drivers/infiniband/core/uverbs_cmd.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006, 2007 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 PathScale, Inc.  All rights reserved.
   5  * Copyright (c) 2006 Mellanox Technologies.  All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/file.h>
  37 #include <linux/fs.h>
  38 #include <linux/slab.h>
  39
  40 #include <asm/uaccess.h>
  41
  42 #include "uverbs.h"
  43 #include "core_priv.h"
  44
  45 struct uverbs_lock_class {
  46         struct lock_class_key   key;
  47         char                    name[16];
  48 };
  49
  50 static struct uverbs_lock_class pd_lock_class   = { .name = "PD-uobj" };
  51 static struct uverbs_lock_class mr_lock_class   = { .name = "MR-uobj" };
  52 static struct uverbs_lock_class mw_lock_class   = { .name = "MW-uobj" };
  53 static struct uverbs_lock_class cq_lock_class   = { .name = "CQ-uobj" };
  54 static struct uverbs_lock_class qp_lock_class   = { .name = "QP-uobj" };
  55 static struct uverbs_lock_class ah_lock_class   = { .name = "AH-uobj" };
  56 static struct uverbs_lock_class srq_lock_class  = { .name = "SRQ-uobj" };
  57 static struct uverbs_lock_class xrcd_lock_class = { .name = "XRCD-uobj" };
  58 static struct uverbs_lock_class rule_lock_class = { .name = "RULE-uobj" };
  59
  60 /*
  61  * The ib_uobject locking scheme is as follows:
  62  *
  63  * - ib_uverbs_idr_lock protects the uverbs idrs themselves, so it
  64  *   needs to be held during all idr operations.  When an object is
  65  *   looked up, a reference must be taken on the object's kref before
  66  *   dropping this lock.
  67  *
  68  * - Each object also has an rwsem.  This rwsem must be held for
  69  *   reading while an operation that uses the object is performed.
  70  *   For example, while registering an MR, the associated PD's
  71  *   uobject.mutex must be held for reading.  The rwsem must be held
  72  *   for writing while initializing or destroying an object.
  73  *
  74  * - In addition, each object has a "live" flag.  If this flag is not
  75  *   set, then lookups of the object will fail even if it is found in
  76  *   the idr.  This handles a reader that blocks and does not acquire
  77  *   the rwsem until after the object is destroyed.  The destroy
  78  *   operation will set the live flag to 0 and then drop the rwsem;
  79  *   this will allow the reader to acquire the rwsem, see that the
  80  *   live flag is 0, and then drop the rwsem and its reference to
  81  *   object.  The underlying storage will not be freed until the last
  82  *   reference to the object is dropped.
  83  */
  84
  85 static void init_uobj(struct ib_uobject *uobj, u64 user_handle,
  86                       struct ib_ucontext *context, struct uverbs_lock_class *c)
  87 {
  88         uobj->user_handle = user_handle;
  89         uobj->context     = context;
  90         kref_init(&uobj->ref);
  91         init_rwsem(&uobj->mutex);
  92         lockdep_set_class_and_name(&uobj->mutex, &c->key, c->name);
  93         uobj->live        = 0;
  94 }
  95
  96 static void release_uobj(struct kref *kref)
  97 {
  98         kfree(container_of(kref, struct ib_uobject, ref));
  99 }
 100
 101 static void put_uobj(struct ib_uobject *uobj)
 102 {
 103         kref_put(&uobj->ref, release_uobj);
 104 }
 105
 106 static void put_uobj_read(struct ib_uobject *uobj)
 107 {
 108         up_read(&uobj->mutex);
 109         put_uobj(uobj);
 110 }
 111
 112 static void put_uobj_write(struct ib_uobject *uobj)
 113 {
 114         up_write(&uobj->mutex);
 115         put_uobj(uobj);
 116 }
 117
 118 static int idr_add_uobj(struct idr *idr, struct ib_uobject *uobj)
 119 {
 120         int ret;
 121
 122         idr_preload(GFP_KERNEL);
 123         spin_lock(&ib_uverbs_idr_lock);
 124
 125         ret = idr_alloc(idr, uobj, 0, 0, GFP_NOWAIT);
 126         if (ret >= 0)
 127                 uobj->id = ret;
 128
 129         spin_unlock(&ib_uverbs_idr_lock);
 130         idr_preload_end();
 131
 132         return ret < 0 ? ret : 0;
 133 }
 134
 135 void idr_remove_uobj(struct idr *idr, struct ib_uobject *uobj)
 136 {
 137         spin_lock(&ib_uverbs_idr_lock);
 138         idr_remove(idr, uobj->id);
 139         spin_unlock(&ib_uverbs_idr_lock);
 140 }
 141
 142 static struct ib_uobject *__idr_get_uobj(struct idr *idr, int id,
 143                                          struct ib_ucontext *context)
 144 {
 145         struct ib_uobject *uobj;
 146
 147         spin_lock(&ib_uverbs_idr_lock);
 148         uobj = idr_find(idr, id);
 149         if (uobj) {
 150                 if (uobj->context == context)
 151                         kref_get(&uobj->ref);
 152                 else
 153                         uobj = NULL;
 154         }
 155         spin_unlock(&ib_uverbs_idr_lock);
 156
 157         return uobj;
 158 }
 159
 160 static struct ib_uobject *idr_read_uobj(struct idr *idr, int id,
 161                                         struct ib_ucontext *context, int nested)
 162 {
 163         struct ib_uobject *uobj;
 164
 165         uobj = __idr_get_uobj(idr, id, context);
 166         if (!uobj)
 167                 return NULL;
 168
 169         if (nested)
 170                 down_read_nested(&uobj->mutex, SINGLE_DEPTH_NESTING);
 171         else
 172                 down_read(&uobj->mutex);
 173         if (!uobj->live) {
 174                 put_uobj_read(uobj);
 175                 return NULL;
 176         }
 177
 178         return uobj;
 179 }
 180
 181 static struct ib_uobject *idr_write_uobj(struct idr *idr, int id,
 182                                          struct ib_ucontext *context)
 183 {
 184         struct ib_uobject *uobj;
 185
 186         uobj = __idr_get_uobj(idr, id, context);
 187         if (!uobj)
 188                 return NULL;
 189
 190         down_write(&uobj->mutex);
 191         if (!uobj->live) {
 192                 put_uobj_write(uobj);
 193                 return NULL;
 194         }
 195
 196         return uobj;
 197 }
 198
 199 static void *idr_read_obj(struct idr *idr, int id, struct ib_ucontext *context,
 200                           int nested)
 201 {
 202         struct ib_uobject *uobj;
 203
 204         uobj = idr_read_uobj(idr, id, context, nested);
 205         return uobj ? uobj->object : NULL;
 206 }
 207
 208 static struct ib_pd *idr_read_pd(int pd_handle, struct ib_ucontext *context)
 209 {
 210         return idr_read_obj(&ib_uverbs_pd_idr, pd_handle, context, 0);
 211 }
 212
 213 static void put_pd_read(struct ib_pd *pd)
 214 {
 215         put_uobj_read(pd->uobject);
 216 }
 217
 218 static struct ib_cq *idr_read_cq(int cq_handle, struct ib_ucontext *context, int nested)
 219 {
 220         return idr_read_obj(&ib_uverbs_cq_idr, cq_handle, context, nested);
 221 }
 222
 223 static void put_cq_read(struct ib_cq *cq)
 224 {
 225         put_uobj_read(cq->uobject);
 226 }
 227
 228 static struct ib_ah *idr_read_ah(int ah_handle, struct ib_ucontext *context)
 229 {
 230         return idr_read_obj(&ib_uverbs_ah_idr, ah_handle, context, 0);
 231 }
 232
 233 static void put_ah_read(struct ib_ah *ah)
 234 {
 235         put_uobj_read(ah->uobject);
 236 }
 237
 238 static struct ib_qp *idr_read_qp(int qp_handle, struct ib_ucontext *context)
 239 {
 240         return idr_read_obj(&ib_uverbs_qp_idr, qp_handle, context, 0);
 241 }
 242
 243 static struct ib_qp *idr_write_qp(int qp_handle, struct ib_ucontext *context)
 244 {
 245         struct ib_uobject *uobj;
 246
 247         uobj = idr_write_uobj(&ib_uverbs_qp_idr, qp_handle, context);
 248         return uobj ? uobj->object : NULL;
 249 }
 250
 251 static void put_qp_read(struct ib_qp *qp)
 252 {
 253         put_uobj_read(qp->uobject);
 254 }
 255
 256 static void put_qp_write(struct ib_qp *qp)
 257 {
 258         put_uobj_write(qp->uobject);
 259 }
 260
 261 static struct ib_srq *idr_read_srq(int srq_handle, struct ib_ucontext *context)
 262 {
 263         return idr_read_obj(&ib_uverbs_srq_idr, srq_handle, context, 0);
 264 }
 265
 266 static void put_srq_read(struct ib_srq *srq)
 267 {
 268         put_uobj_read(srq->uobject);
 269 }
 270
 271 static struct ib_xrcd *idr_read_xrcd(int xrcd_handle, struct ib_ucontext *context,
 272                                      struct ib_uobject **uobj)
 273 {
 274         *uobj = idr_read_uobj(&ib_uverbs_xrcd_idr, xrcd_handle, context, 0);
 275         return *uobj ? (*uobj)->object : NULL;
 276 }
 277
 278 static void put_xrcd_read(struct ib_uobject *uobj)
 279 {
 280         put_uobj_read(uobj);
 281 }
 282
 283 ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
 284                               const char __user *buf,
 285                               int in_len, int out_len)
 286 {
 287         struct ib_uverbs_get_context      cmd;
 288         struct ib_uverbs_get_context_resp resp;
 289         struct ib_udata                   udata;
 290         struct ib_device                 *ibdev = file->device->ib_dev;
 291         struct ib_ucontext               *ucontext;
 292         struct file                      *filp;
 293         int ret;
 294
 295         if (out_len < sizeof resp)
 296                 return -ENOSPC;
 297
 298         if (copy_from_user(&cmd, buf, sizeof cmd))
 299                 return -EFAULT;
 300
 301         mutex_lock(&file->mutex);
 302
 303         if (file->ucontext) {
 304                 ret = -EINVAL;
 305                 goto err;
 306         }
 307
 308         INIT_UDATA(&udata, buf + sizeof cmd,
 309                    (unsigned long) cmd.response + sizeof resp,
 310                    in_len - sizeof cmd, out_len - sizeof resp);
 311
 312         ucontext = ibdev->alloc_ucontext(ibdev, &udata);
 313         if (IS_ERR(ucontext)) {
 314                 ret = PTR_ERR(ucontext);
 315                 goto err;
 316         }
 317
 318         ucontext->device = ibdev;
 319         INIT_LIST_HEAD(&ucontext->pd_list);
 320         INIT_LIST_HEAD(&ucontext->mr_list);
 321         INIT_LIST_HEAD(&ucontext->mw_list);
 322         INIT_LIST_HEAD(&ucontext->cq_list);
 323         INIT_LIST_HEAD(&ucontext->qp_list);
 324         INIT_LIST_HEAD(&ucontext->srq_list);
 325         INIT_LIST_HEAD(&ucontext->ah_list);
 326         INIT_LIST_HEAD(&ucontext->xrcd_list);
 327         INIT_LIST_HEAD(&ucontext->rule_list);
 328         ucontext->closing = 0;
 329
 330         resp.num_comp_vectors = file->device->num_comp_vectors;
 331
 332         ret = get_unused_fd_flags(O_CLOEXEC);
 333         if (ret < 0)
 334                 goto err_free;
 335         resp.async_fd = ret;
 336
 337         filp = ib_uverbs_alloc_event_file(file, 1);
 338         if (IS_ERR(filp)) {
 339                 ret = PTR_ERR(filp);
 340                 goto err_fd;
 341         }
 342
 343         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 344                          &resp, sizeof resp)) {
 345                 ret = -EFAULT;
 346                 goto err_file;
 347         }
 348
 349         file->async_file = filp->private_data;
 350
 351         INIT_IB_EVENT_HANDLER(&file->event_handler, file->device->ib_dev,
 352                               ib_uverbs_event_handler);
 353         ret = ib_register_event_handler(&file->event_handler);
 354         if (ret)
 355                 goto err_file;
 356
 357         kref_get(&file->async_file->ref);
 358         kref_get(&file->ref);
 359         file->ucontext = ucontext;
 360
 361         fd_install(resp.async_fd, filp);
 362
 363         mutex_unlock(&file->mutex);
 364
 365         return in_len;
 366
 367 err_file:
 368         fput(filp);
 369
 370 err_fd:
 371         put_unused_fd(resp.async_fd);
 372
 373 err_free:
 374         ibdev->dealloc_ucontext(ucontext);
 375
 376 err:
 377         mutex_unlock(&file->mutex);
 378         return ret;
 379 }
 380
 381 ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
 382                                const char __user *buf,
 383                                int in_len, int out_len)
 384 {
 385         struct ib_uverbs_query_device      cmd;
 386         struct ib_uverbs_query_device_resp resp;
 387         struct ib_device_attr              attr;
 388         int                                ret;
 389
 390         if (out_len < sizeof resp)
 391                 return -ENOSPC;
 392
 393         if (copy_from_user(&cmd, buf, sizeof cmd))
 394                 return -EFAULT;
 395
 396         ret = ib_query_device(file->device->ib_dev, &attr);
 397         if (ret)
 398                 return ret;
 399
 400         memset(&resp, 0, sizeof resp);
 401
 402         resp.fw_ver                    = attr.fw_ver;
 403         resp.node_guid                 = file->device->ib_dev->node_guid;
 404         resp.sys_image_guid            = attr.sys_image_guid;
 405         resp.max_mr_size               = attr.max_mr_size;
 406         resp.page_size_cap             = attr.page_size_cap;
 407         resp.vendor_id                 = attr.vendor_id;
 408         resp.vendor_part_id            = attr.vendor_part_id;
 409         resp.hw_ver                    = attr.hw_ver;
 410         resp.max_qp                    = attr.max_qp;
 411         resp.max_qp_wr                 = attr.max_qp_wr;
 412         resp.device_cap_flags          = attr.device_cap_flags;
 413         resp.max_sge                   = attr.max_sge;
 414         resp.max_sge_rd                = attr.max_sge_rd;
 415         resp.max_cq                    = attr.max_cq;
 416         resp.max_cqe                   = attr.max_cqe;
 417         resp.max_mr                    = attr.max_mr;
 418         resp.max_pd                    = attr.max_pd;
 419         resp.max_qp_rd_atom            = attr.max_qp_rd_atom;
 420         resp.max_ee_rd_atom            = attr.max_ee_rd_atom;
 421         resp.max_res_rd_atom           = attr.max_res_rd_atom;
 422         resp.max_qp_init_rd_atom       = attr.max_qp_init_rd_atom;
 423         resp.max_ee_init_rd_atom       = attr.max_ee_init_rd_atom;
 424         resp.atomic_cap                = attr.atomic_cap;
 425         resp.max_ee                    = attr.max_ee;
 426         resp.max_rdd                   = attr.max_rdd;
 427         resp.max_mw                    = attr.max_mw;
 428         resp.max_raw_ipv6_qp           = attr.max_raw_ipv6_qp;
 429         resp.max_raw_ethy_qp           = attr.max_raw_ethy_qp;
 430         resp.max_mcast_grp             = attr.max_mcast_grp;
 431         resp.max_mcast_qp_attach       = attr.max_mcast_qp_attach;
 432         resp.max_total_mcast_qp_attach = attr.max_total_mcast_qp_attach;
 433         resp.max_ah                    = attr.max_ah;
 434         resp.max_fmr                   = attr.max_fmr;
 435         resp.max_map_per_fmr           = attr.max_map_per_fmr;
