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 static int copy_wc_to_user(void __user *dest, struct ib_wc *wc)
 895 {
 896         struct ib_uverbs_wc tmp;
 897
 898         tmp.wr_id               = wc->wr_id;
 899         tmp.status              = wc->status;
 900         tmp.opcode              = wc->opcode;
 901         tmp.vendor_err          = wc->vendor_err;
 902         tmp.byte_len            = wc->byte_len;
 903         tmp.ex.imm_data         = (__u32 __force) wc->ex.imm_data;
 904         tmp.qp_num              = wc->qp->qp_num;
 905         tmp.src_qp              = wc->src_qp;
 906         tmp.wc_flags            = wc->wc_flags;
 907         tmp.pkey_index          = wc->pkey_index;
 908         tmp.slid                = wc->slid;
 909         tmp.sl                  = wc->sl;
 910         tmp.dlid_path_bits      = wc->dlid_path_bits;
 911         tmp.port_num            = wc->port_num;
 912         tmp.reserved            = 0;
 913
 914         if (copy_to_user(dest, &tmp, sizeof tmp))
 915                 return -EFAULT;
 916
 917         return 0;
 918 }
 919
 920 ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
 921                           const char __user *buf, int in_len,
 922                           int out_len)
 923 {
 924         struct ib_uverbs_poll_cq       cmd;
 925         struct ib_uverbs_poll_cq_resp  resp;
 926         u8 __user                     *header_ptr;
 927         u8 __user                     *data_ptr;
 928         struct ib_cq                  *cq;
 929         struct ib_wc                   wc;
 930         int                            ret;
 931
 932         if (copy_from_user(&cmd, buf, sizeof cmd))
 933                 return -EFAULT;
 934
 935         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
 936         if (!cq)
 937                 return -EINVAL;
 938
 939         /* we copy a struct ib_uverbs_poll_cq_resp to user space */
 940         header_ptr = (void __user *)(unsigned long) cmd.response;
 941         data_ptr = header_ptr + sizeof resp;
 942
 943         memset(&resp, 0, sizeof resp);
 944         while (resp.count < cmd.ne) {
 945                 ret = ib_poll_cq(cq, 1, &wc);
 946                 if (ret < 0)
 947                         goto out_put;
 948                 if (!ret)
 949                         break;
 950
 951                 ret = copy_wc_to_user(data_ptr, &wc);
 952                 if (ret)
 953                         goto out_put;
 954
 955                 data_ptr += sizeof(struct ib_uverbs_wc);
 956                 ++resp.count;
 957         }
 958
 959         if (copy_to_user(header_ptr, &resp, sizeof resp)) {
 960                 ret = -EFAULT;
 961                 goto out_put;
 962         }
 963
 964         ret = in_len;
 965
 966 out_put:
 967         put_cq_read(cq);
 968         return ret;
 969 }
 970
 971 ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file,
 972                                 const char __user *buf, int in_len,
 973                                 int out_len)
 974 {
 975         struct ib_uverbs_req_notify_cq cmd;
 976         struct ib_cq                  *cq;
 977
 978         if (copy_from_user(&cmd, buf, sizeof cmd))
 979                 return -EFAULT;
 980
 981         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
 982         if (!cq)
 983                 return -EINVAL;
 984
 985         ib_req_notify_cq(cq, cmd.solicited_only ?
 986                          IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
 987
 988         put_cq_read(cq);
 989
 990         return in_len;
 991 }
 992
 993 ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
 994                              const char __user *buf, int in_len,
 995                              int out_len)
 996 {
 997         struct ib_uverbs_destroy_cq      cmd;
 998         struct ib_uverbs_destroy_cq_resp resp;
 999         struct ib_uobject               *uobj;
1000         struct ib_cq                    *cq;
1001         struct ib_ucq_object            *obj;
1002         struct ib_uverbs_event_file     *ev_file;
1003         int                              ret = -EINVAL;
1004
1005         if (copy_from_user(&cmd, buf, sizeof cmd))
1006                 return -EFAULT;
1007
1008         uobj = idr_write_uobj(&ib_uverbs_cq_idr, cmd.cq_handle, file->ucontext);
1009         if (!uobj)
1010                 return -EINVAL;
1011         cq      = uobj->object;
1012         ev_file = cq->cq_context;
1013         obj     = container_of(cq->uobject, struct ib_ucq_object, uobject);
1014
1015         ret = ib_destroy_cq(cq);
1016         if (!ret)
1017                 uobj->live = 0;
1018
1019         put_uobj_write(uobj);
1020
1021         if (ret)
1022                 return ret;
1023
1024         idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
1025
1026         mutex_lock(&file->mutex);
1027         list_del(&uobj->list);
1028         mutex_unlock(&file->mutex);
1029
1030         ib_uverbs_release_ucq(file, ev_file, obj);
1031
1032         memset(&resp, 0, sizeof resp);
1033         resp.comp_events_reported  = obj->comp_events_reported;
1034         resp.async_events_reported = obj->async_events_reported;
1035
1036         put_uobj(uobj);
1037
1038         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1039                          &resp, sizeof resp))
1040                 return -EFAULT;
1041
1042         return in_len;
1043 }
1044
1045 ssize_t ib_uverbs_create_qp(struct ib_uverbs_file *file,
1046                             const char __user *buf, int in_len,
1047                             int out_len)
1048 {
1049         struct ib_uverbs_create_qp      cmd;
1050         struct ib_uverbs_create_qp_resp resp;
1051         struct ib_udata                 udata;
1052         struct ib_uqp_object           *obj;
1053         struct ib_pd                   *pd;
1054         struct ib_cq                   *scq, *rcq;
1055         struct ib_srq                  *srq;
1056         struct ib_qp                   *qp;
1057         struct ib_qp_init_attr          attr;
1058         int ret;
1059
1060         if (out_len < sizeof resp)
1061                 return -ENOSPC;
1062
1063         if (copy_from_user(&cmd, buf, sizeof cmd))
1064                 return -EFAULT;
1065
1066         INIT_UDATA(&udata, buf + sizeof cmd,
1067                    (unsigned long) cmd.response + sizeof resp,
1068                    in_len - sizeof cmd, out_len - sizeof resp);
1069
1070         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1071         if (!obj)
1072                 return -ENOMEM;
1073
1074         init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_key);
1075         down_write(&obj->uevent.uobject.mutex);
1076
1077         srq = cmd.is_srq ? idr_read_srq(cmd.srq_handle, file->ucontext) : NULL;
1078         pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
1079         scq = idr_read_cq(cmd.send_cq_handle, file->ucontext, 0);
1080         rcq = cmd.recv_cq_handle == cmd.send_cq_handle ?
