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 {
  38         struct fw_ri_res_wr *res_wr;
  39         struct fw_ri_res *res;
  40         int wr_len;
  41         struct c4iw_wr_wait wr_wait;
  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 = (struct fw_ri_res_wr *)__skb_put(skb, wr_len);
  48         memset(res_wr, 0, 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_wait;
  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_wait);
  61         ret = c4iw_ofld_send(rdev, skb);
  62         if (!ret) {
  63                 ret = c4iw_wait_for_reply(rdev, &wr_wait, 0, 0, __func__);
  64         }
  65
  66         kfree(cq->sw_queue);
  67         dma_free_coherent(&(rdev->lldi.pdev->dev),
  68                           cq->memsize, cq->queue,
  69                           dma_unmap_addr(cq, mapping));
  70         c4iw_put_cqid(rdev, cq->cqid, uctx);
  71         return ret;
  72 }
  73
  74 static int create_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
  75                      struct c4iw_dev_ucontext *uctx)
  76 {
  77         struct fw_ri_res_wr *res_wr;
  78         struct fw_ri_res *res;
  79         int wr_len;
  80         int user = (uctx != &rdev->uctx);
  81         struct c4iw_wr_wait wr_wait;
  82         int ret;
  83         struct sk_buff *skb;
  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         memset(cq->queue, 0, cq->memsize);
 106
 107         /* build fw_ri_res_wr */
 108         wr_len = sizeof *res_wr + sizeof *res;
 109
 110         skb = alloc_skb(wr_len, GFP_KERNEL);
 111         if (!skb) {
 112                 ret = -ENOMEM;
 113                 goto err4;
 114         }
 115         set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
 116
 117         res_wr = (struct fw_ri_res_wr *)__skb_put(skb, wr_len);
 118         memset(res_wr, 0, wr_len);
 119         res_wr->op_nres = cpu_to_be32(
 120                         FW_WR_OP_V(FW_RI_RES_WR) |
 121                         FW_RI_RES_WR_NRES_V(1) |
 122                         FW_WR_COMPL_F);
 123         res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16));
 124         res_wr->cookie = (uintptr_t)&wr_wait;
 125         res = res_wr->res;
 126         res->u.cq.restype = FW_RI_RES_TYPE_CQ;
 127         res->u.cq.op = FW_RI_RES_OP_WRITE;
 128         res->u.cq.iqid = cpu_to_be32(cq->cqid);
 129         res->u.cq.iqandst_to_iqandstindex = cpu_to_be32(
 130                         FW_RI_RES_WR_IQANUS_V(0) |
 131                         FW_RI_RES_WR_IQANUD_V(1) |
 132                         FW_RI_RES_WR_IQANDST_F |
 133                         FW_RI_RES_WR_IQANDSTINDEX_V(
 134                                 rdev->lldi.ciq_ids[cq->vector]));
 135         res->u.cq.iqdroprss_to_iqesize = cpu_to_be16(
 136                         FW_RI_RES_WR_IQDROPRSS_F |
 137                         FW_RI_RES_WR_IQPCIECH_V(2) |
 138                         FW_RI_RES_WR_IQINTCNTTHRESH_V(0) |
 139                         FW_RI_RES_WR_IQO_F |
 140                         FW_RI_RES_WR_IQESIZE_V(1));
 141         res->u.cq.iqsize = cpu_to_be16(cq->size);
 142         res->u.cq.iqaddr = cpu_to_be64(cq->dma_addr);
 143
 144         c4iw_init_wr_wait(&wr_wait);
 145
 146         ret = c4iw_ofld_send(rdev, skb);
 147         if (ret)
 148                 goto err4;
 149         PDBG("%s wait_event wr_wait %p\n", __func__, &wr_wait);
 150         ret = c4iw_wait_for_reply(rdev, &wr_wait, 0, 0, __func__);
 151         if (ret)
 152                 goto err4;
 153
 154         cq->gen = 1;
 155         cq->gts = rdev->lldi.gts_reg;
 156         cq->rdev = rdev;
 157
 158         cq->bar2_va = c4iw_bar2_addrs(rdev, cq->cqid, T4_BAR2_QTYPE_INGRESS,
 159                                       &cq->bar2_qid,
 160                                       user ? &cq->bar2_pa : NULL);
