git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/hw/ehca/ehca_reqs.c

   1 /*
   2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3  *
   4  *  post_send/recv, poll_cq, req_notify
   5  *
   6  *  Authors: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
   7  *           Waleri Fomin <fomin@de.ibm.com>
   8  *           Joachim Fenkes <fenkes@de.ibm.com>
   9  *           Reinhard Ernst <rernst@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-powerpc/system.h>
  46 #include "ehca_classes.h"
  47 #include "ehca_tools.h"
  48 #include "ehca_qes.h"
  49 #include "ehca_iverbs.h"
  50 #include "hcp_if.h"
  51 #include "hipz_fns.h"
  52
  53 /* in RC traffic, insert an empty RDMA READ every this many packets */
  54 #define ACK_CIRC_THRESHOLD 2000000
  55
  56 static inline int ehca_write_rwqe(struct ipz_queue *ipz_rqueue,
  57                                   struct ehca_wqe *wqe_p,
  58                                   struct ib_recv_wr *recv_wr)
  59 {
  60         u8 cnt_ds;
  61         if (unlikely((recv_wr->num_sge < 0) ||
  62                      (recv_wr->num_sge > ipz_rqueue->act_nr_of_sg))) {
  63                 ehca_gen_err("Invalid number of WQE SGE. "
  64                          "num_sqe=%x max_nr_of_sg=%x",
  65                          recv_wr->num_sge, ipz_rqueue->act_nr_of_sg);
  66                 return -EINVAL; /* invalid SG list length */
  67         }
  68
  69         /* clear wqe header until sglist */
  70         memset(wqe_p, 0, offsetof(struct ehca_wqe, u.ud_av.sg_list));
  71
  72         wqe_p->work_request_id = recv_wr->wr_id;
  73         wqe_p->nr_of_data_seg = recv_wr->num_sge;
  74
  75         for (cnt_ds = 0; cnt_ds < recv_wr->num_sge; cnt_ds++) {
  76                 wqe_p->u.all_rcv.sg_list[cnt_ds].vaddr =
  77                         recv_wr->sg_list[cnt_ds].addr;
  78                 wqe_p->u.all_rcv.sg_list[cnt_ds].lkey =
  79                         recv_wr->sg_list[cnt_ds].lkey;
  80                 wqe_p->u.all_rcv.sg_list[cnt_ds].length =
  81                         recv_wr->sg_list[cnt_ds].length;
  82         }
  83
  84         if (ehca_debug_level >= 3) {
  85                 ehca_gen_dbg("RECEIVE WQE written into ipz_rqueue=%p",
  86                              ipz_rqueue);
  87                 ehca_dmp(wqe_p, 16*(6 + wqe_p->nr_of_data_seg), "recv wqe");
  88         }
  89
  90         return 0;
  91 }
  92
  93 #if defined(DEBUG_GSI_SEND_WR)
  94
  95 /* need ib_mad struct */
  96 #include <rdma/ib_mad.h>
  97
  98 static void trace_send_wr_ud(const struct ib_send_wr *send_wr)
  99 {
 100         int idx;
 101         int j;
 102         while (send_wr) {
 103                 struct ib_mad_hdr *mad_hdr = send_wr->wr.ud.mad_hdr;
 104                 struct ib_sge *sge = send_wr->sg_list;
 105                 ehca_gen_dbg("send_wr#%x wr_id=%lx num_sge=%x "
 106                              "send_flags=%x opcode=%x", idx, send_wr->wr_id,
 107                              send_wr->num_sge, send_wr->send_flags,
 108                              send_wr->opcode);
 109                 if (mad_hdr) {
 110                         ehca_gen_dbg("send_wr#%x mad_hdr base_version=%x "
 111                                      "mgmt_class=%x class_version=%x method=%x "
 112                                      "status=%x class_specific=%x tid=%lx "
 113                                      "attr_id=%x resv=%x attr_mod=%x",
 114                                      idx, mad_hdr->base_version,
 115                                      mad_hdr->mgmt_class,
 116                                      mad_hdr->class_version, mad_hdr->method,
 117                                      mad_hdr->status, mad_hdr->class_specific,
 118                                      mad_hdr->tid, mad_hdr->attr_id,
 119                                      mad_hdr->resv,
 120                                      mad_hdr->attr_mod);
 121                 }
