drivers/infiniband/core/uverbs_cmd.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006, 2007 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 PathScale, Inc.  All rights reserved.
   5  * Copyright (c) 2006 Mellanox Technologies.  All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/file.h>
  37 #include <linux/fs.h>
  38 #include <linux/slab.h>
  39
  40 #include <asm/uaccess.h>
  41
  42 #include "uverbs.h"
  43
  44 static struct lock_class_key pd_lock_key;
  45 static struct lock_class_key mr_lock_key;
  46 static struct lock_class_key cq_lock_key;
  47 static struct lock_class_key qp_lock_key;
  48 static struct lock_class_key ah_lock_key;
  49 static struct lock_class_key srq_lock_key;
  50
  51 #define INIT_UDATA(udata, ibuf, obuf, ilen, olen)                       \
  52         do {                                                            \
  53                 (udata)->inbuf  = (void __user *) (ibuf);               \
  54                 (udata)->outbuf = (void __user *) (obuf);               \
  55                 (udata)->inlen  = (ilen);                               \
  56                 (udata)->outlen = (olen);                               \
  57         } while (0)
  58
  59 /*
  60  * The ib_uobject locking scheme is as follows:
  61  *
  62  * - ib_uverbs_idr_lock protects the uverbs idrs themselves, so it
  63  *   needs to be held during all idr operations.  When an object is
  64  *   looked up, a reference must be taken on the object's kref before
  65  *   dropping this lock.
  66  *
  67  * - Each object also has an rwsem.  This rwsem must be held for
  68  *   reading while an operation that uses the object is performed.
  69  *   For example, while registering an MR, the associated PD's
  70  *   uobject.mutex must be held for reading.  The rwsem must be held
  71  *   for writing while initializing or destroying an object.
  72  *
  73  * - In addition, each object has a "live" flag.  If this flag is not
  74  *   set, then lookups of the object will fail even if it is found in
  75  *   the idr.  This handles a reader that blocks and does not acquire
  76  *   the rwsem until after the object is destroyed.  The destroy
  77  *   operation will set the live flag to 0 and then drop the rwsem;
  78  *   this will allow the reader to acquire the rwsem, see that the
  79  *   live flag is 0, and then drop the rwsem and its reference to
  80  *   object.  The underlying storage will not be freed until the last
  81  *   reference to the object is dropped.
  82  */
  83
  84 static void init_uobj(struct ib_uobject *uobj, u64 user_handle,
  85                       struct ib_ucontext *context, struct lock_class_key *key)
  86 {
  87         uobj->user_handle = user_handle;
  88         uobj->context     = context;
  89         kref_init(&uobj->ref);
  90         init_rwsem(&uobj->mutex);
  91         lockdep_set_class(&uobj->mutex, key);
  92         uobj->live        = 0;
  93 }
  94
  95 static void release_uobj(struct kref *kref)
  96 {
  97         kfree(container_of(kref, struct ib_uobject, ref));
  98 }
  99
 100 static void put_uobj(struct ib_uobject *uobj)
 101 {
 102         kref_put(&uobj->ref, release_uobj);
 103 }
 104
 105 static void put_uobj_read(struct ib_uobject *uobj)
 106 {
 107         up_read(&uobj->mutex);
 108         put_uobj(uobj);
 109 }
 110
 111 static void put_uobj_write(struct ib_uobject *uobj)
 112 {
 113         up_write(&uobj->mutex);
 114         put_uobj(uobj);
 115 }
 116
 117 static int idr_add_uobj(struct idr *idr, struct ib_uobject *uobj)
 118 {
 119         int ret;
 120
 121 retry:
 122         if (!idr_pre_get(idr, GFP_KERNEL))
 123                 return -ENOMEM;
 124
 125         spin_lock(&ib_uverbs_idr_lock);
 126         ret = idr_get_new(idr, uobj, &uobj->id);
 127         spin_unlock(&ib_uverbs_idr_lock);
 128
 129         if (ret == -EAGAIN)
 130                 goto retry;
 131
 132         return ret;
 133 }
 134
 135 void idr_remove_uobj(struct idr *idr, struct ib_uobject *uobj)
 136 {
 137         spin_lock(&ib_uverbs_idr_lock);
 138         idr_remove(idr, uobj->id);
 139         spin_unlock(&ib_uverbs_idr_lock);
 140 }
 141
 142 static struct ib_uobject *__idr_get_uobj(struct idr *idr, int id,
 143                                          struct ib_ucontext *context)
 144 {
 145         struct ib_uobject *uobj;
 146
 147         spin_lock(&ib_uverbs_idr_lock);
 148         uobj = idr_find(idr, id);
 149         if (uobj) {
 150                 if (uobj->context == context)
 151                         kref_get(&uobj->ref);
 152                 else
 153                         uobj = NULL;
 154         }
 155         spin_unlock(&ib_uverbs_idr_lock);
 156
 157         return uobj;
 158 }
 159
 160 static struct ib_uobject *idr_read_uobj(struct idr *idr, int id,
 161                                         struct ib_ucontext *context, int nested)
 162 {
 163         struct ib_uobject *uobj;
 164
 165         uobj = __idr_get_uobj(idr, id, context);
 166         if (!uobj)
 167                 return NULL;
 168
 169         if (nested)
 170                 down_read_nested(&uobj->mutex, SINGLE_DEPTH_NESTING);
 171         else
 172                 down_read(&uobj->mutex);
 173         if (!uobj->live) {
 174                 put_uobj_read(uobj);
 175                 return NULL;
 176         }
 177
 178         return uobj;
 179 }
 180
 181 static struct ib_uobject *idr_write_uobj(struct idr *idr, int id,
 182                                          struct ib_ucontext *context)
 183 {
 184         struct ib_uobject *uobj;
 185
 186         uobj = __idr_get_uobj(idr, id, context);
 187         if (!uobj)
 188                 return NULL;
 189
 190         down_write(&uobj->mutex);
 191         if (!uobj->live) {
 192                 put_uobj_write(uobj);
 193                 return NULL;
 194         }
 195
 196         return uobj;
 197 }
 198
 199 static void *idr_read_obj(struct idr *idr, int id, struct ib_ucontext *context,
 200                           int nested)
 201 {
 202         struct ib_uobject *uobj;
 203
 204         uobj = idr_read_uobj(idr, id, context, nested);
 205         return uobj ? uobj->object : NULL;
 206 }
 207
 208 static struct ib_pd *idr_read_pd(int pd_handle, struct ib_ucontext *context)
 209 {
 210         return idr_read_obj(&ib_uverbs_pd_idr, pd_handle, context, 0);
 211 }
 212
 213 static void put_pd_read(struct ib_pd *pd)
 214 {
 215         put_uobj_read(pd->uobject);
 216 }
 217
 218 static struct ib_cq *idr_read_cq(int cq_handle, struct ib_ucontext *context, int nested)
 219 {
 220         return idr_read_obj(&ib_uverbs_cq_idr, cq_handle, context, nested);
 221 }
 222
 223 static void put_cq_read(struct ib_cq *cq)
 224 {
 225         put_uobj_read(cq->uobject);
 226 }
 227
 228 static struct ib_ah *idr_read_ah(int ah_handle, struct ib_ucontext *context)
 229 {
 230         return idr_read_obj(&ib_uverbs_ah_idr, ah_handle, context, 0);
 231 }
 232
 233 static void put_ah_read(struct ib_ah *ah)
 234 {
 235         put_uobj_read(ah->uobject);
 236 }
 237
 238 static struct ib_qp *idr_read_qp(int qp_handle, struct ib_ucontext *context)
 239 {
 240         return idr_read_obj(&ib_uverbs_qp_idr, qp_handle, context, 0);
 241 }
 242
 243 static void put_qp_read(struct ib_qp *qp)
 244 {
 245         put_uobj_read(qp->uobject);
 246 }
 247
 248 static struct ib_srq *idr_read_srq(int srq_handle, struct ib_ucontext *context)
 249 {
 250         return idr_read_obj(&ib_uverbs_srq_idr, srq_handle, context, 0);
 251 }
 252
 253 static void put_srq_read(struct ib_srq *srq)
 254 {
 255         put_uobj_read(srq->uobject);
 256 }
 257
 258 ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
 259                               const char __user *buf,
 260                               int in_len, int out_len)
 261 {
 262         struct ib_uverbs_get_context      cmd;
 263         struct ib_uverbs_get_context_resp resp;
 264         struct ib_udata                   udata;
 265         struct ib_device                 *ibdev = file->device->ib_dev;
 266         struct ib_ucontext               *ucontext;
 267         struct file                      *filp;
 268         int ret;
 269
 270         if (out_len < sizeof resp)
 271                 return -ENOSPC;
 272
 273         if (copy_from_user(&cmd, buf, sizeof cmd))
 274                 return -EFAULT;
 275
 276         mutex_lock(&file->mutex);
 277
 278         if (file->ucontext) {
 279                 ret = -EINVAL;
 280                 goto err;
 281         }
 282
 283         INIT_UDATA(&udata, buf + sizeof cmd,
 284                    (unsigned long) cmd.response + sizeof resp,
 285                    in_len - sizeof cmd, out_len - sizeof resp);
 286
 287         ucontext = ibdev->alloc_ucontext(ibdev, &udata);
 288         if (IS_ERR(ucontext)) {
 289                 ret = PTR_ERR(ucontext);
 290                 goto err;
 291         }
 292
 293         ucontext->device = ibdev;
 294         INIT_LIST_HEAD(&ucontext->pd_list);
 295         INIT_LIST_HEAD(&ucontext->mr_list);
 296         INIT_LIST_HEAD(&ucontext->mw_list);
 297         INIT_LIST_HEAD(&ucontext->cq_list);
 298         INIT_LIST_HEAD(&ucontext->qp_list);
 299         INIT_LIST_HEAD(&ucontext->srq_list);
 300         INIT_LIST_HEAD(&ucontext->ah_list);
 301         ucontext->closing = 0;
 302
 303         resp.num_comp_vectors = file->device->num_comp_vectors;
 304
 305         ret = get_unused_fd();
 306         if (ret < 0)
 307                 goto err_free;
 308         resp.async_fd = ret;
 309
 310         filp = ib_uverbs_alloc_event_file(file, 1);
 311         if (IS_ERR(filp)) {
 312                 ret = PTR_ERR(filp);
 313                 goto err_fd;
 314         }
 315
 316         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 317                          &resp, sizeof resp)) {
 318                 ret = -EFAULT;
 319                 goto err_file;
 320         }
 321
 322         file->async_file = filp->private_data;
 323
 324         INIT_IB_EVENT_HANDLER(&file->event_handler, file->device->ib_dev,
 325                               ib_uverbs_event_handler);
 326         ret = ib_register_event_handler(&file->event_handler);
 327         if (ret)
 328                 goto err_file;
 329
 330         kref_get(&file->async_file->ref);
 331         kref_get(&file->ref);
 332         file->ucontext = ucontext;
 333
 334         fd_install(resp.async_fd, filp);