 161         if (user && !cq->bar2_pa) {
 162                 pr_warn(MOD "%s: cqid %u not in BAR2 range.\n",
 163                         pci_name(rdev->lldi.pdev), cq->cqid);
 164                 ret = -EINVAL;
 165                 goto err4;
 166         }
 167         return 0;
 168 err4:
 169         dma_free_coherent(&rdev->lldi.pdev->dev, cq->memsize, cq->queue,
 170                           dma_unmap_addr(cq, mapping));
 171 err3:
 172         kfree(cq->sw_queue);
 173 err2:
 174         c4iw_put_cqid(rdev, cq->cqid, uctx);
 175 err1:
 176         return ret;
 177 }
 178
 179 static void insert_recv_cqe(struct t4_wq *wq, struct t4_cq *cq)
 180 {
 181         struct t4_cqe cqe;
 182
 183         PDBG("%s wq %p cq %p sw_cidx %u sw_pidx %u\n", __func__,
 184              wq, cq, cq->sw_cidx, cq->sw_pidx);
 185         memset(&cqe, 0, sizeof(cqe));
 186         cqe.header = cpu_to_be32(CQE_STATUS_V(T4_ERR_SWFLUSH) |
 187                                  CQE_OPCODE_V(FW_RI_SEND) |
 188                                  CQE_TYPE_V(0) |
 189                                  CQE_SWCQE_V(1) |
 190                                  CQE_QPID_V(wq->sq.qid));
 191         cqe.bits_type_ts = cpu_to_be64(CQE_GENBIT_V((u64)cq->gen));
 192         cq->sw_queue[cq->sw_pidx] = cqe;
 193         t4_swcq_produce(cq);
 194 }
 195
 196 int c4iw_flush_rq(struct t4_wq *wq, struct t4_cq *cq, int count)
 197 {
 198         int flushed = 0;
 199         int in_use = wq->rq.in_use - count;
 200
 201         BUG_ON(in_use < 0);
 202         PDBG("%s wq %p cq %p rq.in_use %u skip count %u\n", __func__,
 203              wq, cq, wq->rq.in_use, count);
 204         while (in_use--) {
 205                 insert_recv_cqe(wq, cq);
 206                 flushed++;
 207         }
 208         return flushed;
 209 }
 210
 211 static void insert_sq_cqe(struct t4_wq *wq, struct t4_cq *cq,
 212                           struct t4_swsqe *swcqe)
 213 {
 214         struct t4_cqe cqe;
 215
 216         PDBG("%s wq %p cq %p sw_cidx %u sw_pidx %u\n", __func__,
 217              wq, cq, cq->sw_cidx, cq->sw_pidx);
 218         memset(&cqe, 0, sizeof(cqe));
 219         cqe.header = cpu_to_be32(CQE_STATUS_V(T4_ERR_SWFLUSH) |
 220                                  CQE_OPCODE_V(swcqe->opcode) |
 221                                  CQE_TYPE_V(1) |
 222                                  CQE_SWCQE_V(1) |
 223                                  CQE_QPID_V(wq->sq.qid));
 224         CQE_WRID_SQ_IDX(&cqe) = swcqe->idx;
 225         cqe.bits_type_ts = cpu_to_be64(CQE_GENBIT_V((u64)cq->gen));
 226         cq->sw_queue[cq->sw_pidx] = cqe;
 227         t4_swcq_produce(cq);
 228 }
 229
 230 static void advance_oldest_read(struct t4_wq *wq);
 231
 232 int c4iw_flush_sq(struct c4iw_qp *qhp)
 233 {
 234         int flushed = 0;
 235         struct t4_wq *wq = &qhp->wq;
 236         struct c4iw_cq *chp = to_c4iw_cq(qhp->ibqp.send_cq);
 237         struct t4_cq *cq = &chp->cq;
 238         int idx;
 239         struct t4_swsqe *swsqe;
 240
 241         if (wq->sq.flush_cidx == -1)
 242                 wq->sq.flush_cidx = wq->sq.cidx;
 243         idx = wq->sq.flush_cidx;
 244         BUG_ON(idx >= wq->sq.size);
 245         while (idx != wq->sq.pidx) {
 246                 swsqe = &wq->sq.sw_sq[idx];
 247                 BUG_ON(swsqe->flushed);
 248                 swsqe->flushed = 1;
 249                 insert_sq_cqe(wq, cq, swsqe);
 250                 if (wq->sq.oldest_read == swsqe) {
 251                         BUG_ON(swsqe->opcode != FW_RI_READ_REQ);
 252                         advance_oldest_read(wq);
 253                 }
 254                 flushed++;
 255                 if (++idx == wq->sq.size)
 256                         idx = 0;
 257         }