 122                 for (j = 0; j < send_wr->num_sge; j++) {
 123                         u8 *data = (u8 *)abs_to_virt(sge->addr);
 124                         ehca_gen_dbg("send_wr#%x sge#%x addr=%p length=%x "
 125                                      "lkey=%x",
 126                                      idx, j, data, sge->length, sge->lkey);
 127                         /* assume length is n*16 */
 128                         ehca_dmp(data, sge->length, "send_wr#%x sge#%x",
 129                                  idx, j);
 130                         sge++;
 131                 } /* eof for j */
 132                 idx++;
 133                 send_wr = send_wr->next;
 134         } /* eof while send_wr */
 135 }
 136
 137 #endif /* DEBUG_GSI_SEND_WR */
 138
 139 static inline int ehca_write_swqe(struct ehca_qp *qp,
 140                                   struct ehca_wqe *wqe_p,
 141                                   const struct ib_send_wr *send_wr,
 142                                   int hidden)
 143 {
 144         u32 idx;
 145         u64 dma_length;
 146         struct ehca_av *my_av;
 147         u32 remote_qkey = send_wr->wr.ud.remote_qkey;
 148
 149         if (unlikely((send_wr->num_sge < 0) ||
 150                      (send_wr->num_sge > qp->ipz_squeue.act_nr_of_sg))) {
 151                 ehca_gen_err("Invalid number of WQE SGE. "
 152                          "num_sqe=%x max_nr_of_sg=%x",
 153                          send_wr->num_sge, qp->ipz_squeue.act_nr_of_sg);
 154                 return -EINVAL; /* invalid SG list length */
 155         }
 156
 157         /* clear wqe header until sglist */
 158         memset(wqe_p, 0, offsetof(struct ehca_wqe, u.ud_av.sg_list));
 159
 160         wqe_p->work_request_id = send_wr->wr_id;
 161
 162         switch (send_wr->opcode) {
 163         case IB_WR_SEND:
 164         case IB_WR_SEND_WITH_IMM:
 165                 wqe_p->optype = WQE_OPTYPE_SEND;
 166                 break;
 167         case IB_WR_RDMA_WRITE:
 168         case IB_WR_RDMA_WRITE_WITH_IMM:
 169                 wqe_p->optype = WQE_OPTYPE_RDMAWRITE;
 170                 break;
 171         case IB_WR_RDMA_READ:
 172                 wqe_p->optype = WQE_OPTYPE_RDMAREAD;
 173                 break;
 174         default:
 175                 ehca_gen_err("Invalid opcode=%x", send_wr->opcode);
 176                 return -EINVAL; /* invalid opcode */
 177         }
 178
 179         wqe_p->wqef = (send_wr->opcode) & WQEF_HIGH_NIBBLE;
 180
 181         wqe_p->wr_flag = 0;
 182
 183         if ((send_wr->send_flags & IB_SEND_SIGNALED ||
 184             qp->init_attr.sq_sig_type == IB_SIGNAL_ALL_WR)
 185             && !hidden)
 186                 wqe_p->wr_flag |= WQE_WRFLAG_REQ_SIGNAL_COM;
 187
 188         if (send_wr->opcode == IB_WR_SEND_WITH_IMM ||
 189             send_wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM) {
 190                 /* this might not work as long as HW does not support it */
 191                 wqe_p->immediate_data = be32_to_cpu(send_wr->ex.imm_data);
 192                 wqe_p->wr_flag |= WQE_WRFLAG_IMM_DATA_PRESENT;
 193         }
 194
 195         wqe_p->nr_of_data_seg = send_wr->num_sge;
 196
 197         switch (qp->qp_type) {
 198         case IB_QPT_SMI:
 199         case IB_QPT_GSI:
 200                 /* no break is intential here */
 201         case IB_QPT_UD:
 202                 /* IB 1.2 spec C10-15 compliance */
 203                 if (send_wr->wr.ud.remote_qkey & 0x80000000)
 204                         remote_qkey = qp->qkey;
 205
 206                 wqe_p->destination_qp_number = send_wr->wr.ud.remote_qpn << 8;
 207                 wqe_p->local_ee_context_qkey = remote_qkey;
 208                 if (unlikely(!send_wr->wr.ud.ah)) {
 209                         ehca_gen_err("wr.ud.ah is NULL. qp=%p", qp);
 210                         return -EINVAL;
 211                 }
 212                 if (unlikely(send_wr->wr.ud.remote_qpn == 0)) {
