drivers/infiniband/core/uverbs_cmd.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006, 2007 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 PathScale, Inc.  All rights reserved.
   5  * Copyright (c) 2006 Mellanox Technologies.  All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/file.h>
  37 #include <linux/fs.h>
  38 #include <linux/slab.h>
  39
  40 #include <asm/uaccess.h>
  41
  42 #include "uverbs.h"
  43
  44 static struct lock_class_key pd_lock_key;
  45 static struct lock_class_key mr_lock_key;
  46 static struct lock_class_key cq_lock_key;
  47 static struct lock_class_key qp_lock_key;
  48 static struct lock_class_key ah_lock_key;
  49 static struct lock_class_key srq_lock_key;
  50 static struct lock_class_key xrcd_lock_key;
  51
  52 #define INIT_UDATA(udata, ibuf, obuf, ilen, olen)                       \
  53         do {                                                            \
  54                 (udata)->inbuf  = (void __user *) (ibuf);               \
  55                 (udata)->outbuf = (void __user *) (obuf);               \
  56                 (udata)->inlen  = (ilen);                               \
  57                 (udata)->outlen = (olen);                               \
  58         } while (0)
  59
  60 /*
  61  * The ib_uobject locking scheme is as follows:
  62  *
  63  * - ib_uverbs_idr_lock protects the uverbs idrs themselves, so it
  64  *   needs to be held during all idr operations.  When an object is
  65  *   looked up, a reference must be taken on the object's kref before
  66  *   dropping this lock.
  67  *
  68  * - Each object also has an rwsem.  This rwsem must be held for
  69  *   reading while an operation that uses the object is performed.
  70  *   For example, while registering an MR, the associated PD's
  71  *   uobject.mutex must be held for reading.  The rwsem must be held
  72  *   for writing while initializing or destroying an object.
  73  *
  74  * - In addition, each object has a "live" flag.  If this flag is not
  75  *   set, then lookups of the object will fail even if it is found in
  76  *   the idr.  This handles a reader that blocks and does not acquire
  77  *   the rwsem until after the object is destroyed.  The destroy
  78  *   operation will set the live flag to 0 and then drop the rwsem;
  79  *   this will allow the reader to acquire the rwsem, see that the
  80  *   live flag is 0, and then drop the rwsem and its reference to
  81  *   object.  The underlying storage will not be freed until the last
  82  *   reference to the object is dropped.
  83  */
  84
  85 static void init_uobj(struct ib_uobject *uobj, u64 user_handle,
  86                       struct ib_ucontext *context, struct lock_class_key *key)
  87 {
  88         uobj->user_handle = user_handle;
  89         uobj->context     = context;
  90         kref_init(&uobj->ref);
  91         init_rwsem(&uobj->mutex);
  92         lockdep_set_class(&uobj->mutex, key);
  93         uobj->live        = 0;
  94 }
  95
  96 static void release_uobj(struct kref *kref)
  97 {
  98         kfree(container_of(kref, struct ib_uobject, ref));
  99 }
 100
 101 static void put_uobj(struct ib_uobject *uobj)
 102 {
 103         kref_put(&uobj->ref, release_uobj);
 104 }
 105
 106 static void put_uobj_read(struct ib_uobject *uobj)
 107 {
 108         up_read(&uobj->mutex);
 109         put_uobj(uobj);
 110 }
 111
 112 static void put_uobj_write(struct ib_uobject *uobj)
 113 {
 114         up_write(&uobj->mutex);
 115         put_uobj(uobj);
 116 }
 117
 118 static int idr_add_uobj(struct idr *idr, struct ib_uobject *uobj)
 119 {
 120         int ret;
 121
 122 retry:
 123         if (!idr_pre_get(idr, GFP_KERNEL))
 124                 return -ENOMEM;
 125
 126         spin_lock(&ib_uverbs_idr_lock);
 127         ret = idr_get_new(idr, uobj, &uobj->id);
 128         spin_unlock(&ib_uverbs_idr_lock);
 129
 130         if (ret == -EAGAIN)
 131                 goto retry;
 132
 133         return ret;
 134 }
 135
 136 void idr_remove_uobj(struct idr *idr, struct ib_uobject *uobj)
 137 {
 138         spin_lock(&ib_uverbs_idr_lock);
 139         idr_remove(idr, uobj->id);
 140         spin_unlock(&ib_uverbs_idr_lock);
 141 }
 142
 143 static struct ib_uobject *__idr_get_uobj(struct idr *idr, int id,
 144                                          struct ib_ucontext *context)
 145 {
 146         struct ib_uobject *uobj;
 147
 148         spin_lock(&ib_uverbs_idr_lock);
 149         uobj = idr_find(idr, id);
 150         if (uobj) {
 151                 if (uobj->context == context)
 152                         kref_get(&uobj->ref);
 153                 else
 154                         uobj = NULL;
 155         }
 156         spin_unlock(&ib_uverbs_idr_lock);
 157
 158         return uobj;
 159 }
 160
 161 static struct ib_uobject *idr_read_uobj(struct idr *idr, int id,
 162                                         struct ib_ucontext *context, int nested)
 163 {
 164         struct ib_uobject *uobj;
 165
 166         uobj = __idr_get_uobj(idr, id, context);
 167         if (!uobj)
 168                 return NULL;
 169
 170         if (nested)
 171                 down_read_nested(&uobj->mutex, SINGLE_DEPTH_NESTING);
 172         else
 173                 down_read(&uobj->mutex);
 174         if (!uobj->live) {
 175                 put_uobj_read(uobj);
 176                 return NULL;
 177         }
 178
 179         return uobj;
 180 }
 181
 182 static struct ib_uobject *idr_write_uobj(struct idr *idr, int id,
 183                                          struct ib_ucontext *context)
 184 {
 185         struct ib_uobject *uobj;
 186
 187         uobj = __idr_get_uobj(idr, id, context);
 188         if (!uobj)
 189                 return NULL;
 190
 191         down_write(&uobj->mutex);
 192         if (!uobj->live) {
 193                 put_uobj_write(uobj);
 194                 return NULL;
 195         }
 196
 197         return uobj;
 198 }
 199
 200 static void *idr_read_obj(struct idr *idr, int id, struct ib_ucontext *context,
 201                           int nested)
 202 {
 203         struct ib_uobject *uobj;
 204
 205         uobj = idr_read_uobj(idr, id, context, nested);
 206         return uobj ? uobj->object : NULL;
 207 }
 208
 209 static struct ib_pd *idr_read_pd(int pd_handle, struct ib_ucontext *context)
 210 {
 211         return idr_read_obj(&ib_uverbs_pd_idr, pd_handle, context, 0);
 212 }
 213
 214 static void put_pd_read(struct ib_pd *pd)
 215 {
 216         put_uobj_read(pd->uobject);
 217 }
 218
 219 static struct ib_cq *idr_read_cq(int cq_handle, struct ib_ucontext *context, int nested)
 220 {
 221         return idr_read_obj(&ib_uverbs_cq_idr, cq_handle, context, nested);
 222 }
 223
 224 static void put_cq_read(struct ib_cq *cq)
 225 {
 226         put_uobj_read(cq->uobject);
 227 }
 228
 229 static struct ib_ah *idr_read_ah(int ah_handle, struct ib_ucontext *context)
 230 {
 231         return idr_read_obj(&ib_uverbs_ah_idr, ah_handle, context, 0);
 232 }
 233
 234 static void put_ah_read(struct ib_ah *ah)
 235 {
 236         put_uobj_read(ah->uobject);
 237 }
 238
 239 static struct ib_qp *idr_read_qp(int qp_handle, struct ib_ucontext *context)
 240 {
 241         return idr_read_obj(&ib_uverbs_qp_idr, qp_handle, context, 0);
 242 }
 243
 244 static struct ib_qp *idr_write_qp(int qp_handle, struct ib_ucontext *context)
 245 {
 246         struct ib_uobject *uobj;
 247
 248         uobj = idr_write_uobj(&ib_uverbs_qp_idr, qp_handle, context);
 249         return uobj ? uobj->object : NULL;
 250 }
 251
 252 static void put_qp_read(struct ib_qp *qp)
 253 {
 254         put_uobj_read(qp->uobject);
 255 }
 256
 257 static void put_qp_write(struct ib_qp *qp)
 258 {
 259         put_uobj_write(qp->uobject);
 260 }
 261
 262 static struct ib_srq *idr_read_srq(int srq_handle, struct ib_ucontext *context)
 263 {
 264         return idr_read_obj(&ib_uverbs_srq_idr, srq_handle, context, 0);
 265 }
 266
 267 static void put_srq_read(struct ib_srq *srq)
 268 {
 269         put_uobj_read(srq->uobject);
 270 }
 271
 272 static struct ib_xrcd *idr_read_xrcd(int xrcd_handle, struct ib_ucontext *context,
 273                                      struct ib_uobject **uobj)
 274 {
 275         *uobj = idr_read_uobj(&ib_uverbs_xrcd_idr, xrcd_handle, context, 0);
 276         return *uobj ? (*uobj)->object : NULL;
 277 }
 278
 279 static void put_xrcd_read(struct ib_uobject *uobj)
 280 {
 281         put_uobj_read(uobj);
 282 }
 283
 284 ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
 285                               const char __user *buf,
 286                               int in_len, int out_len)
 287 {
 288         struct ib_uverbs_get_context      cmd;
 289         struct ib_uverbs_get_context_resp resp;
 290         struct ib_udata                   udata;
 291         struct ib_device                 *ibdev = file->device->ib_dev;
 292         struct ib_ucontext               *ucontext;
 293         struct file                      *filp;
 294         int ret;
 295
 296         if (out_len < sizeof resp)
 297                 return -ENOSPC;