 335
 336         mutex_unlock(&file->mutex);
 337
 338         return in_len;
 339
 340 err_file:
 341         fput(filp);
 342
 343 err_fd:
 344         put_unused_fd(resp.async_fd);
 345
 346 err_free:
 347         ibdev->dealloc_ucontext(ucontext);
 348
 349 err:
 350         mutex_unlock(&file->mutex);
 351         return ret;
 352 }
 353
 354 ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
 355                                const char __user *buf,
 356                                int in_len, int out_len)
 357 {
 358         struct ib_uverbs_query_device      cmd;
 359         struct ib_uverbs_query_device_resp resp;
 360         struct ib_device_attr              attr;
 361         int                                ret;
 362
 363         if (out_len < sizeof resp)
 364                 return -ENOSPC;
 365
 366         if (copy_from_user(&cmd, buf, sizeof cmd))
 367                 return -EFAULT;
 368
 369         ret = ib_query_device(file->device->ib_dev, &attr);
 370         if (ret)
 371                 return ret;
 372
 373         memset(&resp, 0, sizeof resp);
 374
 375         resp.fw_ver                    = attr.fw_ver;
 376         resp.node_guid                 = file->device->ib_dev->node_guid;
 377         resp.sys_image_guid            = attr.sys_image_guid;
 378         resp.max_mr_size               = attr.max_mr_size;
 379         resp.page_size_cap             = attr.page_size_cap;
 380         resp.vendor_id                 = attr.vendor_id;
 381         resp.vendor_part_id            = attr.vendor_part_id;
 382         resp.hw_ver                    = attr.hw_ver;
 383         resp.max_qp                    = attr.max_qp;
 384         resp.max_qp_wr                 = attr.max_qp_wr;
 385         resp.device_cap_flags          = attr.device_cap_flags;
 386         resp.max_sge                   = attr.max_sge;
 387         resp.max_sge_rd                = attr.max_sge_rd;
 388         resp.max_cq                    = attr.max_cq;
 389         resp.max_cqe                   = attr.max_cqe;
 390         resp.max_mr                    = attr.max_mr;
 391         resp.max_pd                    = attr.max_pd;
 392         resp.max_qp_rd_atom            = attr.max_qp_rd_atom;
 393         resp.max_ee_rd_atom            = attr.max_ee_rd_atom;
 394         resp.max_res_rd_atom           = attr.max_res_rd_atom;
 395         resp.max_qp_init_rd_atom       = attr.max_qp_init_rd_atom;
 396         resp.max_ee_init_rd_atom       = attr.max_ee_init_rd_atom;
 397         resp.atomic_cap                = attr.atomic_cap;
 398         resp.max_ee                    = attr.max_ee;
 399         resp.max_rdd                   = attr.max_rdd;
 400         resp.max_mw                    = attr.max_mw;
 401         resp.max_raw_ipv6_qp           = attr.max_raw_ipv6_qp;
 402         resp.max_raw_ethy_qp           = attr.max_raw_ethy_qp;
 403         resp.max_mcast_grp             = attr.max_mcast_grp;
 404         resp.max_mcast_qp_attach       = attr.max_mcast_qp_attach;
 405         resp.max_total_mcast_qp_attach = attr.max_total_mcast_qp_attach;
 406         resp.max_ah                    = attr.max_ah;
 407         resp.max_fmr                   = attr.max_fmr;
 408         resp.max_map_per_fmr           = attr.max_map_per_fmr;
 409         resp.max_srq                   = attr.max_srq;
 410         resp.max_srq_wr                = attr.max_srq_wr;
 411         resp.max_srq_sge               = attr.max_srq_sge;
 412         resp.max_pkeys                 = attr.max_pkeys;
 413         resp.local_ca_ack_delay        = attr.local_ca_ack_delay;
 414         resp.phys_port_cnt             = file->device->ib_dev->phys_port_cnt;
 415
 416         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 417                          &resp, sizeof resp))
 418                 return -EFAULT;
 419
 420         return in_len;
 421 }
 422
 423 ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
 424                              const char __user *buf,
 425                              int in_len, int out_len)
 426 {
 427         struct ib_uverbs_query_port      cmd;
 428         struct ib_uverbs_query_port_resp resp;
 429         struct ib_port_attr              attr;
 430         int                              ret;
 431
 432         if (out_len < sizeof resp)
 433                 return -ENOSPC;
 434
 435         if (copy_from_user(&cmd, buf, sizeof cmd))
 436                 return -EFAULT;
 437
 438         ret = ib_query_port(file->device->ib_dev, cmd.port_num, &attr);
 439         if (ret)
 440                 return ret;
 441
 442         memset(&resp, 0, sizeof resp);
 443
 444         resp.state           = attr.state;
 445         resp.max_mtu         = attr.max_mtu;
 446         resp.active_mtu      = attr.active_mtu;
 447         resp.gid_tbl_len     = attr.gid_tbl_len;
 448         resp.port_cap_flags  = attr.port_cap_flags;
 449         resp.max_msg_sz      = attr.max_msg_sz;
 450         resp.bad_pkey_cntr   = attr.bad_pkey_cntr;
 451         resp.qkey_viol_cntr  = attr.qkey_viol_cntr;
 452         resp.pkey_tbl_len    = attr.pkey_tbl_len;
 453         resp.lid             = attr.lid;
 454         resp.sm_lid          = attr.sm_lid;
 455         resp.lmc             = attr.lmc;
 456         resp.max_vl_num      = attr.max_vl_num;
 457         resp.sm_sl           = attr.sm_sl;
 458         resp.subnet_timeout  = attr.subnet_timeout;
 459         resp.init_type_reply = attr.init_type_reply;
 460         resp.active_width    = attr.active_width;
 461         resp.active_speed    = attr.active_speed;
 462         resp.phys_state      = attr.phys_state;
 463
 464         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 465                          &resp, sizeof resp))
 466                 return -EFAULT;
 467
 468         return in_len;
 469 }
 470
 471 ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
 472                            const char __user *buf,
 473                            int in_len, int out_len)
 474 {
 475         struct ib_uverbs_alloc_pd      cmd;
 476         struct ib_uverbs_alloc_pd_resp resp;
 477         struct ib_udata                udata;
 478         struct ib_uobject             *uobj;
 479         struct ib_pd                  *pd;
 480         int                            ret;
 481
 482         if (out_len < sizeof resp)
 483                 return -ENOSPC;
 484
 485         if (copy_from_user(&cmd, buf, sizeof cmd))
 486                 return -EFAULT;
 487
 488         INIT_UDATA(&udata, buf + sizeof cmd,
 489                    (unsigned long) cmd.response + sizeof resp,
 490                    in_len - sizeof cmd, out_len - sizeof resp);
 491
 492         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
 493         if (!uobj)
 494                 return -ENOMEM;
 495
 496         init_uobj(uobj, 0, file->ucontext, &pd_lock_key);
 497         down_write(&uobj->mutex);
 498
 499         pd = file->device->ib_dev->alloc_pd(file->device->ib_dev,
 500                                             file->ucontext, &udata);
 501         if (IS_ERR(pd)) {
 502                 ret = PTR_ERR(pd);
 503                 goto err;
 504         }
 505
 506         pd->device  = file->device->ib_dev;
 507         pd->uobject = uobj;
 508         atomic_set(&pd->usecnt, 0);
 509
 510         uobj->object = pd;
 511         ret = idr_add_uobj(&ib_uverbs_pd_idr, uobj);
 512         if (ret)
 513                 goto err_idr;
 514
 515         memset(&resp, 0, sizeof resp);
 516         resp.pd_handle = uobj->id;
 517
 518         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 519                          &resp, sizeof resp)) {
 520                 ret = -EFAULT;
 521                 goto err_copy;
 522         }
 523
 524         mutex_lock(&file->mutex);
 525         list_add_tail(&uobj->list, &file->ucontext->pd_list);
 526         mutex_unlock(&file->mutex);
 527
 528         uobj->live = 1;
 529
 530         up_write(&uobj->mutex);
 531
 532         return in_len;
 533
 534 err_copy:
 535         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 536
 537 err_idr:
 538         ib_dealloc_pd(pd);
 539
 540 err:
 541         put_uobj_write(uobj);
 542         return ret;
 543 }
 544
 545 ssize_t ib_uverbs_dealloc_pd(struct ib_uverbs_file *file,
 546                              const char __user *buf,
 547                              int in_len, int out_len)
 548 {
 549         struct ib_uverbs_dealloc_pd cmd;
 550         struct ib_uobject          *uobj;
 551         int                         ret;
 552
 553         if (copy_from_user(&cmd, buf, sizeof cmd))
 554                 return -EFAULT;
 555
 556         uobj = idr_write_uobj(&ib_uverbs_pd_idr, cmd.pd_handle, file->ucontext);
 557         if (!uobj)
 558                 return -EINVAL;
 559
 560         ret = ib_dealloc_pd(uobj->object);
 561         if (!ret)
 562                 uobj->live = 0;
 563
 564         put_uobj_write(uobj);
 565
 566         if (ret)
 567                 return ret;
 568
 569         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 570
 571         mutex_lock(&file->mutex);
 572         list_del(&uobj->list);
 573         mutex_unlock(&file->mutex);
 574
 575         put_uobj(uobj);
 576
 577         return in_len;
 578 }
 579
 580 ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
 581                          const char __user *buf, int in_len,
 582                          int out_len)
 583 {
 584         struct ib_uverbs_reg_mr      cmd;
 585         struct ib_uverbs_reg_mr_resp resp;
 586         struct ib_udata              udata;
 587         struct ib_uobject           *uobj;
 588         struct ib_pd                *pd;
 589         struct ib_mr                *mr;
 590         int                          ret;
 591
 592         if (out_len < sizeof resp)
 593                 return -ENOSPC;
 594
 595         if (copy_from_user(&cmd, buf, sizeof cmd))
 596                 return -EFAULT;
 597
 598         INIT_UDATA(&udata, buf + sizeof cmd,
 599                    (unsigned long) cmd.response + sizeof resp,
 600                    in_len - sizeof cmd, out_len - sizeof resp);
 601
 602         if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))
 603                 return -EINVAL;
 604
 605         /*
 606          * Local write permission is required if remote write or
 607          * remote atomic permission is also requested.
