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 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 PathScale, Inc.  All rights reserved.
   5  * Copyright (c) 2006 Mellanox Technologies.  All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  * $Id: uverbs_cmd.c 2708 2005-06-24 17:27:21Z roland $
  36  */
  37
  38 #include <linux/file.h>
  39 #include <linux/fs.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "uverbs.h"
  44
  45 static struct lock_class_key pd_lock_key;
  46 static struct lock_class_key mr_lock_key;
  47 static struct lock_class_key cq_lock_key;
  48 static struct lock_class_key qp_lock_key;
  49 static struct lock_class_key ah_lock_key;
  50 static struct lock_class_key srq_lock_key;
  51
  52 #define INIT_UDATA(udata, ibuf, obuf, ilen, olen)                       \
  53         do {                                                            \
  54                 (udata)->inbuf  = (void __user *) (ibuf);               \
  55                 (udata)->outbuf = (void __user *) (obuf);               \
  56                 (udata)->inlen  = (ilen);                               \
  57                 (udata)->outlen = (olen);                               \
  58         } while (0)
  59
  60 /*
  61  * The ib_uobject locking scheme is as follows:
  62  *
  63  * - ib_uverbs_idr_lock protects the uverbs idrs themselves, so it
  64  *   needs to be held during all idr operations.  When an object is
  65  *   looked up, a reference must be taken on the object's kref before
  66  *   dropping this lock.
  67  *
  68  * - Each object also has an rwsem.  This rwsem must be held for
  69  *   reading while an operation that uses the object is performed.
  70  *   For example, while registering an MR, the associated PD's
  71  *   uobject.mutex must be held for reading.  The rwsem must be held
  72  *   for writing while initializing or destroying an object.
  73  *
  74  * - In addition, each object has a "live" flag.  If this flag is not
  75  *   set, then lookups of the object will fail even if it is found in
  76  *   the idr.  This handles a reader that blocks and does not acquire
  77  *   the rwsem until after the object is destroyed.  The destroy
  78  *   operation will set the live flag to 0 and then drop the rwsem;
  79  *   this will allow the reader to acquire the rwsem, see that the
  80  *   live flag is 0, and then drop the rwsem and its reference to
  81  *   object.  The underlying storage will not be freed until the last
  82  *   reference to the object is dropped.
  83  */
  84
  85 static void init_uobj(struct ib_uobject *uobj, u64 user_handle,
  86                       struct ib_ucontext *context, struct lock_class_key *key)
  87 {
  88         uobj->user_handle = user_handle;
  89         uobj->context     = context;
  90         kref_init(&uobj->ref);
  91         init_rwsem(&uobj->mutex);
  92         lockdep_set_class(&uobj->mutex, key);
  93         uobj->live        = 0;
  94 }
  95
  96 static void release_uobj(struct kref *kref)
  97 {
  98         kfree(container_of(kref, struct ib_uobject, ref));
  99 }
 100
 101 static void put_uobj(struct ib_uobject *uobj)
 102 {
 103         kref_put(&uobj->ref, release_uobj);
 104 }
 105
 106 static void put_uobj_read(struct ib_uobject *uobj)
 107 {
 108         up_read(&uobj->mutex);
 109         put_uobj(uobj);
 110 }
 111
 112 static void put_uobj_write(struct ib_uobject *uobj)
 113 {
 114         up_write(&uobj->mutex);
 115         put_uobj(uobj);
 116 }
 117
 118 static int idr_add_uobj(struct idr *idr, struct ib_uobject *uobj)
 119 {
 120         int ret;
 121
 122 retry:
 123         if (!idr_pre_get(idr, GFP_KERNEL))
 124                 return -ENOMEM;
 125
 126         spin_lock(&ib_uverbs_idr_lock);
 127         ret = idr_get_new(idr, uobj, &uobj->id);
 128         spin_unlock(&ib_uverbs_idr_lock);
 129
 130         if (ret == -EAGAIN)
 131                 goto retry;
 132
 133         return ret;
 134 }
 135
 136 void idr_remove_uobj(struct idr *idr, struct ib_uobject *uobj)
 137 {
 138         spin_lock(&ib_uverbs_idr_lock);
 139         idr_remove(idr, uobj->id);
 140         spin_unlock(&ib_uverbs_idr_lock);
 141 }
 142
 143 static struct ib_uobject *__idr_get_uobj(struct idr *idr, int id,
 144                                          struct ib_ucontext *context)
 145 {
 146         struct ib_uobject *uobj;
 147
 148         spin_lock(&ib_uverbs_idr_lock);
 149         uobj = idr_find(idr, id);
 150         if (uobj)
 151                 kref_get(&uobj->ref);
 152         spin_unlock(&ib_uverbs_idr_lock);
 153
 154         return uobj;
 155 }
 156
 157 static struct ib_uobject *idr_read_uobj(struct idr *idr, int id,
 158                                         struct ib_ucontext *context, int nested)
 159 {
 160         struct ib_uobject *uobj;
 161
 162         uobj = __idr_get_uobj(idr, id, context);
 163         if (!uobj)
 164                 return NULL;
 165
 166         if (nested)
 167                 down_read_nested(&uobj->mutex, SINGLE_DEPTH_NESTING);
 168         else
 169                 down_read(&uobj->mutex);
 170         if (!uobj->live) {
 171                 put_uobj_read(uobj);
 172                 return NULL;
 173         }
 174
 175         return uobj;
 176 }
 177
 178 static struct ib_uobject *idr_write_uobj(struct idr *idr, int id,
 179                                          struct ib_ucontext *context)
 180 {
 181         struct ib_uobject *uobj;
 182
 183         uobj = __idr_get_uobj(idr, id, context);
 184         if (!uobj)
 185                 return NULL;
 186
 187         down_write(&uobj->mutex);
 188         if (!uobj->live) {
 189                 put_uobj_write(uobj);
 190                 return NULL;
 191         }
 192
 193         return uobj;
 194 }
 195
 196 static void *idr_read_obj(struct idr *idr, int id, struct ib_ucontext *context,
 197                           int nested)
 198 {
 199         struct ib_uobject *uobj;
 200
 201         uobj = idr_read_uobj(idr, id, context, nested);
 202         return uobj ? uobj->object : NULL;
 203 }
 204
 205 static struct ib_pd *idr_read_pd(int pd_handle, struct ib_ucontext *context)
 206 {
 207         return idr_read_obj(&ib_uverbs_pd_idr, pd_handle, context, 0);
 208 }
 209
 210 static void put_pd_read(struct ib_pd *pd)
 211 {
 212         put_uobj_read(pd->uobject);
 213 }
 214
 215 static struct ib_cq *idr_read_cq(int cq_handle, struct ib_ucontext *context, int nested)
 216 {
 217         return idr_read_obj(&ib_uverbs_cq_idr, cq_handle, context, nested);
 218 }
 219
 220 static void put_cq_read(struct ib_cq *cq)
 221 {
 222         put_uobj_read(cq->uobject);
 223 }
 224
 225 static struct ib_ah *idr_read_ah(int ah_handle, struct ib_ucontext *context)
 226 {
 227         return idr_read_obj(&ib_uverbs_ah_idr, ah_handle, context, 0);
 228 }
 229
 230 static void put_ah_read(struct ib_ah *ah)
 231 {
 232         put_uobj_read(ah->uobject);
 233 }
 234
 235 static struct ib_qp *idr_read_qp(int qp_handle, struct ib_ucontext *context)
 236 {
 237         return idr_read_obj(&ib_uverbs_qp_idr, qp_handle, context, 0);
 238 }
 239
 240 static void put_qp_read(struct ib_qp *qp)
 241 {
 242         put_uobj_read(qp->uobject);
 243 }
 244
 245 static struct ib_srq *idr_read_srq(int srq_handle, struct ib_ucontext *context)
 246 {
 247         return idr_read_obj(&ib_uverbs_srq_idr, srq_handle, context, 0);
 248 }
 249
 250 static void put_srq_read(struct ib_srq *srq)
 251 {
 252         put_uobj_read(srq->uobject);
 253 }
 254
 255 ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
 256                               const char __user *buf,
 257                               int in_len, int out_len)
 258 {
 259         struct ib_uverbs_get_context      cmd;
 260         struct ib_uverbs_get_context_resp resp;
 261         struct ib_udata                   udata;
 262         struct ib_device                 *ibdev = file->device->ib_dev;
 263         struct ib_ucontext               *ucontext;
 264         struct file                      *filp;
 265         int ret;
 266
 267         if (out_len < sizeof resp)
 268                 return -ENOSPC;
 269
 270         if (copy_from_user(&cmd, buf, sizeof cmd))
 271                 return -EFAULT;
 272
 273         mutex_lock(&file->mutex);
 274
 275         if (file->ucontext) {
 276                 ret = -EINVAL;
 277                 goto err;
 278         }
 279
 280         INIT_UDATA(&udata, buf + sizeof cmd,
 281                    (unsigned long) cmd.response + sizeof resp,
 282                    in_len - sizeof cmd, out_len - sizeof resp);
 283
 284         ucontext = ibdev->alloc_ucontext(ibdev, &udata);
 285         if (IS_ERR(ucontext)) {
 286                 ret = PTR_ERR(file->ucontext);
 287                 goto err;
 288         }
 289
 290         ucontext->device = ibdev;
 291         INIT_LIST_HEAD(&ucontext->pd_list);
 292         INIT_LIST_HEAD(&ucontext->mr_list);
 293         INIT_LIST_HEAD(&ucontext->mw_list);
 294         INIT_LIST_HEAD(&ucontext->cq_list);
 295         INIT_LIST_HEAD(&ucontext->qp_list);
 296         INIT_LIST_HEAD(&ucontext->srq_list);
 297         INIT_LIST_HEAD(&ucontext->ah_list);
 298
 299         resp.num_comp_vectors = file->device->num_comp_vectors;
 300
 301         filp = ib_uverbs_alloc_event_file(file, 1, &resp.async_fd);
 302         if (IS_ERR(filp)) {
 303                 ret = PTR_ERR(filp);
 304                 goto err_free;
 305         }
 306
 307         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 308                          &resp, sizeof resp)) {
 309                 ret = -EFAULT;
 310                 goto err_file;
 311         }
 312
 313         file->async_file = filp->private_data;
 314
 315         INIT_IB_EVENT_HANDLER(&file->event_handler, file->device->ib_dev,
 316                               ib_uverbs_event_handler);
 317         ret = ib_register_event_handler(&file->event_handler);
 318         if (ret)
 319                 goto err_file;
 320
 321         kref_get(&file->async_file->ref);
 322         kref_get(&file->ref);
 323         file->ucontext = ucontext;
 324
 325         fd_install(resp.async_fd, filp);
 326
 327         mutex_unlock(&file->mutex);
 328
 329         return in_len;
 330
 331 err_file:
 332         put_unused_fd(resp.async_fd);
