contrib/ofed/libcxgb4/cq.c

   1 /*
   2  * Copyright (c) 2006-2016 Chelsio, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32 #include <config.h>
  33
  34 #include <stdio.h>
  35 #include <syslog.h>
  36 #include <pthread.h>
  37 #include <sys/errno.h>
  38 #include <infiniband/opcode.h>
  39 #include "libcxgb4.h"
  40 #include "cxgb4-abi.h"
  41
  42 static void insert_recv_cqe(struct t4_wq *wq, struct t4_cq *cq)
  43 {
  44         struct t4_cqe cqe;
  45
  46         PDBG("%s wq %p cq %p sw_cidx %u sw_pidx %u\n", __func__,
  47              wq, cq, cq->sw_cidx, cq->sw_pidx);
  48         memset(&cqe, 0, sizeof(cqe));
  49         cqe.header = htobe32(V_CQE_STATUS(T4_ERR_SWFLUSH) |
  50                                  V_CQE_OPCODE(FW_RI_SEND) |
  51                                  V_CQE_TYPE(0) |
  52                                  V_CQE_SWCQE(1) |
  53                                  V_CQE_QPID(wq->sq.qid));
  54         cqe.bits_type_ts = htobe64(V_CQE_GENBIT((u64)cq->gen));
  55         cq->sw_queue[cq->sw_pidx] = cqe;
  56         t4_swcq_produce(cq);
  57 }
  58
  59 int c4iw_flush_rq(struct t4_wq *wq, struct t4_cq *cq, int count)
  60 {
  61         int flushed = 0;
  62         int in_use = wq->rq.in_use - count;
  63
  64         BUG_ON(in_use < 0);
  65         PDBG("%s wq %p cq %p rq.in_use %u skip count %u\n", __func__,
  66              wq, cq, wq->rq.in_use, count);
  67         while (in_use--) {
  68                 insert_recv_cqe(wq, cq);
  69                 flushed++;
  70         }
  71         return flushed;
  72 }
  73
  74 static void insert_sq_cqe(struct t4_wq *wq, struct t4_cq *cq,
  75                           struct t4_swsqe *swcqe)
  76 {
  77         struct t4_cqe cqe;
  78
  79         PDBG("%s wq %p cq %p sw_cidx %u sw_pidx %u\n", __func__,
  80              wq, cq, cq->sw_cidx, cq->sw_pidx);
  81         memset(&cqe, 0, sizeof(cqe));
  82         cqe.header = htobe32(V_CQE_STATUS(T4_ERR_SWFLUSH) |
  83                                  V_CQE_OPCODE(swcqe->opcode) |
  84                                  V_CQE_TYPE(1) |
  85                                  V_CQE_SWCQE(1) |
  86                                  V_CQE_QPID(wq->sq.qid));
  87         CQE_WRID_SQ_IDX(&cqe) = swcqe->idx;
  88         cqe.bits_type_ts = htobe64(V_CQE_GENBIT((u64)cq->gen));
  89         cq->sw_queue[cq->sw_pidx] = cqe;
  90         t4_swcq_produce(cq);
  91 }
  92
  93 static void advance_oldest_read(struct t4_wq *wq);
  94
  95 void c4iw_flush_sq(struct c4iw_qp *qhp)
  96 {
  97         unsigned short flushed = 0;
  98         struct t4_wq *wq = &qhp->wq;
  99         struct c4iw_cq *chp = to_c4iw_cq(qhp->ibv_qp.send_cq);
 100         struct t4_cq *cq = &chp->cq;
 101         int idx;
 102         struct t4_swsqe *swsqe;
 103
 104         if (wq->sq.flush_cidx == -1)
 105                 wq->sq.flush_cidx = wq->sq.cidx;
 106         idx = wq->sq.flush_cidx;
 107         BUG_ON(idx >= wq->sq.size);
 108         while (idx != wq->sq.pidx) {
 109                 swsqe = &wq->sq.sw_sq[idx];
 110                 BUG_ON(swsqe->flushed);
 111                 swsqe->flushed = 1;
 112                 insert_sq_cqe(wq, cq, swsqe);
 113                 if (wq->sq.oldest_read == swsqe) {
