drivers/infiniband/hw/cxgb4/cq.c

   1 /*
   2  * Copyright (c) 2009-2010 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
  33 #include "iw_cxgb4.h"
  34
  35 static int destroy_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
  36                       struct c4iw_dev_ucontext *uctx, struct sk_buff *skb,
  37                       struct c4iw_wr_wait *wr_waitp)
  38 {
  39         struct fw_ri_res_wr *res_wr;
  40         struct fw_ri_res *res;
  41         int wr_len;
  42         int ret;
  43
  44         wr_len = sizeof *res_wr + sizeof *res;
  45         set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
  46
  47         res_wr = __skb_put_zero(skb, wr_len);
  48         res_wr->op_nres = cpu_to_be32(
  49                         FW_WR_OP_V(FW_RI_RES_WR) |
  50                         FW_RI_RES_WR_NRES_V(1) |
  51                         FW_WR_COMPL_F);
  52         res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16));
  53         res_wr->cookie = (uintptr_t)wr_waitp;
  54         res = res_wr->res;
  55         res->u.cq.restype = FW_RI_RES_TYPE_CQ;
  56         res->u.cq.op = FW_RI_RES_OP_RESET;
  57         res->u.cq.iqid = cpu_to_be32(cq->cqid);
  58
  59         c4iw_init_wr_wait(wr_waitp);
  60         ret = c4iw_ref_send_wait(rdev, skb, wr_waitp, 0, 0, __func__);
  61
  62         kfree(cq->sw_queue);
  63         dma_free_coherent(&(rdev->lldi.pdev->dev),
  64                           cq->memsize, cq->queue,
  65                           dma_unmap_addr(cq, mapping));
  66         c4iw_put_cqid(rdev, cq->cqid, uctx);
  67         return ret;
  68 }
  69
  70 static int create_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
  71                      struct c4iw_dev_ucontext *uctx,
  72                      struct c4iw_wr_wait *wr_waitp)
  73 {
  74         struct fw_ri_res_wr *res_wr;
  75         struct fw_ri_res *res;
  76         int wr_len;
  77         int user = (uctx != &rdev->uctx);
  78         int ret;
  79         struct sk_buff *skb;
  80
  81         cq->cqid = c4iw_get_cqid(rdev, uctx);
  82         if (!cq->cqid) {
  83                 ret = -ENOMEM;
  84                 goto err1;
  85         }
  86
  87         if (!user) {
  88                 cq->sw_queue = kzalloc(cq->memsize, GFP_KERNEL);
  89                 if (!cq->sw_queue) {
  90                         ret = -ENOMEM;
  91                         goto err2;
  92                 }
  93         }
  94         cq->queue = dma_alloc_coherent(&rdev->lldi.pdev->dev, cq->memsize,
  95                                        &cq->dma_addr, GFP_KERNEL);
  96         if (!cq->queue) {
  97                 ret = -ENOMEM;
  98                 goto err3;
  99         }
 100         dma_unmap_addr_set(cq, mapping, cq->dma_addr);
 101         memset(cq->queue, 0, cq->memsize);
 102
 103         /* build fw_ri_res_wr */
 104         wr_len = sizeof *res_wr + sizeof *res;
 105
 106         skb = alloc_skb(wr_len, GFP_KERNEL);
 107         if (!skb) {
 108                 ret = -ENOMEM;
 109                 goto err4;
 110         }
 111         set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
 112
 113         res_wr = __skb_put_zero(skb, wr_len);
 114         res_wr->op_nres = cpu_to_be32(
 115                         FW_WR_OP_V(FW_RI_RES_WR) |
 116                         FW_RI_RES_WR_NRES_V(1) |
 117                         FW_WR_COMPL_F);
 118         res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16));
 119         res_wr->cookie = (uintptr_t)wr_waitp;
 120         res = res_wr->res;
 121         res->u.cq.restype = FW_RI_RES_TYPE_CQ;
 122         res->u.cq.op = FW_RI_RES_OP_WRITE;
 123         res->u.cq.iqid = cpu_to_be32(cq->cqid);
 124         res->u.cq.iqandst_to_iqandstindex = cpu_to_be32(
 125                         FW_RI_RES_WR_IQANUS_V(0) |
 126                         FW_RI_RES_WR_IQANUD_V(1) |
 127                         FW_RI_RES_WR_IQANDST_F |
 128                         FW_RI_RES_WR_IQANDSTINDEX_V(
 129                                 rdev->lldi.ciq_ids[cq->vector]));
 130         res->u.cq.iqdroprss_to_iqesize = cpu_to_be16(
 131                         FW_RI_RES_WR_IQDROPRSS_F |
 132                         FW_RI_RES_WR_IQPCIECH_V(2) |
 133                         FW_RI_RES_WR_IQINTCNTTHRESH_V(0) |
 134                         FW_RI_RES_WR_IQO_F |
 135                         FW_RI_RES_WR_IQESIZE_V(1));
 136         res->u.cq.iqsize = cpu_to_be16(cq->size);
 137         res->u.cq.iqaddr = cpu_to_be64(cq->dma_addr);
 138
 139         c4iw_init_wr_wait(wr_waitp);
 140         ret = c4iw_ref_send_wait(rdev, skb, wr_waitp, 0, 0, __func__);
 141         if (ret)
 142                 goto err4;
 143
 144         cq->gen = 1;
