drivers/infiniband/hw/ehca/ehca_qp.c

   1 /*
   2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3  *
   4  *  QP functions
   5  *
   6  *  Authors: Waleri Fomin <fomin@de.ibm.com>
   7  *           Hoang-Nam Nguyen <hnguyen@de.ibm.com>
   8  *           Reinhard Ernst <rernst@de.ibm.com>
   9  *           Heiko J Schick <schickhj@de.ibm.com>
  10  *
  11  *  Copyright (c) 2005 IBM Corporation
  12  *
  13  *  All rights reserved.
  14  *
  15  *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
  16  *  BSD.
  17  *
  18  * OpenIB BSD License
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions are met:
  22  *
  23  * Redistributions of source code must retain the above copyright notice, this
  24  * list of conditions and the following disclaimer.
  25  *
  26  * Redistributions in binary form must reproduce the above copyright notice,
  27  * this list of conditions and the following disclaimer in the documentation
  28  * and/or other materials
  29  * provided with the distribution.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  32  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  34  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  35  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  36  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  37  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  38  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  39  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGE.
  42  */
  43
  44
  45 #include <asm/current.h>
  46
  47 #include "ehca_classes.h"
  48 #include "ehca_tools.h"
  49 #include "ehca_qes.h"
  50 #include "ehca_iverbs.h"
  51 #include "hcp_if.h"
  52 #include "hipz_fns.h"
  53
  54 static struct kmem_cache *qp_cache;
  55
  56 /*
  57  * attributes not supported by query qp
  58  */
  59 #define QP_ATTR_QUERY_NOT_SUPPORTED (IB_QP_MAX_DEST_RD_ATOMIC | \
  60                                      IB_QP_MAX_QP_RD_ATOMIC   | \
  61                                      IB_QP_ACCESS_FLAGS       | \
  62                                      IB_QP_EN_SQD_ASYNC_NOTIFY)
  63
  64 /*
  65  * ehca (internal) qp state values
  66  */
  67 enum ehca_qp_state {
  68         EHCA_QPS_RESET = 1,
  69         EHCA_QPS_INIT = 2,
  70         EHCA_QPS_RTR = 3,
  71         EHCA_QPS_RTS = 5,
  72         EHCA_QPS_SQD = 6,
  73         EHCA_QPS_SQE = 8,
  74         EHCA_QPS_ERR = 128
  75 };
  76
  77 /*
  78  * qp state transitions as defined by IB Arch Rel 1.1 page 431
  79  */
  80 enum ib_qp_statetrans {
  81         IB_QPST_ANY2RESET,
  82         IB_QPST_ANY2ERR,
  83         IB_QPST_RESET2INIT,
  84         IB_QPST_INIT2RTR,
  85         IB_QPST_INIT2INIT,
  86         IB_QPST_RTR2RTS,
  87         IB_QPST_RTS2SQD,
  88         IB_QPST_RTS2RTS,
  89         IB_QPST_SQD2RTS,
  90         IB_QPST_SQE2RTS,
  91         IB_QPST_SQD2SQD,
  92         IB_QPST_MAX     /* nr of transitions, this must be last!!! */
  93 };
  94
  95 /*
  96  * ib2ehca_qp_state maps IB to ehca qp_state
  97  * returns ehca qp state corresponding to given ib qp state
  98  */
  99 static inline enum ehca_qp_state ib2ehca_qp_state(enum ib_qp_state ib_qp_state)
 100 {
 101         switch (ib_qp_state) {
 102         case IB_QPS_RESET:
 103                 return EHCA_QPS_RESET;
 104         case IB_QPS_INIT:
 105                 return EHCA_QPS_INIT;
 106         case IB_QPS_RTR:
 107                 return EHCA_QPS_RTR;
 108         case IB_QPS_RTS:
 109                 return EHCA_QPS_RTS;
 110         case IB_QPS_SQD:
 111                 return EHCA_QPS_SQD;
 112         case IB_QPS_SQE:
 113                 return EHCA_QPS_SQE;
 114         case IB_QPS_ERR:
 115                 return EHCA_QPS_ERR;
 116         default:
 117                 ehca_gen_err("invalid ib_qp_state=%x", ib_qp_state);
 118                 return -EINVAL;
 119         }
 120 }
 121
 122 /*
 123  * ehca2ib_qp_state maps ehca to IB qp_state
 124  * returns ib qp state corresponding to given ehca qp state
 125  */
 126 static inline enum ib_qp_state ehca2ib_qp_state(enum ehca_qp_state
 127                                                 ehca_qp_state)
 128 {
 129         switch (ehca_qp_state) {
 130         case EHCA_QPS_RESET:
 131                 return IB_QPS_RESET;
 132         case EHCA_QPS_INIT:
 133                 return IB_QPS_INIT;
 134         case EHCA_QPS_RTR:
 135                 return IB_QPS_RTR;
 136         case EHCA_QPS_RTS:
 137                 return IB_QPS_RTS;
 138         case EHCA_QPS_SQD:
 139                 return IB_QPS_SQD;
 140         case EHCA_QPS_SQE:
 141                 return IB_QPS_SQE;
 142         case EHCA_QPS_ERR:
 143                 return IB_QPS_ERR;
 144         default:
 145                 ehca_gen_err("invalid ehca_qp_state=%x", ehca_qp_state);
 146                 return -EINVAL;
 147         }
 148 }
 149
 150 /*
 151  * ehca_qp_type used as index for req_attr and opt_attr of
 152  * struct ehca_modqp_statetrans
 153  */
 154 enum ehca_qp_type {
 155         QPT_RC = 0,
 156         QPT_UC = 1,
 157         QPT_UD = 2,
 158         QPT_SQP = 3,
 159         QPT_MAX
 160 };
 161
 162 /*
 163  * ib2ehcaqptype maps Ib to ehca qp_type
 164  * returns ehca qp type corresponding to ib qp type
 165  */
 166 static inline enum ehca_qp_type ib2ehcaqptype(enum ib_qp_type ibqptype)
 167 {
 168         switch (ibqptype) {
 169         case IB_QPT_SMI:
 170         case IB_QPT_GSI:
 171                 return QPT_SQP;
 172         case IB_QPT_RC:
 173                 return QPT_RC;
 174         case IB_QPT_UC:
 175                 return QPT_UC;
 176         case IB_QPT_UD:
 177                 return QPT_UD;
 178         default:
 179                 ehca_gen_err("Invalid ibqptype=%x", ibqptype);
 180                 return -EINVAL;
 181         }
 182 }
 183
 184 static inline enum ib_qp_statetrans get_modqp_statetrans(int ib_fromstate,
 185                                                          int ib_tostate)
 186 {
 187         int index = -EINVAL;
 188         switch (ib_tostate) {
 189         case IB_QPS_RESET:
 190                 index = IB_QPST_ANY2RESET;
 191                 break;
 192         case IB_QPS_INIT:
 193                 switch (ib_fromstate) {
 194                 case IB_QPS_RESET:
 195                         index = IB_QPST_RESET2INIT;
 196                         break;
 197                 case IB_QPS_INIT:
 198                         index = IB_QPST_INIT2INIT;
 199                         break;
 200                 }
 201                 break;
 202         case IB_QPS_RTR:
 203                 if (ib_fromstate == IB_QPS_INIT)
 204                         index = IB_QPST_INIT2RTR;
 205                 break;
 206         case IB_QPS_RTS:
 207                 switch (ib_fromstate) {
 208                 case IB_QPS_RTR:
 209                         index = IB_QPST_RTR2RTS;
 210                         break;
 211                 case IB_QPS_RTS:
 212                         index = IB_QPST_RTS2RTS;
 213                         break;
 214                 case IB_QPS_SQD:
 215                         index = IB_QPST_SQD2RTS;
 216                         break;
 217                 case IB_QPS_SQE:
 218                         index = IB_QPST_SQE2RTS;
 219                         break;
 220                 }
 221                 break;
 222         case IB_QPS_SQD:
 223                 if (ib_fromstate == IB_QPS_RTS)
 224                         index = IB_QPST_RTS2SQD;
 225                 break;
 226         case IB_QPS_SQE:
 227                 break;
 228         case IB_QPS_ERR:
 229                 index = IB_QPST_ANY2ERR;
 230                 break;
 231         default:
 232                 break;
 233         }
 234         return index;
 235 }
 236
 237 enum ehca_service_type {
 238         ST_RC = 0,
 239         ST_UC = 1,
 240         ST_RD = 2,
 241         ST_UD = 3
 242 };
 243
 244 /*
 245  * ibqptype2servicetype returns hcp service type corresponding to given
 246  * ib qp type used by create_qp()
 247  */
 248 static inline int ibqptype2servicetype(enum ib_qp_type ibqptype)
 249 {
 250         switch (ibqptype) {
 251         case IB_QPT_SMI:
 252         case IB_QPT_GSI:
 253                 return ST_UD;
 254         case IB_QPT_RC:
 255                 return ST_RC;
 256         case IB_QPT_UC:
 257                 return ST_UC;
 258         case IB_QPT_UD:
 259                 return ST_UD;
 260         case IB_QPT_RAW_IPV6:
 261                 return -EINVAL;
 262         case IB_QPT_RAW_ETY:
 263                 return -EINVAL;
 264         default:
 265                 ehca_gen_err("Invalid ibqptype=%x", ibqptype);
 266                 return -EINVAL;
 267         }
 268 }
 269
 270 /*
 271  * init_qp_queues initializes/constructs r/squeue and registers queue pages.