 333         fput(filp);
 334
 335 err_free:
 336         ibdev->dealloc_ucontext(ucontext);
 337
 338 err:
 339         mutex_unlock(&file->mutex);
 340         return ret;
 341 }
 342
 343 ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
 344                                const char __user *buf,
 345                                int in_len, int out_len)
 346 {
 347         struct ib_uverbs_query_device      cmd;
 348         struct ib_uverbs_query_device_resp resp;
 349         struct ib_device_attr              attr;
 350         int                                ret;
 351
 352         if (out_len < sizeof resp)
 353                 return -ENOSPC;
 354
 355         if (copy_from_user(&cmd, buf, sizeof cmd))
 356                 return -EFAULT;
 357
 358         ret = ib_query_device(file->device->ib_dev, &attr);
 359         if (ret)
 360                 return ret;
 361
 362         memset(&resp, 0, sizeof resp);
 363
 364         resp.fw_ver                    = attr.fw_ver;
 365         resp.node_guid                 = file->device->ib_dev->node_guid;
 366         resp.sys_image_guid            = attr.sys_image_guid;
 367         resp.max_mr_size               = attr.max_mr_size;
 368         resp.page_size_cap             = attr.page_size_cap;
 369         resp.vendor_id                 = attr.vendor_id;
 370         resp.vendor_part_id            = attr.vendor_part_id;
 371         resp.hw_ver                    = attr.hw_ver;
 372         resp.max_qp                    = attr.max_qp;
 373         resp.max_qp_wr                 = attr.max_qp_wr;
 374         resp.device_cap_flags          = attr.device_cap_flags;
 375         resp.max_sge                   = attr.max_sge;
 376         resp.max_sge_rd                = attr.max_sge_rd;
 377         resp.max_cq                    = attr.max_cq;
 378         resp.max_cqe                   = attr.max_cqe;
 379         resp.max_mr                    = attr.max_mr;
 380         resp.max_pd                    = attr.max_pd;
 381         resp.max_qp_rd_atom            = attr.max_qp_rd_atom;
 382         resp.max_ee_rd_atom            = attr.max_ee_rd_atom;
 383         resp.max_res_rd_atom           = attr.max_res_rd_atom;
 384         resp.max_qp_init_rd_atom       = attr.max_qp_init_rd_atom;
 385         resp.max_ee_init_rd_atom       = attr.max_ee_init_rd_atom;
 386         resp.atomic_cap                = attr.atomic_cap;
 387         resp.max_ee                    = attr.max_ee;
 388         resp.max_rdd                   = attr.max_rdd;
 389         resp.max_mw                    = attr.max_mw;
 390         resp.max_raw_ipv6_qp           = attr.max_raw_ipv6_qp;
 391         resp.max_raw_ethy_qp           = attr.max_raw_ethy_qp;
 392         resp.max_mcast_grp             = attr.max_mcast_grp;
 393         resp.max_mcast_qp_attach       = attr.max_mcast_qp_attach;
 394         resp.max_total_mcast_qp_attach = attr.max_total_mcast_qp_attach;
 395         resp.max_ah                    = attr.max_ah;
 396         resp.max_fmr                   = attr.max_fmr;
 397         resp.max_map_per_fmr           = attr.max_map_per_fmr;
 398         resp.max_srq                   = attr.max_srq;
 399         resp.max_srq_wr                = attr.max_srq_wr;
 400         resp.max_srq_sge               = attr.max_srq_sge;
 401         resp.max_pkeys                 = attr.max_pkeys;
 402         resp.local_ca_ack_delay        = attr.local_ca_ack_delay;
 403         resp.phys_port_cnt             = file->device->ib_dev->phys_port_cnt;
 404
 405         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 406                          &resp, sizeof resp))
 407                 return -EFAULT;
 408
 409         return in_len;
 410 }
 411
 412 ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
 413                              const char __user *buf,
 414                              int in_len, int out_len)
 415 {
 416         struct ib_uverbs_query_port      cmd;
 417         struct ib_uverbs_query_port_resp resp;
 418         struct ib_port_attr              attr;
 419         int                              ret;
 420
 421         if (out_len < sizeof resp)
 422                 return -ENOSPC;
 423
 424         if (copy_from_user(&cmd, buf, sizeof cmd))
 425                 return -EFAULT;
 426
 427         ret = ib_query_port(file->device->ib_dev, cmd.port_num, &attr);
 428         if (ret)
 429                 return ret;
 430
 431         memset(&resp, 0, sizeof resp);
 432
 433         resp.state           = attr.state;
 434         resp.max_mtu         = attr.max_mtu;
 435         resp.active_mtu      = attr.active_mtu;
 436         resp.gid_tbl_len     = attr.gid_tbl_len;
 437         resp.port_cap_flags  = attr.port_cap_flags;
 438         resp.max_msg_sz      = attr.max_msg_sz;
 439         resp.bad_pkey_cntr   = attr.bad_pkey_cntr;
 440         resp.qkey_viol_cntr  = attr.qkey_viol_cntr;
 441         resp.pkey_tbl_len    = attr.pkey_tbl_len;
 442         resp.lid             = attr.lid;
 443         resp.sm_lid          = attr.sm_lid;
 444         resp.lmc             = attr.lmc;
 445         resp.max_vl_num      = attr.max_vl_num;
 446         resp.sm_sl           = attr.sm_sl;
 447         resp.subnet_timeout  = attr.subnet_timeout;
 448         resp.init_type_reply = attr.init_type_reply;
 449         resp.active_width    = attr.active_width;
 450         resp.active_speed    = attr.active_speed;
 451         resp.phys_state      = attr.phys_state;
 452
 453         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 454                          &resp, sizeof resp))
 455                 return -EFAULT;
 456
 457         return in_len;
 458 }
 459
 460 ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
 461                            const char __user *buf,
 462                            int in_len, int out_len)
 463 {
 464         struct ib_uverbs_alloc_pd      cmd;
 465         struct ib_uverbs_alloc_pd_resp resp;
 466         struct ib_udata                udata;
 467         struct ib_uobject             *uobj;
 468         struct ib_pd                  *pd;
 469         int                            ret;
 470
 471         if (out_len < sizeof resp)
 472                 return -ENOSPC;
 473
 474         if (copy_from_user(&cmd, buf, sizeof cmd))
 475                 return -EFAULT;
 476
 477         INIT_UDATA(&udata, buf + sizeof cmd,
 478                    (unsigned long) cmd.response + sizeof resp,
 479                    in_len - sizeof cmd, out_len - sizeof resp);
 480
 481         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
 482         if (!uobj)
 483                 return -ENOMEM;
 484
 485         init_uobj(uobj, 0, file->ucontext, &pd_lock_key);
 486         down_write(&uobj->mutex);
 487
 488         pd = file->device->ib_dev->alloc_pd(file->device->ib_dev,
 489                                             file->ucontext, &udata);
 490         if (IS_ERR(pd)) {
 491                 ret = PTR_ERR(pd);
 492                 goto err;
 493         }
 494
 495         pd->device  = file->device->ib_dev;
 496         pd->uobject = uobj;
 497         atomic_set(&pd->usecnt, 0);
 498
 499         uobj->object = pd;
 500         ret = idr_add_uobj(&ib_uverbs_pd_idr, uobj);
 501         if (ret)
 502                 goto err_idr;
 503
 504         memset(&resp, 0, sizeof resp);
 505         resp.pd_handle = uobj->id;
 506
 507         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 508                          &resp, sizeof resp)) {
 509                 ret = -EFAULT;
 510                 goto err_copy;
 511         }
 512
 513         mutex_lock(&file->mutex);
 514         list_add_tail(&uobj->list, &file->ucontext->pd_list);
 515         mutex_unlock(&file->mutex);
 516
 517         uobj->live = 1;
 518
 519         up_write(&uobj->mutex);
 520
 521         return in_len;
 522
 523 err_copy:
 524         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 525
 526 err_idr:
 527         ib_dealloc_pd(pd);
 528
 529 err:
 530         put_uobj_write(uobj);
 531         return ret;
 532 }
 533
 534 ssize_t ib_uverbs_dealloc_pd(struct ib_uverbs_file *file,
 535                              const char __user *buf,
 536                              int in_len, int out_len)
 537 {
 538         struct ib_uverbs_dealloc_pd cmd;
 539         struct ib_uobject          *uobj;
 540         int                         ret;
 541
 542         if (copy_from_user(&cmd, buf, sizeof cmd))
 543                 return -EFAULT;
 544
 545         uobj = idr_write_uobj(&ib_uverbs_pd_idr, cmd.pd_handle, file->ucontext);
 546         if (!uobj)
 547                 return -EINVAL;
 548
 549         ret = ib_dealloc_pd(uobj->object);
 550         if (!ret)
 551                 uobj->live = 0;
 552
 553         put_uobj_write(uobj);
 554
 555         if (ret)
 556                 return ret;
 557
 558         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 559
 560         mutex_lock(&file->mutex);
 561         list_del(&uobj->list);
 562         mutex_unlock(&file->mutex);
 563
 564         put_uobj(uobj);
 565
 566         return in_len;
 567 }
 568
 569 ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
 570                          const char __user *buf, int in_len,
 571                          int out_len)
 572 {
 573         struct ib_uverbs_reg_mr      cmd;
 574         struct ib_uverbs_reg_mr_resp resp;
 575         struct ib_udata              udata;
 576         struct ib_umem_object       *obj;
 577         struct ib_pd                *pd;
 578         struct ib_mr                *mr;
 579         int                          ret;
 580
 581         if (out_len < sizeof resp)
 582                 return -ENOSPC;
 583
 584         if (copy_from_user(&cmd, buf, sizeof cmd))
 585                 return -EFAULT;
 586
 587         INIT_UDATA(&udata, buf + sizeof cmd,
 588                    (unsigned long) cmd.response + sizeof resp,
 589                    in_len - sizeof cmd, out_len - sizeof resp);
 590
 591         if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))
 592                 return -EINVAL;
 593
 594         /*
 595          * Local write permission is required if remote write or
 596          * remote atomic permission is also requested.
