uverbs_ex_create_qp_cb, NULL);
2121 
2122 	if (err)
2123 		return err;
2124 
2125 	return 0;
2126 }
2127 
2128 ssize_t ib_uverbs_open_qp(struct ib_uverbs_file *file,
2129 			  struct ib_device *ib_dev,
2130 			  const char __user *buf, int in_len, int out_len)
2131 {
2132 	struct ib_uverbs_open_qp        cmd;
2133 	struct ib_uverbs_create_qp_resp resp;
2134 	struct ib_udata                 udata;
2135 	struct ib_uqp_object           *obj;
2136 	struct ib_xrcd		       *xrcd;
2137 	struct ib_uobject	       *uninitialized_var(xrcd_uobj);
2138 	struct ib_qp                   *qp;
2139 	struct ib_qp_open_attr          attr;
2140 	int ret;
2141 
2142 	if (out_len < sizeof resp)
2143 		return -ENOSPC;
2144 
2145 	if (copy_from_user(&cmd, buf, sizeof cmd))
2146 		return -EFAULT;
2147 
2148 	INIT_UDATA(&udata, buf + sizeof cmd,
2149 		   (unsigned long) cmd.response + sizeof resp,
2150 		   in_len - sizeof cmd, out_len - sizeof resp);
2151 
2152 	obj = kmalloc(sizeof *obj, GFP_KERNEL);
2153 	if (!obj)
2154 		return -ENOMEM;
2155 
2156 	init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_class);
2157 	down_write(&obj->uevent.uobject.mutex);
2158 
2159 	xrcd = idr_read_xrcd(cmd.pd_handle, file->ucontext, &xrcd_uobj);
2160 	if (!xrcd) {
2161 		ret = -EINVAL;
2162 		goto err_put;
2163 	}
2164 
2165 	attr.event_handler = ib_uverbs_qp_event_handler;
2166 	attr.qp_context    = file;
2167 	attr.qp_num        = cmd.qpn;
2168 	attr.qp_type       = cmd.qp_type;
2169 
2170 	obj->uevent.events_reported = 0;
2171 	INIT_LIST_HEAD(&obj->uevent.event_list);
2172 	INIT_LIST_HEAD(&obj->mcast_list);
2173 
2174 	qp = ib_open_qp(xrcd, &attr);
2175 	if (IS_ERR(qp)) {
2176 		ret = PTR_ERR(qp);
2177 		goto err_put;
2178 	}
2179 
2180 	qp->uobject = &obj->uevent.uobject;
2181 
2182 	obj->uevent.uobject.object = qp;
2183 	ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
2184 	if (ret)
2185 		goto err_destroy;
2186 
2187 	memset(&resp, 0, sizeof resp);
2188 	resp.qpn       = qp->qp_num;
2189 	resp.qp_handle = obj->uevent.uobject.id;
2190 
2191 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
2192 			 &resp, sizeof resp)) {
2193 		ret = -EFAULT;
2194 		goto err_remove;
2195 	}
2196 
2197 	obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, uobject);
2198 	atomic_inc(&obj->uxrcd->refcnt);
2199 	put_xrcd_read(xrcd_uobj);
2200 
2201 	mutex_lock(&file->mutex);
2202 	list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
2203 	mutex_unlock(&file->mutex);
2204 
2205 	obj->uevent.uobject.live = 1;
2206 
2207 	up_write(&obj->uevent.uobject.mutex);
2208 
2209 	return in_len;
2210 
2211 err_remove:
2212 	idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
2213 
2214 err_destroy:
2215 	ib_destroy_qp(qp);
2216 
2217 err_put:
2218 	put_xrcd_read(xrcd_uobj);
2219 	put_uobj_write(&obj->uevent.uobject);
2220 	return ret;
2221 }
2222 
2223 ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
2224 			   struct ib_device *ib_dev,
2225 			   const char __user *buf, int in_len,
2226 			   int out_len)
2227 {
2228 	struct ib_uverbs_query_qp      cmd;
2229 	struct ib_uverbs_query_qp_resp resp;
2230 	struct ib_qp                   *qp;
2231 	struct ib_qp_attr              *attr;
2232 	struct ib_qp_init_attr         *init_attr;
2233 	int                            ret;
2234 
2235 	if (copy_from_user(&cmd, buf, sizeof cmd))
2236 		return -EFAULT;
2237 
2238 	attr      = kmalloc(sizeof *attr, GFP_KERNEL);
2239 	init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
2240 	if (!attr || !init_attr) {
2241 		ret = -ENOMEM;
2242 		goto out;
2243 	}
2244 
2245 	qp = idr_read_qp(cmd.qp_handle, file->ucontext);
2246 	if (!qp) {
2247 		ret = -EINVAL;
2248 		goto out;
2249 	}
2250 
2251 	ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
2252 
2253 	put_qp_read(qp);
2254 
2255 	if (ret)
2256 		goto out;
2257 
2258 	memset(&resp, 0, sizeof resp);
2259 
2260 	resp.qp_state               = attr->qp_state;
2261 	resp.cur_qp_state           = attr->cur_qp_state;
2262 	resp.path_mtu               = attr->path_mtu;
2263 	resp.path_mig_state         = attr->path_mig_state;
2264 	resp.qkey                   = attr->qkey;
2265 	resp.rq_psn                 = attr->rq_psn;
2266 	resp.sq_psn                 = attr->sq_psn;
2267 	resp.dest_qp_num            = attr->dest_qp_num;
2268 	resp.qp_access_flags        = attr->qp_access_flags;
2269 	resp.pkey_index             = attr->pkey_index;
2270 	resp.alt_pkey_index         = attr->alt_pkey_index;
2271 	resp.sq_draining            = attr->sq_draining;
2272 	resp.max_rd_atomic          = attr->max_rd_atomic;
2273 	resp.max_dest_rd_atomic     = attr->max_dest_rd_atomic;
2274 	resp.min_rnr_timer          = attr->min_rnr_timer;
2275 	resp.port_num               = attr->port_num;
2276 	resp.timeout                = attr->timeout;
2277 	resp.retry_cnt              = attr->retry_cnt;
2278 	resp.rnr_retry              = attr->rnr_retry;
2279 	resp.alt_port_num           = attr->alt_port_num;
2280 	resp.alt_timeout            = attr->alt_timeout;
2281 
2282 	memcpy(resp.dest.dgid, attr->ah_attr.grh.dgid.raw, 16);
2283 	resp.dest.flow_label        = attr->ah_attr.grh.flow_label;
2284 	resp.dest.sgid_index        = attr->ah_attr.grh.sgid_index;
2285 	resp.dest.hop_limit         = attr->ah_attr.grh.hop_limit;
2286 	resp.dest.traffic_class     = attr->ah_attr.grh.traffic_class;
2287 	resp.dest.dlid              = attr->ah_attr.dlid;
2288 	resp.dest.sl                = attr->ah_attr.sl;
2289 	resp.dest.src_path_bits     = attr->ah_attr.src_path_bits;
2290 	resp.dest.static_rate       = attr->ah_attr.static_rate;
2291 	resp.dest.is_global         = !!(attr->ah_attr.ah_flags & IB_AH_GRH);
2292 	resp.dest.port_num          = attr->ah_attr.port_num;
2293 
2294 	memcpy(resp.alt_dest.dgid, attr->alt_ah_attr.grh.dgid.raw, 16);
2295 	resp.alt_dest.flow_label    = attr->alt_ah_attr.grh.flow_label;
2296 	resp.alt_dest.sgid_index    = attr->alt_ah_attr.grh.sgid_index;
2297 	resp.alt_dest.hop_limit     = attr->alt_ah_attr.grh.hop_limit;
2298 	resp.alt_dest.traffic_class = attr->alt_ah_attr.grh.traffic_class;
2299 	resp.alt_dest.dlid          = attr->alt_ah_attr.dlid;
2300 	resp.alt_dest.sl            = attr->alt_ah_attr.sl;
2301 	resp.alt_dest.src_path_bits = attr->alt_ah_attr.src_path_bits;
2302 	resp.alt_dest.static_rate   = attr->alt_ah_attr.static_rate;
2303 	resp.alt_dest.is_global     = !!(attr->alt_ah_attr.ah_flags & IB_AH_GRH);
2304 	resp.alt_dest.port_num      = attr->alt_ah_attr.port_num;
2305 
2306 	resp.max_send_wr            = init_attr->cap.max_send_wr;
2307 	resp.max_recv_wr            = init_attr->cap.max_recv_wr;
2308 	resp.max_send_sge           = init_attr->cap.max_send_sge;
2309 	resp.max_recv_sge           = init_attr->cap.max_recv_sge;
2310 	resp.max_inline_data        = init_attr->cap.max_inline_data;
2311 	resp.sq_sig_all             = init_attr->sq_sig_type == IB_SIGNAL_ALL_WR;
2312 
2313 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
2314 			 &resp, sizeof resp))
2315 		ret = -EFAULT;
2316 
2317 out:
2318 	kfree(attr);
2319 	kfree(init_attr);
2320 
2321 	return ret ? ret : in_len;
2322 }
2323 
2324 /* Remove ignored fields set in the attribute mask */
2325 static int modify_qp_mask(enum ib_qp_type qp_type, int mask)
2326 {
2327 	switch (qp_type) {
2328 	case IB_QPT_XRC_INI:
2329 		return mask & ~(IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER);
2330 	case IB_QPT_XRC_TGT:
2331 		return mask & ~(IB_QP_MAX_QP_RD_ATOMIC | IB_QP_RETRY_CNT |
2332 				IB_QP_RNR_RETRY);
2333 	default:
2334 		return mask;
2335 	}
2336 }
2337 
2338 ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file,
2339 			    struct ib_device *ib_dev,
2340 			    const char __user *buf, int in_len,
2341 			    int out_len)
2342 {
2343 	struct ib_uverbs_modify_qp cmd;
2344 	struct ib_udata            udata;
2345 	struct ib_qp              *qp;
2346 	struct ib_qp_attr         *attr;
2347 	int                        ret;
2348 
2349 	if (copy_from_user(&cmd, buf, sizeof cmd))
2350 		return -EFAULT;
2351 
2352 	INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
2353 		   out_len);
2354 
2355 	attr = kmalloc(sizeof *attr, GFP_KERNEL);