 436         resp.max_srq                   = attr.max_srq;
 437         resp.max_srq_wr                = attr.max_srq_wr;
 438         resp.max_srq_sge               = attr.max_srq_sge;
 439         resp.max_pkeys                 = attr.max_pkeys;
 440         resp.local_ca_ack_delay        = attr.local_ca_ack_delay;
 441         resp.phys_port_cnt             = file->device->ib_dev->phys_port_cnt;
 442
 443         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 444                          &resp, sizeof resp))
 445                 return -EFAULT;
 446
 447         return in_len;
 448 }
 449
 450 ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
 451                              const char __user *buf,
 452                              int in_len, int out_len)
 453 {
 454         struct ib_uverbs_query_port      cmd;
 455         struct ib_uverbs_query_port_resp resp;
 456         struct ib_port_attr              attr;
 457         int                              ret;
 458
 459         if (out_len < sizeof resp)
 460                 return -ENOSPC;
 461
 462         if (copy_from_user(&cmd, buf, sizeof cmd))
 463                 return -EFAULT;
 464
 465         ret = ib_query_port(file->device->ib_dev, cmd.port_num, &attr);
 466         if (ret)
 467                 return ret;
 468
 469         memset(&resp, 0, sizeof resp);
 470
 471         resp.state           = attr.state;
 472         resp.max_mtu         = attr.max_mtu;
 473         resp.active_mtu      = attr.active_mtu;
 474         resp.gid_tbl_len     = attr.gid_tbl_len;
 475         resp.port_cap_flags  = attr.port_cap_flags;
 476         resp.max_msg_sz      = attr.max_msg_sz;
 477         resp.bad_pkey_cntr   = attr.bad_pkey_cntr;
 478         resp.qkey_viol_cntr  = attr.qkey_viol_cntr;
 479         resp.pkey_tbl_len    = attr.pkey_tbl_len;
 480         resp.lid             = attr.lid;
 481         resp.sm_lid          = attr.sm_lid;
 482         resp.lmc             = attr.lmc;
 483         resp.max_vl_num      = attr.max_vl_num;
 484         resp.sm_sl           = attr.sm_sl;
 485         resp.subnet_timeout  = attr.subnet_timeout;
 486         resp.init_type_reply = attr.init_type_reply;
 487         resp.active_width    = attr.active_width;
 488         resp.active_speed    = attr.active_speed;
 489         resp.phys_state      = attr.phys_state;
 490         resp.link_layer      = rdma_port_get_link_layer(file->device->ib_dev,
 491                                                         cmd.port_num);
 492
 493         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 494                          &resp, sizeof resp))
 495                 return -EFAULT;
 496
 497         return in_len;
 498 }
 499
 500 ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
 501                            const char __user *buf,
 502                            int in_len, int out_len)
 503 {
 504         struct ib_uverbs_alloc_pd      cmd;
 505         struct ib_uverbs_alloc_pd_resp resp;
 506         struct ib_udata                udata;
 507         struct ib_uobject             *uobj;
 508         struct ib_pd                  *pd;
 509         int                            ret;
 510
 511         if (out_len < sizeof resp)
 512                 return -ENOSPC;
 513
 514         if (copy_from_user(&cmd, buf, sizeof cmd))
 515                 return -EFAULT;
 516
 517         INIT_UDATA(&udata, buf + sizeof cmd,
 518                    (unsigned long) cmd.response + sizeof resp,
 519                    in_len - sizeof cmd, out_len - sizeof resp);
 520
 521         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
 522         if (!uobj)
 523                 return -ENOMEM;
 524
 525         init_uobj(uobj, 0, file->ucontext, &pd_lock_class);
 526         down_write(&uobj->mutex);
 527
 528         pd = file->device->ib_dev->alloc_pd(file->device->ib_dev,
 529                                             file->ucontext, &udata);
 530         if (IS_ERR(pd)) {
 531                 ret = PTR_ERR(pd);
 532                 goto err;
 533         }
 534
 535         pd->device  = file->device->ib_dev;
 536         pd->uobject = uobj;
 537         atomic_set(&pd->usecnt, 0);
 538
 539         uobj->object = pd;
 540         ret = idr_add_uobj(&ib_uverbs_pd_idr, uobj);
 541         if (ret)
 542                 goto err_idr;
 543
 544         memset(&resp, 0, sizeof resp);
 545         resp.pd_handle = uobj->id;
 546
 547         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 548                          &resp, sizeof resp)) {
 549                 ret = -EFAULT;
 550                 goto err_copy;
 551         }
 552
 553         mutex_lock(&file->mutex);
 554         list_add_tail(&uobj->list, &file->ucontext->pd_list);
 555         mutex_unlock(&file->mutex);
 556
 557         uobj->live = 1;
 558
 559         up_write(&uobj->mutex);
 560
 561         return in_len;
 562
 563 err_copy:
 564         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 565
 566 err_idr:
 567         ib_dealloc_pd(pd);
 568
 569 err:
 570         put_uobj_write(uobj);
 571         return ret;
 572 }
 573
 574 ssize_t ib_uverbs_dealloc_pd(struct ib_uverbs_file *file,
 575                              const char __user *buf,
 576                              int in_len, int out_len)
 577 {
 578         struct ib_uverbs_dealloc_pd cmd;
 579         struct ib_uobject          *uobj;
 580         int                         ret;
 581
 582         if (copy_from_user(&cmd, buf, sizeof cmd))
 583                 return -EFAULT;
 584
 585         uobj = idr_write_uobj(&ib_uverbs_pd_idr, cmd.pd_handle, file->ucontext);
 586         if (!uobj)
 587                 return -EINVAL;
 588
 589         ret = ib_dealloc_pd(uobj->object);
 590         if (!ret)
 591                 uobj->live = 0;
 592
 593         put_uobj_write(uobj);
 594
 595         if (ret)
 596                 return ret;
 597
 598         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 599
 600         mutex_lock(&file->mutex);
 601         list_del(&uobj->list);
 602         mutex_unlock(&file->mutex);
 603
 604         put_uobj(uobj);
 605
 606         return in_len;
 607 }
 608
 609 struct xrcd_table_entry {
 610         struct rb_node  node;
 611         struct ib_xrcd *xrcd;
 612         struct inode   *inode;
 613 };
 614
 615 static int xrcd_table_insert(struct ib_uverbs_device *dev,
 616                             struct inode *inode,
 617                             struct ib_xrcd *xrcd)
 618 {
 619         struct xrcd_table_entry *entry, *scan;
 620         struct rb_node **p = &dev->xrcd_tree.rb_node;
 621         struct rb_node *parent = NULL;
 622
 623         entry = kmalloc(sizeof *entry, GFP_KERNEL);
 624         if (!entry)
 625                 return -ENOMEM;
 626
 627         entry->xrcd  = xrcd;
 628         entry->inode = inode;
 629
 630         while (*p) {
 631                 parent = *p;
 632                 scan = rb_entry(parent, struct xrcd_table_entry, node);
 633
 634                 if (inode < scan->inode) {
 635                         p = &(*p)->rb_left;
 636                 } else if (inode > scan->inode) {
 637                         p = &(*p)->rb_right;
 638                 } else {
 639                         kfree(entry);
 640                         return -EEXIST;
 641                 }
 642         }
 643
 644         rb_link_node(&entry->node, parent, p);
 645         rb_insert_color(&entry->node, &dev->xrcd_tree);
 646         igrab(inode);
 647         return 0;
 648 }
 649
 650 static struct xrcd_table_entry *xrcd_table_search(struct ib_uverbs_device *dev,
 651                                                   struct inode *inode)
 652 {
 653         struct xrcd_table_entry *entry;
 654         struct rb_node *p = dev->xrcd_tree.rb_node;
 655
 656         while (p) {
 657                 entry = rb_entry(p, struct xrcd_table_entry, node);
 658
 659                 if (inode < entry->inode)
 660                         p = p->rb_left;
 661                 else if (inode > entry->inode)
 662                         p = p->rb_right;
 663                 else
 664                         return entry;
 665         }
 666
 667         return NULL;
 668 }
 669
 670 static struct ib_xrcd *find_xrcd(struct ib_uverbs_device *dev, struct inode *inode)
 671 {
 672         struct xrcd_table_entry *entry;
 673
 674         entry = xrcd_table_search(dev, inode);
 675         if (!entry)
 676                 return NULL;
 677
 678         return entry->xrcd;
 679 }
 680
 681 static void xrcd_table_delete(struct ib_uverbs_device *dev,
 682                               struct inode *inode)
 683 {
 684         struct xrcd_table_entry *entry;
 685
 686         entry = xrcd_table_search(dev, inode);
 687         if (entry) {
 688                 iput(inode);
 689                 rb_erase(&entry->node, &dev->xrcd_tree);
 690                 kfree(entry);
 691         }
 692 }
 693
 694 ssize_t ib_uverbs_open_xrcd(struct ib_uverbs_file *file,
 695                             const char __user *buf, int in_len,
 696                             int out_len)
 697 {
 698         struct ib_uverbs_open_xrcd      cmd;
 699         struct ib_uverbs_open_xrcd_resp resp;
 700         struct ib_udata                 udata;
 701         struct ib_uxrcd_object         *obj;
 702         struct ib_xrcd                 *xrcd = NULL;
 703         struct fd                       f = {NULL, 0};
 704         struct inode                   *inode = NULL;
 705         int                             ret = 0;
 706         int                             new_xrcd = 0;
 707
 708         if (out_len < sizeof resp)
 709                 return -ENOSPC;
 710
 711         if (copy_from_user(&cmd, buf, sizeof cmd))
 712                 return -EFAULT;
 713
 714         INIT_UDATA(&udata, buf + sizeof cmd,
 715                    (unsigned long) cmd.response + sizeof resp,
 716                    in_len - sizeof cmd, out_len - sizeof  resp);
 717
 718         mutex_lock(&file->device->xrcd_tree_mutex);
 719
 720         if (cmd.fd != -1) {
 721                 /* search for file descriptor */
 722                 f = fdget(cmd.fd);
 723                 if (!f.file) {
 724                         ret = -EBADF;
 725                         goto err_tree_mutex_unlock;
 726                 }
 727
 728                 inode = file_inode(f.file);
 729                 xrcd = find_xrcd(file->device, inode);
 730                 if (!xrcd && !(cmd.oflags & O_CREAT)) {
 731                         /* no file descriptor. Need CREATE flag */
 732                         ret = -EAGAIN;
 733                         goto err_tree_mutex_unlock;
 734                 }
 735
 736                 if (xrcd && cmd.oflags & O_EXCL) {
 737                         ret = -EINVAL;
 738                         goto err_tree_mutex_unlock;
 739                 }
 740         }
 741
 742         obj = kmalloc(sizeof *obj, GFP_KERNEL);
 743         if (!obj) {
 744                 ret = -ENOMEM;
 745                 goto err_tree_mutex_unlock;
 746         }
 747
 748         init_uobj(&obj->uobject, 0, file->ucontext, &xrcd_lock_class);
 749
 750         down_write(&obj->uobject.mutex);
 751
 752         if (!xrcd) {
 753                 xrcd = file->device->ib_dev->alloc_xrcd(file->device->ib_dev,
 754                                                         file->ucontext, &udata);
 755                 if (IS_ERR(xrcd)) {
 756                         ret = PTR_ERR(xrcd);
 757                         goto err;
 758                 }
 759
 760                 xrcd->inode   = inode;
 761                 xrcd->device  = file->device->ib_dev;
 762                 atomic_set(&xrcd->usecnt, 0);
 763                 mutex_init(&xrcd->tgt_qp_mutex);
 764                 INIT_LIST_HEAD(&xrcd->tgt_qp_list);
 765                 new_xrcd = 1;
 766         }
 767
 768         atomic_set(&obj->refcnt, 0);
 769         obj->uobject.object = xrcd;
 770         ret = idr_add_uobj(&ib_uverbs_xrcd_idr, &obj->uobject);
 771         if (ret)
 772                 goto err_idr;
 773
 774         memset(&resp, 0, sizeof resp);
 775         resp.xrcd_handle = obj->uobject.id;
 776
 777         if (inode) {
 778                 if (new_xrcd) {
 779                         /* create new inode/xrcd table entry */
 780                         ret = xrcd_table_insert(file->device, inode, xrcd);
 781                         if (ret)
 782                                 goto err_insert_xrcd;
 783                 }
 784                 atomic_inc(&xrcd->usecnt);
 785         }
 786
 787         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 788                          &resp, sizeof resp)) {
 789                 ret = -EFAULT;
 790                 goto err_copy;
 791         }
 792
 793         if (f.file)
 794                 fdput(f);
 795
 796         mutex_lock(&file->mutex);
 797         list_add_tail(&obj->uobject.list, &file->ucontext->xrcd_list);
 798         mutex_unlock(&file->mutex);
 799
 800         obj->uobject.live = 1;
 801         up_write(&obj->uobject.mutex);
 802
 803         mutex_unlock(&file->device->xrcd_tree_mutex);
 804         return in_len;
 805
 806 err_copy:
 807         if (inode) {
 808                 if (new_xrcd)
 809                         xrcd_table_delete(file->device, inode);
 810                 atomic_dec(&xrcd->usecnt);
 811         }
 812
 813 err_insert_xrcd:
 814         idr_remove_uobj(&ib_uverbs_xrcd_idr, &obj->uobject);
 815
 816 err_idr:
 817         ib_dealloc_xrcd(xrcd);
 818
 819 err:
 820         put_uobj_write(&obj->uobject);
 821
 822 err_tree_mutex_unlock:
 823         if (f.file)
 824                 fdput(f);
 825
 826         mutex_unlock(&file->device->xrcd_tree_mutex);
 827
 828         return ret;
 829 }
 830
 831 ssize_t ib_uverbs_close_xrcd(struct ib_uverbs_file *file,
 832                              const char __user *buf, int in_len,
 833                              int out_len)
 834 {
 835         struct ib_uverbs_close_xrcd cmd;
 836         struct ib_uobject           *uobj;
 837         struct ib_xrcd              *xrcd = NULL;
 838         struct inode                *inode = NULL;
 839         struct ib_uxrcd_object      *obj;
 840         int                         live;
 841         int                         ret = 0;
 842
 843         if (copy_from_user(&cmd, buf, sizeof cmd))
 844                 return -EFAULT;
 845
 846         mutex_lock(&file->device->xrcd_tree_mutex);
 847         uobj = idr_write_uobj(&ib_uverbs_xrcd_idr, cmd.xrcd_handle, file->ucontext);
 848         if (!uobj) {
 849                 ret = -EINVAL;
 850                 goto out;
 851         }
 852
 853         xrcd  = uobj->object;
 854         inode = xrcd->inode;