 272  */
 273 static inline int init_qp_queues(struct ehca_shca *shca,
 274                                  struct ehca_qp *my_qp,
 275                                  int nr_sq_pages,
 276                                  int nr_rq_pages,
 277                                  int swqe_size,
 278                                  int rwqe_size,
 279                                  int nr_send_sges, int nr_receive_sges)
 280 {
 281         int ret, cnt, ipz_rc;
 282         void *vpage;
 283         u64 rpage, h_ret;
 284         struct ib_device *ib_dev = &shca->ib_device;
 285         struct ipz_adapter_handle ipz_hca_handle = shca->ipz_hca_handle;
 286
 287         ipz_rc = ipz_queue_ctor(&my_qp->ipz_squeue,
 288                                 nr_sq_pages,
 289                                 EHCA_PAGESIZE, swqe_size, nr_send_sges);
 290         if (!ipz_rc) {
 291                 ehca_err(ib_dev,"Cannot allocate page for squeue. ipz_rc=%x",
 292                          ipz_rc);
 293                 return -EBUSY;
 294         }
 295
 296         ipz_rc = ipz_queue_ctor(&my_qp->ipz_rqueue,
 297                                 nr_rq_pages,
 298                                 EHCA_PAGESIZE, rwqe_size, nr_receive_sges);
 299         if (!ipz_rc) {
 300                 ehca_err(ib_dev, "Cannot allocate page for rqueue. ipz_rc=%x",
 301                          ipz_rc);
 302                 ret = -EBUSY;
 303                 goto init_qp_queues0;
 304         }
 305         /* register SQ pages */
 306         for (cnt = 0; cnt < nr_sq_pages; cnt++) {
 307                 vpage = ipz_qpageit_get_inc(&my_qp->ipz_squeue);
 308                 if (!vpage) {
 309                         ehca_err(ib_dev, "SQ ipz_qpageit_get_inc() "
 310                                  "failed p_vpage= %p", vpage);
 311                         ret = -EINVAL;
 312                         goto init_qp_queues1;
 313                 }
 314                 rpage = virt_to_abs(vpage);
 315
 316                 h_ret = hipz_h_register_rpage_qp(ipz_hca_handle,
 317                                                  my_qp->ipz_qp_handle,
 318                                                  &my_qp->pf, 0, 0,
 319                                                  rpage, 1,
 320                                                  my_qp->galpas.kernel);
 321                 if (h_ret < H_SUCCESS) {
 322                         ehca_err(ib_dev, "SQ hipz_qp_register_rpage()"
 323                                  " failed rc=%lx", h_ret);
 324                         ret = ehca2ib_return_code(h_ret);
 325                         goto init_qp_queues1;
 326                 }
 327         }
 328
 329         ipz_qeit_reset(&my_qp->ipz_squeue);
 330
 331         /* register RQ pages */
 332         for (cnt = 0; cnt < nr_rq_pages; cnt++) {
 333                 vpage = ipz_qpageit_get_inc(&my_qp->ipz_rqueue);
 334                 if (!vpage) {
 335                         ehca_err(ib_dev, "RQ ipz_qpageit_get_inc() "
 336                                  "failed p_vpage = %p", vpage);
 337                         ret = -EINVAL;
 338                         goto init_qp_queues1;
 339                 }
 340
 341                 rpage = virt_to_abs(vpage);
 342
 343                 h_ret = hipz_h_register_rpage_qp(ipz_hca_handle,
 344                                                  my_qp->ipz_qp_handle,
 345                                                  &my_qp->pf, 0, 1,
 346                                                  rpage, 1,my_qp->galpas.kernel);
 347                 if (h_ret < H_SUCCESS) {
 348                         ehca_err(ib_dev, "RQ hipz_qp_register_rpage() failed "
 349                                  "rc=%lx", h_ret);
 350                         ret = ehca2ib_return_code(h_ret);
 351                         goto init_qp_queues1;
 352                 }
 353                 if (cnt == (nr_rq_pages - 1)) { /* last page! */
 354                         if (h_ret != H_SUCCESS) {
 355                                 ehca_err(ib_dev, "RQ hipz_qp_register_rpage() "
 356                                          "h_ret= %lx ", h_ret);
 357                                 ret = ehca2ib_return_code(h_ret);
 358                                 goto init_qp_queues1;
 359                         }
 360                         vpage = ipz_qpageit_get_inc(&my_qp->ipz_rqueue);
 361                         if (vpage) {
 362                                 ehca_err(ib_dev, "ipz_qpageit_get_inc() "
 363                                          "should not succeed vpage=%p", vpage);
 364                                 ret = -EINVAL;
 365                                 goto init_qp_queues1;
 366                         }
 367                 } else {
 368                         if (h_ret != H_PAGE_REGISTERED) {
 369                                 ehca_err(ib_dev, "RQ hipz_qp_register_rpage() "
 370                                          "h_ret= %lx ", h_ret);
 371                                 ret = ehca2ib_return_code(h_ret);
 372                                 goto init_qp_queues1;
 373                         }
 374                 }
 375         }
 376
 377         ipz_qeit_reset(&my_qp->ipz_rqueue);
 378
 379         return 0;
 380
 381 init_qp_queues1:
 382         ipz_queue_dtor(&my_qp->ipz_rqueue);
 383 init_qp_queues0:
 384         ipz_queue_dtor(&my_qp->ipz_squeue);
 385         return ret;
 386 }
 387
 388 struct ib_qp *ehca_create_qp(struct ib_pd *pd,
 389                              struct ib_qp_init_attr *init_attr,
 390                              struct ib_udata *udata)
 391 {
 392         static int da_rc_msg_size[]={ 128, 256, 512, 1024, 2048, 4096 };
 393         static int da_ud_sq_msg_size[]={ 128, 384, 896, 1920, 3968 };
 394         struct ehca_qp *my_qp;
 395         struct ehca_pd *my_pd = container_of(pd, struct ehca_pd, ib_pd);
 396         struct ehca_shca *shca = container_of(pd->device, struct ehca_shca,
 397                                               ib_device);
 398         struct ib_ucontext *context = NULL;
 399         u64 h_ret;
 400         int max_send_sge, max_recv_sge, ret;
 401
 402         /* h_call's out parameters */
 403         struct ehca_alloc_qp_parms parms;
 404         u32 swqe_size = 0, rwqe_size = 0;
 405         u8 daqp_completion, isdaqp;
 406         unsigned long flags;
 407
 408         if (init_attr->sq_sig_type != IB_SIGNAL_REQ_WR &&
 409                 init_attr->sq_sig_type != IB_SIGNAL_ALL_WR) {
 410                 ehca_err(pd->device, "init_attr->sg_sig_type=%x not allowed",
 411                          init_attr->sq_sig_type);
 412                 return ERR_PTR(-EINVAL);
 413         }
 414
 415         /* save daqp completion bits */
 416         daqp_completion = init_attr->qp_type & 0x60;
 417         /* save daqp bit */
 418         isdaqp = (init_attr->qp_type & 0x80) ? 1 : 0;
 419         init_attr->qp_type = init_attr->qp_type & 0x1F;
 420
 421         if (init_attr->qp_type != IB_QPT_UD &&
 422             init_attr->qp_type != IB_QPT_SMI &&
 423             init_attr->qp_type != IB_QPT_GSI &&
 424             init_attr->qp_type != IB_QPT_UC &&
 425             init_attr->qp_type != IB_QPT_RC) {
 426                 ehca_err(pd->device, "wrong QP Type=%x", init_attr->qp_type);
 427                 return ERR_PTR(-EINVAL);
 428         }
 429         if ((init_attr->qp_type != IB_QPT_RC && init_attr->qp_type != IB_QPT_UD)
 430             && isdaqp) {
 431                 ehca_err(pd->device, "unsupported LL QP Type=%x",
 432                          init_attr->qp_type);
 433                 return ERR_PTR(-EINVAL);
 434         } else if (init_attr->qp_type == IB_QPT_RC && isdaqp &&
 435                    (init_attr->cap.max_send_wr > 255 ||
 436                     init_attr->cap.max_recv_wr > 255 )) {
 437                        ehca_err(pd->device, "Invalid Number of max_sq_wr =%x "
 438                                 "or max_rq_wr=%x for QP Type=%x",
 439                                 init_attr->cap.max_send_wr,
 440                                 init_attr->cap.max_recv_wr,init_attr->qp_type);
 441                        return ERR_PTR(-EINVAL);
 442         } else if (init_attr->qp_type == IB_QPT_UD && isdaqp &&