2356 	if (!attr)
2357 		return -ENOMEM;
2358 
2359 	qp = idr_read_qp(cmd.qp_handle, file->ucontext);
2360 	if (!qp) {
2361 		ret = -EINVAL;
2362 		goto out;
2363 	}
2364 
2365 	attr->qp_state 		  = cmd.qp_state;
2366 	attr->cur_qp_state 	  = cmd.cur_qp_state;
2367 	attr->path_mtu 		  = cmd.path_mtu;
2368 	attr->path_mig_state 	  = cmd.path_mig_state;
2369 	attr->qkey 		  = cmd.qkey;
2370 	attr->rq_psn 		  = cmd.rq_psn;
2371 	attr->sq_psn 		  = cmd.sq_psn;
2372 	attr->dest_qp_num 	  = cmd.dest_qp_num;
2373 	attr->qp_access_flags 	  = cmd.qp_access_flags;
2374 	attr->pkey_index 	  = cmd.pkey_index;
2375 	attr->alt_pkey_index 	  = cmd.alt_pkey_index;
2376 	attr->en_sqd_async_notify = cmd.en_sqd_async_notify;
2377 	attr->max_rd_atomic 	  = cmd.max_rd_atomic;
2378 	attr->max_dest_rd_atomic  = cmd.max_dest_rd_atomic;
2379 	attr->min_rnr_timer 	  = cmd.min_rnr_timer;
2380 	attr->port_num 		  = cmd.port_num;
2381 	attr->timeout 		  = cmd.timeout;
2382 	attr->retry_cnt 	  = cmd.retry_cnt;
2383 	attr->rnr_retry 	  = cmd.rnr_retry;
2384 	attr->alt_port_num 	  = cmd.alt_port_num;
2385 	attr->alt_timeout 	  = cmd.alt_timeout;
2386 
2387 	memcpy(attr->ah_attr.grh.dgid.raw, cmd.dest.dgid, 16);
2388 	attr->ah_attr.grh.flow_label        = cmd.dest.flow_label;
2389 	attr->ah_attr.grh.sgid_index        = cmd.dest.sgid_index;
2390 	attr->ah_attr.grh.hop_limit         = cmd.dest.hop_limit;
2391 	attr->ah_attr.grh.traffic_class     = cmd.dest.traffic_class;
2392 	attr->ah_attr.dlid 	    	    = cmd.dest.dlid;
2393 	attr->ah_attr.sl   	    	    = cmd.dest.sl;
2394 	attr->ah_attr.src_path_bits 	    = cmd.dest.src_path_bits;
2395 	attr->ah_attr.static_rate   	    = cmd.dest.static_rate;
2396 	attr->ah_attr.ah_flags 	    	    = cmd.dest.is_global ? IB_AH_GRH : 0;
2397 	attr->ah_attr.port_num 	    	    = cmd.dest.port_num;
2398 
2399 	memcpy(attr->alt_ah_attr.grh.dgid.raw, cmd.alt_dest.dgid, 16);
2400 	attr->alt_ah_attr.grh.flow_label    = cmd.alt_dest.flow_label;
2401 	attr->alt_ah_attr.grh.sgid_index    = cmd.alt_dest.sgid_index;
2402 	attr->alt_ah_attr.grh.hop_limit     = cmd.alt_dest.hop_limit;
2403 	attr->alt_ah_attr.grh.traffic_class = cmd.alt_dest.traffic_class;
2404 	attr->alt_ah_attr.dlid 	    	    = cmd.alt_dest.dlid;
2405 	attr->alt_ah_attr.sl   	    	    = cmd.alt_dest.sl;
2406 	attr->alt_ah_attr.src_path_bits     = cmd.alt_dest.src_path_bits;
2407 	attr->alt_ah_attr.static_rate       = cmd.alt_dest.static_rate;
2408 	attr->alt_ah_attr.ah_flags 	    = cmd.alt_dest.is_global ? IB_AH_GRH : 0;
2409 	attr->alt_ah_attr.port_num 	    = cmd.alt_dest.port_num;
2410 
2411 	if (qp->real_qp == qp) {
2412 		if (cmd.attr_mask & IB_QP_AV) {
2413 			ret = ib_resolve_eth_dmac(qp->device, &attr->ah_attr);
2414 			if (ret)
2415 				goto release_qp;
2416 		}
2417 		ret = qp->device->modify_qp(qp, attr,
2418 			modify_qp_mask(qp->qp_type, cmd.attr_mask), &udata);
2419 	} else {
2420 		ret = ib_modify_qp(qp, attr, modify_qp_mask(qp->qp_type, cmd.attr_mask));
2421 	}
2422 
2423 	if (ret)
2424 		goto release_qp;
2425 
2426 	ret = in_len;
2427 
2428 release_qp:
2429 	put_qp_read(qp);
2430 
2431 out:
2432 	kfree(attr);
2433 
2434 	return ret;
2435 }
2436 
2437 ssize_t ib_uverbs_destroy_qp(struct ib_uverbs_file *file,
2438 			     struct ib_device *ib_dev,
2439 			     const char __user *buf, int in_len,
2440 			     int out_len)
2441 {
2442 	struct ib_uverbs_destroy_qp      cmd;
2443 	struct ib_uverbs_destroy_qp_resp resp;
2444 	struct ib_uobject		*uobj;
2445 	struct ib_qp               	*qp;
2446 	struct ib_uqp_object        	*obj;
2447 	int                        	 ret = -EINVAL;
2448 
2449 	if (copy_from_user(&cmd, buf, sizeof cmd))
2450 		return -EFAULT;
2451 
2452 	memset(&resp, 0, sizeof resp);
2453 
2454 	uobj = idr_write_uobj(&ib_uverbs_qp_idr, cmd.qp_handle, file->ucontext);
2455 	if (!uobj)
2456 		return -EINVAL;
2457 	qp  = uobj->object;
2458 	obj = container_of(uobj, struct ib_uqp_object, uevent.uobject);
2459 
2460 	if (!list_empty(&obj->mcast_list)) {
2461 		put_uobj_write(uobj);
2462 		return -EBUSY;
2463 	}
2464 
2465 	ret = ib_destroy_qp(qp);
2466 	if (!ret)
2467 		uobj->live = 0;
2468 
2469 	put_uobj_write(uobj);
2470 
2471 	if (ret)
2472 		return ret;
2473 
2474 	if (obj->uxrcd)
2475 		atomic_dec(&obj->uxrcd->refcnt);
2476 
2477 	idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
2478 
2479 	mutex_lock(&file->mutex);
2480 	list_del(&uobj->list);
2481 	mutex_unlock(&file->mutex);
2482 
2483 	ib_uverbs_release_uevent(file, &obj->uevent);
2484 
2485 	resp.events_reported = obj->uevent.events_reported;
2486 
2487 	put_uobj(uobj);
2488 
2489 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
2490 			 &resp, sizeof resp))
2491 		return -EFAULT;
2492 
2493 	return in_len;
2494 }
2495 
2496 static void *alloc_wr(size_t wr_size, __u32 num_sge)
2497 {
2498 	return kmalloc(ALIGN(wr_size, sizeof (struct ib_sge)) +
2499 			 num_sge * sizeof (struct ib_sge), GFP_KERNEL);
2500 };
2501 
2502 ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
2503 			    struct ib_device *ib_dev,
2504 			    const char __user *buf, int in_len,
2505 			    int out_len)
2506 {
2507 	struct ib_uverbs_post_send      cmd;
2508 	struct ib_uverbs_post_send_resp resp;
2509 	struct ib_uverbs_send_wr       *user_wr;
2510 	struct ib_send_wr              *wr = NULL, *last, *next, *bad_wr;
2511 	struct ib_qp                   *qp;
2512 	int                             i, sg_ind;
2513 	int				is_ud;
2514 	ssize_t                         ret = -EINVAL;
2515 	size_t                          next_size;
2516 
2517 	if (copy_from_user(&cmd, buf, sizeof cmd))
2518 		return -EFAULT;
2519 
2520 	if (in_len < sizeof cmd + cmd.wqe_size * cmd.wr_count +
2521 	    cmd.sge_count * sizeof (struct ib_uverbs_sge))
2522 		return -EINVAL;
2523 
2524 	if (cmd.wqe_size < sizeof (struct ib_uverbs_send_wr))
2525 		return -EINVAL;
2526 
2527 	user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL);
2528 	if (!user_wr)
2529 		return -ENOMEM;
2530 
2531 	qp = idr_read_qp(cmd.qp_handle, file->ucontext);
2532 	if (!qp)
2533 		goto out;
2534 
2535 	is_ud = qp->qp_type == IB_QPT_UD;
2536 	sg_ind = 0;
2537 	last = NULL;
2538 	for (i = 0; i < cmd.wr_count; ++i) {
2539 		if (copy_from_user(user_wr,
2540 				   buf + sizeof cmd + i * cmd.wqe_size,
2541 				   cmd.wqe_size)) {
2542 			ret = -EFAULT;
2543 			goto out_put;
2544 		}
2545 
2546 		if (user_wr->num_sge + sg_ind > cmd.sge_count) {
2547 			ret = -EINVAL;
2548 			goto out_put;
2549 		}
2550 
2551 		if (is_ud) {
2552 			struct ib_ud_wr *ud;
2553 
2554 			if (user_wr->opcode != IB_WR_SEND &&
2555 			    user_wr->opcode != IB_WR_SEND_WITH_IMM) {
2556 				ret = -EINVAL;
2557 				goto out_put;
2558 			}
2559 
2560 			next_size = sizeof(*ud);
2561 			ud = alloc_wr(next_size, user_wr->num_sge);
2562 			if (!ud) {
2563 				ret = -ENOMEM;
2564 				goto out_put;
2565 			}
2566 
2567 			ud->ah = idr_read_ah(user_wr->wr.ud.ah, file->ucontext);
2568 			if (!ud->ah) {
2569 				kfree(ud);
2570 				ret = -EINVAL;
2571 				goto out_put;
2572 			}
2573 			ud->remote_qpn = user_wr->wr.ud.remote_qpn;
2574 			ud->remote_qkey = user_wr->wr.ud.remote_qkey;
2575 
2576 			next = &ud->wr;
2577 		} else if (user_wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM ||
2578 			   user_wr->opcode == IB_WR_RDMA_WRITE ||
2579 			   user_wr->opcode == IB_WR_RDMA_READ) {
2580 			struct ib_rdma_wr *rdma;
2581 
2582 			next_size = sizeof(*rdma);
2583 			rdma = alloc_wr(next_size, user_wr->num_sge);
2584 			if (!rdma) {
2585 				ret = -ENOMEM;
2586 				goto out_put;
2587 			}
2588 
2589 			rdma->remote_addr = user_wr->wr.rdma.remote_addr;
2590 			rdma->rkey = user_wr->wr.rdma.rkey;
2591 
2592 			next = &rdma->wr;
2593 		} else if (user_wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
2594 			   user_wr->opcode == IB_WR_ATOMIC_FETCH_AND_ADD) {
2595 			struct ib_atomic_wr *atomic;
2596 
2597 			next_size = sizeof(*atomic);
2598 			atomic = alloc_wr(next_size, user_wr->num_sge);
2599 			if (!atomic) {
2600 				ret = -ENOMEM;
2601 				goto out_put;
2602 			}
2603 
2604 			atomic->remote_addr = user_wr->wr.atomic.remote_addr;