 114                         BUG_ON(swsqe->opcode != FW_RI_READ_REQ);
 115                         advance_oldest_read(wq);
 116                 }
 117                 flushed++;
 118                 if (++idx == wq->sq.size)
 119                         idx = 0;
 120         }
 121         wq->sq.flush_cidx += flushed;
 122         if (wq->sq.flush_cidx >= wq->sq.size)
 123                 wq->sq.flush_cidx -= wq->sq.size;
 124 }
 125
 126 static void flush_completed_wrs(struct t4_wq *wq, struct t4_cq *cq)
 127 {
 128         struct t4_swsqe *swsqe;
 129         unsigned short cidx;
 130
 131         if (wq->sq.flush_cidx == -1)
 132                 wq->sq.flush_cidx = wq->sq.cidx;
 133         cidx = wq->sq.flush_cidx;
 134         BUG_ON(cidx >= wq->sq.size);
 135
 136         while (cidx != wq->sq.pidx) {
 137                 swsqe = &wq->sq.sw_sq[cidx];
 138                 if (!swsqe->signaled) {
 139                         if (++cidx == wq->sq.size)
 140                                 cidx = 0;
 141                 } else if (swsqe->complete) {
 142
 143                         BUG_ON(swsqe->flushed);
 144
 145                         /*
 146                          * Insert this completed cqe into the swcq.
 147                          */
 148                         PDBG("%s moving cqe into swcq sq idx %u cq idx %u\n",
 149                              __func__, cidx, cq->sw_pidx);
 150
 151                         swsqe->cqe.header |= htobe32(V_CQE_SWCQE(1));
 152                         cq->sw_queue[cq->sw_pidx] = swsqe->cqe;
 153                         t4_swcq_produce(cq);
 154                         swsqe->flushed = 1;
 155                         if (++cidx == wq->sq.size)
 156                                 cidx = 0;
 157                         wq->sq.flush_cidx = cidx;
 158                 } else
 159                         break;
 160         }
 161 }
 162
 163 static void create_read_req_cqe(struct t4_wq *wq, struct t4_cqe *hw_cqe,
 164                                 struct t4_cqe *read_cqe)
 165 {
 166         read_cqe->u.scqe.cidx = wq->sq.oldest_read->idx;
 167         read_cqe->len = be32toh(wq->sq.oldest_read->read_len);
 168         read_cqe->header = htobe32(V_CQE_QPID(CQE_QPID(hw_cqe)) |
 169                                  V_CQE_SWCQE(SW_CQE(hw_cqe)) |
 170                                  V_CQE_OPCODE(FW_RI_READ_REQ) |
 171                                  V_CQE_TYPE(1));
 172         read_cqe->bits_type_ts = hw_cqe->bits_type_ts;
 173 }
 174
 175 static void advance_oldest_read(struct t4_wq *wq)
 176 {
 177
 178         u32 rptr = wq->sq.oldest_read - wq->sq.sw_sq + 1;
 179
 180         if (rptr == wq->sq.size)
 181                 rptr = 0;
 182         while (rptr != wq->sq.pidx) {
 183                 wq->sq.oldest_read = &wq->sq.sw_sq[rptr];
 184
 185                 if (wq->sq.oldest_read->opcode == FW_RI_READ_REQ)
 186                         return;
 187                 if (++rptr == wq->sq.size)
 188                         rptr = 0;
 189         }
 190         wq->sq.oldest_read = NULL;
 191 }
 192
 193 /*
 194  * Move all CQEs from the HWCQ into the SWCQ.
 195  * Deal with out-of-order and/or completions that complete
 196  * prior unsignalled WRs.