 258         wq->sq.flush_cidx += flushed;
 259         if (wq->sq.flush_cidx >= wq->sq.size)
 260                 wq->sq.flush_cidx -= wq->sq.size;
 261         return flushed;
 262 }
 263
 264 static void flush_completed_wrs(struct t4_wq *wq, struct t4_cq *cq)
 265 {
 266         struct t4_swsqe *swsqe;
 267         int cidx;
 268
 269         if (wq->sq.flush_cidx == -1)
 270                 wq->sq.flush_cidx = wq->sq.cidx;
 271         cidx = wq->sq.flush_cidx;
 272         BUG_ON(cidx > wq->sq.size);
 273
 274         while (cidx != wq->sq.pidx) {
 275                 swsqe = &wq->sq.sw_sq[cidx];
 276                 if (!swsqe->signaled) {
 277                         if (++cidx == wq->sq.size)
 278                                 cidx = 0;
 279                 } else if (swsqe->complete) {
 280
 281                         BUG_ON(swsqe->flushed);
 282
 283                         /*
 284                          * Insert this completed cqe into the swcq.
 285                          */
 286                         PDBG("%s moving cqe into swcq sq idx %u cq idx %u\n",
 287                                         __func__, 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)
 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         PDBG("%s  cqid 0x%x\n", __func__, 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 (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE)
 360                         goto next_cqe;
 361
 362                 if (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP) {
 363
 364                         /* If we have reached here because of async
 365                          * event or other error, and have egress error
 366                          * then drop
 367                          */
 368                         if (CQE_TYPE(hw_cqe) == 1)
 369                                 goto next_cqe;
 370
 371                         /* drop peer2peer RTR reads.
 372                          */
 373                         if (CQE_WRID_STAG(hw_cqe) == 1)
 374                                 goto next_cqe;
 375
 376                         /*
 377                          * Eat completions for unsignaled read WRs.
 378                          */
 379                         if (!qhp->wq.sq.oldest_read->signaled) {
 380                                 advance_oldest_read(&qhp->wq);
 381                                 goto next_cqe;
 382                         }
 383
 384                         /*
 385                          * Don't write to the HWCQ, create a new read req CQE
 386                          * in local memory and move it into the swcq.
 387                          */
 388                         create_read_req_cqe(&qhp->wq, hw_cqe, &read_cqe);
 389                         hw_cqe = &read_cqe;
 390                         advance_oldest_read(&qhp->wq);
 391                 }
 392
 393                 /* if its a SQ completion, then do the magic to move all the
 394                  * unsignaled and now in-order completions into the swcq.
 395                  */
 396                 if (SQ_TYPE(hw_cqe)) {
 397                         swsqe = &qhp->wq.sq.sw_sq[CQE_WRID_SQ_IDX(hw_cqe)];
 398                         swsqe->cqe = *hw_cqe;
 399                         swsqe->complete = 1;
 400                         flush_completed_wrs(&qhp->wq, &chp->cq);
 401                 } else {
 402                         swcqe = &chp->cq.sw_queue[chp->cq.sw_pidx];
 403                         *swcqe = *hw_cqe;
 404                         swcqe->header |= cpu_to_be32(CQE_SWCQE_V(1));
 405                         t4_swcq_produce(&chp->cq);
 406                 }
 407 next_cqe:
 408                 t4_hwcq_consume(&chp->cq);
 409                 ret = t4_next_hw_cqe(&chp->cq, &hw_cqe);
 410         }