 443                   init_attr->cap.max_send_wr > 255) {
 444                 ehca_err(pd->device,
 445                          "Invalid Number of max_send_wr=%x for UD QP_TYPE=%x",
 446                          init_attr->cap.max_send_wr, init_attr->qp_type);
 447                 return ERR_PTR(-EINVAL);
 448         }
 449
 450         if (pd->uobject && udata)
 451                 context = pd->uobject->context;
 452
 453         my_qp = kmem_cache_alloc(qp_cache, SLAB_KERNEL);
 454         if (!my_qp) {
 455                 ehca_err(pd->device, "pd=%p not enough memory to alloc qp", pd);
 456                 return ERR_PTR(-ENOMEM);
 457         }
 458
 459         memset(my_qp, 0, sizeof(struct ehca_qp));
 460         memset (&parms, 0, sizeof(struct ehca_alloc_qp_parms));
 461         spin_lock_init(&my_qp->spinlock_s);
 462         spin_lock_init(&my_qp->spinlock_r);
 463
 464         my_qp->recv_cq =
 465                 container_of(init_attr->recv_cq, struct ehca_cq, ib_cq);
 466         my_qp->send_cq =
 467                 container_of(init_attr->send_cq, struct ehca_cq, ib_cq);
 468
 469         my_qp->init_attr = *init_attr;
 470
 471         do {
 472                 if (!idr_pre_get(&ehca_qp_idr, GFP_KERNEL)) {
 473                         ret = -ENOMEM;
 474                         ehca_err(pd->device, "Can't reserve idr resources.");
 475                         goto create_qp_exit0;
 476                 }
 477
 478                 spin_lock_irqsave(&ehca_qp_idr_lock, flags);
 479                 ret = idr_get_new(&ehca_qp_idr, my_qp, &my_qp->token);
 480                 spin_unlock_irqrestore(&ehca_qp_idr_lock, flags);
 481
 482         } while (ret == -EAGAIN);
 483
 484         if (ret) {
 485                 ret = -ENOMEM;
 486                 ehca_err(pd->device, "Can't allocate new idr entry.");
 487                 goto create_qp_exit0;
 488         }
 489
 490         parms.servicetype = ibqptype2servicetype(init_attr->qp_type);
 491         if (parms.servicetype < 0) {
 492                 ret = -EINVAL;
 493                 ehca_err(pd->device, "Invalid qp_type=%x", init_attr->qp_type);
 494                 goto create_qp_exit0;
 495         }
 496
 497         if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
 498                 parms.sigtype = HCALL_SIGT_EVERY;
 499         else
 500                 parms.sigtype = HCALL_SIGT_BY_WQE;
 501
 502         /* UD_AV CIRCUMVENTION */
 503         max_send_sge = init_attr->cap.max_send_sge;
 504         max_recv_sge = init_attr->cap.max_recv_sge;
 505         if (IB_QPT_UD == init_attr->qp_type ||
 506             IB_QPT_GSI == init_attr->qp_type ||
 507             IB_QPT_SMI == init_attr->qp_type) {
 508                 max_send_sge += 2;
 509                 max_recv_sge += 2;
 510         }
 511
 512         parms.ipz_eq_handle = shca->eq.ipz_eq_handle;
 513         parms.daqp_ctrl = isdaqp | daqp_completion;
 514         parms.pd = my_pd->fw_pd;
 515         parms.max_recv_sge = max_recv_sge;
 516         parms.max_send_sge = max_send_sge;
 517
 518         h_ret = hipz_h_alloc_resource_qp(shca->ipz_hca_handle, my_qp, &parms);
 519
 520         if (h_ret != H_SUCCESS) {
 521                 ehca_err(pd->device, "h_alloc_resource_qp() failed h_ret=%lx",
 522                          h_ret);
 523                 ret = ehca2ib_return_code(h_ret);
 524                 goto create_qp_exit1;
 525         }
 526
 527         switch (init_attr->qp_type) {
 528         case IB_QPT_RC:
 529                 if (isdaqp == 0) {
 530                         swqe_size = offsetof(struct ehca_wqe, u.nud.sg_list[
 531                                              (parms.act_nr_send_sges)]);
 532                         rwqe_size = offsetof(struct ehca_wqe, u.nud.sg_list[
 533                                              (parms.act_nr_recv_sges)]);
 534                 } else { /* for daqp we need to use msg size, not wqe size */
 535                         swqe_size = da_rc_msg_size[max_send_sge];
 536                         rwqe_size = da_rc_msg_size[max_recv_sge];
 537                         parms.act_nr_send_sges = 1;
 538                         parms.act_nr_recv_sges = 1;
 539                 }
 540                 break;
 541         case IB_QPT_UC:
 542                 swqe_size = offsetof(struct ehca_wqe,
 543                                      u.nud.sg_list[parms.act_nr_send_sges]);
 544                 rwqe_size = offsetof(struct ehca_wqe,
 545                                      u.nud.sg_list[parms.act_nr_recv_sges]);
 546                 break;
 547
 548         case IB_QPT_UD:
 549         case IB_QPT_GSI:
 550         case IB_QPT_SMI:
 551                 /* UD circumvention */
 552                 parms.act_nr_recv_sges -= 2;
 553                 parms.act_nr_send_sges -= 2;
 554                 if (isdaqp) {
 555                         swqe_size = da_ud_sq_msg_size[max_send_sge];
 556                         rwqe_size = da_rc_msg_size[max_recv_sge];
 557                         parms.act_nr_send_sges = 1;
 558                         parms.act_nr_recv_sges = 1;
 559                 } else {
 560                         swqe_size = offsetof(struct ehca_wqe,
 561                                              u.ud_av.sg_list[parms.act_nr_send_sges]);
 562                         rwqe_size = offsetof(struct ehca_wqe,
 563                                              u.ud_av.sg_list[parms.act_nr_recv_sges]);
 564                 }
 565
 566                 if (IB_QPT_GSI == init_attr->qp_type ||
 567                     IB_QPT_SMI == init_attr->qp_type) {
 568                         parms.act_nr_send_wqes = init_attr->cap.max_send_wr;
 569                         parms.act_nr_recv_wqes = init_attr->cap.max_recv_wr;
 570                         parms.act_nr_send_sges = init_attr->cap.max_send_sge;
 571                         parms.act_nr_recv_sges = init_attr->cap.max_recv_sge;
 572                         my_qp->real_qp_num =
 573                                 (init_attr->qp_type == IB_QPT_SMI) ? 0 : 1;
 574                 }
 575
 576                 break;
 577
 578         default:
 579                 break;
 580         }
 581
 582         /* initializes r/squeue and registers queue pages */
 583         ret = init_qp_queues(shca, my_qp,
 584                              parms.nr_sq_pages, parms.nr_rq_pages,
 585                              swqe_size, rwqe_size,
 586                              parms.act_nr_send_sges, parms.act_nr_recv_sges);
 587         if (ret) {
 588                 ehca_err(pd->device,
 589                          "Couldn't initialize r/squeue and pages ret=%x", ret);
 590                 goto create_qp_exit2;
 591         }
 592
 593         my_qp->ib_qp.pd = &my_pd->ib_pd;
 594         my_qp->ib_qp.device = my_pd->ib_pd.device;
 595
 596         my_qp->ib_qp.recv_cq = init_attr->recv_cq;
 597         my_qp->ib_qp.send_cq = init_attr->send_cq;
 598
 599         my_qp->ib_qp.qp_num = my_qp->real_qp_num;
 600         my_qp->ib_qp.qp_type = init_attr->qp_type;
 601
 602         my_qp->qp_type = init_attr->qp_type;
 603         my_qp->ib_qp.srq = init_attr->srq;
 604
 605         my_qp->ib_qp.qp_context = init_attr->qp_context;
 606         my_qp->ib_qp.event_handler = init_attr->event_handler;
 607
 608         init_attr->cap.max_inline_data = 0; /* not supported yet */
 609         init_attr->cap.max_recv_sge = parms.act_nr_recv_sges;
 610         init_attr->cap.max_recv_wr = parms.act_nr_recv_wqes;
 611         init_attr->cap.max_send_sge = parms.act_nr_send_sges;
 612         init_attr->cap.max_send_wr = parms.act_nr_send_wqes;
 613
 614         /* NOTE: define_apq0() not supported yet */
 615         if (init_attr->qp_type == IB_QPT_GSI) {
 616                 h_ret = ehca_define_sqp(shca, my_qp, init_attr);
 617                 if (h_ret != H_SUCCESS) {
 618                         ehca_err(pd->device, "ehca_define_sqp() failed rc=%lx",
 619                                  h_ret);
 620                         ret = ehca2ib_return_code(h_ret);
 621                         goto create_qp_exit3;
 622                 }
 623         }
 624         if (init_attr->send_cq) {