1081                 scq : idr_read_cq(cmd.recv_cq_handle, file->ucontext, 1);
1082
1083         if (!pd || !scq || !rcq || (cmd.is_srq && !srq)) {
1084                 ret = -EINVAL;
1085                 goto err_put;
1086         }
1087
1088         attr.event_handler = ib_uverbs_qp_event_handler;
1089         attr.qp_context    = file;
1090         attr.send_cq       = scq;
1091         attr.recv_cq       = rcq;
1092         attr.srq           = srq;
1093         attr.sq_sig_type   = cmd.sq_sig_all ? IB_SIGNAL_ALL_WR : IB_SIGNAL_REQ_WR;
1094         attr.qp_type       = cmd.qp_type;
1095         attr.create_flags  = 0;
1096
1097         attr.cap.max_send_wr     = cmd.max_send_wr;
1098         attr.cap.max_recv_wr     = cmd.max_recv_wr;
1099         attr.cap.max_send_sge    = cmd.max_send_sge;
1100         attr.cap.max_recv_sge    = cmd.max_recv_sge;
1101         attr.cap.max_inline_data = cmd.max_inline_data;
1102
1103         obj->uevent.events_reported     = 0;
1104         INIT_LIST_HEAD(&obj->uevent.event_list);
1105         INIT_LIST_HEAD(&obj->mcast_list);
1106
1107         qp = pd->device->create_qp(pd, &attr, &udata);
1108         if (IS_ERR(qp)) {
1109                 ret = PTR_ERR(qp);
1110                 goto err_put;
1111         }
1112
1113         qp->device        = pd->device;
1114         qp->pd            = pd;
1115         qp->send_cq       = attr.send_cq;
1116         qp->recv_cq       = attr.recv_cq;
1117         qp->srq           = attr.srq;
1118         qp->uobject       = &obj->uevent.uobject;
1119         qp->event_handler = attr.event_handler;
1120         qp->qp_context    = attr.qp_context;
1121         qp->qp_type       = attr.qp_type;
1122         atomic_inc(&pd->usecnt);
1123         atomic_inc(&attr.send_cq->usecnt);
1124         atomic_inc(&attr.recv_cq->usecnt);
1125         if (attr.srq)
1126                 atomic_inc(&attr.srq->usecnt);
1127
1128         obj->uevent.uobject.object = qp;
1129         ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1130         if (ret)
1131                 goto err_destroy;
1132
1133         memset(&resp, 0, sizeof resp);
1134         resp.qpn             = qp->qp_num;
1135         resp.qp_handle       = obj->uevent.uobject.id;
1136         resp.max_recv_sge    = attr.cap.max_recv_sge;
1137         resp.max_send_sge    = attr.cap.max_send_sge;
1138         resp.max_recv_wr     = attr.cap.max_recv_wr;
1139         resp.max_send_wr     = attr.cap.max_send_wr;
1140         resp.max_inline_data = attr.cap.max_inline_data;
1141
1142         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1143                          &resp, sizeof resp)) {
1144                 ret = -EFAULT;
1145                 goto err_copy;
1146         }
1147
1148         put_pd_read(pd);
1149         put_cq_read(scq);
1150         if (rcq != scq)
1151                 put_cq_read(rcq);
1152         if (srq)
1153                 put_srq_read(srq);
1154
1155         mutex_lock(&file->mutex);
1156         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1157         mutex_unlock(&file->mutex);
1158
1159         obj->uevent.uobject.live = 1;
1160
1161         up_write(&obj->uevent.uobject.mutex);
1162
1163         return in_len;
1164
1165 err_copy:
1166         idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1167
1168 err_destroy:
1169         ib_destroy_qp(qp);
1170
1171 err_put:
1172         if (pd)
1173                 put_pd_read(pd);
1174         if (scq)
1175                 put_cq_read(scq);
1176         if (rcq && rcq != scq)
1177                 put_cq_read(rcq);
1178         if (srq)
1179                 put_srq_read(srq);
1180
1181         put_uobj_write(&obj->uevent.uobject);
1182         return ret;
1183 }
1184
1185 ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
1186                            const char __user *buf, int in_len,
1187                            int out_len)
1188 {
1189         struct ib_uverbs_query_qp      cmd;
1190         struct ib_uverbs_query_qp_resp resp;
1191         struct ib_qp                   *qp;
1192         struct ib_qp_attr              *attr;
1193         struct ib_qp_init_attr         *init_attr;
1194         int                            ret;
1195
1196         if (copy_from_user(&cmd, buf, sizeof cmd))
1197                 return -EFAULT;
1198
1199         attr      = kmalloc(sizeof *attr, GFP_KERNEL);
1200         init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
1201         if (!attr || !init_attr) {
1202                 ret = -ENOMEM;
1203                 goto out;
1204         }
1205
1206         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1207         if (!qp) {
1208                 ret = -EINVAL;
1209                 goto out;
1210         }
1211
1212         ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
1213
1214         put_qp_read(qp);
1215
1216         if (ret)
1217                 goto out;
1218
1219         memset(&resp, 0, sizeof resp);
1220
1221         resp.qp_state               = attr->qp_state;
1222         resp.cur_qp_state           = attr->cur_qp_state;
1223         resp.path_mtu               = attr->path_mtu;
1224         resp.path_mig_state         = attr->path_mig_state;
1225         resp.qkey                   = attr->qkey;
1226         resp.rq_psn                 = attr->rq_psn;
1227         resp.sq_psn                 = attr->sq_psn;
1228         resp.dest_qp_num            = attr->dest_qp_num;
1229         resp.qp_access_flags        = attr->qp_access_flags;
1230         resp.pkey_index             = attr->pkey_index;
1231         resp.alt_pkey_index         = attr->alt_pkey_index;
1232         resp.sq_draining            = attr->sq_draining;
1233         resp.max_rd_atomic          = attr->max_rd_atomic;
1234         resp.max_dest_rd_atomic     = attr->max_dest_rd_atomic;
1235         resp.min_rnr_timer          = attr->min_rnr_timer;
1236         resp.port_num               = attr->port_num;
1237         resp.timeout                = attr->timeout;
1238         resp.retry_cnt              = attr->retry_cnt;