 145         cq->gts = rdev->lldi.gts_reg;
 146         cq->rdev = rdev;
 147
 148         cq->bar2_va = c4iw_bar2_addrs(rdev, cq->cqid, T4_BAR2_QTYPE_INGRESS,
 149                                       &cq->bar2_qid,
 150                                       user ? &cq->bar2_pa : NULL);
 151         if (user && !cq->bar2_pa) {
 152                 pr_warn("%s: cqid %u not in BAR2 range\n",
 153                         pci_name(rdev->lldi.pdev), cq->cqid);
 154                 ret = -EINVAL;
 155                 goto err4;
 156         }
 157         return 0;
 158 err4:
 159         dma_free_coherent(&rdev->lldi.pdev->dev, cq->memsize, cq->queue,
 160                           dma_unmap_addr(cq, mapping));
 161 err3:
 162         kfree(cq->sw_queue);
 163 err2:
 164         c4iw_put_cqid(rdev, cq->cqid, uctx);
 165 err1:
 166         return ret;
 167 }
 168
 169 static void insert_recv_cqe(struct t4_wq *wq, struct t4_cq *cq)
 170 {
 171         struct t4_cqe cqe;
 172
 173         pr_debug("wq %p cq %p sw_cidx %u sw_pidx %u\n",
 174                  wq, cq, cq->sw_cidx, cq->sw_pidx);
 175         memset(&cqe, 0, sizeof(cqe));
 176         cqe.header = cpu_to_be32(CQE_STATUS_V(T4_ERR_SWFLUSH) |
 177                                  CQE_OPCODE_V(FW_RI_SEND) |
 178                                  CQE_TYPE_V(0) |
 179                                  CQE_SWCQE_V(1) |
 180                                  CQE_QPID_V(wq->sq.qid));
 181         cqe.bits_type_ts = cpu_to_be64(CQE_GENBIT_V((u64)cq->gen));
 182         cq->sw_queue[cq->sw_pidx] = cqe;
 183         t4_swcq_produce(cq);
 184 }
 185
 186 int c4iw_flush_rq(struct t4_wq *wq, struct t4_cq *cq, int count)
 187 {
 188         int flushed = 0;
 189         int in_use = wq->rq.in_use - count;
 190
 191         pr_debug("wq %p cq %p rq.in_use %u skip count %u\n",
 192                  wq, cq, wq->rq.in_use, count);
 193         while (in_use--) {
 194                 insert_recv_cqe(wq, cq);
 195                 flushed++;
 196         }
 197         return flushed;
 198 }
 199
 200 static void insert_sq_cqe(struct t4_wq *wq, struct t4_cq *cq,
 201                           struct t4_swsqe *swcqe)
 202 {
 203         struct t4_cqe cqe;
 204
 205         pr_debug("wq %p cq %p sw_cidx %u sw_pidx %u\n",
 206                  wq, cq, cq->sw_cidx, cq->sw_pidx);
 207         memset(&cqe, 0, sizeof(cqe));
 208         cqe.header = cpu_to_be32(CQE_STATUS_V(T4_ERR_SWFLUSH) |
 209                                  CQE_OPCODE_V(swcqe->opcode) |
 210                                  CQE_TYPE_V(1) |
 211                                  CQE_SWCQE_V(1) |
 212                                  CQE_QPID_V(wq->sq.qid));
 213         CQE_WRID_SQ_IDX(&cqe) = swcqe->idx;
 214         cqe.bits_type_ts = cpu_to_be64(CQE_GENBIT_V((u64)cq->gen));
 215         cq->sw_queue[cq->sw_pidx] = cqe;
 216         t4_swcq_produce(cq);
 217 }
 218
 219 static void advance_oldest_read(struct t4_wq *wq);
 220
 221 int c4iw_flush_sq(struct c4iw_qp *qhp)
 222 {
 223         int flushed = 0;
 224         struct t4_wq *wq = &qhp->wq;
 225         struct c4iw_cq *chp = to_c4iw_cq(qhp->ibqp.send_cq);
 226         struct t4_cq *cq = &chp->cq;
 227         int idx;
 228         struct t4_swsqe *swsqe;
 229
 230         if (wq->sq.flush_cidx == -1)
 231                 wq->sq.flush_cidx = wq->sq.cidx;
 232         idx = wq->sq.flush_cidx;
 233         while (idx != wq->sq.pidx) {
 234                 swsqe = &wq->sq.sw_sq[idx];
 235                 swsqe->flushed = 1;
 236                 insert_sq_cqe(wq, cq, swsqe);
 237                 if (wq->sq.oldest_read == swsqe) {
 238                         advance_oldest_read(wq);
 239                 }
 240                 flushed++;
 241                 if (++idx == wq->sq.size)
 242                         idx = 0;
 243         }
 244         wq->sq.flush_cidx += flushed;
 245         if (wq->sq.flush_cidx >= wq->sq.size)
 246                 wq->sq.flush_cidx -= wq->sq.size;
 247         return flushed;
 248 }
 249
 250 static void flush_completed_wrs(struct t4_wq *wq, struct t4_cq *cq)
 251 {
 252         struct t4_swsqe *swsqe;
 253         int cidx;
 254
 255         if (wq->sq.flush_cidx == -1)
 256                 wq->sq.flush_cidx = wq->sq.cidx;
 257         cidx = wq->sq.flush_cidx;
 258
 259         while (cidx != wq->sq.pidx) {
 260                 swsqe = &wq->sq.sw_sq[cidx];
 261                 if (!swsqe->signaled) {
 262                         if (++cidx == wq->sq.size)
 263                                 cidx = 0;
 264                 } else if (swsqe->complete) {
 265
 266                         /*
 267                          * Insert this completed cqe into the swcq.
