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 <rdma/uverbs_ioctl.h>
  34
  35 #include "iw_cxgb4.h"
  36
  37 static void destroy_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
  38                        struct c4iw_dev_ucontext *uctx, struct sk_buff *skb,
  39                        struct c4iw_wr_wait *wr_waitp)
  40 {
  41         struct fw_ri_res_wr *res_wr;
  42         struct fw_ri_res *res;
  43         int wr_len;
  44
  45         wr_len = sizeof(*res_wr) + sizeof(*res);
  46         set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
  47
  48         res_wr = __skb_put_zero(skb, wr_len);
  49         res_wr->op_nres = cpu_to_be32(
  50                         FW_WR_OP_V(FW_RI_RES_WR) |
  51                         FW_RI_RES_WR_NRES_V(1) |
  52                         FW_WR_COMPL_F);
  53         res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16));
  54         res_wr->cookie = (uintptr_t)wr_waitp;
  55         res = res_wr->res;
  56         res->u.cq.restype = FW_RI_RES_TYPE_CQ;
  57         res->u.cq.op = FW_RI_RES_OP_RESET;
  58         res->u.cq.iqid = cpu_to_be32(cq->cqid);
  59
  60         c4iw_init_wr_wait(wr_waitp);
  61         c4iw_ref_send_wait(rdev, skb, wr_waitp, 0, 0, __func__);
  62
  63         kfree(cq->sw_queue);
  64         dma_free_coherent(&(rdev->lldi.pdev->dev),
  65                           cq->memsize, cq->queue,
  66                           dma_unmap_addr(cq, mapping));
  67         c4iw_put_cqid(rdev, cq->cqid, uctx);
  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         struct c4iw_ucontext *ucontext = NULL;
  81
  82         if (user)
  83                 ucontext = container_of(uctx, struct c4iw_ucontext, uctx);
  84
  85         cq->cqid = c4iw_get_cqid(rdev, uctx);
  86         if (!cq->cqid) {
  87                 ret = -ENOMEM;
  88                 goto err1;
  89         }
  90
  91         if (!user) {
  92                 cq->sw_queue = kzalloc(cq->memsize, GFP_KERNEL);
  93                 if (!cq->sw_queue) {
  94                         ret = -ENOMEM;
  95                         goto err2;
  96                 }
  97         }
  98         cq->queue = dma_alloc_coherent(&rdev->lldi.pdev->dev, cq->memsize,
  99                                        &cq->dma_addr, GFP_KERNEL);
 100         if (!cq->queue) {
 101                 ret = -ENOMEM;
 102                 goto err3;
 103         }
 104         dma_unmap_addr_set(cq, mapping, cq->dma_addr);
 105
 106         if (user && ucontext->is_32b_cqe) {
 107                 cq->qp_errp = &((struct t4_status_page *)
 108                 ((u8 *)cq->queue + (cq->size - 1) *
 109                  (sizeof(*cq->queue) / 2)))->qp_err;
 110         } else {
 111                 cq->qp_errp = &((struct t4_status_page *)
 112                 ((u8 *)cq->queue + (cq->size - 1) *
 113                  sizeof(*cq->queue)))->qp_err;
 114         }
 115
 116         /* build fw_ri_res_wr */
 117         wr_len = sizeof(*res_wr) + sizeof(*res);
 118
 119         skb = alloc_skb(wr_len, GFP_KERNEL);
 120         if (!skb) {
 121                 ret = -ENOMEM;
 122                 goto err4;
 123         }
 124         set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
 125
 126         res_wr = __skb_put_zero(skb, wr_len);
 127         res_wr->op_nres = cpu_to_be32(
 128                         FW_WR_OP_V(FW_RI_RES_WR) |
 129                         FW_RI_RES_WR_NRES_V(1) |
 130                         FW_WR_COMPL_F);
 131         res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16));
 132         res_wr->cookie = (uintptr_t)wr_waitp;
 133         res = res_wr->res;
 134         res->u.cq.restype = FW_RI_RES_TYPE_CQ;
 135         res->u.cq.op = FW_RI_RES_OP_WRITE;
 136         res->u.cq.iqid = cpu_to_be32(cq->cqid);
 137         res->u.cq.iqandst_to_iqandstindex = cpu_to_be32(
 138                         FW_RI_RES_WR_IQANUS_V(0) |
 139                         FW_RI_RES_WR_IQANUD_V(1) |
 140                         FW_RI_RES_WR_IQANDST_F |
 141                         FW_RI_RES_WR_IQANDSTINDEX_V(
 142                                 rdev->lldi.ciq_ids[cq->vector]));
 143         res->u.cq.iqdroprss_to_iqesize = cpu_to_be16(
 144                         FW_RI_RES_WR_IQDROPRSS_F |
 145                         FW_RI_RES_WR_IQPCIECH_V(2) |
 146                         FW_RI_RES_WR_IQINTCNTTHRESH_V(0) |
 147                         FW_RI_RES_WR_IQO_F |
 148                         ((user && ucontext->is_32b_cqe) ?