 197  */
 198 void c4iw_flush_hw_cq(struct c4iw_cq *chp)
 199 {
 200         struct t4_cqe *hw_cqe, *swcqe, read_cqe;
 201         struct c4iw_qp *qhp;
 202         struct t4_swsqe *swsqe;
 203         int ret;
 204
 205         PDBG("%s  cqid 0x%x\n", __func__, chp->cq.cqid);
 206         ret = t4_next_hw_cqe(&chp->cq, &hw_cqe);
 207
 208         /*
 209          * This logic is similar to poll_cq(), but not quite the same
 210          * unfortunately.  Need to move pertinent HW CQEs to the SW CQ but
 211          * also do any translation magic that poll_cq() normally does.
 212          */
 213         while (!ret) {
 214                 qhp = get_qhp(chp->rhp, CQE_QPID(hw_cqe));
 215
 216                 /*
 217                  * drop CQEs with no associated QP
 218                  */
 219                 if (qhp == NULL)
 220                         goto next_cqe;
 221
 222                 if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE)
 223                         goto next_cqe;
 224
 225                 if (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP) {
 226
 227                         /*
 228                          * If we have reached here because of async
 229                          * event or other error, and have egress error
 230                          * then drop
 231                          */
 232                         if (CQE_TYPE(hw_cqe) == 1) {
 233                                 syslog(LOG_CRIT, "%s: got egress error in \
 234                                         read-response, dropping!\n", __func__);
 235                                 goto next_cqe;
 236                         }
 237
 238                         /*
 239                          * drop peer2peer RTR reads.
 240                          */
 241                         if (CQE_WRID_STAG(hw_cqe) == 1)
 242                                 goto next_cqe;
 243
 244                         /*
 245                          * Eat completions for unsignaled read WRs.
 246                          */
 247                         if (!qhp->wq.sq.oldest_read->signaled) {
 248                                 advance_oldest_read(&qhp->wq);
 249                                 goto next_cqe;
 250                         }
 251
 252                         /*
 253                          * Don't write to the HWCQ, create a new read req CQE
 254                          * in local memory and move it into the swcq.
 255                          */
 256                         create_read_req_cqe(&qhp->wq, hw_cqe, &read_cqe);
 257                         hw_cqe = &read_cqe;
 258                         advance_oldest_read(&qhp->wq);
 259                 }
 260
 261                 /* if its a SQ completion, then do the magic to move all the
 262                  * unsignaled and now in-order completions into the swcq.
 263                  */
 264                 if (SQ_TYPE(hw_cqe)) {
 265                         int idx = CQE_WRID_SQ_IDX(hw_cqe);
 266
 267                         BUG_ON(idx >= qhp->wq.sq.size);
 268                         swsqe = &qhp->wq.sq.sw_sq[idx];
 269                         swsqe->cqe = *hw_cqe;
 270                         swsqe->complete = 1;
 271                         flush_completed_wrs(&qhp->wq, &chp->cq);
 272                 } else {
 273                         swcqe = &chp->cq.sw_queue[chp->cq.sw_pidx];
 274                         *swcqe = *hw_cqe;
 275                         swcqe->header |= htobe32(V_CQE_SWCQE(1));
 276                         t4_swcq_produce(&chp->cq);
 277                 }