 625                 struct ehca_cq *cq = container_of(init_attr->send_cq,
 626                                                   struct ehca_cq, ib_cq);
 627                 ret = ehca_cq_assign_qp(cq, my_qp);
 628                 if (ret) {
 629                         ehca_err(pd->device, "Couldn't assign qp to send_cq ret=%x",
 630                                  ret);
 631                         goto create_qp_exit3;
 632                 }
 633                 my_qp->send_cq = cq;
 634         }
 635         /* copy queues, galpa data to user space */
 636         if (context && udata) {
 637                 struct ipz_queue *ipz_rqueue = &my_qp->ipz_rqueue;
 638                 struct ipz_queue *ipz_squeue = &my_qp->ipz_squeue;
 639                 struct ehca_create_qp_resp resp;
 640                 struct vm_area_struct * vma;
 641                 memset(&resp, 0, sizeof(resp));
 642
 643                 resp.qp_num = my_qp->real_qp_num;
 644                 resp.token = my_qp->token;
 645                 resp.qp_type = my_qp->qp_type;
 646                 resp.qkey = my_qp->qkey;
 647                 resp.real_qp_num = my_qp->real_qp_num;
 648                 /* rqueue properties */
 649                 resp.ipz_rqueue.qe_size = ipz_rqueue->qe_size;
 650                 resp.ipz_rqueue.act_nr_of_sg = ipz_rqueue->act_nr_of_sg;
 651                 resp.ipz_rqueue.queue_length = ipz_rqueue->queue_length;
 652                 resp.ipz_rqueue.pagesize = ipz_rqueue->pagesize;
 653                 resp.ipz_rqueue.toggle_state = ipz_rqueue->toggle_state;
 654                 ret = ehca_mmap_nopage(((u64)(my_qp->token) << 32) | 0x22000000,
 655                                        ipz_rqueue->queue_length,
 656                                        (void**)&resp.ipz_rqueue.queue,
 657                                        &vma);
 658                 if (ret) {
 659                         ehca_err(pd->device, "Could not mmap rqueue pages");
 660                         goto create_qp_exit3;
 661                 }
 662                 my_qp->uspace_rqueue = resp.ipz_rqueue.queue;
 663                 /* squeue properties */
 664                 resp.ipz_squeue.qe_size = ipz_squeue->qe_size;
 665                 resp.ipz_squeue.act_nr_of_sg = ipz_squeue->act_nr_of_sg;
 666                 resp.ipz_squeue.queue_length = ipz_squeue->queue_length;
 667                 resp.ipz_squeue.pagesize = ipz_squeue->pagesize;
 668                 resp.ipz_squeue.toggle_state = ipz_squeue->toggle_state;
 669                 ret = ehca_mmap_nopage(((u64)(my_qp->token) << 32) | 0x23000000,
 670                                        ipz_squeue->queue_length,
 671                                        (void**)&resp.ipz_squeue.queue,
 672                                        &vma);
 673                 if (ret) {
 674                         ehca_err(pd->device, "Could not mmap squeue pages");
 675                         goto create_qp_exit4;
 676                 }
 677                 my_qp->uspace_squeue = resp.ipz_squeue.queue;
 678                 /* fw_handle */
 679                 resp.galpas = my_qp->galpas;
 680                 ret = ehca_mmap_register(my_qp->galpas.user.fw_handle,
 681                                          (void**)&resp.galpas.kernel.fw_handle,
 682                                          &vma);
 683                 if (ret) {
 684                         ehca_err(pd->device, "Could not mmap fw_handle");
 685                         goto create_qp_exit5;
 686                 }
 687                 my_qp->uspace_fwh = (u64)resp.galpas.kernel.fw_handle;
 688
 689                 if (ib_copy_to_udata(udata, &resp, sizeof resp)) {
 690                         ehca_err(pd->device, "Copy to udata failed");
 691                         ret = -EINVAL;
 692                         goto create_qp_exit6;
 693                 }
 694         }
 695
 696         return &my_qp->ib_qp;
 697
 698 create_qp_exit6:
 699         ehca_munmap(my_qp->uspace_fwh, EHCA_PAGESIZE);
 700
 701 create_qp_exit5:
 702         ehca_munmap(my_qp->uspace_squeue, my_qp->ipz_squeue.queue_length);
 703
 704 create_qp_exit4:
 705         ehca_munmap(my_qp->uspace_rqueue, my_qp->ipz_rqueue.queue_length);
 706
 707 create_qp_exit3:
 708         ipz_queue_dtor(&my_qp->ipz_rqueue);
 709         ipz_queue_dtor(&my_qp->ipz_squeue);
 710
 711 create_qp_exit2:
 712         hipz_h_destroy_qp(shca->ipz_hca_handle, my_qp);
 713
 714 create_qp_exit1:
 715         spin_lock_irqsave(&ehca_qp_idr_lock, flags);
 716         idr_remove(&ehca_qp_idr, my_qp->token);
 717         spin_unlock_irqrestore(&ehca_qp_idr_lock, flags);
 718
 719 create_qp_exit0:
 720         kmem_cache_free(qp_cache, my_qp);
 721         return ERR_PTR(ret);
 722 }
 723
 724 /*
 725  * prepare_sqe_rts called by internal_modify_qp() at trans sqe -> rts
 726  * set purge bit of bad wqe and subsequent wqes to avoid reentering sqe
 727  * returns total number of bad wqes in bad_wqe_cnt
 728  */
 729 static int prepare_sqe_rts(struct ehca_qp *my_qp, struct ehca_shca *shca,
 730                            int *bad_wqe_cnt)
 731 {
 732         u64 h_ret;
 733         struct ipz_queue *squeue;
 734         void *bad_send_wqe_p, *bad_send_wqe_v;
 735         void *squeue_start_p, *squeue_end_p;
 736         void *squeue_start_v, *squeue_end_v;
 737         struct ehca_wqe *wqe;
 738         int qp_num = my_qp->ib_qp.qp_num;
 739
 740         /* get send wqe pointer */
 741         h_ret = hipz_h_disable_and_get_wqe(shca->ipz_hca_handle,
 742                                            my_qp->ipz_qp_handle, &my_qp->pf,
 743                                            &bad_send_wqe_p, NULL, 2);
 744         if (h_ret != H_SUCCESS) {
 745                 ehca_err(&shca->ib_device, "hipz_h_disable_and_get_wqe() failed"
 746                          " ehca_qp=%p qp_num=%x h_ret=%lx",
 747                          my_qp, qp_num, h_ret);
 748                 return ehca2ib_return_code(h_ret);
 749         }
 750         bad_send_wqe_p = (void*)((u64)bad_send_wqe_p & (~(1L<<63)));
 751         ehca_dbg(&shca->ib_device, "qp_num=%x bad_send_wqe_p=%p",
 752                  qp_num, bad_send_wqe_p);
 753         /* convert wqe pointer to vadr */
 754         bad_send_wqe_v = abs_to_virt((u64)bad_send_wqe_p);
 755         if (ehca_debug_level)
 756                 ehca_dmp(bad_send_wqe_v, 32, "qp_num=%x bad_wqe", qp_num);
 757         squeue = &my_qp->ipz_squeue;
 758         squeue_start_p = (void*)virt_to_abs(ipz_qeit_calc(squeue, 0L));
 759         squeue_end_p = squeue_start_p+squeue->queue_length;
 760         squeue_start_v = abs_to_virt((u64)squeue_start_p);
 761         squeue_end_v = abs_to_virt((u64)squeue_end_p);
 762         ehca_dbg(&shca->ib_device, "qp_num=%x squeue_start_v=%p squeue_end_v=%p",
 763                  qp_num, squeue_start_v, squeue_end_v);
 764
 765         /* loop sets wqe's purge bit */
 766         wqe = (struct ehca_wqe*)bad_send_wqe_v;
 767         *bad_wqe_cnt = 0;
 768         while (wqe->optype != 0xff && wqe->wqef != 0xff) {
 769                 if (ehca_debug_level)
 770                         ehca_dmp(wqe, 32, "qp_num=%x wqe", qp_num);
 771                 wqe->nr_of_data_seg = 0; /* suppress data access */
 772                 wqe->wqef = WQEF_PURGE; /* WQE to be purged */
 773                 wqe = (struct ehca_wqe*)((u8*)wqe+squeue->qe_size);
 774                 *bad_wqe_cnt = (*bad_wqe_cnt)+1;
 775                 if ((void*)wqe >= squeue_end_v) {
 776                         wqe = squeue_start_v;
 777                 }
 778         }
 779         /*
 780          * bad wqe will be reprocessed and ignored when pol_cq() is called,
 781          *  i.e. nr of wqes with flush error status is one less
 782          */
 783         ehca_dbg(&shca->ib_device, "qp_num=%x flusherr_wqe_cnt=%x",
 784                  qp_num, (*bad_wqe_cnt)-1);
 785         wqe->wqef = 0;
 786
 787         return 0;
 788 }
 789
 790 /*
 791  * internal_modify_qp with circumvention to handle aqp0 properly
 792  * smi_reset2init indicates if this is an internal reset-to-init-call for
 793  * smi. This flag must always be zero if called from ehca_modify_qp()!
 794  * This internal func was intorduced to avoid recursion of ehca_modify_qp()!