 213                         ehca_gen_err("dest QP# is 0. qp=%x", qp->real_qp_num);
 214                         return -EINVAL;
 215                 }
 216                 my_av = container_of(send_wr->wr.ud.ah, struct ehca_av, ib_ah);
 217                 wqe_p->u.ud_av.ud_av = my_av->av;
 218
 219                 /*
 220                  * omitted check of IB_SEND_INLINE
 221                  * since HW does not support it
 222                  */
 223                 for (idx = 0; idx < send_wr->num_sge; idx++) {
 224                         wqe_p->u.ud_av.sg_list[idx].vaddr =
 225                                 send_wr->sg_list[idx].addr;
 226                         wqe_p->u.ud_av.sg_list[idx].lkey =
 227                                 send_wr->sg_list[idx].lkey;
 228                         wqe_p->u.ud_av.sg_list[idx].length =
 229                                 send_wr->sg_list[idx].length;
 230                 } /* eof for idx */
 231                 if (qp->qp_type == IB_QPT_SMI ||
 232                     qp->qp_type == IB_QPT_GSI)
 233                         wqe_p->u.ud_av.ud_av.pmtu = 1;
 234                 if (qp->qp_type == IB_QPT_GSI) {
 235                         wqe_p->pkeyi = send_wr->wr.ud.pkey_index;
 236 #ifdef DEBUG_GSI_SEND_WR
 237                         trace_send_wr_ud(send_wr);
 238 #endif /* DEBUG_GSI_SEND_WR */
 239                 }
 240                 break;
 241
 242         case IB_QPT_UC:
 243                 if (send_wr->send_flags & IB_SEND_FENCE)
 244                         wqe_p->wr_flag |= WQE_WRFLAG_FENCE;
 245                 /* no break is intentional here */
 246         case IB_QPT_RC:
 247                 /* TODO: atomic not implemented */
 248                 wqe_p->u.nud.remote_virtual_adress =
 249                         send_wr->wr.rdma.remote_addr;
 250                 wqe_p->u.nud.rkey = send_wr->wr.rdma.rkey;
 251
 252                 /*
 253                  * omitted checking of IB_SEND_INLINE
 254                  * since HW does not support it
 255                  */
 256                 dma_length = 0;
 257                 for (idx = 0; idx < send_wr->num_sge; idx++) {
 258                         wqe_p->u.nud.sg_list[idx].vaddr =
 259                                 send_wr->sg_list[idx].addr;
 260                         wqe_p->u.nud.sg_list[idx].lkey =
 261                                 send_wr->sg_list[idx].lkey;
 262                         wqe_p->u.nud.sg_list[idx].length =
 263                                 send_wr->sg_list[idx].length;
 264                         dma_length += send_wr->sg_list[idx].length;
 265                 } /* eof idx */
 266                 wqe_p->u.nud.atomic_1st_op_dma_len = dma_length;
 267
 268                 /* unsolicited ack circumvention */
 269                 if (send_wr->opcode == IB_WR_RDMA_READ) {
 270                         /* on RDMA read, switch on and reset counters */
 271                         qp->message_count = qp->packet_count = 0;
 272                         qp->unsol_ack_circ = 1;
 273                 } else
 274                         /* else estimate #packets */
 275                         qp->packet_count += (dma_length >> qp->mtu_shift) + 1;
 276
 277                 break;
 278
 279         default:
 280                 ehca_gen_err("Invalid qptype=%x", qp->qp_type);
 281                 return -EINVAL;
 282         }
 283
 284         if (ehca_debug_level >= 3) {
 285                 ehca_gen_dbg("SEND WQE written into queue qp=%p ", qp);
 286                 ehca_dmp( wqe_p, 16*(6 + wqe_p->nr_of_data_seg), "send wqe");
 287         }
 288         return 0;
 289 }
 290
 291 /* map_ib_wc_status converts raw cqe_status to ib_wc_status */
 292 static inline void map_ib_wc_status(u32 cqe_status,
 293                                     enum ib_wc_status *wc_status)
 294 {
 295         if (unlikely(cqe_status & WC_STATUS_ERROR_BIT)) {
 296                 switch (cqe_status & 0x3F) {
