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