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