 268                          */
 269                         pr_debug("moving cqe into swcq sq idx %u cq idx %u\n",
 270                                  cidx, cq->sw_pidx);
 271                         swsqe->cqe.header |= htonl(CQE_SWCQE_V(1));
 272                         cq->sw_queue[cq->sw_pidx] = swsqe->cqe;
 273                         t4_swcq_produce(cq);
 274                         swsqe->flushed = 1;
 275                         if (++cidx == wq->sq.size)
 276                                 cidx = 0;
 277                         wq->sq.flush_cidx = cidx;
 278                 } else
 279                         break;
 280         }
 281 }
 282
 283 static void create_read_req_cqe(struct t4_wq *wq, struct t4_cqe *hw_cqe,
 284                 struct t4_cqe *read_cqe)
 285 {
 286         read_cqe->u.scqe.cidx = wq->sq.oldest_read->idx;
 287         read_cqe->len = htonl(wq->sq.oldest_read->read_len);
 288         read_cqe->header = htonl(CQE_QPID_V(CQE_QPID(hw_cqe)) |
 289                         CQE_SWCQE_V(SW_CQE(hw_cqe)) |
 290                         CQE_OPCODE_V(FW_RI_READ_REQ) |
 291                         CQE_TYPE_V(1));
 292         read_cqe->bits_type_ts = hw_cqe->bits_type_ts;
 293 }
 294
 295 static void advance_oldest_read(struct t4_wq *wq)
 296 {
 297
 298         u32 rptr = wq->sq.oldest_read - wq->sq.sw_sq + 1;
 299
 300         if (rptr == wq->sq.size)
 301                 rptr = 0;
 302         while (rptr != wq->sq.pidx) {
 303                 wq->sq.oldest_read = &wq->sq.sw_sq[rptr];
 304
 305                 if (wq->sq.oldest_read->opcode == FW_RI_READ_REQ)
 306                         return;
 307                 if (++rptr == wq->sq.size)
 308                         rptr = 0;
 309         }
 310         wq->sq.oldest_read = NULL;
 311 }
 312
 313 /*
 314  * Move all CQEs from the HWCQ into the SWCQ.
 315  * Deal with out-of-order and/or completions that complete
 316  * prior unsignalled WRs.
 317  */
 318 void c4iw_flush_hw_cq(struct c4iw_cq *chp)
 319 {
 320         struct t4_cqe *hw_cqe, *swcqe, read_cqe;
 321         struct c4iw_qp *qhp;
 322         struct t4_swsqe *swsqe;
 323         int ret;
 324
 325         pr_debug("cqid 0x%x\n", chp->cq.cqid);
 326         ret = t4_next_hw_cqe(&chp->cq, &hw_cqe);
 327
 328         /*
 329          * This logic is similar to poll_cq(), but not quite the same
 330          * unfortunately.  Need to move pertinent HW CQEs to the SW CQ but
 331          * also do any translation magic that poll_cq() normally does.
 332          */
 333         while (!ret) {
 334                 qhp = get_qhp(chp->rhp, CQE_QPID(hw_cqe));
 335
 336                 /*
 337                  * drop CQEs with no associated QP
 338                  */
 339                 if (qhp == NULL)
 340                         goto next_cqe;
 341
 342                 if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE)
 343                         goto next_cqe;
 344
 345                 if (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP) {
 346
 347                         /* If we have reached here because of async
 348                          * event or other error, and have egress error
 349                          * then drop
 350                          */
 351                         if (CQE_TYPE(hw_cqe) == 1)
 352                                 goto next_cqe;
 353
 354                         /* drop peer2peer RTR reads.
 355                          */
 356                         if (CQE_WRID_STAG(hw_cqe) == 1)
 357                                 goto next_cqe;
 358
 359                         /*
 360                          * Eat completions for unsignaled read WRs.
 361                          */
 362                         if (!qhp->wq.sq.oldest_read->signaled) {
 363                                 advance_oldest_read(&qhp->wq);
 364                                 goto next_cqe;
 365                         }
 366
 367                         /*
 368                          * Don't write to the HWCQ, create a new read req CQE
 369                          * in local memory and move it into the swcq.
 370                          */
 371                         create_read_req_cqe(&qhp->wq, hw_cqe, &read_cqe);
 372                         hw_cqe = &read_cqe;
 373                         advance_oldest_read(&qhp->wq);
 374                 }
 375
 376                 /* if its a SQ completion, then do the magic to move all the
 377                  * unsignaled and now in-order completions into the swcq.