 149                          FW_RI_RES_WR_IQESIZE_V(1) :
 150                          FW_RI_RES_WR_IQESIZE_V(2)));
 151         res->u.cq.iqsize = cpu_to_be16(cq->size);
 152         res->u.cq.iqaddr = cpu_to_be64(cq->dma_addr);
 153
 154         c4iw_init_wr_wait(wr_waitp);
 155         ret = c4iw_ref_send_wait(rdev, skb, wr_waitp, 0, 0, __func__);
 156         if (ret)
 157                 goto err4;
 158
 159         cq->gen = 1;
 160         cq->gts = rdev->lldi.gts_reg;
 161         cq->rdev = rdev;
 162
 163         cq->bar2_va = c4iw_bar2_addrs(rdev, cq->cqid, CXGB4_BAR2_QTYPE_INGRESS,
 164                                       &cq->bar2_qid,
 165                                       user ? &cq->bar2_pa : NULL);
 166         if (user && !cq->bar2_pa) {
 167                 pr_warn("%s: cqid %u not in BAR2 range\n",
 168                         pci_name(rdev->lldi.pdev), cq->cqid);
 169                 ret = -EINVAL;
 170                 goto err4;
 171         }
 172         return 0;
 173 err4:
 174         dma_free_coherent(&rdev->lldi.pdev->dev, cq->memsize, cq->queue,
 175                           dma_unmap_addr(cq, mapping));
 176 err3:
 177         kfree(cq->sw_queue);
 178 err2:
 179         c4iw_put_cqid(rdev, cq->cqid, uctx);
 180 err1:
 181         return ret;
 182 }
 183
 184 static void insert_recv_cqe(struct t4_wq *wq, struct t4_cq *cq, u32 srqidx)
 185 {
 186         struct t4_cqe cqe;
 187
 188         pr_debug("wq %p cq %p sw_cidx %u sw_pidx %u\n",
 189                  wq, cq, cq->sw_cidx, cq->sw_pidx);
 190         memset(&cqe, 0, sizeof(cqe));
 191         cqe.header = cpu_to_be32(CQE_STATUS_V(T4_ERR_SWFLUSH) |
 192                                  CQE_OPCODE_V(FW_RI_SEND) |
 193                                  CQE_TYPE_V(0) |
 194                                  CQE_SWCQE_V(1) |
 195                                  CQE_QPID_V(wq->sq.qid));
 196         cqe.bits_type_ts = cpu_to_be64(CQE_GENBIT_V((u64)cq->gen));
 197         if (srqidx)
 198                 cqe.u.srcqe.abs_rqe_idx = cpu_to_be32(srqidx);
 199         cq->sw_queue[cq->sw_pidx] = cqe;
 200         t4_swcq_produce(cq);
 201 }
 202
 203 int c4iw_flush_rq(struct t4_wq *wq, struct t4_cq *cq, int count)
 204 {
 205         int flushed = 0;
 206         int in_use = wq->rq.in_use - count;
 207
 208         pr_debug("wq %p cq %p rq.in_use %u skip count %u\n",
 209                  wq, cq, wq->rq.in_use, count);
 210         while (in_use--) {
 211                 insert_recv_cqe(wq, cq, 0);
 212                 flushed++;
 213         }
 214         return flushed;
 215 }
 216
 217 static void insert_sq_cqe(struct t4_wq *wq, struct t4_cq *cq,
 218                           struct t4_swsqe *swcqe)
 219 {
 220         struct t4_cqe cqe;
 221
 222         pr_debug("wq %p cq %p sw_cidx %u sw_pidx %u\n",
 223                  wq, cq, cq->sw_cidx, cq->sw_pidx);
 224         memset(&cqe, 0, sizeof(cqe));
 225         cqe.header = cpu_to_be32(CQE_STATUS_V(T4_ERR_SWFLUSH) |
 226                                  CQE_OPCODE_V(swcqe->opcode) |
 227                                  CQE_TYPE_V(1) |
 228                                  CQE_SWCQE_V(1) |
 229                                  CQE_QPID_V(wq->sq.qid));
 230         CQE_WRID_SQ_IDX(&cqe) = swcqe->idx;
 231         cqe.bits_type_ts = cpu_to_be64(CQE_GENBIT_V((u64)cq->gen));
 232         cq->sw_queue[cq->sw_pidx] = cqe;
 233         t4_swcq_produce(cq);
 234 }
 235
 236 static void advance_oldest_read(struct t4_wq *wq);
 237
 238 int c4iw_flush_sq(struct c4iw_qp *qhp)
 239 {
 240         int flushed = 0;
 241         struct t4_wq *wq = &qhp->wq;
 242         struct c4iw_cq *chp = to_c4iw_cq(qhp->ibqp.send_cq);
 243         struct t4_cq *cq = &chp->cq;
 244         int idx;
 245         struct t4_swsqe *swsqe;
 246
 247         if (wq->sq.flush_cidx == -1)
 248                 wq->sq.flush_cidx = wq->sq.cidx;
 249         idx = wq->sq.flush_cidx;
 250         while (idx != wq->sq.pidx) {
 251                 swsqe = &wq->sq.sw_sq[idx];
 252                 swsqe->flushed = 1;
 253                 insert_sq_cqe(wq, cq, swsqe);
 254                 if (wq->sq.oldest_read == swsqe) {
 255                         advance_oldest_read(wq);
 256                 }
 257                 flushed++;
 258                 if (++idx == wq->sq.size)
 259                         idx = 0;
 260         }
 261         wq->sq.flush_cidx += flushed;
 262         if (wq->sq.flush_cidx >= wq->sq.size)
 263                 wq->sq.flush_cidx -= wq->sq.size;
 264         return flushed;
 265 }
 266
 267 static void flush_completed_wrs(struct t4_wq *wq, struct t4_cq *cq)
 268 {
 269         struct t4_swsqe *swsqe;
 270         int cidx;
 271
 272         if (wq->sq.flush_cidx == -1)
 273                 wq->sq.flush_cidx = wq->sq.cidx;
 274         cidx = wq->sq.flush_cidx;
 275
 276         while (cidx != wq->sq.pidx) {
 277                 swsqe = &wq->sq.sw_sq[cidx];
 278                 if (!swsqe->signaled) {
 279                         if (++cidx == wq->sq.size)
 280                                 cidx = 0;
 281                 } else if (swsqe->complete) {
 282
 283                         /*
 284                          * Insert this completed cqe into the swcq.
 285                          */
 286                         pr_debug("moving cqe into swcq sq idx %u cq idx %u\n",
 287                                  cidx, cq->sw_pidx);
 288                         swsqe->cqe.header |= htonl(CQE_SWCQE_V(1));
 289                         cq->sw_queue[cq->sw_pidx] = swsqe->cqe;
 290                         t4_swcq_produce(cq);
 291                         swsqe->flushed = 1;
 292                         if (++cidx == wq->sq.size)
 293                                 cidx = 0;
 294                         wq->sq.flush_cidx = cidx;
 295                 } else
 296                         break;
 297         }
 298 }
 299
 300 static void create_read_req_cqe(struct t4_wq *wq, struct t4_cqe *hw_cqe,
 301                 struct t4_cqe *read_cqe)
 302 {
 303         read_cqe->u.scqe.cidx = wq->sq.oldest_read->idx;
 304         read_cqe->len = htonl(wq->sq.oldest_read->read_len);
 305         read_cqe->header = htonl(CQE_QPID_V(CQE_QPID(hw_cqe)) |
 306                         CQE_SWCQE_V(SW_CQE(hw_cqe)) |
 307                         CQE_OPCODE_V(FW_RI_READ_REQ) |
 308                         CQE_TYPE_V(1));
 309         read_cqe->bits_type_ts = hw_cqe->bits_type_ts;
 310 }
 311
 312 static void advance_oldest_read(struct t4_wq *wq)
 313 {
 314
 315         u32 rptr = wq->sq.oldest_read - wq->sq.sw_sq + 1;
 316
 317         if (rptr == wq->sq.size)
 318                 rptr = 0;
 319         while (rptr != wq->sq.pidx) {
 320                 wq->sq.oldest_read = &wq->sq.sw_sq[rptr];
 321
 322                 if (wq->sq.oldest_read->opcode == FW_RI_READ_REQ)
 323                         return;
 324                 if (++rptr == wq->sq.size)
 325                         rptr = 0;
 326         }
 327         wq->sq.oldest_read = NULL;
 328 }
 329
 330 /*
 331  * Move all CQEs from the HWCQ into the SWCQ.