 278 next_cqe:
 279                 t4_hwcq_consume(&chp->cq);
 280                 ret = t4_next_hw_cqe(&chp->cq, &hw_cqe);
 281         }
 282 }
 283
 284 static int cqe_completes_wr(struct t4_cqe *cqe, struct t4_wq *wq)
 285 {
 286         if (CQE_OPCODE(cqe) == FW_RI_TERMINATE)
 287                 return 0;
 288
 289         if ((CQE_OPCODE(cqe) == FW_RI_RDMA_WRITE) && RQ_TYPE(cqe))
 290                 return 0;
 291
 292         if ((CQE_OPCODE(cqe) == FW_RI_READ_RESP) && SQ_TYPE(cqe))
 293                 return 0;
 294
 295         if (CQE_SEND_OPCODE(cqe) && RQ_TYPE(cqe) && t4_rq_empty(wq))
 296                 return 0;
 297         return 1;
 298 }
 299
 300 void c4iw_count_rcqes(struct t4_cq *cq, struct t4_wq *wq, int *count)
 301 {
 302         struct t4_cqe *cqe;
 303         u32 ptr;
 304
 305         *count = 0;
 306         ptr = cq->sw_cidx;
 307         BUG_ON(ptr >= cq->size);
 308         while (ptr != cq->sw_pidx) {
 309                 cqe = &cq->sw_queue[ptr];
 310                 if (RQ_TYPE(cqe) && (CQE_OPCODE(cqe) != FW_RI_READ_RESP) &&
 311                     (CQE_QPID(cqe) == wq->sq.qid) && cqe_completes_wr(cqe, wq))
 312                         (*count)++;
 313                 if (++ptr == cq->size)
 314                         ptr = 0;
 315         }
 316         PDBG("%s cq %p count %d\n", __func__, cq, *count);
 317 }
 318
 319 static void dump_cqe(void *arg)
 320 {
 321         u64 *p = arg;
 322         syslog(LOG_NOTICE, "cxgb4 err cqe %016llx %016llx %016llx %016llx\n",
 323                (long long)be64toh(p[0]),
 324                (long long)be64toh(p[1]),
 325                (long long)be64toh(p[2]),
 326                (long long)be64toh(p[3]));
 327 }
 328
 329 /*
 330  * poll_cq
 331  *
 332  * Caller must:
 333  *     check the validity of the first CQE,
 334  *     supply the wq assicated with the qpid.
 335  *
 336  * credit: cq credit to return to sge.
 337  * cqe_flushed: 1 iff the CQE is flushed.
 338  * cqe: copy of the polled CQE.
 339  *
 340  * return value:
 341  *    0             CQE returned ok.
 342  *    -EAGAIN       CQE skipped, try again.
 343  *    -EOVERFLOW    CQ overflow detected.
 344  */
 345 static int poll_cq(struct t4_wq *wq, struct t4_cq *cq, struct t4_cqe *cqe,
 346                    u8 *cqe_flushed, u64 *cookie, u32 *credit)
 347 {
 348         int ret = 0;
 349         struct t4_cqe *hw_cqe, read_cqe;
 350
 351         *cqe_flushed = 0;
 352         *credit = 0;
 353
 354         ret = t4_next_cqe(cq, &hw_cqe);
 355         if (ret)
 356                 return ret;
 357
 358         PDBG("%s CQE OVF %u qpid 0x%0x genbit %u type %u status 0x%0x"
 359              " opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
 360              __func__, CQE_OVFBIT(hw_cqe), CQE_QPID(hw_cqe),
 361              CQE_GENBIT(hw_cqe), CQE_TYPE(hw_cqe), CQE_STATUS(hw_cqe),
 362              CQE_OPCODE(hw_cqe), CQE_LEN(hw_cqe), CQE_WRID_HI(hw_cqe),
 363              CQE_WRID_LOW(hw_cqe));
 364
 365         /*
 366          * skip cqe's not affiliated with a QP.
 367          */
 368         if (wq == NULL) {
 369                 ret = -EAGAIN;
 370                 goto skip_cqe;
 371         }
 372
 373         /*
 374          * Gotta tweak READ completions:
 375          *      1) the cqe doesn't contain the sq_wptr from the wr.
 376          *      2) opcode not reflected from the wr.
 377          *      3) read_len not reflected from the wr.
 378          *      4) T4 HW (for now) inserts target read response failures which
 379          *         need to be skipped.