 378                  */
 379                 if (SQ_TYPE(hw_cqe)) {
 380                         swsqe = &qhp->wq.sq.sw_sq[CQE_WRID_SQ_IDX(hw_cqe)];
 381                         swsqe->cqe = *hw_cqe;
 382                         swsqe->complete = 1;
 383                         flush_completed_wrs(&qhp->wq, &chp->cq);
 384                 } else {
 385                         swcqe = &chp->cq.sw_queue[chp->cq.sw_pidx];
 386                         *swcqe = *hw_cqe;
 387                         swcqe->header |= cpu_to_be32(CQE_SWCQE_V(1));
 388                         t4_swcq_produce(&chp->cq);
 389                 }
 390 next_cqe:
 391                 t4_hwcq_consume(&chp->cq);
 392                 ret = t4_next_hw_cqe(&chp->cq, &hw_cqe);
 393         }
 394 }
 395
 396 static int cqe_completes_wr(struct t4_cqe *cqe, struct t4_wq *wq)
 397 {
 398         if (DRAIN_CQE(cqe)) {
 399                 WARN_ONCE(1, "Unexpected DRAIN CQE qp id %u!\n", wq->sq.qid);
 400                 return 0;
 401         }
 402
 403         if (CQE_OPCODE(cqe) == FW_RI_TERMINATE)
 404                 return 0;
 405
 406         if ((CQE_OPCODE(cqe) == FW_RI_RDMA_WRITE) && RQ_TYPE(cqe))
 407                 return 0;
 408
 409         if ((CQE_OPCODE(cqe) == FW_RI_READ_RESP) && SQ_TYPE(cqe))
 410                 return 0;
 411
 412         if (CQE_SEND_OPCODE(cqe) && RQ_TYPE(cqe) && t4_rq_empty(wq))
 413                 return 0;
 414         return 1;
 415 }
 416
 417 void c4iw_count_rcqes(struct t4_cq *cq, struct t4_wq *wq, int *count)
 418 {
 419         struct t4_cqe *cqe;
 420         u32 ptr;
 421
 422         *count = 0;
 423         pr_debug("count zero %d\n", *count);
 424         ptr = cq->sw_cidx;
 425         while (ptr != cq->sw_pidx) {
 426                 cqe = &cq->sw_queue[ptr];
 427                 if (RQ_TYPE(cqe) && (CQE_OPCODE(cqe) != FW_RI_READ_RESP) &&
 428                     (CQE_QPID(cqe) == wq->sq.qid) && cqe_completes_wr(cqe, wq))
 429                         (*count)++;
 430                 if (++ptr == cq->size)
 431                         ptr = 0;
 432         }
 433         pr_debug("cq %p count %d\n", cq, *count);
 434 }
 435
 436 /*
 437  * poll_cq
 438  *
 439  * Caller must:
 440  *     check the validity of the first CQE,
 441  *     supply the wq assicated with the qpid.
 442  *
 443  * credit: cq credit to return to sge.
 444  * cqe_flushed: 1 iff the CQE is flushed.
 445  * cqe: copy of the polled CQE.
 446  *
 447  * return value:
 448  *    0             CQE returned ok.
 449  *    -EAGAIN       CQE skipped, try again.
 450  *    -EOVERFLOW    CQ overflow detected.
 451  */
 452 static int poll_cq(struct t4_wq *wq, struct t4_cq *cq, struct t4_cqe *cqe,
 453                    u8 *cqe_flushed, u64 *cookie, u32 *credit)
 454 {
 455         int ret = 0;
 456         struct t4_cqe *hw_cqe, read_cqe;
 457
 458         *cqe_flushed = 0;
 459         *credit = 0;
 460         ret = t4_next_cqe(cq, &hw_cqe);
 461         if (ret)
 462                 return ret;
 463
 464         pr_debug("CQE OVF %u qpid 0x%0x genbit %u type %u status 0x%0x opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
 465                  CQE_OVFBIT(hw_cqe), CQE_QPID(hw_cqe),
 466                  CQE_GENBIT(hw_cqe), CQE_TYPE(hw_cqe), CQE_STATUS(hw_cqe),
 467                  CQE_OPCODE(hw_cqe), CQE_LEN(hw_cqe), CQE_WRID_HI(hw_cqe),
 468                  CQE_WRID_LOW(hw_cqe));
 469
 470         /*
 471          * skip cqe's not affiliated with a QP.
 472          */
 473         if (wq == NULL) {
 474                 ret = -EAGAIN;
 475                 goto skip_cqe;
 476         }
 477
 478         /*
 479         * skip hw cqe's if the wq is flushed.
 480         */
 481         if (wq->flushed && !SW_CQE(hw_cqe)) {
 482                 ret = -EAGAIN;
 483                 goto skip_cqe;
 484         }
 485
 486         /*
 487          * skip TERMINATE cqes...
 488          */
 489         if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE) {
 490                 ret = -EAGAIN;
 491                 goto skip_cqe;
 492         }
 493
 494         /*
 495          * Special cqe for drain WR completions...
 496          */
 497         if (DRAIN_CQE(hw_cqe)) {
 498                 *cookie = CQE_DRAIN_COOKIE(hw_cqe);
 499                 *cqe = *hw_cqe;
 500                 goto skip_cqe;
 501         }
 502
 503         /*
 504          * Gotta tweak READ completions:
 505          *      1) the cqe doesn't contain the sq_wptr from the wr.
 506          *      2) opcode not reflected from the wr.
 507          *      3) read_len not reflected from the wr.
 508          *      4) cq_type is RQ_TYPE not SQ_TYPE.
 509          */
 510         if (RQ_TYPE(hw_cqe) && (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP)) {
 511
 512                 /* If we have reached here because of async
 513                  * event or other error, and have egress error
 514                  * then drop
 515                  */
 516                 if (CQE_TYPE(hw_cqe) == 1) {
 517                         if (CQE_STATUS(hw_cqe))
 518                                 t4_set_wq_in_error(wq);
 519                         ret = -EAGAIN;
 520                         goto skip_cqe;
 521                 }
 522
 523                 /* If this is an unsolicited read response, then the read
 524                  * was generated by the kernel driver as part of peer-2-peer
 525                  * connection setup.  So ignore the completion.