 597          */
 598         if (cmd.access_flags & (IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_REMOTE_WRITE) &&
 599             !(cmd.access_flags & IB_ACCESS_LOCAL_WRITE))
 600                 return -EINVAL;
 601
 602         obj = kmalloc(sizeof *obj, GFP_KERNEL);
 603         if (!obj)
 604                 return -ENOMEM;
 605
 606         init_uobj(&obj->uobject, 0, file->ucontext, &mr_lock_key);
 607         down_write(&obj->uobject.mutex);
 608
 609         /*
 610          * We ask for writable memory if any access flags other than
 611          * "remote read" are set.  "Local write" and "remote write"
 612          * obviously require write access.  "Remote atomic" can do
 613          * things like fetch and add, which will modify memory, and
 614          * "MW bind" can change permissions by binding a window.
 615          */
 616         ret = ib_umem_get(file->device->ib_dev, &obj->umem,
 617                           (void *) (unsigned long) cmd.start, cmd.length,
 618                           !!(cmd.access_flags & ~IB_ACCESS_REMOTE_READ));
 619         if (ret)
 620                 goto err_free;
 621
 622         obj->umem.virt_base = cmd.hca_va;
 623
 624         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
 625         if (!pd) {
 626                 ret = -EINVAL;
 627                 goto err_release;
 628         }
 629
 630         mr = pd->device->reg_user_mr(pd, &obj->umem, cmd.access_flags, &udata);
 631         if (IS_ERR(mr)) {
 632                 ret = PTR_ERR(mr);
 633                 goto err_put;
 634         }
 635
 636         mr->device  = pd->device;
 637         mr->pd      = pd;
 638         mr->uobject = &obj->uobject;
 639         atomic_inc(&pd->usecnt);
 640         atomic_set(&mr->usecnt, 0);
 641
 642         obj->uobject.object = mr;
 643         ret = idr_add_uobj(&ib_uverbs_mr_idr, &obj->uobject);
 644         if (ret)
 645                 goto err_unreg;
 646
 647         memset(&resp, 0, sizeof resp);
 648         resp.lkey      = mr->lkey;
 649         resp.rkey      = mr->rkey;
 650         resp.mr_handle = obj->uobject.id;
 651
 652         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 653                          &resp, sizeof resp)) {
 654                 ret = -EFAULT;
 655                 goto err_copy;
 656         }
 657
 658         put_pd_read(pd);
 659
 660         mutex_lock(&file->mutex);
 661         list_add_tail(&obj->uobject.list, &file->ucontext->mr_list);
 662         mutex_unlock(&file->mutex);
 663
 664         obj->uobject.live = 1;
 665
 666         up_write(&obj->uobject.mutex);
 667
 668         return in_len;
 669
 670 err_copy:
 671         idr_remove_uobj(&ib_uverbs_mr_idr, &obj->uobject);
 672
 673 err_unreg:
 674         ib_dereg_mr(mr);
 675
 676 err_put:
 677         put_pd_read(pd);
 678
 679 err_release:
 680         ib_umem_release(file->device->ib_dev, &obj->umem);
 681
 682 err_free:
 683         put_uobj_write(&obj->uobject);
 684         return ret;
 685 }
 686
 687 ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
 688                            const char __user *buf, int in_len,
 689                            int out_len)
 690 {
 691         struct ib_uverbs_dereg_mr cmd;
 692         struct ib_mr             *mr;
 693         struct ib_uobject        *uobj;
 694         struct ib_umem_object    *memobj;
 695         int                       ret = -EINVAL;
 696
 697         if (copy_from_user(&cmd, buf, sizeof cmd))
 698                 return -EFAULT;
 699
 700         uobj = idr_write_uobj(&ib_uverbs_mr_idr, cmd.mr_handle, file->ucontext);
 701         if (!uobj)
 702                 return -EINVAL;
 703
 704         memobj = container_of(uobj, struct ib_umem_object, uobject);
 705         mr     = uobj->object;
 706
 707         ret = ib_dereg_mr(mr);
 708         if (!ret)
 709                 uobj->live = 0;
 710
 711         put_uobj_write(uobj);
 712
 713         if (ret)
 714                 return ret;
 715
 716         idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 717
 718         mutex_lock(&file->mutex);
 719         list_del(&uobj->list);
 720         mutex_unlock(&file->mutex);
 721
 722         ib_umem_release(file->device->ib_dev, &memobj->umem);
 723
 724         put_uobj(uobj);
 725
 726         return in_len;
 727 }
 728
 729 ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
 730                                       const char __user *buf, int in_len,
 731                                       int out_len)
 732 {
 733         struct ib_uverbs_create_comp_channel       cmd;
 734         struct ib_uverbs_create_comp_channel_resp  resp;
 735         struct file                               *filp;
 736
 737         if (out_len < sizeof resp)
 738                 return -ENOSPC;
 739
 740         if (copy_from_user(&cmd, buf, sizeof cmd))
 741                 return -EFAULT;
 742
 743         filp = ib_uverbs_alloc_event_file(file, 0, &resp.fd);
 744         if (IS_ERR(filp))
 745                 return PTR_ERR(filp);
 746
 747         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 748                          &resp, sizeof resp)) {
 749                 put_unused_fd(resp.fd);
 750                 fput(filp);
 751                 return -EFAULT;
 752         }
 753
 754         fd_install(resp.fd, filp);
 755         return in_len;
 756 }
 757
 758 ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
 759                             const char __user *buf, int in_len,
 760                             int out_len)
 761 {
 762         struct ib_uverbs_create_cq      cmd;
 763         struct ib_uverbs_create_cq_resp resp;
 764         struct ib_udata                 udata;
 765         struct ib_ucq_object           *obj;
 766         struct ib_uverbs_event_file    *ev_file = NULL;
 767         struct ib_cq                   *cq;
 768         int                             ret;
 769
 770         if (out_len < sizeof resp)
 771                 return -ENOSPC;
 772
 773         if (copy_from_user(&cmd, buf, sizeof cmd))
 774                 return -EFAULT;
 775
 776         INIT_UDATA(&udata, buf + sizeof cmd,
 777                    (unsigned long) cmd.response + sizeof resp,
 778                    in_len - sizeof cmd, out_len - sizeof resp);
 779
 780         if (cmd.comp_vector >= file->device->num_comp_vectors)
 781                 return -EINVAL;
 782
 783         obj = kmalloc(sizeof *obj, GFP_KERNEL);
 784         if (!obj)
 785                 return -ENOMEM;
 786
 787         init_uobj(&obj->uobject, cmd.user_handle, file->ucontext, &cq_lock_key);
 788         down_write(&obj->uobject.mutex);
 789
 790         if (cmd.comp_channel >= 0) {
 791                 ev_file = ib_uverbs_lookup_comp_file(cmd.comp_channel);
 792                 if (!ev_file) {
 793                         ret = -EINVAL;
 794                         goto err;
 795                 }
 796         }
 797
 798         obj->uverbs_file           = file;
 799         obj->comp_events_reported  = 0;
 800         obj->async_events_reported = 0;
 801         INIT_LIST_HEAD(&obj->comp_list);
 802         INIT_LIST_HEAD(&obj->async_list);
 803
 804         cq = file->device->ib_dev->create_cq(file->device->ib_dev, cmd.cqe,
 805                                              cmd.comp_vector,
 806                                              file->ucontext, &udata);
 807         if (IS_ERR(cq)) {
 808                 ret = PTR_ERR(cq);
 809                 goto err_file;
 810         }
 811
 812         cq->device        = file->device->ib_dev;
 813         cq->uobject       = &obj->uobject;
 814         cq->comp_handler  = ib_uverbs_comp_handler;
 815         cq->event_handler = ib_uverbs_cq_event_handler;
 816         cq->cq_context    = ev_file;
 817         atomic_set(&cq->usecnt, 0);
 818
 819         obj->uobject.object = cq;
 820         ret = idr_add_uobj(&ib_uverbs_cq_idr, &obj->uobject);
 821         if (ret)
 822                 goto err_free;
 823
 824         memset(&resp, 0, sizeof resp);
 825         resp.cq_handle = obj->uobject.id;
 826         resp.cqe       = cq->cqe;
 827
 828         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 829                          &resp, sizeof resp)) {
 830                 ret = -EFAULT;
 831                 goto err_copy;
 832         }
 833
 834         mutex_lock(&file->mutex);
 835         list_add_tail(&obj->uobject.list, &file->ucontext->cq_list);