 795  */
 796 static int internal_modify_qp(struct ib_qp *ibqp,
 797                               struct ib_qp_attr *attr,
 798                               int attr_mask, int smi_reset2init)
 799 {
 800         enum ib_qp_state qp_cur_state, qp_new_state;
 801         int cnt, qp_attr_idx, ret = 0;
 802         enum ib_qp_statetrans statetrans;
 803         struct hcp_modify_qp_control_block *mqpcb;
 804         struct ehca_qp *my_qp = container_of(ibqp, struct ehca_qp, ib_qp);
 805         struct ehca_shca *shca =
 806                 container_of(ibqp->pd->device, struct ehca_shca, ib_device);
 807         u64 update_mask;
 808         u64 h_ret;
 809         int bad_wqe_cnt = 0;
 810         int squeue_locked = 0;
 811         unsigned long spl_flags = 0;
 812
 813         /* do query_qp to obtain current attr values */
 814         mqpcb = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
 815         if (mqpcb == NULL) {
 816                 ehca_err(ibqp->device, "Could not get zeroed page for mqpcb "
 817                          "ehca_qp=%p qp_num=%x ", my_qp, ibqp->qp_num);
 818                 return -ENOMEM;
 819         }
 820
 821         h_ret = hipz_h_query_qp(shca->ipz_hca_handle,
 822                                 my_qp->ipz_qp_handle,
 823                                 &my_qp->pf,
 824                                 mqpcb, my_qp->galpas.kernel);
 825         if (h_ret != H_SUCCESS) {
 826                 ehca_err(ibqp->device, "hipz_h_query_qp() failed "
 827                          "ehca_qp=%p qp_num=%x h_ret=%lx",
 828                          my_qp, ibqp->qp_num, h_ret);
 829                 ret = ehca2ib_return_code(h_ret);
 830                 goto modify_qp_exit1;
 831         }
 832
 833         qp_cur_state = ehca2ib_qp_state(mqpcb->qp_state);
 834
 835         if (qp_cur_state == -EINVAL) {  /* invalid qp state */
 836                 ret = -EINVAL;
 837                 ehca_err(ibqp->device, "Invalid current ehca_qp_state=%x "
 838                          "ehca_qp=%p qp_num=%x",
 839                          mqpcb->qp_state, my_qp, ibqp->qp_num);
 840                 goto modify_qp_exit1;
 841         }
 842         /*
 843          * circumvention to set aqp0 initial state to init
 844          * as expected by IB spec
 845          */
 846         if (smi_reset2init == 0 &&
 847             ibqp->qp_type == IB_QPT_SMI &&
 848             qp_cur_state == IB_QPS_RESET &&
 849             (attr_mask & IB_QP_STATE) &&
 850             attr->qp_state == IB_QPS_INIT) { /* RESET -> INIT */
 851                 struct ib_qp_attr smiqp_attr = {
 852                         .qp_state = IB_QPS_INIT,
 853                         .port_num = my_qp->init_attr.port_num,
 854                         .pkey_index = 0,
 855                         .qkey = 0
 856                 };
 857                 int smiqp_attr_mask = IB_QP_STATE | IB_QP_PORT |
 858                         IB_QP_PKEY_INDEX | IB_QP_QKEY;
 859                 int smirc = internal_modify_qp(
 860                         ibqp, &smiqp_attr, smiqp_attr_mask, 1);
 861                 if (smirc) {
 862                         ehca_err(ibqp->device, "SMI RESET -> INIT failed. "
 863                                  "ehca_modify_qp() rc=%x", smirc);
 864                         ret = H_PARAMETER;
 865                         goto modify_qp_exit1;
 866                 }
 867                 qp_cur_state = IB_QPS_INIT;
 868                 ehca_dbg(ibqp->device, "SMI RESET -> INIT succeeded");
 869         }
 870         /* is transmitted current state  equal to "real" current state */
 871         if ((attr_mask & IB_QP_CUR_STATE) &&
 872             qp_cur_state != attr->cur_qp_state) {
 873                 ret = -EINVAL;
 874                 ehca_err(ibqp->device,
 875                          "Invalid IB_QP_CUR_STATE attr->curr_qp_state=%x <>"
 876                          " actual cur_qp_state=%x. ehca_qp=%p qp_num=%x",
 877                          attr->cur_qp_state, qp_cur_state, my_qp, ibqp->qp_num);
 878                 goto modify_qp_exit1;
 879         }
 880
 881         ehca_dbg(ibqp->device,"ehca_qp=%p qp_num=%x current qp_state=%x "
 882                  "new qp_state=%x attribute_mask=%x",
 883                  my_qp, ibqp->qp_num, qp_cur_state, attr->qp_state, attr_mask);
 884
 885         qp_new_state = attr_mask & IB_QP_STATE ? attr->qp_state : qp_cur_state;
 886         if (!smi_reset2init &&
 887             !ib_modify_qp_is_ok(qp_cur_state, qp_new_state, ibqp->qp_type,
 888                                 attr_mask)) {
 889                 ret = -EINVAL;
 890                 ehca_err(ibqp->device,
 891                          "Invalid qp transition new_state=%x cur_state=%x "
 892                          "ehca_qp=%p qp_num=%x attr_mask=%x", qp_new_state,
 893                          qp_cur_state, my_qp, ibqp->qp_num, attr_mask);
 894                 goto modify_qp_exit1;
 895         }
 896
 897         if ((mqpcb->qp_state = ib2ehca_qp_state(qp_new_state)))
 898                 update_mask = EHCA_BMASK_SET(MQPCB_MASK_QP_STATE, 1);
 899         else {
 900                 ret = -EINVAL;
 901                 ehca_err(ibqp->device, "Invalid new qp state=%x "
 902                          "ehca_qp=%p qp_num=%x",
 903                          qp_new_state, my_qp, ibqp->qp_num);
 904                 goto modify_qp_exit1;
 905         }
 906
 907         /* retrieve state transition struct to get req and opt attrs */
 908         statetrans = get_modqp_statetrans(qp_cur_state, qp_new_state);
 909         if (statetrans < 0) {
 910                 ret = -EINVAL;
 911                 ehca_err(ibqp->device, "<INVALID STATE CHANGE> qp_cur_state=%x "
 912                          "new_qp_state=%x State_xsition=%x ehca_qp=%p "
 913                          "qp_num=%x", qp_cur_state, qp_new_state,
 914                          statetrans, my_qp, ibqp->qp_num);
 915                 goto modify_qp_exit1;
 916         }
 917
 918         qp_attr_idx = ib2ehcaqptype(ibqp->qp_type);
 919
 920         if (qp_attr_idx < 0) {
 921                 ret = qp_attr_idx;
 922                 ehca_err(ibqp->device,
 923                          "Invalid QP type=%x ehca_qp=%p qp_num=%x",
 924                          ibqp->qp_type, my_qp, ibqp->qp_num);
 925                 goto modify_qp_exit1;
 926         }
 927
 928         ehca_dbg(ibqp->device,
 929                  "ehca_qp=%p qp_num=%x <VALID STATE CHANGE> qp_state_xsit=%x",
 930                  my_qp, ibqp->qp_num, statetrans);
 931
 932         /* sqe -> rts: set purge bit of bad wqe before actual trans */
 933         if ((my_qp->qp_type == IB_QPT_UD ||
 934              my_qp->qp_type == IB_QPT_GSI ||
 935              my_qp->qp_type == IB_QPT_SMI) &&
 936             statetrans == IB_QPST_SQE2RTS) {
 937                 /* mark next free wqe if kernel */
 938                 if (my_qp->uspace_squeue == 0) {
 939                         struct ehca_wqe *wqe;
 940                         /* lock send queue */
 941                         spin_lock_irqsave(&my_qp->spinlock_s, spl_flags);
 942                         squeue_locked = 1;
 943                         /* mark next free wqe */
 944                         wqe = (struct ehca_wqe*)
 945                                 ipz_qeit_get(&my_qp->ipz_squeue);
 946                         wqe->optype = wqe->wqef = 0xff;
 947                         ehca_dbg(ibqp->device, "qp_num=%x next_free_wqe=%p",
 948                                  ibqp->qp_num, wqe);
 949                 }
 950                 ret = prepare_sqe_rts(my_qp, shca, &bad_wqe_cnt);
 951                 if (ret) {
 952                         ehca_err(ibqp->device, "prepare_sqe_rts() failed "
 953                                  "ehca_qp=%p qp_num=%x ret=%x",
 954                                  my_qp, ibqp->qp_num, ret);
 955                         goto modify_qp_exit2;
 956                 }
 957         }
 958
 959         /*
 960          * enable RDMA_Atomic_Control if reset->init und reliable con
 961          * this is necessary since gen2 does not provide that flag,
 962          * but pHyp requires it
 963          */
 964         if (statetrans == IB_QPST_RESET2INIT &&
 965             (ibqp->qp_type == IB_QPT_RC || ibqp->qp_type == IB_QPT_UC)) {
 966                 mqpcb->rdma_atomic_ctrl = 3;
 967                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_RDMA_ATOMIC_CTRL, 1);
 968         }
 969         /* circ. pHyp requires #RDMA/Atomic Resp Res for UC INIT -> RTR */
 970         if (statetrans == IB_QPST_INIT2RTR &&
 971             (ibqp->qp_type == IB_QPT_UC) &&
 972             !(attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)) {
 973                 mqpcb->rdma_nr_atomic_resp_res = 1; /* default to 1 */
 974                 update_mask |=
 975                         EHCA_BMASK_SET(MQPCB_MASK_RDMA_NR_ATOMIC_RESP_RES, 1);
 976         }
 977
 978         if (attr_mask & IB_QP_PKEY_INDEX) {
 979                 mqpcb->prim_p_key_idx = attr->pkey_index;
 980                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_PRIM_P_KEY_IDX, 1);
 981         }
 982         if (attr_mask & IB_QP_PORT) {
 983                 if (attr->port_num < 1 || attr->port_num > shca->num_ports) {
 984                         ret = -EINVAL;
 985                         ehca_err(ibqp->device, "Invalid port=%x. "
 986                                  "ehca_qp=%p qp_num=%x num_ports=%x",
 987                                  attr->port_num, my_qp, ibqp->qp_num,
 988                                  shca->num_ports);
 989                         goto modify_qp_exit2;
 990                 }
 991                 mqpcb->prim_phys_port = attr->port_num;
 992                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_PRIM_PHYS_PORT, 1);
 993         }
 994         if (attr_mask & IB_QP_QKEY) {
 995                 mqpcb->qkey = attr->qkey;
 996                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_QKEY, 1);
 997         }
 998         if (attr_mask & IB_QP_AV) {
 999                 int ah_mult = ib_rate_to_mult(attr->ah_attr.static_rate);
1000                 int ehca_mult = ib_rate_to_mult(shca->sport[my_qp->
1001                                                 init_attr.port_num].rate);
1002
1003                 mqpcb->dlid = attr->ah_attr.dlid;
1004                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_DLID, 1);
1005                 mqpcb->source_path_bits = attr->ah_attr.src_path_bits;
1006                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_SOURCE_PATH_BITS, 1);
1007                 mqpcb->service_level = attr->ah_attr.sl;
1008                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_SERVICE_LEVEL, 1);
1009
1010                 if (ah_mult < ehca_mult)
1011                         mqpcb->max_static_rate = (ah_mult > 0) ?
