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 struct uverbs_lock_class {
  45         struct lock_class_key   key;
  46         char                    name[16];
  47 };
  48
  49 static struct uverbs_lock_class pd_lock_class   = { .name = "PD-uobj" };
  50 static struct uverbs_lock_class mr_lock_class   = { .name = "MR-uobj" };
  51 static struct uverbs_lock_class cq_lock_class   = { .name = "CQ-uobj" };
  52 static struct uverbs_lock_class qp_lock_class   = { .name = "QP-uobj" };
  53 static struct uverbs_lock_class ah_lock_class   = { .name = "AH-uobj" };
  54 static struct uverbs_lock_class srq_lock_class  = { .name = "SRQ-uobj" };
  55 static struct uverbs_lock_class xrcd_lock_class = { .name = "XRCD-uobj" };
  56
  57 #define INIT_UDATA(udata, ibuf, obuf, ilen, olen)                       \
  58         do {                                                            \
  59                 (udata)->inbuf  = (void __user *) (ibuf);               \
  60                 (udata)->outbuf = (void __user *) (obuf);               \
  61                 (udata)->inlen  = (ilen);                               \
  62                 (udata)->outlen = (olen);                               \
  63         } while (0)
  64
  65 /*
  66  * The ib_uobject locking scheme is as follows:
  67  *
  68  * - ib_uverbs_idr_lock protects the uverbs idrs themselves, so it
  69  *   needs to be held during all idr operations.  When an object is
  70  *   looked up, a reference must be taken on the object's kref before
  71  *   dropping this lock.
  72  *
  73  * - Each object also has an rwsem.  This rwsem must be held for
  74  *   reading while an operation that uses the object is performed.
  75  *   For example, while registering an MR, the associated PD's
  76  *   uobject.mutex must be held for reading.  The rwsem must be held
  77  *   for writing while initializing or destroying an object.
  78  *
  79  * - In addition, each object has a "live" flag.  If this flag is not
  80  *   set, then lookups of the object will fail even if it is found in
  81  *   the idr.  This handles a reader that blocks and does not acquire
  82  *   the rwsem until after the object is destroyed.  The destroy
  83  *   operation will set the live flag to 0 and then drop the rwsem;
  84  *   this will allow the reader to acquire the rwsem, see that the
  85  *   live flag is 0, and then drop the rwsem and its reference to
  86  *   object.  The underlying storage will not be freed until the last
  87  *   reference to the object is dropped.
  88  */
  89
  90 static void init_uobj(struct ib_uobject *uobj, u64 user_handle,
  91                       struct ib_ucontext *context, struct uverbs_lock_class *c)
  92 {
  93         uobj->user_handle = user_handle;
  94         uobj->context     = context;
  95         kref_init(&uobj->ref);
  96         init_rwsem(&uobj->mutex);
  97         lockdep_set_class_and_name(&uobj->mutex, &c->key, c->name);
  98         uobj->live        = 0;
  99 }
 100
 101 static void release_uobj(struct kref *kref)
 102 {
 103         kfree(container_of(kref, struct ib_uobject, ref));
 104 }
 105
 106 static void put_uobj(struct ib_uobject *uobj)
 107 {
 108         kref_put(&uobj->ref, release_uobj);
 109 }
 110
 111 static void put_uobj_read(struct ib_uobject *uobj)
 112 {
 113         up_read(&uobj->mutex);
 114         put_uobj(uobj);
 115 }
 116
 117 static void put_uobj_write(struct ib_uobject *uobj)
 118 {
 119         up_write(&uobj->mutex);
 120         put_uobj(uobj);
 121 }
 122
 123 static int idr_add_uobj(struct idr *idr, struct ib_uobject *uobj)
 124 {
 125         int ret;
 126
 127 retry:
 128         if (!idr_pre_get(idr, GFP_KERNEL))
 129                 return -ENOMEM;
 130
 131         spin_lock(&ib_uverbs_idr_lock);
 132         ret = idr_get_new(idr, uobj, &uobj->id);
 133         spin_unlock(&ib_uverbs_idr_lock);
 134
 135         if (ret == -EAGAIN)
 136                 goto retry;
 137
 138         return ret;
 139 }
 140
 141 void idr_remove_uobj(struct idr *idr, struct ib_uobject *uobj)
 142 {
 143         spin_lock(&ib_uverbs_idr_lock);
 144         idr_remove(idr, uobj->id);
 145         spin_unlock(&ib_uverbs_idr_lock);
 146 }
 147
 148 static struct ib_uobject *__idr_get_uobj(struct idr *idr, int id,
 149                                          struct ib_ucontext *context)
 150 {
 151         struct ib_uobject *uobj;
 152
 153         spin_lock(&ib_uverbs_idr_lock);
 154         uobj = idr_find(idr, id);
 155         if (uobj) {
 156                 if (uobj->context == context)
 157                         kref_get(&uobj->ref);
 158                 else
 159                         uobj = NULL;
 160         }
 161         spin_unlock(&ib_uverbs_idr_lock);
 162
 163         return uobj;
 164 }
 165
 166 static struct ib_uobject *idr_read_uobj(struct idr *idr, int id,
 167                                         struct ib_ucontext *context, int nested)
 168 {
 169         struct ib_uobject *uobj;
 170
 171         uobj = __idr_get_uobj(idr, id, context);
 172         if (!uobj)
 173                 return NULL;
 174
 175         if (nested)
 176                 down_read_nested(&uobj->mutex, SINGLE_DEPTH_NESTING);
 177         else
 178                 down_read(&uobj->mutex);
 179         if (!uobj->live) {
 180                 put_uobj_read(uobj);
 181                 return NULL;
 182         }
 183
 184         return uobj;
 185 }
 186
 187 static struct ib_uobject *idr_write_uobj(struct idr *idr, int id,
 188                                          struct ib_ucontext *context)
 189 {
 190         struct ib_uobject *uobj;
 191
 192         uobj = __idr_get_uobj(idr, id, context);
 193         if (!uobj)
 194                 return NULL;
 195
 196         down_write(&uobj->mutex);
 197         if (!uobj->live) {
 198                 put_uobj_write(uobj);
 199                 return NULL;
 200         }
 201
 202         return uobj;
 203 }
 204
 205 static void *idr_read_obj(struct idr *idr, int id, struct ib_ucontext *context,
 206                           int nested)
 207 {
 208         struct ib_uobject *uobj;
 209
 210         uobj = idr_read_uobj(idr, id, context, nested);
 211         return uobj ? uobj->object : NULL;
 212 }
 213
 214 static struct ib_pd *idr_read_pd(int pd_handle, struct ib_ucontext *context)
 215 {
 216         return idr_read_obj(&ib_uverbs_pd_idr, pd_handle, context, 0);
 217 }
 218
 219 static void put_pd_read(struct ib_pd *pd)
 220 {
 221         put_uobj_read(pd->uobject);
 222 }
 223
 224 static struct ib_cq *idr_read_cq(int cq_handle, struct ib_ucontext *context, int nested)
 225 {
 226         return idr_read_obj(&ib_uverbs_cq_idr, cq_handle, context, nested);
 227 }
 228
 229 static void put_cq_read(struct ib_cq *cq)
 230 {
 231         put_uobj_read(cq->uobject);
 232 }
 233
 234 static struct ib_ah *idr_read_ah(int ah_handle, struct ib_ucontext *context)
 235 {
 236         return idr_read_obj(&ib_uverbs_ah_idr, ah_handle, context, 0);
 237 }
 238
 239 static void put_ah_read(struct ib_ah *ah)
 240 {
 241         put_uobj_read(ah->uobject);
 242 }
 243
 244 static struct ib_qp *idr_read_qp(int qp_handle, struct ib_ucontext *context)
 245 {
 246         return idr_read_obj(&ib_uverbs_qp_idr, qp_handle, context, 0);
 247 }
 248
 249 static struct ib_qp *idr_write_qp(int qp_handle, struct ib_ucontext *context)
 250 {
 251         struct ib_uobject *uobj;
 252
 253         uobj = idr_write_uobj(&ib_uverbs_qp_idr, qp_handle, context);
 254         return uobj ? uobj->object : NULL;
 255 }
 256
 257 static void put_qp_read(struct ib_qp *qp)
 258 {
 259         put_uobj_read(qp->uobject);
 260 }
 261
 262 static void put_qp_write(struct ib_qp *qp)
 263 {
 264         put_uobj_write(qp->uobject);
 265 }
 266
 267 static struct ib_srq *idr_read_srq(int srq_handle, struct ib_ucontext *context)
 268 {
 269         return idr_read_obj(&ib_uverbs_srq_idr, srq_handle, context, 0);
 270 }
 271
 272 static void put_srq_read(struct ib_srq *srq)
 273 {
 274         put_uobj_read(srq->uobject);
 275 }
 276
 277 static struct ib_xrcd *idr_read_xrcd(int xrcd_handle, struct ib_ucontext *context,
 278                                      struct ib_uobject **uobj)
 279 {
 280         *uobj = idr_read_uobj(&ib_uverbs_xrcd_idr, xrcd_handle, context, 0);
 281         return *uobj ? (*uobj)->object : NULL;
 282 }
 283
 284 static void put_xrcd_read(struct ib_uobject *uobj)
 285 {
 286         put_uobj_read(uobj);
 287 }
 288
 289 ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
 290                               const char __user *buf,
 291                               int in_len, int out_len)
 292 {
 293         struct ib_uverbs_get_context      cmd;
 294         struct ib_uverbs_get_context_resp resp;
 295         struct ib_udata                   udata;
 296         struct ib_device                 *ibdev = file->device->ib_dev;
 297         struct ib_ucontext               *ucontext;
 298         struct file                      *filp;
 299         int ret;
 300
 301         if (out_len < sizeof resp)
 302                 return -ENOSPC;
 303
 304         if (copy_from_user(&cmd, buf, sizeof cmd))
 305                 return -EFAULT;
 306
 307         mutex_lock(&file->mutex);
 308
 309         if (file->ucontext) {
 310                 ret = -EINVAL;
 311                 goto err;
 312         }
 313
 314         INIT_UDATA(&udata, buf + sizeof cmd,
 315                    (unsigned long) cmd.response + sizeof resp,
 316                    in_len - sizeof cmd, out_len - sizeof resp);
 317
 318         ucontext = ibdev->alloc_ucontext(ibdev, &udata);
 319         if (IS_ERR(ucontext)) {
 320                 ret = PTR_ERR(ucontext);
 321                 goto err;
 322         }
 323
 324         ucontext->device = ibdev;
 325         INIT_LIST_HEAD(&ucontext->pd_list);
 326         INIT_LIST_HEAD(&ucontext->mr_list);
 327         INIT_LIST_HEAD(&ucontext->mw_list);
 328         INIT_LIST_HEAD(&ucontext->cq_list);
 329         INIT_LIST_HEAD(&ucontext->qp_list);
 330         INIT_LIST_HEAD(&ucontext->srq_list);
 331         INIT_LIST_HEAD(&ucontext->ah_list);
 332         INIT_LIST_HEAD(&ucontext->xrcd_list);
 333         ucontext->closing = 0;
 334
 335         resp.num_comp_vectors = file->device->num_comp_vectors;
 336
 337         ret = get_unused_fd();
 338         if (ret < 0)
 339                 goto err_free;
 340         resp.async_fd = ret;
 341
 342         filp = ib_uverbs_alloc_event_file(file, 1);
 343         if (IS_ERR(filp)) {
 344                 ret = PTR_ERR(filp);
 345                 goto err_fd;
 346         }
 347
 348         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 349                          &resp, sizeof resp)) {
 350                 ret = -EFAULT;
 351                 goto err_file;
 352         }
 353
 354         file->async_file = filp->private_data;
 355
 356         INIT_IB_EVENT_HANDLER(&file->event_handler, file->device->ib_dev,
 357                               ib_uverbs_event_handler);
 358         ret = ib_register_event_handler(&file->event_handler);
 359         if (ret)
 360                 goto err_file;
 361
 362         kref_get(&file->async_file->ref);
 363         kref_get(&file->ref);
 364         file->ucontext = ucontext;
 365
 366         fd_install(resp.async_fd, filp);
 367
 368         mutex_unlock(&file->mutex);
 369
 370         return in_len;
 371
 372 err_file:
 373         fput(filp);
 374
 375 err_fd:
 376         put_unused_fd(resp.async_fd);
 377
 378 err_free:
 379         ibdev->dealloc_ucontext(ucontext);
 380
 381 err:
 382         mutex_unlock(&file->mutex);
 383         return ret;
 384 }
 385
 386 ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
 387                                const char __user *buf,
 388                                int in_len, int out_len)
 389 {
 390         struct ib_uverbs_query_device      cmd;
 391         struct ib_uverbs_query_device_resp resp;
 392         struct ib_device_attr              attr;
 393         int                                ret;
 394
 395         if (out_len < sizeof resp)
 396                 return -ENOSPC;
 397
 398         if (copy_from_user(&cmd, buf, sizeof cmd))
 399                 return -EFAULT;
 400
 401         ret = ib_query_device(file->device->ib_dev, &attr);
 402         if (ret)
 403                 return ret;
 404
 405         memset(&resp, 0, sizeof resp);
 406
 407         resp.fw_ver                    = attr.fw_ver;
 408         resp.node_guid                 = file->device->ib_dev->node_guid;