 836         mutex_unlock(&file->mutex);
 837
 838         obj->uobject.live = 1;
 839
 840         up_write(&obj->uobject.mutex);
 841
 842         return in_len;
 843
 844 err_copy:
 845         idr_remove_uobj(&ib_uverbs_cq_idr, &obj->uobject);
 846
 847 err_free:
 848         ib_destroy_cq(cq);
 849
 850 err_file:
 851         if (ev_file)
 852                 ib_uverbs_release_ucq(file, ev_file, obj);
 853
 854 err:
 855         put_uobj_write(&obj->uobject);
 856         return ret;
 857 }
 858
 859 ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
 860                             const char __user *buf, int in_len,
 861                             int out_len)
 862 {
 863         struct ib_uverbs_resize_cq      cmd;
 864         struct ib_uverbs_resize_cq_resp resp;
 865         struct ib_udata                 udata;
 866         struct ib_cq                    *cq;
 867         int                             ret = -EINVAL;
 868
 869         if (copy_from_user(&cmd, buf, sizeof cmd))
 870                 return -EFAULT;
 871
 872         INIT_UDATA(&udata, buf + sizeof cmd,
 873                    (unsigned long) cmd.response + sizeof resp,
 874                    in_len - sizeof cmd, out_len - sizeof resp);
 875
 876         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
 877         if (!cq)
 878                 return -EINVAL;
 879
 880         ret = cq->device->resize_cq(cq, cmd.cqe, &udata);
 881         if (ret)
 882                 goto out;
 883
 884         resp.cqe = cq->cqe;
 885
 886         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 887                          &resp, sizeof resp.cqe))
 888                 ret = -EFAULT;
 889
 890 out:
 891         put_cq_read(cq);
 892
 893         return ret ? ret : in_len;
 894 }
 895
 896 ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
 897                           const char __user *buf, int in_len,
 898                           int out_len)
 899 {
 900         struct ib_uverbs_poll_cq       cmd;
 901         struct ib_uverbs_poll_cq_resp *resp;
 902         struct ib_cq                  *cq;
 903         struct ib_wc                  *wc;
 904         int                            ret = 0;
 905         int                            i;
 906         int                            rsize;
 907
 908         if (copy_from_user(&cmd, buf, sizeof cmd))
 909                 return -EFAULT;
 910
 911         wc = kmalloc(cmd.ne * sizeof *wc, GFP_KERNEL);
 912         if (!wc)
 913                 return -ENOMEM;
 914
 915         rsize = sizeof *resp + cmd.ne * sizeof(struct ib_uverbs_wc);
 916         resp = kmalloc(rsize, GFP_KERNEL);
 917         if (!resp) {
 918                 ret = -ENOMEM;
 919                 goto out_wc;
 920         }
 921
 922         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
 923         if (!cq) {
 924                 ret = -EINVAL;
 925                 goto out;
 926         }
 927
 928         resp->count = ib_poll_cq(cq, cmd.ne, wc);
 929
 930         put_cq_read(cq);
 931
 932         for (i = 0; i < resp->count; i++) {
 933                 resp->wc[i].wr_id          = wc[i].wr_id;
 934                 resp->wc[i].status         = wc[i].status;
 935                 resp->wc[i].opcode         = wc[i].opcode;
 936                 resp->wc[i].vendor_err     = wc[i].vendor_err;
 937                 resp->wc[i].byte_len       = wc[i].byte_len;
 938                 resp->wc[i].imm_data       = (__u32 __force) wc[i].imm_data;
 939                 resp->wc[i].qp_num         = wc[i].qp->qp_num;
 940                 resp->wc[i].src_qp         = wc[i].src_qp;
 941                 resp->wc[i].wc_flags       = wc[i].wc_flags;
 942                 resp->wc[i].pkey_index     = wc[i].pkey_index;
 943                 resp->wc[i].slid           = wc[i].slid;
 944                 resp->wc[i].sl             = wc[i].sl;
 945                 resp->wc[i].dlid_path_bits = wc[i].dlid_path_bits;
 946                 resp->wc[i].port_num       = wc[i].port_num;
 947         }
 948
 949         if (copy_to_user((void __user *) (unsigned long) cmd.response, resp, rsize))
 950                 ret = -EFAULT;
 951
 952 out:
 953         kfree(resp);
 954
 955 out_wc:
 956         kfree(wc);
 957         return ret ? ret : in_len;
 958 }
 959
 960 ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file,
 961                                 const char __user *buf, int in_len,
 962                                 int out_len)
 963 {
 964         struct ib_uverbs_req_notify_cq cmd;
 965         struct ib_cq                  *cq;
 966
 967         if (copy_from_user(&cmd, buf, sizeof cmd))
 968                 return -EFAULT;
 969
 970         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
 971         if (!cq)
 972                 return -EINVAL;
 973
 974         ib_req_notify_cq(cq, cmd.solicited_only ?
 975                          IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
 976
 977         put_cq_read(cq);
 978
 979         return in_len;
 980 }
 981
 982 ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
 983                              const char __user *buf, int in_len,
 984                              int out_len)
 985 {
 986         struct ib_uverbs_destroy_cq      cmd;
 987         struct ib_uverbs_destroy_cq_resp resp;
 988         struct ib_uobject               *uobj;
 989         struct ib_cq                    *cq;
 990         struct ib_ucq_object            *obj;
 991         struct ib_uverbs_event_file     *ev_file;
 992         int                              ret = -EINVAL;
 993
 994         if (copy_from_user(&cmd, buf, sizeof cmd))
 995                 return -EFAULT;
 996
 997         uobj = idr_write_uobj(&ib_uverbs_cq_idr, cmd.cq_handle, file->ucontext);
 998         if (!uobj)
 999                 return -EINVAL;
1000         cq      = uobj->object;
1001         ev_file = cq->cq_context;
1002         obj     = container_of(cq->uobject, struct ib_ucq_object, uobject);
1003
1004         ret = ib_destroy_cq(cq);
1005         if (!ret)
1006                 uobj->live = 0;
1007
1008         put_uobj_write(uobj);
1009
1010         if (ret)
1011                 return ret;
1012
1013         idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
1014
1015         mutex_lock(&file->mutex);
1016         list_del(&uobj->list);
1017         mutex_unlock(&file->mutex);
1018
1019         ib_uverbs_release_ucq(file, ev_file, obj);
1020
1021         memset(&resp, 0, sizeof resp);
1022         resp.comp_events_reported  = obj->comp_events_reported;
1023         resp.async_events_reported = obj->async_events_reported;
1024
1025         put_uobj(uobj);
1026
1027         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1028                          &resp, sizeof resp))
1029                 return -EFAULT;
1030
1031         return in_len;
1032 }
1033
1034 ssize_t ib_uverbs_create_qp(struct ib_uverbs_file *file,
1035                             const char __user *buf, int in_len,
1036                             int out_len)
1037 {
1038         struct ib_uverbs_create_qp      cmd;
1039         struct ib_uverbs_create_qp_resp resp;
1040         struct ib_udata                 udata;
1041         struct ib_uqp_object           *obj;
1042         struct ib_pd                   *pd;
1043         struct ib_cq                   *scq, *rcq;
1044         struct ib_srq                  *srq;
1045         struct ib_qp                   *qp;
1046         struct ib_qp_init_attr          attr;
1047         int ret;
1048
1049         if (out_len < sizeof resp)
1050                 return -ENOSPC;
1051
1052         if (copy_from_user(&cmd, buf, sizeof cmd))
1053                 return -EFAULT;
1054
1055         INIT_UDATA(&udata, buf + sizeof cmd,
1056                    (unsigned long) cmd.response + sizeof resp,
1057                    in_len - sizeof cmd, out_len - sizeof resp);
1058
1059         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1060         if (!obj)
1061                 return -ENOMEM;
1062
1063         init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_key);
1064         down_write(&obj->uevent.uobject.mutex);
1065
1066         srq = cmd.is_srq ? idr_read_srq(cmd.srq_handle, file->ucontext) : NULL;
1067         pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
1068         scq = idr_read_cq(cmd.send_cq_handle, file->ucontext, 0);
1069         rcq = cmd.recv_cq_handle == cmd.send_cq_handle ?