 411 }
 412
 413 static int cqe_completes_wr(struct t4_cqe *cqe, struct t4_wq *wq)
 414 {
 415         if (CQE_OPCODE(cqe) == FW_RI_TERMINATE)
 416                 return 0;
 417
 418         if ((CQE_OPCODE(cqe) == FW_RI_RDMA_WRITE) && RQ_TYPE(cqe))
 419                 return 0;
 420
 421         if ((CQE_OPCODE(cqe) == FW_RI_READ_RESP) && SQ_TYPE(cqe))
 422                 return 0;
 423
 424         if (CQE_SEND_OPCODE(cqe) && RQ_TYPE(cqe) && t4_rq_empty(wq))
 425                 return 0;
 426         return 1;
 427 }
 428
 429 void c4iw_count_rcqes(struct t4_cq *cq, struct t4_wq *wq, int *count)
 430 {
 431         struct t4_cqe *cqe;
 432         u32 ptr;
 433
 434         *count = 0;
 435         PDBG("%s count zero %d\n", __func__, *count);
 436         ptr = cq->sw_cidx;
 437         while (ptr != cq->sw_pidx) {
 438                 cqe = &cq->sw_queue[ptr];
 439                 if (RQ_TYPE(cqe) && (CQE_OPCODE(cqe) != FW_RI_READ_RESP) &&
 440                     (CQE_QPID(cqe) == wq->sq.qid) && cqe_completes_wr(cqe, wq))
 441                         (*count)++;
 442                 if (++ptr == cq->size)
 443                         ptr = 0;
 444         }
 445         PDBG("%s cq %p count %d\n", __func__, cq, *count);
 446 }
 447
 448 /*
 449  * poll_cq
 450  *
 451  * Caller must:
 452  *     check the validity of the first CQE,
 453  *     supply the wq assicated with the qpid.
 454  *
 455  * credit: cq credit to return to sge.
 456  * cqe_flushed: 1 iff the CQE is flushed.
 457  * cqe: copy of the polled CQE.
 458  *
 459  * return value:
 460  *    0             CQE returned ok.
 461  *    -EAGAIN       CQE skipped, try again.
 462  *    -EOVERFLOW    CQ overflow detected.
 463  */
 464 static int poll_cq(struct t4_wq *wq, struct t4_cq *cq, struct t4_cqe *cqe,
 465                    u8 *cqe_flushed, u64 *cookie, u32 *credit)
 466 {
 467         int ret = 0;
 468         struct t4_cqe *hw_cqe, read_cqe;
 469
 470         *cqe_flushed = 0;
 471         *credit = 0;
 472         ret = t4_next_cqe(cq, &hw_cqe);
 473         if (ret)
 474                 return ret;
 475
 476         PDBG("%s CQE OVF %u qpid 0x%0x genbit %u type %u status 0x%0x"
 477              " opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
 478              __func__, CQE_OVFBIT(hw_cqe), CQE_QPID(hw_cqe),
 479              CQE_GENBIT(hw_cqe), CQE_TYPE(hw_cqe), CQE_STATUS(hw_cqe),
 480              CQE_OPCODE(hw_cqe), CQE_LEN(hw_cqe), CQE_WRID_HI(hw_cqe),
 481              CQE_WRID_LOW(hw_cqe));
 482
 483         /*
 484          * skip cqe's not affiliated with a QP.
 485          */
 486         if (wq == NULL) {
 487                 ret = -EAGAIN;
 488                 goto skip_cqe;
 489         }
 490
 491         /*
 492         * skip hw cqe's if the wq is flushed.
 493         */
 494         if (wq->flushed && !SW_CQE(hw_cqe)) {
 495                 ret = -EAGAIN;
 496                 goto skip_cqe;
 497         }
 498
 499         /*
 500          * skip TERMINATE cqes...
 501          */
 502         if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE) {
 503                 ret = -EAGAIN;
 504                 goto skip_cqe;
 505         }
 506
 507         /*
 508          * Special cqe for drain WR completions...
 509          */
 510         if (CQE_OPCODE(hw_cqe) == C4IW_DRAIN_OPCODE) {
 511                 *cookie = CQE_DRAIN_COOKIE(hw_cqe);
 512                 *cqe = *hw_cqe;
 513                 goto skip_cqe;
 514         }
 515
 516         /*
 517          * Gotta tweak READ completions:
 518          *      1) the cqe doesn't contain the sq_wptr from the wr.
 519          *      2) opcode not reflected from the wr.
 520          *      3) read_len not reflected from the wr.
 521          *      4) cq_type is RQ_TYPE not SQ_TYPE.