 855         obj   = container_of(uobj, struct ib_uxrcd_object, uobject);
 856         if (atomic_read(&obj->refcnt)) {
 857                 put_uobj_write(uobj);
 858                 ret = -EBUSY;
 859                 goto out;
 860         }
 861
 862         if (!inode || atomic_dec_and_test(&xrcd->usecnt)) {
 863                 ret = ib_dealloc_xrcd(uobj->object);
 864                 if (!ret)
 865                         uobj->live = 0;
 866         }
 867
 868         live = uobj->live;
 869         if (inode && ret)
 870                 atomic_inc(&xrcd->usecnt);
 871
 872         put_uobj_write(uobj);
 873
 874         if (ret)
 875                 goto out;
 876
 877         if (inode && !live)
 878                 xrcd_table_delete(file->device, inode);
 879
 880         idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
 881         mutex_lock(&file->mutex);
 882         list_del(&uobj->list);
 883         mutex_unlock(&file->mutex);
 884
 885         put_uobj(uobj);
 886         ret = in_len;
 887
 888 out:
 889         mutex_unlock(&file->device->xrcd_tree_mutex);
 890         return ret;
 891 }
 892
 893 void ib_uverbs_dealloc_xrcd(struct ib_uverbs_device *dev,
 894                             struct ib_xrcd *xrcd)
 895 {
 896         struct inode *inode;
 897
 898         inode = xrcd->inode;
 899         if (inode && !atomic_dec_and_test(&xrcd->usecnt))
 900                 return;
 901
 902         ib_dealloc_xrcd(xrcd);
 903
 904         if (inode)
 905                 xrcd_table_delete(dev, inode);
 906 }
 907
 908 ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
 909                          const char __user *buf, int in_len,
 910                          int out_len)
 911 {
 912         struct ib_uverbs_reg_mr      cmd;
 913         struct ib_uverbs_reg_mr_resp resp;
 914         struct ib_udata              udata;
 915         struct ib_uobject           *uobj;
 916         struct ib_pd                *pd;
 917         struct ib_mr                *mr;
 918         int                          ret;
 919
 920         if (out_len < sizeof resp)
 921                 return -ENOSPC;
 922
 923         if (copy_from_user(&cmd, buf, sizeof cmd))
 924                 return -EFAULT;
 925
 926         INIT_UDATA(&udata, buf + sizeof cmd,
 927                    (unsigned long) cmd.response + sizeof resp,
 928                    in_len - sizeof cmd, out_len - sizeof resp);
 929
 930         if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))
 931                 return -EINVAL;
 932
 933         ret = ib_check_mr_access(cmd.access_flags);
 934         if (ret)
 935                 return ret;
 936
 937         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
 938         if (!uobj)
 939                 return -ENOMEM;
 940
 941         init_uobj(uobj, 0, file->ucontext, &mr_lock_class);
 942         down_write(&uobj->mutex);
 943
 944         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
 945         if (!pd) {
 946                 ret = -EINVAL;
 947                 goto err_free;
 948         }
 949
 950         mr = pd->device->reg_user_mr(pd, cmd.start, cmd.length, cmd.hca_va,
 951                                      cmd.access_flags, &udata);
 952         if (IS_ERR(mr)) {
 953                 ret = PTR_ERR(mr);
 954                 goto err_put;
 955         }
 956
 957         mr->device  = pd->device;
 958         mr->pd      = pd;
 959         mr->uobject = uobj;
 960         atomic_inc(&pd->usecnt);
 961         atomic_set(&mr->usecnt, 0);
 962
 963         uobj->object = mr;
 964         ret = idr_add_uobj(&ib_uverbs_mr_idr, uobj);
 965         if (ret)
 966                 goto err_unreg;
 967
 968         memset(&resp, 0, sizeof resp);
 969         resp.lkey      = mr->lkey;
 970         resp.rkey      = mr->rkey;
 971         resp.mr_handle = uobj->id;
 972
 973         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 974                          &resp, sizeof resp)) {
 975                 ret = -EFAULT;
 976                 goto err_copy;
 977         }
 978
 979         put_pd_read(pd);
 980
 981         mutex_lock(&file->mutex);
 982         list_add_tail(&uobj->list, &file->ucontext->mr_list);
 983         mutex_unlock(&file->mutex);
 984
 985         uobj->live = 1;
 986
 987         up_write(&uobj->mutex);
 988
 989         return in_len;
 990
 991 err_copy:
 992         idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 993
 994 err_unreg:
 995         ib_dereg_mr(mr);
 996
 997 err_put:
 998         put_pd_read(pd);
 999
1000 err_free:
1001         put_uobj_write(uobj);
1002         return ret;
1003 }
1004
1005 ssize_t ib_uverbs_rereg_mr(struct ib_uverbs_file *file,
1006                            const char __user *buf, int in_len,
1007                            int out_len)
1008 {
1009         struct ib_uverbs_rereg_mr      cmd;
1010         struct ib_uverbs_rereg_mr_resp resp;
1011         struct ib_udata              udata;
1012         struct ib_pd                *pd = NULL;
1013         struct ib_mr                *mr;
1014         struct ib_pd                *old_pd;
1015         int                          ret;
1016         struct ib_uobject           *uobj;
1017
1018         if (out_len < sizeof(resp))
1019                 return -ENOSPC;
1020
1021         if (copy_from_user(&cmd, buf, sizeof(cmd)))
1022                 return -EFAULT;
1023
1024         INIT_UDATA(&udata, buf + sizeof(cmd),
1025                    (unsigned long) cmd.response + sizeof(resp),
1026                    in_len - sizeof(cmd), out_len - sizeof(resp));
1027
1028         if (cmd.flags & ~IB_MR_REREG_SUPPORTED || !cmd.flags)
1029                 return -EINVAL;
1030
1031         if ((cmd.flags & IB_MR_REREG_TRANS) &&
1032             (!cmd.start || !cmd.hca_va || 0 >= cmd.length ||
1033              (cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK)))
1034                         return -EINVAL;
1035
1036         uobj = idr_write_uobj(&ib_uverbs_mr_idr, cmd.mr_handle,
1037                               file->ucontext);
1038
1039         if (!uobj)
1040                 return -EINVAL;
1041
1042         mr = uobj->object;
1043
1044         if (cmd.flags & IB_MR_REREG_ACCESS) {
1045                 ret = ib_check_mr_access(cmd.access_flags);
1046                 if (ret)
1047                         goto put_uobjs;
1048         }
1049
1050         if (cmd.flags & IB_MR_REREG_PD) {
1051                 pd = idr_read_pd(cmd.pd_handle, file->ucontext);
1052                 if (!pd) {
1053                         ret = -EINVAL;
1054                         goto put_uobjs;
1055                 }
1056         }
1057
1058         if (atomic_read(&mr->usecnt)) {
1059                 ret = -EBUSY;
1060                 goto put_uobj_pd;
1061         }
1062
1063         old_pd = mr->pd;
1064         ret = mr->device->rereg_user_mr(mr, cmd.flags, cmd.start,
1065                                         cmd.length, cmd.hca_va,
1066                                         cmd.access_flags, pd, &udata);
1067         if (!ret) {
1068                 if (cmd.flags & IB_MR_REREG_PD) {
1069                         atomic_inc(&pd->usecnt);
1070                         mr->pd = pd;
1071                         atomic_dec(&old_pd->usecnt);
1072                 }
1073         } else {
1074                 goto put_uobj_pd;
1075         }
1076
1077         memset(&resp, 0, sizeof(resp));
1078         resp.lkey      = mr->lkey;
1079         resp.rkey      = mr->rkey;
1080
1081         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1082                          &resp, sizeof(resp)))
1083                 ret = -EFAULT;
1084         else
1085                 ret = in_len;
1086
1087 put_uobj_pd:
1088         if (cmd.flags & IB_MR_REREG_PD)
1089                 put_pd_read(pd);
1090
1091 put_uobjs:
1092
1093         put_uobj_write(mr->uobject);
1094
1095         return ret;
1096 }
1097
1098 ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
1099                            const char __user *buf, int in_len,
1100                            int out_len)
1101 {
1102         struct ib_uverbs_dereg_mr cmd;
1103         struct ib_mr             *mr;
1104         struct ib_uobject        *uobj;
1105         int                       ret = -EINVAL;
1106
1107         if (copy_from_user(&cmd, buf, sizeof cmd))
1108                 return -EFAULT;
1109
1110         uobj = idr_write_uobj(&ib_uverbs_mr_idr, cmd.mr_handle, file->ucontext);
1111         if (!uobj)
1112                 return -EINVAL;
1113
1114         mr = uobj->object;
1115
1116         ret = ib_dereg_mr(mr);
1117         if (!ret)
1118                 uobj->live = 0;
1119
1120         put_uobj_write(uobj);
1121
1122         if (ret)
1123                 return ret;
1124
1125         idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
1126
1127         mutex_lock(&file->mutex);
1128         list_del(&uobj->list);
1129         mutex_unlock(&file->mutex);
1130
1131         put_uobj(uobj);
1132
1133         return in_len;
1134 }
1135
1136 ssize_t ib_uverbs_alloc_mw(struct ib_uverbs_file *file,
1137                          const char __user *buf, int in_len,
1138                          int out_len)
1139 {
1140         struct ib_uverbs_alloc_mw      cmd;
1141         struct ib_uverbs_alloc_mw_resp resp;
1142         struct ib_uobject             *uobj;
1143         struct ib_pd                  *pd;
1144         struct ib_mw                  *mw;
1145         int                            ret;
1146
1147         if (out_len < sizeof(resp))
1148                 return -ENOSPC;
1149
1150         if (copy_from_user(&cmd, buf, sizeof(cmd)))
1151                 return -EFAULT;
1152
1153         uobj = kmalloc(sizeof(*uobj), GFP_KERNEL);
1154         if (!uobj)
1155                 return -ENOMEM;
1156
1157         init_uobj(uobj, 0, file->ucontext, &mw_lock_class);
1158         down_write(&uobj->mutex);
1159
1160         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
1161         if (!pd) {
1162                 ret = -EINVAL;
1163                 goto err_free;
1164         }
1165
1166         mw = pd->device->alloc_mw(pd, cmd.mw_type);
1167         if (IS_ERR(mw)) {
1168                 ret = PTR_ERR(mw);
1169                 goto err_put;
1170         }
1171
1172         mw->device  = pd->device;
1173         mw->pd      = pd;
1174         mw->uobject = uobj;
1175         atomic_inc(&pd->usecnt);
1176
1177         uobj->object = mw;
1178         ret = idr_add_uobj(&ib_uverbs_mw_idr, uobj);
1179         if (ret)
1180                 goto err_unalloc;
1181
1182         memset(&resp, 0, sizeof(resp));
1183         resp.rkey      = mw->rkey;
1184         resp.mw_handle = uobj->id;
1185
1186         if (copy_to_user((void __user *)(unsigned long)cmd.response,
1187                          &resp, sizeof(resp))) {
1188                 ret = -EFAULT;
1189                 goto err_copy;
1190         }
1191
1192         put_pd_read(pd);
1193
1194         mutex_lock(&file->mutex);
1195         list_add_tail(&uobj->list, &file->ucontext->mw_list);
1196         mutex_unlock(&file->mutex);
1197
1198         uobj->live = 1;
1199
1200         up_write(&uobj->mutex);
1201
1202         return in_len;
1203
1204 err_copy:
1205         idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
1206
1207 err_unalloc:
1208         ib_dealloc_mw(mw);
1209
1210 err_put:
1211         put_pd_read(pd);
1212
1213 err_free:
1214         put_uobj_write(uobj);
1215         return ret;
1216 }
1217
1218 ssize_t ib_uverbs_dealloc_mw(struct ib_uverbs_file *file,
1219                            const char __user *buf, int in_len,
1220                            int out_len)
1221 {
1222         struct ib_uverbs_dealloc_mw cmd;
1223         struct ib_mw               *mw;
1224         struct ib_uobject          *uobj;
1225         int                         ret = -EINVAL;
1226
1227         if (copy_from_user(&cmd, buf, sizeof(cmd)))
1228                 return -EFAULT;
1229
1230         uobj = idr_write_uobj(&ib_uverbs_mw_idr, cmd.mw_handle, file->ucontext);
1231         if (!uobj)
1232                 return -EINVAL;
1233
1234         mw = uobj->object;
1235
1236         ret = ib_dealloc_mw(mw);
1237         if (!ret)
1238                 uobj->live = 0;
1239
1240         put_uobj_write(uobj);
1241
1242         if (ret)
1243                 return ret;
1244
1245         idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
1246
1247         mutex_lock(&file->mutex);
1248         list_del(&uobj->list);
1249         mutex_unlock(&file->mutex);
1250
1251         put_uobj(uobj);
1252
1253         return in_len;
1254 }
1255
1256 ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
1257                                       const char __user *buf, int in_len,
1258                                       int out_len)
1259 {
1260         struct ib_uverbs_create_comp_channel       cmd;
1261         struct ib_uverbs_create_comp_channel_resp  resp;
1262         struct file                               *filp;
1263         int ret;
1264
1265         if (out_len < sizeof resp)
1266                 return -ENOSPC;
1267
1268         if (copy_from_user(&cmd, buf, sizeof cmd))
1269                 return -EFAULT;
1270
1271         ret = get_unused_fd_flags(O_CLOEXEC);
1272         if (ret < 0)
1273                 return ret;
1274         resp.fd = ret;
1275
1276         filp = ib_uverbs_alloc_event_file(file, 0);
1277         if (IS_ERR(filp)) {
1278                 put_unused_fd(resp.fd);
1279                 return PTR_ERR(filp);
1280         }
1281
1282         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1283                          &resp, sizeof resp)) {
1284                 put_unused_fd(resp.fd);
1285                 fput(filp);
1286                 return -EFAULT;
1287         }
1288
1289         fd_install(resp.fd, filp);
1290         return in_len;
1291 }
1292
1293 ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
1294                             const char __user *buf, int in_len,
1295                             int out_len)
1296 {
1297         struct ib_uverbs_create_cq      cmd;
1298         struct ib_uverbs_create_cq_resp resp;
1299         struct ib_udata                 udata;
1300         struct ib_ucq_object           *obj;
1301         struct ib_uverbs_event_file    *ev_file = NULL;
1302         struct ib_cq                   *cq;
1303         int                             ret;
1304
1305         if (out_len < sizeof resp)
1306                 return -ENOSPC;
1307
1308         if (copy_from_user(&cmd, buf, sizeof cmd))
1309                 return -EFAULT;
1310
1311         INIT_UDATA(&udata, buf + sizeof cmd,
1312                    (unsigned long) cmd.response + sizeof resp,
1313                    in_len - sizeof cmd, out_len - sizeof resp);