 409         resp.sys_image_guid            = attr.sys_image_guid;
 410         resp.max_mr_size               = attr.max_mr_size;
 411         resp.page_size_cap             = attr.page_size_cap;
 412         resp.vendor_id                 = attr.vendor_id;
 413         resp.vendor_part_id            = attr.vendor_part_id;
 414         resp.hw_ver                    = attr.hw_ver;
 415         resp.max_qp                    = attr.max_qp;
 416         resp.max_qp_wr                 = attr.max_qp_wr;
 417         resp.device_cap_flags          = attr.device_cap_flags;
 418         resp.max_sge                   = attr.max_sge;
 419         resp.max_sge_rd                = attr.max_sge_rd;
 420         resp.max_cq                    = attr.max_cq;
 421         resp.max_cqe                   = attr.max_cqe;
 422         resp.max_mr                    = attr.max_mr;
 423         resp.max_pd                    = attr.max_pd;
 424         resp.max_qp_rd_atom            = attr.max_qp_rd_atom;
 425         resp.max_ee_rd_atom            = attr.max_ee_rd_atom;
 426         resp.max_res_rd_atom           = attr.max_res_rd_atom;
 427         resp.max_qp_init_rd_atom       = attr.max_qp_init_rd_atom;
 428         resp.max_ee_init_rd_atom       = attr.max_ee_init_rd_atom;
 429         resp.atomic_cap                = attr.atomic_cap;
 430         resp.max_ee                    = attr.max_ee;
 431         resp.max_rdd                   = attr.max_rdd;
 432         resp.max_mw                    = attr.max_mw;
 433         resp.max_raw_ipv6_qp           = attr.max_raw_ipv6_qp;
 434         resp.max_raw_ethy_qp           = attr.max_raw_ethy_qp;
 435         resp.max_mcast_grp             = attr.max_mcast_grp;
 436         resp.max_mcast_qp_attach       = attr.max_mcast_qp_attach;
 437         resp.max_total_mcast_qp_attach = attr.max_total_mcast_qp_attach;
 438         resp.max_ah                    = attr.max_ah;
 439         resp.max_fmr                   = attr.max_fmr;
 440         resp.max_map_per_fmr           = attr.max_map_per_fmr;
 441         resp.max_srq                   = attr.max_srq;
 442         resp.max_srq_wr                = attr.max_srq_wr;
 443         resp.max_srq_sge               = attr.max_srq_sge;
 444         resp.max_pkeys                 = attr.max_pkeys;
 445         resp.local_ca_ack_delay        = attr.local_ca_ack_delay;
 446         resp.phys_port_cnt             = file->device->ib_dev->phys_port_cnt;
 447
 448         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 449                          &resp, sizeof resp))
 450                 return -EFAULT;
 451
 452         return in_len;
 453 }
 454
 455 ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
 456                              const char __user *buf,
 457                              int in_len, int out_len)
 458 {
 459         struct ib_uverbs_query_port      cmd;
 460         struct ib_uverbs_query_port_resp resp;
 461         struct ib_port_attr              attr;
 462         int                              ret;
 463
 464         if (out_len < sizeof resp)
 465                 return -ENOSPC;
 466
 467         if (copy_from_user(&cmd, buf, sizeof cmd))
 468                 return -EFAULT;
 469
 470         ret = ib_query_port(file->device->ib_dev, cmd.port_num, &attr);
 471         if (ret)
 472                 return ret;
 473
 474         memset(&resp, 0, sizeof resp);
 475
 476         resp.state           = attr.state;
 477         resp.max_mtu         = attr.max_mtu;
 478         resp.active_mtu      = attr.active_mtu;
 479         resp.gid_tbl_len     = attr.gid_tbl_len;
 480         resp.port_cap_flags  = attr.port_cap_flags;
 481         resp.max_msg_sz      = attr.max_msg_sz;
 482         resp.bad_pkey_cntr   = attr.bad_pkey_cntr;
 483         resp.qkey_viol_cntr  = attr.qkey_viol_cntr;
 484         resp.pkey_tbl_len    = attr.pkey_tbl_len;
 485         resp.lid             = attr.lid;
 486         resp.sm_lid          = attr.sm_lid;
 487         resp.lmc             = attr.lmc;
 488         resp.max_vl_num      = attr.max_vl_num;
 489         resp.sm_sl           = attr.sm_sl;
 490         resp.subnet_timeout  = attr.subnet_timeout;
 491         resp.init_type_reply = attr.init_type_reply;
 492         resp.active_width    = attr.active_width;
 493         resp.active_speed    = attr.active_speed;
 494         resp.phys_state      = attr.phys_state;
 495         resp.link_layer      = rdma_port_get_link_layer(file->device->ib_dev,
 496                                                         cmd.port_num);
 497
 498         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 499                          &resp, sizeof resp))
 500                 return -EFAULT;
 501
 502         return in_len;
 503 }
 504
 505 ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
 506                            const char __user *buf,
 507                            int in_len, int out_len)
 508 {
 509         struct ib_uverbs_alloc_pd      cmd;
 510         struct ib_uverbs_alloc_pd_resp resp;
 511         struct ib_udata                udata;
 512         struct ib_uobject             *uobj;
 513         struct ib_pd                  *pd;
 514         int                            ret;
 515
 516         if (out_len < sizeof resp)
 517                 return -ENOSPC;
 518
 519         if (copy_from_user(&cmd, buf, sizeof cmd))
 520                 return -EFAULT;
 521
 522         INIT_UDATA(&udata, buf + sizeof cmd,
 523                    (unsigned long) cmd.response + sizeof resp,
 524                    in_len - sizeof cmd, out_len - sizeof resp);
 525
 526         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
 527         if (!uobj)
 528                 return -ENOMEM;
 529
 530         init_uobj(uobj, 0, file->ucontext, &pd_lock_class);
 531         down_write(&uobj->mutex);
 532
 533         pd = file->device->ib_dev->alloc_pd(file->device->ib_dev,
 534                                             file->ucontext, &udata);
 535         if (IS_ERR(pd)) {
 536                 ret = PTR_ERR(pd);
 537                 goto err;
 538         }
 539
 540         pd->device  = file->device->ib_dev;
 541         pd->uobject = uobj;
 542         atomic_set(&pd->usecnt, 0);
 543
 544         uobj->object = pd;
 545         ret = idr_add_uobj(&ib_uverbs_pd_idr, uobj);
 546         if (ret)
 547                 goto err_idr;
 548
 549         memset(&resp, 0, sizeof resp);
 550         resp.pd_handle = uobj->id;
 551
 552         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 553                          &resp, sizeof resp)) {
 554                 ret = -EFAULT;
 555                 goto err_copy;
 556         }
 557
 558         mutex_lock(&file->mutex);
 559         list_add_tail(&uobj->list, &file->ucontext->pd_list);
 560         mutex_unlock(&file->mutex);
 561
 562         uobj->live = 1;
 563
 564         up_write(&uobj->mutex);
 565
 566         return in_len;
 567
 568 err_copy:
 569         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 570
 571 err_idr:
 572         ib_dealloc_pd(pd);
 573
 574 err:
 575         put_uobj_write(uobj);
 576         return ret;
 577 }
 578
 579 ssize_t ib_uverbs_dealloc_pd(struct ib_uverbs_file *file,
 580                              const char __user *buf,
 581                              int in_len, int out_len)
 582 {
 583         struct ib_uverbs_dealloc_pd cmd;
 584         struct ib_uobject          *uobj;
 585         int                         ret;
 586
 587         if (copy_from_user(&cmd, buf, sizeof cmd))
 588                 return -EFAULT;
 589
 590         uobj = idr_write_uobj(&ib_uverbs_pd_idr, cmd.pd_handle, file->ucontext);
 591         if (!uobj)
 592                 return -EINVAL;
 593
 594         ret = ib_dealloc_pd(uobj->object);
 595         if (!ret)
 596                 uobj->live = 0;
 597
 598         put_uobj_write(uobj);
 599
 600         if (ret)
 601                 return ret;
 602
 603         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 604
 605         mutex_lock(&file->mutex);
 606         list_del(&uobj->list);
 607         mutex_unlock(&file->mutex);
 608
 609         put_uobj(uobj);
 610
 611         return in_len;
 612 }
 613
 614 struct xrcd_table_entry {
 615         struct rb_node  node;
 616         struct ib_xrcd *xrcd;
 617         struct inode   *inode;
 618 };
 619
 620 static int xrcd_table_insert(struct ib_uverbs_device *dev,
 621                             struct inode *inode,
 622                             struct ib_xrcd *xrcd)
 623 {
 624         struct xrcd_table_entry *entry, *scan;
 625         struct rb_node **p = &dev->xrcd_tree.rb_node;
 626         struct rb_node *parent = NULL;
 627
 628         entry = kmalloc(sizeof *entry, GFP_KERNEL);
 629         if (!entry)
 630                 return -ENOMEM;
 631
 632         entry->xrcd  = xrcd;
 633         entry->inode = inode;
 634
 635         while (*p) {
 636                 parent = *p;
 637                 scan = rb_entry(parent, struct xrcd_table_entry, node);
 638
 639                 if (inode < scan->inode) {
 640                         p = &(*p)->rb_left;
 641                 } else if (inode > scan->inode) {
 642                         p = &(*p)->rb_right;
 643                 } else {
 644                         kfree(entry);
 645                         return -EEXIST;
 646                 }
 647         }
 648
 649         rb_link_node(&entry->node, parent, p);
 650         rb_insert_color(&entry->node, &dev->xrcd_tree);
 651         igrab(inode);
 652         return 0;
 653 }
 654
 655 static struct xrcd_table_entry *xrcd_table_search(struct ib_uverbs_device *dev,
 656                                                   struct inode *inode)
 657 {
 658         struct xrcd_table_entry *entry;
 659         struct rb_node *p = dev->xrcd_tree.rb_node;
 660
 661         while (p) {
 662                 entry = rb_entry(p, struct xrcd_table_entry, node);
 663
 664                 if (inode < entry->inode)
 665                         p = p->rb_left;
 666                 else if (inode > entry->inode)
 667                         p = p->rb_right;
 668                 else
 669                         return entry;
 670         }
 671
 672         return NULL;
 673 }
 674
 675 static struct ib_xrcd *find_xrcd(struct ib_uverbs_device *dev, struct inode *inode)
 676 {
 677         struct xrcd_table_entry *entry;
 678
 679         entry = xrcd_table_search(dev, inode);
 680         if (!entry)
 681                 return NULL;
 682
 683         return entry->xrcd;
 684 }
 685
 686 static void xrcd_table_delete(struct ib_uverbs_device *dev,
 687                               struct inode *inode)
 688 {
 689         struct xrcd_table_entry *entry;
 690
 691         entry = xrcd_table_search(dev, inode);
 692         if (entry) {
 693                 iput(inode);
 694                 rb_erase(&entry->node, &dev->xrcd_tree);
 695                 kfree(entry);
 696         }
 697 }
 698
 699 ssize_t ib_uverbs_open_xrcd(struct ib_uverbs_file *file,
 700                             const char __user *buf, int in_len,
 701                             int out_len)
 702 {
 703         struct ib_uverbs_open_xrcd      cmd;
 704         struct ib_uverbs_open_xrcd_resp resp;
 705         struct ib_udata                 udata;
 706         struct ib_uxrcd_object         *obj;
 707         struct ib_xrcd                 *xrcd = NULL;
 708         struct fd                       f = {NULL, 0};
 709         struct inode                   *inode = NULL;
 710         int                             ret = 0;
 711         int                             new_xrcd = 0;
 712
 713         if (out_len < sizeof resp)
 714                 return -ENOSPC;
 715
 716         if (copy_from_user(&cmd, buf, sizeof cmd))
 717                 return -EFAULT;
 718
 719         INIT_UDATA(&udata, buf + sizeof cmd,
 720                    (unsigned long) cmd.response + sizeof resp,
 721                    in_len - sizeof cmd, out_len - sizeof  resp);
 722
 723         mutex_lock(&file->device->xrcd_tree_mutex);
 724
 725         if (cmd.fd != -1) {
 726                 /* search for file descriptor */
 727                 f = fdget(cmd.fd);
 728                 if (!f.file) {
 729                         ret = -EBADF;
 730                         goto err_tree_mutex_unlock;
 731                 }
 732
 733                 inode = f.file->f_path.dentry->d_inode;
 734                 xrcd = find_xrcd(file->device, inode);
 735                 if (!xrcd && !(cmd.oflags & O_CREAT)) {
 736                         /* no file descriptor. Need CREATE flag */