 298
 299         if (copy_from_user(&cmd, buf, sizeof cmd))
 300                 return -EFAULT;
 301
 302         mutex_lock(&file->mutex);
 303
 304         if (file->ucontext) {
 305                 ret = -EINVAL;
 306                 goto err;
 307         }
 308
 309         INIT_UDATA(&udata, buf + sizeof cmd,
 310                    (unsigned long) cmd.response + sizeof resp,
 311                    in_len - sizeof cmd, out_len - sizeof resp);
 312
 313         ucontext = ibdev->alloc_ucontext(ibdev, &udata);
 314         if (IS_ERR(ucontext)) {
 315                 ret = PTR_ERR(ucontext);
 316                 goto err;
 317         }
 318
 319         ucontext->device = ibdev;
 320         INIT_LIST_HEAD(&ucontext->pd_list);
 321         INIT_LIST_HEAD(&ucontext->mr_list);
 322         INIT_LIST_HEAD(&ucontext->mw_list);
 323         INIT_LIST_HEAD(&ucontext->cq_list);
 324         INIT_LIST_HEAD(&ucontext->qp_list);
 325         INIT_LIST_HEAD(&ucontext->srq_list);
 326         INIT_LIST_HEAD(&ucontext->ah_list);
 327         INIT_LIST_HEAD(&ucontext->xrcd_list);
 328         ucontext->closing = 0;
 329
 330         resp.num_comp_vectors = file->device->num_comp_vectors;
 331
 332         ret = get_unused_fd();
 333         if (ret < 0)
 334                 goto err_free;
 335         resp.async_fd = ret;
 336
 337         filp = ib_uverbs_alloc_event_file(file, 1);
 338         if (IS_ERR(filp)) {
 339                 ret = PTR_ERR(filp);
 340                 goto err_fd;
 341         }
 342
 343         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 344                          &resp, sizeof resp)) {
 345                 ret = -EFAULT;
 346                 goto err_file;
 347         }
 348
 349         file->async_file = filp->private_data;
 350
 351         INIT_IB_EVENT_HANDLER(&file->event_handler, file->device->ib_dev,
 352                               ib_uverbs_event_handler);
 353         ret = ib_register_event_handler(&file->event_handler);
 354         if (ret)
 355                 goto err_file;
 356
 357         kref_get(&file->async_file->ref);
 358         kref_get(&file->ref);
 359         file->ucontext = ucontext;
 360
 361         fd_install(resp.async_fd, filp);
 362
 363         mutex_unlock(&file->mutex);
 364
 365         return in_len;
 366
 367 err_file:
 368         fput(filp);
 369
 370 err_fd:
 371         put_unused_fd(resp.async_fd);
 372
 373 err_free:
 374         ibdev->dealloc_ucontext(ucontext);
 375
 376 err:
 377         mutex_unlock(&file->mutex);
 378         return ret;
 379 }
 380
 381 ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
 382                                const char __user *buf,
 383                                int in_len, int out_len)
 384 {
 385         struct ib_uverbs_query_device      cmd;
 386         struct ib_uverbs_query_device_resp resp;
 387         struct ib_device_attr              attr;
 388         int                                ret;
 389
 390         if (out_len < sizeof resp)
 391                 return -ENOSPC;
 392
 393         if (copy_from_user(&cmd, buf, sizeof cmd))
 394                 return -EFAULT;
 395
 396         ret = ib_query_device(file->device->ib_dev, &attr);
 397         if (ret)
 398                 return ret;
 399
 400         memset(&resp, 0, sizeof resp);
 401
 402         resp.fw_ver                    = attr.fw_ver;
 403         resp.node_guid                 = file->device->ib_dev->node_guid;
 404         resp.sys_image_guid            = attr.sys_image_guid;
 405         resp.max_mr_size               = attr.max_mr_size;
 406         resp.page_size_cap             = attr.page_size_cap;
 407         resp.vendor_id                 = attr.vendor_id;
 408         resp.vendor_part_id            = attr.vendor_part_id;
 409         resp.hw_ver                    = attr.hw_ver;
 410         resp.max_qp                    = attr.max_qp;
 411         resp.max_qp_wr                 = attr.max_qp_wr;
 412         resp.device_cap_flags          = attr.device_cap_flags;
 413         resp.max_sge                   = attr.max_sge;
 414         resp.max_sge_rd                = attr.max_sge_rd;
 415         resp.max_cq                    = attr.max_cq;
 416         resp.max_cqe                   = attr.max_cqe;
 417         resp.max_mr                    = attr.max_mr;
 418         resp.max_pd                    = attr.max_pd;
 419         resp.max_qp_rd_atom            = attr.max_qp_rd_atom;
 420         resp.max_ee_rd_atom            = attr.max_ee_rd_atom;
 421         resp.max_res_rd_atom           = attr.max_res_rd_atom;
 422         resp.max_qp_init_rd_atom       = attr.max_qp_init_rd_atom;
 423         resp.max_ee_init_rd_atom       = attr.max_ee_init_rd_atom;
 424         resp.atomic_cap                = attr.atomic_cap;
 425         resp.max_ee                    = attr.max_ee;
 426         resp.max_rdd                   = attr.max_rdd;
 427         resp.max_mw                    = attr.max_mw;
 428         resp.max_raw_ipv6_qp           = attr.max_raw_ipv6_qp;
 429         resp.max_raw_ethy_qp           = attr.max_raw_ethy_qp;
 430         resp.max_mcast_grp             = attr.max_mcast_grp;
 431         resp.max_mcast_qp_attach       = attr.max_mcast_qp_attach;
 432         resp.max_total_mcast_qp_attach = attr.max_total_mcast_qp_attach;
 433         resp.max_ah                    = attr.max_ah;
 434         resp.max_fmr                   = attr.max_fmr;
 435         resp.max_map_per_fmr           = attr.max_map_per_fmr;
 436         resp.max_srq                   = attr.max_srq;
 437         resp.max_srq_wr                = attr.max_srq_wr;
 438         resp.max_srq_sge               = attr.max_srq_sge;
 439         resp.max_pkeys                 = attr.max_pkeys;
 440         resp.local_ca_ack_delay        = attr.local_ca_ack_delay;
 441         resp.phys_port_cnt             = file->device->ib_dev->phys_port_cnt;
 442
 443         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 444                          &resp, sizeof resp))
 445                 return -EFAULT;
 446
 447         return in_len;
 448 }
 449
 450 ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
 451                              const char __user *buf,
 452                              int in_len, int out_len)
 453 {
 454         struct ib_uverbs_query_port      cmd;
 455         struct ib_uverbs_query_port_resp resp;
 456         struct ib_port_attr              attr;
 457         int                              ret;
 458
 459         if (out_len < sizeof resp)
 460                 return -ENOSPC;
 461
 462         if (copy_from_user(&cmd, buf, sizeof cmd))
 463                 return -EFAULT;
 464
 465         ret = ib_query_port(file->device->ib_dev, cmd.port_num, &attr);
 466         if (ret)
 467                 return ret;
 468
 469         memset(&resp, 0, sizeof resp);
 470
 471         resp.state           = attr.state;
 472         resp.max_mtu         = attr.max_mtu;
 473         resp.active_mtu      = attr.active_mtu;
 474         resp.gid_tbl_len     = attr.gid_tbl_len;
 475         resp.port_cap_flags  = attr.port_cap_flags;
 476         resp.max_msg_sz      = attr.max_msg_sz;
 477         resp.bad_pkey_cntr   = attr.bad_pkey_cntr;
 478         resp.qkey_viol_cntr  = attr.qkey_viol_cntr;
 479         resp.pkey_tbl_len    = attr.pkey_tbl_len;
 480         resp.lid             = attr.lid;
 481         resp.sm_lid          = attr.sm_lid;
 482         resp.lmc             = attr.lmc;
 483         resp.max_vl_num      = attr.max_vl_num;
 484         resp.sm_sl           = attr.sm_sl;
 485         resp.subnet_timeout  = attr.subnet_timeout;
 486         resp.init_type_reply = attr.init_type_reply;
 487         resp.active_width    = attr.active_width;
 488         resp.active_speed    = attr.active_speed;
 489         resp.phys_state      = attr.phys_state;
 490         resp.link_layer      = rdma_port_get_link_layer(file->device->ib_dev,
 491                                                         cmd.port_num);
 492
 493         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 494                          &resp, sizeof resp))
 495                 return -EFAULT;
 496
 497         return in_len;
 498 }
 499
 500 ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
 501                            const char __user *buf,
 502                            int in_len, int out_len)
 503 {
 504         struct ib_uverbs_alloc_pd      cmd;
 505         struct ib_uverbs_alloc_pd_resp resp;
 506         struct ib_udata                udata;
 507         struct ib_uobject             *uobj;
 508         struct ib_pd                  *pd;
 509         int                            ret;
 510
 511         if (out_len < sizeof resp)
 512                 return -ENOSPC;
 513
 514         if (copy_from_user(&cmd, buf, sizeof cmd))
 515                 return -EFAULT;
 516
 517         INIT_UDATA(&udata, buf + sizeof cmd,
 518                    (unsigned long) cmd.response + sizeof resp,
 519                    in_len - sizeof cmd, out_len - sizeof resp);
 520