1314
1315         if (cmd.comp_vector >= file->device->num_comp_vectors)
1316                 return -EINVAL;
1317
1318         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1319         if (!obj)
1320                 return -ENOMEM;
1321
1322         init_uobj(&obj->uobject, cmd.user_handle, file->ucontext, &cq_lock_class);
1323         down_write(&obj->uobject.mutex);
1324
1325         if (cmd.comp_channel >= 0) {
1326                 ev_file = ib_uverbs_lookup_comp_file(cmd.comp_channel);
1327                 if (!ev_file) {
1328                         ret = -EINVAL;
1329                         goto err;
1330                 }
1331         }
1332
1333         obj->uverbs_file           = file;
1334         obj->comp_events_reported  = 0;
1335         obj->async_events_reported = 0;
1336         INIT_LIST_HEAD(&obj->comp_list);
1337         INIT_LIST_HEAD(&obj->async_list);
1338
1339         cq = file->device->ib_dev->create_cq(file->device->ib_dev, cmd.cqe,
1340                                              cmd.comp_vector,
1341                                              file->ucontext, &udata);
1342         if (IS_ERR(cq)) {
1343                 ret = PTR_ERR(cq);
1344                 goto err_file;
1345         }
1346
1347         cq->device        = file->device->ib_dev;
1348         cq->uobject       = &obj->uobject;
1349         cq->comp_handler  = ib_uverbs_comp_handler;
1350         cq->event_handler = ib_uverbs_cq_event_handler;
1351         cq->cq_context    = ev_file;
1352         atomic_set(&cq->usecnt, 0);
1353
1354         obj->uobject.object = cq;
1355         ret = idr_add_uobj(&ib_uverbs_cq_idr, &obj->uobject);
1356         if (ret)
1357                 goto err_free;
1358
1359         memset(&resp, 0, sizeof resp);
1360         resp.cq_handle = obj->uobject.id;
1361         resp.cqe       = cq->cqe;
1362
1363         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1364                          &resp, sizeof resp)) {
1365                 ret = -EFAULT;
1366                 goto err_copy;
1367         }
1368
1369         mutex_lock(&file->mutex);
1370         list_add_tail(&obj->uobject.list, &file->ucontext->cq_list);
1371         mutex_unlock(&file->mutex);
1372
1373         obj->uobject.live = 1;
1374
1375         up_write(&obj->uobject.mutex);
1376
1377         return in_len;
1378
1379 err_copy:
1380         idr_remove_uobj(&ib_uverbs_cq_idr, &obj->uobject);
1381
1382 err_free:
1383         ib_destroy_cq(cq);
1384
1385 err_file:
1386         if (ev_file)
1387                 ib_uverbs_release_ucq(file, ev_file, obj);
1388
1389 err:
1390         put_uobj_write(&obj->uobject);
1391         return ret;
1392 }
1393
1394 ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
1395                             const char __user *buf, int in_len,
1396                             int out_len)
1397 {
1398         struct ib_uverbs_resize_cq      cmd;
1399         struct ib_uverbs_resize_cq_resp resp;
1400         struct ib_udata                 udata;
1401         struct ib_cq                    *cq;
1402         int                             ret = -EINVAL;
1403
1404         if (copy_from_user(&cmd, buf, sizeof cmd))
1405                 return -EFAULT;
1406
1407         INIT_UDATA(&udata, buf + sizeof cmd,
1408                    (unsigned long) cmd.response + sizeof resp,
1409                    in_len - sizeof cmd, out_len - sizeof resp);
1410
1411         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
1412         if (!cq)
1413                 return -EINVAL;
1414
1415         ret = cq->device->resize_cq(cq, cmd.cqe, &udata);
1416         if (ret)
1417                 goto out;
1418
1419         resp.cqe = cq->cqe;
1420
1421         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1422                          &resp, sizeof resp.cqe))
1423                 ret = -EFAULT;
1424
1425 out:
1426         put_cq_read(cq);
1427
1428         return ret ? ret : in_len;
1429 }
1430
1431 static int copy_wc_to_user(void __user *dest, struct ib_wc *wc)
1432 {
1433         struct ib_uverbs_wc tmp;
1434
1435         tmp.wr_id               = wc->wr_id;
1436         tmp.status              = wc->status;
1437         tmp.opcode              = wc->opcode;
1438         tmp.vendor_err          = wc->vendor_err;
1439         tmp.byte_len            = wc->byte_len;
1440         tmp.ex.imm_data         = (__u32 __force) wc->ex.imm_data;
1441         tmp.qp_num              = wc->qp->qp_num;
1442         tmp.src_qp              = wc->src_qp;
1443         tmp.wc_flags            = wc->wc_flags;
1444         tmp.pkey_index          = wc->pkey_index;
1445         tmp.slid                = wc->slid;
1446         tmp.sl                  = wc->sl;
1447         tmp.dlid_path_bits      = wc->dlid_path_bits;
1448         tmp.port_num            = wc->port_num;
1449         tmp.reserved            = 0;
1450
1451         if (copy_to_user(dest, &tmp, sizeof tmp))
1452                 return -EFAULT;
1453
1454         return 0;
1455 }
1456
1457 ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
1458                           const char __user *buf, int in_len,
1459                           int out_len)
1460 {
1461         struct ib_uverbs_poll_cq       cmd;
1462         struct ib_uverbs_poll_cq_resp  resp;
1463         u8 __user                     *header_ptr;
1464         u8 __user                     *data_ptr;
1465         struct ib_cq                  *cq;
1466         struct ib_wc                   wc;
1467         int                            ret;
1468
1469         if (copy_from_user(&cmd, buf, sizeof cmd))
1470                 return -EFAULT;
1471
1472         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
1473         if (!cq)
1474                 return -EINVAL;
1475
1476         /* we copy a struct ib_uverbs_poll_cq_resp to user space */
1477         header_ptr = (void __user *)(unsigned long) cmd.response;
1478         data_ptr = header_ptr + sizeof resp;
1479
1480         memset(&resp, 0, sizeof resp);
1481         while (resp.count < cmd.ne) {
1482                 ret = ib_poll_cq(cq, 1, &wc);
1483                 if (ret < 0)
1484                         goto out_put;
1485                 if (!ret)
1486                         break;
1487
1488                 ret = copy_wc_to_user(data_ptr, &wc);
1489                 if (ret)
1490                         goto out_put;
1491
1492                 data_ptr += sizeof(struct ib_uverbs_wc);
1493                 ++resp.count;
1494         }
1495
1496         if (copy_to_user(header_ptr, &resp, sizeof resp)) {
1497                 ret = -EFAULT;
1498                 goto out_put;
1499         }
1500
1501         ret = in_len;
1502
1503 out_put:
1504         put_cq_read(cq);
1505         return ret;
1506 }
1507
1508 ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file,
1509                                 const char __user *buf, int in_len,
1510                                 int out_len)
1511 {
1512         struct ib_uverbs_req_notify_cq cmd;
1513         struct ib_cq                  *cq;
1514
1515         if (copy_from_user(&cmd, buf, sizeof cmd))
1516                 return -EFAULT;
1517
1518         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
1519         if (!cq)
1520                 return -EINVAL;
1521
1522         ib_req_notify_cq(cq, cmd.solicited_only ?
1523                          IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
1524
1525         put_cq_read(cq);
1526
1527         return in_len;
1528 }
1529
1530 ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
1531                              const char __user *buf, int in_len,
1532                              int out_len)
1533 {
1534         struct ib_uverbs_destroy_cq      cmd;
1535         struct ib_uverbs_destroy_cq_resp resp;
1536         struct ib_uobject               *uobj;
1537         struct ib_cq                    *cq;
1538         struct ib_ucq_object            *obj;
1539         struct ib_uverbs_event_file     *ev_file;
1540         int                              ret = -EINVAL;
1541
1542         if (copy_from_user(&cmd, buf, sizeof cmd))
1543                 return -EFAULT;
1544
1545         uobj = idr_write_uobj(&ib_uverbs_cq_idr, cmd.cq_handle, file->ucontext);
1546         if (!uobj)
1547                 return -EINVAL;
1548         cq      = uobj->object;
1549         ev_file = cq->cq_context;
1550         obj     = container_of(cq->uobject, struct ib_ucq_object, uobject);
1551
1552         ret = ib_destroy_cq(cq);
1553         if (!ret)
1554                 uobj->live = 0;
1555
1556         put_uobj_write(uobj);
1557
1558         if (ret)
1559                 return ret;
1560
1561         idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
1562
1563         mutex_lock(&file->mutex);
1564         list_del(&uobj->list);
1565         mutex_unlock(&file->mutex);
1566
1567         ib_uverbs_release_ucq(file, ev_file, obj);
1568
1569         memset(&resp, 0, sizeof resp);
1570         resp.comp_events_reported  = obj->comp_events_reported;
1571         resp.async_events_reported = obj->async_events_reported;
1572
1573         put_uobj(uobj);
1574
1575         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1576                          &resp, sizeof resp))
1577                 return -EFAULT;
1578
1579         return in_len;
1580 }
1581
1582 ssize_t ib_uverbs_create_qp(struct ib_uverbs_file *file,
1583                             const char __user *buf, int in_len,
1584                             int out_len)
1585 {
1586         struct ib_uverbs_create_qp      cmd;
1587         struct ib_uverbs_create_qp_resp resp;
1588         struct ib_udata                 udata;
1589         struct ib_uqp_object           *obj;
1590         struct ib_device               *device;
1591         struct ib_pd                   *pd = NULL;
1592         struct ib_xrcd                 *xrcd = NULL;
1593         struct ib_uobject              *uninitialized_var(xrcd_uobj);
1594         struct ib_cq                   *scq = NULL, *rcq = NULL;
1595         struct ib_srq                  *srq = NULL;
1596         struct ib_qp                   *qp;
1597         struct ib_qp_init_attr          attr;
1598         int ret;
1599
1600         if (out_len < sizeof resp)
1601                 return -ENOSPC;
1602
1603         if (copy_from_user(&cmd, buf, sizeof cmd))
1604                 return -EFAULT;
1605
1606         if (cmd.qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
1607                 return -EPERM;
1608
1609         INIT_UDATA(&udata, buf + sizeof cmd,
1610                    (unsigned long) cmd.response + sizeof resp,
1611                    in_len - sizeof cmd, out_len - sizeof resp);
1612
1613         obj = kzalloc(sizeof *obj, GFP_KERNEL);
1614         if (!obj)
1615                 return -ENOMEM;
1616
1617         init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_class);
1618         down_write(&obj->uevent.uobject.mutex);
1619
1620         if (cmd.qp_type == IB_QPT_XRC_TGT) {
1621                 xrcd = idr_read_xrcd(cmd.pd_handle, file->ucontext, &xrcd_uobj);
1622                 if (!xrcd) {
1623                         ret = -EINVAL;
1624                         goto err_put;
1625                 }
1626                 device = xrcd->device;
1627         } else {
1628                 if (cmd.qp_type == IB_QPT_XRC_INI) {
1629                         cmd.max_recv_wr = cmd.max_recv_sge = 0;
1630                 } else {
1631                         if (cmd.is_srq) {
1632                                 srq = idr_read_srq(cmd.srq_handle, file->ucontext);
1633                                 if (!srq || srq->srq_type != IB_SRQT_BASIC) {
1634                                         ret = -EINVAL;
1635                                         goto err_put;
1636                                 }
1637                         }
1638
1639                         if (cmd.recv_cq_handle != cmd.send_cq_handle) {
1640                                 rcq = idr_read_cq(cmd.recv_cq_handle, file->ucontext, 0);
1641                                 if (!rcq) {
1642                                         ret = -EINVAL;
1643                                         goto err_put;
1644                                 }
1645                         }
1646                 }
1647
1648                 scq = idr_read_cq(cmd.send_cq_handle, file->ucontext, !!rcq);
1649                 rcq = rcq ?: scq;
1650                 pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
1651                 if (!pd || !scq) {
1652                         ret = -EINVAL;
1653                         goto err_put;
1654                 }
1655
1656                 device = pd->device;
1657         }
1658
1659         attr.event_handler = ib_uverbs_qp_event_handler;
1660         attr.qp_context    = file;
1661         attr.send_cq       = scq;
1662         attr.recv_cq       = rcq;
1663         attr.srq           = srq;
1664         attr.xrcd          = xrcd;
1665         attr.sq_sig_type   = cmd.sq_sig_all ? IB_SIGNAL_ALL_WR : IB_SIGNAL_REQ_WR;
1666         attr.qp_type       = cmd.qp_type;
1667         attr.create_flags  = 0;
1668
1669         attr.cap.max_send_wr     = cmd.max_send_wr;
1670         attr.cap.max_recv_wr     = cmd.max_recv_wr;
1671         attr.cap.max_send_sge    = cmd.max_send_sge;
1672         attr.cap.max_recv_sge    = cmd.max_recv_sge;
1673         attr.cap.max_inline_data = cmd.max_inline_data;
1674
1675         obj->uevent.events_reported     = 0;
1676         INIT_LIST_HEAD(&obj->uevent.event_list);
1677         INIT_LIST_HEAD(&obj->mcast_list);
1678
1679         if (cmd.qp_type == IB_QPT_XRC_TGT)
1680                 qp = ib_create_qp(pd, &attr);
1681         else
1682                 qp = device->create_qp(pd, &attr, &udata);
1683
1684         if (IS_ERR(qp)) {
1685                 ret = PTR_ERR(qp);
1686                 goto err_put;
1687         }
1688
1689         if (cmd.qp_type != IB_QPT_XRC_TGT) {
1690                 qp->real_qp       = qp;
1691                 qp->device        = device;
1692                 qp->pd            = pd;
1693                 qp->send_cq       = attr.send_cq;
1694                 qp->recv_cq       = attr.recv_cq;
1695                 qp->srq           = attr.srq;
1696                 qp->event_handler = attr.event_handler;
1697                 qp->qp_context    = attr.qp_context;
1698                 qp->qp_type       = attr.qp_type;
1699                 atomic_set(&qp->usecnt, 0);
1700                 atomic_inc(&pd->usecnt);
1701                 atomic_inc(&attr.send_cq->usecnt);
1702                 if (attr.recv_cq)
1703                         atomic_inc(&attr.recv_cq->usecnt);
1704                 if (attr.srq)