 332  * Deal with out-of-order and/or completions that complete
 333  * prior unsignalled WRs.
 334  */
 335 void c4iw_flush_hw_cq(struct c4iw_cq *chp, struct c4iw_qp *flush_qhp)
 336 {
 337         struct t4_cqe *hw_cqe, *swcqe, read_cqe;
 338         struct c4iw_qp *qhp;
 339         struct t4_swsqe *swsqe;
 340         int ret;
 341
 342         pr_debug("cqid 0x%x\n", chp->cq.cqid);
 343         ret = t4_next_hw_cqe(&chp->cq, &hw_cqe);
 344
 345         /*
 346          * This logic is similar to poll_cq(), but not quite the same
 347          * unfortunately.  Need to move pertinent HW CQEs to the SW CQ but
 348          * also do any translation magic that poll_cq() normally does.
 349          */
 350         while (!ret) {
 351                 qhp = get_qhp(chp->rhp, CQE_QPID(hw_cqe));
 352
 353                 /*
 354                  * drop CQEs with no associated QP
 355                  */
 356                 if (qhp == NULL)
 357                         goto next_cqe;
 358
 359                 if (flush_qhp != qhp) {
 360                         spin_lock(&qhp->lock);
 361
 362                         if (qhp->wq.flushed == 1)
 363                                 goto next_cqe;
 364                 }
 365
 366                 if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE)
 367                         goto next_cqe;
 368
 369                 if (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP) {
 370
 371                         /* If we have reached here because of async
 372                          * event or other error, and have egress error
 373                          * then drop
 374                          */
 375                         if (CQE_TYPE(hw_cqe) == 1)
 376                                 goto next_cqe;
 377
 378                         /* drop peer2peer RTR reads.
 379                          */
 380                         if (CQE_WRID_STAG(hw_cqe) == 1)
 381                                 goto next_cqe;
 382
 383                         /*
 384                          * Eat completions for unsignaled read WRs.
 385                          */
 386                         if (!qhp->wq.sq.oldest_read->signaled) {
 387                                 advance_oldest_read(&qhp->wq);
 388                                 goto next_cqe;
 389                         }
 390
 391                         /*
 392                          * Don't write to the HWCQ, create a new read req CQE
 393                          * in local memory and move it into the swcq.
 394                          */
 395                         create_read_req_cqe(&qhp->wq, hw_cqe, &read_cqe);
 396                         hw_cqe = &read_cqe;
 397                         advance_oldest_read(&qhp->wq);
 398                 }
 399
 400                 /* if its a SQ completion, then do the magic to move all the
 401                  * unsignaled and now in-order completions into the swcq.
 402                  */
 403                 if (SQ_TYPE(hw_cqe)) {
 404                         swsqe = &qhp->wq.sq.sw_sq[CQE_WRID_SQ_IDX(hw_cqe)];
 405                         swsqe->cqe = *hw_cqe;
 406                         swsqe->complete = 1;
 407                         flush_completed_wrs(&qhp->wq, &chp->cq);
 408                 } else {
 409                         swcqe = &chp->cq.sw_queue[chp->cq.sw_pidx];
 410                         *swcqe = *hw_cqe;
 411                         swcqe->header |= cpu_to_be32(CQE_SWCQE_V(1));
 412                         t4_swcq_produce(&chp->cq);
 413                 }
 414 next_cqe:
 415                 t4_hwcq_consume(&chp->cq);
 416                 ret = t4_next_hw_cqe(&chp->cq, &hw_cqe);
 417                 if (qhp && flush_qhp != qhp)
 418                         spin_unlock(&qhp->lock);
 419         }
 420 }
 421
 422 static int cqe_completes_wr(struct t4_cqe *cqe, struct t4_wq *wq)
 423 {
 424         if (DRAIN_CQE(cqe)) {
 425                 WARN_ONCE(1, "Unexpected DRAIN CQE qp id %u!\n", wq->sq.qid);
 426                 return 0;
 427         }
 428
 429         if (CQE_OPCODE(cqe) == FW_RI_TERMINATE)
 430                 return 0;
 431
 432         if ((CQE_OPCODE(cqe) == FW_RI_RDMA_WRITE) && RQ_TYPE(cqe))
 433                 return 0;
 434
 435         if ((CQE_OPCODE(cqe) == FW_RI_READ_RESP) && SQ_TYPE(cqe))
 436                 return 0;
 437
 438         if (CQE_SEND_OPCODE(cqe) && RQ_TYPE(cqe) && t4_rq_empty(wq))
 439                 return 0;
 440         return 1;
 441 }
 442
 443 void c4iw_count_rcqes(struct t4_cq *cq, struct t4_wq *wq, int *count)
 444 {
 445         struct t4_cqe *cqe;
 446         u32 ptr;
 447
 448         *count = 0;
 449         pr_debug("count zero %d\n", *count);
 450         ptr = cq->sw_cidx;
 451         while (ptr != cq->sw_pidx) {
 452                 cqe = &cq->sw_queue[ptr];
 453                 if (RQ_TYPE(cqe) && (CQE_OPCODE(cqe) != FW_RI_READ_RESP) &&
 454                     (CQE_QPID(cqe) == wq->sq.qid) && cqe_completes_wr(cqe, wq))
 455                         (*count)++;
 456                 if (++ptr == cq->size)
 457                         ptr = 0;
 458         }
 459         pr_debug("cq %p count %d\n", cq, *count);
 460 }
 461
 462 static void post_pending_srq_wrs(struct t4_srq *srq)
 463 {
 464         struct t4_srq_pending_wr *pwr;
 465         u16 idx = 0;
 466
 467         while (srq->pending_in_use) {