 297                 case 0x01:
 298                 case 0x21:
 299                         *wc_status = IB_WC_LOC_LEN_ERR;
 300                         break;
 301                 case 0x02:
 302                 case 0x22:
 303                         *wc_status = IB_WC_LOC_QP_OP_ERR;
 304                         break;
 305                 case 0x03:
 306                 case 0x23:
 307                         *wc_status = IB_WC_LOC_EEC_OP_ERR;
 308                         break;
 309                 case 0x04:
 310                 case 0x24:
 311                         *wc_status = IB_WC_LOC_PROT_ERR;
 312                         break;
 313                 case 0x05:
 314                 case 0x25:
 315                         *wc_status = IB_WC_WR_FLUSH_ERR;
 316                         break;
 317                 case 0x06:
 318                         *wc_status = IB_WC_MW_BIND_ERR;
 319                         break;
 320                 case 0x07: /* remote error - look into bits 20:24 */
 321                         switch ((cqe_status
 322                                  & WC_STATUS_REMOTE_ERROR_FLAGS) >> 11) {
 323                         case 0x0:
 324                                 /*
 325                                  * PSN Sequence Error!
 326                                  * couldn't find a matching status!
 327                                  */
 328                                 *wc_status = IB_WC_GENERAL_ERR;
 329                                 break;
 330                         case 0x1:
 331                                 *wc_status = IB_WC_REM_INV_REQ_ERR;
 332                                 break;
 333                         case 0x2:
 334                                 *wc_status = IB_WC_REM_ACCESS_ERR;
 335                                 break;
 336                         case 0x3:
 337                                 *wc_status = IB_WC_REM_OP_ERR;
 338                                 break;
 339                         case 0x4:
 340                                 *wc_status = IB_WC_REM_INV_RD_REQ_ERR;
 341                                 break;
 342                         }
 343                         break;
 344                 case 0x08:
 345                         *wc_status = IB_WC_RETRY_EXC_ERR;
 346                         break;
 347                 case 0x09:
 348                         *wc_status = IB_WC_RNR_RETRY_EXC_ERR;
 349                         break;
 350                 case 0x0A:
 351                 case 0x2D:
 352                         *wc_status = IB_WC_REM_ABORT_ERR;
 353                         break;
 354                 case 0x0B:
 355                 case 0x2E:
 356                         *wc_status = IB_WC_INV_EECN_ERR;
 357                         break;
 358                 case 0x0C:
 359                 case 0x2F:
 360                         *wc_status = IB_WC_INV_EEC_STATE_ERR;
 361                         break;
 362                 case 0x0D:
 363                         *wc_status = IB_WC_BAD_RESP_ERR;
 364                         break;
 365                 case 0x10:
 366                         /* WQE purged */
 367                         *wc_status = IB_WC_WR_FLUSH_ERR;
 368                         break;
 369                 default:
 370                         *wc_status = IB_WC_FATAL_ERR;
 371
 372                 }
 373         } else
 374                 *wc_status = IB_WC_SUCCESS;
 375 }
 376
 377 static inline int post_one_send(struct ehca_qp *my_qp,
 378                          struct ib_send_wr *cur_send_wr,
 379                          struct ib_send_wr **bad_send_wr,
 380                          int hidden)
 381 {
 382         struct ehca_wqe *wqe_p;
 383         int ret;
 384         u64 start_offset = my_qp->ipz_squeue.current_q_offset;
 385
 386         /* get pointer next to free WQE */
 387         wqe_p = ipz_qeit_get_inc(&my_qp->ipz_squeue);
 388         if (unlikely(!wqe_p)) {