 526                  */
 527                 if (CQE_WRID_STAG(hw_cqe) == 1) {
 528                         if (CQE_STATUS(hw_cqe))
 529                                 t4_set_wq_in_error(wq);
 530                         ret = -EAGAIN;
 531                         goto skip_cqe;
 532                 }
 533
 534                 /*
 535                  * Eat completions for unsignaled read WRs.
 536                  */
 537                 if (!wq->sq.oldest_read->signaled) {
 538                         advance_oldest_read(wq);
 539                         ret = -EAGAIN;
 540                         goto skip_cqe;
 541                 }
 542
 543                 /*
 544                  * Don't write to the HWCQ, so create a new read req CQE
 545                  * in local memory.
 546                  */
 547                 create_read_req_cqe(wq, hw_cqe, &read_cqe);
 548                 hw_cqe = &read_cqe;
 549                 advance_oldest_read(wq);
 550         }
 551
 552         if (CQE_STATUS(hw_cqe) || t4_wq_in_error(wq)) {
 553                 *cqe_flushed = (CQE_STATUS(hw_cqe) == T4_ERR_SWFLUSH);
 554                 t4_set_wq_in_error(wq);
 555         }
 556
 557         /*
 558          * RECV completion.
 559          */
 560         if (RQ_TYPE(hw_cqe)) {
 561
 562                 /*
 563                  * HW only validates 4 bits of MSN.  So we must validate that
 564                  * the MSN in the SEND is the next expected MSN.  If its not,
 565                  * then we complete this with T4_ERR_MSN and mark the wq in
 566                  * error.
 567                  */
 568
 569                 if (t4_rq_empty(wq)) {
 570                         t4_set_wq_in_error(wq);
 571                         ret = -EAGAIN;
 572                         goto skip_cqe;
 573                 }
 574                 if (unlikely(!CQE_STATUS(hw_cqe) &&
 575                              CQE_WRID_MSN(hw_cqe) != wq->rq.msn)) {
 576                         t4_set_wq_in_error(wq);
 577                         hw_cqe->header |= cpu_to_be32(CQE_STATUS_V(T4_ERR_MSN));
 578                 }
 579                 goto proc_cqe;
 580         }
 581
 582         /*
 583          * If we get here its a send completion.
 584          *
 585          * Handle out of order completion. These get stuffed
 586          * in the SW SQ. Then the SW SQ is walked to move any
 587          * now in-order completions into the SW CQ.  This handles
 588          * 2 cases:
 589          *      1) reaping unsignaled WRs when the first subsequent
 590          *         signaled WR is completed.
 591          *      2) out of order read completions.
 592          */
 593         if (!SW_CQE(hw_cqe) && (CQE_WRID_SQ_IDX(hw_cqe) != wq->sq.cidx)) {
 594                 struct t4_swsqe *swsqe;
 595
 596                 pr_debug("out of order completion going in sw_sq at idx %u\n",
 597                          CQE_WRID_SQ_IDX(hw_cqe));
 598                 swsqe = &wq->sq.sw_sq[CQE_WRID_SQ_IDX(hw_cqe)];
 599                 swsqe->cqe = *hw_cqe;
 600                 swsqe->complete = 1;
 601                 ret = -EAGAIN;
 602                 goto flush_wq;
 603         }
 604
 605 proc_cqe:
 606         *cqe = *hw_cqe;
 607
 608         /*
 609          * Reap the associated WR(s) that are freed up with this
 610          * completion.
 611          */
 612         if (SQ_TYPE(hw_cqe)) {
 613                 int idx = CQE_WRID_SQ_IDX(hw_cqe);
 614
 615                 /*
 616                 * Account for any unsignaled completions completed by
 617                 * this signaled completion.  In this case, cidx points
 618                 * to the first unsignaled one, and idx points to the
 619                 * signaled one.  So adjust in_use based on this delta.
 620                 * if this is not completing any unsigned wrs, then the
 621                 * delta will be 0. Handle wrapping also!
 622                 */
 623                 if (idx < wq->sq.cidx)
 624                         wq->sq.in_use -= wq->sq.size + idx - wq->sq.cidx;
 625                 else
 626                         wq->sq.in_use -= idx - wq->sq.cidx;
 627
 628                 wq->sq.cidx = (uint16_t)idx;
 629                 pr_debug("completing sq idx %u\n", wq->sq.cidx);
 630                 *cookie = wq->sq.sw_sq[wq->sq.cidx].wr_id;
 631                 if (c4iw_wr_log)
 632                         c4iw_log_wr_stats(wq, hw_cqe);
 633                 t4_sq_consume(wq);
 634         } else {
 635                 pr_debug("completing rq idx %u\n", wq->rq.cidx);
 636                 *cookie = wq->rq.sw_rq[wq->rq.cidx].wr_id;
 637                 if (c4iw_wr_log)
 638                         c4iw_log_wr_stats(wq, hw_cqe);
 639                 t4_rq_consume(wq);
 640                 goto skip_cqe;
 641         }
 642
 643 flush_wq:
 644         /*
 645          * Flush any completed cqes that are now in-order.