 468                 pwr = &srq->pending_wrs[srq->pending_cidx];
 469                 srq->sw_rq[srq->pidx].wr_id = pwr->wr_id;
 470                 srq->sw_rq[srq->pidx].valid = 1;
 471
 472                 pr_debug("%s posting pending cidx %u pidx %u wq_pidx %u in_use %u rq_size %u wr_id %llx\n",
 473                          __func__,
 474                          srq->cidx, srq->pidx, srq->wq_pidx,
 475                          srq->in_use, srq->size,
 476                          (unsigned long long)pwr->wr_id);
 477
 478                 c4iw_copy_wr_to_srq(srq, &pwr->wqe, pwr->len16);
 479                 t4_srq_consume_pending_wr(srq);
 480                 t4_srq_produce(srq, pwr->len16);
 481                 idx += DIV_ROUND_UP(pwr->len16 * 16, T4_EQ_ENTRY_SIZE);
 482         }
 483
 484         if (idx) {
 485                 t4_ring_srq_db(srq, idx, pwr->len16, &pwr->wqe);
 486                 srq->queue[srq->size].status.host_wq_pidx =
 487                         srq->wq_pidx;
 488         }
 489 }
 490
 491 static u64 reap_srq_cqe(struct t4_cqe *hw_cqe, struct t4_srq *srq)
 492 {
 493         int rel_idx = CQE_ABS_RQE_IDX(hw_cqe) - srq->rqt_abs_idx;
 494         u64 wr_id;
 495
 496         srq->sw_rq[rel_idx].valid = 0;
 497         wr_id = srq->sw_rq[rel_idx].wr_id;
 498
 499         if (rel_idx == srq->cidx) {
 500                 pr_debug("%s in order cqe rel_idx %u cidx %u pidx %u wq_pidx %u in_use %u rq_size %u wr_id %llx\n",
 501                          __func__, rel_idx, srq->cidx, srq->pidx,
 502                          srq->wq_pidx, srq->in_use, srq->size,
 503                          (unsigned long long)srq->sw_rq[rel_idx].wr_id);
 504                 t4_srq_consume(srq);
 505                 while (srq->ooo_count && !srq->sw_rq[srq->cidx].valid) {
 506                         pr_debug("%s eat ooo cidx %u pidx %u wq_pidx %u in_use %u rq_size %u ooo_count %u wr_id %llx\n",
 507                                  __func__, srq->cidx, srq->pidx,
 508                                  srq->wq_pidx, srq->in_use,
 509                                  srq->size, srq->ooo_count,
 510                                  (unsigned long long)
 511                                  srq->sw_rq[srq->cidx].wr_id);
 512                         t4_srq_consume_ooo(srq);
 513                 }
 514                 if (srq->ooo_count == 0 && srq->pending_in_use)
 515                         post_pending_srq_wrs(srq);
 516         } else {
 517                 pr_debug("%s ooo cqe rel_idx %u cidx %u pidx %u wq_pidx %u in_use %u rq_size %u ooo_count %u wr_id %llx\n",
 518                          __func__, rel_idx, srq->cidx,
 519                          srq->pidx, srq->wq_pidx,
 520                          srq->in_use, srq->size,
 521                          srq->ooo_count,
 522                          (unsigned long long)srq->sw_rq[rel_idx].wr_id);
 523                 t4_srq_produce_ooo(srq);
 524         }
 525         return wr_id;
 526 }
 527
 528 /*
 529  * poll_cq
 530  *
 531  * Caller must:
 532  *     check the validity of the first CQE,
 533  *     supply the wq assicated with the qpid.
 534  *
 535  * credit: cq credit to return to sge.
 536  * cqe_flushed: 1 iff the CQE is flushed.
 537  * cqe: copy of the polled CQE.
 538  *
 539  * return value:
 540  *    0             CQE returned ok.
 541  *    -EAGAIN       CQE skipped, try again.
 542  *    -EOVERFLOW    CQ overflow detected.
 543  */
 544 static int poll_cq(struct t4_wq *wq, struct t4_cq *cq, struct t4_cqe *cqe,
 545                    u8 *cqe_flushed, u64 *cookie, u32 *credit,
 546                    struct t4_srq *srq)
 547 {
 548         int ret = 0;
 549         struct t4_cqe *hw_cqe, read_cqe;
 550
 551         *cqe_flushed = 0;
 552         *credit = 0;
 553         ret = t4_next_cqe(cq, &hw_cqe);
 554         if (ret)
 555                 return ret;
 556
 557         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",
 558                  CQE_OVFBIT(hw_cqe), CQE_QPID(hw_cqe),
 559                  CQE_GENBIT(hw_cqe), CQE_TYPE(hw_cqe), CQE_STATUS(hw_cqe),
 560                  CQE_OPCODE(hw_cqe), CQE_LEN(hw_cqe), CQE_WRID_HI(hw_cqe),
 561                  CQE_WRID_LOW(hw_cqe));
 562
 563         /*
 564          * skip cqe's not affiliated with a QP.
 565          */
 566         if (wq == NULL) {
 567                 ret = -EAGAIN;
 568                 goto skip_cqe;
 569         }
 570
 571         /*
 572         * skip hw cqe's if the wq is flushed.
 573         */
 574         if (wq->flushed && !SW_CQE(hw_cqe)) {
 575                 ret = -EAGAIN;
 576                 goto skip_cqe;
 577         }
 578
 579         /*
 580          * skip TERMINATE cqes...
 581          */
 582         if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE) {
 583                 ret = -EAGAIN;
 584                 goto skip_cqe;
 585         }
 586
 587         /*
 588          * Special cqe for drain WR completions...
 589          */
 590         if (DRAIN_CQE(hw_cqe)) {
 591                 *cookie = CQE_DRAIN_COOKIE(hw_cqe);
 592                 *cqe = *hw_cqe;
 593                 goto skip_cqe;
 594         }
 595
 596         /*
 597          * Gotta tweak READ completions:
 598          *      1) the cqe doesn't contain the sq_wptr from the wr.
 599          *      2) opcode not reflected from the wr.
 600          *      3) read_len not reflected from the wr.