1012                         ((ehca_mult - 1) / ah_mult) : 0;
1013                 else
1014                         mqpcb->max_static_rate = 0;
1015
1016                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_MAX_STATIC_RATE, 1);
1017
1018                 /*
1019                  * only if GRH is TRUE we might consider SOURCE_GID_IDX
1020                  * and DEST_GID otherwise phype will return H_ATTR_PARM!!!
1021                  */
1022                 if (attr->ah_attr.ah_flags == IB_AH_GRH) {
1023                         mqpcb->send_grh_flag = 1 << 31;
1024                         update_mask |=
1025                                 EHCA_BMASK_SET(MQPCB_MASK_SEND_GRH_FLAG, 1);
1026                         mqpcb->source_gid_idx = attr->ah_attr.grh.sgid_index;
1027                         update_mask |=
1028                                 EHCA_BMASK_SET(MQPCB_MASK_SOURCE_GID_IDX, 1);
1029
1030                         for (cnt = 0; cnt < 16; cnt++)
1031                                 mqpcb->dest_gid.byte[cnt] =
1032                                         attr->ah_attr.grh.dgid.raw[cnt];
1033
1034                         update_mask |= EHCA_BMASK_SET(MQPCB_MASK_DEST_GID, 1);
1035                         mqpcb->flow_label = attr->ah_attr.grh.flow_label;
1036                         update_mask |= EHCA_BMASK_SET(MQPCB_MASK_FLOW_LABEL, 1);
1037                         mqpcb->hop_limit = attr->ah_attr.grh.hop_limit;
1038                         update_mask |= EHCA_BMASK_SET(MQPCB_MASK_HOP_LIMIT, 1);
1039                         mqpcb->traffic_class = attr->ah_attr.grh.traffic_class;
1040                         update_mask |=
1041                                 EHCA_BMASK_SET(MQPCB_MASK_TRAFFIC_CLASS, 1);
1042                 }
1043         }
1044
1045         if (attr_mask & IB_QP_PATH_MTU) {
1046                 mqpcb->path_mtu = attr->path_mtu;
1047                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_PATH_MTU, 1);
1048         }
1049         if (attr_mask & IB_QP_TIMEOUT) {
1050                 mqpcb->timeout = attr->timeout;
1051                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_TIMEOUT, 1);
1052         }
1053         if (attr_mask & IB_QP_RETRY_CNT) {
1054                 mqpcb->retry_count = attr->retry_cnt;
1055                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_RETRY_COUNT, 1);
1056         }
1057         if (attr_mask & IB_QP_RNR_RETRY) {
1058                 mqpcb->rnr_retry_count = attr->rnr_retry;
1059                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_RNR_RETRY_COUNT, 1);
1060         }
1061         if (attr_mask & IB_QP_RQ_PSN) {
1062                 mqpcb->receive_psn = attr->rq_psn;
1063                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_RECEIVE_PSN, 1);
1064         }
1065         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
1066                 mqpcb->rdma_nr_atomic_resp_res = attr->max_dest_rd_atomic < 3 ?
1067                         attr->max_dest_rd_atomic : 2;
1068                 update_mask |=
1069                         EHCA_BMASK_SET(MQPCB_MASK_RDMA_NR_ATOMIC_RESP_RES, 1);
1070         }
1071         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
1072                 mqpcb->rdma_atomic_outst_dest_qp = attr->max_rd_atomic < 3 ?
1073                         attr->max_rd_atomic : 2;
1074                 update_mask |=
1075                         EHCA_BMASK_SET
1076                         (MQPCB_MASK_RDMA_ATOMIC_OUTST_DEST_QP, 1);
1077         }
1078         if (attr_mask & IB_QP_ALT_PATH) {
1079                 int ah_mult = ib_rate_to_mult(attr->alt_ah_attr.static_rate);
1080                 int ehca_mult = ib_rate_to_mult(
1081                         shca->sport[my_qp->init_attr.port_num].rate);
1082
1083                 mqpcb->dlid_al = attr->alt_ah_attr.dlid;
1084                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_DLID_AL, 1);
1085                 mqpcb->source_path_bits_al = attr->alt_ah_attr.src_path_bits;
1086                 update_mask |=
1087                         EHCA_BMASK_SET(MQPCB_MASK_SOURCE_PATH_BITS_AL, 1);
1088                 mqpcb->service_level_al = attr->alt_ah_attr.sl;
1089                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_SERVICE_LEVEL_AL, 1);
1090
1091                 if (ah_mult < ehca_mult)
1092                         mqpcb->max_static_rate = (ah_mult > 0) ?
1093                         ((ehca_mult - 1) / ah_mult) : 0;
1094                 else
1095                         mqpcb->max_static_rate_al = 0;
1096
1097                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_MAX_STATIC_RATE_AL, 1);
1098
1099                 /*
1100                  * only if GRH is TRUE we might consider SOURCE_GID_IDX
1101                  * and DEST_GID otherwise phype will return H_ATTR_PARM!!!