1239         resp.rnr_retry              = attr->rnr_retry;
1240         resp.alt_port_num           = attr->alt_port_num;
1241         resp.alt_timeout            = attr->alt_timeout;
1242
1243         memcpy(resp.dest.dgid, attr->ah_attr.grh.dgid.raw, 16);
1244         resp.dest.flow_label        = attr->ah_attr.grh.flow_label;
1245         resp.dest.sgid_index        = attr->ah_attr.grh.sgid_index;
1246         resp.dest.hop_limit         = attr->ah_attr.grh.hop_limit;
1247         resp.dest.traffic_class     = attr->ah_attr.grh.traffic_class;
1248         resp.dest.dlid              = attr->ah_attr.dlid;
1249         resp.dest.sl                = attr->ah_attr.sl;
1250         resp.dest.src_path_bits     = attr->ah_attr.src_path_bits;
1251         resp.dest.static_rate       = attr->ah_attr.static_rate;
1252         resp.dest.is_global         = !!(attr->ah_attr.ah_flags & IB_AH_GRH);
1253         resp.dest.port_num          = attr->ah_attr.port_num;
1254
1255         memcpy(resp.alt_dest.dgid, attr->alt_ah_attr.grh.dgid.raw, 16);
1256         resp.alt_dest.flow_label    = attr->alt_ah_attr.grh.flow_label;
1257         resp.alt_dest.sgid_index    = attr->alt_ah_attr.grh.sgid_index;
1258         resp.alt_dest.hop_limit     = attr->alt_ah_attr.grh.hop_limit;
1259         resp.alt_dest.traffic_class = attr->alt_ah_attr.grh.traffic_class;
1260         resp.alt_dest.dlid          = attr->alt_ah_attr.dlid;
1261         resp.alt_dest.sl            = attr->alt_ah_attr.sl;
1262         resp.alt_dest.src_path_bits = attr->alt_ah_attr.src_path_bits;
1263         resp.alt_dest.static_rate   = attr->alt_ah_attr.static_rate;
1264         resp.alt_dest.is_global     = !!(attr->alt_ah_attr.ah_flags & IB_AH_GRH);
1265         resp.alt_dest.port_num      = attr->alt_ah_attr.port_num;
1266
1267         resp.max_send_wr            = init_attr->cap.max_send_wr;
1268         resp.max_recv_wr            = init_attr->cap.max_recv_wr;
1269         resp.max_send_sge           = init_attr->cap.max_send_sge;
1270         resp.max_recv_sge           = init_attr->cap.max_recv_sge;
1271         resp.max_inline_data        = init_attr->cap.max_inline_data;
1272         resp.sq_sig_all             = init_attr->sq_sig_type == IB_SIGNAL_ALL_WR;
1273
1274         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1275                          &resp, sizeof resp))
1276                 ret = -EFAULT;
1277
1278 out:
1279         kfree(attr);
1280         kfree(init_attr);
1281
1282         return ret ? ret : in_len;
1283 }
1284
1285 ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file,
1286                             const char __user *buf, int in_len,
1287                             int out_len)
1288 {
1289         struct ib_uverbs_modify_qp cmd;
1290         struct ib_udata            udata;
1291         struct ib_qp              *qp;
1292         struct ib_qp_attr         *attr;
1293         int                        ret;
1294
1295         if (copy_from_user(&cmd, buf, sizeof cmd))
1296                 return -EFAULT;
1297
1298         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
1299                    out_len);
1300
1301         attr = kmalloc(sizeof *attr, GFP_KERNEL);
1302         if (!attr)
1303                 return -ENOMEM;
1304
1305         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1306         if (!qp) {
1307                 ret = -EINVAL;
1308                 goto out;
1309         }
1310
1311         attr->qp_state            = cmd.qp_state;
1312         attr->cur_qp_state        = cmd.cur_qp_state;
1313         attr->path_mtu            = cmd.path_mtu;
1314         attr->path_mig_state      = cmd.path_mig_state;
1315         attr->qkey                = cmd.qkey;
1316         attr->rq_psn              = cmd.rq_psn;
1317         attr->sq_psn              = cmd.sq_psn;
1318         attr->dest_qp_num         = cmd.dest_qp_num;
1319         attr->qp_access_flags     = cmd.qp_access_flags;
1320         attr->pkey_index          = cmd.pkey_index;
1321         attr->alt_pkey_index      = cmd.alt_pkey_index;
1322         attr->en_sqd_async_notify = cmd.en_sqd_async_notify;
1323         attr->max_rd_atomic       = cmd.max_rd_atomic;
1324         attr->max_dest_rd_atomic  = cmd.max_dest_rd_atomic;
1325         attr->min_rnr_timer       = cmd.min_rnr_timer;
1326         attr->port_num            = cmd.port_num;
1327         attr->timeout             = cmd.timeout;
1328         attr->retry_cnt           = cmd.retry_cnt;
1329         attr->rnr_retry           = cmd.rnr_retry;
1330         attr->alt_port_num        = cmd.alt_port_num;
1331         attr->alt_timeout         = cmd.alt_timeout;
1332
1333         memcpy(attr->ah_attr.grh.dgid.raw, cmd.dest.dgid, 16);
1334         attr->ah_attr.grh.flow_label        = cmd.dest.flow_label;
1335         attr->ah_attr.grh.sgid_index        = cmd.dest.sgid_index;
1336         attr->ah_attr.grh.hop_limit         = cmd.dest.hop_limit;
1337         attr->ah_attr.grh.traffic_class     = cmd.dest.traffic_class;
1338         attr->ah_attr.dlid                  = cmd.dest.dlid;
1339         attr->ah_attr.sl                    = cmd.dest.sl;
1340         attr->ah_attr.src_path_bits         = cmd.dest.src_path_bits;
1341         attr->ah_attr.static_rate           = cmd.dest.static_rate;
1342         attr->ah_attr.ah_flags              = cmd.dest.is_global ? IB_AH_GRH : 0;
1343         attr->ah_attr.port_num              = cmd.dest.port_num;
1344
1345         memcpy(attr->alt_ah_attr.grh.dgid.raw, cmd.alt_dest.dgid, 16);
1346         attr->alt_ah_attr.grh.flow_label    = cmd.alt_dest.flow_label;
1347         attr->alt_ah_attr.grh.sgid_index    = cmd.alt_dest.sgid_index;
1348         attr->alt_ah_attr.grh.hop_limit     = cmd.alt_dest.hop_limit;
1349         attr->alt_ah_attr.grh.traffic_class = cmd.alt_dest.traffic_class;
1350         attr->alt_ah_attr.dlid              = cmd.alt_dest.dlid;
1351         attr->alt_ah_attr.sl                = cmd.alt_dest.sl;
1352         attr->alt_ah_attr.src_path_bits     = cmd.alt_dest.src_path_bits;
1353         attr->alt_ah_attr.static_rate       = cmd.alt_dest.static_rate;