 608          */
 609         if (cmd.access_flags & (IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_REMOTE_WRITE) &&
 610             !(cmd.access_flags & IB_ACCESS_LOCAL_WRITE))
 611                 return -EINVAL;
 612
 613         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
 614         if (!uobj)
 615                 return -ENOMEM;
 616
 617         init_uobj(uobj, 0, file->ucontext, &mr_lock_key);
 618         down_write(&uobj->mutex);
 619
 620         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
 621         if (!pd) {
 622                 ret = -EINVAL;
 623                 goto err_free;
 624         }
 625
 626         mr = pd->device->reg_user_mr(pd, cmd.start, cmd.length, cmd.hca_va,
 627                                      cmd.access_flags, &udata);
 628         if (IS_ERR(mr)) {
 629                 ret = PTR_ERR(mr);
 630                 goto err_put;
 631         }
 632
 633         mr->device  = pd->device;
 634         mr->pd      = pd;
 635         mr->uobject = uobj;
 636         atomic_inc(&pd->usecnt);
 637         atomic_set(&mr->usecnt, 0);
 638
 639         uobj->object = mr;
 640         ret = idr_add_uobj(&ib_uverbs_mr_idr, uobj);
 641         if (ret)
 642                 goto err_unreg;
 643
 644         memset(&resp, 0, sizeof resp);
 645         resp.lkey      = mr->lkey;
 646         resp.rkey      = mr->rkey;
 647         resp.mr_handle = uobj->id;
 648
 649         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 650                          &resp, sizeof resp)) {
 651                 ret = -EFAULT;
 652                 goto err_copy;
 653         }
 654
 655         put_pd_read(pd);
 656
 657         mutex_lock(&file->mutex);
 658         list_add_tail(&uobj->list, &file->ucontext->mr_list);
 659         mutex_unlock(&file->mutex);
 660
 661         uobj->live = 1;
 662
 663         up_write(&uobj->mutex);
 664
 665         return in_len;
 666
 667 err_copy:
 668         idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 669
 670 err_unreg:
 671         ib_dereg_mr(mr);
 672
 673 err_put:
 674         put_pd_read(pd);
 675
 676 err_free:
 677         put_uobj_write(uobj);
 678         return ret;
 679 }
 680
 681 ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
 682                            const char __user *buf, int in_len,
 683                            int out_len)
 684 {
 685         struct ib_uverbs_dereg_mr cmd;
 686         struct ib_mr             *mr;
 687         struct ib_uobject        *uobj;
 688         int                       ret = -EINVAL;
 689
 690         if (copy_from_user(&cmd, buf, sizeof cmd))
 691                 return -EFAULT;
 692
 693         uobj = idr_write_uobj(&ib_uverbs_mr_idr, cmd.mr_handle, file->ucontext);
 694         if (!uobj)
 695                 return -EINVAL;
 696
 697         mr = uobj->object;
 698
 699         ret = ib_dereg_mr(mr);
 700         if (!ret)
 701                 uobj->live = 0;
 702
 703         put_uobj_write(uobj);
 704
 705         if (ret)
 706                 return ret;
 707
 708         idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 709
 710         mutex_lock(&file->mutex);
 711         list_del(&uobj->list);
 712         mutex_unlock(&file->mutex);
 713
 714         put_uobj(uobj);
 715
 716         return in_len;
 717 }
 718
 719 ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
 720                                       const char __user *buf, int in_len,
 721                                       int out_len)
 722 {
 723         struct ib_uverbs_create_comp_channel       cmd;
 724         struct ib_uverbs_create_comp_channel_resp  resp;
 725         struct file                               *filp;
 726         int ret;
 727
 728         if (out_len < sizeof resp)
 729                 return -ENOSPC;
 730
 731         if (copy_from_user(&cmd, buf, sizeof cmd))
 732                 return -EFAULT;
 733
 734         ret = get_unused_fd();
 735         if (ret < 0)
 736                 return ret;
 737         resp.fd = ret;
 738
 739         filp = ib_uverbs_alloc_event_file(file, 0);
 740         if (IS_ERR(filp)) {
 741                 put_unused_fd(resp.fd);
 742                 return PTR_ERR(filp);
 743         }
 744
 745         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 746                          &resp, sizeof resp)) {
 747                 put_unused_fd(resp.fd);
 748                 fput(filp);
 749                 return -EFAULT;
 750         }
 751
 752         fd_install(resp.fd, filp);
 753         return in_len;
 754 }
 755
 756 ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
 757                             const char __user *buf, int in_len,
 758                             int out_len)
 759 {
 760         struct ib_uverbs_create_cq      cmd;
 761         struct ib_uverbs_create_cq_resp resp;
 762         struct ib_udata                 udata;
 763         struct ib_ucq_object           *obj;
 764         struct ib_uverbs_event_file    *ev_file = NULL;
 765         struct ib_cq                   *cq;
 766         int                             ret;
 767
 768         if (out_len < sizeof resp)
 769                 return -ENOSPC;
 770
 771         if (copy_from_user(&cmd, buf, sizeof cmd))
 772                 return -EFAULT;
 773
 774         INIT_UDATA(&udata, buf + sizeof cmd,
 775                    (unsigned long) cmd.response + sizeof resp,
 776                    in_len - sizeof cmd, out_len - sizeof resp);
 777
 778         if (cmd.comp_vector >= file->device->num_comp_vectors)
 779                 return -EINVAL;
 780
 781         obj = kmalloc(sizeof *obj, GFP_KERNEL);
 782         if (!obj)
 783                 return -ENOMEM;
 784
 785         init_uobj(&obj->uobject, cmd.user_handle, file->ucontext, &cq_lock_key);
 786         down_write(&obj->uobject.mutex);
 787
 788         if (cmd.comp_channel >= 0) {
 789                 ev_file = ib_uverbs_lookup_comp_file(cmd.comp_channel);
 790                 if (!ev_file) {
 791                         ret = -EINVAL;
 792                         goto err;
 793                 }
 794         }
 795
 796         obj->uverbs_file           = file;
 797         obj->comp_events_reported  = 0;
 798         obj->async_events_reported = 0;
 799         INIT_LIST_HEAD(&obj->comp_list);
 800         INIT_LIST_HEAD(&obj->async_list);
 801
 802         cq = file->device->ib_dev->create_cq(file->device->ib_dev, cmd.cqe,
 803                                              cmd.comp_vector,
 804                                              file->ucontext, &udata);
 805         if (IS_ERR(cq)) {
 806                 ret = PTR_ERR(cq);
 807                 goto err_file;
 808         }
 809
 810         cq->device        = file->device->ib_dev;
 811         cq->uobject       = &obj->uobject;
 812         cq->comp_handler  = ib_uverbs_comp_handler;
 813         cq->event_handler = ib_uverbs_cq_event_handler;
 814         cq->cq_context    = ev_file;
 815         atomic_set(&cq->usecnt, 0);
 816
 817         obj->uobject.object = cq;
 818         ret = idr_add_uobj(&ib_uverbs_cq_idr, &obj->uobject);
 819         if (ret)
 820                 goto err_free;
 821
 822         memset(&resp, 0, sizeof resp);
 823         resp.cq_handle = obj->uobject.id;
 824         resp.cqe       = cq->cqe;
 825
 826         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 827                          &resp, sizeof resp)) {
 828                 ret = -EFAULT;
 829                 goto err_copy;
 830         }
 831
 832         mutex_lock(&file->mutex);
 833         list_add_tail(&obj->uobject.list, &file->ucontext->cq_list);
 834         mutex_unlock(&file->mutex);
 835
 836         obj->uobject.live = 1;
 837
 838         up_write(&obj->uobject.mutex);
 839
 840         return in_len;
 841
 842 err_copy:
 843         idr_remove_uobj(&ib_uverbs_cq_idr, &obj->uobject);
 844
 845 err_free:
 846         ib_destroy_cq(cq);
 847
 848 err_file:
 849         if (ev_file)
 850                 ib_uverbs_release_ucq(file, ev_file, obj);