1102                  */
1103                 if (attr->alt_ah_attr.ah_flags == IB_AH_GRH) {
1104                         mqpcb->send_grh_flag_al = 1 << 31;
1105                         update_mask |=
1106                                 EHCA_BMASK_SET(MQPCB_MASK_SEND_GRH_FLAG_AL, 1);
1107                         mqpcb->source_gid_idx_al =
1108                                 attr->alt_ah_attr.grh.sgid_index;
1109                         update_mask |=
1110                                 EHCA_BMASK_SET(MQPCB_MASK_SOURCE_GID_IDX_AL, 1);
1111
1112                         for (cnt = 0; cnt < 16; cnt++)
1113                                 mqpcb->dest_gid_al.byte[cnt] =
1114                                         attr->alt_ah_attr.grh.dgid.raw[cnt];
1115
1116                         update_mask |=
1117                                 EHCA_BMASK_SET(MQPCB_MASK_DEST_GID_AL, 1);
1118                         mqpcb->flow_label_al = attr->alt_ah_attr.grh.flow_label;
1119                         update_mask |=
1120                                 EHCA_BMASK_SET(MQPCB_MASK_FLOW_LABEL_AL, 1);
1121                         mqpcb->hop_limit_al = attr->alt_ah_attr.grh.hop_limit;
1122                         update_mask |=
1123                                 EHCA_BMASK_SET(MQPCB_MASK_HOP_LIMIT_AL, 1);
1124                         mqpcb->traffic_class_al =
1125                                 attr->alt_ah_attr.grh.traffic_class;
1126                         update_mask |=
1127                                 EHCA_BMASK_SET(MQPCB_MASK_TRAFFIC_CLASS_AL, 1);
1128                 }
1129         }
1130
1131         if (attr_mask & IB_QP_MIN_RNR_TIMER) {
1132                 mqpcb->min_rnr_nak_timer_field = attr->min_rnr_timer;
1133                 update_mask |=
1134                         EHCA_BMASK_SET(MQPCB_MASK_MIN_RNR_NAK_TIMER_FIELD, 1);
1135         }
1136
1137         if (attr_mask & IB_QP_SQ_PSN) {
1138                 mqpcb->send_psn = attr->sq_psn;
1139                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_SEND_PSN, 1);
1140         }
1141
1142         if (attr_mask & IB_QP_DEST_QPN) {
1143                 mqpcb->dest_qp_nr = attr->dest_qp_num;
1144                 update_mask |= EHCA_BMASK_SET(MQPCB_MASK_DEST_QP_NR, 1);
1145         }
1146
1147         if (attr_mask & IB_QP_PATH_MIG_STATE) {
1148                 mqpcb->path_migration_state = attr->path_mig_state;
1149                 update_mask |=
1150                         EHCA_BMASK_SET(MQPCB_MASK_PATH_MIGRATION_STATE, 1);
1151         }
1152
1153         if (attr_mask & IB_QP_CAP) {
1154                 mqpcb->max_nr_outst_send_wr = attr->cap.max_send_wr+1;
1155                 update_mask |=
1156                         EHCA_BMASK_SET(MQPCB_MASK_MAX_NR_OUTST_SEND_WR, 1);
1157                 mqpcb->max_nr_outst_recv_wr = attr->cap.max_recv_wr+1;
1158                 update_mask |=
1159                         EHCA_BMASK_SET(MQPCB_MASK_MAX_NR_OUTST_RECV_WR, 1);
1160                 /* no support for max_send/recv_sge yet */
1161         }
1162
1163         if (ehca_debug_level)
1164                 ehca_dmp(mqpcb, 4*70, "qp_num=%x", ibqp->qp_num);
1165
1166         h_ret = hipz_h_modify_qp(shca->ipz_hca_handle,
1167                                  my_qp->ipz_qp_handle,
1168                                  &my_qp->pf,
1169                                  update_mask,
1170                                  mqpcb, my_qp->galpas.kernel);
1171
1172         if (h_ret != H_SUCCESS) {
1173                 ret = ehca2ib_return_code(h_ret);
1174                 ehca_err(ibqp->device, "hipz_h_modify_qp() failed rc=%lx "
1175                          "ehca_qp=%p qp_num=%x",h_ret, my_qp, ibqp->qp_num);
1176                 goto modify_qp_exit2;
1177         }
1178
1179         if ((my_qp->qp_type == IB_QPT_UD ||
1180              my_qp->qp_type == IB_QPT_GSI ||
1181              my_qp->qp_type == IB_QPT_SMI) &&
1182             statetrans == IB_QPST_SQE2RTS) {
1183                 /* doorbell to reprocessing wqes */
1184                 iosync(); /* serialize GAL register access */
1185                 hipz_update_sqa(my_qp, bad_wqe_cnt-1);
1186                 ehca_gen_dbg("doorbell for %x wqes", bad_wqe_cnt);
1187         }
1188
1189         if (statetrans == IB_QPST_RESET2INIT ||
1190             statetrans == IB_QPST_INIT2INIT) {
1191                 mqpcb->qp_enable = 1;
1192                 mqpcb->qp_state = EHCA_QPS_INIT;
1193                 update_mask = 0;
1194                 update_mask = EHCA_BMASK_SET(MQPCB_MASK_QP_ENABLE, 1);
1195
1196                 h_ret = hipz_h_modify_qp(shca->ipz_hca_handle,
1197                                          my_qp->ipz_qp_handle,
1198                                          &my_qp->pf,
1199                                          update_mask,
1200                                          mqpcb,
1201                                          my_qp->galpas.kernel);
1202
1203                 if (h_ret != H_SUCCESS) {
1204                         ret = ehca2ib_return_code(h_ret);
1205                         ehca_err(ibqp->device, "ENABLE in context of "
1206                                  "RESET_2_INIT failed! Maybe you didn't get "
1207                                  "a LID h_ret=%lx ehca_qp=%p qp_num=%x",
1208                                  h_ret, my_qp, ibqp->qp_num);
1209                         goto modify_qp_exit2;
1210                 }
1211         }
1212
1213         if (statetrans == IB_QPST_ANY2RESET) {
1214                 ipz_qeit_reset(&my_qp->ipz_rqueue);
1215                 ipz_qeit_reset(&my_qp->ipz_squeue);
1216         }
1217
1218         if (attr_mask & IB_QP_QKEY)
1219                 my_qp->qkey = attr->qkey;
1220
1221 modify_qp_exit2:
1222         if (squeue_locked) { /* this means: sqe -> rts */
1223                 spin_unlock_irqrestore(&my_qp->spinlock_s, spl_flags);
1224                 my_qp->sqerr_purgeflag = 1;
1225         }
1226
1227 modify_qp_exit1:
1228         kfree(mqpcb);
1229
1230         return ret;
1231 }
1232
1233 int ehca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask,
1234                    struct ib_udata *udata)
1235 {
1236         struct ehca_qp *my_qp = container_of(ibqp, struct ehca_qp, ib_qp);
1237         struct ehca_pd *my_pd = container_of(my_qp->ib_qp.pd, struct ehca_pd,
1238                                              ib_pd);
1239         u32 cur_pid = current->tgid;
1240
1241         if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
1242             my_pd->ownpid != cur_pid) {
1243                 ehca_err(ibqp->pd->device, "Invalid caller pid=%x ownpid=%x",
1244                          cur_pid, my_pd->ownpid);
1245                 return -EINVAL;
1246         }
1247
1248         return internal_modify_qp(ibqp, attr, attr_mask, 0);
1249 }
1250
1251 int ehca_query_qp(struct ib_qp *qp,
1252                   struct ib_qp_attr *qp_attr,
1253                   int qp_attr_mask, struct ib_qp_init_attr *qp_init_attr)
1254 {
1255         struct ehca_qp *my_qp = container_of(qp, struct ehca_qp, ib_qp);
1256         struct ehca_pd *my_pd = container_of(my_qp->ib_qp.pd, struct ehca_pd,
1257                                              ib_pd);
1258         struct ehca_shca *shca = container_of(qp->device, struct ehca_shca,
1259                                               ib_device);
1260         struct ipz_adapter_handle adapter_handle = shca->ipz_hca_handle;
1261         struct hcp_modify_qp_control_block *qpcb;
1262         u32 cur_pid = current->tgid;
1263         int cnt, ret = 0;
1264         u64 h_ret;
1265
1266         if (my_pd->ib_pd.uobject  && my_pd->ib_pd.uobject->context  &&
1267             my_pd->ownpid != cur_pid) {
1268                 ehca_err(qp->device, "Invalid caller pid=%x ownpid=%x",
1269                          cur_pid, my_pd->ownpid);
1270                 return -EINVAL;
1271         }
1272
1273         if (qp_attr_mask & QP_ATTR_QUERY_NOT_SUPPORTED) {
1274                 ehca_err(qp->device,"Invalid attribute mask "
1275                          "ehca_qp=%p qp_num=%x qp_attr_mask=%x ",
1276                          my_qp, qp->qp_num, qp_attr_mask);
1277                 return -EINVAL;
1278         }
1279
1280         qpcb = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL );
1281         if (!qpcb) {
1282                 ehca_err(qp->device,"Out of memory for qpcb "
1283                          "ehca_qp=%p qp_num=%x", my_qp, qp->qp_num);
1284                 return -ENOMEM;
1285         }
1286
1287         h_ret = hipz_h_query_qp(adapter_handle,
1288                                 my_qp->ipz_qp_handle,
1289                                 &my_qp->pf,
1290                                 qpcb, my_qp->galpas.kernel);
1291
1292         if (h_ret != H_SUCCESS) {
1293                 ret = ehca2ib_return_code(h_ret);
1294                 ehca_err(qp->device,"hipz_h_query_qp() failed "
1295                          "ehca_qp=%p qp_num=%x h_ret=%lx",