2605 			atomic->compare_add = user_wr->wr.atomic.compare_add;
2606 			atomic->swap = user_wr->wr.atomic.swap;
2607 			atomic->rkey = user_wr->wr.atomic.rkey;
2608 
2609 			next = &atomic->wr;
2610 		} else if (user_wr->opcode == IB_WR_SEND ||
2611 			   user_wr->opcode == IB_WR_SEND_WITH_IMM ||
2612 			   user_wr->opcode == IB_WR_SEND_WITH_INV) {
2613 			next_size = sizeof(*next);
2614 			next = alloc_wr(next_size, user_wr->num_sge);
2615 			if (!next) {
2616 				ret = -ENOMEM;
2617 				goto out_put;
2618 			}
2619 		} else {
2620 			ret = -EINVAL;
2621 			goto out_put;
2622 		}
2623 
2624 		if (user_wr->opcode == IB_WR_SEND_WITH_IMM ||
2625 		    user_wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM) {
2626 			next->ex.imm_data =
2627 					(__be32 __force) user_wr->ex.imm_data;
2628 		} else if (user_wr->opcode == IB_WR_SEND_WITH_INV) {
2629 			next->ex.invalidate_rkey = user_wr->ex.invalidate_rkey;
2630 		}
2631 
2632 		if (!last)
2633 			wr = next;
2634 		else
2635 			last->next = next;
2636 		last = next;
2637 
2638 		next->next       = NULL;
2639 		next->wr_id      = user_wr->wr_id;
2640 		next->num_sge    = user_wr->num_sge;
2641 		next->opcode     = user_wr->opcode;
2642 		next->send_flags = user_wr->send_flags;
2643 
2644 		if (next->num_sge) {
2645 			next->sg_list = (void *)((char *)next +
2646 				ALIGN(next_size, sizeof(struct ib_sge)));
2647 			if (copy_from_user(next->sg_list,
2648 					   (const char *)buf + sizeof cmd +
2649 					   cmd.wr_count * cmd.wqe_size +
2650 					   sg_ind * sizeof (struct ib_sge),
2651 					   next->num_sge * sizeof (struct ib_sge))) {
2652 				ret = -EFAULT;
2653 				goto out_put;
2654 			}
2655 			sg_ind += next->num_sge;
2656 		} else
2657 			next->sg_list = NULL;
2658 	}
2659 
2660 	resp.bad_wr = 0;
2661 	ret = qp->device->post_send(qp->real_qp, wr, &bad_wr);
2662 	if (ret)
2663 		for (next = wr; next; next = next->next) {
2664 			++resp.bad_wr;
2665 			if (next == bad_wr)
2666 				break;
2667 		}
2668 
2669 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
2670 			 &resp, sizeof resp))
2671 		ret = -EFAULT;
2672 
2673 out_put:
2674 	put_qp_read(qp);
2675 
2676 	while (wr) {
2677 		if (is_ud && ud_wr(wr)->ah)
2678 			put_ah_read(ud_wr(wr)->ah);
2679 		next = wr->next;
2680 		kfree(wr);
2681 		wr = next;
2682 	}
2683 
2684 out:
2685 	kfree(user_wr);
2686 
2687 	return ret ? ret : in_len;
2688 }
2689 
2690 static struct ib_recv_wr *ib_uverbs_unmarshall_recv(const char __user *buf,
2691 						    int in_len,
2692 						    u32 wr_count,
2693 						    u32 sge_count,
2694 						    u32 wqe_size)
2695 {
2696 	struct ib_uverbs_recv_wr *user_wr;
2697 	struct ib_recv_wr        *wr = NULL, *last, *next;
2698 	int                       sg_ind;
2699 	int                       i;
2700 	int                       ret;
2701 
2702 	if (in_len < wqe_size * wr_count +
2703 	    sge_count * sizeof (struct ib_uverbs_sge))
2704 		return ERR_PTR(-EINVAL);
2705 
2706 	if (wqe_size < sizeof (struct ib_uverbs_recv_wr))
2707 		return ERR_PTR(-EINVAL);
2708 
2709 	user_wr = kmalloc(wqe_size, GFP_KERNEL);
2710 	if (!user_wr)
2711 		return ERR_PTR(-ENOMEM);
2712 
2713 	sg_ind = 0;
2714 	last = NULL;
2715 	for (i = 0; i < wr_count; ++i) {
2716 		if (copy_from_user(user_wr, buf + i * wqe_size,
2717 				   wqe_size)) {
2718 			ret = -EFAULT;
2719 			goto err;
2720 		}
2721 
2722 		if (user_wr->num_sge + sg_ind > sge_count) {
2723 			ret = -EINVAL;
2724 			goto err;
2725 		}
2726 
2727 		next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
2728 			       user_wr->num_sge * sizeof (struct ib_sge),
2729 			       GFP_KERNEL);
2730 		if (!next) {
2731 			ret = -ENOMEM;
2732 			goto err;
2733 		}
2734 
2735 		if (!last)
2736 			wr = next;
2737 		else
2738 			last->next = next;
2739 		last = next;
2740 
2741 		next->next       = NULL;
2742 		next->wr_id      = user_wr->wr_id;
2743 		next->num_sge    = user_wr->num_sge;
2744 
2745 		if (next->num_sge) {
2746 			next->sg_list = (void *)((char *)next +
2747 				ALIGN(sizeof *next, sizeof (struct ib_sge)));
2748 			if (copy_from_user(next->sg_list,
2749 					   (const char *)buf + wr_count * wqe_size +
2750 					   sg_ind * sizeof (struct ib_sge),
2751 					   next->num_sge * sizeof (struct ib_sge))) {
2752 				ret = -EFAULT;
2753 				goto err;
2754 			}
2755 			sg_ind += next->num_sge;
2756 		} else
2757 			next->sg_list = NULL;
2758 	}
2759 
2760 	kfree(user_wr);
2761 	return wr;
2762 
2763 err:
2764 	kfree(user_wr);
2765 
2766 	while (wr) {
2767 		next = wr->next;
2768 		kfree(wr);
2769 		wr = next;
2770 	}
2771 
2772 	return ERR_PTR(ret);
2773 }
2774 
2775 ssize_t ib_uverbs_post_recv(struct ib_uverbs_file *file,
2776 			    struct ib_device *ib_dev,
2777 			    const char __user *buf, int in_len,
2778 			    int out_len)
2779 {
2780 	struct ib_uverbs_post_recv      cmd;
2781 	struct ib_uverbs_post_recv_resp resp;
2782 	struct ib_recv_wr              *wr, *next, *bad_wr;
2783 	struct ib_qp                   *qp;
2784 	ssize_t                         ret = -EINVAL;
2785 
2786 	if (copy_from_user(&cmd, buf, sizeof cmd))
2787 		return -EFAULT;
2788 
2789 	wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
2790 				       in_len - sizeof cmd, cmd.wr_count,
2791 				       cmd.sge_count, cmd.wqe_size);
2792 	if (IS_ERR(wr))
2793 		return PTR_ERR(wr);
2794 
2795 	qp = idr_read_qp(cmd.qp_handle, file->ucontext);
2796 	if (!qp)
2797 		goto out;
2798 
2799 	resp.bad_wr = 0;
2800 	ret = qp->device->post_recv(qp->real_qp, wr, &bad_wr);
2801 
2802 	put_qp_read(qp);
2803 
2804 	if (ret)
2805 		for (next = wr; next; next = next->next) {
2806 			++resp.bad_wr;
2807 			if (next == bad_wr)
2808 				break;
2809 		}
2810 
2811 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
2812 			 &resp, sizeof resp))
2813 		ret = -EFAULT;
2814 
2815 out:
2816 	while (wr) {
2817 		next = wr->next;
2818 		kfree(wr);
2819 		wr = next;
2820 	}
2821 
2822 	return ret ? ret : in_len;
2823 }
2824 
2825 ssize_t ib_uverbs_post_srq_recv(struct ib_uverbs_file *file,
2826 				struct ib_device *ib_dev,
2827 				const char __user *buf, int in_len,
2828 				int out_len)
2829 {
2830 	struct ib_uverbs_post_srq_recv      cmd;
2831 	struct ib_uverbs_post_srq_recv_resp resp;
2832 	struct ib_recv_wr                  *wr, *next, *bad_wr;
2833 	struct ib_srq                      *srq;
2834 	ssize_t                             ret = -EINVAL;
2835 
2836 	if (copy_from_user(&cmd, buf, sizeof cmd))
2837 		return -EFAULT;
2838 
2839 	wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
2840 				       in_len - sizeof cmd, cmd.wr_count,
2841 				       cmd.sge_count, cmd.wqe_size);
2842 	if (IS_ERR(wr))
2843 		return PTR_ERR(wr);
2844 
2845 	srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2846 	if (!srq)
2847 		goto out;
2848 
2849 	resp.bad_wr = 0;
2850 	ret = srq->device->post_srq_recv(srq, wr, &bad_wr);
2851 
2852 	put_srq_read(srq);
2853 
2854 	if (ret)
2855 		for (next = wr; next; next = next->next) {
2856 			++resp.bad_wr;
2857 			if (next == bad_wr)
2858 				break;
2859 		}
2860 
2861 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
2862 			 &resp, sizeof resp))
2863 		ret = -EFAULT;
2864 
2865 out:
2866 	while (wr) {
2867 		next = wr->next;
2868 		kfree(wr);
2869 		wr = next;
2870 	}
2871 
2872 	return ret ? ret : in_len;
2873 }
2874 
2875 ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
2876 			    struct ib_device *ib_dev,
2877 			    const char __user *buf, int in_len,
2878 			    int out_len)
2879 {
2880 	struct ib_uverbs_create_ah	 cmd;
2881 	struct ib_uverbs_create_ah_resp	 resp;
2882 	struct ib_uobject		*uobj;
2883 	struct ib_pd			*pd;
2884 	struct ib_ah			*ah;
2885 	struct ib_ah_attr		attr;
2886 	int ret;
2887 	struct ib_udata                   udata;
2888 
2889 	if (out_len < sizeof resp)
2890 		return -ENOSPC;
2891 
2892 	if (copy_from_user(&cmd, buf, sizeof cmd))
2893 		return -EFAULT;
2894 
2895 	INIT_UDATA(&udata, buf + sizeof(cmd),
2896 		   (unsigned long)cmd.response + sizeof(resp),
2897 		   in_len - sizeof(cmd), out_len - sizeof(resp));
2898 
2899 	uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
2900 	if (!uobj)
2901 		return -ENOMEM;
2902 