1354         attr->alt_ah_attr.ah_flags          = cmd.alt_dest.is_global ? IB_AH_GRH : 0;
1355         attr->alt_ah_attr.port_num          = cmd.alt_dest.port_num;
1356
1357         ret = qp->device->modify_qp(qp, attr, cmd.attr_mask, &udata);
1358
1359         put_qp_read(qp);
1360
1361         if (ret)
1362                 goto out;
1363
1364         ret = in_len;
1365
1366 out:
1367         kfree(attr);
1368
1369         return ret;
1370 }
1371
1372 ssize_t ib_uverbs_destroy_qp(struct ib_uverbs_file *file,
1373                              const char __user *buf, int in_len,
1374                              int out_len)
1375 {
1376         struct ib_uverbs_destroy_qp      cmd;
1377         struct ib_uverbs_destroy_qp_resp resp;
1378         struct ib_uobject               *uobj;
1379         struct ib_qp                    *qp;
1380         struct ib_uqp_object            *obj;
1381         int                              ret = -EINVAL;
1382
1383         if (copy_from_user(&cmd, buf, sizeof cmd))
1384                 return -EFAULT;
1385
1386         memset(&resp, 0, sizeof resp);
1387
1388         uobj = idr_write_uobj(&ib_uverbs_qp_idr, cmd.qp_handle, file->ucontext);
1389         if (!uobj)
1390                 return -EINVAL;
1391         qp  = uobj->object;
1392         obj = container_of(uobj, struct ib_uqp_object, uevent.uobject);
1393
1394         if (!list_empty(&obj->mcast_list)) {
1395                 put_uobj_write(uobj);
1396                 return -EBUSY;
1397         }
1398
1399         ret = ib_destroy_qp(qp);
1400         if (!ret)
1401                 uobj->live = 0;
1402
1403         put_uobj_write(uobj);
1404
1405         if (ret)
1406                 return ret;
1407
1408         idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
1409
1410         mutex_lock(&file->mutex);
1411         list_del(&uobj->list);
1412         mutex_unlock(&file->mutex);
1413
1414         ib_uverbs_release_uevent(file, &obj->uevent);
1415
1416         resp.events_reported = obj->uevent.events_reported;
1417
1418         put_uobj(uobj);
1419
1420         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1421                          &resp, sizeof resp))
1422                 return -EFAULT;
1423
1424         return in_len;
1425 }
1426
1427 ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
1428                             const char __user *buf, int in_len,
1429                             int out_len)
1430 {
1431         struct ib_uverbs_post_send      cmd;
1432         struct ib_uverbs_post_send_resp resp;
1433         struct ib_uverbs_send_wr       *user_wr;
1434         struct ib_send_wr              *wr = NULL, *last, *next, *bad_wr;
1435         struct ib_qp                   *qp;
1436         int                             i, sg_ind;
1437         int                             is_ud;
1438         ssize_t                         ret = -EINVAL;
1439
1440         if (copy_from_user(&cmd, buf, sizeof cmd))
1441                 return -EFAULT;
1442
1443         if (in_len < sizeof cmd + cmd.wqe_size * cmd.wr_count +
1444             cmd.sge_count * sizeof (struct ib_uverbs_sge))
1445                 return -EINVAL;
1446
1447         if (cmd.wqe_size < sizeof (struct ib_uverbs_send_wr))
1448                 return -EINVAL;
1449
1450         user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL);
1451         if (!user_wr)
1452                 return -ENOMEM;
1453
1454         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1455         if (!qp)
1456                 goto out;
1457
1458         is_ud = qp->qp_type == IB_QPT_UD;
1459         sg_ind = 0;
1460         last = NULL;
1461         for (i = 0; i < cmd.wr_count; ++i) {
1462                 if (copy_from_user(user_wr,
1463                                    buf + sizeof cmd + i * cmd.wqe_size,
1464                                    cmd.wqe_size)) {
1465                         ret = -EFAULT;
1466                         goto out_put;
1467                 }
1468
1469                 if (user_wr->num_sge + sg_ind > cmd.sge_count) {
1470                         ret = -EINVAL;
1471                         goto out_put;
1472                 }
1473
1474                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
1475                                user_wr->num_sge * sizeof (struct ib_sge),
1476                                GFP_KERNEL);
1477                 if (!next) {
1478                         ret = -ENOMEM;
1479                         goto out_put;
1480                 }
1481
1482                 if (!last)
1483                         wr = next;
1484                 else
1485                         last->next = next;
1486                 last = next;
1487
1488                 next->next       = NULL;
1489                 next->wr_id      = user_wr->wr_id;
1490                 next->num_sge    = user_wr->num_sge;
1491                 next->opcode     = user_wr->opcode;
1492                 next->send_flags = user_wr->send_flags;
1493
1494                 if (is_ud) {
1495                         next->wr.ud.ah = idr_read_ah(user_wr->wr.ud.ah,
1496                                                      file->ucontext);
1497                         if (!next->wr.ud.ah) {
1498                                 ret = -EINVAL;
1499                                 goto out_put;
1500                         }
1501                         next->wr.ud.remote_qpn  = user_wr->wr.ud.remote_qpn;
1502                         next->wr.ud.remote_qkey = user_wr->wr.ud.remote_qkey;
1503                 } else {
1504                         switch (next->opcode) {
1505                         case IB_WR_RDMA_WRITE_WITH_IMM:
1506                                 next->ex.imm_data =
1507                                         (__be32 __force) user_wr->ex.imm_data;
1508                         case IB_WR_RDMA_WRITE:
1509                         case IB_WR_RDMA_READ:
1510                                 next->wr.rdma.remote_addr =
1511                                         user_wr->wr.rdma.remote_addr;