 737                         ret = -EAGAIN;
 738                         goto err_tree_mutex_unlock;
 739                 }
 740
 741                 if (xrcd && cmd.oflags & O_EXCL) {
 742                         ret = -EINVAL;
 743                         goto err_tree_mutex_unlock;
 744                 }
 745         }
 746
 747         obj = kmalloc(sizeof *obj, GFP_KERNEL);
 748         if (!obj) {
 749                 ret = -ENOMEM;
 750                 goto err_tree_mutex_unlock;
 751         }
 752
 753         init_uobj(&obj->uobject, 0, file->ucontext, &xrcd_lock_class);
 754
 755         down_write(&obj->uobject.mutex);
 756
 757         if (!xrcd) {
 758                 xrcd = file->device->ib_dev->alloc_xrcd(file->device->ib_dev,
 759                                                         file->ucontext, &udata);
 760                 if (IS_ERR(xrcd)) {
 761                         ret = PTR_ERR(xrcd);
 762                         goto err;
 763                 }
 764
 765                 xrcd->inode   = inode;
 766                 xrcd->device  = file->device->ib_dev;
 767                 atomic_set(&xrcd->usecnt, 0);
 768                 mutex_init(&xrcd->tgt_qp_mutex);
 769                 INIT_LIST_HEAD(&xrcd->tgt_qp_list);
 770                 new_xrcd = 1;
 771         }
 772
 773         atomic_set(&obj->refcnt, 0);
 774         obj->uobject.object = xrcd;
 775         ret = idr_add_uobj(&ib_uverbs_xrcd_idr, &obj->uobject);
 776         if (ret)
 777                 goto err_idr;
 778
 779         memset(&resp, 0, sizeof resp);
 780         resp.xrcd_handle = obj->uobject.id;
 781
 782         if (inode) {
 783                 if (new_xrcd) {
 784                         /* create new inode/xrcd table entry */
 785                         ret = xrcd_table_insert(file->device, inode, xrcd);
 786                         if (ret)
 787                                 goto err_insert_xrcd;
 788                 }
 789                 atomic_inc(&xrcd->usecnt);
 790         }
 791
 792         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 793                          &resp, sizeof resp)) {
 794                 ret = -EFAULT;
 795                 goto err_copy;
 796         }
 797
 798         if (f.file)
 799                 fdput(f);
 800
 801         mutex_lock(&file->mutex);
 802         list_add_tail(&obj->uobject.list, &file->ucontext->xrcd_list);
 803         mutex_unlock(&file->mutex);
 804
 805         obj->uobject.live = 1;
 806         up_write(&obj->uobject.mutex);
 807
 808         mutex_unlock(&file->device->xrcd_tree_mutex);
 809         return in_len;
 810
 811 err_copy:
 812         if (inode) {
 813                 if (new_xrcd)
 814                         xrcd_table_delete(file->device, inode);
 815                 atomic_dec(&xrcd->usecnt);
 816         }
 817
 818 err_insert_xrcd:
 819         idr_remove_uobj(&ib_uverbs_xrcd_idr, &obj->uobject);
 820
 821 err_idr:
 822         ib_dealloc_xrcd(xrcd);
 823
 824 err:
 825         put_uobj_write(&obj->uobject);
 826
 827 err_tree_mutex_unlock:
 828         if (f.file)
 829                 fdput(f);
 830
 831         mutex_unlock(&file->device->xrcd_tree_mutex);
 832
 833         return ret;
 834 }
 835
 836 ssize_t ib_uverbs_close_xrcd(struct ib_uverbs_file *file,
 837                              const char __user *buf, int in_len,
 838                              int out_len)
 839 {
 840         struct ib_uverbs_close_xrcd cmd;
 841         struct ib_uobject           *uobj;
 842         struct ib_xrcd              *xrcd = NULL;
 843         struct inode                *inode = NULL;
 844         struct ib_uxrcd_object      *obj;
 845         int                         live;
 846         int                         ret = 0;
 847
 848         if (copy_from_user(&cmd, buf, sizeof cmd))
 849                 return -EFAULT;
 850
 851         mutex_lock(&file->device->xrcd_tree_mutex);
 852         uobj = idr_write_uobj(&ib_uverbs_xrcd_idr, cmd.xrcd_handle, file->ucontext);
 853         if (!uobj) {
 854                 ret = -EINVAL;
 855                 goto out;
 856         }
 857
 858         xrcd  = uobj->object;
 859         inode = xrcd->inode;
 860         obj   = container_of(uobj, struct ib_uxrcd_object, uobject);
 861         if (atomic_read(&obj->refcnt)) {
 862                 put_uobj_write(uobj);
 863                 ret = -EBUSY;
 864                 goto out;
 865         }
 866
 867         if (!inode || atomic_dec_and_test(&xrcd->usecnt)) {
 868                 ret = ib_dealloc_xrcd(uobj->object);
 869                 if (!ret)
 870                         uobj->live = 0;
 871         }
 872
 873         live = uobj->live;
 874         if (inode && ret)
 875                 atomic_inc(&xrcd->usecnt);
 876
 877         put_uobj_write(uobj);
 878
 879         if (ret)
 880                 goto out;
 881
 882         if (inode && !live)
 883                 xrcd_table_delete(file->device, inode);
 884
 885         idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
 886         mutex_lock(&file->mutex);
 887         list_del(&uobj->list);
 888         mutex_unlock(&file->mutex);
 889
 890         put_uobj(uobj);
 891         ret = in_len;
 892
 893 out:
 894         mutex_unlock(&file->device->xrcd_tree_mutex);
 895         return ret;
 896 }
 897
 898 void ib_uverbs_dealloc_xrcd(struct ib_uverbs_device *dev,
 899                             struct ib_xrcd *xrcd)
 900 {
 901         struct inode *inode;
 902
 903         inode = xrcd->inode;
 904         if (inode && !atomic_dec_and_test(&xrcd->usecnt))
 905                 return;
 906
 907         ib_dealloc_xrcd(xrcd);
 908
 909         if (inode)
 910                 xrcd_table_delete(dev, inode);
 911 }
 912
 913 ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
 914                          const char __user *buf, int in_len,
 915                          int out_len)
 916 {
 917         struct ib_uverbs_reg_mr      cmd;
 918         struct ib_uverbs_reg_mr_resp resp;
 919         struct ib_udata              udata;
 920         struct ib_uobject           *uobj;
 921         struct ib_pd                *pd;
 922         struct ib_mr                *mr;
 923         int                          ret;
 924
 925         if (out_len < sizeof resp)
 926                 return -ENOSPC;
 927
 928         if (copy_from_user(&cmd, buf, sizeof cmd))
 929                 return -EFAULT;
 930
 931         INIT_UDATA(&udata, buf + sizeof cmd,
 932                    (unsigned long) cmd.response + sizeof resp,
 933                    in_len - sizeof cmd, out_len - sizeof resp);
 934
 935         if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))
 936                 return -EINVAL;
 937
 938         /*
 939          * Local write permission is required if remote write or
 940          * remote atomic permission is also requested.
 941          */
 942         if (cmd.access_flags & (IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_REMOTE_WRITE) &&
 943             !(cmd.access_flags & IB_ACCESS_LOCAL_WRITE))
 944                 return -EINVAL;
 945
 946         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
 947         if (!uobj)
 948                 return -ENOMEM;
 949
 950         init_uobj(uobj, 0, file->ucontext, &mr_lock_class);
 951         down_write(&uobj->mutex);
 952
 953         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
 954         if (!pd) {
 955                 ret = -EINVAL;
 956                 goto err_free;
 957         }
 958
 959         mr = pd->device->reg_user_mr(pd, cmd.start, cmd.length, cmd.hca_va,
 960                                      cmd.access_flags, &udata);
 961         if (IS_ERR(mr)) {
 962                 ret = PTR_ERR(mr);
 963                 goto err_put;
 964         }
 965
 966         mr->device  = pd->device;
 967         mr->pd      = pd;
 968         mr->uobject = uobj;
 969         atomic_inc(&pd->usecnt);
 970         atomic_set(&mr->usecnt, 0);
 971
 972         uobj->object = mr;
 973         ret = idr_add_uobj(&ib_uverbs_mr_idr, uobj);
 974         if (ret)
 975                 goto err_unreg;
 976
 977         memset(&resp, 0, sizeof resp);
 978         resp.lkey      = mr->lkey;
 979         resp.rkey      = mr->rkey;
 980         resp.mr_handle = uobj->id;
 981
 982         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 983                          &resp, sizeof resp)) {
 984                 ret = -EFAULT;
 985                 goto err_copy;
 986         }
 987
 988         put_pd_read(pd);
 989
 990         mutex_lock(&file->mutex);
 991         list_add_tail(&uobj->list, &file->ucontext->mr_list);
 992         mutex_unlock(&file->mutex);
 993
 994         uobj->live = 1;
 995
 996         up_write(&uobj->mutex);
 997
 998         return in_len;
 999
1000 err_copy:
1001         idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
1002
1003 err_unreg:
1004         ib_dereg_mr(mr);
1005
1006 err_put:
1007         put_pd_read(pd);
1008
1009 err_free:
1010         put_uobj_write(uobj);
1011         return ret;
1012 }
1013
1014 ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
1015                            const char __user *buf, int in_len,
1016                            int out_len)
1017 {
1018         struct ib_uverbs_dereg_mr cmd;
1019         struct ib_mr             *mr;
1020         struct ib_uobject        *uobj;
1021         int                       ret = -EINVAL;
1022
1023         if (copy_from_user(&cmd, buf, sizeof cmd))
1024                 return -EFAULT;
1025
1026         uobj = idr_write_uobj(&ib_uverbs_mr_idr, cmd.mr_handle, file->ucontext);
1027         if (!uobj)
1028                 return -EINVAL;
1029
1030         mr = uobj->object;
1031
1032         ret = ib_dereg_mr(mr);
1033         if (!ret)
1034                 uobj->live = 0;
1035
1036         put_uobj_write(uobj);
1037
1038         if (ret)
1039                 return ret;
1040
1041         idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
1042
1043         mutex_lock(&file->mutex);
1044         list_del(&uobj->list);
1045         mutex_unlock(&file->mutex);
1046
1047         put_uobj(uobj);
1048
1049         return in_len;
1050 }
1051
1052 ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
1053                                       const char __user *buf, int in_len,
1054                                       int out_len)
1055 {
1056         struct ib_uverbs_create_comp_channel       cmd;
1057         struct ib_uverbs_create_comp_channel_resp  resp;
1058         struct file                               *filp;
1059         int ret;
1060
1061         if (out_len < sizeof resp)
1062                 return -ENOSPC;
1063
1064         if (copy_from_user(&cmd, buf, sizeof cmd))
1065                 return -EFAULT;
1066
1067         ret = get_unused_fd();
1068         if (ret < 0)
1069                 return ret;
1070         resp.fd = ret;
1071
1072         filp = ib_uverbs_alloc_event_file(file, 0);
1073         if (IS_ERR(filp)) {
1074                 put_unused_fd(resp.fd);
1075                 return PTR_ERR(filp);
1076         }
1077
1078         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1079                          &resp, sizeof resp)) {
1080                 put_unused_fd(resp.fd);
1081                 fput(filp);
1082                 return -EFAULT;
1083         }
1084
1085         fd_install(resp.fd, filp);
1086         return in_len;
1087 }
1088
1089 ssize_t ib_uverbs_create_cq(struct ib_uverbs_file *file,
1090                             const char __user *buf, int in_len,
1091                             int out_len)
1092 {
1093         struct ib_uverbs_create_cq      cmd;
1094         struct ib_uverbs_create_cq_resp resp;
1095         struct ib_udata                 udata;
1096         struct ib_ucq_object           *obj;
1097         struct ib_uverbs_event_file    *ev_file = NULL;
1098         struct ib_cq                   *cq;
1099         int                             ret;
1100
1101         if (out_len < sizeof resp)
1102                 return -ENOSPC;
1103
1104         if (copy_from_user(&cmd, buf, sizeof cmd))
1105                 return -EFAULT;
1106
1107         INIT_UDATA(&udata, buf + sizeof cmd,
1108                    (unsigned long) cmd.response + sizeof resp,
1109                    in_len - sizeof cmd, out_len - sizeof resp);
1110
1111         if (cmd.comp_vector >= file->device->num_comp_vectors)
1112                 return -EINVAL;
1113
1114         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1115         if (!obj)