 601          *      4) cq_type is RQ_TYPE not SQ_TYPE.
 602          */
 603         if (RQ_TYPE(hw_cqe) && (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP)) {
 604
 605                 /* If we have reached here because of async
 606                  * event or other error, and have egress error
 607                  * then drop
 608                  */
 609                 if (CQE_TYPE(hw_cqe) == 1) {
 610                         if (CQE_STATUS(hw_cqe))
 611                                 t4_set_wq_in_error(wq, 0);
 612                         ret = -EAGAIN;
 613                         goto skip_cqe;
 614                 }
 615
 616                 /* If this is an unsolicited read response, then the read
 617                  * was generated by the kernel driver as part of peer-2-peer
 618                  * connection setup.  So ignore the completion.
 619                  */
 620                 if (CQE_WRID_STAG(hw_cqe) == 1) {
 621                         if (CQE_STATUS(hw_cqe))
 622                                 t4_set_wq_in_error(wq, 0);
 623                         ret = -EAGAIN;
 624                         goto skip_cqe;
 625                 }
 626
 627                 /*
 628                  * Eat completions for unsignaled read WRs.
 629                  */
 630                 if (!wq->sq.oldest_read->signaled) {
 631                         advance_oldest_read(wq);
 632                         ret = -EAGAIN;
 633                         goto skip_cqe;
 634                 }
 635
 636                 /*
 637                  * Don't write to the HWCQ, so create a new read req CQE
 638                  * in local memory.
 639                  */
 640                 create_read_req_cqe(wq, hw_cqe, &read_cqe);
 641                 hw_cqe = &read_cqe;
 642                 advance_oldest_read(wq);
 643         }
 644
 645         if (CQE_STATUS(hw_cqe) || t4_wq_in_error(wq)) {
 646                 *cqe_flushed = (CQE_STATUS(hw_cqe) == T4_ERR_SWFLUSH);
 647                 t4_set_wq_in_error(wq, 0);
 648         }
 649
 650         /*
 651          * RECV completion.
 652          */
 653         if (RQ_TYPE(hw_cqe)) {
 654
 655                 /*
 656                  * HW only validates 4 bits of MSN.  So we must validate that
 657                  * the MSN in the SEND is the next expected MSN.  If its not,
 658                  * then we complete this with T4_ERR_MSN and mark the wq in
 659                  * error.
 660                  */
 661                 if (unlikely(!CQE_STATUS(hw_cqe) &&
 662                              CQE_WRID_MSN(hw_cqe) != wq->rq.msn)) {
 663                         t4_set_wq_in_error(wq, 0);
 664                         hw_cqe->header |= cpu_to_be32(CQE_STATUS_V(T4_ERR_MSN));
 665                 }
 666                 goto proc_cqe;
 667         }
 668
 669         /*
 670          * If we get here its a send completion.
 671          *
 672          * Handle out of order completion. These get stuffed
 673          * in the SW SQ. Then the SW SQ is walked to move any
 674          * now in-order completions into the SW CQ.  This handles
 675          * 2 cases:
 676          *      1) reaping unsignaled WRs when the first subsequent
 677          *         signaled WR is completed.
 678          *      2) out of order read completions.
 679          */
 680         if (!SW_CQE(hw_cqe) && (CQE_WRID_SQ_IDX(hw_cqe) != wq->sq.cidx)) {
 681                 struct t4_swsqe *swsqe;
 682
 683                 pr_debug("out of order completion going in sw_sq at idx %u\n",
 684                          CQE_WRID_SQ_IDX(hw_cqe));
 685                 swsqe = &wq->sq.sw_sq[CQE_WRID_SQ_IDX(hw_cqe)];
 686                 swsqe->cqe = *hw_cqe;
 687                 swsqe->complete = 1;
 688                 ret = -EAGAIN;
 689                 goto flush_wq;
 690         }
 691
 692 proc_cqe:
 693         *cqe = *hw_cqe;
 694
 695         /*
 696          * Reap the associated WR(s) that are freed up with this
 697          * completion.
 698          */
 699         if (SQ_TYPE(hw_cqe)) {
 700                 int idx = CQE_WRID_SQ_IDX(hw_cqe);
 701
 702                 /*
 703                 * Account for any unsignaled completions completed by
 704                 * this signaled completion.  In this case, cidx points
 705                 * to the first unsignaled one, and idx points to the
 706                 * signaled one.  So adjust in_use based on this delta.
 707                 * if this is not completing any unsigned wrs, then the
 708                 * delta will be 0. Handle wrapping also!
 709                 */
 710                 if (idx < wq->sq.cidx)
 711                         wq->sq.in_use -= wq->sq.size + idx - wq->sq.cidx;
 712                 else
 713                         wq->sq.in_use -= idx - wq->sq.cidx;
 714
 715                 wq->sq.cidx = (uint16_t)idx;
 716                 pr_debug("completing sq idx %u\n", wq->sq.cidx);
 717                 *cookie = wq->sq.sw_sq[wq->sq.cidx].wr_id;
 718                 if (c4iw_wr_log)
 719                         c4iw_log_wr_stats(wq, hw_cqe);
 720                 t4_sq_consume(wq);
 721         } else {
 722                 if (!srq) {
 723                         pr_debug("completing rq idx %u\n", wq->rq.cidx);
 724                         *cookie = wq->rq.sw_rq[wq->rq.cidx].wr_id;
 725                         if (c4iw_wr_log)
 726                                 c4iw_log_wr_stats(wq, hw_cqe);
 727                         t4_rq_consume(wq);
 728                 } else {
 729                         *cookie = reap_srq_cqe(hw_cqe, srq);
 730                 }
 731                 wq->rq.msn++;
 732                 goto skip_cqe;
 733         }
 734
 735 flush_wq:
 736         /*
 737          * Flush any completed cqes that are now in-order.