1512                                 next->wr.rdma.rkey        =
1513                                         user_wr->wr.rdma.rkey;
1514                                 break;
1515                         case IB_WR_SEND_WITH_IMM:
1516                                 next->ex.imm_data =
1517                                         (__be32 __force) user_wr->ex.imm_data;
1518                                 break;
1519                         case IB_WR_SEND_WITH_INV:
1520                                 next->ex.invalidate_rkey =
1521                                         user_wr->ex.invalidate_rkey;
1522                                 break;
1523                         case IB_WR_ATOMIC_CMP_AND_SWP:
1524                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1525                                 next->wr.atomic.remote_addr =
1526                                         user_wr->wr.atomic.remote_addr;
1527                                 next->wr.atomic.compare_add =
1528                                         user_wr->wr.atomic.compare_add;
1529                                 next->wr.atomic.swap = user_wr->wr.atomic.swap;
1530                                 next->wr.atomic.rkey = user_wr->wr.atomic.rkey;
1531                                 break;
1532                         default:
1533                                 break;
1534                         }
1535                 }
1536
1537                 if (next->num_sge) {
1538                         next->sg_list = (void *) next +
1539                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
1540                         if (copy_from_user(next->sg_list,
1541                                            buf + sizeof cmd +
1542                                            cmd.wr_count * cmd.wqe_size +
1543                                            sg_ind * sizeof (struct ib_sge),
1544                                            next->num_sge * sizeof (struct ib_sge))) {
1545                                 ret = -EFAULT;
1546                                 goto out_put;
1547                         }
1548                         sg_ind += next->num_sge;
1549                 } else
1550                         next->sg_list = NULL;
1551         }
1552
1553         resp.bad_wr = 0;
1554         ret = qp->device->post_send(qp, wr, &bad_wr);
1555         if (ret)
1556                 for (next = wr; next; next = next->next) {
1557                         ++resp.bad_wr;
1558                         if (next == bad_wr)
1559                                 break;
1560                 }
1561
1562         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1563                          &resp, sizeof resp))
1564                 ret = -EFAULT;
1565
1566 out_put:
1567         put_qp_read(qp);
1568
1569         while (wr) {
1570                 if (is_ud && wr->wr.ud.ah)
1571                         put_ah_read(wr->wr.ud.ah);
1572                 next = wr->next;
1573                 kfree(wr);
1574                 wr = next;
1575         }
1576
1577 out:
1578         kfree(user_wr);
1579
1580         return ret ? ret : in_len;
1581 }
1582
1583 static struct ib_recv_wr *ib_uverbs_unmarshall_recv(const char __user *buf,
1584                                                     int in_len,
1585                                                     u32 wr_count,
1586                                                     u32 sge_count,
1587                                                     u32 wqe_size)
1588 {
1589         struct ib_uverbs_recv_wr *user_wr;
1590         struct ib_recv_wr        *wr = NULL, *last, *next;
1591         int                       sg_ind;
1592         int                       i;
1593         int                       ret;
1594
1595         if (in_len < wqe_size * wr_count +
1596             sge_count * sizeof (struct ib_uverbs_sge))
1597                 return ERR_PTR(-EINVAL);
1598
1599         if (wqe_size < sizeof (struct ib_uverbs_recv_wr))
1600                 return ERR_PTR(-EINVAL);
1601
1602         user_wr = kmalloc(wqe_size, GFP_KERNEL);
1603         if (!user_wr)
1604                 return ERR_PTR(-ENOMEM);
1605
1606         sg_ind = 0;
1607         last = NULL;
1608         for (i = 0; i < wr_count; ++i) {
1609                 if (copy_from_user(user_wr, buf + i * wqe_size,
1610                                    wqe_size)) {
1611                         ret = -EFAULT;
1612                         goto err;
1613                 }
1614
1615                 if (user_wr->num_sge + sg_ind > sge_count) {
1616                         ret = -EINVAL;
1617                         goto err;
1618                 }
1619
1620                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
1621                                user_wr->num_sge * sizeof (struct ib_sge),
1622                                GFP_KERNEL);
1623                 if (!next) {
1624                         ret = -ENOMEM;
1625                         goto err;
1626                 }
1627
1628                 if (!last)
1629                         wr = next;
1630                 else
1631                         last->next = next;
1632                 last = next;
1633
1634                 next->next       = NULL;
1635                 next->wr_id      = user_wr->wr_id;
1636                 next->num_sge    = user_wr->num_sge;
1637
1638                 if (next->num_sge) {
1639                         next->sg_list = (void *) next +
1640                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
1641                         if (copy_from_user(next->sg_list,
1642                                            buf + wr_count * wqe_size +
1643                                            sg_ind * sizeof (struct ib_sge),
1644                                            next->num_sge * sizeof (struct ib_sge))) {
1645                                 ret = -EFAULT;
1646                                 goto err;
1647                         }
1648                         sg_ind += next->num_sge;
1649                 } else