 380          */
 381         if (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP) {
 382
 383                 /*
 384                  * If we have reached here because of async
 385                  * event or other error, and have egress error
 386                  * then drop
 387                  */
 388                 if (CQE_TYPE(hw_cqe) == 1) {
 389                         syslog(LOG_CRIT, "%s: got egress error in \
 390                                 read-response, dropping!\n", __func__);
 391                         if (CQE_STATUS(hw_cqe))
 392                                 t4_set_wq_in_error(wq);
 393                         ret = -EAGAIN;
 394                         goto skip_cqe;
 395                 }
 396
 397                 /*
 398                  * If this is an unsolicited read response, then the read
 399                  * was generated by the kernel driver as part of peer-2-peer
 400                  * connection setup, or a target read response failure.
 401                  * So skip the completion.
 402                  */
 403                 if (CQE_WRID_STAG(hw_cqe) == 1) {
 404                         if (CQE_STATUS(hw_cqe))
 405                                 t4_set_wq_in_error(wq);
 406                         ret = -EAGAIN;
 407                         goto skip_cqe;
 408                 }
 409
 410                 /*
 411                  * Eat completions for unsignaled read WRs.
 412                  */
 413                 if (!wq->sq.oldest_read->signaled) {
 414                         advance_oldest_read(wq);
 415                         ret = -EAGAIN;
 416                         goto skip_cqe;
 417                 }
 418
 419                 /*
 420                  * Don't write to the HWCQ, so create a new read req CQE
 421                  * in local memory.
 422                  */
 423                 create_read_req_cqe(wq, hw_cqe, &read_cqe);
 424                 hw_cqe = &read_cqe;
 425                 advance_oldest_read(wq);
 426         }
 427
 428         if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE) {
 429                 ret = -EAGAIN;
 430                 goto skip_cqe;
 431         }
 432
 433         if (CQE_STATUS(hw_cqe) || t4_wq_in_error(wq)) {
 434                 *cqe_flushed = (CQE_STATUS(hw_cqe) == T4_ERR_SWFLUSH);
 435                 wq->error = 1;
 436
 437                 if (!*cqe_flushed && CQE_STATUS(hw_cqe))
 438                         dump_cqe(hw_cqe);
 439
 440                 BUG_ON((cqe_flushed == 0) && !SW_CQE(hw_cqe));
 441                 goto proc_cqe;
 442         }
 443
 444         /*
 445          * RECV completion.
 446          */
 447         if (RQ_TYPE(hw_cqe)) {
 448
 449                 /*
 450                  * HW only validates 4 bits of MSN.  So we must validate that
 451                  * the MSN in the SEND is the next expected MSN.  If its not,
 452                  * then we complete this with T4_ERR_MSN and mark the wq in
 453                  * error.
 454                  */
 455
 456                 if (t4_rq_empty(wq)) {
 457                         t4_set_wq_in_error(wq);
 458                         ret = -EAGAIN;
 459                         goto skip_cqe;
 460                 }
 461                 if (unlikely((CQE_WRID_MSN(hw_cqe) != (wq->rq.msn)))) {
 462                         t4_set_wq_in_error(wq);
 463                         hw_cqe->header |= htobe32(V_CQE_STATUS(T4_ERR_MSN));
 464                         goto proc_cqe;
 465                 }
 466                 goto proc_cqe;
 467         }
 468
 469         /*
 470          * If we get here its a send completion.
 471          *
 472          * Handle out of order completion. These get stuffed
 473          * in the SW SQ. Then the SW SQ is walked to move any
 474          * now in-order completions into the SW CQ.  This handles
 475          * 2 cases:
 476          *      1) reaping unsignaled WRs when the first subsequent
 477          *         signaled WR is completed.
 478          *      2) out of order read completions.