 521         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
 522         if (!uobj)
 523                 return -ENOMEM;
 524
 525         init_uobj(uobj, 0, file->ucontext, &pd_lock_key);
 526         down_write(&uobj->mutex);
 527
 528         pd = file->device->ib_dev->alloc_pd(file->device->ib_dev,
 529                                             file->ucontext, &udata);
 530         if (IS_ERR(pd)) {
 531                 ret = PTR_ERR(pd);
 532                 goto err;
 533         }
 534
 535         pd->device  = file->device->ib_dev;
 536         pd->uobject = uobj;
 537         atomic_set(&pd->usecnt, 0);
 538
 539         uobj->object = pd;
 540         ret = idr_add_uobj(&ib_uverbs_pd_idr, uobj);
 541         if (ret)
 542                 goto err_idr;
 543
 544         memset(&resp, 0, sizeof resp);
 545         resp.pd_handle = uobj->id;
 546
 547         if (copy_to_user((void __user *) (unsigned long) cmd.response,
 548                          &resp, sizeof resp)) {
 549                 ret = -EFAULT;
 550                 goto err_copy;
 551         }
 552
 553         mutex_lock(&file->mutex);
 554         list_add_tail(&uobj->list, &file->ucontext->pd_list);
 555         mutex_unlock(&file->mutex);
 556
 557         uobj->live = 1;
 558
 559         up_write(&uobj->mutex);
 560
 561         return in_len;
 562
 563 err_copy:
 564         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 565
 566 err_idr:
 567         ib_dealloc_pd(pd);
 568
 569 err:
 570         put_uobj_write(uobj);
 571         return ret;
 572 }
 573
 574 ssize_t ib_uverbs_dealloc_pd(struct ib_uverbs_file *file,
 575                              const char __user *buf,
 576                              int in_len, int out_len)
 577 {
 578         struct ib_uverbs_dealloc_pd cmd;
 579         struct ib_uobject          *uobj;
 580         int                         ret;
 581
 582         if (copy_from_user(&cmd, buf, sizeof cmd))
 583                 return -EFAULT;
 584
 585         uobj = idr_write_uobj(&ib_uverbs_pd_idr, cmd.pd_handle, file->ucontext);
 586         if (!uobj)
 587                 return -EINVAL;
 588
 589         ret = ib_dealloc_pd(uobj->object);
 590         if (!ret)
 591                 uobj->live = 0;
 592
 593         put_uobj_write(uobj);
 594
 595         if (ret)
 596                 return ret;
 597
 598         idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 599
 600         mutex_lock(&file->mutex);
 601         list_del(&uobj->list);
 602         mutex_unlock(&file->mutex);
 603
 604         put_uobj(uobj);
 605
 606         return in_len;
 607 }
 608
 609 struct xrcd_table_entry {
 610         struct rb_node  node;
 611         struct ib_xrcd *xrcd;
 612         struct inode   *inode;
 613 };
 614
 615 static int xrcd_table_insert(struct ib_uverbs_device *dev,
 616                             struct inode *inode,
 617                             struct ib_xrcd *xrcd)
 618 {
 619         struct xrcd_table_entry *entry, *scan;
 620         struct rb_node **p = &dev->xrcd_tree.rb_node;
 621         struct rb_node *parent = NULL;
 622
 623         entry = kmalloc(sizeof *entry, GFP_KERNEL);
 624         if (!entry)
 625                 return -ENOMEM;
 626
 627         entry->xrcd  = xrcd;
 628         entry->inode = inode;
 629
 630         while (*p) {
 631                 parent = *p;
 632                 scan = rb_entry(parent, struct xrcd_table_entry, node);
 633
 634                 if (inode < scan->inode) {
 635                         p = &(*p)->rb_left;
 636                 } else if (inode > scan->inode) {
 637                         p = &(*p)->rb_right;
 638                 } else {
 639                         kfree(entry);
 640                         return -EEXIST;
 641                 }
 642         }
 643
 644         rb_link_node(&entry->node, parent, p);
 645         rb_insert_color(&entry->node, &dev->xrcd_tree);
 646         igrab(inode);
 647         return 0;
 648 }
 649
 650 static struct xrcd_table_entry *xrcd_table_search(struct ib_uverbs_device *dev,
 651                                                   struct inode *inode)
 652 {
 653         struct xrcd_table_entry *entry;
 654         struct rb_node *p = dev->xrcd_tree.rb_node;
 655
 656         while (p) {
 657                 entry = rb_entry(p, struct xrcd_table_entry, node);
 658
 659                 if (inode < entry->inode)
 660                         p = p->rb_left;
 661                 else if (inode > entry->inode)
 662                         p = p->rb_right;
 663                 else
 664                         return entry;
 665         }
 666
 667         return NULL;
 668 }
 669
 670 static struct ib_xrcd *find_xrcd(struct ib_uverbs_device *dev, struct inode *inode)
 671 {
 672         struct xrcd_table_entry *entry;
 673
 674         entry = xrcd_table_search(dev, inode);
 675         if (!entry)
 676                 return NULL;
 677
 678         return entry->xrcd;
 679 }
 680
 681 static void xrcd_table_delete(struct ib_uverbs_device *dev,
 682                               struct inode *inode)
 683 {
 684         struct xrcd_table_entry *entry;
 685
 686         entry = xrcd_table_search(dev, inode);
 687         if (entry) {
 688                 iput(inode);
 689                 rb_erase(&entry->node, &dev->xrcd_tree);
 690                 kfree(entry);
 691         }
 692 }
 693
 694 ssize_t ib_uverbs_open_xrcd(struct ib_uverbs_file *file,
 695                             const char __user *buf, int in_len,
 696                             int out_len)
 697 {
 698         struct ib_uverbs_open_xrcd      cmd;
 699         struct ib_uverbs_open_xrcd_resp resp;
 700         struct ib_udata                 udata;
 701         struct ib_uxrcd_object         *obj;
 702         struct ib_xrcd                 *xrcd = NULL;
 703         struct file                    *f = NULL;
 704         struct inode                   *inode = NULL;
 705         int                             ret = 0;
 706         int                             new_xrcd = 0;
 707
 708         if (out_len < sizeof resp)
 709                 return -ENOSPC;
 710
 711         if (copy_from_user(&cmd, buf, sizeof cmd))
 712                 return -EFAULT;
 713
 714         INIT_UDATA(&udata, buf + sizeof cmd,
 715                    (unsigned long) cmd.response + sizeof resp,
 716                    in_len - sizeof cmd, out_len - sizeof  resp);
 717
 718         mutex_lock(&file->device->xrcd_tree_mutex);
 719
 720         if (cmd.fd != -1) {
 721                 /* search for file descriptor */
 722                 f = fget(cmd.fd);
 723                 if (!f) {
 724                         ret = -EBADF;
 725                         goto err_tree_mutex_unlock;
 726                 }
 727
 728                 inode = f->f_dentry->d_inode;
 729                 if (!inode) {
 730                         ret = -EBADF;
 731                         goto err_tree_mutex_unlock;
 732                 }
 733
 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_key);
 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)
 799                 fput(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)
 829                 fput(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_key);
 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_key);
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         INIT_UDATA(&udata, buf + sizeof cmd,
1403                    (unsigned long) cmd.response + sizeof resp,
1404                    in_len - sizeof cmd, out_len - sizeof resp);
1405
1406         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1407         if (!obj)
1408                 return -ENOMEM;
1409
1410         init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_key);
1411         down_write(&obj->uevent.uobject.mutex);
1412
1413         if (cmd.qp_type == IB_QPT_XRC_TGT) {
1414                 xrcd = idr_read_xrcd(cmd.pd_handle, file->ucontext, &xrcd_uobj);
1415                 if (!xrcd) {
1416                         ret = -EINVAL;
1417                         goto err_put;
1418                 }
1419                 device = xrcd->device;
1420         } else {
1421                 pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
1422                 scq = idr_read_cq(cmd.send_cq_handle, file->ucontext, 0);
1423                 if (!pd || !scq) {
1424                         ret = -EINVAL;
1425                         goto err_put;
1426                 }
1427
1428                 if (cmd.qp_type == IB_QPT_XRC_INI) {
1429                         cmd.max_recv_wr = cmd.max_recv_sge = 0;
1430                 } else {
1431                         if (cmd.is_srq) {
1432                                 srq = idr_read_srq(cmd.srq_handle, file->ucontext);
1433                                 if (!srq || srq->srq_type != IB_SRQT_BASIC) {
1434                                         ret = -EINVAL;
1435                                         goto err_put;
1436                                 }
1437                         }
1438                         rcq = (cmd.recv_cq_handle == cmd.send_cq_handle) ?