1116                 return -ENOMEM;
1117
1118         init_uobj(&obj->uobject, cmd.user_handle, file->ucontext, &cq_lock_class);
1119         down_write(&obj->uobject.mutex);
1120
1121         if (cmd.comp_channel >= 0) {
1122                 ev_file = ib_uverbs_lookup_comp_file(cmd.comp_channel);
1123                 if (!ev_file) {
1124                         ret = -EINVAL;
1125                         goto err;
1126                 }
1127         }
1128
1129         obj->uverbs_file           = file;
1130         obj->comp_events_reported  = 0;
1131         obj->async_events_reported = 0;
1132         INIT_LIST_HEAD(&obj->comp_list);
1133         INIT_LIST_HEAD(&obj->async_list);
1134
1135         cq = file->device->ib_dev->create_cq(file->device->ib_dev, cmd.cqe,
1136                                              cmd.comp_vector,
1137                                              file->ucontext, &udata);
1138         if (IS_ERR(cq)) {
1139                 ret = PTR_ERR(cq);
1140                 goto err_file;
1141         }
1142
1143         cq->device        = file->device->ib_dev;
1144         cq->uobject       = &obj->uobject;
1145         cq->comp_handler  = ib_uverbs_comp_handler;
1146         cq->event_handler = ib_uverbs_cq_event_handler;
1147         cq->cq_context    = ev_file;
1148         atomic_set(&cq->usecnt, 0);
1149
1150         obj->uobject.object = cq;
1151         ret = idr_add_uobj(&ib_uverbs_cq_idr, &obj->uobject);
1152         if (ret)
1153                 goto err_free;
1154
1155         memset(&resp, 0, sizeof resp);
1156         resp.cq_handle = obj->uobject.id;
1157         resp.cqe       = cq->cqe;
1158
1159         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1160                          &resp, sizeof resp)) {
1161                 ret = -EFAULT;
1162                 goto err_copy;
1163         }
1164
1165         mutex_lock(&file->mutex);
1166         list_add_tail(&obj->uobject.list, &file->ucontext->cq_list);
1167         mutex_unlock(&file->mutex);
1168
1169         obj->uobject.live = 1;
1170
1171         up_write(&obj->uobject.mutex);
1172
1173         return in_len;
1174
1175 err_copy:
1176         idr_remove_uobj(&ib_uverbs_cq_idr, &obj->uobject);
1177
1178 err_free:
1179         ib_destroy_cq(cq);
1180
1181 err_file:
1182         if (ev_file)
1183                 ib_uverbs_release_ucq(file, ev_file, obj);
1184
1185 err:
1186         put_uobj_write(&obj->uobject);
1187         return ret;
1188 }
1189
1190 ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
1191                             const char __user *buf, int in_len,
1192                             int out_len)
1193 {
1194         struct ib_uverbs_resize_cq      cmd;
1195         struct ib_uverbs_resize_cq_resp resp;
1196         struct ib_udata                 udata;
1197         struct ib_cq                    *cq;
1198         int                             ret = -EINVAL;
1199
1200         if (copy_from_user(&cmd, buf, sizeof cmd))
1201                 return -EFAULT;
1202
1203         INIT_UDATA(&udata, buf + sizeof cmd,
1204                    (unsigned long) cmd.response + sizeof resp,
1205                    in_len - sizeof cmd, out_len - sizeof resp);
1206
1207         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
1208         if (!cq)
1209                 return -EINVAL;
1210
1211         ret = cq->device->resize_cq(cq, cmd.cqe, &udata);
1212         if (ret)
1213                 goto out;
1214
1215         resp.cqe = cq->cqe;
1216
1217         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1218                          &resp, sizeof resp.cqe))
1219                 ret = -EFAULT;
1220
1221 out:
1222         put_cq_read(cq);
1223
1224         return ret ? ret : in_len;
1225 }
1226
1227 static int copy_wc_to_user(void __user *dest, struct ib_wc *wc)
1228 {
1229         struct ib_uverbs_wc tmp;
1230
1231         tmp.wr_id               = wc->wr_id;
1232         tmp.status              = wc->status;
1233         tmp.opcode              = wc->opcode;
1234         tmp.vendor_err          = wc->vendor_err;
1235         tmp.byte_len            = wc->byte_len;
1236         tmp.ex.imm_data         = (__u32 __force) wc->ex.imm_data;
1237         tmp.qp_num              = wc->qp->qp_num;
1238         tmp.src_qp              = wc->src_qp;
1239         tmp.wc_flags            = wc->wc_flags;
1240         tmp.pkey_index          = wc->pkey_index;
1241         tmp.slid                = wc->slid;
1242         tmp.sl                  = wc->sl;
1243         tmp.dlid_path_bits      = wc->dlid_path_bits;
1244         tmp.port_num            = wc->port_num;
1245         tmp.reserved            = 0;
1246
1247         if (copy_to_user(dest, &tmp, sizeof tmp))
1248                 return -EFAULT;
1249
1250         return 0;
1251 }
1252
1253 ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
1254                           const char __user *buf, int in_len,
1255                           int out_len)
1256 {
1257         struct ib_uverbs_poll_cq       cmd;
1258         struct ib_uverbs_poll_cq_resp  resp;
1259         u8 __user                     *header_ptr;
1260         u8 __user                     *data_ptr;
1261         struct ib_cq                  *cq;
1262         struct ib_wc                   wc;
1263         int                            ret;
1264
1265         if (copy_from_user(&cmd, buf, sizeof cmd))
1266                 return -EFAULT;
1267
1268         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
1269         if (!cq)
1270                 return -EINVAL;
1271
1272         /* we copy a struct ib_uverbs_poll_cq_resp to user space */
1273         header_ptr = (void __user *)(unsigned long) cmd.response;
1274         data_ptr = header_ptr + sizeof resp;
1275
1276         memset(&resp, 0, sizeof resp);
1277         while (resp.count < cmd.ne) {
1278                 ret = ib_poll_cq(cq, 1, &wc);
1279                 if (ret < 0)
1280                         goto out_put;
1281                 if (!ret)
1282                         break;
1283
1284                 ret = copy_wc_to_user(data_ptr, &wc);
1285                 if (ret)
1286                         goto out_put;
1287
1288                 data_ptr += sizeof(struct ib_uverbs_wc);
1289                 ++resp.count;
1290         }
1291
1292         if (copy_to_user(header_ptr, &resp, sizeof resp)) {
1293                 ret = -EFAULT;
1294                 goto out_put;
1295         }
1296
1297         ret = in_len;
1298
1299 out_put:
1300         put_cq_read(cq);
1301         return ret;
1302 }
1303
1304 ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file,
1305                                 const char __user *buf, int in_len,
1306                                 int out_len)
1307 {
1308         struct ib_uverbs_req_notify_cq cmd;
1309         struct ib_cq                  *cq;
1310
1311         if (copy_from_user(&cmd, buf, sizeof cmd))
1312                 return -EFAULT;
1313
1314         cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
1315         if (!cq)
1316                 return -EINVAL;
1317
1318         ib_req_notify_cq(cq, cmd.solicited_only ?
1319                          IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
1320
1321         put_cq_read(cq);
1322
1323         return in_len;
1324 }
1325
1326 ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
1327                              const char __user *buf, int in_len,
1328                              int out_len)
1329 {
1330         struct ib_uverbs_destroy_cq      cmd;
1331         struct ib_uverbs_destroy_cq_resp resp;
1332         struct ib_uobject               *uobj;
1333         struct ib_cq                    *cq;
1334         struct ib_ucq_object            *obj;
1335         struct ib_uverbs_event_file     *ev_file;
1336         int                              ret = -EINVAL;
1337
1338         if (copy_from_user(&cmd, buf, sizeof cmd))
1339                 return -EFAULT;
1340
1341         uobj = idr_write_uobj(&ib_uverbs_cq_idr, cmd.cq_handle, file->ucontext);
1342         if (!uobj)
1343                 return -EINVAL;
1344         cq      = uobj->object;
1345         ev_file = cq->cq_context;
1346         obj     = container_of(cq->uobject, struct ib_ucq_object, uobject);
1347
1348         ret = ib_destroy_cq(cq);
1349         if (!ret)
1350                 uobj->live = 0;
1351
1352         put_uobj_write(uobj);
1353
1354         if (ret)
1355                 return ret;
1356
1357         idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
1358
1359         mutex_lock(&file->mutex);
1360         list_del(&uobj->list);
1361         mutex_unlock(&file->mutex);
1362
1363         ib_uverbs_release_ucq(file, ev_file, obj);
1364
1365         memset(&resp, 0, sizeof resp);
1366         resp.comp_events_reported  = obj->comp_events_reported;
1367         resp.async_events_reported = obj->async_events_reported;
1368
1369         put_uobj(uobj);
1370
1371         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1372                          &resp, sizeof resp))
1373                 return -EFAULT;
1374
1375         return in_len;
1376 }
1377
1378 ssize_t ib_uverbs_create_qp(struct ib_uverbs_file *file,
1379                             const char __user *buf, int in_len,
1380                             int out_len)
1381 {
1382         struct ib_uverbs_create_qp      cmd;
1383         struct ib_uverbs_create_qp_resp resp;
1384         struct ib_udata                 udata;
1385         struct ib_uqp_object           *obj;
1386         struct ib_device               *device;
1387         struct ib_pd                   *pd = NULL;
1388         struct ib_xrcd                 *xrcd = NULL;
1389         struct ib_uobject              *uninitialized_var(xrcd_uobj);
1390         struct ib_cq                   *scq = NULL, *rcq = NULL;
1391         struct ib_srq                  *srq = NULL;
1392         struct ib_qp                   *qp;
1393         struct ib_qp_init_attr          attr;
1394         int ret;
1395
1396         if (out_len < sizeof resp)
1397                 return -ENOSPC;
1398
1399         if (copy_from_user(&cmd, buf, sizeof cmd))
1400                 return -EFAULT;
1401
1402         if (cmd.qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
1403                 return -EPERM;
1404
1405         INIT_UDATA(&udata, buf + sizeof cmd,
1406                    (unsigned long) cmd.response + sizeof resp,
1407                    in_len - sizeof cmd, out_len - sizeof resp);
1408
1409         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1410         if (!obj)
1411                 return -ENOMEM;
1412
1413         init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_class);
1414         down_write(&obj->uevent.uobject.mutex);
1415
1416         if (cmd.qp_type == IB_QPT_XRC_TGT) {
1417                 xrcd = idr_read_xrcd(cmd.pd_handle, file->ucontext, &xrcd_uobj);
1418                 if (!xrcd) {
1419                         ret = -EINVAL;
1420                         goto err_put;
1421                 }
1422                 device = xrcd->device;
1423         } else {
1424                 if (cmd.qp_type == IB_QPT_XRC_INI) {
1425                         cmd.max_recv_wr = cmd.max_recv_sge = 0;
1426                 } else {
1427                         if (cmd.is_srq) {
1428                                 srq = idr_read_srq(cmd.srq_handle, file->ucontext);
1429                                 if (!srq || srq->srq_type != IB_SRQT_BASIC) {
1430                                         ret = -EINVAL;
1431                                         goto err_put;
1432                                 }
1433                         }
1434
1435                         if (cmd.recv_cq_handle != cmd.send_cq_handle) {
1436                                 rcq = idr_read_cq(cmd.recv_cq_handle, file->ucontext, 0);
1437                                 if (!rcq) {
1438                                         ret = -EINVAL;
1439                                         goto err_put;
1440                                 }
1441                         }
1442                 }
1443
1444                 scq = idr_read_cq(cmd.send_cq_handle, file->ucontext, !!rcq);
1445                 rcq = rcq ?: scq;
1446                 pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
1447                 if (!pd || !scq) {
1448                         ret = -EINVAL;
1449                         goto err_put;
1450                 }
1451
1452                 device = pd->device;
1453         }
1454
1455         attr.event_handler = ib_uverbs_qp_event_handler;