1705                         atomic_inc(&attr.srq->usecnt);
1706         }
1707         qp->uobject = &obj->uevent.uobject;
1708
1709         obj->uevent.uobject.object = qp;
1710         ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1711         if (ret)
1712                 goto err_destroy;
1713
1714         memset(&resp, 0, sizeof resp);
1715         resp.qpn             = qp->qp_num;
1716         resp.qp_handle       = obj->uevent.uobject.id;
1717         resp.max_recv_sge    = attr.cap.max_recv_sge;
1718         resp.max_send_sge    = attr.cap.max_send_sge;
1719         resp.max_recv_wr     = attr.cap.max_recv_wr;
1720         resp.max_send_wr     = attr.cap.max_send_wr;
1721         resp.max_inline_data = attr.cap.max_inline_data;
1722
1723         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1724                          &resp, sizeof resp)) {
1725                 ret = -EFAULT;
1726                 goto err_copy;
1727         }
1728
1729         if (xrcd) {
1730                 obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object,
1731                                           uobject);
1732                 atomic_inc(&obj->uxrcd->refcnt);
1733                 put_xrcd_read(xrcd_uobj);
1734         }
1735
1736         if (pd)
1737                 put_pd_read(pd);
1738         if (scq)
1739                 put_cq_read(scq);
1740         if (rcq && rcq != scq)
1741                 put_cq_read(rcq);
1742         if (srq)
1743                 put_srq_read(srq);
1744
1745         mutex_lock(&file->mutex);
1746         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1747         mutex_unlock(&file->mutex);
1748
1749         obj->uevent.uobject.live = 1;
1750
1751         up_write(&obj->uevent.uobject.mutex);
1752
1753         return in_len;
1754
1755 err_copy:
1756         idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1757
1758 err_destroy:
1759         ib_destroy_qp(qp);
1760
1761 err_put:
1762         if (xrcd)
1763                 put_xrcd_read(xrcd_uobj);
1764         if (pd)
1765                 put_pd_read(pd);
1766         if (scq)
1767                 put_cq_read(scq);
1768         if (rcq && rcq != scq)
1769                 put_cq_read(rcq);
1770         if (srq)
1771                 put_srq_read(srq);
1772
1773         put_uobj_write(&obj->uevent.uobject);
1774         return ret;
1775 }
1776
1777 ssize_t ib_uverbs_open_qp(struct ib_uverbs_file *file,
1778                           const char __user *buf, int in_len, int out_len)
1779 {
1780         struct ib_uverbs_open_qp        cmd;
1781         struct ib_uverbs_create_qp_resp resp;
1782         struct ib_udata                 udata;
1783         struct ib_uqp_object           *obj;
1784         struct ib_xrcd                 *xrcd;
1785         struct ib_uobject              *uninitialized_var(xrcd_uobj);
1786         struct ib_qp                   *qp;
1787         struct ib_qp_open_attr          attr;
1788         int ret;
1789
1790         if (out_len < sizeof resp)
1791                 return -ENOSPC;
1792
1793         if (copy_from_user(&cmd, buf, sizeof cmd))
1794                 return -EFAULT;
1795
1796         INIT_UDATA(&udata, buf + sizeof cmd,
1797                    (unsigned long) cmd.response + sizeof resp,
1798                    in_len - sizeof cmd, out_len - sizeof resp);
1799
1800         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1801         if (!obj)
1802                 return -ENOMEM;
1803
1804         init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_class);
1805         down_write(&obj->uevent.uobject.mutex);
1806
1807         xrcd = idr_read_xrcd(cmd.pd_handle, file->ucontext, &xrcd_uobj);
1808         if (!xrcd) {
1809                 ret = -EINVAL;
1810                 goto err_put;
1811         }
1812
1813         attr.event_handler = ib_uverbs_qp_event_handler;
1814         attr.qp_context    = file;
1815         attr.qp_num        = cmd.qpn;
1816         attr.qp_type       = cmd.qp_type;
1817
1818         obj->uevent.events_reported = 0;
1819         INIT_LIST_HEAD(&obj->uevent.event_list);
1820         INIT_LIST_HEAD(&obj->mcast_list);
1821
1822         qp = ib_open_qp(xrcd, &attr);
1823         if (IS_ERR(qp)) {
1824                 ret = PTR_ERR(qp);
1825                 goto err_put;
1826         }
1827
1828         qp->uobject = &obj->uevent.uobject;
1829
1830         obj->uevent.uobject.object = qp;
1831         ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1832         if (ret)
1833                 goto err_destroy;
1834
1835         memset(&resp, 0, sizeof resp);
1836         resp.qpn       = qp->qp_num;
1837         resp.qp_handle = obj->uevent.uobject.id;
1838
1839         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1840                          &resp, sizeof resp)) {
1841                 ret = -EFAULT;
1842                 goto err_remove;
1843         }
1844
1845         obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, uobject);
1846         atomic_inc(&obj->uxrcd->refcnt);
1847         put_xrcd_read(xrcd_uobj);
1848
1849         mutex_lock(&file->mutex);
1850         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1851         mutex_unlock(&file->mutex);
1852
1853         obj->uevent.uobject.live = 1;
1854
1855         up_write(&obj->uevent.uobject.mutex);
1856
1857         return in_len;
1858
1859 err_remove:
1860         idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1861
1862 err_destroy:
1863         ib_destroy_qp(qp);
1864
1865 err_put:
1866         put_xrcd_read(xrcd_uobj);
1867         put_uobj_write(&obj->uevent.uobject);
1868         return ret;
1869 }
1870
1871 ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
1872                            const char __user *buf, int in_len,
1873                            int out_len)
1874 {
1875         struct ib_uverbs_query_qp      cmd;
1876         struct ib_uverbs_query_qp_resp resp;
1877         struct ib_qp                   *qp;
1878         struct ib_qp_attr              *attr;
1879         struct ib_qp_init_attr         *init_attr;
1880         int                            ret;
1881
1882         if (copy_from_user(&cmd, buf, sizeof cmd))
1883                 return -EFAULT;
1884
1885         attr      = kmalloc(sizeof *attr, GFP_KERNEL);
1886         init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
1887         if (!attr || !init_attr) {
1888                 ret = -ENOMEM;
1889                 goto out;
1890         }
1891
1892         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1893         if (!qp) {
1894                 ret = -EINVAL;
1895                 goto out;
1896         }
1897
1898         ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
1899
1900         put_qp_read(qp);
1901
1902         if (ret)
1903                 goto out;
1904
1905         memset(&resp, 0, sizeof resp);
1906
1907         resp.qp_state               = attr->qp_state;
1908         resp.cur_qp_state           = attr->cur_qp_state;
1909         resp.path_mtu               = attr->path_mtu;
1910         resp.path_mig_state         = attr->path_mig_state;
1911         resp.qkey                   = attr->qkey;
1912         resp.rq_psn                 = attr->rq_psn;
1913         resp.sq_psn                 = attr->sq_psn;
1914         resp.dest_qp_num            = attr->dest_qp_num;
1915         resp.qp_access_flags        = attr->qp_access_flags;
1916         resp.pkey_index             = attr->pkey_index;
1917         resp.alt_pkey_index         = attr->alt_pkey_index;
1918         resp.sq_draining            = attr->sq_draining;
1919         resp.max_rd_atomic          = attr->max_rd_atomic;
1920         resp.max_dest_rd_atomic     = attr->max_dest_rd_atomic;
1921         resp.min_rnr_timer          = attr->min_rnr_timer;
1922         resp.port_num               = attr->port_num;
1923         resp.timeout                = attr->timeout;
1924         resp.retry_cnt              = attr->retry_cnt;
1925         resp.rnr_retry              = attr->rnr_retry;
1926         resp.alt_port_num           = attr->alt_port_num;
1927         resp.alt_timeout            = attr->alt_timeout;
1928
1929         memcpy(resp.dest.dgid, attr->ah_attr.grh.dgid.raw, 16);
1930         resp.dest.flow_label        = attr->ah_attr.grh.flow_label;
1931         resp.dest.sgid_index        = attr->ah_attr.grh.sgid_index;
1932         resp.dest.hop_limit         = attr->ah_attr.grh.hop_limit;
1933         resp.dest.traffic_class     = attr->ah_attr.grh.traffic_class;
1934         resp.dest.dlid              = attr->ah_attr.dlid;
1935         resp.dest.sl                = attr->ah_attr.sl;
1936         resp.dest.src_path_bits     = attr->ah_attr.src_path_bits;
1937         resp.dest.static_rate       = attr->ah_attr.static_rate;
1938         resp.dest.is_global         = !!(attr->ah_attr.ah_flags & IB_AH_GRH);
1939         resp.dest.port_num          = attr->ah_attr.port_num;
1940
1941         memcpy(resp.alt_dest.dgid, attr->alt_ah_attr.grh.dgid.raw, 16);
1942         resp.alt_dest.flow_label    = attr->alt_ah_attr.grh.flow_label;
1943         resp.alt_dest.sgid_index    = attr->alt_ah_attr.grh.sgid_index;
1944         resp.alt_dest.hop_limit     = attr->alt_ah_attr.grh.hop_limit;
1945         resp.alt_dest.traffic_class = attr->alt_ah_attr.grh.traffic_class;
1946         resp.alt_dest.dlid          = attr->alt_ah_attr.dlid;
1947         resp.alt_dest.sl            = attr->alt_ah_attr.sl;
1948         resp.alt_dest.src_path_bits = attr->alt_ah_attr.src_path_bits;
1949         resp.alt_dest.static_rate   = attr->alt_ah_attr.static_rate;
1950         resp.alt_dest.is_global     = !!(attr->alt_ah_attr.ah_flags & IB_AH_GRH);
1951         resp.alt_dest.port_num      = attr->alt_ah_attr.port_num;
1952
1953         resp.max_send_wr            = init_attr->cap.max_send_wr;
1954         resp.max_recv_wr            = init_attr->cap.max_recv_wr;
1955         resp.max_send_sge           = init_attr->cap.max_send_sge;
1956         resp.max_recv_sge           = init_attr->cap.max_recv_sge;
1957         resp.max_inline_data        = init_attr->cap.max_inline_data;
1958         resp.sq_sig_all             = init_attr->sq_sig_type == IB_SIGNAL_ALL_WR;
1959
1960         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1961                          &resp, sizeof resp))
1962                 ret = -EFAULT;
1963
1964 out:
1965         kfree(attr);
1966         kfree(init_attr);
1967
1968         return ret ? ret : in_len;
1969 }
1970
1971 /* Remove ignored fields set in the attribute mask */
1972 static int modify_qp_mask(enum ib_qp_type qp_type, int mask)
1973 {
1974         switch (qp_type) {
1975         case IB_QPT_XRC_INI:
1976                 return mask & ~(IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER);
1977         case IB_QPT_XRC_TGT:
1978                 return mask & ~(IB_QP_MAX_QP_RD_ATOMIC | IB_QP_RETRY_CNT |
1979                                 IB_QP_RNR_RETRY);
1980         default:
1981                 return mask;
1982         }
1983 }
1984
1985 ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file,
1986                             const char __user *buf, int in_len,
1987                             int out_len)
1988 {
1989         struct ib_uverbs_modify_qp cmd;
1990         struct ib_udata            udata;
1991         struct ib_qp              *qp;
1992         struct ib_qp_attr         *attr;
1993         int                        ret;
1994
1995         if (copy_from_user(&cmd, buf, sizeof cmd))
1996                 return -EFAULT;
1997
1998         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
1999                    out_len);
2000
2001         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2002         if (!attr)
2003                 return -ENOMEM;
2004
2005         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
2006         if (!qp) {
2007                 ret = -EINVAL;
2008                 goto out;
2009         }
2010
2011         attr->qp_state            = cmd.qp_state;
2012         attr->cur_qp_state        = cmd.cur_qp_state;
2013         attr->path_mtu            = cmd.path_mtu;
2014         attr->path_mig_state      = cmd.path_mig_state;
2015         attr->qkey                = cmd.qkey;
2016         attr->rq_psn              = cmd.rq_psn;
2017         attr->sq_psn              = cmd.sq_psn;
2018         attr->dest_qp_num         = cmd.dest_qp_num;
2019         attr->qp_access_flags     = cmd.qp_access_flags;
2020         attr->pkey_index          = cmd.pkey_index;
2021         attr->alt_pkey_index      = cmd.alt_pkey_index;
2022         attr->en_sqd_async_notify = cmd.en_sqd_async_notify;
2023         attr->max_rd_atomic       = cmd.max_rd_atomic;
2024         attr->max_dest_rd_atomic  = cmd.max_dest_rd_atomic;
2025         attr->min_rnr_timer       = cmd.min_rnr_timer;
2026         attr->port_num            = cmd.port_num;
2027         attr->timeout             = cmd.timeout;
2028         attr->retry_cnt           = cmd.retry_cnt;
2029         attr->rnr_retry           = cmd.rnr_retry;
2030         attr->alt_port_num        = cmd.alt_port_num;
2031         attr->alt_timeout         = cmd.alt_timeout;
2032
2033         memcpy(attr->ah_attr.grh.dgid.raw, cmd.dest.dgid, 16);
2034         attr->ah_attr.grh.flow_label        = cmd.dest.flow_label;
2035         attr->ah_attr.grh.sgid_index        = cmd.dest.sgid_index;
2036         attr->ah_attr.grh.hop_limit         = cmd.dest.hop_limit;
2037         attr->ah_attr.grh.traffic_class     = cmd.dest.traffic_class;
2038         attr->ah_attr.dlid                  = cmd.dest.dlid;
2039         attr->ah_attr.sl                    = cmd.dest.sl;
2040         attr->ah_attr.src_path_bits         = cmd.dest.src_path_bits;
2041         attr->ah_attr.static_rate           = cmd.dest.static_rate;
2042         attr->ah_attr.ah_flags              = cmd.dest.is_global ? IB_AH_GRH : 0;
2043         attr->ah_attr.port_num              = cmd.dest.port_num;
2044
2045         memcpy(attr->alt_ah_attr.grh.dgid.raw, cmd.alt_dest.dgid, 16);
2046         attr->alt_ah_attr.grh.flow_label    = cmd.alt_dest.flow_label;
2047         attr->alt_ah_attr.grh.sgid_index    = cmd.alt_dest.sgid_index;
2048         attr->alt_ah_attr.grh.hop_limit     = cmd.alt_dest.hop_limit;
2049         attr->alt_ah_attr.grh.traffic_class = cmd.alt_dest.traffic_class;
2050         attr->alt_ah_attr.dlid              = cmd.alt_dest.dlid;
2051         attr->alt_ah_attr.sl                = cmd.alt_dest.sl;
2052         attr->alt_ah_attr.src_path_bits     = cmd.alt_dest.src_path_bits;
2053         attr->alt_ah_attr.static_rate       = cmd.alt_dest.static_rate;
2054         attr->alt_ah_attr.ah_flags          = cmd.alt_dest.is_global ? IB_AH_GRH : 0;
2055         attr->alt_ah_attr.port_num          = cmd.alt_dest.port_num;