 851
 852 err:
 853         put_uobj_write(&obj->uobject);
 854         return ret;
 855 }
 856
 857 ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
 858                             const char __user *buf, int in_len,
 859                             int out_len)
 860 {
 861         struct ib_uverbs_resize_cq      cmd;
 862         struct ib_uverbs_resize_cq_resp resp;
 863         struct ib_udata                 udata;
 864         struct ib_cq                    *cq;
 865         int                             ret = -EINVAL;
 866
 867         if (copy_from_user(&cmd, buf, sizeof cmd))
 868                 return -EFAULT;
 869
 870         INIT_UDATA(&udata, buf + sizeof cmd,
 871                    (unsigned long) cmd.response + sizeof resp,
 872                    in_len - sizeof cmd, out_len - sizeof resp);
 873
 874         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
 875         if (!cq)
 876                 return -EINVAL;
 877
 878         ret = cq->device->resize_cq(cq, cmd.cqe, &udata);
 879         if (ret)
 880                 goto out;
 881
 882         resp.cqe = cq->cqe;
 883
 884         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 885                          &resp, sizeof resp.cqe))
 886                 ret = -EFAULT;
 887
 888 out:
 889         put_cq_read(cq);
 890
 891         return ret ? ret : in_len;
 892 }
 893
 894 ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
 895                           const char __user *buf, int in_len,
 896                           int out_len)
 897 {
 898         struct ib_uverbs_poll_cq       cmd;
 899         struct ib_uverbs_poll_cq_resp *resp;
 900         struct ib_cq                  *cq;
 901         struct ib_wc                  *wc;
 902         int                            ret = 0;
 903         int                            i;
 904         int                            rsize;
 905
 906         if (copy_from_user(&cmd, buf, sizeof cmd))
 907                 return -EFAULT;
 908
 909         wc = kmalloc(cmd.ne * sizeof *wc, GFP_KERNEL);
 910         if (!wc)
 911                 return -ENOMEM;
 912
 913         rsize = sizeof *resp + cmd.ne * sizeof(struct ib_uverbs_wc);
 914         resp = kmalloc(rsize, GFP_KERNEL);
 915         if (!resp) {
 916                 ret = -ENOMEM;
 917                 goto out_wc;
 918         }
 919
 920         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
 921         if (!cq) {
 922                 ret = -EINVAL;
 923                 goto out;
 924         }
 925
 926         resp->count = ib_poll_cq(cq, cmd.ne, wc);
 927
 928         put_cq_read(cq);
 929
 930         for (i = 0; i < resp->count; i++) {
 931                 resp->wc[i].wr_id          = wc[i].wr_id;
 932                 resp->wc[i].status         = wc[i].status;
 933                 resp->wc[i].opcode         = wc[i].opcode;
 934                 resp->wc[i].vendor_err     = wc[i].vendor_err;
 935                 resp->wc[i].byte_len       = wc[i].byte_len;
 936                 resp->wc[i].ex.imm_data    = (__u32 __force) wc[i].ex.imm_data;
 937                 resp->wc[i].qp_num         = wc[i].qp->qp_num;
 938                 resp->wc[i].src_qp         = wc[i].src_qp;
 939                 resp->wc[i].wc_flags       = wc[i].wc_flags;
 940                 resp->wc[i].pkey_index     = wc[i].pkey_index;
 941                 resp->wc[i].slid           = wc[i].slid;
 942                 resp->wc[i].sl             = wc[i].sl;
 943                 resp->wc[i].dlid_path_bits = wc[i].dlid_path_bits;
 944                 resp->wc[i].port_num       = wc[i].port_num;
 945         }
 946
 947         if (copy_to_user((void __user *) (unsigned long) cmd.response, resp, rsize))
 948                 ret = -EFAULT;
 949
 950 out:
 951         kfree(resp);
 952
 953 out_wc:
 954         kfree(wc);
 955         return ret ? ret : in_len;
 956 }
 957
 958 ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file,
 959                                 const char __user *buf, int in_len,
 960                                 int out_len)
 961 {
 962         struct ib_uverbs_req_notify_cq cmd;
 963         struct ib_cq                  *cq;
 964
 965         if (copy_from_user(&cmd, buf, sizeof cmd))
 966                 return -EFAULT;
 967
 968         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
 969         if (!cq)
 970                 return -EINVAL;
 971
 972         ib_req_notify_cq(cq, cmd.solicited_only ?
 973                          IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
 974
 975         put_cq_read(cq);
 976
 977         return in_len;
 978 }
 979
 980 ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
 981                              const char __user *buf, int in_len,
 982                              int out_len)
 983 {
 984         struct ib_uverbs_destroy_cq      cmd;
 985         struct ib_uverbs_destroy_cq_resp resp;
 986         struct ib_uobject               *uobj;
 987         struct ib_cq                    *cq;
 988         struct ib_ucq_object            *obj;
 989         struct ib_uverbs_event_file     *ev_file;
 990         int                              ret = -EINVAL;
 991
 992         if (copy_from_user(&cmd, buf, sizeof cmd))
 993                 return -EFAULT;
 994
 995         uobj = idr_write_uobj(&ib_uverbs_cq_idr, cmd.cq_handle, file->ucontext);
 996         if (!uobj)
 997                 return -EINVAL;
 998         cq      = uobj->object;
 999         ev_file = cq->cq_context;
1000         obj     = container_of(cq->uobject, struct ib_ucq_object, uobject);
1001
1002         ret = ib_destroy_cq(cq);
1003         if (!ret)
1004                 uobj->live = 0;
1005
1006         put_uobj_write(uobj);
1007
1008         if (ret)
1009                 return ret;
1010
1011         idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
1012
1013         mutex_lock(&file->mutex);
1014         list_del(&uobj->list);
1015         mutex_unlock(&file->mutex);
1016
1017         ib_uverbs_release_ucq(file, ev_file, obj);
1018
1019         memset(&resp, 0, sizeof resp);
1020         resp.comp_events_reported  = obj->comp_events_reported;
1021         resp.async_events_reported = obj->async_events_reported;
1022
1023         put_uobj(uobj);
1024
1025         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1026                          &resp, sizeof resp))
1027                 return -EFAULT;
1028
1029         return in_len;
1030 }
1031
1032 ssize_t ib_uverbs_create_qp(struct ib_uverbs_file *file,
1033                             const char __user *buf, int in_len,
1034                             int out_len)
1035 {
1036         struct ib_uverbs_create_qp      cmd;
1037         struct ib_uverbs_create_qp_resp resp;
1038         struct ib_udata                 udata;
1039         struct ib_uqp_object           *obj;
1040         struct ib_pd                   *pd;
1041         struct ib_cq                   *scq, *rcq;
1042         struct ib_srq                  *srq;
1043         struct ib_qp                   *qp;
1044         struct ib_qp_init_attr          attr;
1045         int ret;
1046
1047         if (out_len < sizeof resp)
1048                 return -ENOSPC;
1049
1050         if (copy_from_user(&cmd, buf, sizeof cmd))
1051                 return -EFAULT;
1052
1053         INIT_UDATA(&udata, buf + sizeof cmd,
1054                    (unsigned long) cmd.response + sizeof resp,
1055                    in_len - sizeof cmd, out_len - sizeof resp);
1056
1057         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1058         if (!obj)
1059                 return -ENOMEM;
1060
1061         init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_key);
1062         down_write(&obj->uevent.uobject.mutex);
1063
1064         srq = cmd.is_srq ? idr_read_srq(cmd.srq_handle, file->ucontext) : NULL;
1065         pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
1066         scq = idr_read_cq(cmd.send_cq_handle, file->ucontext, 0);
1067         rcq = cmd.recv_cq_handle == cmd.send_cq_handle ?