1456         attr.qp_context    = file;
1457         attr.send_cq       = scq;
1458         attr.recv_cq       = rcq;
1459         attr.srq           = srq;
1460         attr.xrcd          = xrcd;
1461         attr.sq_sig_type   = cmd.sq_sig_all ? IB_SIGNAL_ALL_WR : IB_SIGNAL_REQ_WR;
1462         attr.qp_type       = cmd.qp_type;
1463         attr.create_flags  = 0;
1464
1465         attr.cap.max_send_wr     = cmd.max_send_wr;
1466         attr.cap.max_recv_wr     = cmd.max_recv_wr;
1467         attr.cap.max_send_sge    = cmd.max_send_sge;
1468         attr.cap.max_recv_sge    = cmd.max_recv_sge;
1469         attr.cap.max_inline_data = cmd.max_inline_data;
1470
1471         obj->uevent.events_reported     = 0;
1472         INIT_LIST_HEAD(&obj->uevent.event_list);
1473         INIT_LIST_HEAD(&obj->mcast_list);
1474
1475         if (cmd.qp_type == IB_QPT_XRC_TGT)
1476                 qp = ib_create_qp(pd, &attr);
1477         else
1478                 qp = device->create_qp(pd, &attr, &udata);
1479
1480         if (IS_ERR(qp)) {
1481                 ret = PTR_ERR(qp);
1482                 goto err_put;
1483         }
1484
1485         if (cmd.qp_type != IB_QPT_XRC_TGT) {
1486                 qp->real_qp       = qp;
1487                 qp->device        = device;
1488                 qp->pd            = pd;
1489                 qp->send_cq       = attr.send_cq;
1490                 qp->recv_cq       = attr.recv_cq;
1491                 qp->srq           = attr.srq;
1492                 qp->event_handler = attr.event_handler;
1493                 qp->qp_context    = attr.qp_context;
1494                 qp->qp_type       = attr.qp_type;
1495                 atomic_set(&qp->usecnt, 0);
1496                 atomic_inc(&pd->usecnt);
1497                 atomic_inc(&attr.send_cq->usecnt);
1498                 if (attr.recv_cq)
1499                         atomic_inc(&attr.recv_cq->usecnt);
1500                 if (attr.srq)
1501                         atomic_inc(&attr.srq->usecnt);
1502         }
1503         qp->uobject = &obj->uevent.uobject;
1504
1505         obj->uevent.uobject.object = qp;
1506         ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1507         if (ret)
1508                 goto err_destroy;
1509
1510         memset(&resp, 0, sizeof resp);
1511         resp.qpn             = qp->qp_num;
1512         resp.qp_handle       = obj->uevent.uobject.id;
1513         resp.max_recv_sge    = attr.cap.max_recv_sge;
1514         resp.max_send_sge    = attr.cap.max_send_sge;
1515         resp.max_recv_wr     = attr.cap.max_recv_wr;
1516         resp.max_send_wr     = attr.cap.max_send_wr;
1517         resp.max_inline_data = attr.cap.max_inline_data;
1518
1519         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1520                          &resp, sizeof resp)) {
1521                 ret = -EFAULT;
1522                 goto err_copy;
1523         }
1524
1525         if (xrcd)
1526                 put_xrcd_read(xrcd_uobj);
1527         if (pd)
1528                 put_pd_read(pd);
1529         if (scq)
1530                 put_cq_read(scq);
1531         if (rcq && rcq != scq)
1532                 put_cq_read(rcq);
1533         if (srq)
1534                 put_srq_read(srq);
1535
1536         mutex_lock(&file->mutex);
1537         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1538         mutex_unlock(&file->mutex);
1539
1540         obj->uevent.uobject.live = 1;
1541
1542         up_write(&obj->uevent.uobject.mutex);
1543
1544         return in_len;
1545
1546 err_copy:
1547         idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1548
1549 err_destroy:
1550         ib_destroy_qp(qp);
1551
1552 err_put:
1553         if (xrcd)
1554                 put_xrcd_read(xrcd_uobj);
1555         if (pd)
1556                 put_pd_read(pd);
1557         if (scq)
1558                 put_cq_read(scq);
1559         if (rcq && rcq != scq)
1560                 put_cq_read(rcq);
1561         if (srq)
1562                 put_srq_read(srq);
1563
1564         put_uobj_write(&obj->uevent.uobject);
1565         return ret;
1566 }
1567
1568 ssize_t ib_uverbs_open_qp(struct ib_uverbs_file *file,
1569                           const char __user *buf, int in_len, int out_len)
1570 {
1571         struct ib_uverbs_open_qp        cmd;
1572         struct ib_uverbs_create_qp_resp resp;
1573         struct ib_udata                 udata;
1574         struct ib_uqp_object           *obj;
1575         struct ib_xrcd                 *xrcd;
1576         struct ib_uobject              *uninitialized_var(xrcd_uobj);
1577         struct ib_qp                   *qp;
1578         struct ib_qp_open_attr          attr;
1579         int ret;
1580
1581         if (out_len < sizeof resp)
1582                 return -ENOSPC;
1583
1584         if (copy_from_user(&cmd, buf, sizeof cmd))
1585                 return -EFAULT;
1586
1587         INIT_UDATA(&udata, buf + sizeof cmd,
1588                    (unsigned long) cmd.response + sizeof resp,
1589                    in_len - sizeof cmd, out_len - sizeof resp);
1590
1591         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1592         if (!obj)
1593                 return -ENOMEM;
1594
1595         init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_class);
1596         down_write(&obj->uevent.uobject.mutex);
1597
1598         xrcd = idr_read_xrcd(cmd.pd_handle, file->ucontext, &xrcd_uobj);
1599         if (!xrcd) {
1600                 ret = -EINVAL;
1601                 goto err_put;
1602         }
1603
1604         attr.event_handler = ib_uverbs_qp_event_handler;
1605         attr.qp_context    = file;
1606         attr.qp_num        = cmd.qpn;
1607         attr.qp_type       = cmd.qp_type;
1608
1609         obj->uevent.events_reported = 0;
1610         INIT_LIST_HEAD(&obj->uevent.event_list);
1611         INIT_LIST_HEAD(&obj->mcast_list);
1612
1613         qp = ib_open_qp(xrcd, &attr);
1614         if (IS_ERR(qp)) {
1615                 ret = PTR_ERR(qp);
1616                 goto err_put;
1617         }
1618
1619         qp->uobject = &obj->uevent.uobject;
1620
1621         obj->uevent.uobject.object = qp;
1622         ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1623         if (ret)
1624                 goto err_destroy;
1625
1626         memset(&resp, 0, sizeof resp);
1627         resp.qpn       = qp->qp_num;
1628         resp.qp_handle = obj->uevent.uobject.id;
1629
1630         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1631                          &resp, sizeof resp)) {
1632                 ret = -EFAULT;
1633                 goto err_remove;
1634         }
1635
1636         put_xrcd_read(xrcd_uobj);
1637
1638         mutex_lock(&file->mutex);
1639         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1640         mutex_unlock(&file->mutex);
1641
1642         obj->uevent.uobject.live = 1;
1643
1644         up_write(&obj->uevent.uobject.mutex);
1645
1646         return in_len;
1647
1648 err_remove:
1649         idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1650
1651 err_destroy:
1652         ib_destroy_qp(qp);
1653
1654 err_put:
1655         put_xrcd_read(xrcd_uobj);
1656         put_uobj_write(&obj->uevent.uobject);
1657         return ret;
1658 }
1659
1660 ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
1661                            const char __user *buf, int in_len,
1662                            int out_len)
1663 {
1664         struct ib_uverbs_query_qp      cmd;
1665         struct ib_uverbs_query_qp_resp resp;
1666         struct ib_qp                   *qp;
1667         struct ib_qp_attr              *attr;
1668         struct ib_qp_init_attr         *init_attr;
1669         int                            ret;
1670
1671         if (copy_from_user(&cmd, buf, sizeof cmd))
1672                 return -EFAULT;
1673
1674         attr      = kmalloc(sizeof *attr, GFP_KERNEL);
1675         init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
1676         if (!attr || !init_attr) {
1677                 ret = -ENOMEM;
1678                 goto out;
1679         }
1680
1681         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1682         if (!qp) {
1683                 ret = -EINVAL;
1684                 goto out;
1685         }
1686
1687         ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
1688
1689         put_qp_read(qp);
1690
1691         if (ret)
1692                 goto out;
1693
1694         memset(&resp, 0, sizeof resp);
1695
1696         resp.qp_state               = attr->qp_state;
1697         resp.cur_qp_state           = attr->cur_qp_state;
1698         resp.path_mtu               = attr->path_mtu;
1699         resp.path_mig_state         = attr->path_mig_state;
1700         resp.qkey                   = attr->qkey;
1701         resp.rq_psn                 = attr->rq_psn;
1702         resp.sq_psn                 = attr->sq_psn;
1703         resp.dest_qp_num            = attr->dest_qp_num;
1704         resp.qp_access_flags        = attr->qp_access_flags;
1705         resp.pkey_index             = attr->pkey_index;
1706         resp.alt_pkey_index         = attr->alt_pkey_index;
1707         resp.sq_draining            = attr->sq_draining;
1708         resp.max_rd_atomic          = attr->max_rd_atomic;
1709         resp.max_dest_rd_atomic     = attr->max_dest_rd_atomic;
1710         resp.min_rnr_timer          = attr->min_rnr_timer;
1711         resp.port_num               = attr->port_num;
1712         resp.timeout                = attr->timeout;
1713         resp.retry_cnt              = attr->retry_cnt;
1714         resp.rnr_retry              = attr->rnr_retry;
1715         resp.alt_port_num           = attr->alt_port_num;
1716         resp.alt_timeout            = attr->alt_timeout;
1717
1718         memcpy(resp.dest.dgid, attr->ah_attr.grh.dgid.raw, 16);
1719         resp.dest.flow_label        = attr->ah_attr.grh.flow_label;
1720         resp.dest.sgid_index        = attr->ah_attr.grh.sgid_index;
1721         resp.dest.hop_limit         = attr->ah_attr.grh.hop_limit;
1722         resp.dest.traffic_class     = attr->ah_attr.grh.traffic_class;
1723         resp.dest.dlid              = attr->ah_attr.dlid;
1724         resp.dest.sl                = attr->ah_attr.sl;
1725         resp.dest.src_path_bits     = attr->ah_attr.src_path_bits;
1726         resp.dest.static_rate       = attr->ah_attr.static_rate;
1727         resp.dest.is_global         = !!(attr->ah_attr.ah_flags & IB_AH_GRH);
1728         resp.dest.port_num          = attr->ah_attr.port_num;
1729
1730         memcpy(resp.alt_dest.dgid, attr->alt_ah_attr.grh.dgid.raw, 16);
1731         resp.alt_dest.flow_label    = attr->alt_ah_attr.grh.flow_label;
1732         resp.alt_dest.sgid_index    = attr->alt_ah_attr.grh.sgid_index;
1733         resp.alt_dest.hop_limit     = attr->alt_ah_attr.grh.hop_limit;
1734         resp.alt_dest.traffic_class = attr->alt_ah_attr.grh.traffic_class;
1735         resp.alt_dest.dlid          = attr->alt_ah_attr.dlid;
1736         resp.alt_dest.sl            = attr->alt_ah_attr.sl;
1737         resp.alt_dest.src_path_bits = attr->alt_ah_attr.src_path_bits;
1738         resp.alt_dest.static_rate   = attr->alt_ah_attr.static_rate;
1739         resp.alt_dest.is_global     = !!(attr->alt_ah_attr.ah_flags & IB_AH_GRH);
1740         resp.alt_dest.port_num      = attr->alt_ah_attr.port_num;
1741
1742         resp.max_send_wr            = init_attr->cap.max_send_wr;
1743         resp.max_recv_wr            = init_attr->cap.max_recv_wr;
1744         resp.max_send_sge           = init_attr->cap.max_send_sge;
1745         resp.max_recv_sge           = init_attr->cap.max_recv_sge;
1746         resp.max_inline_data        = init_attr->cap.max_inline_data;
1747         resp.sq_sig_all             = init_attr->sq_sig_type == IB_SIGNAL_ALL_WR;
1748
1749         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1750                          &resp, sizeof resp))
1751                 ret = -EFAULT;
1752
1753 out:
1754         kfree(attr);
1755         kfree(init_attr);
1756
1757         return ret ? ret : in_len;
1758 }
1759
1760 /* Remove ignored fields set in the attribute mask */
1761 static int modify_qp_mask(enum ib_qp_type qp_type, int mask)
1762 {
1763         switch (qp_type) {
1764         case IB_QPT_XRC_INI:
1765                 return mask & ~(IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER);
1766         case IB_QPT_XRC_TGT:
1767                 return mask & ~(IB_QP_MAX_QP_RD_ATOMIC | IB_QP_RETRY_CNT |
1768                                 IB_QP_RNR_RETRY);
1769         default:
1770                 return mask;
1771         }
1772 }
1773
1774 ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file,
1775                             const char __user *buf, int in_len,
1776                             int out_len)
1777 {
1778         struct ib_uverbs_modify_qp cmd;
1779         struct ib_udata            udata;
1780         struct ib_qp              *qp;
1781         struct ib_qp_attr         *attr;
1782         int                        ret;
1783
1784         if (copy_from_user(&cmd, buf, sizeof cmd))
1785                 return -EFAULT;
1786
1787         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
1788                    out_len);
1789
1790         attr = kmalloc(sizeof *attr, GFP_KERNEL);
1791         if (!attr)
1792                 return -ENOMEM;
1793
1794         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1795         if (!qp) {
1796                 ret = -EINVAL;
1797                 goto out;
1798         }
1799
1800         attr->qp_state            = cmd.qp_state;
1801         attr->cur_qp_state        = cmd.cur_qp_state;
1802         attr->path_mtu            = cmd.path_mtu;
1803         attr->path_mig_state      = cmd.path_mig_state;
1804         attr->qkey                = cmd.qkey;
1805         attr->rq_psn              = cmd.rq_psn;
1806         attr->sq_psn              = cmd.sq_psn;
1807         attr->dest_qp_num         = cmd.dest_qp_num;
1808         attr->qp_access_flags     = cmd.qp_access_flags;
1809         attr->pkey_index          = cmd.pkey_index;
1810         attr->alt_pkey_index      = cmd.alt_pkey_index;
1811         attr->en_sqd_async_notify = cmd.en_sqd_async_notify;
1812         attr->max_rd_atomic       = cmd.max_rd_atomic;
1813         attr->max_dest_rd_atomic  = cmd.max_dest_rd_atomic;
1814         attr->min_rnr_timer       = cmd.min_rnr_timer;
1815         attr->port_num            = cmd.port_num;
1816         attr->timeout             = cmd.timeout;
1817         attr->retry_cnt           = cmd.retry_cnt;
1818         attr->rnr_retry           = cmd.rnr_retry;
1819         attr->alt_port_num        = cmd.alt_port_num;
1820         attr->alt_timeout         = cmd.alt_timeout;
1821
1822         memcpy(attr->ah_attr.grh.dgid.raw, cmd.dest.dgid, 16);
1823         attr->ah_attr.grh.flow_label        = cmd.dest.flow_label;
1824         attr->ah_attr.grh.sgid_index        = cmd.dest.sgid_index;
1825         attr->ah_attr.grh.hop_limit         = cmd.dest.hop_limit;
1826         attr->ah_attr.grh.traffic_class     = cmd.dest.traffic_class;
1827         attr->ah_attr.dlid                  = cmd.dest.dlid;
1828         attr->ah_attr.sl                    = cmd.dest.sl;
1829         attr->ah_attr.src_path_bits         = cmd.dest.src_path_bits;
1830         attr->ah_attr.static_rate           = cmd.dest.static_rate;
1831         attr->ah_attr.ah_flags              = cmd.dest.is_global ? IB_AH_GRH : 0;
1832         attr->ah_attr.port_num              = cmd.dest.port_num;
1833
1834         memcpy(attr->alt_ah_attr.grh.dgid.raw, cmd.alt_dest.dgid, 16);
1835         attr->alt_ah_attr.grh.flow_label    = cmd.alt_dest.flow_label;
1836         attr->alt_ah_attr.grh.sgid_index    = cmd.alt_dest.sgid_index;
1837         attr->alt_ah_attr.grh.hop_limit     = cmd.alt_dest.hop_limit;
1838         attr->alt_ah_attr.grh.traffic_class = cmd.alt_dest.traffic_class;
1839         attr->alt_ah_attr.dlid              = cmd.alt_dest.dlid;
1840         attr->alt_ah_attr.sl                = cmd.alt_dest.sl;
1841         attr->alt_ah_attr.src_path_bits     = cmd.alt_dest.src_path_bits;
1842         attr->alt_ah_attr.static_rate       = cmd.alt_dest.static_rate;
1843         attr->alt_ah_attr.ah_flags          = cmd.alt_dest.is_global ? IB_AH_GRH : 0;
1844         attr->alt_ah_attr.port_num          = cmd.alt_dest.port_num;
1845
1846         if (qp->real_qp == qp) {
1847                 ret = qp->device->modify_qp(qp, attr,
1848                         modify_qp_mask(qp->qp_type, cmd.attr_mask), &udata);
1849         } else {
1850                 ret = ib_modify_qp(qp, attr, modify_qp_mask(qp->qp_type, cmd.attr_mask));
1851         }
1852
1853         put_qp_read(qp);
1854
1855         if (ret)
1856                 goto out;
1857
1858         ret = in_len;
1859
1860 out:
1861         kfree(attr);
1862
1863         return ret;
1864 }
1865
1866 ssize_t ib_uverbs_destroy_qp(struct ib_uverbs_file *file,
1867                              const char __user *buf, int in_len,
1868                              int out_len)
1869 {
1870         struct ib_uverbs_destroy_qp      cmd;
1871         struct ib_uverbs_destroy_qp_resp resp;
1872         struct ib_uobject               *uobj;
1873         struct ib_qp                    *qp;
1874         struct ib_uqp_object            *obj;
1875         int                              ret = -EINVAL;
1876
1877         if (copy_from_user(&cmd, buf, sizeof cmd))
1878                 return -EFAULT;
1879
1880         memset(&resp, 0, sizeof resp);
1881
1882         uobj = idr_write_uobj(&ib_uverbs_qp_idr, cmd.qp_handle, file->ucontext);
1883         if (!uobj)
1884                 return -EINVAL;
1885         qp  = uobj->object;
1886         obj = container_of(uobj, struct ib_uqp_object, uevent.uobject);
1887
1888         if (!list_empty(&obj->mcast_list)) {
1889                 put_uobj_write(uobj);
1890                 return -EBUSY;
1891         }
1892
1893         ret = ib_destroy_qp(qp);
1894         if (!ret)
1895                 uobj->live = 0;
1896
1897         put_uobj_write(uobj);
1898
1899         if (ret)
1900                 return ret;
1901
1902         idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
1903
1904         mutex_lock(&file->mutex);
1905         list_del(&uobj->list);
1906         mutex_unlock(&file->mutex);
1907
1908         ib_uverbs_release_uevent(file, &obj->uevent);
1909
1910         resp.events_reported = obj->uevent.events_reported;
1911
1912         put_uobj(uobj);
1913
1914         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1915                          &resp, sizeof resp))
1916                 return -EFAULT;
1917
1918         return in_len;
1919 }
1920
1921 ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
1922                             const char __user *buf, int in_len,
1923                             int out_len)
1924 {
1925         struct ib_uverbs_post_send      cmd;
1926         struct ib_uverbs_post_send_resp resp;
1927         struct ib_uverbs_send_wr       *user_wr;
1928         struct ib_send_wr              *wr = NULL, *last, *next, *bad_wr;
1929         struct ib_qp                   *qp;
1930         int                             i, sg_ind;
1931         int                             is_ud;
1932         ssize_t                         ret = -EINVAL;
1933
1934         if (copy_from_user(&cmd, buf, sizeof cmd))
1935                 return -EFAULT;
1936
1937         if (in_len < sizeof cmd + cmd.wqe_size * cmd.wr_count +
1938             cmd.sge_count * sizeof (struct ib_uverbs_sge))
1939                 return -EINVAL;
1940
1941         if (cmd.wqe_size < sizeof (struct ib_uverbs_send_wr))
1942                 return -EINVAL;
1943
1944         user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL);
1945         if (!user_wr)
1946                 return -ENOMEM;
1947
1948         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1949         if (!qp)
1950                 goto out;
1951
1952         is_ud = qp->qp_type == IB_QPT_UD;
1953         sg_ind = 0;
1954         last = NULL;
1955         for (i = 0; i < cmd.wr_count; ++i) {
1956                 if (copy_from_user(user_wr,
1957                                    buf + sizeof cmd + i * cmd.wqe_size,
1958                                    cmd.wqe_size)) {
1959                         ret = -EFAULT;
1960                         goto out_put;
1961                 }
1962
1963                 if (user_wr->num_sge + sg_ind > cmd.sge_count) {
1964                         ret = -EINVAL;
1965                         goto out_put;
1966                 }
1967
1968                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
1969                                user_wr->num_sge * sizeof (struct ib_sge),
1970                                GFP_KERNEL);
1971                 if (!next) {
1972                         ret = -ENOMEM;
1973                         goto out_put;
1974                 }
1975
1976                 if (!last)
1977                         wr = next;
1978                 else
1979                         last->next = next;
1980                 last = next;
1981
1982                 next->next       = NULL;
1983                 next->wr_id      = user_wr->wr_id;
1984                 next->num_sge    = user_wr->num_sge;
1985                 next->opcode     = user_wr->opcode;
1986                 next->send_flags = user_wr->send_flags;
1987
1988                 if (is_ud) {
1989                         next->wr.ud.ah = idr_read_ah(user_wr->wr.ud.ah,
1990                                                      file->ucontext);
1991                         if (!next->wr.ud.ah) {
1992                                 ret = -EINVAL;
1993                                 goto out_put;
1994                         }
1995                         next->wr.ud.remote_qpn  = user_wr->wr.ud.remote_qpn;
1996                         next->wr.ud.remote_qkey = user_wr->wr.ud.remote_qkey;
1997                 } else {
1998                         switch (next->opcode) {
1999                         case IB_WR_RDMA_WRITE_WITH_IMM:
2000                                 next->ex.imm_data =
2001                                         (__be32 __force) user_wr->ex.imm_data;
2002                         case IB_WR_RDMA_WRITE:
2003                         case IB_WR_RDMA_READ:
2004                                 next->wr.rdma.remote_addr =
2005                                         user_wr->wr.rdma.remote_addr;
2006                                 next->wr.rdma.rkey        =
2007                                         user_wr->wr.rdma.rkey;
2008                                 break;
2009                         case IB_WR_SEND_WITH_IMM:
2010                                 next->ex.imm_data =
2011                                         (__be32 __force) user_wr->ex.imm_data;
2012                                 break;
2013                         case IB_WR_SEND_WITH_INV:
2014                                 next->ex.invalidate_rkey =
2015                                         user_wr->ex.invalidate_rkey;
2016                                 break;
2017                         case IB_WR_ATOMIC_CMP_AND_SWP:
2018                         case IB_WR_ATOMIC_FETCH_AND_ADD:
2019                                 next->wr.atomic.remote_addr =
2020                                         user_wr->wr.atomic.remote_addr;
2021                                 next->wr.atomic.compare_add =
2022                                         user_wr->wr.atomic.compare_add;
2023                                 next->wr.atomic.swap = user_wr->wr.atomic.swap;
2024                                 next->wr.atomic.rkey = user_wr->wr.atomic.rkey;
2025                                 break;
2026                         default:
2027                                 break;
2028                         }
2029                 }
2030
2031                 if (next->num_sge) {
2032                         next->sg_list = (void *) next +
2033                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
2034                         if (copy_from_user(next->sg_list,
2035                                            buf + sizeof cmd +
2036                                            cmd.wr_count * cmd.wqe_size +
2037                                            sg_ind * sizeof (struct ib_sge),
2038                                            next->num_sge * sizeof (struct ib_sge))) {
2039                                 ret = -EFAULT;
2040                                 goto out_put;
2041                         }
2042                         sg_ind += next->num_sge;
2043                 } else
2044                         next->sg_list = NULL;
2045         }
2046
2047         resp.bad_wr = 0;
2048         ret = qp->device->post_send(qp->real_qp, wr, &bad_wr);
2049         if (ret)
2050                 for (next = wr; next; next = next->next) {
2051                         ++resp.bad_wr;
2052                         if (next == bad_wr)
2053                                 break;
2054                 }
2055