 738          */
 739         flush_completed_wrs(wq, cq);
 740
 741 skip_cqe:
 742         if (SW_CQE(hw_cqe)) {
 743                 pr_debug("cq %p cqid 0x%x skip sw cqe cidx %u\n",
 744                          cq, cq->cqid, cq->sw_cidx);
 745                 t4_swcq_consume(cq);
 746         } else {
 747                 pr_debug("cq %p cqid 0x%x skip hw cqe cidx %u\n",
 748                          cq, cq->cqid, cq->cidx);
 749                 t4_hwcq_consume(cq);
 750         }
 751         return ret;
 752 }
 753
 754 static int __c4iw_poll_cq_one(struct c4iw_cq *chp, struct c4iw_qp *qhp,
 755                               struct ib_wc *wc, struct c4iw_srq *srq)
 756 {
 757         struct t4_cqe cqe;
 758         struct t4_wq *wq = qhp ? &qhp->wq : NULL;
 759         u32 credit = 0;
 760         u8 cqe_flushed;
 761         u64 cookie = 0;
 762         int ret;
 763
 764         ret = poll_cq(wq, &(chp->cq), &cqe, &cqe_flushed, &cookie, &credit,
 765                       srq ? &srq->wq : NULL);
 766         if (ret)
 767                 goto out;
 768
 769         wc->wr_id = cookie;
 770         wc->qp = qhp ? &qhp->ibqp : NULL;
 771         wc->vendor_err = CQE_STATUS(&cqe);
 772         wc->wc_flags = 0;
 773
 774         /*
 775          * Simulate a SRQ_LIMIT_REACHED HW notification if required.
 776          */
 777         if (srq && !(srq->flags & T4_SRQ_LIMIT_SUPPORT) && srq->armed &&
 778             srq->wq.in_use < srq->srq_limit)
 779                 c4iw_dispatch_srq_limit_reached_event(srq);
 780
 781         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",
 782                  CQE_QPID(&cqe),
 783                  CQE_TYPE(&cqe), CQE_OPCODE(&cqe),
 784                  CQE_STATUS(&cqe), CQE_LEN(&cqe),
 785                  CQE_WRID_HI(&cqe), CQE_WRID_LOW(&cqe),
 786                  (unsigned long long)cookie);
 787
 788         if (CQE_TYPE(&cqe) == 0) {
 789                 if (!CQE_STATUS(&cqe))
 790                         wc->byte_len = CQE_LEN(&cqe);
 791                 else
 792                         wc->byte_len = 0;
 793
 794                 switch (CQE_OPCODE(&cqe)) {
 795                 case FW_RI_SEND:
 796                         wc->opcode = IB_WC_RECV;
 797                         break;
 798                 case FW_RI_SEND_WITH_INV:
 799                 case FW_RI_SEND_WITH_SE_INV:
 800                         wc->opcode = IB_WC_RECV;
 801                         wc->ex.invalidate_rkey = CQE_WRID_STAG(&cqe);
 802                         wc->wc_flags |= IB_WC_WITH_INVALIDATE;
 803                         c4iw_invalidate_mr(qhp->rhp, wc->ex.invalidate_rkey);
 804                         break;
 805                 case FW_RI_WRITE_IMMEDIATE:
 806                         wc->opcode = IB_WC_RECV_RDMA_WITH_IMM;
 807                         wc->ex.imm_data = CQE_IMM_DATA(&cqe);
 808                         wc->wc_flags |= IB_WC_WITH_IMM;
 809                         break;
 810                 default:
 811                         pr_err("Unexpected opcode %d in the CQE received for QPID=0x%0x\n",
 812                                CQE_OPCODE(&cqe), CQE_QPID(&cqe));
 813                         ret = -EINVAL;
 814                         goto out;
 815                 }
 816         } else {
 817                 switch (CQE_OPCODE(&cqe)) {
 818                 case FW_RI_WRITE_IMMEDIATE:
 819                 case FW_RI_RDMA_WRITE:
 820                         wc->opcode = IB_WC_RDMA_WRITE;
 821                         break;
 822                 case FW_RI_READ_REQ:
 823                         wc->opcode = IB_WC_RDMA_READ;
 824                         wc->byte_len = CQE_LEN(&cqe);
 825                         break;
 826                 case FW_RI_SEND_WITH_INV:
 827                 case FW_RI_SEND_WITH_SE_INV:
 828                         wc->opcode = IB_WC_SEND;
 829                         wc->wc_flags |= IB_WC_WITH_INVALIDATE;
 830                         break;
 831                 case FW_RI_SEND:
 832                 case FW_RI_SEND_WITH_SE:
 833                         wc->opcode = IB_WC_SEND;
 834                         break;
 835
 836                 case FW_RI_LOCAL_INV:
 837                         wc->opcode = IB_WC_LOCAL_INV;
 838                         break;
 839                 case FW_RI_FAST_REGISTER:
 840                         wc->opcode = IB_WC_REG_MR;
 841
 842                         /* Invalidate the MR if the fastreg failed */
 843                         if (CQE_STATUS(&cqe) != T4_ERR_SUCCESS)
 844                                 c4iw_invalidate_mr(qhp->rhp,
 845                                                    CQE_WRID_FR_STAG(&cqe));
 846                         break;
 847                 default:
 848                         pr_err("Unexpected opcode %d in the CQE received for QPID=0x%0x\n",
 849                                CQE_OPCODE(&cqe), CQE_QPID(&cqe));
 850                         ret = -EINVAL;
 851                         goto out;
 852                 }
 853         }
 854
 855         if (cqe_flushed)
 856                 wc->status = IB_WC_WR_FLUSH_ERR;
 857         else {
 858
 859                 switch (CQE_STATUS(&cqe)) {
 860                 case T4_ERR_SUCCESS:
 861                         wc->status = IB_WC_SUCCESS;
 862                         break;
 863                 case T4_ERR_STAG:
 864                         wc->status = IB_WC_LOC_ACCESS_ERR;
 865                         break;
 866                 case T4_ERR_PDID:
 867                         wc->status = IB_WC_LOC_PROT_ERR;
 868                         break;
 869                 case T4_ERR_QPID:
 870                 case T4_ERR_ACCESS:
 871                         wc->status = IB_WC_LOC_ACCESS_ERR;
 872                         break;
 873                 case T4_ERR_WRAP:
 874                         wc->status = IB_WC_GENERAL_ERR;
 875                         break;
 876                 case T4_ERR_BOUND:
 877                         wc->status = IB_WC_LOC_LEN_ERR;
 878                         break;
 879                 case T4_ERR_INVALIDATE_SHARED_MR:
 880                 case T4_ERR_INVALIDATE_MR_WITH_MW_BOUND:
 881                         wc->status = IB_WC_MW_BIND_ERR;
 882                         break;
 883                 case T4_ERR_CRC:
 884                 case T4_ERR_MARKER:
 885                 case T4_ERR_PDU_LEN_ERR:
 886                 case T4_ERR_OUT_OF_RQE:
 887                 case T4_ERR_DDP_VERSION:
 888                 case T4_ERR_RDMA_VERSION:
 889                 case T4_ERR_DDP_QUEUE_NUM:
 890                 case T4_ERR_MSN:
 891                 case T4_ERR_TBIT:
 892                 case T4_ERR_MO:
 893                 case T4_ERR_MSN_RANGE:
 894                 case T4_ERR_IRD_OVERFLOW:
 895                 case T4_ERR_OPCODE:
 896                 case T4_ERR_INTERNAL_ERR:
 897                         wc->status = IB_WC_FATAL_ERR;
 898                         break;
 899                 case T4_ERR_SWFLUSH:
 900                         wc->status = IB_WC_WR_FLUSH_ERR;
 901                         break;
 902                 default:
 903                         pr_err("Unexpected cqe_status 0x%x for QPID=0x%0x\n",
 904                                CQE_STATUS(&cqe), CQE_QPID(&cqe));
 905                         wc->status = IB_WC_FATAL_ERR;
 906                 }
 907         }
 908 out:
 909         return ret;
 910 }
 911
 912 /*
 913  * Get one cq entry from c4iw and map it to openib.