1439                                scq : idr_read_cq(cmd.recv_cq_handle, file->ucontext, 1);
1440                         if (!rcq) {
1441                                 ret = -EINVAL;
1442                                 goto err_put;
1443                         }
1444                 }
1445                 device = pd->device;
1446         }
1447
1448         attr.event_handler = ib_uverbs_qp_event_handler;
1449         attr.qp_context    = file;
1450         attr.send_cq       = scq;
1451         attr.recv_cq       = rcq;
1452         attr.srq           = srq;
1453         attr.xrcd          = xrcd;
1454         attr.sq_sig_type   = cmd.sq_sig_all ? IB_SIGNAL_ALL_WR : IB_SIGNAL_REQ_WR;
1455         attr.qp_type       = cmd.qp_type;
1456         attr.create_flags  = 0;
1457
1458         attr.cap.max_send_wr     = cmd.max_send_wr;
1459         attr.cap.max_recv_wr     = cmd.max_recv_wr;
1460         attr.cap.max_send_sge    = cmd.max_send_sge;
1461         attr.cap.max_recv_sge    = cmd.max_recv_sge;
1462         attr.cap.max_inline_data = cmd.max_inline_data;
1463
1464         obj->uevent.events_reported     = 0;
1465         INIT_LIST_HEAD(&obj->uevent.event_list);
1466         INIT_LIST_HEAD(&obj->mcast_list);
1467
1468         if (cmd.qp_type == IB_QPT_XRC_TGT)
1469                 qp = ib_create_qp(pd, &attr);
1470         else
1471                 qp = device->create_qp(pd, &attr, &udata);
1472
1473         if (IS_ERR(qp)) {
1474                 ret = PTR_ERR(qp);
1475                 goto err_put;
1476         }
1477
1478         if (cmd.qp_type != IB_QPT_XRC_TGT) {
1479                 qp->real_qp       = qp;
1480                 qp->device        = device;
1481                 qp->pd            = pd;
1482                 qp->send_cq       = attr.send_cq;
1483                 qp->recv_cq       = attr.recv_cq;
1484                 qp->srq           = attr.srq;
1485                 qp->event_handler = attr.event_handler;
1486                 qp->qp_context    = attr.qp_context;
1487                 qp->qp_type       = attr.qp_type;
1488                 atomic_inc(&pd->usecnt);
1489                 atomic_inc(&attr.send_cq->usecnt);
1490                 if (attr.recv_cq)
1491                         atomic_inc(&attr.recv_cq->usecnt);
1492                 if (attr.srq)
1493                         atomic_inc(&attr.srq->usecnt);
1494         }
1495         qp->uobject = &obj->uevent.uobject;
1496
1497         obj->uevent.uobject.object = qp;
1498         ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1499         if (ret)
1500                 goto err_destroy;
1501
1502         memset(&resp, 0, sizeof resp);
1503         resp.qpn             = qp->qp_num;
1504         resp.qp_handle       = obj->uevent.uobject.id;
1505         resp.max_recv_sge    = attr.cap.max_recv_sge;
1506         resp.max_send_sge    = attr.cap.max_send_sge;
1507         resp.max_recv_wr     = attr.cap.max_recv_wr;
1508         resp.max_send_wr     = attr.cap.max_send_wr;
1509         resp.max_inline_data = attr.cap.max_inline_data;
1510
1511         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1512                          &resp, sizeof resp)) {
1513                 ret = -EFAULT;
1514                 goto err_copy;
1515         }
1516
1517         if (xrcd)
1518                 put_xrcd_read(xrcd_uobj);
1519         if (pd)
1520                 put_pd_read(pd);
1521         if (scq)
1522                 put_cq_read(scq);
1523         if (rcq && rcq != scq)
1524                 put_cq_read(rcq);
1525         if (srq)
1526                 put_srq_read(srq);
1527
1528         mutex_lock(&file->mutex);
1529         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1530         mutex_unlock(&file->mutex);
1531
1532         obj->uevent.uobject.live = 1;
1533
1534         up_write(&obj->uevent.uobject.mutex);
1535
1536         return in_len;
1537
1538 err_copy:
1539         idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1540
1541 err_destroy:
1542         ib_destroy_qp(qp);
1543
1544 err_put:
1545         if (xrcd)
1546                 put_xrcd_read(xrcd_uobj);
1547         if (pd)
1548                 put_pd_read(pd);
1549         if (scq)
1550                 put_cq_read(scq);
1551         if (rcq && rcq != scq)
1552                 put_cq_read(rcq);
1553         if (srq)
1554                 put_srq_read(srq);
1555
1556         put_uobj_write(&obj->uevent.uobject);
1557         return ret;
1558 }
1559
1560 ssize_t ib_uverbs_open_qp(struct ib_uverbs_file *file,
1561                           const char __user *buf, int in_len, int out_len)
1562 {
1563         struct ib_uverbs_open_qp        cmd;
1564         struct ib_uverbs_create_qp_resp resp;
1565         struct ib_udata                 udata;
1566         struct ib_uqp_object           *obj;
1567         struct ib_xrcd                 *xrcd;
1568         struct ib_uobject              *uninitialized_var(xrcd_uobj);
1569         struct ib_qp                   *qp;
1570         struct ib_qp_open_attr          attr;
1571         int ret;
1572
1573         if (out_len < sizeof resp)
1574                 return -ENOSPC;
1575
1576         if (copy_from_user(&cmd, buf, sizeof cmd))
1577                 return -EFAULT;
1578
1579         INIT_UDATA(&udata, buf + sizeof cmd,
1580                    (unsigned long) cmd.response + sizeof resp,
1581                    in_len - sizeof cmd, out_len - sizeof resp);
1582
1583         obj = kmalloc(sizeof *obj, GFP_KERNEL);
1584         if (!obj)
1585                 return -ENOMEM;
1586
1587         init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_key);
1588         down_write(&obj->uevent.uobject.mutex);
1589
1590         xrcd = idr_read_xrcd(cmd.pd_handle, file->ucontext, &xrcd_uobj);
1591         if (!xrcd) {
1592                 ret = -EINVAL;
1593                 goto err_put;
1594         }
1595
1596         attr.event_handler = ib_uverbs_qp_event_handler;
1597         attr.qp_context    = file;
1598         attr.qp_num        = cmd.qpn;
1599         attr.qp_type       = cmd.qp_type;
1600
1601         obj->uevent.events_reported = 0;
1602         INIT_LIST_HEAD(&obj->uevent.event_list);
1603         INIT_LIST_HEAD(&obj->mcast_list);
1604
1605         qp = ib_open_qp(xrcd, &attr);
1606         if (IS_ERR(qp)) {
1607                 ret = PTR_ERR(qp);
1608                 goto err_put;
1609         }
1610
1611         qp->uobject = &obj->uevent.uobject;
1612
1613         obj->uevent.uobject.object = qp;
1614         ret = idr_add_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1615         if (ret)
1616                 goto err_destroy;
1617
1618         memset(&resp, 0, sizeof resp);
1619         resp.qpn       = qp->qp_num;
1620         resp.qp_handle = obj->uevent.uobject.id;
1621
1622         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1623                          &resp, sizeof resp)) {
1624                 ret = -EFAULT;
1625                 goto err_remove;
1626         }
1627
1628         put_xrcd_read(xrcd_uobj);
1629
1630         mutex_lock(&file->mutex);
1631         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
1632         mutex_unlock(&file->mutex);
1633
1634         obj->uevent.uobject.live = 1;
1635
1636         up_write(&obj->uevent.uobject.mutex);
1637
1638         return in_len;
1639
1640 err_remove:
1641         idr_remove_uobj(&ib_uverbs_qp_idr, &obj->uevent.uobject);
1642
1643 err_destroy:
1644         ib_destroy_qp(qp);
1645
1646 err_put:
1647         put_xrcd_read(xrcd_uobj);
1648         put_uobj_write(&obj->uevent.uobject);
1649         return ret;
1650 }
1651
1652 ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
1653                            const char __user *buf, int in_len,
1654                            int out_len)
1655 {
1656         struct ib_uverbs_query_qp      cmd;
1657         struct ib_uverbs_query_qp_resp resp;
1658         struct ib_qp                   *qp;
1659         struct ib_qp_attr              *attr;
1660         struct ib_qp_init_attr         *init_attr;
1661         int                            ret;
1662
1663         if (copy_from_user(&cmd, buf, sizeof cmd))
1664                 return -EFAULT;
1665
1666         attr      = kmalloc(sizeof *attr, GFP_KERNEL);
1667         init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
1668         if (!attr || !init_attr) {
1669                 ret = -ENOMEM;
1670                 goto out;
1671         }
1672
1673         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1674         if (!qp) {
1675                 ret = -EINVAL;
1676                 goto out;
1677         }
1678
1679         ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
1680
1681         put_qp_read(qp);
1682
1683         if (ret)
1684                 goto out;
1685
1686         memset(&resp, 0, sizeof resp);
1687
1688         resp.qp_state               = attr->qp_state;
1689         resp.cur_qp_state           = attr->cur_qp_state;
1690         resp.path_mtu               = attr->path_mtu;
1691         resp.path_mig_state         = attr->path_mig_state;
1692         resp.qkey                   = attr->qkey;
1693         resp.rq_psn                 = attr->rq_psn;
1694         resp.sq_psn                 = attr->sq_psn;
1695         resp.dest_qp_num            = attr->dest_qp_num;
1696         resp.qp_access_flags        = attr->qp_access_flags;
1697         resp.pkey_index             = attr->pkey_index;
1698         resp.alt_pkey_index         = attr->alt_pkey_index;
1699         resp.sq_draining            = attr->sq_draining;
1700         resp.max_rd_atomic          = attr->max_rd_atomic;
1701         resp.max_dest_rd_atomic     = attr->max_dest_rd_atomic;
1702         resp.min_rnr_timer          = attr->min_rnr_timer;
1703         resp.port_num               = attr->port_num;
1704         resp.timeout                = attr->timeout;
1705         resp.retry_cnt              = attr->retry_cnt;
1706         resp.rnr_retry              = attr->rnr_retry;
1707         resp.alt_port_num           = attr->alt_port_num;
1708         resp.alt_timeout            = attr->alt_timeout;
1709