2056         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2057                          &resp, sizeof resp))
2058                 ret = -EFAULT;
2059
2060 out_put:
2061         put_qp_read(qp);
2062
2063         while (wr) {
2064                 if (is_ud && wr->wr.ud.ah)
2065                         put_ah_read(wr->wr.ud.ah);
2066                 next = wr->next;
2067                 kfree(wr);
2068                 wr = next;
2069         }
2070
2071 out:
2072         kfree(user_wr);
2073
2074         return ret ? ret : in_len;
2075 }
2076
2077 static struct ib_recv_wr *ib_uverbs_unmarshall_recv(const char __user *buf,
2078                                                     int in_len,
2079                                                     u32 wr_count,
2080                                                     u32 sge_count,
2081                                                     u32 wqe_size)
2082 {
2083         struct ib_uverbs_recv_wr *user_wr;
2084         struct ib_recv_wr        *wr = NULL, *last, *next;
2085         int                       sg_ind;
2086         int                       i;
2087         int                       ret;
2088
2089         if (in_len < wqe_size * wr_count +
2090             sge_count * sizeof (struct ib_uverbs_sge))
2091                 return ERR_PTR(-EINVAL);
2092
2093         if (wqe_size < sizeof (struct ib_uverbs_recv_wr))
2094                 return ERR_PTR(-EINVAL);
2095
2096         user_wr = kmalloc(wqe_size, GFP_KERNEL);
2097         if (!user_wr)
2098                 return ERR_PTR(-ENOMEM);
2099
2100         sg_ind = 0;
2101         last = NULL;
2102         for (i = 0; i < wr_count; ++i) {
2103                 if (copy_from_user(user_wr, buf + i * wqe_size,
2104                                    wqe_size)) {
2105                         ret = -EFAULT;
2106                         goto err;
2107                 }
2108
2109                 if (user_wr->num_sge + sg_ind > sge_count) {
2110                         ret = -EINVAL;
2111                         goto err;
2112                 }
2113
2114                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
2115                                user_wr->num_sge * sizeof (struct ib_sge),
2116                                GFP_KERNEL);
2117                 if (!next) {
2118                         ret = -ENOMEM;
2119                         goto err;
2120                 }
2121
2122                 if (!last)
2123                         wr = next;
2124                 else
2125                         last->next = next;
2126                 last = next;
2127
2128                 next->next       = NULL;
2129                 next->wr_id      = user_wr->wr_id;
2130                 next->num_sge    = user_wr->num_sge;
2131
2132                 if (next->num_sge) {
2133                         next->sg_list = (void *) next +
2134                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
2135                         if (copy_from_user(next->sg_list,
2136                                            buf + wr_count * wqe_size +
2137                                            sg_ind * sizeof (struct ib_sge),
2138                                            next->num_sge * sizeof (struct ib_sge))) {
2139                                 ret = -EFAULT;
2140                                 goto err;
2141                         }
2142                         sg_ind += next->num_sge;
2143                 } else
2144                         next->sg_list = NULL;
2145         }
2146
2147         kfree(user_wr);
2148         return wr;
2149
2150 err:
2151         kfree(user_wr);
2152
2153         while (wr) {
2154                 next = wr->next;
2155                 kfree(wr);
2156                 wr = next;
2157         }
2158
2159         return ERR_PTR(ret);
2160 }
2161
2162 ssize_t ib_uverbs_post_recv(struct ib_uverbs_file *file,
2163                             const char __user *buf, int in_len,
2164                             int out_len)
2165 {
2166         struct ib_uverbs_post_recv      cmd;
2167         struct ib_uverbs_post_recv_resp resp;
2168         struct ib_recv_wr              *wr, *next, *bad_wr;
2169         struct ib_qp                   *qp;
2170         ssize_t                         ret = -EINVAL;
2171
2172         if (copy_from_user(&cmd, buf, sizeof cmd))
2173                 return -EFAULT;
2174
2175         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
2176                                        in_len - sizeof cmd, cmd.wr_count,
2177                                        cmd.sge_count, cmd.wqe_size);
2178         if (IS_ERR(wr))
2179                 return PTR_ERR(wr);
2180
2181         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
2182         if (!qp)
2183                 goto out;
2184
2185         resp.bad_wr = 0;
2186         ret = qp->device->post_recv(qp->real_qp, wr, &bad_wr);
2187
2188         put_qp_read(qp);
2189
2190         if (ret)
2191                 for (next = wr; next; next = next->next) {
2192                         ++resp.bad_wr;
2193                         if (next == bad_wr)
2194                                 break;
2195                 }
2196
2197         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2198                          &resp, sizeof resp))
2199                 ret = -EFAULT;
2200
2201 out:
2202         while (wr) {
2203                 next = wr->next;
2204                 kfree(wr);
2205                 wr = next;
2206         }
2207
2208         return ret ? ret : in_len;
2209 }
2210
2211 ssize_t ib_uverbs_post_srq_recv(struct ib_uverbs_file *file,
2212                                 const char __user *buf, int in_len,
2213                                 int out_len)
2214 {
2215         struct ib_uverbs_post_srq_recv      cmd;
2216         struct ib_uverbs_post_srq_recv_resp resp;
2217         struct ib_recv_wr                  *wr, *next, *bad_wr;
2218         struct ib_srq                      *srq;
2219         ssize_t                             ret = -EINVAL;
2220
2221         if (copy_from_user(&cmd, buf, sizeof cmd))
2222                 return -EFAULT;
2223
2224         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
2225                                        in_len - sizeof cmd, cmd.wr_count,
2226                                        cmd.sge_count, cmd.wqe_size);
2227         if (IS_ERR(wr))
2228                 return PTR_ERR(wr);
2229
2230         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2231         if (!srq)
2232                 goto out;
2233
2234         resp.bad_wr = 0;
2235         ret = srq->device->post_srq_recv(srq, wr, &bad_wr);
2236
2237         put_srq_read(srq);
2238
2239         if (ret)
2240                 for (next = wr; next; next = next->next) {
2241                         ++resp.bad_wr;
2242                         if (next == bad_wr)
2243                                 break;
2244                 }
2245
2246         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2247                          &resp, sizeof resp))
2248                 ret = -EFAULT;
2249
2250 out:
2251         while (wr) {
2252                 next = wr->next;
2253                 kfree(wr);
2254                 wr = next;
2255         }
2256
2257         return ret ? ret : in_len;
2258 }
2259
2260 ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
2261                             const char __user *buf, int in_len,
2262                             int out_len)
2263 {
2264         struct ib_uverbs_create_ah       cmd;
2265         struct ib_uverbs_create_ah_resp  resp;
2266         struct ib_uobject               *uobj;
2267         struct ib_pd                    *pd;
2268         struct ib_ah                    *ah;
2269         struct ib_ah_attr               attr;
2270         int ret;
2271
2272         if (out_len < sizeof resp)
2273                 return -ENOSPC;
2274
2275         if (copy_from_user(&cmd, buf, sizeof cmd))
2276                 return -EFAULT;
2277
2278         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
2279         if (!uobj)
2280                 return -ENOMEM;
2281
2282         init_uobj(uobj, cmd.user_handle, file->ucontext, &ah_lock_class);
2283         down_write(&uobj->mutex);
2284
2285         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
2286         if (!pd) {
2287                 ret = -EINVAL;
2288                 goto err;
2289         }
2290
2291         attr.dlid              = cmd.attr.dlid;
2292         attr.sl                = cmd.attr.sl;
2293         attr.src_path_bits     = cmd.attr.src_path_bits;
2294         attr.static_rate       = cmd.attr.static_rate;
2295         attr.ah_flags          = cmd.attr.is_global ? IB_AH_GRH : 0;
2296         attr.port_num          = cmd.attr.port_num;
2297         attr.grh.flow_label    = cmd.attr.grh.flow_label;
2298         attr.grh.sgid_index    = cmd.attr.grh.sgid_index;
2299         attr.grh.hop_limit     = cmd.attr.grh.hop_limit;
2300         attr.grh.traffic_class = cmd.attr.grh.traffic_class;
2301         memcpy(attr.grh.dgid.raw, cmd.attr.grh.dgid, 16);
2302
2303         ah = ib_create_ah(pd, &attr);
2304         if (IS_ERR(ah)) {
2305                 ret = PTR_ERR(ah);
2306                 goto err_put;
2307         }
2308
2309         ah->uobject  = uobj;
2310         uobj->object = ah;
2311
2312         ret = idr_add_uobj(&ib_uverbs_ah_idr, uobj);
2313         if (ret)
2314                 goto err_destroy;
2315
2316         resp.ah_handle = uobj->id;
2317
2318         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2319                          &resp, sizeof resp)) {
2320                 ret = -EFAULT;
2321                 goto err_copy;
2322         }
2323
2324         put_pd_read(pd);
2325
2326         mutex_lock(&file->mutex);
2327         list_add_tail(&uobj->list, &file->ucontext->ah_list);
2328         mutex_unlock(&file->mutex);
2329
2330         uobj->live = 1;
2331
2332         up_write(&uobj->mutex);
2333
2334         return in_len;
2335
2336 err_copy:
2337         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
2338
2339 err_destroy:
2340         ib_destroy_ah(ah);
2341
2342 err_put:
2343         put_pd_read(pd);
2344
2345 err:
2346         put_uobj_write(uobj);
2347         return ret;
2348 }
2349
2350 ssize_t ib_uverbs_destroy_ah(struct ib_uverbs_file *file,
2351                              const char __user *buf, int in_len, int out_len)
2352 {
2353         struct ib_uverbs_destroy_ah cmd;
2354         struct ib_ah               *ah;
2355         struct ib_uobject          *uobj;
2356         int                         ret;
2357
2358         if (copy_from_user(&cmd, buf, sizeof cmd))
2359                 return -EFAULT;
2360
2361         uobj = idr_write_uobj(&ib_uverbs_ah_idr, cmd.ah_handle, file->ucontext);
2362         if (!uobj)
2363                 return -EINVAL;
2364         ah = uobj->object;
2365
2366         ret = ib_destroy_ah(ah);
2367         if (!ret)
2368                 uobj->live = 0;
2369
2370         put_uobj_write(uobj);
2371
2372         if (ret)
2373                 return ret;
2374
2375         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
2376
2377         mutex_lock(&file->mutex);
2378         list_del(&uobj->list);
2379         mutex_unlock(&file->mutex);
2380
2381         put_uobj(uobj);
2382
2383         return in_len;
2384 }
2385
2386 ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
2387                                const char __user *buf, int in_len,
2388                                int out_len)
2389 {
2390         struct ib_uverbs_attach_mcast cmd;
2391         struct ib_qp                 *qp;
2392         struct ib_uqp_object         *obj;
2393         struct ib_uverbs_mcast_entry *mcast;
2394         int                           ret;
2395
2396         if (copy_from_user(&cmd, buf, sizeof cmd))
2397                 return -EFAULT;
2398
2399         qp = idr_write_qp(cmd.qp_handle, file->ucontext);
2400         if (!qp)
2401                 return -EINVAL;
2402
2403         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
2404
2405         list_for_each_entry(mcast, &obj->mcast_list, list)
2406                 if (cmd.mlid == mcast->lid &&
2407                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
2408                         ret = 0;
2409                         goto out_put;
2410                 }
2411
2412         mcast = kmalloc(sizeof *mcast, GFP_KERNEL);
2413         if (!mcast) {
2414                 ret = -ENOMEM;
2415                 goto out_put;
2416         }
2417
2418         mcast->lid = cmd.mlid;
2419         memcpy(mcast->gid.raw, cmd.gid, sizeof mcast->gid.raw);