1070                 scq : idr_read_cq(cmd.recv_cq_handle, file->ucontext, 1);
1071
1072         if (!pd || !scq || !rcq || (cmd.is_srq && !srq)) {
1073                 ret = -EINVAL;
1074                 goto err_put;
1075         }
1076
1077         attr.event_handler = ib_uverbs_qp_event_handler;
1078         attr.qp_context    = file;
1079         attr.send_cq       = scq;
1080         attr.recv_cq       = rcq;
1081         attr.srq           = srq;
1082         attr.sq_sig_type   = cmd.sq_sig_all ? IB_SIGNAL_ALL_WR : IB_SIGNAL_REQ_WR;
1083         attr.qp_type       = cmd.qp_type;
1084
1085         attr.cap.max_send_wr     = cmd.max_send_wr;
1086         attr.cap.max_recv_wr     = cmd.max_recv_wr;
1087         attr.cap.max_send_sge    = cmd.max_send_sge;
1088         attr.cap.max_recv_sge    = cmd.max_recv_sge;
1089         attr.cap.max_inline_data = cmd.max_inline_data;
1090
1091         obj->uevent.events_reported     = 0;
1092         INIT_LIST_HEAD(&obj->uevent.event_list);
1093         INIT_LIST_HEAD(&obj->mcast_list);
1094
1095         qp = pd->device->create_qp(pd, &attr, &udata);
1096         if (IS_ERR(qp)) {
1097                 ret = PTR_ERR(qp);
1098                 goto err_put;
1099         }
1100
1101         qp->device        = pd->device;
1102         qp->pd            = pd;
1103         qp->send_cq       = attr.send_cq;
1104         qp->recv_cq       = attr.recv_cq;
1105         qp->srq           = attr.srq;
1106         qp->uobject       = &obj->uevent.uobject;
1107         qp->event_handler = attr.event_handler;
1108         qp->qp_context    = attr.qp_context;
1109         qp->qp_type       = attr.qp_type;
1110         atomic_inc(&pd->usecnt);
1111         atomic_inc(&attr.send_cq->usecnt);
1112         atomic_inc(&attr.recv_cq->usecnt);
1113         if (attr.srq)
1114                 atomic_inc(&attr.srq->usecnt);
1115
1116         obj->uevent.uobject.object = qp;
1117         ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1118         if (ret)
1119                 goto err_destroy;
1120
1121         memset(&resp, 0, sizeof resp);
1122         resp.qpn             = qp->qp_num;
1123         resp.qp_handle       = obj->uevent.uobject.id;
1124         resp.max_recv_sge    = attr.cap.max_recv_sge;
1125         resp.max_send_sge    = attr.cap.max_send_sge;
1126         resp.max_recv_wr     = attr.cap.max_recv_wr;
1127         resp.max_send_wr     = attr.cap.max_send_wr;
1128         resp.max_inline_data = attr.cap.max_inline_data;
1129
1130         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1131                          &resp, sizeof resp)) {
1132                 ret = -EFAULT;
1133                 goto err_copy;
1134         }
1135
1136         put_pd_read(pd);
1137         put_cq_read(scq);
1138         if (rcq != scq)
1139                 put_cq_read(rcq);
1140         if (srq)
1141                 put_srq_read(srq);
1142
1143         mutex_lock(&file->mutex);
1144         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1145         mutex_unlock(&file->mutex);
1146
1147         obj->uevent.uobject.live = 1;
1148
1149         up_write(&obj->uevent.uobject.mutex);
1150
1151         return in_len;
1152
1153 err_copy:
1154         idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1155
1156 err_destroy:
1157         ib_destroy_qp(qp);
1158
1159 err_put:
1160         if (pd)
1161                 put_pd_read(pd);
1162         if (scq)
1163                 put_cq_read(scq);
1164         if (rcq && rcq != scq)
1165                 put_cq_read(rcq);
1166         if (srq)
1167                 put_srq_read(srq);
1168
1169         put_uobj_write(&obj->uevent.uobject);
1170         return ret;
1171 }
1172
1173 ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
1174                            const char __user *buf, int in_len,
1175                            int out_len)
1176 {
1177         struct ib_uverbs_query_qp      cmd;
1178         struct ib_uverbs_query_qp_resp resp;
1179         struct ib_qp                   *qp;
1180         struct ib_qp_attr              *attr;
1181         struct ib_qp_init_attr         *init_attr;
1182         int                            ret;
1183
1184         if (copy_from_user(&cmd, buf, sizeof cmd))
1185                 return -EFAULT;
1186
1187         attr      = kmalloc(sizeof *attr, GFP_KERNEL);
1188         init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
1189         if (!attr || !init_attr) {
1190                 ret = -ENOMEM;
1191                 goto out;
1192         }
1193
1194         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1195         if (!qp) {
1196                 ret = -EINVAL;
1197                 goto out;
1198         }
1199
1200         ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
1201
1202         put_qp_read(qp);
1203
1204         if (ret)
1205                 goto out;
1206
1207         memset(&resp, 0, sizeof resp);
1208
1209         resp.qp_state               = attr->qp_state;
1210         resp.cur_qp_state           = attr->cur_qp_state;
1211         resp.path_mtu               = attr->path_mtu;
1212         resp.path_mig_state         = attr->path_mig_state;
1213         resp.qkey                   = attr->qkey;
1214         resp.rq_psn                 = attr->rq_psn;
1215         resp.sq_psn                 = attr->sq_psn;
1216         resp.dest_qp_num            = attr->dest_qp_num;
1217         resp.qp_access_flags        = attr->qp_access_flags;
1218         resp.pkey_index             = attr->pkey_index;
1219         resp.alt_pkey_index         = attr->alt_pkey_index;
1220         resp.sq_draining            = attr->sq_draining;
1221         resp.max_rd_atomic          = attr->max_rd_atomic;
1222         resp.max_dest_rd_atomic     = attr->max_dest_rd_atomic;
1223         resp.min_rnr_timer          = attr->min_rnr_timer;
1224         resp.port_num               = attr->port_num;
1225         resp.timeout                = attr->timeout;
1226         resp.retry_cnt              = attr->retry_cnt;
1227         resp.rnr_retry              = attr->rnr_retry;
1228         resp.alt_port_num           = attr->alt_port_num;
1229         resp.alt_timeout            = attr->alt_timeout;
1230
1231         memcpy(resp.dest.dgid, attr->ah_attr.grh.dgid.raw, 16);
1232         resp.dest.flow_label        = attr->ah_attr.grh.flow_label;
1233         resp.dest.sgid_index        = attr->ah_attr.grh.sgid_index;
1234         resp.dest.hop_limit         = attr->ah_attr.grh.hop_limit;
1235         resp.dest.traffic_class     = attr->ah_attr.grh.traffic_class;
1236         resp.dest.dlid              = attr->ah_attr.dlid;
1237         resp.dest.sl                = attr->ah_attr.sl;
1238         resp.dest.src_path_bits     = attr->ah_attr.src_path_bits;
1239         resp.dest.static_rate       = attr->ah_attr.static_rate;
1240         resp.dest.is_global         = !!(attr->ah_attr.ah_flags & IB_AH_GRH);
1241         resp.dest.port_num          = attr->ah_attr.port_num;
1242
1243         memcpy(resp.alt_dest.dgid, attr->alt_ah_attr.grh.dgid.raw, 16);
1244         resp.alt_dest.flow_label    = attr->alt_ah_attr.grh.flow_label;
1245         resp.alt_dest.sgid_index    = attr->alt_ah_attr.grh.sgid_index;
1246         resp.alt_dest.hop_limit     = attr->alt_ah_attr.grh.hop_limit;
1247         resp.alt_dest.traffic_class = attr->alt_ah_attr.grh.traffic_class;
1248         resp.alt_dest.dlid          = attr->alt_ah_attr.dlid;
1249         resp.alt_dest.sl            = attr->alt_ah_attr.sl;
1250         resp.alt_dest.src_path_bits = attr->alt_ah_attr.src_path_bits;
1251         resp.alt_dest.static_rate   = attr->alt_ah_attr.static_rate;
1252         resp.alt_dest.is_global     = !!(attr->alt_ah_attr.ah_flags & IB_AH_GRH);
1253         resp.alt_dest.port_num      = attr->alt_ah_attr.port_num;
1254
1255         resp.max_send_wr            = init_attr->cap.max_send_wr;
1256         resp.max_recv_wr            = init_attr->cap.max_recv_wr;
1257         resp.max_send_sge           = init_attr->cap.max_send_sge;
1258         resp.max_recv_sge           = init_attr->cap.max_recv_sge;
1259         resp.max_inline_data        = init_attr->cap.max_inline_data;
1260         resp.sq_sig_all             = init_attr->sq_sig_type == IB_SIGNAL_ALL_WR;
1261
1262         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1263                          &resp, sizeof resp))
1264                 ret = -EFAULT;
1265
1266 out:
1267         kfree(attr);
1268         kfree(init_attr);
1269
1270         return ret ? ret : in_len;
1271 }
1272
1273 ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file,
1274                             const char __user *buf, int in_len,
1275                             int out_len)
1276 {
1277         struct ib_uverbs_modify_qp cmd;
1278         struct ib_udata            udata;
1279         struct ib_qp              *qp;
1280         struct ib_qp_attr         *attr;
1281         int                        ret;
1282
1283         if (copy_from_user(&cmd, buf, sizeof cmd))
1284                 return -EFAULT;
1285
1286         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
1287                    out_len);
1288
1289         attr = kmalloc(sizeof *attr, GFP_KERNEL);
1290         if (!attr)
1291                 return -ENOMEM;
1292
1293         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1294         if (!qp) {
1295                 ret = -EINVAL;
1296                 goto out;
1297         }
1298
1299         attr->qp_state            = cmd.qp_state;
1300         attr->cur_qp_state        = cmd.cur_qp_state;
1301         attr->path_mtu            = cmd.path_mtu;
1302         attr->path_mig_state      = cmd.path_mig_state;
1303         attr->qkey                = cmd.qkey;
1304         attr->rq_psn              = cmd.rq_psn;
1305         attr->sq_psn              = cmd.sq_psn;
1306         attr->dest_qp_num         = cmd.dest_qp_num;
1307         attr->qp_access_flags     = cmd.qp_access_flags;
1308         attr->pkey_index          = cmd.pkey_index;
1309         attr->alt_pkey_index      = cmd.alt_pkey_index;
1310         attr->en_sqd_async_notify = cmd.en_sqd_async_notify;
1311         attr->max_rd_atomic       = cmd.max_rd_atomic;
1312         attr->max_dest_rd_atomic  = cmd.max_dest_rd_atomic;
1313         attr->min_rnr_timer       = cmd.min_rnr_timer;
1314         attr->port_num            = cmd.port_num;
1315         attr->timeout             = cmd.timeout;
1316         attr->retry_cnt           = cmd.retry_cnt;