 389                 /* too many posted work requests: queue overflow */
 390                 if (bad_send_wr)
 391                         *bad_send_wr = cur_send_wr;
 392                 ehca_err(my_qp->ib_qp.device, "Too many posted WQEs "
 393                          "qp_num=%x", my_qp->ib_qp.qp_num);
 394                 return -ENOMEM;
 395         }
 396         /* write a SEND WQE into the QUEUE */
 397         ret = ehca_write_swqe(my_qp, wqe_p, cur_send_wr, hidden);
 398         /*
 399          * if something failed,
 400          * reset the free entry pointer to the start value
 401          */
 402         if (unlikely(ret)) {
 403                 my_qp->ipz_squeue.current_q_offset = start_offset;
 404                 if (bad_send_wr)
 405                         *bad_send_wr = cur_send_wr;
 406                 ehca_err(my_qp->ib_qp.device, "Could not write WQE "
 407                          "qp_num=%x", my_qp->ib_qp.qp_num);
 408                 return -EINVAL;
 409         }
 410
 411         return 0;
 412 }
 413
 414 int ehca_post_send(struct ib_qp *qp,
 415                    struct ib_send_wr *send_wr,
 416                    struct ib_send_wr **bad_send_wr)
 417 {
 418         struct ehca_qp *my_qp = container_of(qp, struct ehca_qp, ib_qp);
 419         struct ib_send_wr *cur_send_wr;
 420         int wqe_cnt = 0;
 421         int ret = 0;
 422         unsigned long flags;
 423
 424         /* Reject WR if QP is in RESET, INIT or RTR state */
 425         if (unlikely(my_qp->state < IB_QPS_RTS)) {
 426                 ehca_err(qp->device, "Invalid QP state  qp_state=%d qpn=%x",
 427                          my_qp->state, qp->qp_num);
 428                 return -EINVAL;
 429         }
 430
 431         /* LOCK the QUEUE */
 432         spin_lock_irqsave(&my_qp->spinlock_s, flags);
 433
 434         /* Send an empty extra RDMA read if:
 435          *  1) there has been an RDMA read on this connection before
 436          *  2) no RDMA read occurred for ACK_CIRC_THRESHOLD link packets
 437          *  3) we can be sure that any previous extra RDMA read has been
 438          *     processed so we don't overflow the SQ
 439          */
 440         if (unlikely(my_qp->unsol_ack_circ &&
 441                      my_qp->packet_count > ACK_CIRC_THRESHOLD &&
 442                      my_qp->message_count > my_qp->init_attr.cap.max_send_wr)) {
 443                 /* insert an empty RDMA READ to fix up the remote QP state */
 444                 struct ib_send_wr circ_wr;
 445                 memset(&circ_wr, 0, sizeof(circ_wr));
 446                 circ_wr.opcode = IB_WR_RDMA_READ;
 447                 post_one_send(my_qp, &circ_wr, NULL, 1); /* ignore retcode */
 448                 wqe_cnt++;
 449                 ehca_dbg(qp->device, "posted circ wr  qp_num=%x", qp->qp_num);
 450                 my_qp->message_count = my_qp->packet_count = 0;
 451         }
 452
 453         /* loop processes list of send reqs */
 454         for (cur_send_wr = send_wr; cur_send_wr != NULL;
 455              cur_send_wr = cur_send_wr->next) {
 456                 ret = post_one_send(my_qp, cur_send_wr, bad_send_wr, 0);
 457                 if (unlikely(ret)) {
 458                         /* if one or more WQEs were successful, don't fail */
 459                         if (wqe_cnt)
 460                                 ret = 0;
 461                         goto post_send_exit0;
 462                 }
 463                 wqe_cnt++;
 464         } /* eof for cur_send_wr */
 465
 466 post_send_exit0:
 467         iosync(); /* serialize GAL register access */
 468         hipz_update_sqa(my_qp, wqe_cnt);
 469         if (unlikely(ret || ehca_debug_level >= 2))
 470                 ehca_dbg(qp->device, "ehca_qp=%p qp_num=%x wqe_cnt=%d ret=%i",
 471                          my_qp, qp->qp_num, wqe_cnt, ret);
 472         my_qp->message_count += wqe_cnt;
 473         spin_unlock_irqrestore(&my_qp->spinlock_s, flags);