2420
2421         ret = ib_attach_mcast(qp, &mcast->gid, cmd.mlid);
2422         if (!ret)
2423                 list_add_tail(&mcast->list, &obj->mcast_list);
2424         else
2425                 kfree(mcast);
2426
2427 out_put:
2428         put_qp_write(qp);
2429
2430         return ret ? ret : in_len;
2431 }
2432
2433 ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
2434                                const char __user *buf, int in_len,
2435                                int out_len)
2436 {
2437         struct ib_uverbs_detach_mcast cmd;
2438         struct ib_uqp_object         *obj;
2439         struct ib_qp                 *qp;
2440         struct ib_uverbs_mcast_entry *mcast;
2441         int                           ret = -EINVAL;
2442
2443         if (copy_from_user(&cmd, buf, sizeof cmd))
2444                 return -EFAULT;
2445
2446         qp = idr_write_qp(cmd.qp_handle, file->ucontext);
2447         if (!qp)
2448                 return -EINVAL;
2449
2450         ret = ib_detach_mcast(qp, (union ib_gid *) cmd.gid, cmd.mlid);
2451         if (ret)
2452                 goto out_put;
2453
2454         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
2455
2456         list_for_each_entry(mcast, &obj->mcast_list, list)
2457                 if (cmd.mlid == mcast->lid &&
2458                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
2459                         list_del(&mcast->list);
2460                         kfree(mcast);
2461                         break;
2462                 }
2463
2464 out_put:
2465         put_qp_write(qp);
2466
2467         return ret ? ret : in_len;
2468 }
2469
2470 static int __uverbs_create_xsrq(struct ib_uverbs_file *file,
2471                                 struct ib_uverbs_create_xsrq *cmd,
2472                                 struct ib_udata *udata)
2473 {
2474         struct ib_uverbs_create_srq_resp resp;
2475         struct ib_usrq_object           *obj;
2476         struct ib_pd                    *pd;
2477         struct ib_srq                   *srq;
2478         struct ib_uobject               *uninitialized_var(xrcd_uobj);
2479         struct ib_srq_init_attr          attr;
2480         int ret;
2481
2482         obj = kmalloc(sizeof *obj, GFP_KERNEL);
2483         if (!obj)
2484                 return -ENOMEM;
2485
2486         init_uobj(&obj->uevent.uobject, cmd->user_handle, file->ucontext, &srq_lock_class);
2487         down_write(&obj->uevent.uobject.mutex);
2488
2489         if (cmd->srq_type == IB_SRQT_XRC) {
2490                 attr.ext.xrc.xrcd  = idr_read_xrcd(cmd->xrcd_handle, file->ucontext, &xrcd_uobj);
2491                 if (!attr.ext.xrc.xrcd) {
2492                         ret = -EINVAL;
2493                         goto err;
2494                 }
2495
2496                 obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, uobject);
2497                 atomic_inc(&obj->uxrcd->refcnt);
2498
2499                 attr.ext.xrc.cq  = idr_read_cq(cmd->cq_handle, file->ucontext, 0);
2500                 if (!attr.ext.xrc.cq) {
2501                         ret = -EINVAL;
2502                         goto err_put_xrcd;
2503                 }
2504         }
2505
2506         pd  = idr_read_pd(cmd->pd_handle, file->ucontext);
2507         if (!pd) {
2508                 ret = -EINVAL;
2509                 goto err_put_cq;
2510         }
2511
2512         attr.event_handler  = ib_uverbs_srq_event_handler;
2513         attr.srq_context    = file;
2514         attr.srq_type       = cmd->srq_type;
2515         attr.attr.max_wr    = cmd->max_wr;
2516         attr.attr.max_sge   = cmd->max_sge;
2517         attr.attr.srq_limit = cmd->srq_limit;
2518
2519         obj->uevent.events_reported = 0;
2520         INIT_LIST_HEAD(&obj->uevent.event_list);
2521
2522         srq = pd->device->create_srq(pd, &attr, udata);
2523         if (IS_ERR(srq)) {
2524                 ret = PTR_ERR(srq);
2525                 goto err_put;
2526         }
2527
2528         srq->device        = pd->device;
2529         srq->pd            = pd;
2530         srq->srq_type      = cmd->srq_type;
2531         srq->uobject       = &obj->uevent.uobject;
2532         srq->event_handler = attr.event_handler;
2533         srq->srq_context   = attr.srq_context;
2534
2535         if (cmd->srq_type == IB_SRQT_XRC) {
2536                 srq->ext.xrc.cq   = attr.ext.xrc.cq;
2537                 srq->ext.xrc.xrcd = attr.ext.xrc.xrcd;
2538                 atomic_inc(&attr.ext.xrc.cq->usecnt);
2539                 atomic_inc(&attr.ext.xrc.xrcd->usecnt);
2540         }
2541
2542         atomic_inc(&pd->usecnt);
2543         atomic_set(&srq->usecnt, 0);
2544
2545         obj->uevent.uobject.object = srq;
2546         ret = idr_add_uobj(&ib_uverbs_srq_idr, &obj->uevent.uobject);
2547         if (ret)
2548                 goto err_destroy;
2549
2550         memset(&resp, 0, sizeof resp);
2551         resp.srq_handle = obj->uevent.uobject.id;
2552         resp.max_wr     = attr.attr.max_wr;
2553         resp.max_sge    = attr.attr.max_sge;
2554         if (cmd->srq_type == IB_SRQT_XRC)
2555                 resp.srqn = srq->ext.xrc.srq_num;
2556
2557         if (copy_to_user((void __user *) (unsigned long) cmd->response,
2558                          &resp, sizeof resp)) {
2559                 ret = -EFAULT;
2560                 goto err_copy;
2561         }
2562
2563         if (cmd->srq_type == IB_SRQT_XRC) {
2564                 put_uobj_read(xrcd_uobj);
2565                 put_cq_read(attr.ext.xrc.cq);
2566         }
2567         put_pd_read(pd);
2568
2569         mutex_lock(&file->mutex);
2570         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->srq_list);
2571         mutex_unlock(&file->mutex);
2572
2573         obj->uevent.uobject.live = 1;
2574
2575         up_write(&obj->uevent.uobject.mutex);
2576
2577         return 0;
2578
2579 err_copy:
2580         idr_remove_uobj(&ib_uverbs_srq_idr, &obj->uevent.uobject);
2581
2582 err_destroy:
2583         ib_destroy_srq(srq);
2584
2585 err_put:
2586         put_pd_read(pd);
2587
2588 err_put_cq:
2589         if (cmd->srq_type == IB_SRQT_XRC)
2590                 put_cq_read(attr.ext.xrc.cq);
2591
2592 err_put_xrcd:
2593         if (cmd->srq_type == IB_SRQT_XRC) {
2594                 atomic_dec(&obj->uxrcd->refcnt);
2595                 put_uobj_read(xrcd_uobj);
2596         }
2597
2598 err:
2599         put_uobj_write(&obj->uevent.uobject);
2600         return ret;
2601 }
2602
2603 ssize_t ib_uverbs_create_srq(struct ib_uverbs_file *file,
2604                              const char __user *buf, int in_len,
2605                              int out_len)
2606 {
2607         struct ib_uverbs_create_srq      cmd;
2608         struct ib_uverbs_create_xsrq     xcmd;
2609         struct ib_uverbs_create_srq_resp resp;
2610         struct ib_udata                  udata;
2611         int ret;
2612
2613         if (out_len < sizeof resp)
2614                 return -ENOSPC;
2615
2616         if (copy_from_user(&cmd, buf, sizeof cmd))
2617                 return -EFAULT;
2618
2619         xcmd.response    = cmd.response;
2620         xcmd.user_handle = cmd.user_handle;
2621         xcmd.srq_type    = IB_SRQT_BASIC;
2622         xcmd.pd_handle   = cmd.pd_handle;
2623         xcmd.max_wr      = cmd.max_wr;
2624         xcmd.max_sge     = cmd.max_sge;
2625         xcmd.srq_limit   = cmd.srq_limit;
2626
2627         INIT_UDATA(&udata, buf + sizeof cmd,
2628                    (unsigned long) cmd.response + sizeof resp,
2629                    in_len - sizeof cmd, out_len - sizeof resp);
2630
2631         ret = __uverbs_create_xsrq(file, &xcmd, &udata);
2632         if (ret)
2633                 return ret;
2634
2635         return in_len;
2636 }
2637
2638 ssize_t ib_uverbs_create_xsrq(struct ib_uverbs_file *file,
2639                               const char __user *buf, int in_len, int out_len)
2640 {
2641         struct ib_uverbs_create_xsrq     cmd;
2642         struct ib_uverbs_create_srq_resp resp;
2643         struct ib_udata                  udata;
2644         int ret;
2645
2646         if (out_len < sizeof resp)
2647                 return -ENOSPC;
2648
2649         if (copy_from_user(&cmd, buf, sizeof cmd))
2650                 return -EFAULT;
2651
2652         INIT_UDATA(&udata, buf + sizeof cmd,
2653                    (unsigned long) cmd.response + sizeof resp,
2654                    in_len - sizeof cmd, out_len - sizeof resp);
2655
2656         ret = __uverbs_create_xsrq(file, &cmd, &udata);
2657         if (ret)
2658                 return ret;
2659
2660         return in_len;
2661 }
2662
2663 ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
2664                              const char __user *buf, int in_len,
2665                              int out_len)
2666 {
2667         struct ib_uverbs_modify_srq cmd;
2668         struct ib_udata             udata;
2669         struct ib_srq              *srq;
2670         struct ib_srq_attr          attr;
2671         int                         ret;
2672
2673         if (copy_from_user(&cmd, buf, sizeof cmd))
2674                 return -EFAULT;
2675
2676         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
2677                    out_len);
2678
2679         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2680         if (!srq)
2681                 return -EINVAL;
2682
2683         attr.max_wr    = cmd.max_wr;
2684         attr.srq_limit = cmd.srq_limit;
2685
2686         ret = srq->device->modify_srq(srq, &attr, cmd.attr_mask, &udata);
2687
2688         put_srq_read(srq);
2689
2690         return ret ? ret : in_len;
2691 }
2692
2693 ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
2694                             const char __user *buf,
2695                             int in_len, int out_len)
2696 {
2697         struct ib_uverbs_query_srq      cmd;
2698         struct ib_uverbs_query_srq_resp resp;
2699         struct ib_srq_attr              attr;
2700         struct ib_srq                   *srq;
2701         int                             ret;
2702
2703         if (out_len < sizeof resp)
2704                 return -ENOSPC;
2705
2706         if (copy_from_user(&cmd, buf, sizeof cmd))
2707                 return -EFAULT;
2708
2709         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2710         if (!srq)
2711                 return -EINVAL;
2712
2713         ret = ib_query_srq(srq, &attr);
2714
2715         put_srq_read(srq);
2716
2717         if (ret)
2718                 return ret;
2719
2720         memset(&resp, 0, sizeof resp);
2721
2722         resp.max_wr    = attr.max_wr;
2723         resp.max_sge   = attr.max_sge;
2724         resp.srq_limit = attr.srq_limit;
2725
2726         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2727                          &resp, sizeof resp))
2728                 return -EFAULT;
2729
2730         return in_len;
2731 }
2732
2733 ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
2734                               const char __user *buf, int in_len,
2735                               int out_len)
2736 {
2737         struct ib_uverbs_destroy_srq      cmd;
2738         struct ib_uverbs_destroy_srq_resp resp;
2739         struct ib_uobject                *uobj;
2740         struct ib_srq                    *srq;
2741         struct ib_uevent_object          *obj;
2742         int                               ret = -EINVAL;
2743
2744         if (copy_from_user(&cmd, buf, sizeof cmd))
2745                 return -EFAULT;
2746
2747         uobj = idr_write_uobj(&ib_uverbs_srq_idr, cmd.srq_handle, file->ucontext);
2748         if (!uobj)
2749                 return -EINVAL;
2750         srq = uobj->object;
2751         obj = container_of(uobj, struct ib_uevent_object, uobject);
2752
2753         ret = ib_destroy_srq(srq);
2754         if (!ret)
2755                 uobj->live = 0;
2756
2757         put_uobj_write(uobj);
2758
2759         if (ret)
2760                 return ret;
2761
2762         idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
2763
2764         mutex_lock(&file->mutex);
2765         list_del(&uobj->list);
2766         mutex_unlock(&file->mutex);
2767
2768         ib_uverbs_release_uevent(file, obj);
2769
2770         memset(&resp, 0, sizeof resp);
2771         resp.events_reported = obj->events_reported;
2772
2773         put_uobj(uobj);
2774
2775         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2776                          &resp, sizeof resp))
2777                 ret = -EFAULT;
2778
2779         return ret ? ret : in_len;
2780 }