2903 	init_uobj(uobj, cmd.user_handle, file->ucontext, &ah_lock_class);
2904 	down_write(&uobj->mutex);
2905 
2906 	pd = idr_read_pd(cmd.pd_handle, file->ucontext);
2907 	if (!pd) {
2908 		ret = -EINVAL;
2909 		goto err;
2910 	}
2911 
2912 	attr.dlid 	       = cmd.attr.dlid;
2913 	attr.sl 	       = cmd.attr.sl;
2914 	attr.src_path_bits     = cmd.attr.src_path_bits;
2915 	attr.static_rate       = cmd.attr.static_rate;
2916 	attr.ah_flags          = cmd.attr.is_global ? IB_AH_GRH : 0;
2917 	attr.port_num 	       = cmd.attr.port_num;
2918 	attr.grh.flow_label    = cmd.attr.grh.flow_label;
2919 	attr.grh.sgid_index    = cmd.attr.grh.sgid_index;
2920 	attr.grh.hop_limit     = cmd.attr.grh.hop_limit;
2921 	attr.grh.traffic_class = cmd.attr.grh.traffic_class;
2922 	memset(&attr.dmac, 0, sizeof(attr.dmac));
2923 	memcpy(attr.grh.dgid.raw, cmd.attr.grh.dgid, 16);
2924 
2925 	ah = pd->device->create_ah(pd, &attr, &udata);
2926 
2927 	if (IS_ERR(ah)) {
2928 		ret = PTR_ERR(ah);
2929 		goto err_put;
2930 	}
2931 
2932 	ah->device  = pd->device;
2933 	ah->pd      = pd;
2934 	atomic_inc(&pd->usecnt);
2935 	ah->uobject  = uobj;
2936 	uobj->object = ah;
2937 
2938 	ret = idr_add_uobj(&ib_uverbs_ah_idr, uobj);
2939 	if (ret)
2940 		goto err_destroy;
2941 
2942 	resp.ah_handle = uobj->id;
2943 
2944 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
2945 			 &resp, sizeof resp)) {
2946 		ret = -EFAULT;
2947 		goto err_copy;
2948 	}
2949 
2950 	put_pd_read(pd);
2951 
2952 	mutex_lock(&file->mutex);
2953 	list_add_tail(&uobj->list, &file->ucontext->ah_list);
2954 	mutex_unlock(&file->mutex);
2955 
2956 	uobj->live = 1;
2957 
2958 	up_write(&uobj->mutex);
2959 
2960 	return in_len;
2961 
2962 err_copy:
2963 	idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
2964 
2965 err_destroy:
2966 	ib_destroy_ah(ah);
2967 
2968 err_put:
2969 	put_pd_read(pd);
2970 
2971 err:
2972 	put_uobj_write(uobj);
2973 	return ret;
2974 }
2975 
2976 ssize_t ib_uverbs_destroy_ah(struct ib_uverbs_file *file,
2977 			     struct ib_device *ib_dev,
2978 			     const char __user *buf, int in_len, int out_len)
2979 {
2980 	struct ib_uverbs_destroy_ah cmd;
2981 	struct ib_ah		   *ah;
2982 	struct ib_uobject	   *uobj;
2983 	int			    ret;
2984 
2985 	if (copy_from_user(&cmd, buf, sizeof cmd))
2986 		return -EFAULT;
2987 
2988 	uobj = idr_write_uobj(&ib_uverbs_ah_idr, cmd.ah_handle, file->ucontext);
2989 	if (!uobj)
2990 		return -EINVAL;
2991 	ah = uobj->object;
2992 
2993 	ret = ib_destroy_ah(ah);
2994 	if (!ret)
2995 		uobj->live = 0;
2996 
2997 	put_uobj_write(uobj);
2998 
2999 	if (ret)
3000 		return ret;
3001 
3002 	idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
3003 
3004 	mutex_lock(&file->mutex);
3005 	list_del(&uobj->list);
3006 	mutex_unlock(&file->mutex);
3007 
3008 	put_uobj(uobj);
3009 
3010 	return in_len;
3011 }
3012 
3013 ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
3014 			       struct ib_device *ib_dev,
3015 			       const char __user *buf, int in_len,
3016 			       int out_len)
3017 {
3018 	struct ib_uverbs_attach_mcast cmd;
3019 	struct ib_qp                 *qp;
3020 	struct ib_uqp_object         *obj;
3021 	struct ib_uverbs_mcast_entry *mcast;
3022 	int                           ret;
3023 
3024 	if (copy_from_user(&cmd, buf, sizeof cmd))
3025 		return -EFAULT;
3026 
3027 	qp = idr_write_qp(cmd.qp_handle, file->ucontext);
3028 	if (!qp)
3029 		return -EINVAL;
3030 
3031 	obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
3032 
3033 	list_for_each_entry(mcast, &obj->mcast_list, list)
3034 		if (cmd.mlid == mcast->lid &&
3035 		    !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
3036 			ret = 0;
3037 			goto out_put;
3038 		}
3039 
3040 	mcast = kmalloc(sizeof *mcast, GFP_KERNEL);
3041 	if (!mcast) {
3042 		ret = -ENOMEM;
3043 		goto out_put;
3044 	}
3045 
3046 	mcast->lid = cmd.mlid;
3047 	memcpy(mcast->gid.raw, cmd.gid, sizeof mcast->gid.raw);
3048 
3049 	ret = ib_attach_mcast(qp, &mcast->gid, cmd.mlid);
3050 	if (!ret)
3051 		list_add_tail(&mcast->list, &obj->mcast_list);
3052 	else
3053 		kfree(mcast);
3054 
3055 out_put:
3056 	put_qp_write(qp);
3057 
3058 	return ret ? ret : in_len;
3059 }
3060 
3061 ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
3062 			       struct ib_device *ib_dev,
3063 			       const char __user *buf, int in_len,
3064 			       int out_len)
3065 {
3066 	struct ib_uverbs_detach_mcast cmd;
3067 	struct ib_uqp_object         *obj;
3068 	struct ib_qp                 *qp;
3069 	struct ib_uverbs_mcast_entry *mcast;
3070 	int                           ret = -EINVAL;
3071 
3072 	if (copy_from_user(&cmd, buf, sizeof cmd))
3073 		return -EFAULT;
3074 
3075 	qp = idr_write_qp(cmd.qp_handle, file->ucontext);
3076 	if (!qp)
3077 		return -EINVAL;
3078 
3079 	ret = ib_detach_mcast(qp, (union ib_gid *) cmd.gid, cmd.mlid);
3080 	if (ret)
3081 		goto out_put;
3082 
3083 	obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
3084 
3085 	list_for_each_entry(mcast, &obj->mcast_list, list)
3086 		if (cmd.mlid == mcast->lid &&
3087 		    !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
3088 			list_del(&mcast->list);
3089 			kfree(mcast);
3090 			break;
3091 		}
3092 
3093 out_put:
3094 	put_qp_write(qp);
3095 
3096 	return ret ? ret : in_len;
3097 }
3098 
3099 static size_t kern_spec_filter_sz(struct ib_uverbs_flow_spec_hdr *spec)
3100 {
3101 	/* Returns user space filter size, includes padding */
3102 	return (spec->size - sizeof(struct ib_uverbs_flow_spec_hdr)) / 2;
3103 }
3104 
3105 static ssize_t spec_filter_size(void *kern_spec_filter, u16 kern_filter_size,
3106 				u16 ib_real_filter_sz)
3107 {
3108 	/*
3109 	 * User space filter structures must be 64 bit aligned, otherwise this
3110 	 * may pass, but we won't handle additional new attributes.
3111 	 */
3112 
3113 	if (kern_filter_size > ib_real_filter_sz) {
3114 		if (memchr_inv((char *)kern_spec_filter +
3115 			       ib_real_filter_sz, 0,
3116 			       kern_filter_size - ib_real_filter_sz))
3117 			return -EINVAL;
3118 		return ib_real_filter_sz;
3119 	}
3120 	return kern_filter_size;
3121 }
3122 
3123 static int kern_spec_to_ib_spec(struct ib_uverbs_flow_spec *kern_spec,
3124 				union ib_flow_spec *ib_spec)
3125 {
3126 	ssize_t actual_filter_sz;
3127 	ssize_t kern_filter_sz;
3128 	ssize_t ib_filter_sz;
3129 	void *kern_spec_mask;
3130 	void *kern_spec_val;
3131 
3132 	if (kern_spec->reserved)
3133 		return -EINVAL;
3134 
3135 	ib_spec->type = kern_spec->type;
3136 
3137 	kern_filter_sz = kern_spec_filter_sz(&kern_spec->hdr);
3138 	/* User flow spec size must be aligned to 4 bytes */
3139 	if (kern_filter_sz != ALIGN(kern_filter_sz, 4))
3140 		return -EINVAL;
3141 
3142 	kern_spec_val = (char *)kern_spec +
3143 		sizeof(struct ib_uverbs_flow_spec_hdr);
3144 	kern_spec_mask = (char *)kern_spec_val + kern_filter_sz;
3145 
3146 	switch (ib_spec->type) {
3147 	case IB_FLOW_SPEC_ETH:
3148 		ib_filter_sz = offsetof(struct ib_flow_eth_filter, real_sz);
3149 		actual_filter_sz = spec_filter_size(kern_spec_mask,
3150 						    kern_filter_sz,
3151 						    ib_filter_sz);
3152 		if (actual_filter_sz <= 0)
3153 			return -EINVAL;
3154 		ib_spec->size = sizeof(struct ib_flow_spec_eth);
3155 		memcpy(&ib_spec->eth.val, kern_spec_val, actual_filter_sz);
3156 		memcpy(&ib_spec->eth.mask, kern_spec_mask, actual_filter_sz);
3157 		break;
3158 	case IB_FLOW_SPEC_IPV4:
3159 		ib_filter_sz = offsetof(struct ib_flow_ipv4_filter, real_sz);
3160 		actual_filter_sz = spec_filter_size(kern_spec_mask,
3161 						    kern_filter_sz,
3162 						    ib_filter_sz);
3163 		if (actual_filter_sz <= 0)
3164 			return -EINVAL;
3165 		ib_spec->size = sizeof(struct ib_flow_spec_ipv4);
3166 		memcpy(&ib_spec->ipv4.val, kern_spec_val, actual_filter_sz);
3167 		memcpy(&ib_spec->ipv4.mask, kern_spec_mask, actual_filter_sz);
3168 		break;
3169 	case IB_FLOW_SPEC_IPV6:
3170 		ib_filter_sz = offsetof(struct ib_flow_ipv6_filter, real_sz);
3171 		actual_filter_sz = spec_filter_size(kern_spec_mask,
3172 						    kern_filter_sz,
3173 						    ib_filter_sz);
3174 		if (actual_filter_sz <= 0)
3175 			return -EINVAL;
3176 		ib_spec->size = sizeof(struct ib_flow_spec_ipv6);