1068                 scq : idr_read_cq(cmd.recv_cq_handle, file->ucontext, 1);
1069
1070         if (!pd || !scq || !rcq || (cmd.is_srq && !srq)) {
1071                 ret = -EINVAL;
1072                 goto err_put;
1073         }
1074
1075         attr.event_handler = ib_uverbs_qp_event_handler;
1076         attr.qp_context    = file;
1077         attr.send_cq       = scq;
1078         attr.recv_cq       = rcq;
1079         attr.srq           = srq;
1080         attr.sq_sig_type   = cmd.sq_sig_all ? IB_SIGNAL_ALL_WR : IB_SIGNAL_REQ_WR;
1081         attr.qp_type       = cmd.qp_type;
1082         attr.create_flags  = 0;
1083
1084         attr.cap.max_send_wr     = cmd.max_send_wr;
1085         attr.cap.max_recv_wr     = cmd.max_recv_wr;
1086         attr.cap.max_send_sge    = cmd.max_send_sge;
1087         attr.cap.max_recv_sge    = cmd.max_recv_sge;
1088         attr.cap.max_inline_data = cmd.max_inline_data;
1089
1090         obj->uevent.events_reported     = 0;
1091         INIT_LIST_HEAD(&obj->uevent.event_list);
1092         INIT_LIST_HEAD(&obj->mcast_list);
1093
1094         qp = pd->device->create_qp(pd, &attr, &udata);
1095         if (IS_ERR(qp)) {
1096                 ret = PTR_ERR(qp);
1097                 goto err_put;
1098         }
1099
1100         qp->device        = pd->device;
1101         qp->pd            = pd;
1102         qp->send_cq       = attr.send_cq;
1103         qp->recv_cq       = attr.recv_cq;
1104         qp->srq           = attr.srq;
1105         qp->uobject       = &obj->uevent.uobject;
1106         qp->event_handler = attr.event_handler;
1107         qp->qp_context    = attr.qp_context;
1108         qp->qp_type       = attr.qp_type;
1109         atomic_inc(&pd->usecnt);
1110         atomic_inc(&attr.send_cq->usecnt);
1111         atomic_inc(&attr.recv_cq->usecnt);
1112         if (attr.srq)
1113                 atomic_inc(&attr.srq->usecnt);
1114
1115         obj->uevent.uobject.object = qp;
1116         ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1117         if (ret)
1118                 goto err_destroy;
1119
1120         memset(&resp, 0, sizeof resp);
1121         resp.qpn             = qp->qp_num;
1122         resp.qp_handle       = obj->uevent.uobject.id;
1123         resp.max_recv_sge    = attr.cap.max_recv_sge;
1124         resp.max_send_sge    = attr.cap.max_send_sge;
1125         resp.max_recv_wr     = attr.cap.max_recv_wr;
1126         resp.max_send_wr     = attr.cap.max_send_wr;
1127         resp.max_inline_data = attr.cap.max_inline_data;
1128
1129         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1130                          &resp, sizeof resp)) {
1131                 ret = -EFAULT;
1132                 goto err_copy;
1133         }
1134
1135         put_pd_read(pd);
1136         put_cq_read(scq);
1137         if (rcq != scq)
1138                 put_cq_read(rcq);
1139         if (srq)
1140                 put_srq_read(srq);
1141
1142         mutex_lock(&file->mutex);
1143         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1144         mutex_unlock(&file->mutex);
1145
1146         obj->uevent.uobject.live = 1;
1147
1148         up_write(&obj->uevent.uobject.mutex);
1149
1150         return in_len;
1151
1152 err_copy:
1153         idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1154
1155 err_destroy:
1156         ib_destroy_qp(qp);
1157
1158 err_put:
1159         if (pd)
1160                 put_pd_read(pd);
1161         if (scq)
1162                 put_cq_read(scq);
1163         if (rcq && rcq != scq)
1164                 put_cq_read(rcq);
1165         if (srq)
1166                 put_srq_read(srq);
1167
1168         put_uobj_write(&obj->uevent.uobject);
1169         return ret;
1170 }
1171
1172 ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
1173                            const char __user *buf, int in_len,
1174                            int out_len)
1175 {
1176         struct ib_uverbs_query_qp      cmd;
1177         struct ib_uverbs_query_qp_resp resp;
1178         struct ib_qp                   *qp;
1179         struct ib_qp_attr              *attr;
1180         struct ib_qp_init_attr         *init_attr;
1181         int                            ret;
1182
1183         if (copy_from_user(&cmd, buf, sizeof cmd))
1184                 return -EFAULT;
1185
1186         attr      = kmalloc(sizeof *attr, GFP_KERNEL);
1187         init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
1188         if (!attr || !init_attr) {
1189                 ret = -ENOMEM;
1190                 goto out;
1191         }
1192
1193         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1194         if (!qp) {
1195                 ret = -EINVAL;
1196                 goto out;
1197         }
1198
1199         ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
1200
1201         put_qp_read(qp);
1202
1203         if (ret)
1204                 goto out;
1205
1206         memset(&resp, 0, sizeof resp);
1207
1208         resp.qp_state               = attr->qp_state;
1209         resp.cur_qp_state           = attr->cur_qp_state;
1210         resp.path_mtu               = attr->path_mtu;
1211         resp.path_mig_state         = attr->path_mig_state;
1212         resp.qkey                   = attr->qkey;
1213         resp.rq_psn                 = attr->rq_psn;
1214         resp.sq_psn                 = attr->sq_psn;
1215         resp.dest_qp_num            = attr->dest_qp_num;
1216         resp.qp_access_flags        = attr->qp_access_flags;
1217         resp.pkey_index             = attr->pkey_index;
1218         resp.alt_pkey_index         = attr->alt_pkey_index;
1219         resp.sq_draining            = attr->sq_draining;
1220         resp.max_rd_atomic          = attr->max_rd_atomic;
1221         resp.max_dest_rd_atomic     = attr->max_dest_rd_atomic;
1222         resp.min_rnr_timer          = attr->min_rnr_timer;
1223         resp.port_num               = attr->port_num;
1224         resp.timeout                = attr->timeout;
1225         resp.retry_cnt              = attr->retry_cnt;
1226         resp.rnr_retry              = attr->rnr_retry;
1227         resp.alt_port_num           = attr->alt_port_num;
1228         resp.alt_timeout            = attr->alt_timeout;
1229
1230         memcpy(resp.dest.dgid, attr->ah_attr.grh.dgid.raw, 16);
1231         resp.dest.flow_label        = attr->ah_attr.grh.flow_label;
1232         resp.dest.sgid_index        = attr->ah_attr.grh.sgid_index;
1233         resp.dest.hop_limit         = attr->ah_attr.grh.hop_limit;
1234         resp.dest.traffic_class     = attr->ah_attr.grh.traffic_class;
1235         resp.dest.dlid              = attr->ah_attr.dlid;
1236         resp.dest.sl                = attr->ah_attr.sl;
1237         resp.dest.src_path_bits     = attr->ah_attr.src_path_bits;
1238         resp.dest.static_rate       = attr->ah_attr.static_rate;
1239         resp.dest.is_global         = !!(attr->ah_attr.ah_flags & IB_AH_GRH);
1240         resp.dest.port_num          = attr->ah_attr.port_num;
1241
1242         memcpy(resp.alt_dest.dgid, attr->alt_ah_attr.grh.dgid.raw, 16);
1243         resp.alt_dest.flow_label    = attr->alt_ah_attr.grh.flow_label;
1244         resp.alt_dest.sgid_index    = attr->alt_ah_attr.grh.sgid_index;
1245         resp.alt_dest.hop_limit     = attr->alt_ah_attr.grh.hop_limit;
1246         resp.alt_dest.traffic_class = attr->alt_ah_attr.grh.traffic_class;
1247         resp.alt_dest.dlid          = attr->alt_ah_attr.dlid;
1248         resp.alt_dest.sl            = attr->alt_ah_attr.sl;
1249         resp.alt_dest.src_path_bits = attr->alt_ah_attr.src_path_bits;
1250         resp.alt_dest.static_rate   = attr->alt_ah_attr.static_rate;
1251         resp.alt_dest.is_global     = !!(attr->alt_ah_attr.ah_flags & IB_AH_GRH);
1252         resp.alt_dest.port_num      = attr->alt_ah_attr.port_num;
1253
1254         resp.max_send_wr            = init_attr->cap.max_send_wr;
1255         resp.max_recv_wr            = init_attr->cap.max_recv_wr;
1256         resp.max_send_sge           = init_attr->cap.max_send_sge;
1257         resp.max_recv_sge           = init_attr->cap.max_recv_sge;
1258         resp.max_inline_data        = init_attr->cap.max_inline_data;
1259         resp.sq_sig_all             = init_attr->sq_sig_type == IB_SIGNAL_ALL_WR;
1260
1261         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1262                          &resp, sizeof resp))
1263                 ret = -EFAULT;
1264
1265 out:
1266         kfree(attr);
1267         kfree(init_attr);
1268
1269         return ret ? ret : in_len;
1270 }
1271
1272 ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file,
1273                             const char __user *buf, int in_len,
1274                             int out_len)
1275 {
1276         struct ib_uverbs_modify_qp cmd;
1277         struct ib_udata            udata;
1278         struct ib_qp              *qp;
1279         struct ib_qp_attr         *attr;
1280         int                        ret;
1281
1282         if (copy_from_user(&cmd, buf, sizeof cmd))
1283                 return -EFAULT;
1284
1285         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
1286                    out_len);
1287
1288         attr = kmalloc(sizeof *attr, GFP_KERNEL);
1289         if (!attr)
1290                 return -ENOMEM;
1291
1292         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1293         if (!qp) {
1294                 ret = -EINVAL;
1295                 goto out;
1296         }
1297
1298         attr->qp_state            = cmd.qp_state;
1299         attr->cur_qp_state        = cmd.cur_qp_state;
1300         attr->path_mtu            = cmd.path_mtu;
1301         attr->path_mig_state      = cmd.path_mig_state;
1302         attr->qkey                = cmd.qkey;
1303         attr->rq_psn              = cmd.rq_psn;
1304         attr->sq_psn              = cmd.sq_psn;
1305         attr->dest_qp_num         = cmd.dest_qp_num;
1306         attr->qp_access_flags     = cmd.qp_access_flags;
1307         attr->pkey_index          = cmd.pkey_index;
1308         attr->alt_pkey_index      = cmd.alt_pkey_index;
1309         attr->en_sqd_async_notify = cmd.en_sqd_async_notify;
1310         attr->max_rd_atomic       = cmd.max_rd_atomic;
1311         attr->max_dest_rd_atomic  = cmd.max_dest_rd_atomic;
1312         attr->min_rnr_timer       = cmd.min_rnr_timer;
1313         attr->port_num            = cmd.port_num;
1314         attr->timeout             = cmd.timeout;
1315         attr->retry_cnt           = cmd.retry_cnt;