 479          */
 480         if (!SW_CQE(hw_cqe) && (CQE_WRID_SQ_IDX(hw_cqe) != wq->sq.cidx)) {
 481                 struct t4_swsqe *swsqe;
 482                 int idx =  CQE_WRID_SQ_IDX(hw_cqe);
 483
 484                 PDBG("%s out of order completion going in sw_sq at idx %u\n",
 485                      __func__, idx);
 486                 BUG_ON(idx >= wq->sq.size);
 487                 swsqe = &wq->sq.sw_sq[idx];
 488                 swsqe->cqe = *hw_cqe;
 489                 swsqe->complete = 1;
 490                 ret = -EAGAIN;
 491                 goto flush_wq;
 492         }
 493
 494 proc_cqe:
 495         *cqe = *hw_cqe;
 496
 497         /*
 498          * Reap the associated WR(s) that are freed up with this
 499          * completion.
 500          */
 501         if (SQ_TYPE(hw_cqe)) {
 502                 int idx = CQE_WRID_SQ_IDX(hw_cqe);
 503                 BUG_ON(idx >= wq->sq.size);
 504
 505                 /*
 506                  * Account for any unsignaled completions completed by
 507                  * this signaled completion.  In this case, cidx points
 508                  * to the first unsignaled one, and idx points to the
 509                  * signaled one.  So adjust in_use based on this delta.
 510                  * if this is not completing any unsigned wrs, then the
 511                  * delta will be 0. Handle wrapping also!
 512                  */
 513                 if (idx < wq->sq.cidx)
 514                         wq->sq.in_use -= wq->sq.size + idx - wq->sq.cidx;
 515                 else
 516                         wq->sq.in_use -= idx - wq->sq.cidx;
 517                 BUG_ON(wq->sq.in_use <= 0 || wq->sq.in_use >= wq->sq.size);
 518
 519                 wq->sq.cidx = (u16)idx;
 520                 PDBG("%s completing sq idx %u\n", __func__, wq->sq.cidx);
 521                 *cookie = wq->sq.sw_sq[wq->sq.cidx].wr_id;
 522                 t4_sq_consume(wq);
 523         } else {
 524                 PDBG("%s completing rq idx %u\n", __func__, wq->rq.cidx);
 525                 BUG_ON(wq->rq.cidx >= wq->rq.size);
 526                 *cookie = wq->rq.sw_rq[wq->rq.cidx].wr_id;
 527                 BUG_ON(t4_rq_empty(wq));
 528                 t4_rq_consume(wq);
 529                 goto skip_cqe;
 530         }
 531
 532 flush_wq:
 533         /*
 534          * Flush any completed cqes that are now in-order.
 535          */
 536         flush_completed_wrs(wq, cq);
 537
 538 skip_cqe:
 539         if (SW_CQE(hw_cqe)) {
 540                 PDBG("%s cq %p cqid 0x%x skip sw cqe cidx %u\n",
 541                      __func__, cq, cq->cqid, cq->sw_cidx);
 542                 t4_swcq_consume(cq);
 543         } else {
 544                 PDBG("%s cq %p cqid 0x%x skip hw cqe cidx %u\n",
 545                      __func__, cq, cq->cqid, cq->cidx);
 546                 t4_hwcq_consume(cq);
 547         }
 548         return ret;
 549 }
 550
 551 /*
 552  * Get one cq entry from c4iw and map it to openib.