3177 		memcpy(&ib_spec->ipv6.val, kern_spec_val, actual_filter_sz);
3178 		memcpy(&ib_spec->ipv6.mask, kern_spec_mask, actual_filter_sz);
3179 
3180 		if ((ntohl(ib_spec->ipv6.mask.flow_label)) >= BIT(20) ||
3181 		    (ntohl(ib_spec->ipv6.val.flow_label)) >= BIT(20))
3182 			return -EINVAL;
3183 		break;
3184 	case IB_FLOW_SPEC_TCP:
3185 	case IB_FLOW_SPEC_UDP:
3186 		ib_filter_sz = offsetof(struct ib_flow_tcp_udp_filter, real_sz);
3187 		actual_filter_sz = spec_filter_size(kern_spec_mask,
3188 						    kern_filter_sz,
3189 						    ib_filter_sz);
3190 		if (actual_filter_sz <= 0)
3191 			return -EINVAL;
3192 		ib_spec->size = sizeof(struct ib_flow_spec_tcp_udp);
3193 		memcpy(&ib_spec->tcp_udp.val, kern_spec_val, actual_filter_sz);
3194 		memcpy(&ib_spec->tcp_udp.mask, kern_spec_mask, actual_filter_sz);
3195 		break;
3196 	default:
3197 		return -EINVAL;
3198 	}
3199 	return 0;
3200 }
3201 
3202 int ib_uverbs_ex_create_wq(struct ib_uverbs_file *file,
3203 			   struct ib_device *ib_dev,
3204 			   struct ib_udata *ucore,
3205 			   struct ib_udata *uhw)
3206 {
3207 	struct ib_uverbs_ex_create_wq	  cmd = {};
3208 	struct ib_uverbs_ex_create_wq_resp resp = {};
3209 	struct ib_uwq_object           *obj;
3210 	int err = 0;
3211 	struct ib_cq *cq;
3212 	struct ib_pd *pd;
3213 	struct ib_wq *wq;
3214 	struct ib_wq_init_attr wq_init_attr = {};
3215 	size_t required_cmd_sz;
3216 	size_t required_resp_len;
3217 
3218 	required_cmd_sz = offsetof(typeof(cmd), max_sge) + sizeof(cmd.max_sge);
3219 	required_resp_len = offsetof(typeof(resp), wqn) + sizeof(resp.wqn);
3220 
3221 	if (ucore->inlen < required_cmd_sz)
3222 		return -EINVAL;
3223 
3224 	if (ucore->outlen < required_resp_len)
3225 		return -ENOSPC;
3226 
3227 	if (ucore->inlen > sizeof(cmd) &&
3228 	    !ib_is_udata_cleared(ucore, sizeof(cmd),
3229 				 ucore->inlen - sizeof(cmd)))
3230 		return -EOPNOTSUPP;
3231 
3232 	err = ib_copy_from_udata(&cmd, ucore, min(sizeof(cmd), ucore->inlen));
3233 	if (err)
3234 		return err;
3235 
3236 	if (cmd.comp_mask)
3237 		return -EOPNOTSUPP;
3238 
3239 	obj = kmalloc(sizeof(*obj), GFP_KERNEL);
3240 	if (!obj)
3241 		return -ENOMEM;
3242 
3243 	init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext,
3244 		  &wq_lock_class);
3245 	down_write(&obj->uevent.uobject.mutex);
3246 	pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
3247 	if (!pd) {
3248 		err = -EINVAL;
3249 		goto err_uobj;
3250 	}
3251 
3252 	cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
3253 	if (!cq) {
3254 		err = -EINVAL;
3255 		goto err_put_pd;
3256 	}
3257 
3258 	wq_init_attr.cq = cq;
3259 	wq_init_attr.max_sge = cmd.max_sge;
3260 	wq_init_attr.max_wr = cmd.max_wr;
3261 	wq_init_attr.wq_context = file;
3262 	wq_init_attr.wq_type = cmd.wq_type;
3263 	wq_init_attr.event_handler = ib_uverbs_wq_event_handler;
3264 	obj->uevent.events_reported = 0;
3265 	INIT_LIST_HEAD(&obj->uevent.event_list);
3266 	wq = pd->device->create_wq(pd, &wq_init_attr, uhw);
3267 	if (IS_ERR(wq)) {
3268 		err = PTR_ERR(wq);
3269 		goto err_put_cq;
3270 	}
3271 
3272 	wq->uobject = &obj->uevent.uobject;
3273 	obj->uevent.uobject.object = wq;
3274 	wq->wq_type = wq_init_attr.wq_type;
3275 	wq->cq = cq;
3276 	wq->pd = pd;
3277 	wq->device = pd->device;
3278 	wq->wq_context = wq_init_attr.wq_context;
3279 	atomic_set(&wq->usecnt, 0);
3280 	atomic_inc(&pd->usecnt);
3281 	atomic_inc(&cq->usecnt);
3282 	wq->uobject = &obj->uevent.uobject;
3283 	obj->uevent.uobject.object = wq;
3284 	err = idr_add_uobj(&ib_uverbs_wq_idr, &obj->uevent.uobject);
3285 	if (err)
3286 		goto destroy_wq;
3287 
3288 	memset(&resp, 0, sizeof(resp));
3289 	resp.wq_handle = obj->uevent.uobject.id;
3290 	resp.max_sge = wq_init_attr.max_sge;
3291 	resp.max_wr = wq_init_attr.max_wr;
3292 	resp.wqn = wq->wq_num;
3293 	resp.response_length = required_resp_len;
3294 	err = ib_copy_to_udata(ucore,
3295 			       &resp, resp.response_length);
3296 	if (err)
3297 		goto err_copy;
3298 
3299 	put_pd_read(pd);
3300 	put_cq_read(cq);
3301 
3302 	mutex_lock(&file->mutex);
3303 	list_add_tail(&obj->uevent.uobject.list, &file->ucontext->wq_list);
3304 	mutex_unlock(&file->mutex);
3305 
3306 	obj->uevent.uobject.live = 1;
3307 	up_write(&obj->uevent.uobject.mutex);
3308 	return 0;
3309 
3310 err_copy:
3311 	idr_remove_uobj(&ib_uverbs_wq_idr, &obj->uevent.uobject);
3312 destroy_wq:
3313 	ib_destroy_wq(wq);
3314 err_put_cq:
3315 	put_cq_read(cq);
3316 err_put_pd:
3317 	put_pd_read(pd);
3318 err_uobj:
3319 	put_uobj_write(&obj->uevent.uobject);
3320 
3321 	return err;
3322 }
3323 
3324 int ib_uverbs_ex_destroy_wq(struct ib_uverbs_file *file,
3325 			    struct ib_device *ib_dev,
3326 			    struct ib_udata *ucore,
3327 			    struct ib_udata *uhw)
3328 {
3329 	struct ib_uverbs_ex_destroy_wq	cmd = {};
3330 	struct ib_uverbs_ex_destroy_wq_resp	resp = {};
3331 	struct ib_wq			*wq;
3332 	struct ib_uobject		*uobj;
3333 	struct ib_uwq_object		*obj;
3334 	size_t required_cmd_sz;
3335 	size_t required_resp_len;
3336 	int				ret;
3337 
3338 	required_cmd_sz = offsetof(typeof(cmd), wq_handle) + sizeof(cmd.wq_handle);
3339 	required_resp_len = offsetof(typeof(resp), reserved) + sizeof(resp.reserved);
3340 
3341 	if (ucore->inlen < required_cmd_sz)
3342 		return -EINVAL;
3343 
3344 	if (ucore->outlen < required_resp_len)
3345 		return -ENOSPC;
3346 
3347 	if (ucore->inlen > sizeof(cmd) &&
3348 	    !ib_is_udata_cleared(ucore, sizeof(cmd),
3349 				 ucore->inlen - sizeof(cmd)))
3350 		return -EOPNOTSUPP;
3351 
3352 	ret = ib_copy_from_udata(&cmd, ucore, min(sizeof(cmd), ucore->inlen));
3353 	if (ret)
3354 		return ret;
3355 
3356 	if (cmd.comp_mask)
3357 		return -EOPNOTSUPP;
3358 
3359 	resp.response_length = required_resp_len;
3360 	uobj = idr_write_uobj(&ib_uverbs_wq_idr, cmd.wq_handle,
3361 			      file->ucontext);
3362 	if (!uobj)
3363 		return -EINVAL;
3364 
3365 	wq = uobj->object;
3366 	obj = container_of(uobj, struct ib_uwq_object, uevent.uobject);
3367 	ret = ib_destroy_wq(wq);
3368 	if (!ret)
3369 		uobj->live = 0;
3370 
3371 	put_uobj_write(uobj);
3372 	if (ret)
3373 		return ret;
3374 
3375 	idr_remove_uobj(&ib_uverbs_wq_idr, uobj);
3376 
3377 	mutex_lock(&file->mutex);
3378 	list_del(&uobj->list);
3379 	mutex_unlock(&file->mutex);
3380 
3381 	ib_uverbs_release_uevent(file, &obj->uevent);
3382 	resp.events_reported = obj->uevent.events_reported;
3383 	put_uobj(uobj);
3384 
3385 	ret = ib_copy_to_udata(ucore, &resp, resp.response_length);
3386 	if (ret)
3387 		return ret;
3388 
3389 	return 0;
3390 }
3391 
3392 int ib_uverbs_ex_modify_wq(struct ib_uverbs_file *file,
3393 			   struct ib_device *ib_dev,
3394 			   struct ib_udata *ucore,
3395 			   struct ib_udata *uhw)
3396 {
3397 	struct ib_uverbs_ex_modify_wq cmd = {};
3398 	struct ib_wq *wq;
3399 	struct ib_wq_attr wq_attr = {};
3400 	size_t required_cmd_sz;
3401 	int ret;
3402 
3403 	required_cmd_sz = offsetof(typeof(cmd), curr_wq_state) + sizeof(cmd.curr_wq_state);
3404 	if (ucore->inlen < required_cmd_sz)
3405 		return -EINVAL;
3406 
3407 	if (ucore->inlen > sizeof(cmd) &&
3408 	    !ib_is_udata_cleared(ucore, sizeof(cmd),
3409 				 ucore->inlen - sizeof(cmd)))
3410 		return -EOPNOTSUPP;
3411 
3412 	ret = ib_copy_from_udata(&cmd, ucore, min(sizeof(cmd), ucore->inlen));
3413 	if (ret)
3414 		return ret;
3415 
3416 	if (!cmd.attr_mask)
3417 		return -EINVAL;
3418 
3419 	if (cmd.attr_mask > (IB_WQ_STATE | IB_WQ_CUR_STATE))
3420 		return -EINVAL;
3421 
3422 	wq = idr_read_wq(cmd.wq_handle, file->ucontext);
3423 	if (!wq)
3424 		return -EINVAL;
3425 
3426 	wq_attr.curr_wq_state = cmd.curr_wq_state;
3427 	wq_attr.wq_state = cmd.wq_state;
3428 	ret = wq->device->modify_wq(wq, &wq_attr, cmd.attr_mask, uhw);
3429 	put_wq_read(wq);
3430 	return ret;
3431 }
3432 
3433 int ib_uverbs_ex_create_rwq_ind_table(struct ib_uverbs_file *file,
3434 				      struct ib_device *ib_dev,
3435 				      struct ib_udata *ucore,
3436 				      struct ib_udata *uhw)
3437 {
3438 	struct ib_uverbs_ex_create_rwq_ind_table	  cmd = {};
3439 	struct ib_uverbs_ex_create_rwq_ind_table_resp  resp = {};
3440 	struct ib_uobject		  *uobj;
3441 	int err = 0;