 474         return ret;
 475 }
 476
 477 static int internal_post_recv(struct ehca_qp *my_qp,
 478                               struct ib_device *dev,
 479                               struct ib_recv_wr *recv_wr,
 480                               struct ib_recv_wr **bad_recv_wr)
 481 {
 482         struct ib_recv_wr *cur_recv_wr;
 483         struct ehca_wqe *wqe_p;
 484         int wqe_cnt = 0;
 485         int ret = 0;
 486         unsigned long flags;
 487
 488         if (unlikely(!HAS_RQ(my_qp))) {
 489                 ehca_err(dev, "QP has no RQ  ehca_qp=%p qp_num=%x ext_type=%d",
 490                          my_qp, my_qp->real_qp_num, my_qp->ext_type);
 491                 return -ENODEV;
 492         }
 493
 494         /* LOCK the QUEUE */
 495         spin_lock_irqsave(&my_qp->spinlock_r, flags);
 496
 497         /* loop processes list of send reqs */
 498         for (cur_recv_wr = recv_wr; cur_recv_wr != NULL;
 499              cur_recv_wr = cur_recv_wr->next) {
 500                 u64 start_offset = my_qp->ipz_rqueue.current_q_offset;
 501                 /* get pointer next to free WQE */
 502                 wqe_p = ipz_qeit_get_inc(&my_qp->ipz_rqueue);
 503                 if (unlikely(!wqe_p)) {
 504                         /* too many posted work requests: queue overflow */
 505                         if (bad_recv_wr)
 506                                 *bad_recv_wr = cur_recv_wr;
 507                         if (wqe_cnt == 0) {
 508                                 ret = -ENOMEM;
 509                                 ehca_err(dev, "Too many posted WQEs "
 510                                          "qp_num=%x", my_qp->real_qp_num);
 511                         }
 512                         goto post_recv_exit0;
 513                 }
 514                 /* write a RECV WQE into the QUEUE */
 515                 ret = ehca_write_rwqe(&my_qp->ipz_rqueue, wqe_p, cur_recv_wr);
 516                 /*
 517                  * if something failed,
 518                  * reset the free entry pointer to the start value
 519                  */
 520                 if (unlikely(ret)) {
 521                         my_qp->ipz_rqueue.current_q_offset = start_offset;
 522                         *bad_recv_wr = cur_recv_wr;
 523                         if (wqe_cnt == 0) {
 524                                 ret = -EINVAL;
 525                                 ehca_err(dev, "Could not write WQE "
 526                                          "qp_num=%x", my_qp->real_qp_num);
 527                         }
 528                         goto post_recv_exit0;
 529                 }
 530                 wqe_cnt++;
 531         } /* eof for cur_recv_wr */
 532
 533 post_recv_exit0:
 534         iosync(); /* serialize GAL register access */
 535         hipz_update_rqa(my_qp, wqe_cnt);
 536         if (unlikely(ret || ehca_debug_level >= 2))
 537             ehca_dbg(dev, "ehca_qp=%p qp_num=%x wqe_cnt=%d ret=%i",
 538                      my_qp, my_qp->real_qp_num, wqe_cnt, ret);
 539         spin_unlock_irqrestore(&my_qp->spinlock_r, flags);
 540         return ret;
 541 }
 542
 543 int ehca_post_recv(struct ib_qp *qp,
 544                    struct ib_recv_wr *recv_wr,
 545                    struct ib_recv_wr **bad_recv_wr)
 546 {
 547         return internal_post_recv(container_of(qp, struct ehca_qp, ib_qp),
 548                                   qp->device, recv_wr, bad_recv_wr);
 549 }
 550
 551 int ehca_post_srq_recv(struct ib_srq *srq,
 552                        struct ib_recv_wr *recv_wr,
 553                        struct ib_recv_wr **bad_recv_wr)
 554 {
 555         return internal_post_recv(container_of(srq, struct ehca_qp, ib_srq),
 556                                   srq->device, recv_wr, bad_recv_wr);
 557 }
 558
 559 /*
 560  * ib_wc_opcode table converts ehca wc opcode to ib
 561  * Since we use zero to indicate invalid opcode, the actual ib opcode must
 562  * be decremented!!!