 646          */
 647         flush_completed_wrs(wq, cq);
 648
 649 skip_cqe:
 650         if (SW_CQE(hw_cqe)) {
 651                 pr_debug("cq %p cqid 0x%x skip sw cqe cidx %u\n",
 652                          cq, cq->cqid, cq->sw_cidx);
 653                 t4_swcq_consume(cq);
 654         } else {
 655                 pr_debug("cq %p cqid 0x%x skip hw cqe cidx %u\n",
 656                          cq, cq->cqid, cq->cidx);
 657                 t4_hwcq_consume(cq);
 658         }
 659         return ret;
 660 }
 661
 662 /*
 663  * Get one cq entry from c4iw and map it to openib.
 664  *
 665  * Returns:
 666  *      0                       cqe returned
 667  *      -ENODATA                EMPTY;
 668  *      -EAGAIN                 caller must try again
 669  *      any other -errno        fatal error
 670  */
 671 static int c4iw_poll_cq_one(struct c4iw_cq *chp, struct ib_wc *wc)
 672 {
 673         struct c4iw_qp *qhp = NULL;
 674         struct t4_cqe uninitialized_var(cqe), *rd_cqe;
 675         struct t4_wq *wq;
 676         u32 credit = 0;
 677         u8 cqe_flushed;
 678         u64 cookie = 0;
 679         int ret;
 680
 681         ret = t4_next_cqe(&chp->cq, &rd_cqe);
 682
 683         if (ret)
 684                 return ret;
 685
 686         qhp = get_qhp(chp->rhp, CQE_QPID(rd_cqe));
 687         if (!qhp)
 688                 wq = NULL;
 689         else {
 690                 spin_lock(&qhp->lock);
 691                 wq = &(qhp->wq);
 692         }
 693         ret = poll_cq(wq, &(chp->cq), &cqe, &cqe_flushed, &cookie, &credit);
 694         if (ret)
 695                 goto out;
 696
 697         wc->wr_id = cookie;
 698         wc->qp = &qhp->ibqp;
 699         wc->vendor_err = CQE_STATUS(&cqe);
 700         wc->wc_flags = 0;
 701
 702         pr_debug("qpid 0x%x type %d opcode %d status 0x%x len %u wrid hi 0x%x lo 0x%x cookie 0x%llx\n",
 703                  CQE_QPID(&cqe),
 704                  CQE_TYPE(&cqe), CQE_OPCODE(&cqe),
 705                  CQE_STATUS(&cqe), CQE_LEN(&cqe),
 706                  CQE_WRID_HI(&cqe), CQE_WRID_LOW(&cqe),
 707                  (unsigned long long)cookie);
 708
 709         if (CQE_TYPE(&cqe) == 0) {
 710                 if (!CQE_STATUS(&cqe))
 711                         wc->byte_len = CQE_LEN(&cqe);
 712                 else
 713                         wc->byte_len = 0;
 714                 wc->opcode = IB_WC_RECV;
 715                 if (CQE_OPCODE(&cqe) == FW_RI_SEND_WITH_INV ||
 716                     CQE_OPCODE(&cqe) == FW_RI_SEND_WITH_SE_INV) {
 717                         wc->ex.invalidate_rkey = CQE_WRID_STAG(&cqe);
 718                         wc->wc_flags |= IB_WC_WITH_INVALIDATE;
 719                         c4iw_invalidate_mr(qhp->rhp, wc->ex.invalidate_rkey);
 720                 }
 721         } else {
 722                 switch (CQE_OPCODE(&cqe)) {
 723                 case FW_RI_RDMA_WRITE:
 724                         wc->opcode = IB_WC_RDMA_WRITE;
 725                         break;
 726                 case FW_RI_READ_REQ:
 727                         wc->opcode = IB_WC_RDMA_READ;
 728                         wc->byte_len = CQE_LEN(&cqe);
 729                         break;
 730                 case FW_RI_SEND_WITH_INV:
 731                 case FW_RI_SEND_WITH_SE_INV:
 732                         wc->opcode = IB_WC_SEND;
 733                         wc->wc_flags |= IB_WC_WITH_INVALIDATE;
 734                         break;
 735                 case FW_RI_SEND:
 736                 case FW_RI_SEND_WITH_SE:
 737                         wc->opcode = IB_WC_SEND;
 738                         break;
 739
 740                 case FW_RI_LOCAL_INV:
 741                         wc->opcode = IB_WC_LOCAL_INV;
 742                         break;
 743                 case FW_RI_FAST_REGISTER:
 744                         wc->opcode = IB_WC_REG_MR;
 745
 746                         /* Invalidate the MR if the fastreg failed */
 747                         if (CQE_STATUS(&cqe) != T4_ERR_SUCCESS)
 748                                 c4iw_invalidate_mr(qhp->rhp,
 749                                                    CQE_WRID_FR_STAG(&cqe));
 750                         break;
 751                 default:
 752                         pr_err("Unexpected opcode %d in the CQE received for QPID=0x%0x\n",
 753                                CQE_OPCODE(&cqe), CQE_QPID(&cqe));
 754                         ret = -EINVAL;
 755                         goto out;
 756                 }
 757         }
 758
 759         if (cqe_flushed)
 760                 wc->status = IB_WC_WR_FLUSH_ERR;
 761         else {
 762
 763                 switch (CQE_STATUS(&cqe)) {
 764                 case T4_ERR_SUCCESS:
 765                         wc->status = IB_WC_SUCCESS;
 766                         break;
 767                 case T4_ERR_STAG:
 768                         wc->status = IB_WC_LOC_ACCESS_ERR;
 769                         break;
 770                 case T4_ERR_PDID:
 771                         wc->status = IB_WC_LOC_PROT_ERR;
 772                         break;
 773                 case T4_ERR_QPID:
 774                 case T4_ERR_ACCESS:
 775                         wc->status = IB_WC_LOC_ACCESS_ERR;