1650                         next->sg_list = NULL;
1651         }
1652
1653         kfree(user_wr);
1654         return wr;
1655
1656 err:
1657         kfree(user_wr);
1658
1659         while (wr) {
1660                 next = wr->next;
1661                 kfree(wr);
1662                 wr = next;
1663         }
1664
1665         return ERR_PTR(ret);
1666 }
1667
1668 ssize_t ib_uverbs_post_recv(struct ib_uverbs_file *file,
1669                             const char __user *buf, int in_len,
1670                             int out_len)
1671 {
1672         struct ib_uverbs_post_recv      cmd;
1673         struct ib_uverbs_post_recv_resp resp;
1674         struct ib_recv_wr              *wr, *next, *bad_wr;
1675         struct ib_qp                   *qp;
1676         ssize_t                         ret = -EINVAL;
1677
1678         if (copy_from_user(&cmd, buf, sizeof cmd))
1679                 return -EFAULT;
1680
1681         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
1682                                        in_len - sizeof cmd, cmd.wr_count,
1683                                        cmd.sge_count, cmd.wqe_size);
1684         if (IS_ERR(wr))
1685                 return PTR_ERR(wr);
1686
1687         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1688         if (!qp)
1689                 goto out;
1690
1691         resp.bad_wr = 0;
1692         ret = qp->device->post_recv(qp, wr, &bad_wr);
1693
1694         put_qp_read(qp);
1695
1696         if (ret)
1697                 for (next = wr; next; next = next->next) {
1698                         ++resp.bad_wr;
1699                         if (next == bad_wr)
1700                                 break;
1701                 }
1702
1703         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1704                          &resp, sizeof resp))
1705                 ret = -EFAULT;
1706
1707 out:
1708         while (wr) {
1709                 next = wr->next;
1710                 kfree(wr);
1711                 wr = next;
1712         }
1713
1714         return ret ? ret : in_len;
1715 }
1716
1717 ssize_t ib_uverbs_post_srq_recv(struct ib_uverbs_file *file,
1718                                 const char __user *buf, int in_len,
1719                                 int out_len)
1720 {
1721         struct ib_uverbs_post_srq_recv      cmd;
1722         struct ib_uverbs_post_srq_recv_resp resp;
1723         struct ib_recv_wr                  *wr, *next, *bad_wr;
1724         struct ib_srq                      *srq;
1725         ssize_t                             ret = -EINVAL;
1726
1727         if (copy_from_user(&cmd, buf, sizeof cmd))
1728                 return -EFAULT;
1729
1730         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
1731                                        in_len - sizeof cmd, cmd.wr_count,
1732                                        cmd.sge_count, cmd.wqe_size);
1733         if (IS_ERR(wr))
1734                 return PTR_ERR(wr);
1735
1736         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
1737         if (!srq)
1738                 goto out;
1739
1740         resp.bad_wr = 0;
1741         ret = srq->device->post_srq_recv(srq, wr, &bad_wr);
1742
1743         put_srq_read(srq);
1744
1745         if (ret)
1746                 for (next = wr; next; next = next->next) {
1747                         ++resp.bad_wr;
1748                         if (next == bad_wr)
1749                                 break;
1750                 }
1751
1752         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1753                          &resp, sizeof resp))
1754                 ret = -EFAULT;
1755
1756 out:
1757         while (wr) {
1758                 next = wr->next;
1759                 kfree(wr);
1760                 wr = next;
1761         }
1762
1763         return ret ? ret : in_len;
1764 }
1765
1766 ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
1767                             const char __user *buf, int in_len,
1768                             int out_len)
1769 {
1770         struct ib_uverbs_create_ah       cmd;
1771         struct ib_uverbs_create_ah_resp  resp;
1772         struct ib_uobject               *uobj;
1773         struct ib_pd                    *pd;
1774         struct ib_ah                    *ah;
1775         struct ib_ah_attr               attr;
1776         int ret;
1777
1778         if (out_len < sizeof resp)
1779                 return -ENOSPC;
1780
1781         if (copy_from_user(&cmd, buf, sizeof cmd))
1782                 return -EFAULT;
1783
1784         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
1785         if (!uobj)
1786                 return -ENOMEM;
1787
1788         init_uobj(uobj, cmd.user_handle, file->ucontext, &ah_lock_key);
1789         down_write(&uobj->mutex);
1790
1791         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
1792         if (!pd) {
1793                 ret = -EINVAL;
1794                 goto err;
1795         }
1796
1797         attr.dlid              = cmd.attr.dlid;
1798         attr.sl                = cmd.attr.sl;
1799         attr.src_path_bits     = cmd.attr.src_path_bits;
1800         attr.static_rate       = cmd.attr.static_rate;
1801         attr.ah_flags          = cmd.attr.is_global ? IB_AH_GRH : 0;
1802         attr.port_num          = cmd.attr.port_num;
1803         attr.grh.flow_label    = cmd.attr.grh.flow_label;
1804         attr.grh.sgid_index    = cmd.attr.grh.sgid_index;
1805         attr.grh.hop_limit     = cmd.attr.grh.hop_limit;
1806         attr.grh.traffic_class = cmd.attr.grh.traffic_class;
1807         memcpy(attr.grh.dgid.raw, cmd.attr.grh.dgid, 16);
1808
1809         ah = ib_create_ah(pd, &attr);
1810         if (IS_ERR(ah)) {
1811                 ret = PTR_ERR(ah);
1812                 goto err_put;
1813         }
1814
1815         ah->uobject  = uobj;
1816         uobj->object = ah;
1817
1818         ret = idr_add_uobj(&ib_uverbs_ah_idr, uobj);
1819         if (ret)
1820                 goto err_destroy;
1821
1822         resp.ah_handle = uobj->id;
1823