 914  *
 915  * Returns:
 916  *      0                       cqe returned
 917  *      -ENODATA                EMPTY;
 918  *      -EAGAIN                 caller must try again
 919  *      any other -errno        fatal error
 920  */
 921 static int c4iw_poll_cq_one(struct c4iw_cq *chp, struct ib_wc *wc)
 922 {
 923         struct c4iw_srq *srq = NULL;
 924         struct c4iw_qp *qhp = NULL;
 925         struct t4_cqe *rd_cqe;
 926         int ret;
 927
 928         ret = t4_next_cqe(&chp->cq, &rd_cqe);
 929
 930         if (ret)
 931                 return ret;
 932
 933         qhp = get_qhp(chp->rhp, CQE_QPID(rd_cqe));
 934         if (qhp) {
 935                 spin_lock(&qhp->lock);
 936                 srq = qhp->srq;
 937                 if (srq)
 938                         spin_lock(&srq->lock);
 939                 ret = __c4iw_poll_cq_one(chp, qhp, wc, srq);
 940                 spin_unlock(&qhp->lock);
 941                 if (srq)
 942                         spin_unlock(&srq->lock);
 943         } else {
 944                 ret = __c4iw_poll_cq_one(chp, NULL, wc, NULL);
 945         }
 946         return ret;
 947 }
 948
 949 int c4iw_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 950 {
 951         struct c4iw_cq *chp;
 952         unsigned long flags;
 953         int npolled;
 954         int err = 0;
 955
 956         chp = to_c4iw_cq(ibcq);
 957
 958         spin_lock_irqsave(&chp->lock, flags);
 959         for (npolled = 0; npolled < num_entries; ++npolled) {
 960                 do {
 961                         err = c4iw_poll_cq_one(chp, wc + npolled);
 962                 } while (err == -EAGAIN);
 963                 if (err)
 964                         break;
 965         }
 966         spin_unlock_irqrestore(&chp->lock, flags);
 967         return !err || err == -ENODATA ? npolled : err;
 968 }
 969
 970 void c4iw_cq_rem_ref(struct c4iw_cq *chp)
 971 {
 972         if (refcount_dec_and_test(&chp->refcnt))
 973                 complete(&chp->cq_rel_comp);
 974 }
 975
 976 int c4iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 977 {
 978         struct c4iw_cq *chp;
 979         struct c4iw_ucontext *ucontext;
 980
 981         pr_debug("ib_cq %p\n", ib_cq);
 982         chp = to_c4iw_cq(ib_cq);
 983
 984         xa_erase_irq(&chp->rhp->cqs, chp->cq.cqid);
 985         c4iw_cq_rem_ref(chp);
 986         wait_for_completion(&chp->cq_rel_comp);
 987
 988         ucontext = rdma_udata_to_drv_context(udata, struct c4iw_ucontext,
 989                                              ibucontext);
 990         destroy_cq(&chp->rhp->rdev, &chp->cq,
 991                    ucontext ? &ucontext->uctx : &chp->cq.rdev->uctx,
 992                    chp->destroy_skb, chp->wr_waitp);
 993         c4iw_put_wr_wait(chp->wr_waitp);
 994         return 0;
 995 }
 996
 997 int c4iw_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 998                    struct ib_udata *udata)
 999 {
1000         struct ib_device *ibdev = ibcq->device;
1001         int entries = attr->cqe;
1002         int vector = attr->comp_vector;
1003         struct c4iw_dev *rhp = to_c4iw_dev(ibcq->device);
1004         struct c4iw_cq *chp = to_c4iw_cq(ibcq);
1005         struct c4iw_create_cq ucmd;
1006         struct c4iw_create_cq_resp uresp;
1007         int ret, wr_len;
1008         size_t memsize, hwentries;
1009         struct c4iw_mm_entry *mm, *mm2;
1010         struct c4iw_ucontext *ucontext = rdma_udata_to_drv_context(
1011                 udata, struct c4iw_ucontext, ibucontext);
1012
1013         pr_debug("ib_dev %p entries %d\n", ibdev, entries);
1014         if (attr->flags)
1015                 return -EOPNOTSUPP;
1016
1017         if (entries < 1 || entries > ibdev->attrs.max_cqe)
1018                 return -EINVAL;
1019
1020         if (vector >= rhp->rdev.lldi.nciq)
1021                 return -EINVAL;
1022
1023         if (udata) {
1024                 if (udata->inlen < sizeof(ucmd))
1025                         ucontext->is_32b_cqe = 1;
1026         }
1027
1028         chp->wr_waitp = c4iw_alloc_wr_wait(GFP_KERNEL);
1029         if (!chp->wr_waitp) {
1030                 ret = -ENOMEM;
1031                 goto err_free_chp;
1032         }
1033         c4iw_init_wr_wait(chp->wr_waitp);
1034
1035         wr_len = sizeof(struct fw_ri_res_wr) + sizeof(struct fw_ri_res);
1036         chp->destroy_skb = alloc_skb(wr_len, GFP_KERNEL);
1037         if (!chp->destroy_skb) {
1038                 ret = -ENOMEM;
1039                 goto err_free_wr_wait;
1040         }
1041
1042         /* account for the status page. */
1043         entries++;
1044
1045         /* IQ needs one extra entry to differentiate full vs empty. */
1046         entries++;
1047
1048         /*
1049          * entries must be multiple of 16 for HW.