 563  */
 564 static const u8 ib_wc_opcode[255] = {
 565         [0x01] = IB_WC_RECV+1,
 566         [0x02] = IB_WC_RECV_RDMA_WITH_IMM+1,
 567         [0x04] = IB_WC_BIND_MW+1,
 568         [0x08] = IB_WC_FETCH_ADD+1,
 569         [0x10] = IB_WC_COMP_SWAP+1,
 570         [0x20] = IB_WC_RDMA_WRITE+1,
 571         [0x40] = IB_WC_RDMA_READ+1,
 572         [0x80] = IB_WC_SEND+1
 573 };
 574
 575 /* internal function to poll one entry of cq */
 576 static inline int ehca_poll_cq_one(struct ib_cq *cq, struct ib_wc *wc)
 577 {
 578         int ret = 0;
 579         struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
 580         struct ehca_cqe *cqe;
 581         struct ehca_qp *my_qp;
 582         int cqe_count = 0, is_error;
 583
 584 poll_cq_one_read_cqe:
 585         cqe = (struct ehca_cqe *)
 586                 ipz_qeit_get_inc_valid(&my_cq->ipz_queue);
 587         if (!cqe) {
 588                 ret = -EAGAIN;
 589                 if (ehca_debug_level >= 3)
 590                         ehca_dbg(cq->device, "Completion queue is empty  "
 591                                  "my_cq=%p cq_num=%x", my_cq, my_cq->cq_number);
 592                 goto poll_cq_one_exit0;
 593         }
 594
 595         /* prevents loads being reordered across this point */
 596         rmb();
 597
 598         cqe_count++;
 599         if (unlikely(cqe->status & WC_STATUS_PURGE_BIT)) {
 600                 struct ehca_qp *qp;
 601                 int purgeflag;
 602                 unsigned long flags;
 603
 604                 qp = ehca_cq_get_qp(my_cq, cqe->local_qp_number);
 605                 if (!qp) {
 606                         ehca_err(cq->device, "cq_num=%x qp_num=%x "
 607                                  "could not find qp -> ignore cqe",
 608                                  my_cq->cq_number, cqe->local_qp_number);
 609                         ehca_dmp(cqe, 64, "cq_num=%x qp_num=%x",
 610                                  my_cq->cq_number, cqe->local_qp_number);
 611                         /* ignore this purged cqe */
 612                         goto poll_cq_one_read_cqe;
 613                 }
 614                 spin_lock_irqsave(&qp->spinlock_s, flags);
 615                 purgeflag = qp->sqerr_purgeflag;
 616                 spin_unlock_irqrestore(&qp->spinlock_s, flags);
 617
 618                 if (purgeflag) {
 619                         ehca_dbg(cq->device,
 620                                  "Got CQE with purged bit qp_num=%x src_qp=%x",
 621                                  cqe->local_qp_number, cqe->remote_qp_number);
 622                         if (ehca_debug_level >= 2)
 623                                 ehca_dmp(cqe, 64, "qp_num=%x src_qp=%x",
 624                                          cqe->local_qp_number,
 625                                          cqe->remote_qp_number);
 626                         /*
 627                          * ignore this to avoid double cqes of bad wqe
 628                          * that caused sqe and turn off purge flag
 629                          */
 630                         qp->sqerr_purgeflag = 0;
 631                         goto poll_cq_one_read_cqe;
 632                 }
 633         }
 634
 635         is_error = cqe->status & WC_STATUS_ERROR_BIT;
 636
 637         /* trace error CQEs if debug_level >= 1, trace all CQEs if >= 3 */
 638         if (unlikely(ehca_debug_level >= 3 || (ehca_debug_level && is_error))) {
 639                 ehca_dbg(cq->device,
 640                          "Received %sCOMPLETION ehca_cq=%p cq_num=%x -----",
 641                          is_error ? "ERROR " : "", my_cq, my_cq->cq_number);
 642                 ehca_dmp(cqe, 64, "ehca_cq=%p cq_num=%x",
 643                          my_cq, my_cq->cq_number);
 644                 ehca_dbg(cq->device,
 645                          "ehca_cq=%p cq_num=%x -------------------------",
