drivers/infiniband/core/uverbs_cmd.c

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