1050          */
1051         entries = roundup(entries, 16);
1052
1053         /*
1054          * Make actual HW queue 2x to avoid cdix_inc overflows.
1055          */
1056         hwentries = min(entries * 2, rhp->rdev.hw_queue.t4_max_iq_size);
1057
1058         /*
1059          * Make HW queue at least 64 entries so GTS updates aren't too
1060          * frequent.
1061          */
1062         if (hwentries < 64)
1063                 hwentries = 64;
1064
1065         memsize = hwentries * ((ucontext && ucontext->is_32b_cqe) ?
1066                         (sizeof(*chp->cq.queue) / 2) : sizeof(*chp->cq.queue));
1067
1068         /*
1069          * memsize must be a multiple of the page size if its a user cq.
1070          */
1071         if (udata)
1072                 memsize = roundup(memsize, PAGE_SIZE);
1073
1074         chp->cq.size = hwentries;
1075         chp->cq.memsize = memsize;
1076         chp->cq.vector = vector;
1077
1078         ret = create_cq(&rhp->rdev, &chp->cq,
1079                         ucontext ? &ucontext->uctx : &rhp->rdev.uctx,
1080                         chp->wr_waitp);
1081         if (ret)
1082                 goto err_free_skb;
1083
1084         chp->rhp = rhp;
1085         chp->cq.size--;                         /* status page */
1086         chp->ibcq.cqe = entries - 2;
1087         spin_lock_init(&chp->lock);
1088         spin_lock_init(&chp->comp_handler_lock);
1089         refcount_set(&chp->refcnt, 1);
1090         init_completion(&chp->cq_rel_comp);
1091         ret = xa_insert_irq(&rhp->cqs, chp->cq.cqid, chp, GFP_KERNEL);
1092         if (ret)
1093                 goto err_destroy_cq;
1094
1095         if (ucontext) {
1096                 ret = -ENOMEM;
1097                 mm = kmalloc(sizeof(*mm), GFP_KERNEL);
1098                 if (!mm)
1099                         goto err_remove_handle;
1100                 mm2 = kmalloc(sizeof(*mm2), GFP_KERNEL);
1101                 if (!mm2)
1102                         goto err_free_mm;
1103
1104                 memset(&uresp, 0, sizeof(uresp));
1105                 uresp.qid_mask = rhp->rdev.cqmask;
1106                 uresp.cqid = chp->cq.cqid;
1107                 uresp.size = chp->cq.size;
1108                 uresp.memsize = chp->cq.memsize;
1109                 spin_lock(&ucontext->mmap_lock);
1110                 uresp.key = ucontext->key;
1111                 ucontext->key += PAGE_SIZE;
1112                 uresp.gts_key = ucontext->key;
1113                 ucontext->key += PAGE_SIZE;
1114                 /* communicate to the userspace that
1115                  * kernel driver supports 64B CQE
1116                  */
1117                 uresp.flags |= C4IW_64B_CQE;
1118
1119                 spin_unlock(&ucontext->mmap_lock);
1120                 ret = ib_copy_to_udata(udata, &uresp,
1121                                        ucontext->is_32b_cqe ?
1122                                        sizeof(uresp) - sizeof(uresp.flags) :
1123                                        sizeof(uresp));
1124                 if (ret)
1125                         goto err_free_mm2;
1126
1127                 mm->key = uresp.key;
1128                 mm->addr = virt_to_phys(chp->cq.queue);
1129                 mm->len = chp->cq.memsize;
1130                 insert_mmap(ucontext, mm);
1131
1132                 mm2->key = uresp.gts_key;
1133                 mm2->addr = chp->cq.bar2_pa;
1134                 mm2->len = PAGE_SIZE;
1135                 insert_mmap(ucontext, mm2);
1136         }
1137
1138         pr_debug("cqid 0x%0x chp %p size %u memsize %zu, dma_addr %pad\n",
1139                  chp->cq.cqid, chp, chp->cq.size, chp->cq.memsize,
1140                  &chp->cq.dma_addr);
1141         return 0;
1142 err_free_mm2:
1143         kfree(mm2);
1144 err_free_mm:
1145         kfree(mm);
1146 err_remove_handle:
1147         xa_erase_irq(&rhp->cqs, chp->cq.cqid);
1148 err_destroy_cq:
1149         destroy_cq(&chp->rhp->rdev, &chp->cq,
1150                    ucontext ? &ucontext->uctx : &rhp->rdev.uctx,
1151                    chp->destroy_skb, chp->wr_waitp);
1152 err_free_skb:
1153         kfree_skb(chp->destroy_skb);
1154 err_free_wr_wait:
1155         c4iw_put_wr_wait(chp->wr_waitp);
1156 err_free_chp:
1157         return ret;
1158 }
1159
1160 int c4iw_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
1161 {
1162         struct c4iw_cq *chp;
1163         int ret = 0;
1164         unsigned long flag;
1165
1166         chp = to_c4iw_cq(ibcq);
1167         spin_lock_irqsave(&chp->lock, flag);
1168         t4_arm_cq(&chp->cq,
1169                   (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED);
1170         if (flags & IB_CQ_REPORT_MISSED_EVENTS)
1171                 ret = t4_cq_notempty(&chp->cq);
1172         spin_unlock_irqrestore(&chp->lock, flag);
1173         return ret;
1174 }
1175
1176 void c4iw_flush_srqidx(struct c4iw_qp *qhp, u32 srqidx)
1177 {
1178         struct c4iw_cq *rchp = to_c4iw_cq(qhp->ibqp.recv_cq);
1179         unsigned long flag;
1180
1181         /* locking heirarchy: cq lock first, then qp lock. */
1182         spin_lock_irqsave(&rchp->lock, flag);
1183         spin_lock(&qhp->lock);
1184
1185         /* create a SRQ RECV CQE for srqidx */
1186         insert_recv_cqe(&qhp->wq, &rchp->cq, srqidx);
1187
1188         spin_unlock(&qhp->lock);
1189         spin_unlock_irqrestore(&rchp->lock, flag);
1190 }