1710         memcpy(resp.dest.dgid, attr->ah_attr.grh.dgid.raw, 16);
1711         resp.dest.flow_label        = attr->ah_attr.grh.flow_label;
1712         resp.dest.sgid_index        = attr->ah_attr.grh.sgid_index;
1713         resp.dest.hop_limit         = attr->ah_attr.grh.hop_limit;
1714         resp.dest.traffic_class     = attr->ah_attr.grh.traffic_class;
1715         resp.dest.dlid              = attr->ah_attr.dlid;
1716         resp.dest.sl                = attr->ah_attr.sl;
1717         resp.dest.src_path_bits     = attr->ah_attr.src_path_bits;
1718         resp.dest.static_rate       = attr->ah_attr.static_rate;
1719         resp.dest.is_global         = !!(attr->ah_attr.ah_flags & IB_AH_GRH);
1720         resp.dest.port_num          = attr->ah_attr.port_num;
1721
1722         memcpy(resp.alt_dest.dgid, attr->alt_ah_attr.grh.dgid.raw, 16);
1723         resp.alt_dest.flow_label    = attr->alt_ah_attr.grh.flow_label;
1724         resp.alt_dest.sgid_index    = attr->alt_ah_attr.grh.sgid_index;
1725         resp.alt_dest.hop_limit     = attr->alt_ah_attr.grh.hop_limit;
1726         resp.alt_dest.traffic_class = attr->alt_ah_attr.grh.traffic_class;
1727         resp.alt_dest.dlid          = attr->alt_ah_attr.dlid;
1728         resp.alt_dest.sl            = attr->alt_ah_attr.sl;
1729         resp.alt_dest.src_path_bits = attr->alt_ah_attr.src_path_bits;
1730         resp.alt_dest.static_rate   = attr->alt_ah_attr.static_rate;
1731         resp.alt_dest.is_global     = !!(attr->alt_ah_attr.ah_flags & IB_AH_GRH);
1732         resp.alt_dest.port_num      = attr->alt_ah_attr.port_num;
1733
1734         resp.max_send_wr            = init_attr->cap.max_send_wr;
1735         resp.max_recv_wr            = init_attr->cap.max_recv_wr;
1736         resp.max_send_sge           = init_attr->cap.max_send_sge;
1737         resp.max_recv_sge           = init_attr->cap.max_recv_sge;
1738         resp.max_inline_data        = init_attr->cap.max_inline_data;
1739         resp.sq_sig_all             = init_attr->sq_sig_type == IB_SIGNAL_ALL_WR;
1740
1741         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1742                          &resp, sizeof resp))
1743                 ret = -EFAULT;
1744
1745 out:
1746         kfree(attr);
1747         kfree(init_attr);
1748
1749         return ret ? ret : in_len;
1750 }
1751
1752 /* Remove ignored fields set in the attribute mask */
1753 static int modify_qp_mask(enum ib_qp_type qp_type, int mask)
1754 {
1755         switch (qp_type) {
1756         case IB_QPT_XRC_INI:
1757                 return mask & ~(IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER);
1758         case IB_QPT_XRC_TGT:
1759                 return mask & ~(IB_QP_MAX_QP_RD_ATOMIC | IB_QP_RETRY_CNT |
1760                                 IB_QP_RNR_RETRY);
1761         default:
1762                 return mask;
1763         }
1764 }
1765
1766 ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file,
1767                             const char __user *buf, int in_len,
1768                             int out_len)
1769 {
1770         struct ib_uverbs_modify_qp cmd;
1771         struct ib_udata            udata;
1772         struct ib_qp              *qp;
1773         struct ib_qp_attr         *attr;
1774         int                        ret;
1775
1776         if (copy_from_user(&cmd, buf, sizeof cmd))
1777                 return -EFAULT;
1778
1779         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
1780                    out_len);
1781
1782         attr = kmalloc(sizeof *attr, GFP_KERNEL);
1783         if (!attr)
1784                 return -ENOMEM;
1785
1786         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1787         if (!qp) {
1788                 ret = -EINVAL;
1789                 goto out;
1790         }
1791
1792         attr->qp_state            = cmd.qp_state;
1793         attr->cur_qp_state        = cmd.cur_qp_state;
1794         attr->path_mtu            = cmd.path_mtu;
1795         attr->path_mig_state      = cmd.path_mig_state;
1796         attr->qkey                = cmd.qkey;
1797         attr->rq_psn              = cmd.rq_psn;
1798         attr->sq_psn              = cmd.sq_psn;
1799         attr->dest_qp_num         = cmd.dest_qp_num;
1800         attr->qp_access_flags     = cmd.qp_access_flags;
1801         attr->pkey_index          = cmd.pkey_index;
1802         attr->alt_pkey_index      = cmd.alt_pkey_index;
1803         attr->en_sqd_async_notify = cmd.en_sqd_async_notify;
1804         attr->max_rd_atomic       = cmd.max_rd_atomic;
1805         attr->max_dest_rd_atomic  = cmd.max_dest_rd_atomic;
1806         attr->min_rnr_timer       = cmd.min_rnr_timer;
1807         attr->port_num            = cmd.port_num;
1808         attr->timeout             = cmd.timeout;
1809         attr->retry_cnt           = cmd.retry_cnt;
1810         attr->rnr_retry           = cmd.rnr_retry;
1811         attr->alt_port_num        = cmd.alt_port_num;
1812         attr->alt_timeout         = cmd.alt_timeout;
1813
1814         memcpy(attr->ah_attr.grh.dgid.raw, cmd.dest.dgid, 16);
1815         attr->ah_attr.grh.flow_label        = cmd.dest.flow_label;
1816         attr->ah_attr.grh.sgid_index        = cmd.dest.sgid_index;
1817         attr->ah_attr.grh.hop_limit         = cmd.dest.hop_limit;
1818         attr->ah_attr.grh.traffic_class     = cmd.dest.traffic_class;
1819         attr->ah_attr.dlid                  = cmd.dest.dlid;
1820         attr->ah_attr.sl                    = cmd.dest.sl;
1821         attr->ah_attr.src_path_bits         = cmd.dest.src_path_bits;
1822         attr->ah_attr.static_rate           = cmd.dest.static_rate;
1823         attr->ah_attr.ah_flags              = cmd.dest.is_global ? IB_AH_GRH : 0;
1824         attr->ah_attr.port_num              = cmd.dest.port_num;
1825
1826         memcpy(attr->alt_ah_attr.grh.dgid.raw, cmd.alt_dest.dgid, 16);
1827         attr->alt_ah_attr.grh.flow_label    = cmd.alt_dest.flow_label;
1828         attr->alt_ah_attr.grh.sgid_index    = cmd.alt_dest.sgid_index;
1829         attr->alt_ah_attr.grh.hop_limit     = cmd.alt_dest.hop_limit;
1830         attr->alt_ah_attr.grh.traffic_class = cmd.alt_dest.traffic_class;
1831         attr->alt_ah_attr.dlid              = cmd.alt_dest.dlid;
1832         attr->alt_ah_attr.sl                = cmd.alt_dest.sl;
1833         attr->alt_ah_attr.src_path_bits     = cmd.alt_dest.src_path_bits;
1834         attr->alt_ah_attr.static_rate       = cmd.alt_dest.static_rate;
1835         attr->alt_ah_attr.ah_flags          = cmd.alt_dest.is_global ? IB_AH_GRH : 0;
1836         attr->alt_ah_attr.port_num          = cmd.alt_dest.port_num;
1837
1838         if (qp->real_qp == qp) {
1839                 ret = qp->device->modify_qp(qp, attr,
1840                         modify_qp_mask(qp->qp_type, cmd.attr_mask), &udata);
1841         } else {
1842                 ret = ib_modify_qp(qp, attr, modify_qp_mask(qp->qp_type, cmd.attr_mask));
1843         }
1844
1845         put_qp_read(qp);
1846
1847         if (ret)
1848                 goto out;
1849
1850         ret = in_len;
1851
1852 out:
1853         kfree(attr);
1854
1855         return ret;
1856 }
1857
1858 ssize_t ib_uverbs_destroy_qp(struct ib_uverbs_file *file,
1859                              const char __user *buf, int in_len,
1860                              int out_len)
1861 {
1862         struct ib_uverbs_destroy_qp      cmd;
1863         struct ib_uverbs_destroy_qp_resp resp;
1864         struct ib_uobject               *uobj;
1865         struct ib_qp                    *qp;
1866         struct ib_uqp_object            *obj;
1867         int                              ret = -EINVAL;
1868
1869         if (copy_from_user(&cmd, buf, sizeof cmd))
1870                 return -EFAULT;
1871
1872         memset(&resp, 0, sizeof resp);
1873
1874         uobj = idr_write_uobj(&ib_uverbs_qp_idr, cmd.qp_handle, file->ucontext);
1875         if (!uobj)
1876                 return -EINVAL;
1877         qp  = uobj->object;
1878         obj = container_of(uobj, struct ib_uqp_object, uevent.uobject);
1879
1880         if (!list_empty(&obj->mcast_list)) {
1881                 put_uobj_write(uobj);
1882                 return -EBUSY;
1883         }
1884
1885         ret = ib_destroy_qp(qp);
1886         if (!ret)
1887                 uobj->live = 0;
1888
1889         put_uobj_write(uobj);
1890
1891         if (ret)
1892                 return ret;
1893
1894         idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
1895
1896         mutex_lock(&file->mutex);
1897         list_del(&uobj->list);
1898         mutex_unlock(&file->mutex);
1899
1900         ib_uverbs_release_uevent(file, &obj->uevent);
1901
1902         resp.events_reported = obj->uevent.events_reported;
1903
1904         put_uobj(uobj);
1905
1906         if (copy_to_user((void __user *) (unsigned long) cmd.response,
1907                          &resp, sizeof resp))
1908                 return -EFAULT;
1909
1910         return in_len;
1911 }
1912
1913 ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
1914                             const char __user *buf, int in_len,
1915                             int out_len)
1916 {
1917         struct ib_uverbs_post_send      cmd;
1918         struct ib_uverbs_post_send_resp resp;
1919         struct ib_uverbs_send_wr       *user_wr;
1920         struct ib_send_wr              *wr = NULL, *last, *next, *bad_wr;
1921         struct ib_qp                   *qp;
1922         int                             i, sg_ind;
1923         int                             is_ud;
1924         ssize_t                         ret = -EINVAL;
1925
1926         if (copy_from_user(&cmd, buf, sizeof cmd))
1927                 return -EFAULT;
1928
1929         if (in_len < sizeof cmd + cmd.wqe_size * cmd.wr_count +
1930             cmd.sge_count * sizeof (struct ib_uverbs_sge))
1931                 return -EINVAL;
1932
1933         if (cmd.wqe_size < sizeof (struct ib_uverbs_send_wr))
1934                 return -EINVAL;
1935
1936         user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL);
1937         if (!user_wr)
1938                 return -ENOMEM;
1939