1317         attr->rnr_retry           = cmd.rnr_retry;
1318         attr->alt_port_num        = cmd.alt_port_num;
1319         attr->alt_timeout         = cmd.alt_timeout;
1320
1321         memcpy(attr->ah_attr.grh.dgid.raw, cmd.dest.dgid, 16);
1322         attr->ah_attr.grh.flow_label        = cmd.dest.flow_label;
1323         attr->ah_attr.grh.sgid_index        = cmd.dest.sgid_index;
1324         attr->ah_attr.grh.hop_limit         = cmd.dest.hop_limit;
1325         attr->ah_attr.grh.traffic_class     = cmd.dest.traffic_class;
1326         attr->ah_attr.dlid                  = cmd.dest.dlid;
1327         attr->ah_attr.sl                    = cmd.dest.sl;
1328         attr->ah_attr.src_path_bits         = cmd.dest.src_path_bits;
1329         attr->ah_attr.static_rate           = cmd.dest.static_rate;
1330         attr->ah_attr.ah_flags              = cmd.dest.is_global ? IB_AH_GRH : 0;
1331         attr->ah_attr.port_num              = cmd.dest.port_num;
1332
1333         memcpy(attr->alt_ah_attr.grh.dgid.raw, cmd.alt_dest.dgid, 16);
1334         attr->alt_ah_attr.grh.flow_label    = cmd.alt_dest.flow_label;
1335         attr->alt_ah_attr.grh.sgid_index    = cmd.alt_dest.sgid_index;
1336         attr->alt_ah_attr.grh.hop_limit     = cmd.alt_dest.hop_limit;
1337         attr->alt_ah_attr.grh.traffic_class = cmd.alt_dest.traffic_class;
1338         attr->alt_ah_attr.dlid              = cmd.alt_dest.dlid;
1339         attr->alt_ah_attr.sl                = cmd.alt_dest.sl;
1340         attr->alt_ah_attr.src_path_bits     = cmd.alt_dest.src_path_bits;
1341         attr->alt_ah_attr.static_rate       = cmd.alt_dest.static_rate;
1342         attr->alt_ah_attr.ah_flags          = cmd.alt_dest.is_global ? IB_AH_GRH : 0;
1343         attr->alt_ah_attr.port_num          = cmd.alt_dest.port_num;
1344
1345         ret = qp->device->modify_qp(qp, attr, cmd.attr_mask, &udata);
1346
1347         put_qp_read(qp);
1348
1349         if (ret)
1350                 goto out;
1351
1352         ret = in_len;
1353
1354 out:
1355         kfree(attr);
1356
1357         return ret;
1358 }
1359
1360 ssize_t ib_uverbs_destroy_qp(struct ib_uverbs_file *file,
1361                              const char __user *buf, int in_len,
1362                              int out_len)
1363 {
1364         struct ib_uverbs_destroy_qp      cmd;
1365         struct ib_uverbs_destroy_qp_resp resp;
1366         struct ib_uobject               *uobj;
1367         struct ib_qp                    *qp;
1368         struct ib_uqp_object            *obj;
1369         int                              ret = -EINVAL;
1370
1371         if (copy_from_user(&cmd, buf, sizeof cmd))
1372                 return -EFAULT;
1373
1374         memset(&resp, 0, sizeof resp);
1375
1376         uobj = idr_write_uobj(&ib_uverbs_qp_idr, cmd.qp_handle, file->ucontext);
1377         if (!uobj)
1378                 return -EINVAL;
1379         qp  = uobj->object;
1380         obj = container_of(uobj, struct ib_uqp_object, uevent.uobject);
1381
1382         if (!list_empty(&obj->mcast_list)) {
1383                 put_uobj_write(uobj);
1384                 return -EBUSY;
1385         }
1386
1387         ret = ib_destroy_qp(qp);
1388         if (!ret)
1389                 uobj->live = 0;
1390
1391         put_uobj_write(uobj);
1392
1393         if (ret)
1394                 return ret;
1395
1396         idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
1397
1398         mutex_lock(&file->mutex);
1399         list_del(&uobj->list);
1400         mutex_unlock(&file->mutex);
1401
1402         ib_uverbs_release_uevent(file, &obj->uevent);
1403
1404         resp.events_reported = obj->uevent.events_reported;
1405
1406         put_uobj(uobj);
1407
1408         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1409                          &resp, sizeof resp))
1410                 return -EFAULT;
1411
1412         return in_len;
1413 }
1414
1415 ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
1416                             const char __user *buf, int in_len,
1417                             int out_len)
1418 {
1419         struct ib_uverbs_post_send      cmd;
1420         struct ib_uverbs_post_send_resp resp;
1421         struct ib_uverbs_send_wr       *user_wr;
1422         struct ib_send_wr              *wr = NULL, *last, *next, *bad_wr;
1423         struct ib_qp                   *qp;
1424         int                             i, sg_ind;
1425         int                             is_ud;
1426         ssize_t                         ret = -EINVAL;
1427
1428         if (copy_from_user(&cmd, buf, sizeof cmd))
1429                 return -EFAULT;
1430
1431         if (in_len < sizeof cmd + cmd.wqe_size * cmd.wr_count +
1432             cmd.sge_count * sizeof (struct ib_uverbs_sge))
1433                 return -EINVAL;
1434
1435         if (cmd.wqe_size < sizeof (struct ib_uverbs_send_wr))
1436                 return -EINVAL;
1437
1438         user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL);
1439         if (!user_wr)
1440                 return -ENOMEM;
1441
1442         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1443         if (!qp)
1444                 goto out;
1445
1446         is_ud = qp->qp_type == IB_QPT_UD;
1447         sg_ind = 0;
1448         last = NULL;
1449         for (i = 0; i < cmd.wr_count; ++i) {
1450                 if (copy_from_user(user_wr,
1451                                    buf + sizeof cmd + i * cmd.wqe_size,
1452                                    cmd.wqe_size)) {
1453                         ret = -EFAULT;
1454                         goto out_put;
1455                 }
1456
1457                 if (user_wr->num_sge + sg_ind > cmd.sge_count) {
1458                         ret = -EINVAL;
1459                         goto out_put;
1460                 }
1461
1462                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
1463                                user_wr->num_sge * sizeof (struct ib_sge),
1464                                GFP_KERNEL);
1465                 if (!next) {
1466                         ret = -ENOMEM;
1467                         goto out_put;
1468                 }
1469
1470                 if (!last)
1471                         wr = next;
1472                 else
1473                         last->next = next;
1474                 last = next;
1475
1476                 next->next       = NULL;
1477                 next->wr_id      = user_wr->wr_id;
1478                 next->num_sge    = user_wr->num_sge;
1479                 next->opcode     = user_wr->opcode;
1480                 next->send_flags = user_wr->send_flags;
1481                 next->imm_data   = (__be32 __force) user_wr->imm_data;
1482
1483                 if (is_ud) {
1484                         next->wr.ud.ah = idr_read_ah(user_wr->wr.ud.ah,
1485                                                      file->ucontext);
1486                         if (!next->wr.ud.ah) {
1487                                 ret = -EINVAL;
1488                                 goto out_put;
1489                         }
1490                         next->wr.ud.remote_qpn  = user_wr->wr.ud.remote_qpn;
1491                         next->wr.ud.remote_qkey = user_wr->wr.ud.remote_qkey;
1492                 } else {
1493                         switch (next->opcode) {
1494                         case IB_WR_RDMA_WRITE:
1495                         case IB_WR_RDMA_WRITE_WITH_IMM:
1496                         case IB_WR_RDMA_READ:
1497                                 next->wr.rdma.remote_addr =
1498                                         user_wr->wr.rdma.remote_addr;
1499                                 next->wr.rdma.rkey        =
1500                                         user_wr->wr.rdma.rkey;
1501                                 break;
1502                         case IB_WR_ATOMIC_CMP_AND_SWP:
1503                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1504                                 next->wr.atomic.remote_addr =
1505                                         user_wr->wr.atomic.remote_addr;
1506                                 next->wr.atomic.compare_add =
1507                                         user_wr->wr.atomic.compare_add;
1508                                 next->wr.atomic.swap = user_wr->wr.atomic.swap;
1509                                 next->wr.atomic.rkey = user_wr->wr.atomic.rkey;
1510                                 break;
1511                         default:
1512                                 break;
1513                         }
1514                 }
1515
1516                 if (next->num_sge) {
1517                         next->sg_list = (void *) next +
1518                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
1519                         if (copy_from_user(next->sg_list,
1520                                            buf + sizeof cmd +
1521                                            cmd.wr_count * cmd.wqe_size +
1522                                            sg_ind * sizeof (struct ib_sge),
1523                                            next->num_sge * sizeof (struct ib_sge))) {
1524                                 ret = -EFAULT;
1525                                 goto out_put;
1526                         }
1527                         sg_ind += next->num_sge;
1528                 } else
1529                         next->sg_list = NULL;
1530         }
1531
1532         resp.bad_wr = 0;
1533         ret = qp->device->post_send(qp, wr, &bad_wr);
1534         if (ret)
1535                 for (next = wr; next; next = next->next) {
1536                         ++resp.bad_wr;
1537                         if (next == bad_wr)
1538                                 break;
1539                 }
1540
1541         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1542                          &resp, sizeof resp))
1543                 ret = -EFAULT;
1544
1545 out_put:
1546         put_qp_read(qp);
1547
1548         while (wr) {
1549                 if (is_ud && wr->wr.ud.ah)
1550                         put_ah_read(wr->wr.ud.ah);
1551                 next = wr->next;
1552                 kfree(wr);
1553                 wr = next;
1554         }
1555
1556 out:
1557         kfree(user_wr);
1558
1559         return ret ? ret : in_len;
1560 }
1561
1562 static struct ib_recv_wr *ib_uverbs_unmarshall_recv(const char __user *buf,
1563                                                     int in_len,