2056
2057         if (qp->real_qp == qp) {
2058                 ret = ib_resolve_eth_l2_attrs(qp, attr, &cmd.attr_mask);
2059                 if (ret)
2060                         goto out;
2061                 ret = qp->device->modify_qp(qp, attr,
2062                         modify_qp_mask(qp->qp_type, cmd.attr_mask), &udata);
2063         } else {
2064                 ret = ib_modify_qp(qp, attr, modify_qp_mask(qp->qp_type, cmd.attr_mask));
2065         }
2066
2067         put_qp_read(qp);
2068
2069         if (ret)
2070                 goto out;
2071
2072         ret = in_len;
2073
2074 out:
2075         kfree(attr);
2076
2077         return ret;
2078 }
2079
2080 ssize_t ib_uverbs_destroy_qp(struct ib_uverbs_file *file,
2081                              const char __user *buf, int in_len,
2082                              int out_len)
2083 {
2084         struct ib_uverbs_destroy_qp      cmd;
2085         struct ib_uverbs_destroy_qp_resp resp;
2086         struct ib_uobject               *uobj;
2087         struct ib_qp                    *qp;
2088         struct ib_uqp_object            *obj;
2089         int                              ret = -EINVAL;
2090
2091         if (copy_from_user(&cmd, buf, sizeof cmd))
2092                 return -EFAULT;
2093
2094         memset(&resp, 0, sizeof resp);
2095
2096         uobj = idr_write_uobj(&ib_uverbs_qp_idr, cmd.qp_handle, file->ucontext);
2097         if (!uobj)
2098                 return -EINVAL;
2099         qp  = uobj->object;
2100         obj = container_of(uobj, struct ib_uqp_object, uevent.uobject);
2101
2102         if (!list_empty(&obj->mcast_list)) {
2103                 put_uobj_write(uobj);
2104                 return -EBUSY;
2105         }
2106
2107         ret = ib_destroy_qp(qp);
2108         if (!ret)
2109                 uobj->live = 0;
2110
2111         put_uobj_write(uobj);
2112
2113         if (ret)
2114                 return ret;
2115
2116         if (obj->uxrcd)
2117                 atomic_dec(&obj->uxrcd->refcnt);
2118
2119         idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
2120
2121         mutex_lock(&file->mutex);
2122         list_del(&uobj->list);
2123         mutex_unlock(&file->mutex);
2124
2125         ib_uverbs_release_uevent(file, &obj->uevent);
2126
2127         resp.events_reported = obj->uevent.events_reported;
2128
2129         put_uobj(uobj);
2130
2131         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2132                          &resp, sizeof resp))
2133                 return -EFAULT;
2134
2135         return in_len;
2136 }
2137
2138 ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
2139                             const char __user *buf, int in_len,
2140                             int out_len)
2141 {
2142         struct ib_uverbs_post_send      cmd;
2143         struct ib_uverbs_post_send_resp resp;
2144         struct ib_uverbs_send_wr       *user_wr;
2145         struct ib_send_wr              *wr = NULL, *last, *next, *bad_wr;
2146         struct ib_qp                   *qp;
2147         int                             i, sg_ind;
2148         int                             is_ud;
2149         ssize_t                         ret = -EINVAL;
2150
2151         if (copy_from_user(&cmd, buf, sizeof cmd))
2152                 return -EFAULT;
2153
2154         if (in_len < sizeof cmd + cmd.wqe_size * cmd.wr_count +
2155             cmd.sge_count * sizeof (struct ib_uverbs_sge))
2156                 return -EINVAL;
2157
2158         if (cmd.wqe_size < sizeof (struct ib_uverbs_send_wr))
2159                 return -EINVAL;
2160
2161         user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL);
2162         if (!user_wr)
2163                 return -ENOMEM;
2164
2165         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
2166         if (!qp)
2167                 goto out;
2168
2169         is_ud = qp->qp_type == IB_QPT_UD;
2170         sg_ind = 0;
2171         last = NULL;
2172         for (i = 0; i < cmd.wr_count; ++i) {
2173                 if (copy_from_user(user_wr,
2174                                    buf + sizeof cmd + i * cmd.wqe_size,
2175                                    cmd.wqe_size)) {
2176                         ret = -EFAULT;
2177                         goto out_put;
2178                 }
2179
2180                 if (user_wr->num_sge + sg_ind > cmd.sge_count) {
2181                         ret = -EINVAL;
2182                         goto out_put;
2183                 }
2184
2185                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
2186                                user_wr->num_sge * sizeof (struct ib_sge),
2187                                GFP_KERNEL);
2188                 if (!next) {
2189                         ret = -ENOMEM;
2190                         goto out_put;
2191                 }
2192
2193                 if (!last)
2194                         wr = next;
2195                 else
2196                         last->next = next;
2197                 last = next;
2198
2199                 next->next       = NULL;
2200                 next->wr_id      = user_wr->wr_id;
2201                 next->num_sge    = user_wr->num_sge;
2202                 next->opcode     = user_wr->opcode;
2203                 next->send_flags = user_wr->send_flags;
2204
2205                 if (is_ud) {
2206                         next->wr.ud.ah = idr_read_ah(user_wr->wr.ud.ah,
2207                                                      file->ucontext);
2208                         if (!next->wr.ud.ah) {
2209                                 ret = -EINVAL;
2210                                 goto out_put;
2211                         }
2212                         next->wr.ud.remote_qpn  = user_wr->wr.ud.remote_qpn;
2213                         next->wr.ud.remote_qkey = user_wr->wr.ud.remote_qkey;
2214                         if (next->opcode == IB_WR_SEND_WITH_IMM)
2215                                 next->ex.imm_data =
2216                                         (__be32 __force) user_wr->ex.imm_data;
2217                 } else {
2218                         switch (next->opcode) {
2219                         case IB_WR_RDMA_WRITE_WITH_IMM:
2220                                 next->ex.imm_data =
2221                                         (__be32 __force) user_wr->ex.imm_data;
2222                         case IB_WR_RDMA_WRITE:
2223                         case IB_WR_RDMA_READ:
2224                                 next->wr.rdma.remote_addr =
2225                                         user_wr->wr.rdma.remote_addr;
2226                                 next->wr.rdma.rkey        =
2227                                         user_wr->wr.rdma.rkey;
2228                                 break;
2229                         case IB_WR_SEND_WITH_IMM:
2230                                 next->ex.imm_data =
2231                                         (__be32 __force) user_wr->ex.imm_data;
2232                                 break;
2233                         case IB_WR_SEND_WITH_INV:
2234                                 next->ex.invalidate_rkey =
2235                                         user_wr->ex.invalidate_rkey;
2236                                 break;
2237                         case IB_WR_ATOMIC_CMP_AND_SWP:
2238                         case IB_WR_ATOMIC_FETCH_AND_ADD:
2239                                 next->wr.atomic.remote_addr =
2240                                         user_wr->wr.atomic.remote_addr;
2241                                 next->wr.atomic.compare_add =
2242                                         user_wr->wr.atomic.compare_add;
2243                                 next->wr.atomic.swap = user_wr->wr.atomic.swap;
2244                                 next->wr.atomic.rkey = user_wr->wr.atomic.rkey;
2245                                 break;
2246                         default:
2247                                 break;
2248                         }
2249                 }
2250
2251                 if (next->num_sge) {
2252                         next->sg_list = (void *) next +
2253                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
2254                         if (copy_from_user(next->sg_list,
2255                                            buf + sizeof cmd +
2256                                            cmd.wr_count * cmd.wqe_size +
2257                                            sg_ind * sizeof (struct ib_sge),
2258                                            next->num_sge * sizeof (struct ib_sge))) {
2259                                 ret = -EFAULT;
2260                                 goto out_put;
2261                         }
2262                         sg_ind += next->num_sge;
2263                 } else
2264                         next->sg_list = NULL;
2265         }
2266
2267         resp.bad_wr = 0;
2268         ret = qp->device->post_send(qp->real_qp, wr, &bad_wr);
2269         if (ret)
2270                 for (next = wr; next; next = next->next) {
2271                         ++resp.bad_wr;
2272                         if (next == bad_wr)
2273                                 break;
2274                 }
2275
2276         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2277                          &resp, sizeof resp))
2278                 ret = -EFAULT;
2279
2280 out_put:
2281         put_qp_read(qp);
2282
2283         while (wr) {
2284                 if (is_ud && wr->wr.ud.ah)
2285                         put_ah_read(wr->wr.ud.ah);
2286                 next = wr->next;
2287                 kfree(wr);
2288                 wr = next;
2289         }
2290
2291 out:
2292         kfree(user_wr);
2293
2294         return ret ? ret : in_len;
2295 }
2296
2297 static struct ib_recv_wr *ib_uverbs_unmarshall_recv(const char __user *buf,
2298                                                     int in_len,
2299                                                     u32 wr_count,
2300                                                     u32 sge_count,
2301                                                     u32 wqe_size)
2302 {
2303         struct ib_uverbs_recv_wr *user_wr;
2304         struct ib_recv_wr        *wr = NULL, *last, *next;
2305         int                       sg_ind;
2306         int                       i;
2307         int                       ret;
2308
2309         if (in_len < wqe_size * wr_count +
2310             sge_count * sizeof (struct ib_uverbs_sge))
2311                 return ERR_PTR(-EINVAL);
2312
2313         if (wqe_size < sizeof (struct ib_uverbs_recv_wr))
2314                 return ERR_PTR(-EINVAL);
2315
2316         user_wr = kmalloc(wqe_size, GFP_KERNEL);
2317         if (!user_wr)
2318                 return ERR_PTR(-ENOMEM);
2319
2320         sg_ind = 0;
2321         last = NULL;
2322         for (i = 0; i < wr_count; ++i) {
2323                 if (copy_from_user(user_wr, buf + i * wqe_size,
2324                                    wqe_size)) {
2325                         ret = -EFAULT;
2326                         goto err;
2327                 }
2328
2329                 if (user_wr->num_sge + sg_ind > sge_count) {
2330                         ret = -EINVAL;
2331                         goto err;
2332                 }
2333
2334                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
2335                                user_wr->num_sge * sizeof (struct ib_sge),
2336                                GFP_KERNEL);
2337                 if (!next) {
2338                         ret = -ENOMEM;
2339                         goto err;
2340                 }
2341
2342                 if (!last)
2343                         wr = next;
2344                 else
2345                         last->next = next;
2346                 last = next;
2347
2348                 next->next       = NULL;
2349                 next->wr_id      = user_wr->wr_id;
2350                 next->num_sge    = user_wr->num_sge;
2351
2352                 if (next->num_sge) {
2353                         next->sg_list = (void *) next +
2354                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
2355                         if (copy_from_user(next->sg_list,
2356                                            buf + wr_count * wqe_size +
2357                                            sg_ind * sizeof (struct ib_sge),
2358                                            next->num_sge * sizeof (struct ib_sge))) {
2359                                 ret = -EFAULT;
2360                                 goto err;
2361                         }
2362                         sg_ind += next->num_sge;
2363                 } else
2364                         next->sg_list = NULL;
2365         }
2366
2367         kfree(user_wr);
2368         return wr;
2369
2370 err:
2371         kfree(user_wr);
2372
2373         while (wr) {
2374                 next = wr->next;
2375                 kfree(wr);
2376                 wr = next;
2377         }
2378
2379         return ERR_PTR(ret);
2380 }
2381
2382 ssize_t ib_uverbs_post_recv(struct ib_uverbs_file *file,
2383                             const char __user *buf, int in_len,
2384                             int out_len)
2385 {
2386         struct ib_uverbs_post_recv      cmd;
2387         struct ib_uverbs_post_recv_resp resp;
2388         struct ib_recv_wr              *wr, *next, *bad_wr;
2389         struct ib_qp                   *qp;
2390         ssize_t                         ret = -EINVAL;
2391
2392         if (copy_from_user(&cmd, buf, sizeof cmd))
2393                 return -EFAULT;
2394
2395         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
2396                                        in_len - sizeof cmd, cmd.wr_count,
2397                                        cmd.sge_count, cmd.wqe_size);
2398         if (IS_ERR(wr))
2399                 return PTR_ERR(wr);
2400
2401         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
2402         if (!qp)
2403                 goto out;
2404
2405         resp.bad_wr = 0;
2406         ret = qp->device->post_recv(qp->real_qp, wr, &bad_wr);
2407
2408         put_qp_read(qp);
2409
2410         if (ret)
2411                 for (next = wr; next; next = next->next) {
2412                         ++resp.bad_wr;
2413                         if (next == bad_wr)
2414                                 break;
2415                 }
2416
2417         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2418                          &resp, sizeof resp))
2419                 ret = -EFAULT;
2420
2421 out:
2422         while (wr) {
2423                 next = wr->next;
2424                 kfree(wr);
2425                 wr = next;
2426         }
2427
2428         return ret ? ret : in_len;
2429 }
2430