1316         attr->rnr_retry           = cmd.rnr_retry;
1317         attr->alt_port_num        = cmd.alt_port_num;
1318         attr->alt_timeout         = cmd.alt_timeout;
1319
1320         memcpy(attr->ah_attr.grh.dgid.raw, cmd.dest.dgid, 16);
1321         attr->ah_attr.grh.flow_label        = cmd.dest.flow_label;
1322         attr->ah_attr.grh.sgid_index        = cmd.dest.sgid_index;
1323         attr->ah_attr.grh.hop_limit         = cmd.dest.hop_limit;
1324         attr->ah_attr.grh.traffic_class     = cmd.dest.traffic_class;
1325         attr->ah_attr.dlid                  = cmd.dest.dlid;
1326         attr->ah_attr.sl                    = cmd.dest.sl;
1327         attr->ah_attr.src_path_bits         = cmd.dest.src_path_bits;
1328         attr->ah_attr.static_rate           = cmd.dest.static_rate;
1329         attr->ah_attr.ah_flags              = cmd.dest.is_global ? IB_AH_GRH : 0;
1330         attr->ah_attr.port_num              = cmd.dest.port_num;
1331
1332         memcpy(attr->alt_ah_attr.grh.dgid.raw, cmd.alt_dest.dgid, 16);
1333         attr->alt_ah_attr.grh.flow_label    = cmd.alt_dest.flow_label;
1334         attr->alt_ah_attr.grh.sgid_index    = cmd.alt_dest.sgid_index;
1335         attr->alt_ah_attr.grh.hop_limit     = cmd.alt_dest.hop_limit;
1336         attr->alt_ah_attr.grh.traffic_class = cmd.alt_dest.traffic_class;
1337         attr->alt_ah_attr.dlid              = cmd.alt_dest.dlid;
1338         attr->alt_ah_attr.sl                = cmd.alt_dest.sl;
1339         attr->alt_ah_attr.src_path_bits     = cmd.alt_dest.src_path_bits;
1340         attr->alt_ah_attr.static_rate       = cmd.alt_dest.static_rate;
1341         attr->alt_ah_attr.ah_flags          = cmd.alt_dest.is_global ? IB_AH_GRH : 0;
1342         attr->alt_ah_attr.port_num          = cmd.alt_dest.port_num;
1343
1344         ret = qp->device->modify_qp(qp, attr, cmd.attr_mask, &udata);
1345
1346         put_qp_read(qp);
1347
1348         if (ret)
1349                 goto out;
1350
1351         ret = in_len;
1352
1353 out:
1354         kfree(attr);
1355
1356         return ret;
1357 }
1358
1359 ssize_t ib_uverbs_destroy_qp(struct ib_uverbs_file *file,
1360                              const char __user *buf, int in_len,
1361                              int out_len)
1362 {
1363         struct ib_uverbs_destroy_qp      cmd;
1364         struct ib_uverbs_destroy_qp_resp resp;
1365         struct ib_uobject               *uobj;
1366         struct ib_qp                    *qp;
1367         struct ib_uqp_object            *obj;
1368         int                              ret = -EINVAL;
1369
1370         if (copy_from_user(&cmd, buf, sizeof cmd))
1371                 return -EFAULT;
1372
1373         memset(&resp, 0, sizeof resp);
1374
1375         uobj = idr_write_uobj(&ib_uverbs_qp_idr, cmd.qp_handle, file->ucontext);
1376         if (!uobj)
1377                 return -EINVAL;
1378         qp  = uobj->object;
1379         obj = container_of(uobj, struct ib_uqp_object, uevent.uobject);
1380
1381         if (!list_empty(&obj->mcast_list)) {
1382                 put_uobj_write(uobj);
1383                 return -EBUSY;
1384         }
1385
1386         ret = ib_destroy_qp(qp);
1387         if (!ret)
1388                 uobj->live = 0;
1389
1390         put_uobj_write(uobj);
1391
1392         if (ret)
1393                 return ret;
1394
1395         idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
1396
1397         mutex_lock(&file->mutex);
1398         list_del(&uobj->list);
1399         mutex_unlock(&file->mutex);
1400
1401         ib_uverbs_release_uevent(file, &obj->uevent);
1402
1403         resp.events_reported = obj->uevent.events_reported;
1404
1405         put_uobj(uobj);
1406
1407         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1408                          &resp, sizeof resp))
1409                 return -EFAULT;
1410
1411         return in_len;
1412 }
1413
1414 ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
1415                             const char __user *buf, int in_len,
1416                             int out_len)
1417 {
1418         struct ib_uverbs_post_send      cmd;
1419         struct ib_uverbs_post_send_resp resp;
1420         struct ib_uverbs_send_wr       *user_wr;
1421         struct ib_send_wr              *wr = NULL, *last, *next, *bad_wr;
1422         struct ib_qp                   *qp;
1423         int                             i, sg_ind;
1424         int                             is_ud;
1425         ssize_t                         ret = -EINVAL;
1426
1427         if (copy_from_user(&cmd, buf, sizeof cmd))
1428                 return -EFAULT;
1429
1430         if (in_len < sizeof cmd + cmd.wqe_size * cmd.wr_count +
1431             cmd.sge_count * sizeof (struct ib_uverbs_sge))
1432                 return -EINVAL;
1433
1434         if (cmd.wqe_size < sizeof (struct ib_uverbs_send_wr))
1435                 return -EINVAL;
1436
1437         user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL);
1438         if (!user_wr)
1439                 return -ENOMEM;
1440
1441         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1442         if (!qp)
1443                 goto out;
1444
1445         is_ud = qp->qp_type == IB_QPT_UD;
1446         sg_ind = 0;
1447         last = NULL;
1448         for (i = 0; i < cmd.wr_count; ++i) {
1449                 if (copy_from_user(user_wr,
1450                                    buf + sizeof cmd + i * cmd.wqe_size,
1451                                    cmd.wqe_size)) {
1452                         ret = -EFAULT;
1453                         goto out_put;
1454                 }
1455
1456                 if (user_wr->num_sge + sg_ind > cmd.sge_count) {
1457                         ret = -EINVAL;
1458                         goto out_put;
1459                 }
1460
1461                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
1462                                user_wr->num_sge * sizeof (struct ib_sge),
1463                                GFP_KERNEL);
1464                 if (!next) {
1465                         ret = -ENOMEM;
1466                         goto out_put;
1467                 }
1468
1469                 if (!last)
1470                         wr = next;
1471                 else
1472                         last->next = next;
1473                 last = next;
1474
1475                 next->next       = NULL;
1476                 next->wr_id      = user_wr->wr_id;
1477                 next->num_sge    = user_wr->num_sge;
1478                 next->opcode     = user_wr->opcode;
1479                 next->send_flags = user_wr->send_flags;
1480
1481                 if (is_ud) {
1482                         next->wr.ud.ah = idr_read_ah(user_wr->wr.ud.ah,
1483                                                      file->ucontext);
1484                         if (!next->wr.ud.ah) {
1485                                 ret = -EINVAL;
1486                                 goto out_put;
1487                         }
1488                         next->wr.ud.remote_qpn  = user_wr->wr.ud.remote_qpn;
1489                         next->wr.ud.remote_qkey = user_wr->wr.ud.remote_qkey;
1490                 } else {
1491                         switch (next->opcode) {
1492                         case IB_WR_RDMA_WRITE_WITH_IMM:
1493                                 next->ex.imm_data =
1494                                         (__be32 __force) user_wr->ex.imm_data;
1495                         case IB_WR_RDMA_WRITE:
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_SEND_WITH_IMM:
1503                                 next->ex.imm_data =
1504                                         (__be32 __force) user_wr->ex.imm_data;
1505                                 break;
1506                         case IB_WR_SEND_WITH_INV:
1507                                 next->ex.invalidate_rkey =
1508                                         user_wr->ex.invalidate_rkey;
1509                                 break;
1510                         case IB_WR_ATOMIC_CMP_AND_SWP:
1511                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1512                                 next->wr.atomic.remote_addr =
1513                                         user_wr->wr.atomic.remote_addr;
1514                                 next->wr.atomic.compare_add =
1515                                         user_wr->wr.atomic.compare_add;
1516                                 next->wr.atomic.swap = user_wr->wr.atomic.swap;
1517                                 next->wr.atomic.rkey = user_wr->wr.atomic.rkey;
1518                                 break;
1519                         default:
1520                                 break;
1521                         }
1522                 }
1523
1524                 if (next->num_sge) {
1525                         next->sg_list = (void *) next +
1526                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
1527                         if (copy_from_user(next->sg_list,
1528                                            buf + sizeof cmd +
1529                                            cmd.wr_count * cmd.wqe_size +
1530                                            sg_ind * sizeof (struct ib_sge),
1531                                            next->num_sge * sizeof (struct ib_sge))) {
1532                                 ret = -EFAULT;
1533                                 goto out_put;
1534                         }
1535                         sg_ind += next->num_sge;
1536                 } else
1537                         next->sg_list = NULL;
1538         }
1539
1540         resp.bad_wr = 0;
1541         ret = qp->device->post_send(qp, wr, &bad_wr);
1542         if (ret)
1543                 for (next = wr; next; next = next->next) {
1544                         ++resp.bad_wr;
1545                         if (next == bad_wr)
1546                                 break;
1547                 }
1548
1549         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1550                          &resp, sizeof resp))
1551                 ret = -EFAULT;
1552
1553 out_put:
1554         put_qp_read(qp);
1555
1556         while (wr) {
1557                 if (is_ud && wr->wr.ud.ah)
1558                         put_ah_read(wr->wr.ud.ah);
1559                 next = wr->next;
1560                 kfree(wr);
1561                 wr = next;
1562         }
1563
1564 out:
1565         kfree(user_wr);
1566
1567         return ret ? ret : in_len;
1568 }
1569
1570 static struct ib_recv_wr *ib_uverbs_unmarshall_recv(const char __user *buf,