1296                          my_qp, qp->qp_num, h_ret);
1297                 goto query_qp_exit1;
1298         }
1299
1300         qp_attr->cur_qp_state = ehca2ib_qp_state(qpcb->qp_state);
1301         qp_attr->qp_state = qp_attr->cur_qp_state;
1302
1303         if (qp_attr->cur_qp_state == -EINVAL) {
1304                 ret = -EINVAL;
1305                 ehca_err(qp->device,"Got invalid ehca_qp_state=%x "
1306                          "ehca_qp=%p qp_num=%x",
1307                          qpcb->qp_state, my_qp, qp->qp_num);
1308                 goto query_qp_exit1;
1309         }
1310
1311         if (qp_attr->qp_state == IB_QPS_SQD)
1312                 qp_attr->sq_draining = 1;
1313
1314         qp_attr->qkey = qpcb->qkey;
1315         qp_attr->path_mtu = qpcb->path_mtu;
1316         qp_attr->path_mig_state = qpcb->path_migration_state;
1317         qp_attr->rq_psn = qpcb->receive_psn;
1318         qp_attr->sq_psn = qpcb->send_psn;
1319         qp_attr->min_rnr_timer = qpcb->min_rnr_nak_timer_field;
1320         qp_attr->cap.max_send_wr = qpcb->max_nr_outst_send_wr-1;
1321         qp_attr->cap.max_recv_wr = qpcb->max_nr_outst_recv_wr-1;
1322         /* UD_AV CIRCUMVENTION */
1323         if (my_qp->qp_type == IB_QPT_UD) {
1324                 qp_attr->cap.max_send_sge =
1325                         qpcb->actual_nr_sges_in_sq_wqe - 2;
1326                 qp_attr->cap.max_recv_sge =
1327                         qpcb->actual_nr_sges_in_rq_wqe - 2;
1328         } else {
1329                 qp_attr->cap.max_send_sge =
1330                         qpcb->actual_nr_sges_in_sq_wqe;
1331                 qp_attr->cap.max_recv_sge =
1332                         qpcb->actual_nr_sges_in_rq_wqe;
1333         }
1334
1335         qp_attr->cap.max_inline_data = my_qp->sq_max_inline_data_size;
1336         qp_attr->dest_qp_num = qpcb->dest_qp_nr;
1337
1338         qp_attr->pkey_index =
1339                 EHCA_BMASK_GET(MQPCB_PRIM_P_KEY_IDX, qpcb->prim_p_key_idx);
1340
1341         qp_attr->port_num =
1342                 EHCA_BMASK_GET(MQPCB_PRIM_PHYS_PORT, qpcb->prim_phys_port);
1343
1344         qp_attr->timeout = qpcb->timeout;
1345         qp_attr->retry_cnt = qpcb->retry_count;
1346         qp_attr->rnr_retry = qpcb->rnr_retry_count;
1347
1348         qp_attr->alt_pkey_index =
1349                 EHCA_BMASK_GET(MQPCB_PRIM_P_KEY_IDX, qpcb->alt_p_key_idx);
1350
1351         qp_attr->alt_port_num = qpcb->alt_phys_port;
1352         qp_attr->alt_timeout = qpcb->timeout_al;
1353
1354         /* primary av */
1355         qp_attr->ah_attr.sl = qpcb->service_level;
1356
1357         if (qpcb->send_grh_flag) {
1358                 qp_attr->ah_attr.ah_flags = IB_AH_GRH;
1359         }
1360
1361         qp_attr->ah_attr.static_rate = qpcb->max_static_rate;
1362         qp_attr->ah_attr.dlid = qpcb->dlid;
1363         qp_attr->ah_attr.src_path_bits = qpcb->source_path_bits;
1364         qp_attr->ah_attr.port_num = qp_attr->port_num;
1365
1366         /* primary GRH */
1367         qp_attr->ah_attr.grh.traffic_class = qpcb->traffic_class;
1368         qp_attr->ah_attr.grh.hop_limit = qpcb->hop_limit;
1369         qp_attr->ah_attr.grh.sgid_index = qpcb->source_gid_idx;
1370         qp_attr->ah_attr.grh.flow_label = qpcb->flow_label;
1371
1372         for (cnt = 0; cnt < 16; cnt++)
1373                 qp_attr->ah_attr.grh.dgid.raw[cnt] =
1374                         qpcb->dest_gid.byte[cnt];
1375
1376         /* alternate AV */
1377         qp_attr->alt_ah_attr.sl = qpcb->service_level_al;
1378         if (qpcb->send_grh_flag_al) {
1379                 qp_attr->alt_ah_attr.ah_flags = IB_AH_GRH;
1380         }
1381
1382         qp_attr->alt_ah_attr.static_rate = qpcb->max_static_rate_al;
1383         qp_attr->alt_ah_attr.dlid = qpcb->dlid_al;
1384         qp_attr->alt_ah_attr.src_path_bits = qpcb->source_path_bits_al;
1385
1386         /* alternate GRH */
1387         qp_attr->alt_ah_attr.grh.traffic_class = qpcb->traffic_class_al;
1388         qp_attr->alt_ah_attr.grh.hop_limit = qpcb->hop_limit_al;
1389         qp_attr->alt_ah_attr.grh.sgid_index = qpcb->source_gid_idx_al;
1390         qp_attr->alt_ah_attr.grh.flow_label = qpcb->flow_label_al;
1391
1392         for (cnt = 0; cnt < 16; cnt++)
1393                 qp_attr->alt_ah_attr.grh.dgid.raw[cnt] =
1394                         qpcb->dest_gid_al.byte[cnt];
1395
1396         /* return init attributes given in ehca_create_qp */
1397         if (qp_init_attr)
1398                 *qp_init_attr = my_qp->init_attr;
1399
1400         if (ehca_debug_level)
1401                 ehca_dmp(qpcb, 4*70, "qp_num=%x", qp->qp_num);
1402
1403 query_qp_exit1:
1404         kfree(qpcb);
1405
1406         return ret;
1407 }
1408
1409 int ehca_destroy_qp(struct ib_qp *ibqp)
1410 {
1411         struct ehca_qp *my_qp = container_of(ibqp, struct ehca_qp, ib_qp);
1412         struct ehca_shca *shca = container_of(ibqp->device, struct ehca_shca,
1413                                               ib_device);
1414         struct ehca_pd *my_pd = container_of(my_qp->ib_qp.pd, struct ehca_pd,
1415                                              ib_pd);
1416         u32 cur_pid = current->tgid;
1417         u32 qp_num = ibqp->qp_num;
1418         int ret;
1419         u64 h_ret;
1420         u8 port_num;
1421         enum ib_qp_type qp_type;
1422         unsigned long flags;
1423
1424         if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
1425             my_pd->ownpid != cur_pid) {
1426                 ehca_err(ibqp->device, "Invalid caller pid=%x ownpid=%x",
1427                          cur_pid, my_pd->ownpid);
1428                 return -EINVAL;
1429         }
1430
1431         if (my_qp->send_cq) {
1432                 ret = ehca_cq_unassign_qp(my_qp->send_cq,
1433                                               my_qp->real_qp_num);
1434                 if (ret) {
1435                         ehca_err(ibqp->device, "Couldn't unassign qp from "
1436                                  "send_cq ret=%x qp_num=%x cq_num=%x", ret,
1437                                  my_qp->ib_qp.qp_num, my_qp->send_cq->cq_number);
1438                         return ret;
1439                 }
1440         }
1441
1442         spin_lock_irqsave(&ehca_qp_idr_lock, flags);
1443         idr_remove(&ehca_qp_idr, my_qp->token);
1444         spin_unlock_irqrestore(&ehca_qp_idr_lock, flags);
1445
1446         /* un-mmap if vma alloc */
1447         if (my_qp->uspace_rqueue) {
1448                 ret = ehca_munmap(my_qp->uspace_rqueue,
1449                                   my_qp->ipz_rqueue.queue_length);
1450                 if (ret)
1451                         ehca_err(ibqp->device, "Could not munmap rqueue "
1452                                  "qp_num=%x", qp_num);
1453                 ret = ehca_munmap(my_qp->uspace_squeue,
1454                                   my_qp->ipz_squeue.queue_length);
1455                 if (ret)
1456                         ehca_err(ibqp->device, "Could not munmap squeue "
1457                                  "qp_num=%x", qp_num);
1458                 ret = ehca_munmap(my_qp->uspace_fwh, EHCA_PAGESIZE);
1459                 if (ret)
1460                         ehca_err(ibqp->device, "Could not munmap fwh qp_num=%x",
1461                                  qp_num);
1462         }
1463
1464         h_ret = hipz_h_destroy_qp(shca->ipz_hca_handle, my_qp);
1465         if (h_ret != H_SUCCESS) {
1466                 ehca_err(ibqp->device, "hipz_h_destroy_qp() failed rc=%lx "
1467                          "ehca_qp=%p qp_num=%x", h_ret, my_qp, qp_num);
1468                 return ehca2ib_return_code(h_ret);
1469         }
1470
1471         port_num = my_qp->init_attr.port_num;
1472         qp_type  = my_qp->init_attr.qp_type;
1473
1474         /* no support for IB_QPT_SMI yet */
1475         if (qp_type == IB_QPT_GSI) {
1476                 struct ib_event event;
1477                 ehca_info(ibqp->device, "device %s: port %x is inactive.",
1478                           shca->ib_device.name, port_num);
1479                 event.device = &shca->ib_device;
1480                 event.event = IB_EVENT_PORT_ERR;
1481                 event.element.port_num = port_num;
1482                 shca->sport[port_num - 1].port_state = IB_PORT_DOWN;
1483                 ib_dispatch_event(&event);
1484         }
1485
1486         ipz_queue_dtor(&my_qp->ipz_rqueue);
1487         ipz_queue_dtor(&my_qp->ipz_squeue);
1488         kmem_cache_free(qp_cache, my_qp);
1489         return 0;
1490 }
1491
1492 int ehca_init_qp_cache(void)
1493 {
1494         qp_cache = kmem_cache_create("ehca_cache_qp",
1495                                      sizeof(struct ehca_qp), 0,
1496                                      SLAB_HWCACHE_ALIGN,
1497                                      NULL, NULL);
1498         if (!qp_cache)
1499                 return -ENOMEM;
1500         return 0;
1501 }
1502
1503 void ehca_cleanup_qp_cache(void)
1504 {
1505         if (qp_cache)
1506                 kmem_cache_destroy(qp_cache);
1507 }