2431 ssize_t ib_uverbs_post_srq_recv(struct ib_uverbs_file *file,
2432                                 const char __user *buf, int in_len,
2433                                 int out_len)
2434 {
2435         struct ib_uverbs_post_srq_recv      cmd;
2436         struct ib_uverbs_post_srq_recv_resp resp;
2437         struct ib_recv_wr                  *wr, *next, *bad_wr;
2438         struct ib_srq                      *srq;
2439         ssize_t                             ret = -EINVAL;
2440
2441         if (copy_from_user(&cmd, buf, sizeof cmd))
2442                 return -EFAULT;
2443
2444         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
2445                                        in_len - sizeof cmd, cmd.wr_count,
2446                                        cmd.sge_count, cmd.wqe_size);
2447         if (IS_ERR(wr))
2448                 return PTR_ERR(wr);
2449
2450         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2451         if (!srq)
2452                 goto out;
2453
2454         resp.bad_wr = 0;
2455         ret = srq->device->post_srq_recv(srq, wr, &bad_wr);
2456
2457         put_srq_read(srq);
2458
2459         if (ret)
2460                 for (next = wr; next; next = next->next) {
2461                         ++resp.bad_wr;
2462                         if (next == bad_wr)
2463                                 break;
2464                 }
2465
2466         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2467                          &resp, sizeof resp))
2468                 ret = -EFAULT;
2469
2470 out:
2471         while (wr) {
2472                 next = wr->next;
2473                 kfree(wr);
2474                 wr = next;
2475         }
2476
2477         return ret ? ret : in_len;
2478 }
2479
2480 ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
2481                             const char __user *buf, int in_len,
2482                             int out_len)
2483 {
2484         struct ib_uverbs_create_ah       cmd;
2485         struct ib_uverbs_create_ah_resp  resp;
2486         struct ib_uobject               *uobj;
2487         struct ib_pd                    *pd;
2488         struct ib_ah                    *ah;
2489         struct ib_ah_attr               attr;
2490         int ret;
2491
2492         if (out_len < sizeof resp)
2493                 return -ENOSPC;
2494
2495         if (copy_from_user(&cmd, buf, sizeof cmd))
2496                 return -EFAULT;
2497
2498         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
2499         if (!uobj)
2500                 return -ENOMEM;
2501
2502         init_uobj(uobj, cmd.user_handle, file->ucontext, &ah_lock_class);
2503         down_write(&uobj->mutex);
2504
2505         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
2506         if (!pd) {
2507                 ret = -EINVAL;
2508                 goto err;
2509         }
2510
2511         attr.dlid              = cmd.attr.dlid;
2512         attr.sl                = cmd.attr.sl;
2513         attr.src_path_bits     = cmd.attr.src_path_bits;
2514         attr.static_rate       = cmd.attr.static_rate;
2515         attr.ah_flags          = cmd.attr.is_global ? IB_AH_GRH : 0;
2516         attr.port_num          = cmd.attr.port_num;
2517         attr.grh.flow_label    = cmd.attr.grh.flow_label;
2518         attr.grh.sgid_index    = cmd.attr.grh.sgid_index;
2519         attr.grh.hop_limit     = cmd.attr.grh.hop_limit;
2520         attr.grh.traffic_class = cmd.attr.grh.traffic_class;
2521         memcpy(attr.grh.dgid.raw, cmd.attr.grh.dgid, 16);
2522
2523         ah = ib_create_ah(pd, &attr);
2524         if (IS_ERR(ah)) {
2525                 ret = PTR_ERR(ah);
2526                 goto err_put;
2527         }
2528
2529         ah->uobject  = uobj;
2530         uobj->object = ah;
2531
2532         ret = idr_add_uobj(&ib_uverbs_ah_idr, uobj);
2533         if (ret)
2534                 goto err_destroy;
2535
2536         resp.ah_handle = uobj->id;
2537
2538         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2539                          &resp, sizeof resp)) {
2540                 ret = -EFAULT;
2541                 goto err_copy;
2542         }
2543
2544         put_pd_read(pd);
2545
2546         mutex_lock(&file->mutex);
2547         list_add_tail(&uobj->list, &file->ucontext->ah_list);
2548         mutex_unlock(&file->mutex);
2549
2550         uobj->live = 1;
2551
2552         up_write(&uobj->mutex);
2553
2554         return in_len;
2555
2556 err_copy:
2557         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
2558
2559 err_destroy:
2560         ib_destroy_ah(ah);
2561
2562 err_put:
2563         put_pd_read(pd);
2564
2565 err:
2566         put_uobj_write(uobj);
2567         return ret;
2568 }
2569
2570 ssize_t ib_uverbs_destroy_ah(struct ib_uverbs_file *file,
2571                              const char __user *buf, int in_len, int out_len)
2572 {
2573         struct ib_uverbs_destroy_ah cmd;
2574         struct ib_ah               *ah;
2575         struct ib_uobject          *uobj;
2576         int                         ret;
2577
2578         if (copy_from_user(&cmd, buf, sizeof cmd))
2579                 return -EFAULT;
2580
2581         uobj = idr_write_uobj(&ib_uverbs_ah_idr, cmd.ah_handle, file->ucontext);
2582         if (!uobj)
2583                 return -EINVAL;
2584         ah = uobj->object;
2585
2586         ret = ib_destroy_ah(ah);
2587         if (!ret)
2588                 uobj->live = 0;
2589
2590         put_uobj_write(uobj);
2591
2592         if (ret)
2593                 return ret;
2594
2595         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
2596
2597         mutex_lock(&file->mutex);
2598         list_del(&uobj->list);
2599         mutex_unlock(&file->mutex);
2600
2601         put_uobj(uobj);
2602
2603         return in_len;
2604 }
2605
2606 ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
2607                                const char __user *buf, int in_len,
2608                                int out_len)
2609 {
2610         struct ib_uverbs_attach_mcast cmd;
2611         struct ib_qp                 *qp;
2612         struct ib_uqp_object         *obj;
2613         struct ib_uverbs_mcast_entry *mcast;
2614         int                           ret;
2615
2616         if (copy_from_user(&cmd, buf, sizeof cmd))
2617                 return -EFAULT;
2618
2619         qp = idr_write_qp(cmd.qp_handle, file->ucontext);
2620         if (!qp)
2621                 return -EINVAL;
2622
2623         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
2624
2625         list_for_each_entry(mcast, &obj->mcast_list, list)
2626                 if (cmd.mlid == mcast->lid &&
2627                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
2628                         ret = 0;
2629                         goto out_put;
2630                 }
2631
2632         mcast = kmalloc(sizeof *mcast, GFP_KERNEL);
2633         if (!mcast) {
2634                 ret = -ENOMEM;
2635                 goto out_put;
2636         }
2637
2638         mcast->lid = cmd.mlid;
2639         memcpy(mcast->gid.raw, cmd.gid, sizeof mcast->gid.raw);
2640
2641         ret = ib_attach_mcast(qp, &mcast->gid, cmd.mlid);
2642         if (!ret)
2643                 list_add_tail(&mcast->list, &obj->mcast_list);
2644         else
2645                 kfree(mcast);
2646
2647 out_put:
2648         put_qp_write(qp);
2649
2650         return ret ? ret : in_len;
2651 }
2652
2653 ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
2654                                const char __user *buf, int in_len,
2655                                int out_len)
2656 {
2657         struct ib_uverbs_detach_mcast cmd;
2658         struct ib_uqp_object         *obj;
2659         struct ib_qp                 *qp;
2660         struct ib_uverbs_mcast_entry *mcast;
2661         int                           ret = -EINVAL;
2662
2663         if (copy_from_user(&cmd, buf, sizeof cmd))
2664                 return -EFAULT;
2665
2666         qp = idr_write_qp(cmd.qp_handle, file->ucontext);
2667         if (!qp)
2668                 return -EINVAL;
2669
2670         ret = ib_detach_mcast(qp, (union ib_gid *) cmd.gid, cmd.mlid);
2671         if (ret)
2672                 goto out_put;
2673
2674         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
2675
2676         list_for_each_entry(mcast, &obj->mcast_list, list)
2677                 if (cmd.mlid == mcast->lid &&
2678                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
2679                         list_del(&mcast->list);
2680                         kfree(mcast);
2681                         break;
2682                 }
2683
2684 out_put:
2685         put_qp_write(qp);
2686
2687         return ret ? ret : in_len;
2688 }
2689
2690 static int kern_spec_to_ib_spec(struct ib_uverbs_flow_spec *kern_spec,
2691                                 union ib_flow_spec *ib_spec)
2692 {
2693         if (kern_spec->reserved)
2694                 return -EINVAL;
2695
2696         ib_spec->type = kern_spec->type;
2697
2698         switch (ib_spec->type) {
2699         case IB_FLOW_SPEC_ETH:
2700                 ib_spec->eth.size = sizeof(struct ib_flow_spec_eth);
2701                 if (ib_spec->eth.size != kern_spec->eth.size)
2702                         return -EINVAL;
2703                 memcpy(&ib_spec->eth.val, &kern_spec->eth.val,
2704                        sizeof(struct ib_flow_eth_filter));
2705                 memcpy(&ib_spec->eth.mask, &kern_spec->eth.mask,
2706                        sizeof(struct ib_flow_eth_filter));
2707                 break;
2708         case IB_FLOW_SPEC_IPV4:
2709                 ib_spec->ipv4.size = sizeof(struct ib_flow_spec_ipv4);
2710                 if (ib_spec->ipv4.size != kern_spec->ipv4.size)
2711                         return -EINVAL;
2712                 memcpy(&ib_spec->ipv4.val, &kern_spec->ipv4.val,
2713                        sizeof(struct ib_flow_ipv4_filter));
2714                 memcpy(&ib_spec->ipv4.mask, &kern_spec->ipv4.mask,
2715                        sizeof(struct ib_flow_ipv4_filter));
2716                 break;
2717         case IB_FLOW_SPEC_TCP:
2718         case IB_FLOW_SPEC_UDP:
2719                 ib_spec->tcp_udp.size = sizeof(struct ib_flow_spec_tcp_udp);
2720                 if (ib_spec->tcp_udp.size != kern_spec->tcp_udp.size)
2721                         return -EINVAL;
2722                 memcpy(&ib_spec->tcp_udp.val, &kern_spec->tcp_udp.val,
2723                        sizeof(struct ib_flow_tcp_udp_filter));
2724                 memcpy(&ib_spec->tcp_udp.mask, &kern_spec->tcp_udp.mask,
2725                        sizeof(struct ib_flow_tcp_udp_filter));
2726                 break;
2727         default:
2728                 return -EINVAL;
2729         }
2730         return 0;
2731 }
2732
2733 int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
2734                              struct ib_udata *ucore,
2735                              struct ib_udata *uhw)
2736 {
2737         struct ib_uverbs_create_flow      cmd;
2738         struct ib_uverbs_create_flow_resp resp;
2739         struct ib_uobject                 *uobj;
2740         struct ib_flow                    *flow_id;
2741         struct ib_uverbs_flow_attr        *kern_flow_attr;
2742         struct ib_flow_attr               *flow_attr;
2743         struct ib_qp                      *qp;
2744         int err = 0;
2745         void *kern_spec;
2746         void *ib_spec;
2747         int i;
2748
2749         if (ucore->inlen < sizeof(cmd))
2750                 return -EINVAL;
2751
2752         if (ucore->outlen < sizeof(resp))
2753                 return -ENOSPC;
2754
2755         err = ib_copy_from_udata(&cmd, ucore, sizeof(cmd));
2756         if (err)
2757                 return err;
2758
2759         ucore->inbuf += sizeof(cmd);
2760         ucore->inlen -= sizeof(cmd);
2761
2762         if (cmd.comp_mask)
2763                 return -EINVAL;
2764
2765         if ((cmd.flow_attr.type == IB_FLOW_ATTR_SNIFFER &&
2766              !capable(CAP_NET_ADMIN)) || !capable(CAP_NET_RAW))
2767                 return -EPERM;
2768
2769         if (cmd.flow_attr.num_of_specs > IB_FLOW_SPEC_SUPPORT_LAYERS)
2770                 return -EINVAL;
2771
2772         if (cmd.flow_attr.size > ucore->inlen ||
2773             cmd.flow_attr.size >
2774             (cmd.flow_attr.num_of_specs * sizeof(struct ib_uverbs_flow_spec)))
2775                 return -EINVAL;
2776
2777         if (cmd.flow_attr.reserved[0] ||
2778             cmd.flow_attr.reserved[1])
2779                 return -EINVAL;
2780
2781         if (cmd.flow_attr.num_of_specs) {
2782                 kern_flow_attr = kmalloc(sizeof(*kern_flow_attr) + cmd.flow_attr.size,
2783                                          GFP_KERNEL);
2784                 if (!kern_flow_attr)
2785                         return -ENOMEM;
2786
2787                 memcpy(kern_flow_attr, &cmd.flow_attr, sizeof(*kern_flow_attr));
2788                 err = ib_copy_from_udata(kern_flow_attr + 1, ucore,
2789                                          cmd.flow_attr.size);
2790                 if (err)
2791                         goto err_free_attr;
2792         } else {
2793                 kern_flow_attr = &cmd.flow_attr;
2794         }
2795
2796         uobj = kmalloc(sizeof(*uobj), GFP_KERNEL);
2797         if (!uobj) {
2798                 err = -ENOMEM;
2799                 goto err_free_attr;
2800         }
2801         init_uobj(uobj, 0, file->ucontext, &rule_lock_class);
2802         down_write(&uobj->mutex);
2803
2804         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
2805         if (!qp) {
2806                 err = -EINVAL;
2807                 goto err_uobj;
2808         }
2809
2810         flow_attr = kmalloc(sizeof(*flow_attr) + cmd.flow_attr.size, GFP_KERNEL);
2811         if (!flow_attr) {
2812                 err = -ENOMEM;
2813                 goto err_put;
2814         }
2815
2816         flow_attr->type = kern_flow_attr->type;
2817         flow_attr->priority = kern_flow_attr->priority;
2818         flow_attr->num_of_specs = kern_flow_attr->num_of_specs;
2819         flow_attr->port = kern_flow_attr->port;
2820         flow_attr->flags = kern_flow_attr->flags;
2821         flow_attr->size = sizeof(*flow_attr);
2822
2823         kern_spec = kern_flow_attr + 1;
2824         ib_spec = flow_attr + 1;
2825         for (i = 0; i < flow_attr->num_of_specs &&
2826              cmd.flow_attr.size > offsetof(struct ib_uverbs_flow_spec, reserved) &&
2827              cmd.flow_attr.size >=
2828              ((struct ib_uverbs_flow_spec *)kern_spec)->size; i++) {
2829                 err = kern_spec_to_ib_spec(kern_spec, ib_spec);
2830                 if (err)
2831                         goto err_free;
2832                 flow_attr->size +=