 553  *
 554  * Returns:
 555  *      0                       cqe returned
 556  *      -ENODATA                EMPTY;
 557  *      -EAGAIN                 caller must try again
 558  *      any other -errno        fatal error
 559  */
 560 static int c4iw_poll_cq_one(struct c4iw_cq *chp, struct ibv_wc *wc)
 561 {
 562         struct c4iw_qp *qhp = NULL;
 563         struct t4_cqe cqe, *rd_cqe;
 564         struct t4_wq *wq;
 565         u32 credit = 0;
 566         u8 cqe_flushed;
 567         u64 cookie = 0;
 568         int ret;
 569
 570         ret = t4_next_cqe(&chp->cq, &rd_cqe);
 571
 572         if (ret) {
 573 #ifdef STALL_DETECTION
 574                 if (ret == -ENODATA && stall_to && !chp->dumped) {
 575                         struct timeval t;
 576
 577                         gettimeofday(&t, NULL);
 578                         if ((t.tv_sec - chp->time.tv_sec) > stall_to) {
 579                                 dump_state();
 580                                 chp->dumped = 1;
 581                         }
 582                 }
 583 #endif
 584                 return ret;
 585         }
 586
 587 #ifdef STALL_DETECTION
 588         gettimeofday(&chp->time, NULL);
 589 #endif
 590
 591         qhp = get_qhp(chp->rhp, CQE_QPID(rd_cqe));
 592         if (!qhp)
 593                 wq = NULL;
 594         else {
 595                 pthread_spin_lock(&qhp->lock);
 596                 wq = &(qhp->wq);
 597         }
 598         ret = poll_cq(wq, &(chp->cq), &cqe, &cqe_flushed, &cookie, &credit);
 599         if (ret)
 600                 goto out;
 601
 602         INC_STAT(cqe);
 603         wc->wr_id = cookie;
 604         wc->qp_num = qhp->wq.sq.qid;
 605         wc->vendor_err = CQE_STATUS(&cqe);
 606         wc->wc_flags = 0;
 607
 608         PDBG("%s qpid 0x%x type %d opcode %d status 0x%x wrid hi 0x%x "
 609              "lo 0x%x cookie 0x%llx\n", __func__,
 610              CQE_QPID(&cqe), CQE_TYPE(&cqe),
 611              CQE_OPCODE(&cqe), CQE_STATUS(&cqe), CQE_WRID_HI(&cqe),
 612              CQE_WRID_LOW(&cqe), (unsigned long long)cookie);
 613
 614         if (CQE_TYPE(&cqe) == 0) {
 615                 if (!CQE_STATUS(&cqe))
 616                         wc->byte_len = CQE_LEN(&cqe);
 617                 else
 618                         wc->byte_len = 0;
 619                 wc->opcode = IBV_WC_RECV;
 620         } else {
 621                 switch (CQE_OPCODE(&cqe)) {
 622                 case FW_RI_RDMA_WRITE:
 623                         wc->opcode = IBV_WC_RDMA_WRITE;
 624                         break;
 625                 case FW_RI_READ_REQ:
 626                         wc->opcode = IBV_WC_RDMA_READ;
 627                         wc->byte_len = CQE_LEN(&cqe);
 628                         break;
 629                 case FW_RI_SEND:
 630                 case FW_RI_SEND_WITH_SE:
 631                 case FW_RI_SEND_WITH_INV:
 632                 case FW_RI_SEND_WITH_SE_INV:
 633                         wc->opcode = IBV_WC_SEND;
 634                         break;
 635                 case FW_RI_BIND_MW:
 636                         wc->opcode = IBV_WC_BIND_MW;
 637                         break;
 638                 default:
 639                         PDBG("Unexpected opcode %d "
 640                              "in the CQE received for QPID=0x%0x\n",
 641                              CQE_OPCODE(&cqe), CQE_QPID(&cqe));
 642                         ret = -EINVAL;
 643                         goto out;
 644                 }
 645         }
 646
 647         if (cqe_flushed)
 648                 wc->status = IBV_WC_WR_FLUSH_ERR;
 649         else {
 650
 651                 switch (CQE_STATUS(&cqe)) {
 652                 case T4_ERR_SUCCESS:
 653                         wc->status = IBV_WC_SUCCESS;
 654                         break;