1824         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1825                          &resp, sizeof resp)) {
1826                 ret = -EFAULT;
1827                 goto err_copy;
1828         }
1829
1830         put_pd_read(pd);
1831
1832         mutex_lock(&file->mutex);
1833         list_add_tail(&uobj->list, &file->ucontext->ah_list);
1834         mutex_unlock(&file->mutex);
1835
1836         uobj->live = 1;
1837
1838         up_write(&uobj->mutex);
1839
1840         return in_len;
1841
1842 err_copy:
1843         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
1844
1845 err_destroy:
1846         ib_destroy_ah(ah);
1847
1848 err_put:
1849         put_pd_read(pd);
1850
1851 err:
1852         put_uobj_write(uobj);
1853         return ret;
1854 }
1855
1856 ssize_t ib_uverbs_destroy_ah(struct ib_uverbs_file *file,
1857                              const char __user *buf, int in_len, int out_len)
1858 {
1859         struct ib_uverbs_destroy_ah cmd;
1860         struct ib_ah               *ah;
1861         struct ib_uobject          *uobj;
1862         int                         ret;
1863
1864         if (copy_from_user(&cmd, buf, sizeof cmd))
1865                 return -EFAULT;
1866
1867         uobj = idr_write_uobj(&ib_uverbs_ah_idr, cmd.ah_handle, file->ucontext);
1868         if (!uobj)
1869                 return -EINVAL;
1870         ah = uobj->object;
1871
1872         ret = ib_destroy_ah(ah);
1873         if (!ret)
1874                 uobj->live = 0;
1875
1876         put_uobj_write(uobj);
1877
1878         if (ret)
1879                 return ret;
1880
1881         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
1882
1883         mutex_lock(&file->mutex);
1884         list_del(&uobj->list);
1885         mutex_unlock(&file->mutex);
1886
1887         put_uobj(uobj);
1888
1889         return in_len;
1890 }
1891
1892 ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
1893                                const char __user *buf, int in_len,
1894                                int out_len)
1895 {
1896         struct ib_uverbs_attach_mcast cmd;
1897         struct ib_qp                 *qp;
1898         struct ib_uqp_object         *obj;
1899         struct ib_uverbs_mcast_entry *mcast;
1900         int                           ret;
1901
1902         if (copy_from_user(&cmd, buf, sizeof cmd))
1903                 return -EFAULT;
1904
1905         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1906         if (!qp)
1907                 return -EINVAL;
1908
1909         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
1910
1911         list_for_each_entry(mcast, &obj->mcast_list, list)
1912                 if (cmd.mlid == mcast->lid &&
1913                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
1914                         ret = 0;
1915                         goto out_put;
1916                 }
1917
1918         mcast = kmalloc(sizeof *mcast, GFP_KERNEL);
1919         if (!mcast) {
1920                 ret = -ENOMEM;
1921                 goto out_put;
1922         }
1923
1924         mcast->lid = cmd.mlid;
1925         memcpy(mcast->gid.raw, cmd.gid, sizeof mcast->gid.raw);
1926
1927         ret = ib_attach_mcast(qp, &mcast->gid, cmd.mlid);
1928         if (!ret)
1929                 list_add_tail(&mcast->list, &obj->mcast_list);
1930         else
1931                 kfree(mcast);
1932
1933 out_put:
1934         put_qp_read(qp);
1935
1936         return ret ? ret : in_len;
1937 }
1938
1939 ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
1940                                const char __user *buf, int in_len,
1941                                int out_len)
1942 {
1943         struct ib_uverbs_detach_mcast cmd;
1944         struct ib_uqp_object         *obj;
1945         struct ib_qp                 *qp;
1946         struct ib_uverbs_mcast_entry *mcast;
1947         int                           ret = -EINVAL;
1948
1949         if (copy_from_user(&cmd, buf, sizeof cmd))
1950                 return -EFAULT;
1951
1952         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1953         if (!qp)
1954                 return -EINVAL;
1955
1956         ret = ib_detach_mcast(qp, (union ib_gid *) cmd.gid, cmd.mlid);
1957         if (ret)
1958                 goto out_put;
1959
1960         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
1961
1962         list_for_each_entry(mcast, &obj->mcast_list, list)
1963                 if (cmd.mlid == mcast->lid &&
1964                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
1965                         list_del(&mcast->list);
1966                         kfree(mcast);
1967                         break;
1968                 }
1969
1970 out_put:
1971         put_qp_read(qp);
1972
1973         return ret ? ret : in_len;
1974 }
1975
1976 ssize_t ib_uverbs_create_srq(struct ib_uverbs_file *file,
1977                              const char __user *buf, int in_len,
1978                              int out_len)
1979 {
1980         struct ib_uverbs_create_srq      cmd;
1981         struct ib_uverbs_create_srq_resp resp;
1982         struct ib_udata                  udata;
1983         struct ib_uevent_object         *obj;
1984         struct ib_pd                    *pd;
1985         struct ib_srq                   *srq;
1986         struct ib_srq_init_attr          attr;
1987         int ret;
1988
1989         if (out_len < sizeof resp)
1990                 return -ENOSPC;
1991
1992         if (copy_from_user(&cmd, buf, sizeof cmd))
1993                 return -EFAULT;
1994
1995         INIT_UDATA(&udata, buf + sizeof cmd,
1996                    (unsigned long) cmd.response + sizeof resp,
1997                    in_len - sizeof cmd, out_len - sizeof resp);
1998
1999         obj = kmalloc(sizeof *obj, GFP_KERNEL);
2000         if (!obj)
2001                 return -ENOMEM;
2002
2003         init_uobj(&obj->uobject, cmd.user_handle, file->ucontext, &srq_lock_key);
2004         down_write(&obj->uobject.mutex);
2005
2006         pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
2007         if (!pd) {