 776                         break;
 777                 case T4_ERR_WRAP:
 778                         wc->status = IB_WC_GENERAL_ERR;
 779                         break;
 780                 case T4_ERR_BOUND:
 781                         wc->status = IB_WC_LOC_LEN_ERR;
 782                         break;
 783                 case T4_ERR_INVALIDATE_SHARED_MR:
 784                 case T4_ERR_INVALIDATE_MR_WITH_MW_BOUND:
 785                         wc->status = IB_WC_MW_BIND_ERR;
 786                         break;
 787                 case T4_ERR_CRC:
 788                 case T4_ERR_MARKER:
 789                 case T4_ERR_PDU_LEN_ERR:
 790                 case T4_ERR_OUT_OF_RQE:
 791                 case T4_ERR_DDP_VERSION:
 792                 case T4_ERR_RDMA_VERSION:
 793                 case T4_ERR_DDP_QUEUE_NUM:
 794                 case T4_ERR_MSN:
 795                 case T4_ERR_TBIT:
 796                 case T4_ERR_MO:
 797                 case T4_ERR_MSN_RANGE:
 798                 case T4_ERR_IRD_OVERFLOW:
 799                 case T4_ERR_OPCODE:
 800                 case T4_ERR_INTERNAL_ERR:
 801                         wc->status = IB_WC_FATAL_ERR;
 802                         break;
 803                 case T4_ERR_SWFLUSH:
 804                         wc->status = IB_WC_WR_FLUSH_ERR;
 805                         break;
 806                 default:
 807                         pr_err("Unexpected cqe_status 0x%x for QPID=0x%0x\n",
 808                                CQE_STATUS(&cqe), CQE_QPID(&cqe));
 809                         wc->status = IB_WC_FATAL_ERR;
 810                 }
 811         }
 812 out:
 813         if (wq)
 814                 spin_unlock(&qhp->lock);
 815         return ret;
 816 }
 817
 818 int c4iw_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 819 {
 820         struct c4iw_cq *chp;
 821         unsigned long flags;
 822         int npolled;
 823         int err = 0;
 824
 825         chp = to_c4iw_cq(ibcq);
 826
 827         spin_lock_irqsave(&chp->lock, flags);
 828         for (npolled = 0; npolled < num_entries; ++npolled) {
 829                 do {
 830                         err = c4iw_poll_cq_one(chp, wc + npolled);
 831                 } while (err == -EAGAIN);
 832                 if (err)
 833                         break;
 834         }
 835         spin_unlock_irqrestore(&chp->lock, flags);
 836         return !err || err == -ENODATA ? npolled : err;
 837 }
 838
 839 int c4iw_destroy_cq(struct ib_cq *ib_cq)
 840 {
 841         struct c4iw_cq *chp;
 842         struct c4iw_ucontext *ucontext;
 843
 844         pr_debug("ib_cq %p\n", ib_cq);
 845         chp = to_c4iw_cq(ib_cq);
 846
 847         remove_handle(chp->rhp, &chp->rhp->cqidr, chp->cq.cqid);
 848         atomic_dec(&chp->refcnt);
 849         wait_event(chp->wait, !atomic_read(&chp->refcnt));
 850
 851         ucontext = ib_cq->uobject ? to_c4iw_ucontext(ib_cq->uobject->context)
 852                                   : NULL;
 853         destroy_cq(&chp->rhp->rdev, &chp->cq,
 854                    ucontext ? &ucontext->uctx : &chp->cq.rdev->uctx,
 855                    chp->destroy_skb, chp->wr_waitp);
 856         c4iw_put_wr_wait(chp->wr_waitp);
 857         kfree(chp);
 858         return 0;
 859 }
 860
 861 struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,
 862                              const struct ib_cq_init_attr *attr,
 863                              struct ib_ucontext *ib_context,
 864                              struct ib_udata *udata)
 865 {
 866         int entries = attr->cqe;
 867         int vector = attr->comp_vector;
 868         struct c4iw_dev *rhp;
 869         struct c4iw_cq *chp;
 870         struct c4iw_create_cq_resp uresp;
 871         struct c4iw_ucontext *ucontext = NULL;
 872         int ret, wr_len;
 873         size_t memsize, hwentries;
 874         struct c4iw_mm_entry *mm, *mm2;
 875
 876         pr_debug("ib_dev %p entries %d\n", ibdev, entries);
 877         if (attr->flags)
 878                 return ERR_PTR(-EINVAL);
 879
 880         rhp = to_c4iw_dev(ibdev);
 881
 882         if (vector >= rhp->rdev.lldi.nciq)
 883                 return ERR_PTR(-EINVAL);
 884
 885         chp = kzalloc(sizeof(*chp), GFP_KERNEL);
 886         if (!chp)
 887                 return ERR_PTR(-ENOMEM);
 888         chp->wr_waitp = c4iw_alloc_wr_wait(GFP_KERNEL);
 889         if (!chp->wr_waitp) {
 890                 ret = -ENOMEM;
 891                 goto err_free_chp;
 892         }
 893         c4iw_init_wr_wait(chp->wr_waitp);
 894
 895         wr_len = sizeof(struct fw_ri_res_wr) + sizeof(struct fw_ri_res);
 896         chp->destroy_skb = alloc_skb(wr_len, GFP_KERNEL);
 897         if (!chp->destroy_skb) {
 898                 ret = -ENOMEM;
 899                 goto err_free_wr_wait;
 900         }
 901
 902         if (ib_context)
 903                 ucontext = to_c4iw_ucontext(ib_context);
 904
 905         /* account for the status page. */
 906         entries++;
 907
 908         /* IQ needs one extra entry to differentiate full vs empty. */
 909         entries++;
 910
 911         /*
 912          * entries must be multiple of 16 for HW.