1564                                                     u32 wr_count,
1565                                                     u32 sge_count,
1566                                                     u32 wqe_size)
1567 {
1568         struct ib_uverbs_recv_wr *user_wr;
1569         struct ib_recv_wr        *wr = NULL, *last, *next;
1570         int                       sg_ind;
1571         int                       i;
1572         int                       ret;
1573
1574         if (in_len < wqe_size * wr_count +
1575             sge_count * sizeof (struct ib_uverbs_sge))
1576                 return ERR_PTR(-EINVAL);
1577
1578         if (wqe_size < sizeof (struct ib_uverbs_recv_wr))
1579                 return ERR_PTR(-EINVAL);
1580
1581         user_wr = kmalloc(wqe_size, GFP_KERNEL);
1582         if (!user_wr)
1583                 return ERR_PTR(-ENOMEM);
1584
1585         sg_ind = 0;
1586         last = NULL;
1587         for (i = 0; i < wr_count; ++i) {
1588                 if (copy_from_user(user_wr, buf + i * wqe_size,
1589                                    wqe_size)) {
1590                         ret = -EFAULT;
1591                         goto err;
1592                 }
1593
1594                 if (user_wr->num_sge + sg_ind > sge_count) {
1595                         ret = -EINVAL;
1596                         goto err;
1597                 }
1598
1599                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
1600                                user_wr->num_sge * sizeof (struct ib_sge),
1601                                GFP_KERNEL);
1602                 if (!next) {
1603                         ret = -ENOMEM;
1604                         goto err;
1605                 }
1606
1607                 if (!last)
1608                         wr = next;
1609                 else
1610                         last->next = next;
1611                 last = next;
1612
1613                 next->next       = NULL;
1614                 next->wr_id      = user_wr->wr_id;
1615                 next->num_sge    = user_wr->num_sge;
1616
1617                 if (next->num_sge) {
1618                         next->sg_list = (void *) next +
1619                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
1620                         if (copy_from_user(next->sg_list,
1621                                            buf + wr_count * wqe_size +
1622                                            sg_ind * sizeof (struct ib_sge),
1623                                            next->num_sge * sizeof (struct ib_sge))) {
1624                                 ret = -EFAULT;
1625                                 goto err;
1626                         }
1627                         sg_ind += next->num_sge;
1628                 } else
1629                         next->sg_list = NULL;
1630         }
1631
1632         kfree(user_wr);
1633         return wr;
1634
1635 err:
1636         kfree(user_wr);
1637
1638         while (wr) {
1639                 next = wr->next;
1640                 kfree(wr);
1641                 wr = next;
1642         }
1643
1644         return ERR_PTR(ret);
1645 }
1646
1647 ssize_t ib_uverbs_post_recv(struct ib_uverbs_file *file,
1648                             const char __user *buf, int in_len,
1649                             int out_len)
1650 {
1651         struct ib_uverbs_post_recv      cmd;
1652         struct ib_uverbs_post_recv_resp resp;
1653         struct ib_recv_wr              *wr, *next, *bad_wr;
1654         struct ib_qp                   *qp;
1655         ssize_t                         ret = -EINVAL;
1656
1657         if (copy_from_user(&cmd, buf, sizeof cmd))
1658                 return -EFAULT;
1659
1660         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
1661                                        in_len - sizeof cmd, cmd.wr_count,
1662                                        cmd.sge_count, cmd.wqe_size);
1663         if (IS_ERR(wr))
1664                 return PTR_ERR(wr);
1665
1666         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1667         if (!qp)
1668                 goto out;
1669
1670         resp.bad_wr = 0;
1671         ret = qp->device->post_recv(qp, wr, &bad_wr);
1672
1673         put_qp_read(qp);
1674
1675         if (ret)
1676                 for (next = wr; next; next = next->next) {
1677                         ++resp.bad_wr;
1678                         if (next == bad_wr)
1679                                 break;
1680                 }
1681
1682         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1683                          &resp, sizeof resp))
1684                 ret = -EFAULT;
1685
1686 out:
1687         while (wr) {
1688                 next = wr->next;
1689                 kfree(wr);
1690                 wr = next;
1691         }
1692
1693         return ret ? ret : in_len;
1694 }
1695
1696 ssize_t ib_uverbs_post_srq_recv(struct ib_uverbs_file *file,
1697                                 const char __user *buf, int in_len,
1698                                 int out_len)
1699 {
1700         struct ib_uverbs_post_srq_recv      cmd;
1701         struct ib_uverbs_post_srq_recv_resp resp;
1702         struct ib_recv_wr                  *wr, *next, *bad_wr;
1703         struct ib_srq                      *srq;
1704         ssize_t                             ret = -EINVAL;
1705
1706         if (copy_from_user(&cmd, buf, sizeof cmd))
1707                 return -EFAULT;
1708
1709         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
1710                                        in_len - sizeof cmd, cmd.wr_count,
1711                                        cmd.sge_count, cmd.wqe_size);
1712         if (IS_ERR(wr))
1713                 return PTR_ERR(wr);
1714
1715         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
1716         if (!srq)
1717                 goto out;
1718
1719         resp.bad_wr = 0;
1720         ret = srq->device->post_srq_recv(srq, wr, &bad_wr);
1721
1722         put_srq_read(srq);
1723
1724         if (ret)
1725                 for (next = wr; next; next = next->next) {
1726                         ++resp.bad_wr;
1727                         if (next == bad_wr)
1728                                 break;
1729                 }
1730
1731         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1732                          &resp, sizeof resp))
1733                 ret = -EFAULT;
1734
1735 out:
1736         while (wr) {
1737                 next = wr->next;
1738                 kfree(wr);
1739                 wr = next;
1740         }
1741
1742         return ret ? ret : in_len;
1743 }
1744
1745 ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
1746                             const char __user *buf, int in_len,
1747                             int out_len)
1748 {
1749         struct ib_uverbs_create_ah       cmd;
1750         struct ib_uverbs_create_ah_resp  resp;
1751         struct ib_uobject               *uobj;
1752         struct ib_pd                    *pd;
1753         struct ib_ah                    *ah;
1754         struct ib_ah_attr               attr;
1755         int ret;
1756
1757         if (out_len < sizeof resp)
1758                 return -ENOSPC;
1759
1760         if (copy_from_user(&cmd, buf, sizeof cmd))
1761                 return -EFAULT;
1762
1763         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
1764         if (!uobj)
1765                 return -ENOMEM;
1766
1767         init_uobj(uobj, cmd.user_handle, file->ucontext, &ah_lock_key);
1768         down_write(&uobj->mutex);
1769
1770         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
1771         if (!pd) {
1772                 ret = -EINVAL;
1773                 goto err;
1774         }
1775
1776         attr.dlid              = cmd.attr.dlid;
1777         attr.sl                = cmd.attr.sl;
1778         attr.src_path_bits     = cmd.attr.src_path_bits;
1779         attr.static_rate       = cmd.attr.static_rate;
1780         attr.ah_flags          = cmd.attr.is_global ? IB_AH_GRH : 0;
1781         attr.port_num          = cmd.attr.port_num;
1782         attr.grh.flow_label    = cmd.attr.grh.flow_label;
1783         attr.grh.sgid_index    = cmd.attr.grh.sgid_index;
1784         attr.grh.hop_limit     = cmd.attr.grh.hop_limit;
1785         attr.grh.traffic_class = cmd.attr.grh.traffic_class;
1786         memcpy(attr.grh.dgid.raw, cmd.attr.grh.dgid, 16);
1787
1788         ah = ib_create_ah(pd, &attr);
1789         if (IS_ERR(ah)) {
1790                 ret = PTR_ERR(ah);
1791                 goto err_put;
1792         }
1793
1794         ah->uobject  = uobj;
1795         uobj->object = ah;
1796
1797         ret = idr_add_uobj(&ib_uverbs_ah_idr, uobj);
1798         if (ret)
1799                 goto err_destroy;
1800
1801         resp.ah_handle = uobj->id;
1802
1803         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1804                          &resp, sizeof resp)) {
1805                 ret = -EFAULT;
1806                 goto err_copy;
1807         }
1808
1809         put_pd_read(pd);
1810
1811         mutex_lock(&file->mutex);
1812         list_add_tail(&uobj->list, &file->ucontext->ah_list);
1813         mutex_unlock(&file->mutex);
1814
1815         uobj->live = 1;
1816
1817         up_write(&uobj->mutex);
1818
1819         return in_len;
1820
1821 err_copy:
1822         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
1823
1824 err_destroy:
1825         ib_destroy_ah(ah);
1826
1827 err_put:
1828         put_pd_read(pd);
1829
1830 err:
1831         put_uobj_write(uobj);
1832         return ret;
1833 }
1834
1835 ssize_t ib_uverbs_destroy_ah(struct ib_uverbs_file *file,
1836                              const char __user *buf, int in_len, int out_len)
1837 {
1838         struct ib_uverbs_destroy_ah cmd;
1839         struct ib_ah               *ah;
1840         struct ib_uobject          *uobj;
1841         int                         ret;
1842
1843         if (copy_from_user(&cmd, buf, sizeof cmd))
1844                 return -EFAULT;
1845
1846         uobj = idr_write_uobj(&ib_uverbs_ah_idr, cmd.ah_handle, file->ucontext);
1847         if (!uobj)
1848                 return -EINVAL;
1849         ah = uobj->object;
1850
1851         ret = ib_destroy_ah(ah);
1852         if (!ret)
1853                 uobj->live = 0;
1854
1855         put_uobj_write(uobj);
1856
1857         if (ret)
1858                 return ret;
1859
1860         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
1861
1862         mutex_lock(&file->mutex);