2008                 ret = -EINVAL;
2009                 goto err;
2010         }
2011
2012         attr.event_handler  = ib_uverbs_srq_event_handler;
2013         attr.srq_context    = file;
2014         attr.attr.max_wr    = cmd.max_wr;
2015         attr.attr.max_sge   = cmd.max_sge;
2016         attr.attr.srq_limit = cmd.srq_limit;
2017
2018         obj->events_reported     = 0;
2019         INIT_LIST_HEAD(&obj->event_list);
2020
2021         srq = pd->device->create_srq(pd, &attr, &udata);
2022         if (IS_ERR(srq)) {
2023                 ret = PTR_ERR(srq);
2024                 goto err_put;
2025         }
2026
2027         srq->device        = pd->device;
2028         srq->pd            = pd;
2029         srq->uobject       = &obj->uobject;
2030         srq->event_handler = attr.event_handler;
2031         srq->srq_context   = attr.srq_context;
2032         atomic_inc(&pd->usecnt);
2033         atomic_set(&srq->usecnt, 0);
2034
2035         obj->uobject.object = srq;
2036         ret = idr_add_uobj(&ib_uverbs_srq_idr, &obj->uobject);
2037         if (ret)
2038                 goto err_destroy;
2039
2040         memset(&resp, 0, sizeof resp);
2041         resp.srq_handle = obj->uobject.id;
2042         resp.max_wr     = attr.attr.max_wr;
2043         resp.max_sge    = attr.attr.max_sge;
2044
2045         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2046                          &resp, sizeof resp)) {
2047                 ret = -EFAULT;
2048                 goto err_copy;
2049         }
2050
2051         put_pd_read(pd);
2052
2053         mutex_lock(&file->mutex);
2054         list_add_tail(&obj->uobject.list, &file->ucontext->srq_list);
2055         mutex_unlock(&file->mutex);
2056
2057         obj->uobject.live = 1;
2058
2059         up_write(&obj->uobject.mutex);
2060
2061         return in_len;
2062
2063 err_copy:
2064         idr_remove_uobj(&ib_uverbs_srq_idr, &obj->uobject);
2065
2066 err_destroy:
2067         ib_destroy_srq(srq);
2068
2069 err_put:
2070         put_pd_read(pd);
2071
2072 err:
2073         put_uobj_write(&obj->uobject);
2074         return ret;
2075 }
2076
2077 ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
2078                              const char __user *buf, int in_len,
2079                              int out_len)
2080 {
2081         struct ib_uverbs_modify_srq cmd;
2082         struct ib_udata             udata;
2083         struct ib_srq              *srq;
2084         struct ib_srq_attr          attr;
2085         int                         ret;
2086
2087         if (copy_from_user(&cmd, buf, sizeof cmd))
2088                 return -EFAULT;
2089
2090         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
2091                    out_len);
2092
2093         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2094         if (!srq)
2095                 return -EINVAL;
2096
2097         attr.max_wr    = cmd.max_wr;
2098         attr.srq_limit = cmd.srq_limit;
2099
2100         ret = srq->device->modify_srq(srq, &attr, cmd.attr_mask, &udata);
2101
2102         put_srq_read(srq);
2103
2104         return ret ? ret : in_len;
2105 }
2106
2107 ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
2108                             const char __user *buf,
2109                             int in_len, int out_len)
2110 {
2111         struct ib_uverbs_query_srq      cmd;
2112         struct ib_uverbs_query_srq_resp resp;
2113         struct ib_srq_attr              attr;
2114         struct ib_srq                   *srq;
2115         int                             ret;
2116
2117         if (out_len < sizeof resp)
2118                 return -ENOSPC;
2119
2120         if (copy_from_user(&cmd, buf, sizeof cmd))
2121                 return -EFAULT;
2122
2123         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2124         if (!srq)
2125                 return -EINVAL;
2126
2127         ret = ib_query_srq(srq, &attr);
2128
2129         put_srq_read(srq);
2130
2131         if (ret)
2132                 return ret;
2133
2134         memset(&resp, 0, sizeof resp);
2135
2136         resp.max_wr    = attr.max_wr;
2137         resp.max_sge   = attr.max_sge;
2138         resp.srq_limit = attr.srq_limit;
2139
2140         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2141                          &resp, sizeof resp))
2142                 return -EFAULT;
2143
2144         return in_len;
2145 }
2146
2147 ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
2148                               const char __user *buf, int in_len,
2149                               int out_len)
2150 {
2151         struct ib_uverbs_destroy_srq      cmd;
2152         struct ib_uverbs_destroy_srq_resp resp;
2153         struct ib_uobject                *uobj;
2154         struct ib_srq                    *srq;
2155         struct ib_uevent_object          *obj;
2156         int                               ret = -EINVAL;
2157
2158         if (copy_from_user(&cmd, buf, sizeof cmd))
2159                 return -EFAULT;
2160
2161         uobj = idr_write_uobj(&ib_uverbs_srq_idr, cmd.srq_handle, file->ucontext);
2162         if (!uobj)
2163                 return -EINVAL;
2164         srq = uobj->object;
2165         obj = container_of(uobj, struct ib_uevent_object, uobject);
2166
2167         ret = ib_destroy_srq(srq);
2168         if (!ret)
2169                 uobj->live = 0;
2170
2171         put_uobj_write(uobj);
2172
2173         if (ret)
2174                 return ret;
2175
2176         idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
2177
2178         mutex_lock(&file->mutex);
2179         list_del(&uobj->list);
2180         mutex_unlock(&file->mutex);
2181
2182         ib_uverbs_release_uevent(file, obj);
2183
2184         memset(&resp, 0, sizeof resp);
2185         resp.events_reported = obj->events_reported;
2186
2187         put_uobj(uobj);
2188
2189         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2190                          &resp, sizeof resp))
2191                 ret = -EFAULT;
2192
2193         return ret ? ret : in_len;
2194 }