2833                         ((union ib_flow_spec *) ib_spec)->size;
2834                 cmd.flow_attr.size -= ((struct ib_uverbs_flow_spec *)kern_spec)->size;
2835                 kern_spec += ((struct ib_uverbs_flow_spec *) kern_spec)->size;
2836                 ib_spec += ((union ib_flow_spec *) ib_spec)->size;
2837         }
2838         if (cmd.flow_attr.size || (i != flow_attr->num_of_specs)) {
2839                 pr_warn("create flow failed, flow %d: %d bytes left from uverb cmd\n",
2840                         i, cmd.flow_attr.size);
2841                 err = -EINVAL;
2842                 goto err_free;
2843         }
2844         flow_id = ib_create_flow(qp, flow_attr, IB_FLOW_DOMAIN_USER);
2845         if (IS_ERR(flow_id)) {
2846                 err = PTR_ERR(flow_id);
2847                 goto err_free;
2848         }
2849         flow_id->qp = qp;
2850         flow_id->uobject = uobj;
2851         uobj->object = flow_id;
2852
2853         err = idr_add_uobj(&ib_uverbs_rule_idr, uobj);
2854         if (err)
2855                 goto destroy_flow;
2856
2857         memset(&resp, 0, sizeof(resp));
2858         resp.flow_handle = uobj->id;
2859
2860         err = ib_copy_to_udata(ucore,
2861                                &resp, sizeof(resp));
2862         if (err)
2863                 goto err_copy;
2864
2865         put_qp_read(qp);
2866         mutex_lock(&file->mutex);
2867         list_add_tail(&uobj->list, &file->ucontext->rule_list);
2868         mutex_unlock(&file->mutex);
2869
2870         uobj->live = 1;
2871
2872         up_write(&uobj->mutex);
2873         kfree(flow_attr);
2874         if (cmd.flow_attr.num_of_specs)
2875                 kfree(kern_flow_attr);
2876         return 0;
2877 err_copy:
2878         idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
2879 destroy_flow:
2880         ib_destroy_flow(flow_id);
2881 err_free:
2882         kfree(flow_attr);
2883 err_put:
2884         put_qp_read(qp);
2885 err_uobj:
2886         put_uobj_write(uobj);
2887 err_free_attr:
2888         if (cmd.flow_attr.num_of_specs)
2889                 kfree(kern_flow_attr);
2890         return err;
2891 }
2892
2893 int ib_uverbs_ex_destroy_flow(struct ib_uverbs_file *file,
2894                               struct ib_udata *ucore,
2895                               struct ib_udata *uhw)
2896 {
2897         struct ib_uverbs_destroy_flow   cmd;
2898         struct ib_flow                  *flow_id;
2899         struct ib_uobject               *uobj;
2900         int                             ret;
2901
2902         if (ucore->inlen < sizeof(cmd))
2903                 return -EINVAL;
2904
2905         ret = ib_copy_from_udata(&cmd, ucore, sizeof(cmd));
2906         if (ret)
2907                 return ret;
2908
2909         if (cmd.comp_mask)
2910                 return -EINVAL;
2911
2912         uobj = idr_write_uobj(&ib_uverbs_rule_idr, cmd.flow_handle,
2913                               file->ucontext);
2914         if (!uobj)
2915                 return -EINVAL;
2916         flow_id = uobj->object;
2917
2918         ret = ib_destroy_flow(flow_id);
2919         if (!ret)
2920                 uobj->live = 0;
2921
2922         put_uobj_write(uobj);
2923
2924         idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
2925
2926         mutex_lock(&file->mutex);
2927         list_del(&uobj->list);
2928         mutex_unlock(&file->mutex);
2929
2930         put_uobj(uobj);
2931
2932         return ret;
2933 }
2934
2935 static int __uverbs_create_xsrq(struct ib_uverbs_file *file,
2936                                 struct ib_uverbs_create_xsrq *cmd,
2937                                 struct ib_udata *udata)
2938 {
2939         struct ib_uverbs_create_srq_resp resp;
2940         struct ib_usrq_object           *obj;
2941         struct ib_pd                    *pd;
2942         struct ib_srq                   *srq;
2943         struct ib_uobject               *uninitialized_var(xrcd_uobj);
2944         struct ib_srq_init_attr          attr;
2945         int ret;
2946
2947         obj = kmalloc(sizeof *obj, GFP_KERNEL);
2948         if (!obj)
2949                 return -ENOMEM;
2950
2951         init_uobj(&obj->uevent.uobject, cmd->user_handle, file->ucontext, &srq_lock_class);
2952         down_write(&obj->uevent.uobject.mutex);
2953
2954         if (cmd->srq_type == IB_SRQT_XRC) {
2955                 attr.ext.xrc.xrcd  = idr_read_xrcd(cmd->xrcd_handle, file->ucontext, &xrcd_uobj);
2956                 if (!attr.ext.xrc.xrcd) {
2957                         ret = -EINVAL;
2958                         goto err;
2959                 }
2960
2961                 obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, uobject);
2962                 atomic_inc(&obj->uxrcd->refcnt);
2963
2964                 attr.ext.xrc.cq  = idr_read_cq(cmd->cq_handle, file->ucontext, 0);
2965                 if (!attr.ext.xrc.cq) {
2966                         ret = -EINVAL;
2967                         goto err_put_xrcd;
2968                 }
2969         }
2970
2971         pd  = idr_read_pd(cmd->pd_handle, file->ucontext);
2972         if (!pd) {
2973                 ret = -EINVAL;
2974                 goto err_put_cq;
2975         }
2976
2977         attr.event_handler  = ib_uverbs_srq_event_handler;
2978         attr.srq_context    = file;
2979         attr.srq_type       = cmd->srq_type;
2980         attr.attr.max_wr    = cmd->max_wr;
2981         attr.attr.max_sge   = cmd->max_sge;
2982         attr.attr.srq_limit = cmd->srq_limit;
2983
2984         obj->uevent.events_reported = 0;
2985         INIT_LIST_HEAD(&obj->uevent.event_list);
2986
2987         srq = pd->device->create_srq(pd, &attr, udata);
2988         if (IS_ERR(srq)) {
2989                 ret = PTR_ERR(srq);
2990                 goto err_put;
2991         }
2992
2993         srq->device        = pd->device;
2994         srq->pd            = pd;
2995         srq->srq_type      = cmd->srq_type;
2996         srq->uobject       = &obj->uevent.uobject;
2997         srq->event_handler = attr.event_handler;
2998         srq->srq_context   = attr.srq_context;
2999
3000         if (cmd->srq_type == IB_SRQT_XRC) {
3001                 srq->ext.xrc.cq   = attr.ext.xrc.cq;
3002                 srq->ext.xrc.xrcd = attr.ext.xrc.xrcd;
3003                 atomic_inc(&attr.ext.xrc.cq->usecnt);
3004                 atomic_inc(&attr.ext.xrc.xrcd->usecnt);
3005         }
3006
3007         atomic_inc(&pd->usecnt);
3008         atomic_set(&srq->usecnt, 0);
3009
3010         obj->uevent.uobject.object = srq;
3011         ret = idr_add_uobj(&ib_uverbs_srq_idr, &obj->uevent.uobject);
3012         if (ret)
3013                 goto err_destroy;
3014
3015         memset(&resp, 0, sizeof resp);
3016         resp.srq_handle = obj->uevent.uobject.id;
3017         resp.max_wr     = attr.attr.max_wr;
3018         resp.max_sge    = attr.attr.max_sge;
3019         if (cmd->srq_type == IB_SRQT_XRC)
3020                 resp.srqn = srq->ext.xrc.srq_num;
3021
3022         if (copy_to_user((void __user *) (unsigned long) cmd->response,
3023                          &resp, sizeof resp)) {
3024                 ret = -EFAULT;
3025                 goto err_copy;
3026         }
3027
3028         if (cmd->srq_type == IB_SRQT_XRC) {
3029                 put_uobj_read(xrcd_uobj);
3030                 put_cq_read(attr.ext.xrc.cq);
3031         }
3032         put_pd_read(pd);
3033
3034         mutex_lock(&file->mutex);
3035         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->srq_list);
3036         mutex_unlock(&file->mutex);
3037
3038         obj->uevent.uobject.live = 1;
3039
3040         up_write(&obj->uevent.uobject.mutex);
3041
3042         return 0;
3043
3044 err_copy:
3045         idr_remove_uobj(&ib_uverbs_srq_idr, &obj->uevent.uobject);
3046
3047 err_destroy:
3048         ib_destroy_srq(srq);
3049
3050 err_put:
3051         put_pd_read(pd);
3052
3053 err_put_cq:
3054         if (cmd->srq_type == IB_SRQT_XRC)
3055                 put_cq_read(attr.ext.xrc.cq);
3056
3057 err_put_xrcd:
3058         if (cmd->srq_type == IB_SRQT_XRC) {
3059                 atomic_dec(&obj->uxrcd->refcnt);
3060                 put_uobj_read(xrcd_uobj);
3061         }
3062
3063 err:
3064         put_uobj_write(&obj->uevent.uobject);
3065         return ret;
3066 }
3067
3068 ssize_t ib_uverbs_create_srq(struct ib_uverbs_file *file,
3069                              const char __user *buf, int in_len,
3070                              int out_len)
3071 {
3072         struct ib_uverbs_create_srq      cmd;
3073         struct ib_uverbs_create_xsrq     xcmd;
3074         struct ib_uverbs_create_srq_resp resp;
3075         struct ib_udata                  udata;
3076         int ret;
3077
3078         if (out_len < sizeof resp)
3079                 return -ENOSPC;
3080
3081         if (copy_from_user(&cmd, buf, sizeof cmd))
3082                 return -EFAULT;
3083
3084         xcmd.response    = cmd.response;
3085         xcmd.user_handle = cmd.user_handle;
3086         xcmd.srq_type    = IB_SRQT_BASIC;
3087         xcmd.pd_handle   = cmd.pd_handle;
3088         xcmd.max_wr      = cmd.max_wr;
3089         xcmd.max_sge     = cmd.max_sge;
3090         xcmd.srq_limit   = cmd.srq_limit;
3091
3092         INIT_UDATA(&udata, buf + sizeof cmd,
3093                    (unsigned long) cmd.response + sizeof resp,
3094                    in_len - sizeof cmd, out_len - sizeof resp);
3095
3096         ret = __uverbs_create_xsrq(file, &xcmd, &udata);
3097         if (ret)
3098                 return ret;
3099
3100         return in_len;
3101 }
3102
3103 ssize_t ib_uverbs_create_xsrq(struct ib_uverbs_file *file,
3104                               const char __user *buf, int in_len, int out_len)
3105 {
3106         struct ib_uverbs_create_xsrq     cmd;
3107         struct ib_uverbs_create_srq_resp resp;
3108         struct ib_udata                  udata;
3109         int ret;
3110
3111         if (out_len < sizeof resp)
3112                 return -ENOSPC;
3113
3114         if (copy_from_user(&cmd, buf, sizeof cmd))
3115                 return -EFAULT;
3116
3117         INIT_UDATA(&udata, buf + sizeof cmd,
3118                    (unsigned long) cmd.response + sizeof resp,
3119                    in_len - sizeof cmd, out_len - sizeof resp);
3120
3121         ret = __uverbs_create_xsrq(file, &cmd, &udata);
3122         if (ret)
3123                 return ret;
3124
3125         return in_len;
3126 }
3127
3128 ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
3129                              const char __user *buf, int in_len,
3130                              int out_len)
3131 {
3132         struct ib_uverbs_modify_srq cmd;
3133         struct ib_udata             udata;
3134         struct ib_srq              *srq;
3135         struct ib_srq_attr          attr;
3136         int                         ret;
3137
3138         if (copy_from_user(&cmd, buf, sizeof cmd))
3139                 return -EFAULT;
3140
3141         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
3142                    out_len);
3143
3144         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
3145         if (!srq)
3146                 return -EINVAL;
3147
3148         attr.max_wr    = cmd.max_wr;
3149         attr.srq_limit = cmd.srq_limit;
3150
3151         ret = srq->device->modify_srq(srq, &attr, cmd.attr_mask, &udata);
3152
3153         put_srq_read(srq);
3154
3155         return ret ? ret : in_len;
3156 }
3157
3158 ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
3159                             const char __user *buf,
3160                             int in_len, int out_len)
3161 {
3162         struct ib_uverbs_query_srq      cmd;
3163         struct ib_uverbs_query_srq_resp resp;
3164         struct ib_srq_attr              attr;
3165         struct ib_srq                   *srq;
3166         int                             ret;
3167
3168         if (out_len < sizeof resp)
3169                 return -ENOSPC;
3170
3171         if (copy_from_user(&cmd, buf, sizeof cmd))
3172                 return -EFAULT;
3173
3174         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
3175         if (!srq)
3176                 return -EINVAL;
3177
3178         ret = ib_query_srq(srq, &attr);
3179
3180         put_srq_read(srq);
3181
3182         if (ret)
3183                 return ret;
3184
3185         memset(&resp, 0, sizeof resp);
3186
3187         resp.max_wr    = attr.max_wr;
3188         resp.max_sge   = attr.max_sge;
3189         resp.srq_limit = attr.srq_limit;
3190
3191         if (copy_to_user((void __user *) (unsigned long) cmd.response,
3192                          &resp, sizeof resp))
3193                 return -EFAULT;
3194
3195         return in_len;
3196 }
3197
3198 ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
3199                               const char __user *buf, int in_len,
3200                               int out_len)
3201 {
3202         struct ib_uverbs_destroy_srq      cmd;
3203         struct ib_uverbs_destroy_srq_resp resp;
3204         struct ib_uobject                *uobj;
3205         struct ib_srq                    *srq;
3206         struct ib_uevent_object          *obj;
3207         int                               ret = -EINVAL;
3208         struct ib_usrq_object            *us;
3209         enum ib_srq_type                  srq_type;
3210
3211         if (copy_from_user(&cmd, buf, sizeof cmd))
3212                 return -EFAULT;
3213
3214         uobj = idr_write_uobj(&ib_uverbs_srq_idr, cmd.srq_handle, file->ucontext);
3215         if (!uobj)
3216                 return -EINVAL;
3217         srq = uobj->object;
3218         obj = container_of(uobj, struct ib_uevent_object, uobject);
3219         srq_type = srq->srq_type;
3220
3221         ret = ib_destroy_srq(srq);
3222         if (!ret)
3223                 uobj->live = 0;
3224
3225         put_uobj_write(uobj);
3226
3227         if (ret)
3228                 return ret;
3229
3230         if (srq_type == IB_SRQT_XRC) {
3231                 us = container_of(obj, struct ib_usrq_object, uevent);
3232                 atomic_dec(&us->uxrcd->refcnt);
3233         }
3234
3235         idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
3236
3237         mutex_lock(&file->mutex);
3238         list_del(&uobj->list);
3239         mutex_unlock(&file->mutex);
3240
3241         ib_uverbs_release_uevent(file, obj);
3242
3243         memset(&resp, 0, sizeof resp);
3244         resp.events_reported = obj->events_reported;
3245
3246         put_uobj(uobj);
3247
3248         if (copy_to_user((void __user *) (unsigned long) cmd.response,
3249                          &resp, sizeof resp))
3250                 ret = -EFAULT;
3251
3252         return ret ? ret : in_len;
3253 }