1940         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
1941         if (!qp)
1942                 goto out;
1943
1944         is_ud = qp->qp_type == IB_QPT_UD;
1945         sg_ind = 0;
1946         last = NULL;
1947         for (i = 0; i < cmd.wr_count; ++i) {
1948                 if (copy_from_user(user_wr,
1949                                    buf + sizeof cmd + i * cmd.wqe_size,
1950                                    cmd.wqe_size)) {
1951                         ret = -EFAULT;
1952                         goto out_put;
1953                 }
1954
1955                 if (user_wr->num_sge + sg_ind > cmd.sge_count) {
1956                         ret = -EINVAL;
1957                         goto out_put;
1958                 }
1959
1960                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
1961                                user_wr->num_sge * sizeof (struct ib_sge),
1962                                GFP_KERNEL);
1963                 if (!next) {
1964                         ret = -ENOMEM;
1965                         goto out_put;
1966                 }
1967
1968                 if (!last)
1969                         wr = next;
1970                 else
1971                         last->next = next;
1972                 last = next;
1973
1974                 next->next       = NULL;
1975                 next->wr_id      = user_wr->wr_id;
1976                 next->num_sge    = user_wr->num_sge;
1977                 next->opcode     = user_wr->opcode;
1978                 next->send_flags = user_wr->send_flags;
1979
1980                 if (is_ud) {
1981                         next->wr.ud.ah = idr_read_ah(user_wr->wr.ud.ah,
1982                                                      file->ucontext);
1983                         if (!next->wr.ud.ah) {
1984                                 ret = -EINVAL;
1985                                 goto out_put;
1986                         }
1987                         next->wr.ud.remote_qpn  = user_wr->wr.ud.remote_qpn;
1988                         next->wr.ud.remote_qkey = user_wr->wr.ud.remote_qkey;
1989                 } else {
1990                         switch (next->opcode) {
1991                         case IB_WR_RDMA_WRITE_WITH_IMM:
1992                                 next->ex.imm_data =
1993                                         (__be32 __force) user_wr->ex.imm_data;
1994                         case IB_WR_RDMA_WRITE:
1995                         case IB_WR_RDMA_READ:
1996                                 next->wr.rdma.remote_addr =
1997                                         user_wr->wr.rdma.remote_addr;
1998                                 next->wr.rdma.rkey        =
1999                                         user_wr->wr.rdma.rkey;
2000                                 break;
2001                         case IB_WR_SEND_WITH_IMM:
2002                                 next->ex.imm_data =
2003                                         (__be32 __force) user_wr->ex.imm_data;
2004                                 break;
2005                         case IB_WR_SEND_WITH_INV:
2006                                 next->ex.invalidate_rkey =
2007                                         user_wr->ex.invalidate_rkey;
2008                                 break;
2009                         case IB_WR_ATOMIC_CMP_AND_SWP:
2010                         case IB_WR_ATOMIC_FETCH_AND_ADD:
2011                                 next->wr.atomic.remote_addr =
2012                                         user_wr->wr.atomic.remote_addr;
2013                                 next->wr.atomic.compare_add =
2014                                         user_wr->wr.atomic.compare_add;
2015                                 next->wr.atomic.swap = user_wr->wr.atomic.swap;
2016                                 next->wr.atomic.rkey = user_wr->wr.atomic.rkey;
2017                                 break;
2018                         default:
2019                                 break;
2020                         }
2021                 }
2022
2023                 if (next->num_sge) {
2024                         next->sg_list = (void *) next +
2025                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
2026                         if (copy_from_user(next->sg_list,
2027                                            buf + sizeof cmd +
2028                                            cmd.wr_count * cmd.wqe_size +
2029                                            sg_ind * sizeof (struct ib_sge),
2030                                            next->num_sge * sizeof (struct ib_sge))) {
2031                                 ret = -EFAULT;
2032                                 goto out_put;
2033                         }
2034                         sg_ind += next->num_sge;
2035                 } else
2036                         next->sg_list = NULL;
2037         }
2038
2039         resp.bad_wr = 0;
2040         ret = qp->device->post_send(qp->real_qp, wr, &bad_wr);
2041         if (ret)
2042                 for (next = wr; next; next = next->next) {
2043                         ++resp.bad_wr;
2044                         if (next == bad_wr)
2045                                 break;
2046                 }
2047
2048         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2049                          &resp, sizeof resp))
2050                 ret = -EFAULT;
2051
2052 out_put:
2053         put_qp_read(qp);
2054
2055         while (wr) {
2056                 if (is_ud && wr->wr.ud.ah)
2057                         put_ah_read(wr->wr.ud.ah);
2058                 next = wr->next;
2059                 kfree(wr);
2060                 wr = next;
2061         }
2062
2063 out:
2064         kfree(user_wr);
2065
2066         return ret ? ret : in_len;
2067 }
2068
2069 static struct ib_recv_wr *ib_uverbs_unmarshall_recv(const char __user *buf,
2070                                                     int in_len,
2071                                                     u32 wr_count,
2072                                                     u32 sge_count,
2073                                                     u32 wqe_size)
2074 {
2075         struct ib_uverbs_recv_wr *user_wr;
2076         struct ib_recv_wr        *wr = NULL, *last, *next;
2077         int                       sg_ind;
2078         int                       i;
2079         int                       ret;
2080
2081         if (in_len < wqe_size * wr_count +
2082             sge_count * sizeof (struct ib_uverbs_sge))
2083                 return ERR_PTR(-EINVAL);
2084
2085         if (wqe_size < sizeof (struct ib_uverbs_recv_wr))
2086                 return ERR_PTR(-EINVAL);
2087
2088         user_wr = kmalloc(wqe_size, GFP_KERNEL);
2089         if (!user_wr)
2090                 return ERR_PTR(-ENOMEM);
2091
2092         sg_ind = 0;
2093         last = NULL;
2094         for (i = 0; i < wr_count; ++i) {
2095                 if (copy_from_user(user_wr, buf + i * wqe_size,
2096                                    wqe_size)) {
2097                         ret = -EFAULT;
2098                         goto err;
2099                 }
2100
2101                 if (user_wr->num_sge + sg_ind > sge_count) {
2102                         ret = -EINVAL;
2103                         goto err;
2104                 }
2105
2106                 next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
2107                                user_wr->num_sge * sizeof (struct ib_sge),
2108                                GFP_KERNEL);
2109                 if (!next) {
2110                         ret = -ENOMEM;
2111                         goto err;
2112                 }
2113
2114                 if (!last)
2115                         wr = next;
2116                 else
2117                         last->next = next;
2118                 last = next;
2119
2120                 next->next       = NULL;
2121                 next->wr_id      = user_wr->wr_id;
2122                 next->num_sge    = user_wr->num_sge;
2123
2124                 if (next->num_sge) {
2125                         next->sg_list = (void *) next +
2126                                 ALIGN(sizeof *next, sizeof (struct ib_sge));
2127                         if (copy_from_user(next->sg_list,
2128                                            buf + wr_count * wqe_size +
2129                                            sg_ind * sizeof (struct ib_sge),
2130                                            next->num_sge * sizeof (struct ib_sge))) {
2131                                 ret = -EFAULT;
2132                                 goto err;
2133                         }
2134                         sg_ind += next->num_sge;
2135                 } else
2136                         next->sg_list = NULL;
2137         }
2138
2139         kfree(user_wr);
2140         return wr;
2141
2142 err:
2143         kfree(user_wr);
2144
2145         while (wr) {
2146                 next = wr->next;
2147                 kfree(wr);
2148                 wr = next;
2149         }
2150
2151         return ERR_PTR(ret);
2152 }
2153
2154 ssize_t ib_uverbs_post_recv(struct ib_uverbs_file *file,
2155                             const char __user *buf, int in_len,
2156                             int out_len)
2157 {
2158         struct ib_uverbs_post_recv      cmd;
2159         struct ib_uverbs_post_recv_resp resp;
2160         struct ib_recv_wr              *wr, *next, *bad_wr;
2161         struct ib_qp                   *qp;
2162         ssize_t                         ret = -EINVAL;
2163
2164         if (copy_from_user(&cmd, buf, sizeof cmd))
2165                 return -EFAULT;
2166
2167         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
2168                                        in_len - sizeof cmd, cmd.wr_count,
2169                                        cmd.sge_count, cmd.wqe_size);
2170         if (IS_ERR(wr))
2171                 return PTR_ERR(wr);
2172
2173         qp = idr_read_qp(cmd.qp_handle, file->ucontext);
2174         if (!qp)
2175                 goto out;
2176
2177         resp.bad_wr = 0;
2178         ret = qp->device->post_recv(qp->real_qp, wr, &bad_wr);
2179
2180         put_qp_read(qp);