3442 	struct ib_rwq_ind_table_init_attr init_attr = {};
3443 	struct ib_rwq_ind_table *rwq_ind_tbl;
3444 	struct ib_wq	**wqs = NULL;
3445 	u32 *wqs_handles = NULL;
3446 	struct ib_wq	*wq = NULL;
3447 	int i, j, num_read_wqs;
3448 	u32 num_wq_handles;
3449 	u32 expected_in_size;
3450 	size_t required_cmd_sz_header;
3451 	size_t required_resp_len;
3452 
3453 	required_cmd_sz_header = offsetof(typeof(cmd), log_ind_tbl_size) + sizeof(cmd.log_ind_tbl_size);
3454 	required_resp_len = offsetof(typeof(resp), ind_tbl_num) + sizeof(resp.ind_tbl_num);
3455 
3456 	if (ucore->inlen < required_cmd_sz_header)
3457 		return -EINVAL;
3458 
3459 	if (ucore->outlen < required_resp_len)
3460 		return -ENOSPC;
3461 
3462 	err = ib_copy_from_udata(&cmd, ucore, required_cmd_sz_header);
3463 	if (err)
3464 		return err;
3465 
3466 	ucore->inbuf = (const char *)ucore->inbuf + required_cmd_sz_header;
3467 	ucore->inlen -= required_cmd_sz_header;
3468 
3469 	if (cmd.comp_mask)
3470 		return -EOPNOTSUPP;
3471 
3472 	if (cmd.log_ind_tbl_size > IB_USER_VERBS_MAX_LOG_IND_TBL_SIZE)
3473 		return -EINVAL;
3474 
3475 	num_wq_handles = 1 << cmd.log_ind_tbl_size;
3476 	expected_in_size = num_wq_handles * sizeof(__u32);
3477 	if (num_wq_handles == 1)
3478 		/* input size for wq handles is u64 aligned */
3479 		expected_in_size += sizeof(__u32);
3480 
3481 	if (ucore->inlen < expected_in_size)
3482 		return -EINVAL;
3483 
3484 	if (ucore->inlen > expected_in_size &&
3485 	    !ib_is_udata_cleared(ucore, expected_in_size,
3486 				 ucore->inlen - expected_in_size))
3487 		return -EOPNOTSUPP;
3488 
3489 	wqs_handles = kcalloc(num_wq_handles, sizeof(*wqs_handles),
3490 			      GFP_KERNEL);
3491 	if (!wqs_handles)
3492 		return -ENOMEM;
3493 
3494 	err = ib_copy_from_udata(wqs_handles, ucore,
3495 				 num_wq_handles * sizeof(__u32));
3496 	if (err)
3497 		goto err_free;
3498 
3499 	wqs = kcalloc(num_wq_handles, sizeof(*wqs), GFP_KERNEL);
3500 	if (!wqs) {
3501 		err = -ENOMEM;
3502 		goto  err_free;
3503 	}
3504 
3505 	for (num_read_wqs = 0; num_read_wqs < num_wq_handles;
3506 			num_read_wqs++) {
3507 		wq = idr_read_wq(wqs_handles[num_read_wqs], file->ucontext);
3508 		if (!wq) {
3509 			err = -EINVAL;
3510 			goto put_wqs;
3511 		}
3512 
3513 		wqs[num_read_wqs] = wq;
3514 	}
3515 
3516 	uobj = kmalloc(sizeof(*uobj), GFP_KERNEL);
3517 	if (!uobj) {
3518 		err = -ENOMEM;
3519 		goto put_wqs;
3520 	}
3521 
3522 	init_uobj(uobj, 0, file->ucontext, &rwq_ind_table_lock_class);
3523 	down_write(&uobj->mutex);
3524 	init_attr.log_ind_tbl_size = cmd.log_ind_tbl_size;
3525 	init_attr.ind_tbl = wqs;
3526 	rwq_ind_tbl = ib_dev->create_rwq_ind_table(ib_dev, &init_attr, uhw);
3527 
3528 	if (IS_ERR(rwq_ind_tbl)) {
3529 		err = PTR_ERR(rwq_ind_tbl);
3530 		goto err_uobj;
3531 	}
3532 
3533 	rwq_ind_tbl->ind_tbl = wqs;
3534 	rwq_ind_tbl->log_ind_tbl_size = init_attr.log_ind_tbl_size;
3535 	rwq_ind_tbl->uobject = uobj;
3536 	uobj->object = rwq_ind_tbl;
3537 	rwq_ind_tbl->device = ib_dev;
3538 	atomic_set(&rwq_ind_tbl->usecnt, 0);
3539 
3540 	for (i = 0; i < num_wq_handles; i++)
3541 		atomic_inc(&wqs[i]->usecnt);
3542 
3543 	err = idr_add_uobj(&ib_uverbs_rwq_ind_tbl_idr, uobj);
3544 	if (err)
3545 		goto destroy_ind_tbl;
3546 
3547 	resp.ind_tbl_handle = uobj->id;
3548 	resp.ind_tbl_num = rwq_ind_tbl->ind_tbl_num;
3549 	resp.response_length = required_resp_len;
3550 
3551 	err = ib_copy_to_udata(ucore,
3552 			       &resp, resp.response_length);
3553 	if (err)
3554 		goto err_copy;
3555 
3556 	kfree(wqs_handles);
3557 
3558 	for (j = 0; j < num_read_wqs; j++)
3559 		put_wq_read(wqs[j]);
3560 
3561 	mutex_lock(&file->mutex);
3562 	list_add_tail(&uobj->list, &file->ucontext->rwq_ind_tbl_list);
3563 	mutex_unlock(&file->mutex);
3564 
3565 	uobj->live = 1;
3566 
3567 	up_write(&uobj->mutex);
3568 	return 0;
3569 
3570 err_copy:
3571 	idr_remove_uobj(&ib_uverbs_rwq_ind_tbl_idr, uobj);
3572 destroy_ind_tbl:
3573 	ib_destroy_rwq_ind_table(rwq_ind_tbl);
3574 err_uobj:
3575 	put_uobj_write(uobj);
3576 put_wqs:
3577 	for (j = 0; j < num_read_wqs; j++)
3578 		put_wq_read(wqs[j]);
3579 err_free:
3580 	kfree(wqs_handles);
3581 	kfree(wqs);
3582 	return err;
3583 }
3584 
3585 int ib_uverbs_ex_destroy_rwq_ind_table(struct ib_uverbs_file *file,
3586 				       struct ib_device *ib_dev,
3587 				       struct ib_udata *ucore,
3588 				       struct ib_udata *uhw)
3589 {
3590 	struct ib_uverbs_ex_destroy_rwq_ind_table	cmd = {};
3591 	struct ib_rwq_ind_table *rwq_ind_tbl;
3592 	struct ib_uobject		*uobj;
3593 	int			ret;
3594 	struct ib_wq	**ind_tbl;
3595 	size_t required_cmd_sz;
3596 
3597 	required_cmd_sz = offsetof(typeof(cmd), ind_tbl_handle) + sizeof(cmd.ind_tbl_handle);
3598 
3599 	if (ucore->inlen < required_cmd_sz)
3600 		return -EINVAL;
3601 
3602 	if (ucore->inlen > sizeof(cmd) &&
3603 	    !ib_is_udata_cleared(ucore, sizeof(cmd),
3604 				 ucore->inlen - sizeof(cmd)))
3605 		return -EOPNOTSUPP;
3606 
3607 	ret = ib_copy_from_udata(&cmd, ucore, min(sizeof(cmd), ucore->inlen));
3608 	if (ret)
3609 		return ret;
3610 
3611 	if (cmd.comp_mask)
3612 		return -EOPNOTSUPP;
3613 
3614 	uobj = idr_write_uobj(&ib_uverbs_rwq_ind_tbl_idr, cmd.ind_tbl_handle,
3615 			      file->ucontext);
3616 	if (!uobj)
3617 		return -EINVAL;
3618 	rwq_ind_tbl = uobj->object;
3619 	ind_tbl = rwq_ind_tbl->ind_tbl;
3620 
3621 	ret = ib_destroy_rwq_ind_table(rwq_ind_tbl);
3622 	if (!ret)
3623 		uobj->live = 0;
3624 
3625 	put_uobj_write(uobj);
3626 
3627 	if (ret)
3628 		return ret;
3629 
3630 	idr_remove_uobj(&ib_uverbs_rwq_ind_tbl_idr, uobj);
3631 
3632 	mutex_lock(&file->mutex);
3633 	list_del(&uobj->list);
3634 	mutex_unlock(&file->mutex);
3635 
3636 	put_uobj(uobj);
3637 	kfree(ind_tbl);
3638 	return ret;
3639 }
3640 
3641 int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
3642 			     struct ib_device *ib_dev,
3643 			     struct ib_udata *ucore,
3644 			     struct ib_udata *uhw)
3645 {
3646 	struct ib_uverbs_create_flow	  cmd;
3647 	struct ib_uverbs_create_flow_resp resp;
3648 	struct ib_uobject		  *uobj;
3649 	struct ib_flow			  *flow_id;
3650 	struct ib_uverbs_flow_attr	  *kern_flow_attr;
3651 	struct ib_flow_attr		  *flow_attr;
3652 	struct ib_qp			  *qp;
3653 	int err = 0;
3654 	void *kern_spec;
3655 	void *ib_spec;
3656 	int i;
3657 
3658 	if (ucore->inlen < sizeof(cmd))
3659 		return -EINVAL;
3660 
3661 	if (ucore->outlen < sizeof(resp))
3662 		return -ENOSPC;
3663 
3664 	err = ib_copy_from_udata(&cmd, ucore, sizeof(cmd));
3665 	if (err)
3666 		return err;
3667 
3668 	ucore->inbuf = (const char *)ucore->inbuf + sizeof(cmd);
3669 	ucore->inlen -= sizeof(cmd);
3670 
3671 	if (cmd.comp_mask)
3672 		return -EINVAL;
3673 
3674 	if (priv_check(curthread, PRIV_NET_RAW) != 0)
3675 		return -EPERM;
3676 
3677 	if (cmd.flow_attr.flags >= IB_FLOW_ATTR_FLAGS_RESERVED)
3678 		return -EINVAL;
3679 
3680 	if ((cmd.flow_attr.flags & IB_FLOW_ATTR_FLAGS_DONT_TRAP) &&
3681 	    ((cmd.flow_attr.type == IB_FLOW_ATTR_ALL_DEFAULT) ||
3682 	     (cmd.flow_attr.type == IB_FLOW_ATTR_MC_DEFAULT)))
3683 		return -EINVAL;
3684 
3685 	if (cmd.flow_attr.num_of_specs > IB_FLOW_SPEC_SUPPORT_LAYERS)
3686 		return -EINVAL;
3687 
3688 	if (cmd.flow_attr.size > ucore->inlen ||
3689 	    cmd.flow_attr.size >
3690 	    (cmd.flow_attr.num_of_specs * sizeof(struct ib_uverbs_flow_spec)))
3691 		return -EINVAL;
3692 
3693 	if (cmd.flow_attr.reserved[0] ||
3694 	    cmd.flow_attr.reserved[1])
3695 		return -EINVAL;
3696 
3697 	if (cmd.flow_attr.num_of_specs) {
3698 		kern_flow_attr = kmalloc(sizeof(*kern_flow_attr) + cmd.flow_attr.size,
3699 					 GFP_KERNEL);
3700 		if (!kern_flow_attr)
3701 			return -ENOMEM;
3702 
3703 		memcpy(kern_flow_attr, &cmd.flow_attr, sizeof(*kern_flow_attr));
3704 		err = ib_copy_from_udata(kern_flow_attr + 1, ucore,
3705 					 cmd.flow_attr.size);
3706 		if (err)
3707 			goto err_free_attr;
3708 	} else {
3709 		kern_flow_attr = &cmd.flow_attr;
3710 	}
3711 
3712 	uobj = kmalloc(sizeof(*uobj), GFP_KERNEL);
3713 	if (!uobj) {
3714 		err = -ENOMEM;
3715 		goto err_free_attr;
3716 	}
3717 	init_uobj(uobj, 0, file->ucontext, &rule_lock_class);
3718 	down_write(&uobj->mutex);
3719 