1571                                                     int in_len,
1572                                                     u32 wr_count,
1573                                                     u32 sge_count,
1574                                                     u32 wqe_size)
1575 {
1576         struct ib_uverbs_recv_wr *user_wr;
1577         struct ib_recv_wr        *wr = NULL, *last, *next;
1578         int                       sg_ind;
1579         int                       i;
1580         int                       ret;
1581
1582         if (in_len < wqe_size * wr_count +
1583             sge_count * sizeof (struct ib_uverbs_sge))
1584                 return ERR_PTR(-EINVAL);
1585
1586         if (wqe_size < sizeof (struct ib_uverbs_recv_wr))
1587                 return ERR_PTR(-EINVAL);
1588
1589         user_wr = kmalloc(wqe_size, GFP_KERNEL);
1590         if (!user_wr)
1591                 return ERR_PTR(-ENOMEM);
1592
1593         sg_ind = 0;
1594         last = NULL;
1595         for (i = 0; i < wr_count; ++i) {
1596                 if (copy_from_user(user_wr, buf + i * wqe_size,
1597                                    wqe_size)) {
1598                         ret = -EFAULT;
1599                         goto err;
1600                 }
1601
1602                 if (user_wr->num_sge + sg_ind > sge_count) {
1603                         ret = -EINVAL;
1604                         goto err;
1605                 }
1606
1607                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
1608                                user_wr->num_sge * sizeof (struct ib_sge),
1609                                GFP_KERNEL);
1610                 if (!next) {
1611                         ret = -ENOMEM;
1612                         goto err;
1613                 }
1614
1615                 if (!last)
1616                         wr = next;
1617                 else
1618                         last->next = next;
1619                 last = next;
1620
1621                 next->next       = NULL;
1622                 next->wr_id      = user_wr->wr_id;
1623                 next->num_sge    = user_wr->num_sge;
1624
1625                 if (next->num_sge) {
1626                         next->sg_list = (void *) next +
1627                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
1628                         if (copy_from_user(next->sg_list,
1629                                            buf + wr_count * wqe_size +
1630                                            sg_ind * sizeof (struct ib_sge),
1631                                            next->num_sge * sizeof (struct ib_sge))) {
1632                                 ret = -EFAULT;
1633                                 goto err;
1634                         }
1635                         sg_ind += next->num_sge;
1636                 } else
1637                         next->sg_list = NULL;
1638         }
1639
1640         kfree(user_wr);
1641         return wr;
1642
1643 err:
1644         kfree(user_wr);
1645
1646         while (wr) {
1647                 next = wr->next;
1648                 kfree(wr);
1649                 wr = next;
1650         }
1651
1652         return ERR_PTR(ret);
1653 }
1654
1655 ssize_t ib_uverbs_post_recv(struct ib_uverbs_file *file,
1656                             const char __user *buf, int in_len,
1657                             int out_len)
1658 {
1659         struct ib_uverbs_post_recv      cmd;
1660         struct ib_uverbs_post_recv_resp resp;
1661         struct ib_recv_wr              *wr, *next, *bad_wr;
1662         struct ib_qp                   *qp;
1663         ssize_t                         ret = -EINVAL;
1664
1665         if (copy_from_user(&cmd, buf, sizeof cmd))
1666                 return -EFAULT;
1667
1668         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
1669                                        in_len - sizeof cmd, cmd.wr_count,
1670                                        cmd.sge_count, cmd.wqe_size);
1671         if (IS_ERR(wr))
1672                 return PTR_ERR(wr);
1673
1674         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1675         if (!qp)
1676                 goto out;
1677
1678         resp.bad_wr = 0;
1679         ret = qp->device->post_recv(qp, wr, &bad_wr);
1680
1681         put_qp_read(qp);
1682
1683         if (ret)
1684                 for (next = wr; next; next = next->next) {
1685                         ++resp.bad_wr;
1686                         if (next == bad_wr)
1687                                 break;
1688                 }
1689
1690         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1691                          &resp, sizeof resp))
1692                 ret = -EFAULT;
1693
1694 out:
1695         while (wr) {
1696                 next = wr->next;
1697                 kfree(wr);
1698                 wr = next;
1699         }
1700
1701         return ret ? ret : in_len;
1702 }
1703
1704 ssize_t ib_uverbs_post_srq_recv(struct ib_uverbs_file *file,
1705                                 const char __user *buf, int in_len,
1706                                 int out_len)
1707 {
1708         struct ib_uverbs_post_srq_recv      cmd;
1709         struct ib_uverbs_post_srq_recv_resp resp;
1710         struct ib_recv_wr                  *wr, *next, *bad_wr;
1711         struct ib_srq                      *srq;
1712         ssize_t                             ret = -EINVAL;
1713
1714         if (copy_from_user(&cmd, buf, sizeof cmd))
1715                 return -EFAULT;
1716
1717         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
1718                                        in_len - sizeof cmd, cmd.wr_count,
1719                                        cmd.sge_count, cmd.wqe_size);
1720         if (IS_ERR(wr))
1721                 return PTR_ERR(wr);
1722
1723         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
1724         if (!srq)
1725                 goto out;
1726
1727         resp.bad_wr = 0;
1728         ret = srq->device->post_srq_recv(srq, wr, &bad_wr);
1729
1730         put_srq_read(srq);
1731
1732         if (ret)
1733                 for (next = wr; next; next = next->next) {
1734                         ++resp.bad_wr;
1735                         if (next == bad_wr)
1736                                 break;
1737                 }
1738
1739         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1740                          &resp, sizeof resp))
1741                 ret = -EFAULT;
1742
1743 out:
1744         while (wr) {
1745                 next = wr->next;
1746                 kfree(wr);
1747                 wr = next;
1748         }
1749
1750         return ret ? ret : in_len;
1751 }
1752
1753 ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
1754                             const char __user *buf, int in_len,
1755                             int out_len)
1756 {
1757         struct ib_uverbs_create_ah       cmd;
1758         struct ib_uverbs_create_ah_resp  resp;
1759         struct ib_uobject               *uobj;
1760         struct ib_pd                    *pd;
1761         struct ib_ah                    *ah;
1762         struct ib_ah_attr               attr;
1763         int ret;
1764
1765         if (out_len < sizeof resp)
1766                 return -ENOSPC;
1767
1768         if (copy_from_user(&cmd, buf, sizeof cmd))
1769                 return -EFAULT;
1770
1771         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
1772         if (!uobj)
1773                 return -ENOMEM;
1774
1775         init_uobj(uobj, cmd.user_handle, file->ucontext, &ah_lock_key);
1776         down_write(&uobj->mutex);
1777
1778         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
1779         if (!pd) {
1780                 ret = -EINVAL;
1781                 goto err;
1782         }
1783
1784         attr.dlid              = cmd.attr.dlid;
1785         attr.sl                = cmd.attr.sl;
1786         attr.src_path_bits     = cmd.attr.src_path_bits;
1787         attr.static_rate       = cmd.attr.static_rate;
1788         attr.ah_flags          = cmd.attr.is_global ? IB_AH_GRH : 0;
1789         attr.port_num          = cmd.attr.port_num;
1790         attr.grh.flow_label    = cmd.attr.grh.flow_label;
1791         attr.grh.sgid_index    = cmd.attr.grh.sgid_index;
1792         attr.grh.hop_limit     = cmd.attr.grh.hop_limit;
1793         attr.grh.traffic_class = cmd.attr.grh.traffic_class;
1794         memcpy(attr.grh.dgid.raw, cmd.attr.grh.dgid, 16);
1795
1796         ah = ib_create_ah(pd, &attr);
1797         if (IS_ERR(ah)) {
1798                 ret = PTR_ERR(ah);
1799                 goto err_put;
1800         }
1801
1802         ah->uobject  = uobj;
1803         uobj->object = ah;
1804
1805         ret = idr_add_uobj(&ib_uverbs_ah_idr, uobj);
1806         if (ret)
1807                 goto err_destroy;
1808
1809         resp.ah_handle = uobj->id;
1810
1811         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1812                          &resp, sizeof resp)) {
1813                 ret = -EFAULT;
1814                 goto err_copy;
1815         }
1816
1817         put_pd_read(pd);
1818
1819         mutex_lock(&file->mutex);
1820         list_add_tail(&uobj->list, &file->ucontext->ah_list);
1821         mutex_unlock(&file->mutex);
1822
1823         uobj->live = 1;
1824
1825         up_write(&uobj->mutex);
1826
1827         return in_len;
1828
1829 err_copy:
1830         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
1831
1832 err_destroy:
1833         ib_destroy_ah(ah);
1834
1835 err_put:
1836         put_pd_read(pd);
1837
1838 err:
1839         put_uobj_write(uobj);
1840         return ret;
1841 }
1842
1843 ssize_t ib_uverbs_destroy_ah(struct ib_uverbs_file *file,
1844                              const char __user *buf, int in_len, int out_len)
1845 {
1846         struct ib_uverbs_destroy_ah cmd;
1847         struct ib_ah               *ah;
1848         struct ib_uobject          *uobj;
1849         int                         ret;
1850
1851         if (copy_from_user(&cmd, buf, sizeof cmd))
1852                 return -EFAULT;
1853
1854         uobj = idr_write_uobj(&ib_uverbs_ah_idr, cmd.ah_handle, file->ucontext);
1855         if (!uobj)
1856                 return -EINVAL;
1857         ah = uobj->object;
1858
1859         ret = ib_destroy_ah(ah);
1860         if (!ret)
1861                 uobj->live = 0;
1862
1863         put_uobj_write(uobj);
1864
1865         if (ret)
1866                 return ret;
1867
1868         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