2181
2182         if (ret)
2183                 for (next = wr; next; next = next->next) {
2184                         ++resp.bad_wr;
2185                         if (next == bad_wr)
2186                                 break;
2187                 }
2188
2189         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2190                          &resp, sizeof resp))
2191                 ret = -EFAULT;
2192
2193 out:
2194         while (wr) {
2195                 next = wr->next;
2196                 kfree(wr);
2197                 wr = next;
2198         }
2199
2200         return ret ? ret : in_len;
2201 }
2202
2203 ssize_t ib_uverbs_post_srq_recv(struct ib_uverbs_file *file,
2204                                 const char __user *buf, int in_len,
2205                                 int out_len)
2206 {
2207         struct ib_uverbs_post_srq_recv      cmd;
2208         struct ib_uverbs_post_srq_recv_resp resp;
2209         struct ib_recv_wr                  *wr, *next, *bad_wr;
2210         struct ib_srq                      *srq;
2211         ssize_t                             ret = -EINVAL;
2212
2213         if (copy_from_user(&cmd, buf, sizeof cmd))
2214                 return -EFAULT;
2215
2216         wr = ib_uverbs_unmarshall_recv(buf + sizeof cmd,
2217                                        in_len - sizeof cmd, cmd.wr_count,
2218                                        cmd.sge_count, cmd.wqe_size);
2219         if (IS_ERR(wr))
2220                 return PTR_ERR(wr);
2221
2222         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2223         if (!srq)
2224                 goto out;
2225
2226         resp.bad_wr = 0;
2227         ret = srq->device->post_srq_recv(srq, wr, &bad_wr);
2228
2229         put_srq_read(srq);
2230
2231         if (ret)
2232                 for (next = wr; next; next = next->next) {
2233                         ++resp.bad_wr;
2234                         if (next == bad_wr)
2235                                 break;
2236                 }
2237
2238         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2239                          &resp, sizeof resp))
2240                 ret = -EFAULT;
2241
2242 out:
2243         while (wr) {
2244                 next = wr->next;
2245                 kfree(wr);
2246                 wr = next;
2247         }
2248
2249         return ret ? ret : in_len;
2250 }
2251
2252 ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
2253                             const char __user *buf, int in_len,
2254                             int out_len)
2255 {
2256         struct ib_uverbs_create_ah       cmd;
2257         struct ib_uverbs_create_ah_resp  resp;
2258         struct ib_uobject               *uobj;
2259         struct ib_pd                    *pd;
2260         struct ib_ah                    *ah;
2261         struct ib_ah_attr               attr;
2262         int ret;
2263
2264         if (out_len < sizeof resp)
2265                 return -ENOSPC;
2266
2267         if (copy_from_user(&cmd, buf, sizeof cmd))
2268                 return -EFAULT;
2269
2270         uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
2271         if (!uobj)
2272                 return -ENOMEM;
2273
2274         init_uobj(uobj, cmd.user_handle, file->ucontext, &ah_lock_key);
2275         down_write(&uobj->mutex);
2276
2277         pd = idr_read_pd(cmd.pd_handle, file->ucontext);
2278         if (!pd) {
2279                 ret = -EINVAL;
2280                 goto err;
2281         }
2282
2283         attr.dlid              = cmd.attr.dlid;
2284         attr.sl                = cmd.attr.sl;
2285         attr.src_path_bits     = cmd.attr.src_path_bits;
2286         attr.static_rate       = cmd.attr.static_rate;
2287         attr.ah_flags          = cmd.attr.is_global ? IB_AH_GRH : 0;
2288         attr.port_num          = cmd.attr.port_num;
2289         attr.grh.flow_label    = cmd.attr.grh.flow_label;
2290         attr.grh.sgid_index    = cmd.attr.grh.sgid_index;
2291         attr.grh.hop_limit     = cmd.attr.grh.hop_limit;
2292         attr.grh.traffic_class = cmd.attr.grh.traffic_class;
2293         memcpy(attr.grh.dgid.raw, cmd.attr.grh.dgid, 16);
2294
2295         ah = ib_create_ah(pd, &attr);
2296         if (IS_ERR(ah)) {
2297                 ret = PTR_ERR(ah);
2298                 goto err_put;
2299         }
2300
2301         ah->uobject  = uobj;
2302         uobj->object = ah;
2303
2304         ret = idr_add_uobj(&ib_uverbs_ah_idr, uobj);
2305         if (ret)
2306                 goto err_destroy;
2307
2308         resp.ah_handle = uobj->id;
2309
2310         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2311                          &resp, sizeof resp)) {
2312                 ret = -EFAULT;
2313                 goto err_copy;
2314         }
2315
2316         put_pd_read(pd);
2317
2318         mutex_lock(&file->mutex);
2319         list_add_tail(&uobj->list, &file->ucontext->ah_list);
2320         mutex_unlock(&file->mutex);
2321
2322         uobj->live = 1;
2323
2324         up_write(&uobj->mutex);
2325
2326         return in_len;
2327
2328 err_copy:
2329         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
2330
2331 err_destroy:
2332         ib_destroy_ah(ah);
2333
2334 err_put:
2335         put_pd_read(pd);
2336
2337 err:
2338         put_uobj_write(uobj);
2339         return ret;
2340 }
2341
2342 ssize_t ib_uverbs_destroy_ah(struct ib_uverbs_file *file,
2343                              const char __user *buf, int in_len, int out_len)
2344 {
2345         struct ib_uverbs_destroy_ah cmd;
2346         struct ib_ah               *ah;
2347         struct ib_uobject          *uobj;
2348         int                         ret;
2349
2350         if (copy_from_user(&cmd, buf, sizeof cmd))
2351                 return -EFAULT;
2352
2353         uobj = idr_write_uobj(&ib_uverbs_ah_idr, cmd.ah_handle, file->ucontext);
2354         if (!uobj)
2355                 return -EINVAL;
2356         ah = uobj->object;
2357
2358         ret = ib_destroy_ah(ah);
2359         if (!ret)
2360                 uobj->live = 0;
2361
2362         put_uobj_write(uobj);
2363
2364         if (ret)
2365                 return ret;
2366
2367         idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
2368
2369         mutex_lock(&file->mutex);
2370         list_del(&uobj->list);
2371         mutex_unlock(&file->mutex);
2372
2373         put_uobj(uobj);
2374
2375         return in_len;
2376 }
2377
2378 ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
2379                                const char __user *buf, int in_len,
2380                                int out_len)
2381 {
2382         struct ib_uverbs_attach_mcast cmd;
2383         struct ib_qp                 *qp;
2384         struct ib_uqp_object         *obj;
2385         struct ib_uverbs_mcast_entry *mcast;
2386         int                           ret;
2387
2388         if (copy_from_user(&cmd, buf, sizeof cmd))
2389                 return -EFAULT;
2390
2391         qp = idr_write_qp(cmd.qp_handle, file->ucontext);
2392         if (!qp)
2393                 return -EINVAL;
2394
2395         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
2396
2397         list_for_each_entry(mcast, &obj->mcast_list, list)
2398                 if (cmd.mlid == mcast->lid &&
2399                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
2400                         ret = 0;
2401                         goto out_put;
2402                 }
2403
2404         mcast = kmalloc(sizeof *mcast, GFP_KERNEL);
2405         if (!mcast) {
2406                 ret = -ENOMEM;
2407                 goto out_put;
2408         }
2409
2410         mcast->lid = cmd.mlid;
2411         memcpy(mcast->gid.raw, cmd.gid, sizeof mcast->gid.raw);
2412
2413         ret = ib_attach_mcast(qp, &mcast->gid, cmd.mlid);
2414         if (!ret)
2415                 list_add_tail(&mcast->list, &obj->mcast_list);
2416         else
2417                 kfree(mcast);
2418
2419 out_put:
2420         put_qp_write(qp);
2421
2422         return ret ? ret : in_len;
2423 }
2424
2425 ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
2426                                const char __user *buf, int in_len,
2427                                int out_len)
2428 {
2429         struct ib_uverbs_detach_mcast cmd;
2430         struct ib_uqp_object         *obj;
2431         struct ib_qp                 *qp;
2432         struct ib_uverbs_mcast_entry *mcast;
2433         int                           ret = -EINVAL;
2434
2435         if (copy_from_user(&cmd, buf, sizeof cmd))
2436                 return -EFAULT;
2437
2438         qp = idr_write_qp(cmd.qp_handle, file->ucontext);
2439         if (!qp)
2440                 return -EINVAL;
2441
2442         ret = ib_detach_mcast(qp, (union ib_gid *) cmd.gid, cmd.mlid);
2443         if (ret)
2444                 goto out_put;
2445
2446         obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
2447
2448         list_for_each_entry(mcast, &obj->mcast_list, list)
2449                 if (cmd.mlid == mcast->lid &&
2450                     !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
2451                         list_del(&mcast->list);
2452                         kfree(mcast);
2453                         break;
2454                 }
2455
2456 out_put:
2457         put_qp_write(qp);
2458
2459         return ret ? ret : in_len;
2460 }
2461
2462 int __uverbs_create_xsrq(struct ib_uverbs_file *file,
2463                          struct ib_uverbs_create_xsrq *cmd,
2464                          struct ib_udata *udata)
2465 {
2466         struct ib_uverbs_create_srq_resp resp;
2467         struct ib_usrq_object           *obj;
2468         struct ib_pd                    *pd;
2469         struct ib_srq                   *srq;
2470         struct ib_uobject               *uninitialized_var(xrcd_uobj);
2471         struct ib_srq_init_attr          attr;
2472         int ret;
2473
2474         obj = kmalloc(sizeof *obj, GFP_KERNEL);
2475         if (!obj)
2476                 return -ENOMEM;
2477
2478         init_uobj(&obj->uevent.uobject, cmd->user_handle, file->ucontext, &srq_lock_key);