3720 	qp = idr_read_qp(cmd.qp_handle, file->ucontext);
3721 	if (!qp) {
3722 		err = -EINVAL;
3723 		goto err_uobj;
3724 	}
3725 
3726 	flow_attr = kzalloc(sizeof(*flow_attr) + cmd.flow_attr.num_of_specs *
3727 			    sizeof(union ib_flow_spec), GFP_KERNEL);
3728 	if (!flow_attr) {
3729 		err = -ENOMEM;
3730 		goto err_put;
3731 	}
3732 
3733 	flow_attr->type = kern_flow_attr->type;
3734 	flow_attr->priority = kern_flow_attr->priority;
3735 	flow_attr->num_of_specs = kern_flow_attr->num_of_specs;
3736 	flow_attr->port = kern_flow_attr->port;
3737 	flow_attr->flags = kern_flow_attr->flags;
3738 	flow_attr->size = sizeof(*flow_attr);
3739 
3740 	kern_spec = kern_flow_attr + 1;
3741 	ib_spec = flow_attr + 1;
3742 	for (i = 0; i < flow_attr->num_of_specs &&
3743 	     cmd.flow_attr.size > offsetof(struct ib_uverbs_flow_spec, reserved) &&
3744 	     cmd.flow_attr.size >=
3745 	     ((struct ib_uverbs_flow_spec *)kern_spec)->size; i++) {
3746 		err = kern_spec_to_ib_spec(kern_spec, ib_spec);
3747 		if (err)
3748 			goto err_free;
3749 		flow_attr->size +=
3750 			((union ib_flow_spec *) ib_spec)->size;
3751 		cmd.flow_attr.size -= ((struct ib_uverbs_flow_spec *)kern_spec)->size;
3752 		kern_spec = (char *)kern_spec + ((struct ib_uverbs_flow_spec *) kern_spec)->size;
3753 		ib_spec = (char *)ib_spec + ((union ib_flow_spec *)ib_spec)->size;
3754 	}
3755 	if (cmd.flow_attr.size || (i != flow_attr->num_of_specs)) {
3756 		pr_warn("create flow failed, flow %d: %d bytes left from uverb cmd\n",
3757 			i, cmd.flow_attr.size);
3758 		err = -EINVAL;
3759 		goto err_free;
3760 	}
3761 	flow_id = ib_create_flow(qp, flow_attr, IB_FLOW_DOMAIN_USER);
3762 	if (IS_ERR(flow_id)) {
3763 		err = PTR_ERR(flow_id);
3764 		goto err_free;
3765 	}
3766 	flow_id->qp = qp;
3767 	flow_id->uobject = uobj;
3768 	uobj->object = flow_id;
3769 
3770 	err = idr_add_uobj(&ib_uverbs_rule_idr, uobj);
3771 	if (err)
3772 		goto destroy_flow;
3773 
3774 	memset(&resp, 0, sizeof(resp));
3775 	resp.flow_handle = uobj->id;
3776 
3777 	err = ib_copy_to_udata(ucore,
3778 			       &resp, sizeof(resp));
3779 	if (err)
3780 		goto err_copy;
3781 
3782 	put_qp_read(qp);
3783 	mutex_lock(&file->mutex);
3784 	list_add_tail(&uobj->list, &file->ucontext->rule_list);
3785 	mutex_unlock(&file->mutex);
3786 
3787 	uobj->live = 1;
3788 
3789 	up_write(&uobj->mutex);
3790 	kfree(flow_attr);
3791 	if (cmd.flow_attr.num_of_specs)
3792 		kfree(kern_flow_attr);
3793 	return 0;
3794 err_copy:
3795 	idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
3796 destroy_flow:
3797 	ib_destroy_flow(flow_id);
3798 err_free:
3799 	kfree(flow_attr);
3800 err_put:
3801 	put_qp_read(qp);
3802 err_uobj:
3803 	put_uobj_write(uobj);
3804 err_free_attr:
3805 	if (cmd.flow_attr.num_of_specs)
3806 		kfree(kern_flow_attr);
3807 	return err;
3808 }
3809 
3810 int ib_uverbs_ex_destroy_flow(struct ib_uverbs_file *file,
3811 			      struct ib_device *ib_dev,
3812 			      struct ib_udata *ucore,
3813 			      struct ib_udata *uhw)
3814 {
3815 	struct ib_uverbs_destroy_flow	cmd;
3816 	struct ib_flow			*flow_id;
3817 	struct ib_uobject		*uobj;
3818 	int				ret;
3819 
3820 	if (ucore->inlen < sizeof(cmd))
3821 		return -EINVAL;
3822 
3823 	ret = ib_copy_from_udata(&cmd, ucore, sizeof(cmd));
3824 	if (ret)
3825 		return ret;
3826 
3827 	if (cmd.comp_mask)
3828 		return -EINVAL;
3829 
3830 	uobj = idr_write_uobj(&ib_uverbs_rule_idr, cmd.flow_handle,
3831 			      file->ucontext);
3832 	if (!uobj)
3833 		return -EINVAL;
3834 	flow_id = uobj->object;
3835 
3836 	ret = ib_destroy_flow(flow_id);
3837 	if (!ret)
3838 		uobj->live = 0;
3839 
3840 	put_uobj_write(uobj);
3841 
3842 	idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
3843 
3844 	mutex_lock(&file->mutex);
3845 	list_del(&uobj->list);
3846 	mutex_unlock(&file->mutex);
3847 
3848 	put_uobj(uobj);
3849 
3850 	return ret;
3851 }
3852 
3853 static int __uverbs_create_xsrq(struct ib_uverbs_file *file,
3854 				struct ib_device *ib_dev,
3855 				struct ib_uverbs_create_xsrq *cmd,
3856 				struct ib_udata *udata)
3857 {
3858 	struct ib_uverbs_create_srq_resp resp;
3859 	struct ib_usrq_object           *obj;
3860 	struct ib_pd                    *pd;
3861 	struct ib_srq                   *srq;
3862 	struct ib_uobject               *uninitialized_var(xrcd_uobj);
3863 	struct ib_srq_init_attr          attr;
3864 	int ret;
3865 
3866 	obj = kmalloc(sizeof *obj, GFP_KERNEL);
3867 	if (!obj)
3868 		return -ENOMEM;
3869 
3870 	init_uobj(&obj->uevent.uobject, cmd->user_handle, file->ucontext, &srq_lock_class);
3871 	down_write(&obj->uevent.uobject.mutex);
3872 
3873 	if (cmd->srq_type == IB_SRQT_XRC) {
3874 		attr.ext.xrc.xrcd  = idr_read_xrcd(cmd->xrcd_handle, file->ucontext, &xrcd_uobj);
3875 		if (!attr.ext.xrc.xrcd) {
3876 			ret = -EINVAL;
3877 			goto err;
3878 		}
3879 
3880 		obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, uobject);
3881 		atomic_inc(&obj->uxrcd->refcnt);
3882 
3883 		attr.ext.xrc.cq  = idr_read_cq(cmd->cq_handle, file->ucontext, 0);
3884 		if (!attr.ext.xrc.cq) {
3885 			ret = -EINVAL;
3886 			goto err_put_xrcd;
3887 		}
3888 	}
3889 
3890 	pd  = idr_read_pd(cmd->pd_handle, file->ucontext);
3891 	if (!pd) {
3892 		ret = -EINVAL;
3893 		goto err_put_cq;
3894 	}
3895 
3896 	attr.event_handler  = ib_uverbs_srq_event_handler;
3897 	attr.srq_context    = file;
3898 	attr.srq_type       = cmd->srq_type;
3899 	attr.attr.max_wr    = cmd->max_wr;
3900 	attr.attr.max_sge   = cmd->max_sge;
3901 	attr.attr.srq_limit = cmd->srq_limit;
3902 
3903 	obj->uevent.events_reported = 0;
3904 	INIT_LIST_HEAD(&obj->uevent.event_list);
3905 
3906 	srq = pd->device->create_srq(pd, &attr, udata);
3907 	if (IS_ERR(srq)) {
3908 		ret = PTR_ERR(srq);
3909 		goto err_put;
3910 	}
3911 
3912 	srq->device        = pd->device;
3913 	srq->pd            = pd;
3914 	srq->srq_type	   = cmd->srq_type;
3915 	srq->uobject       = &obj->uevent.uobject;
3916 	srq->event_handler = attr.event_handler;
3917 	srq->srq_context   = attr.srq_context;
3918 
3919 	if (cmd->srq_type == IB_SRQT_XRC) {
3920 		srq->ext.xrc.cq   = attr.ext.xrc.cq;
3921 		srq->ext.xrc.xrcd = attr.ext.xrc.xrcd;
3922 		atomic_inc(&attr.ext.xrc.cq->usecnt);
3923 		atomic_inc(&attr.ext.xrc.xrcd->usecnt);
3924 	}
3925 
3926 	atomic_inc(&pd->usecnt);
3927 	atomic_set(&srq->usecnt, 0);
3928 
3929 	obj->uevent.uobject.object = srq;
3930 	ret = idr_add_uobj(&ib_uverbs_srq_idr, &obj->uevent.uobject);
3931 	if (ret)
3932 		goto err_destroy;
3933 
3934 	memset(&resp, 0, sizeof resp);
3935 	resp.srq_handle = obj->uevent.uobject.id;
3936 	resp.max_wr     = attr.attr.max_wr;
3937 	resp.max_sge    = attr.attr.max_sge;
3938 	if (cmd->srq_type == IB_SRQT_XRC)
3939 		resp.srqn = srq->ext.xrc.srq_num;
3940 
3941 	if (copy_to_user((void __user *) (unsigned long) cmd->response,
3942 			 &resp, sizeof resp)) {
3943 		ret = -EFAULT;
3944 		goto err_copy;
3945 	}
3946 
3947 	if (cmd->srq_type == IB_SRQT_XRC) {
3948 		put_uobj_read(xrcd_uobj);
3949 		put_cq_read(attr.ext.xrc.cq);
3950 	}
3951 	put_pd_read(pd);
3952 
3953 	mutex_lock(&file->mutex);
3954 	list_add_tail(&obj->uevent.uobject.list, &file->ucontext->srq_list);
3955 	mutex_unlock(&file->mutex);
3956 
3957 	obj->uevent.uobject.live = 1;
3958 
3959 	up_write(&obj->uevent.uobject.mutex);
3960 
3961 	return 0;
3962 
3963 err_copy:
3964 	idr_remove_uobj(&ib_uverbs_srq_idr, &obj->uevent.uobject);
3965 
3966 err_destroy:
3967 	ib_destroy_srq(srq);
3968 
3969 err_put:
3970 	put_pd_read(pd);
3971 
3972 err_put_cq:
3973 	if (cmd->srq_type == IB_SRQT_XRC)
3974 		put_cq_read(attr.ext.xrc.cq);
3975 
3976 err_put_xrcd:
3977 	if (cmd->srq_type == IB_SRQT_XRC) {
3978 		atomic_dec(&obj->uxrcd->refcnt);
3979 		put_uobj_read(xrcd_uobj);
3980 	}
3981 
3982 err:
3983 	put_uobj_write(&obj->uevent.uobject);
3984 	return ret;
3985 }
3986 
3987 ssize_t ib_uverbs_create_srq(struct ib_uverbs_file *file,
3988 			     struct ib_device *ib_dev,
3989 			     const char __user *buf, int in_len,
3990 			     int out_len)
3991 {
3992 	struct ib_uverbs_create_srq      cmd;
3993 	struct ib_uverbs_create_xsrq     xcmd;
3994 	struct ib_uverbs_create_srq_resp resp;
3995 	struct ib_udata                  udata;