 913          */
 914         entries = roundup(entries, 16);
 915
 916         /*
 917          * Make actual HW queue 2x to avoid cdix_inc overflows.
 918          */
 919         hwentries = min(entries * 2, rhp->rdev.hw_queue.t4_max_iq_size);
 920
 921         /*
 922          * Make HW queue at least 64 entries so GTS updates aren't too
 923          * frequent.
 924          */
 925         if (hwentries < 64)
 926                 hwentries = 64;
 927
 928         memsize = hwentries * sizeof *chp->cq.queue;
 929
 930         /*
 931          * memsize must be a multiple of the page size if its a user cq.
 932          */
 933         if (ucontext)
 934                 memsize = roundup(memsize, PAGE_SIZE);
 935         chp->cq.size = hwentries;
 936         chp->cq.memsize = memsize;
 937         chp->cq.vector = vector;
 938
 939         ret = create_cq(&rhp->rdev, &chp->cq,
 940                         ucontext ? &ucontext->uctx : &rhp->rdev.uctx,
 941                         chp->wr_waitp);
 942         if (ret)
 943                 goto err_free_skb;
 944
 945         chp->rhp = rhp;
 946         chp->cq.size--;                         /* status page */
 947         chp->ibcq.cqe = entries - 2;
 948         spin_lock_init(&chp->lock);
 949         spin_lock_init(&chp->comp_handler_lock);
 950         atomic_set(&chp->refcnt, 1);
 951         init_waitqueue_head(&chp->wait);
 952         ret = insert_handle(rhp, &rhp->cqidr, chp, chp->cq.cqid);
 953         if (ret)
 954                 goto err_destroy_cq;
 955
 956         if (ucontext) {
 957                 ret = -ENOMEM;
 958                 mm = kmalloc(sizeof *mm, GFP_KERNEL);
 959                 if (!mm)
 960                         goto err_remove_handle;
 961                 mm2 = kmalloc(sizeof *mm2, GFP_KERNEL);
 962                 if (!mm2)
 963                         goto err_free_mm;
 964
 965                 uresp.qid_mask = rhp->rdev.cqmask;
 966                 uresp.cqid = chp->cq.cqid;
 967                 uresp.size = chp->cq.size;
 968                 uresp.memsize = chp->cq.memsize;
 969                 spin_lock(&ucontext->mmap_lock);
 970                 uresp.key = ucontext->key;
 971                 ucontext->key += PAGE_SIZE;
 972                 uresp.gts_key = ucontext->key;
 973                 ucontext->key += PAGE_SIZE;
 974                 spin_unlock(&ucontext->mmap_lock);
 975                 ret = ib_copy_to_udata(udata, &uresp,
 976                                        sizeof(uresp) - sizeof(uresp.reserved));
 977                 if (ret)
 978                         goto err_free_mm2;
 979
 980                 mm->key = uresp.key;
 981                 mm->addr = virt_to_phys(chp->cq.queue);
 982                 mm->len = chp->cq.memsize;
 983                 insert_mmap(ucontext, mm);
 984
 985                 mm2->key = uresp.gts_key;
 986                 mm2->addr = chp->cq.bar2_pa;
 987                 mm2->len = PAGE_SIZE;
 988                 insert_mmap(ucontext, mm2);
 989         }
 990         pr_debug("cqid 0x%0x chp %p size %u memsize %zu, dma_addr 0x%0llx\n",
 991                  chp->cq.cqid, chp, chp->cq.size,
 992                  chp->cq.memsize, (unsigned long long)chp->cq.dma_addr);
 993         return &chp->ibcq;
 994 err_free_mm2:
 995         kfree(mm2);
 996 err_free_mm:
 997         kfree(mm);
 998 err_remove_handle:
 999         remove_handle(rhp, &rhp->cqidr, chp->cq.cqid);
1000 err_destroy_cq:
1001         destroy_cq(&chp->rhp->rdev, &chp->cq,
1002                    ucontext ? &ucontext->uctx : &rhp->rdev.uctx,
1003                    chp->destroy_skb, chp->wr_waitp);
1004 err_free_skb:
1005         kfree_skb(chp->destroy_skb);
1006 err_free_wr_wait:
1007         c4iw_put_wr_wait(chp->wr_waitp);
1008 err_free_chp:
1009         kfree(chp);
1010         return ERR_PTR(ret);
1011 }
1012
1013 int c4iw_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
1014 {
1015         return -ENOSYS;
1016 }
1017
1018 int c4iw_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
1019 {
1020         struct c4iw_cq *chp;
1021         int ret = 0;
1022         unsigned long flag;
1023
1024         chp = to_c4iw_cq(ibcq);
1025         spin_lock_irqsave(&chp->lock, flag);
1026         t4_arm_cq(&chp->cq,
1027                   (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED);
1028         if (flags & IB_CQ_REPORT_MISSED_EVENTS)
1029                 ret = t4_cq_notempty(&chp->cq);
1030         spin_unlock_irqrestore(&chp->lock, flag);
1031         return ret;
1032 }