 655                 case T4_ERR_STAG:
 656                         wc->status = IBV_WC_LOC_ACCESS_ERR;
 657                         break;
 658                 case T4_ERR_PDID:
 659                         wc->status = IBV_WC_LOC_PROT_ERR;
 660                         break;
 661                 case T4_ERR_QPID:
 662                 case T4_ERR_ACCESS:
 663                         wc->status = IBV_WC_LOC_ACCESS_ERR;
 664                         break;
 665                 case T4_ERR_WRAP:
 666                         wc->status = IBV_WC_GENERAL_ERR;
 667                         break;
 668                 case T4_ERR_BOUND:
 669                         wc->status = IBV_WC_LOC_LEN_ERR;
 670                         break;
 671                 case T4_ERR_INVALIDATE_SHARED_MR:
 672                 case T4_ERR_INVALIDATE_MR_WITH_MW_BOUND:
 673                         wc->status = IBV_WC_MW_BIND_ERR;
 674                         break;
 675                 case T4_ERR_CRC:
 676                 case T4_ERR_MARKER:
 677                 case T4_ERR_PDU_LEN_ERR:
 678                 case T4_ERR_OUT_OF_RQE:
 679                 case T4_ERR_DDP_VERSION:
 680                 case T4_ERR_RDMA_VERSION:
 681                 case T4_ERR_DDP_QUEUE_NUM:
 682                 case T4_ERR_MSN:
 683                 case T4_ERR_TBIT:
 684                 case T4_ERR_MO:
 685                 case T4_ERR_MSN_RANGE:
 686                 case T4_ERR_IRD_OVERFLOW:
 687                 case T4_ERR_OPCODE:
 688                 case T4_ERR_INTERNAL_ERR:
 689                         wc->status = IBV_WC_FATAL_ERR;
 690                         break;
 691                 case T4_ERR_SWFLUSH:
 692                         wc->status = IBV_WC_WR_FLUSH_ERR;
 693                         break;
 694                 default:
 695                         PDBG("Unexpected cqe_status 0x%x for QPID=0x%0x\n",
 696                              CQE_STATUS(&cqe), CQE_QPID(&cqe));
 697                         wc->status = IBV_WC_FATAL_ERR;
 698                 }
 699         }
 700         if (wc->status && wc->status != IBV_WC_WR_FLUSH_ERR)
 701                 syslog(LOG_NOTICE, "cxgb4 app err cqid %u qpid %u "
 702                         "type %u opcode %u status 0x%x\n",
 703                         chp->cq.cqid, CQE_QPID(&cqe), CQE_TYPE(&cqe),
 704                         CQE_OPCODE(&cqe), CQE_STATUS(&cqe));
 705 out:
 706         if (wq)
 707                 pthread_spin_unlock(&qhp->lock);
 708         return ret;
 709 }
 710
 711 int c4iw_poll_cq(struct ibv_cq *ibcq, int num_entries, struct ibv_wc *wc)
 712 {
 713         struct c4iw_cq *chp;
 714         int npolled;
 715         int err = 0;
 716
 717         chp = to_c4iw_cq(ibcq);
 718
 719         if (t4_cq_in_error(&chp->cq)) {
 720                 t4_reset_cq_in_error(&chp->cq);
 721                 c4iw_flush_qps(chp->rhp);
 722         }
 723
 724         if (!num_entries)
 725                 return t4_cq_notempty(&chp->cq);
 726
 727         pthread_spin_lock(&chp->lock);
 728         for (npolled = 0; npolled < num_entries; ++npolled) {
 729                 do {
 730                         err = c4iw_poll_cq_one(chp, wc + npolled);
 731                 } while (err == -EAGAIN);
 732                 if (err)
 733                         break;
 734         }
 735         pthread_spin_unlock(&chp->lock);
 736         return !err || err == -ENODATA ? npolled : err;
 737 }
 738
 739 int c4iw_arm_cq(struct ibv_cq *ibcq, int solicited)
 740 {
 741         struct c4iw_cq *chp;
 742         int ret;
 743
 744         INC_STAT(arm);
 745         chp = to_c4iw_cq(ibcq);
 746         pthread_spin_lock(&chp->lock);
 747         ret = t4_arm_cq(&chp->cq, solicited);
 748         pthread_spin_unlock(&chp->lock);
 749         return ret;
 750 }