3996 	int ret;
3997 
3998 	if (out_len < sizeof resp)
3999 		return -ENOSPC;
4000 
4001 	if (copy_from_user(&cmd, buf, sizeof cmd))
4002 		return -EFAULT;
4003 
4004 	xcmd.response	 = cmd.response;
4005 	xcmd.user_handle = cmd.user_handle;
4006 	xcmd.srq_type	 = IB_SRQT_BASIC;
4007 	xcmd.pd_handle	 = cmd.pd_handle;
4008 	xcmd.max_wr	 = cmd.max_wr;
4009 	xcmd.max_sge	 = cmd.max_sge;
4010 	xcmd.srq_limit	 = cmd.srq_limit;
4011 
4012 	INIT_UDATA(&udata, buf + sizeof cmd,
4013 		   (unsigned long) cmd.response + sizeof resp,
4014 		   in_len - sizeof cmd - sizeof(struct ib_uverbs_cmd_hdr),
4015 		   out_len - sizeof resp);
4016 
4017 	ret = __uverbs_create_xsrq(file, ib_dev, &xcmd, &udata);
4018 	if (ret)
4019 		return ret;
4020 
4021 	return in_len;
4022 }
4023 
4024 ssize_t ib_uverbs_create_xsrq(struct ib_uverbs_file *file,
4025 			      struct ib_device *ib_dev,
4026 			      const char __user *buf, int in_len, int out_len)
4027 {
4028 	struct ib_uverbs_create_xsrq     cmd;
4029 	struct ib_uverbs_create_srq_resp resp;
4030 	struct ib_udata                  udata;
4031 	int ret;
4032 
4033 	if (out_len < sizeof resp)
4034 		return -ENOSPC;
4035 
4036 	if (copy_from_user(&cmd, buf, sizeof cmd))
4037 		return -EFAULT;
4038 
4039 	INIT_UDATA(&udata, buf + sizeof cmd,
4040 		   (unsigned long) cmd.response + sizeof resp,
4041 		   in_len - sizeof cmd - sizeof(struct ib_uverbs_cmd_hdr),
4042 		   out_len - sizeof resp);
4043 
4044 	ret = __uverbs_create_xsrq(file, ib_dev, &cmd, &udata);
4045 	if (ret)
4046 		return ret;
4047 
4048 	return in_len;
4049 }
4050 
4051 ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
4052 			     struct ib_device *ib_dev,
4053 			     const char __user *buf, int in_len,
4054 			     int out_len)
4055 {
4056 	struct ib_uverbs_modify_srq cmd;
4057 	struct ib_udata             udata;
4058 	struct ib_srq              *srq;
4059 	struct ib_srq_attr          attr;
4060 	int                         ret;
4061 
4062 	if (copy_from_user(&cmd, buf, sizeof cmd))
4063 		return -EFAULT;
4064 
4065 	INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
4066 		   out_len);
4067 
4068 	srq = idr_read_srq(cmd.srq_handle, file->ucontext);
4069 	if (!srq)
4070 		return -EINVAL;
4071 
4072 	attr.max_wr    = cmd.max_wr;
4073 	attr.srq_limit = cmd.srq_limit;
4074 
4075 	ret = srq->device->modify_srq(srq, &attr, cmd.attr_mask, &udata);
4076 
4077 	put_srq_read(srq);
4078 
4079 	return ret ? ret : in_len;
4080 }
4081 
4082 ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
4083 			    struct ib_device *ib_dev,
4084 			    const char __user *buf,
4085 			    int in_len, int out_len)
4086 {
4087 	struct ib_uverbs_query_srq      cmd;
4088 	struct ib_uverbs_query_srq_resp resp;
4089 	struct ib_srq_attr              attr;
4090 	struct ib_srq                   *srq;
4091 	int                             ret;
4092 
4093 	if (out_len < sizeof resp)
4094 		return -ENOSPC;
4095 
4096 	if (copy_from_user(&cmd, buf, sizeof cmd))
4097 		return -EFAULT;
4098 
4099 	srq = idr_read_srq(cmd.srq_handle, file->ucontext);
4100 	if (!srq)
4101 		return -EINVAL;
4102 
4103 	ret = ib_query_srq(srq, &attr);
4104 
4105 	put_srq_read(srq);
4106 
4107 	if (ret)
4108 		return ret;
4109 
4110 	memset(&resp, 0, sizeof resp);
4111 
4112 	resp.max_wr    = attr.max_wr;
4113 	resp.max_sge   = attr.max_sge;
4114 	resp.srq_limit = attr.srq_limit;
4115 
4116 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
4117 			 &resp, sizeof resp))
4118 		return -EFAULT;
4119 
4120 	return in_len;
4121 }
4122 
4123 ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
4124 			      struct ib_device *ib_dev,
4125 			      const char __user *buf, int in_len,
4126 			      int out_len)
4127 {
4128 	struct ib_uverbs_destroy_srq      cmd;
4129 	struct ib_uverbs_destroy_srq_resp resp;
4130 	struct ib_uobject		 *uobj;
4131 	struct ib_srq               	 *srq;
4132 	struct ib_uevent_object        	 *obj;
4133 	int                         	  ret = -EINVAL;
4134 	struct ib_usrq_object		 *us;
4135 	enum ib_srq_type		  srq_type;
4136 
4137 	if (copy_from_user(&cmd, buf, sizeof cmd))
4138 		return -EFAULT;
4139 
4140 	uobj = idr_write_uobj(&ib_uverbs_srq_idr, cmd.srq_handle, file->ucontext);
4141 	if (!uobj)
4142 		return -EINVAL;
4143 	srq = uobj->object;
4144 	obj = container_of(uobj, struct ib_uevent_object, uobject);
4145 	srq_type = srq->srq_type;
4146 
4147 	ret = ib_destroy_srq(srq);
4148 	if (!ret)
4149 		uobj->live = 0;
4150 
4151 	put_uobj_write(uobj);
4152 
4153 	if (ret)
4154 		return ret;
4155 
4156 	if (srq_type == IB_SRQT_XRC) {
4157 		us = container_of(obj, struct ib_usrq_object, uevent);
4158 		atomic_dec(&us->uxrcd->refcnt);
4159 	}
4160 
4161 	idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
4162 
4163 	mutex_lock(&file->mutex);
4164 	list_del(&uobj->list);
4165 	mutex_unlock(&file->mutex);
4166 
4167 	ib_uverbs_release_uevent(file, obj);
4168 
4169 	memset(&resp, 0, sizeof resp);
4170 	resp.events_reported = obj->events_reported;
4171 
4172 	put_uobj(uobj);
4173 
4174 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
4175 			 &resp, sizeof resp))
4176 		ret = -EFAULT;
4177 
4178 	return ret ? ret : in_len;
4179 }
4180 
4181 int ib_uverbs_ex_query_device(struct ib_uverbs_file *file,
4182 			      struct ib_device *ib_dev,
4183 			      struct ib_udata *ucore,
4184 			      struct ib_udata *uhw)
4185 {
4186 	struct ib_uverbs_ex_query_device_resp resp = { {0} };
4187 	struct ib_uverbs_ex_query_device  cmd;
4188 	struct ib_device_attr attr = {0};
4189 	int err;
4190 
4191 	if (ucore->inlen < sizeof(cmd))
4192 		return -EINVAL;
4193 
4194 	err = ib_copy_from_udata(&cmd, ucore, sizeof(cmd));
4195 	if (err)
4196 		return err;
4197 
4198 	if (cmd.comp_mask)
4199 		return -EINVAL;
4200 
4201 	if (cmd.reserved)
4202 		return -EINVAL;
4203 
4204 	resp.response_length = offsetof(typeof(resp), odp_caps);
4205 
4206 	if (ucore->outlen < resp.response_length)
4207 		return -ENOSPC;
4208 
4209 	err = ib_dev->query_device(ib_dev, &attr, uhw);
4210 	if (err)
4211 		return err;
4212 
4213 	copy_query_dev_fields(file, ib_dev, &resp.base, &attr);
4214 
4215 	if (ucore->outlen < resp.response_length + sizeof(resp.odp_caps))
4216 		goto end;
4217 
4218 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
4219 	resp.odp_caps.general_caps = attr.odp_caps.general_caps;
4220 	resp.odp_caps.per_transport_caps.rc_odp_caps =
4221 		attr.odp_caps.per_transport_caps.rc_odp_caps;
4222 	resp.odp_caps.per_transport_caps.uc_odp_caps =
4223 		attr.odp_caps.per_transport_caps.uc_odp_caps;
4224 	resp.odp_caps.per_transport_caps.ud_odp_caps =
4225 		attr.odp_caps.per_transport_caps.ud_odp_caps;
4226 #endif
4227 	resp.response_length += sizeof(resp.odp_caps);
4228 
4229 	if (ucore->outlen < resp.response_length + sizeof(resp.timestamp_mask))
4230 		goto end;
4231 
4232 	resp.timestamp_mask = attr.timestamp_mask;
4233 	resp.response_length += sizeof(resp.timestamp_mask);
4234 
4235 	if (ucore->outlen < resp.response_length + sizeof(resp.hca_core_clock))
4236 		goto end;
4237 
4238 	resp.hca_core_clock = attr.hca_core_clock;
4239 	resp.response_length += sizeof(resp.hca_core_clock);
4240 
4241 	if (ucore->outlen < resp.response_length + sizeof(resp.device_cap_flags_ex))
4242 		goto end;
4243 
4244 	resp.device_cap_flags_ex = attr.device_cap_flags;
4245 	resp.response_length += sizeof(resp.device_cap_flags_ex);
4246 
4247 	if (ucore->outlen < resp.response_length + sizeof(resp.rss_caps))
4248 		goto end;
4249 
4250 	resp.rss_caps.supported_qpts = attr.rss_caps.supported_qpts;
4251 	resp.rss_caps.max_rwq_indirection_tables =
4252 		attr.rss_caps.max_rwq_indirection_tables;
4253 	resp.rss_caps.max_rwq_indirection_table_size =
4254 		attr.rss_caps.max_rwq_indirection_table_size;
4255 
4256 	resp.response_length += sizeof(resp.rss_caps);
4257 
4258 	if (ucore->outlen < resp.response_length + sizeof(resp.max_wq_type_rq))
4259 		goto end;
4260 
4261 	resp.max_wq_type_rq = attr.max_wq_type_rq;
4262 	resp.response_length += sizeof(resp.max_wq_type_rq);
4263 end:
4264 	err = ib_copy_to_udata(ucore, &resp, resp.response_length);
4265 	return err;
4266 }
4267