1863         list_del(&uobj->list);
1864         mutex_unlock(&file->mutex);
1865
1866         put_uobj(uobj);
1867
1868         return in_len;
1869 }
1870
1871 ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
1872                                const char __user *buf, int in_len,
1873                                int out_len)
1874 {
1875         struct ib_uverbs_attach_mcast cmd;
1876         struct ib_qp                 *qp;
1877         struct ib_uqp_object         *obj;
1878         struct ib_uverbs_mcast_entry *mcast;
1879         int                           ret;
1880
1881         if (copy_from_user(&cmd, buf, sizeof cmd))
1882                 return -EFAULT;
1883
1884         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1885         if (!qp)
1886                 return -EINVAL;
1887
1888         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
1889
1890         list_for_each_entry(mcast, &obj->mcast_list, list)
1891                 if (cmd.mlid == mcast->lid &&
1892                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
1893                         ret = 0;
1894                         goto out_put;
1895                 }
1896
1897         mcast = kmalloc(sizeof *mcast, GFP_KERNEL);
1898         if (!mcast) {
1899                 ret = -ENOMEM;
1900                 goto out_put;
1901         }
1902
1903         mcast->lid = cmd.mlid;
1904         memcpy(mcast->gid.raw, cmd.gid, sizeof mcast->gid.raw);
1905
1906         ret = ib_attach_mcast(qp, &mcast->gid, cmd.mlid);
1907         if (!ret)
1908                 list_add_tail(&mcast->list, &obj->mcast_list);
1909         else
1910                 kfree(mcast);
1911
1912 out_put:
1913         put_qp_read(qp);
1914
1915         return ret ? ret : in_len;
1916 }
1917
1918 ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
1919                                const char __user *buf, int in_len,
1920                                int out_len)
1921 {
1922         struct ib_uverbs_detach_mcast cmd;
1923         struct ib_uqp_object         *obj;
1924         struct ib_qp                 *qp;
1925         struct ib_uverbs_mcast_entry *mcast;
1926         int                           ret = -EINVAL;
1927
1928         if (copy_from_user(&cmd, buf, sizeof cmd))
1929                 return -EFAULT;
1930
1931         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1932         if (!qp)
1933                 return -EINVAL;
1934
1935         ret = ib_detach_mcast(qp, (union ib_gid *) cmd.gid, cmd.mlid);
1936         if (ret)
1937                 goto out_put;
1938
1939         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
1940
1941         list_for_each_entry(mcast, &obj->mcast_list, list)
1942                 if (cmd.mlid == mcast->lid &&
1943                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
1944                         list_del(&mcast->list);
1945                         kfree(mcast);
1946                         break;
1947                 }
1948
1949 out_put:
1950         put_qp_read(qp);
1951
1952         return ret ? ret : in_len;
1953 }
1954
1955 ssize_t ib_uverbs_create_srq(struct ib_uverbs_file *file,
1956                              const char __user *buf, int in_len,
1957                              int out_len)
1958 {
1959         struct ib_uverbs_create_srq      cmd;
1960         struct ib_uverbs_create_srq_resp resp;
1961         struct ib_udata                  udata;
1962         struct ib_uevent_object         *obj;
1963         struct ib_pd                    *pd;
1964         struct ib_srq                   *srq;
1965         struct ib_srq_init_attr          attr;
1966         int ret;
1967
1968         if (out_len < sizeof resp)
1969                 return -ENOSPC;
1970
1971         if (copy_from_user(&cmd, buf, sizeof cmd))
1972                 return -EFAULT;
1973
1974         INIT_UDATA(&udata, buf + sizeof cmd,
1975                    (unsigned long) cmd.response + sizeof resp,
1976                    in_len - sizeof cmd, out_len - sizeof resp);
1977
1978         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1979         if (!obj)
1980                 return -ENOMEM;
1981
1982         init_uobj(&obj->uobject, cmd.user_handle, file->ucontext, &srq_lock_key);
1983         down_write(&obj->uobject.mutex);
1984
1985         pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
1986         if (!pd) {
1987                 ret = -EINVAL;
1988                 goto err;
1989         }
1990
1991         attr.event_handler  = ib_uverbs_srq_event_handler;
1992         attr.srq_context    = file;
1993         attr.attr.max_wr    = cmd.max_wr;
1994         attr.attr.max_sge   = cmd.max_sge;
1995         attr.attr.srq_limit = cmd.srq_limit;
1996
1997         obj->events_reported     = 0;
1998         INIT_LIST_HEAD(&obj->event_list);
1999
2000         srq = pd->device->create_srq(pd, &attr, &udata);
2001         if (IS_ERR(srq)) {
2002                 ret = PTR_ERR(srq);
2003                 goto err_put;
2004         }
2005
2006         srq->device        = pd->device;
2007         srq->pd            = pd;
2008         srq->uobject       = &obj->uobject;
2009         srq->event_handler = attr.event_handler;
2010         srq->srq_context   = attr.srq_context;
2011         atomic_inc(&pd->usecnt);
2012         atomic_set(&srq->usecnt, 0);
2013
2014         obj->uobject.object = srq;
2015         ret = idr_add_uobj(&ib_uverbs_srq_idr, &obj->uobject);
2016         if (ret)
2017                 goto err_destroy;
2018
2019         memset(&resp, 0, sizeof resp);
2020         resp.srq_handle = obj->uobject.id;
2021         resp.max_wr     = attr.attr.max_wr;
2022         resp.max_sge    = attr.attr.max_sge;
2023
2024         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2025                          &resp, sizeof resp)) {
2026                 ret = -EFAULT;
2027                 goto err_copy;
2028         }
2029
2030         put_pd_read(pd);
2031
2032         mutex_lock(&file->mutex);
2033         list_add_tail(&obj->uobject.list, &file->ucontext->srq_list);
2034         mutex_unlock(&file->mutex);
2035
2036         obj->uobject.live = 1;
2037
2038         up_write(&obj->uobject.mutex);
2039
2040         return in_len;
2041
2042 err_copy:
2043         idr_remove_uobj(&ib_uverbs_srq_idr, &obj->uobject);
2044
2045 err_destroy:
2046         ib_destroy_srq(srq);
2047
2048 err_put:
2049         put_pd_read(pd);
2050
2051 err:
2052         put_uobj_write(&obj->uobject);
2053         return ret;
2054 }
2055
2056 ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
2057                              const char __user *buf, int in_len,
2058                              int out_len)
2059 {
2060         struct ib_uverbs_modify_srq cmd;
2061         struct ib_udata             udata;
2062         struct ib_srq              *srq;
2063         struct ib_srq_attr          attr;
2064         int                         ret;
2065
2066         if (copy_from_user(&cmd, buf, sizeof cmd))
2067                 return -EFAULT;
2068
2069         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
2070                    out_len);
2071
2072         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2073         if (!srq)
2074                 return -EINVAL;
2075
2076         attr.max_wr    = cmd.max_wr;
2077         attr.srq_limit = cmd.srq_limit;
2078
2079         ret = srq->device->modify_srq(srq, &attr, cmd.attr_mask, &udata);
2080
2081         put_srq_read(srq);
2082
2083         return ret ? ret : in_len;
2084 }
2085
2086 ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
2087                             const char __user *buf,
2088                             int in_len, int out_len)
2089 {
2090         struct ib_uverbs_query_srq      cmd;
2091         struct ib_uverbs_query_srq_resp resp;
2092         struct ib_srq_attr              attr;
2093         struct ib_srq                   *srq;
2094         int                             ret;
2095
2096         if (out_len < sizeof resp)
2097                 return -ENOSPC;
2098
2099         if (copy_from_user(&cmd, buf, sizeof cmd))
2100                 return -EFAULT;
2101
2102         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2103         if (!srq)
2104                 return -EINVAL;
2105
2106         ret = ib_query_srq(srq, &attr);
2107
2108         put_srq_read(srq);
2109
2110         if (ret)
2111                 return ret;
2112
2113         memset(&resp, 0, sizeof resp);
2114
2115         resp.max_wr    = attr.max_wr;
2116         resp.max_sge   = attr.max_sge;
2117         resp.srq_limit = attr.srq_limit;
2118
2119         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2120                          &resp, sizeof resp))
2121                 return -EFAULT;
2122
2123         return in_len;
2124 }
2125
2126 ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
2127                               const char __user *buf, int in_len,
2128                               int out_len)
2129 {
2130         struct ib_uverbs_destroy_srq      cmd;
2131         struct ib_uverbs_destroy_srq_resp resp;
2132         struct ib_uobject                *uobj;
2133         struct ib_srq                    *srq;
2134         struct ib_uevent_object          *obj;
2135         int                               ret = -EINVAL;
2136
2137         if (copy_from_user(&cmd, buf, sizeof cmd))
2138                 return -EFAULT;
2139
2140         uobj = idr_write_uobj(&ib_uverbs_srq_idr, cmd.srq_handle, file->ucontext);
2141         if (!uobj)
2142                 return -EINVAL;
2143         srq = uobj->object;
2144         obj = container_of(uobj, struct ib_uevent_object, uobject);
2145
2146         ret = ib_destroy_srq(srq);
2147         if (!ret)
2148                 uobj->live = 0;
2149
2150         put_uobj_write(uobj);
2151
2152         if (ret)
2153                 return ret;
2154
2155         idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
2156
2157         mutex_lock(&file->mutex);
2158         list_del(&uobj->list);
2159         mutex_unlock(&file->mutex);
2160
2161         ib_uverbs_release_uevent(file, obj);
2162
2163         memset(&resp, 0, sizeof resp);
2164         resp.events_reported = obj->events_reported;
2165
2166         put_uobj(uobj);
2167
2168         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2169                          &resp, sizeof resp))
2170                 ret = -EFAULT;
2171
2172         return ret ? ret : in_len;
2173 }