2479         down_write(&obj->uevent.uobject.mutex);
2480
2481         pd  = idr_read_pd(cmd->pd_handle, file->ucontext);
2482         if (!pd) {
2483                 ret = -EINVAL;
2484                 goto err;
2485         }
2486
2487         if (cmd->srq_type == IB_SRQT_XRC) {
2488                 attr.ext.xrc.cq  = idr_read_cq(cmd->cq_handle, file->ucontext, 0);
2489                 if (!attr.ext.xrc.cq) {
2490                         ret = -EINVAL;
2491                         goto err_put_pd;
2492                 }
2493
2494                 attr.ext.xrc.xrcd  = idr_read_xrcd(cmd->xrcd_handle, file->ucontext, &xrcd_uobj);
2495                 if (!attr.ext.xrc.xrcd) {
2496                         ret = -EINVAL;
2497                         goto err_put_cq;
2498                 }
2499
2500                 obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, uobject);
2501                 atomic_inc(&obj->uxrcd->refcnt);
2502         }
2503
2504         attr.event_handler  = ib_uverbs_srq_event_handler;
2505         attr.srq_context    = file;
2506         attr.srq_type       = cmd->srq_type;
2507         attr.attr.max_wr    = cmd->max_wr;
2508         attr.attr.max_sge   = cmd->max_sge;
2509         attr.attr.srq_limit = cmd->srq_limit;
2510
2511         obj->uevent.events_reported = 0;
2512         INIT_LIST_HEAD(&obj->uevent.event_list);
2513
2514         srq = pd->device->create_srq(pd, &attr, udata);
2515         if (IS_ERR(srq)) {
2516                 ret = PTR_ERR(srq);
2517                 goto err_put;
2518         }
2519
2520         srq->device        = pd->device;
2521         srq->pd            = pd;
2522         srq->srq_type      = cmd->srq_type;
2523         srq->uobject       = &obj->uevent.uobject;
2524         srq->event_handler = attr.event_handler;
2525         srq->srq_context   = attr.srq_context;
2526
2527         if (cmd->srq_type == IB_SRQT_XRC) {
2528                 srq->ext.xrc.cq   = attr.ext.xrc.cq;
2529                 srq->ext.xrc.xrcd = attr.ext.xrc.xrcd;
2530                 atomic_inc(&attr.ext.xrc.cq->usecnt);
2531                 atomic_inc(&attr.ext.xrc.xrcd->usecnt);
2532         }
2533
2534         atomic_inc(&pd->usecnt);
2535         atomic_set(&srq->usecnt, 0);
2536
2537         obj->uevent.uobject.object = srq;
2538         ret = idr_add_uobj(&ib_uverbs_srq_idr, &obj->uevent.uobject);
2539         if (ret)
2540                 goto err_destroy;
2541
2542         memset(&resp, 0, sizeof resp);
2543         resp.srq_handle = obj->uevent.uobject.id;
2544         resp.max_wr     = attr.attr.max_wr;
2545         resp.max_sge    = attr.attr.max_sge;
2546         if (cmd->srq_type == IB_SRQT_XRC)
2547                 resp.srqn = srq->ext.xrc.srq_num;
2548
2549         if (copy_to_user((void __user *) (unsigned long) cmd->response,
2550                          &resp, sizeof resp)) {
2551                 ret = -EFAULT;
2552                 goto err_copy;
2553         }
2554
2555         if (cmd->srq_type == IB_SRQT_XRC) {
2556                 put_uobj_read(xrcd_uobj);
2557                 put_cq_read(attr.ext.xrc.cq);
2558         }
2559         put_pd_read(pd);
2560
2561         mutex_lock(&file->mutex);
2562         list_add_tail(&obj->uevent.uobject.list, &file->ucontext->srq_list);
2563         mutex_unlock(&file->mutex);
2564
2565         obj->uevent.uobject.live = 1;
2566
2567         up_write(&obj->uevent.uobject.mutex);
2568
2569         return 0;
2570
2571 err_copy:
2572         idr_remove_uobj(&ib_uverbs_srq_idr, &obj->uevent.uobject);
2573
2574 err_destroy:
2575         ib_destroy_srq(srq);
2576
2577 err_put:
2578         if (cmd->srq_type == IB_SRQT_XRC) {
2579                 atomic_dec(&obj->uxrcd->refcnt);
2580                 put_uobj_read(xrcd_uobj);
2581         }
2582
2583 err_put_cq:
2584         if (cmd->srq_type == IB_SRQT_XRC)
2585                 put_cq_read(attr.ext.xrc.cq);
2586
2587 err_put_pd:
2588         put_pd_read(pd);
2589
2590 err:
2591         put_uobj_write(&obj->uevent.uobject);
2592         return ret;
2593 }
2594
2595 ssize_t ib_uverbs_create_srq(struct ib_uverbs_file *file,
2596                              const char __user *buf, int in_len,
2597                              int out_len)
2598 {
2599         struct ib_uverbs_create_srq      cmd;
2600         struct ib_uverbs_create_xsrq     xcmd;
2601         struct ib_uverbs_create_srq_resp resp;
2602         struct ib_udata                  udata;
2603         int ret;
2604
2605         if (out_len < sizeof resp)
2606                 return -ENOSPC;
2607
2608         if (copy_from_user(&cmd, buf, sizeof cmd))
2609                 return -EFAULT;
2610
2611         xcmd.response    = cmd.response;
2612         xcmd.user_handle = cmd.user_handle;
2613         xcmd.srq_type    = IB_SRQT_BASIC;
2614         xcmd.pd_handle   = cmd.pd_handle;
2615         xcmd.max_wr      = cmd.max_wr;
2616         xcmd.max_sge     = cmd.max_sge;
2617         xcmd.srq_limit   = cmd.srq_limit;
2618
2619         INIT_UDATA(&udata, buf + sizeof cmd,
2620                    (unsigned long) cmd.response + sizeof resp,
2621                    in_len - sizeof cmd, out_len - sizeof resp);
2622
2623         ret = __uverbs_create_xsrq(file, &xcmd, &udata);
2624         if (ret)
2625                 return ret;
2626
2627         return in_len;
2628 }
2629
2630 ssize_t ib_uverbs_create_xsrq(struct ib_uverbs_file *file,
2631                               const char __user *buf, int in_len, int out_len)
2632 {
2633         struct ib_uverbs_create_xsrq     cmd;
2634         struct ib_uverbs_create_srq_resp resp;
2635         struct ib_udata                  udata;
2636         int ret;
2637
2638         if (out_len < sizeof resp)
2639                 return -ENOSPC;
2640
2641         if (copy_from_user(&cmd, buf, sizeof cmd))
2642                 return -EFAULT;
2643
2644         INIT_UDATA(&udata, buf + sizeof cmd,
2645                    (unsigned long) cmd.response + sizeof resp,
2646                    in_len - sizeof cmd, out_len - sizeof resp);
2647
2648         ret = __uverbs_create_xsrq(file, &cmd, &udata);
2649         if (ret)
2650                 return ret;
2651
2652         return in_len;
2653 }
2654
2655 ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
2656                              const char __user *buf, int in_len,
2657                              int out_len)
2658 {
2659         struct ib_uverbs_modify_srq cmd;
2660         struct ib_udata             udata;
2661         struct ib_srq              *srq;
2662         struct ib_srq_attr          attr;
2663         int                         ret;
2664
2665         if (copy_from_user(&cmd, buf, sizeof cmd))
2666                 return -EFAULT;
2667
2668         INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
2669                    out_len);
2670
2671         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2672         if (!srq)
2673                 return -EINVAL;
2674
2675         attr.max_wr    = cmd.max_wr;
2676         attr.srq_limit = cmd.srq_limit;
2677
2678         ret = srq->device->modify_srq(srq, &attr, cmd.attr_mask, &udata);
2679
2680         put_srq_read(srq);
2681
2682         return ret ? ret : in_len;
2683 }
2684
2685 ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
2686                             const char __user *buf,
2687                             int in_len, int out_len)
2688 {
2689         struct ib_uverbs_query_srq      cmd;
2690         struct ib_uverbs_query_srq_resp resp;
2691         struct ib_srq_attr              attr;
2692         struct ib_srq                   *srq;
2693         int                             ret;
2694
2695         if (out_len < sizeof resp)
2696                 return -ENOSPC;
2697
2698         if (copy_from_user(&cmd, buf, sizeof cmd))
2699                 return -EFAULT;
2700
2701         srq = idr_read_srq(cmd.srq_handle, file->ucontext);
2702         if (!srq)
2703                 return -EINVAL;
2704
2705         ret = ib_query_srq(srq, &attr);
2706
2707         put_srq_read(srq);
2708
2709         if (ret)
2710                 return ret;
2711
2712         memset(&resp, 0, sizeof resp);
2713
2714         resp.max_wr    = attr.max_wr;
2715         resp.max_sge   = attr.max_sge;
2716         resp.srq_limit = attr.srq_limit;
2717
2718         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2719                          &resp, sizeof resp))
2720                 return -EFAULT;
2721
2722         return in_len;
2723 }
2724
2725 ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
2726                               const char __user *buf, int in_len,
2727                               int out_len)
2728 {
2729         struct ib_uverbs_destroy_srq      cmd;
2730         struct ib_uverbs_destroy_srq_resp resp;
2731         struct ib_uobject                *uobj;
2732         struct ib_srq                    *srq;
2733         struct ib_uevent_object          *obj;
2734         int                               ret = -EINVAL;
2735
2736         if (copy_from_user(&cmd, buf, sizeof cmd))
2737                 return -EFAULT;
2738
2739         uobj = idr_write_uobj(&ib_uverbs_srq_idr, cmd.srq_handle, file->ucontext);
2740         if (!uobj)
2741                 return -EINVAL;
2742         srq = uobj->object;
2743         obj = container_of(uobj, struct ib_uevent_object, uobject);
2744
2745         ret = ib_destroy_srq(srq);
2746         if (!ret)
2747                 uobj->live = 0;
2748
2749         put_uobj_write(uobj);
2750
2751         if (ret)
2752                 return ret;
2753
2754         idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
2755
2756         mutex_lock(&file->mutex);
2757         list_del(&uobj->list);
2758         mutex_unlock(&file->mutex);
2759
2760         ib_uverbs_release_uevent(file, obj);
2761
2762         memset(&resp, 0, sizeof resp);
2763         resp.events_reported = obj->events_reported;
2764
2765         put_uobj(uobj);
2766
2767         if (copy_to_user((void __user *) (unsigned long) cmd.response,
2768                          &resp, sizeof resp))
2769                 ret = -EFAULT;
2770
2771         return ret ? ret : in_len;
2772 }