1869
1870         mutex_lock(&file->mutex);
1871         list_del(&uobj->list);
1872         mutex_unlock(&file->mutex);
1873
1874         put_uobj(uobj);
1875
1876         return in_len;
1877 }
1878
1879 ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
1880                                const char __user *buf, int in_len,
1881                                int out_len)
1882 {
1883         struct ib_uverbs_attach_mcast cmd;
1884         struct ib_qp                 *qp;
1885         struct ib_uqp_object         *obj;
1886         struct ib_uverbs_mcast_entry *mcast;
1887         int                           ret;
1888
1889         if (copy_from_user(&cmd, buf, sizeof cmd))
1890                 return -EFAULT;
1891
1892         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1893         if (!qp)
1894                 return -EINVAL;
1895
1896         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
1897
1898         list_for_each_entry(mcast, &obj->mcast_list, list)
1899                 if (cmd.mlid == mcast->lid &&
1900                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
1901                         ret = 0;
1902                         goto out_put;
1903                 }
1904
1905         mcast = kmalloc(sizeof *mcast, GFP_KERNEL);
1906         if (!mcast) {
1907                 ret = -ENOMEM;
1908                 goto out_put;
1909         }
1910
1911         mcast->lid = cmd.mlid;
1912         memcpy(mcast->gid.raw, cmd.gid, sizeof mcast->gid.raw);
1913
1914         ret = ib_attach_mcast(qp, &mcast->gid, cmd.mlid);
1915         if (!ret)
1916                 list_add_tail(&mcast->list, &obj->mcast_list);
1917         else
1918                 kfree(mcast);
1919
1920 out_put:
1921         put_qp_read(qp);
1922
1923         return ret ? ret : in_len;
1924 }
1925
1926 ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
1927                                const char __user *buf, int in_len,
1928                                int out_len)
1929 {
1930         struct ib_uverbs_detach_mcast cmd;
1931         struct ib_uqp_object         *obj;
1932         struct ib_qp                 *qp;
1933         struct ib_uverbs_mcast_entry *mcast;
1934         int                           ret = -EINVAL;
1935
1936         if (copy_from_user(&cmd, buf, sizeof cmd))
1937                 return -EFAULT;
1938
1939         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1940         if (!qp)
1941                 return -EINVAL;
1942
1943         ret = ib_detach_mcast(qp, (union ib_gid *) cmd.gid, cmd.mlid);
1944         if (ret)
1945                 goto out_put;
1946
1947         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
1948
1949         list_for_each_entry(mcast, &obj->mcast_list, list)
1950                 if (cmd.mlid == mcast->lid &&
1951                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
1952                         list_del(&mcast->list);
1953                         kfree(mcast);
1954                         break;
1955                 }
1956
1957 out_put:
1958         put_qp_read(qp);
1959
1960         return ret ? ret : in_len;
1961 }
1962
1963 ssize_t ib_uverbs_create_srq(struct ib_uverbs_file *file,
1964                              const char __user *buf, int in_len,
1965                              int out_len)
1966 {
1967         struct ib_uverbs_create_srq      cmd;
1968         struct ib_uverbs_create_srq_resp resp;
1969         struct ib_udata                  udata;
1970         struct ib_uevent_object         *obj;
1971         struct ib_pd                    *pd;
1972         struct ib_srq                   *srq;
1973         struct ib_srq_init_attr          attr;
1974         int ret;
1975
1976         if (out_len < sizeof resp)
1977                 return -ENOSPC;
1978
1979         if (copy_from_user(&cmd, buf, sizeof cmd))
1980                 return -EFAULT;
1981
1982         INIT_UDATA(&udata, buf + sizeof cmd,
1983                    (unsigned long) cmd.response + sizeof resp,
1984                    in_len - sizeof cmd, out_len - sizeof resp);
1985
1986         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1987         if (!obj)
1988                 return -ENOMEM;
1989
1990         init_uobj(&obj->uobject, cmd.user_handle, file->ucontext, &srq_lock_key);
1991         down_write(&obj->uobject.mutex);
1992
1993         pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
1994         if (!pd) {
1995                 ret = -EINVAL;
1996                 goto err;
1997         }
1998
1999         attr.event_handler  = ib_uverbs_srq_event_handler;
2000         attr.srq_context    = file;
2001         attr.attr.max_wr    = cmd.max_wr;
2002         attr.attr.max_sge   = cmd.max_sge;
2003         attr.attr.srq_limit = cmd.srq_limit;
2004
2005         obj->events_reported     = 0;
2006         INIT_LIST_HEAD(&obj->event_list);
2007
2008         srq = pd->device->create_srq(pd, &attr, &udata);
2009         if (IS_ERR(srq)) {
2010                 ret = PTR_ERR(srq);
2011                 goto err_put;
2012         }
2013
2014         srq->device        = pd->device;
2015         srq->pd            = pd;
2016         srq->uobject       = &obj->uobject;
2017         srq->event_handler = attr.event_handler;
2018         srq->srq_context   = attr.srq_context;
2019         atomic_inc(&pd->usecnt);
2020         atomic_set(&srq->usecnt, 0);
2021
2022         obj->uobject.object = srq;
2023         ret = idr_add_uobj(&ib_uverbs_srq_idr, &obj->uobject);
2024         if (ret)
2025                 goto err_destroy;
2026
2027         memset(&resp, 0, sizeof resp);
2028         resp.srq_handle = obj->uobject.id;
2029         resp.max_wr     = attr.attr.max_wr;
2030         resp.max_sge    = attr.attr.max_sge;
2031
2032         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2033                          &resp, sizeof resp)) {
2034                 ret = -EFAULT;
2035                 goto err_copy;
2036         }
2037
2038         put_pd_read(pd);
2039
2040         mutex_lock(&file->mutex);
2041         list_add_tail(&obj->uobject.list, &file->ucontext->srq_list);
2042         mutex_unlock(&file->mutex);
2043
2044         obj->uobject.live = 1;
2045
2046         up_write(&obj->uobject.mutex);
2047
2048         return in_len;
2049
2050 err_copy:
2051         idr_remove_uobj(&ib_uverbs_srq_idr, &obj->uobject);
2052
2053 err_destroy:
2054         ib_destroy_srq(srq);
2055
2056 err_put:
2057         put_pd_read(pd);
2058
2059 err:
2060         put_uobj_write(&obj->uobject);
2061         return ret;
2062 }
2063
2064 ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
2065                              const char __user *buf, int in_len,
2066                              int out_len)
2067 {
2068         struct ib_uverbs_modify_srq cmd;
2069         struct ib_udata             udata;
2070         struct ib_srq              *srq;
2071         struct ib_srq_attr          attr;
2072         int                         ret;
2073
2074         if (copy_from_user(&cmd, buf, sizeof cmd))
2075                 return -EFAULT;
2076
2077         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
2078                    out_len);
2079
2080         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2081         if (!srq)
2082                 return -EINVAL;
2083
2084         attr.max_wr    = cmd.max_wr;
2085         attr.srq_limit = cmd.srq_limit;
2086
2087         ret = srq->device->modify_srq(srq, &attr, cmd.attr_mask, &udata);
2088
2089         put_srq_read(srq);
2090
2091         return ret ? ret : in_len;
2092 }
2093
2094 ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
2095                             const char __user *buf,
2096                             int in_len, int out_len)
2097 {
2098         struct ib_uverbs_query_srq      cmd;
2099         struct ib_uverbs_query_srq_resp resp;
2100         struct ib_srq_attr              attr;
2101         struct ib_srq                   *srq;
2102         int                             ret;
2103
2104         if (out_len < sizeof resp)
2105                 return -ENOSPC;
2106
2107         if (copy_from_user(&cmd, buf, sizeof cmd))
2108                 return -EFAULT;
2109
2110         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2111         if (!srq)
2112                 return -EINVAL;
2113
2114         ret = ib_query_srq(srq, &attr);
2115
2116         put_srq_read(srq);
2117
2118         if (ret)
2119                 return ret;
2120
2121         memset(&resp, 0, sizeof resp);
2122
2123         resp.max_wr    = attr.max_wr;
2124         resp.max_sge   = attr.max_sge;
2125         resp.srq_limit = attr.srq_limit;
2126
2127         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2128                          &resp, sizeof resp))
2129                 return -EFAULT;
2130
2131         return in_len;
2132 }
2133
2134 ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
2135                               const char __user *buf, int in_len,
2136                               int out_len)
2137 {
2138         struct ib_uverbs_destroy_srq      cmd;
2139         struct ib_uverbs_destroy_srq_resp resp;
2140         struct ib_uobject                *uobj;
2141         struct ib_srq                    *srq;
2142         struct ib_uevent_object          *obj;
2143         int                               ret = -EINVAL;
2144
2145         if (copy_from_user(&cmd, buf, sizeof cmd))
2146                 return -EFAULT;
2147
2148         uobj = idr_write_uobj(&ib_uverbs_srq_idr, cmd.srq_handle, file->ucontext);
2149         if (!uobj)
2150                 return -EINVAL;
2151         srq = uobj->object;
2152         obj = container_of(uobj, struct ib_uevent_object, uobject);
2153
2154         ret = ib_destroy_srq(srq);
2155         if (!ret)
2156                 uobj->live = 0;
2157
2158         put_uobj_write(uobj);
2159
2160         if (ret)
2161                 return ret;
2162
2163         idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
2164
2165         mutex_lock(&file->mutex);
2166         list_del(&uobj->list);
2167         mutex_unlock(&file->mutex);
2168
2169         ib_uverbs_release_uevent(file, obj);
2170
2171         memset(&resp, 0, sizeof resp);
2172         resp.events_reported = obj->events_reported;
2173
2174         put_uobj(uobj);
2175
2176         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2177                          &resp, sizeof resp))
2178                 ret = -EFAULT;
2179
2180         return ret ? ret : in_len;
2181 }