 646                          my_cq, my_cq->cq_number);
 647         }
 648
 649         /* we got a completion! */
 650         wc->wr_id = cqe->work_request_id;
 651
 652         /* eval ib_wc_opcode */
 653         wc->opcode = ib_wc_opcode[cqe->optype]-1;
 654         if (unlikely(wc->opcode == -1)) {
 655                 ehca_err(cq->device, "Invalid cqe->OPType=%x cqe->status=%x "
 656                          "ehca_cq=%p cq_num=%x",
 657                          cqe->optype, cqe->status, my_cq, my_cq->cq_number);
 658                 /* dump cqe for other infos */
 659                 ehca_dmp(cqe, 64, "ehca_cq=%p cq_num=%x",
 660                          my_cq, my_cq->cq_number);
 661                 /* update also queue adder to throw away this entry!!! */
 662                 goto poll_cq_one_exit0;
 663         }
 664
 665         /* eval ib_wc_status */
 666         if (unlikely(is_error)) {
 667                 /* complete with errors */
 668                 map_ib_wc_status(cqe->status, &wc->status);
 669                 wc->vendor_err = wc->status;
 670         } else
 671                 wc->status = IB_WC_SUCCESS;
 672
 673         read_lock(&ehca_qp_idr_lock);
 674         my_qp = idr_find(&ehca_qp_idr, cqe->qp_token);
 675         wc->qp = &my_qp->ib_qp;
 676         read_unlock(&ehca_qp_idr_lock);
 677
 678         wc->byte_len = cqe->nr_bytes_transferred;
 679         wc->pkey_index = cqe->pkey_index;
 680         wc->slid = cqe->rlid;
 681         wc->dlid_path_bits = cqe->dlid;
 682         wc->src_qp = cqe->remote_qp_number;
 683         wc->wc_flags = cqe->w_completion_flags;
 684         wc->ex.imm_data = cpu_to_be32(cqe->immediate_data);
 685         wc->sl = cqe->service_level;
 686
 687 poll_cq_one_exit0:
 688         if (cqe_count > 0)
 689                 hipz_update_feca(my_cq, cqe_count);
 690
 691         return ret;
 692 }
 693
 694 int ehca_poll_cq(struct ib_cq *cq, int num_entries, struct ib_wc *wc)
 695 {
 696         struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
 697         int nr;
 698         struct ib_wc *current_wc = wc;
 699         int ret = 0;
 700         unsigned long flags;
 701
 702         if (num_entries < 1) {
 703                 ehca_err(cq->device, "Invalid num_entries=%d ehca_cq=%p "
 704                          "cq_num=%x", num_entries, my_cq, my_cq->cq_number);
 705                 ret = -EINVAL;
 706                 goto poll_cq_exit0;
 707         }
 708
 709         spin_lock_irqsave(&my_cq->spinlock, flags);
 710         for (nr = 0; nr < num_entries; nr++) {
 711                 ret = ehca_poll_cq_one(cq, current_wc);
 712                 if (ret)
 713                         break;
 714                 current_wc++;
 715         } /* eof for nr */
 716         spin_unlock_irqrestore(&my_cq->spinlock, flags);
 717         if (ret == -EAGAIN  || !ret)
 718                 ret = nr;
 719
 720 poll_cq_exit0:
 721         return ret;
 722 }
 723
 724 int ehca_req_notify_cq(struct ib_cq *cq, enum ib_cq_notify_flags notify_flags)
 725 {
 726         struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
 727         int ret = 0;
 728
 729         switch (notify_flags & IB_CQ_SOLICITED_MASK) {
 730         case IB_CQ_SOLICITED:
 731                 hipz_set_cqx_n0(my_cq, 1);
 732                 break;
 733         case IB_CQ_NEXT_COMP:
 734                 hipz_set_cqx_n1(my_cq, 1);
 735                 break;
 736         default:
 737                 return -EINVAL;
 738         }
 739
 740         if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
 741                 unsigned long spl_flags;
 742                 spin_lock_irqsave(&my_cq->spinlock, spl_flags);
 743                 ret = ipz_qeit_is_valid(&my_cq->ipz_queue);
 744                 spin_unlock_irqrestore(&my_cq->spinlock, spl_flags);
 745         }
 746
 747         return ret;
 748 }