 522          */
 523         if (RQ_TYPE(hw_cqe) && (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP)) {
 524
 525                 /* If we have reached here because of async
 526                  * event or other error, and have egress error
 527                  * then drop
 528                  */
 529                 if (CQE_TYPE(hw_cqe) == 1) {
 530                         if (CQE_STATUS(hw_cqe))
 531                                 t4_set_wq_in_error(wq);
 532                         ret = -EAGAIN;
 533                         goto skip_cqe;
 534                 }
 535
 536                 /* If this is an unsolicited read response, then the read
 537                  * was generated by the kernel driver as part of peer-2-peer
 538                  * connection setup.  So ignore the completion.
 539                  */
 540                 if (CQE_WRID_STAG(hw_cqe) == 1) {
 541                         if (CQE_STATUS(hw_cqe))
 542                                 t4_set_wq_in_error(wq);
 543                         ret = -EAGAIN;
 544                         goto skip_cqe;
 545                 }
 546
 547                 /*
 548                  * Eat completions for unsignaled read WRs.
 549                  */
 550                 if (!wq->sq.oldest_read->signaled) {
 551                         advance_oldest_read(wq);
 552                         ret = -EAGAIN;
 553                         goto skip_cqe;
 554                 }
 555
 556                 /*
 557                  * Don't write to the HWCQ, so create a new read req CQE
 558                  * in local memory.
 559                  */
 560                 create_read_req_cqe(wq, hw_cqe, &read_cqe);
 561                 hw_cqe = &read_cqe;
 562                 advance_oldest_read(wq);
 563         }
 564
 565         if (CQE_STATUS(hw_cqe) || t4_wq_in_error(wq)) {
 566                 *cqe_flushed = (CQE_STATUS(hw_cqe) == T4_ERR_SWFLUSH);
 567                 t4_set_wq_in_error(wq);
 568         }
 569
 570         /*
 571          * RECV completion.
 572          */
 573         if (RQ_TYPE(hw_cqe)) {
 574
 575                 /*
 576                  * HW only validates 4 bits of MSN.  So we must validate that
 577                  * the MSN in the SEND is the next expected MSN.  If its not,
 578                  * then we complete this with T4_ERR_MSN and mark the wq in
 579                  * error.
 580                  */
 581
 582                 if (t4_rq_empty(wq)) {
 583                         t4_set_wq_in_error(wq);
 584                         ret = -EAGAIN;
 585                         goto skip_cqe;
 586                 }
 587                 if (unlikely((CQE_WRID_MSN(hw_cqe) != (wq->rq.msn)))) {
 588                         t4_set_wq_in_error(wq);
 589                         hw_cqe->header |= htonl(CQE_STATUS_V(T4_ERR_MSN));
 590                         goto proc_cqe;
 591                 }
 592                 goto proc_cqe;
 593         }
 594
 595         /*
 596          * If we get here its a send completion.
 597          *
 598          * Handle out of order completion. These get stuffed
 599          * in the SW SQ. Then the SW SQ is walked to move any
 600          * now in-order completions into the SW CQ.  This handles
 601          * 2 cases:
 602          *      1) reaping unsignaled WRs when the first subsequent
 603          *         signaled WR is completed.
 604          *      2) out of order read completions.
 605          */
 606         if (!SW_CQE(hw_cqe) && (CQE_WRID_SQ_IDX(hw_cqe) != wq->sq.cidx)) {
 607                 struct t4_swsqe *swsqe;
 608
 609                 PDBG("%s out of order completion going in sw_sq at idx %u\n",
 610                      __func__, CQE_WRID_SQ_IDX(hw_cqe));
 611                 swsqe = &wq->sq.sw_sq[CQE_WRID_SQ_IDX(hw_cqe)];
 612                 swsqe->cqe = *hw_cqe;
 613                 swsqe->complete = 1;
 614                 ret = -EAGAIN;
 615                 goto flush_wq;
 616         }
 617
 618 proc_cqe:
 619         *cqe = *hw_cqe;
 620
 621         /*
 622          * Reap the associated WR(s) that are freed up with this
 623          * completion.
 624          */
 625         if (SQ_TYPE(hw_cqe)) {
 626                 int idx = CQE_WRID_SQ_IDX(hw_cqe);
 627                 BUG_ON(idx >= wq->sq.size);
 628
 629                 /*
 630                 * Account for any unsignaled completions completed by
 631                 * this signaled completion.  In this case, cidx points
 632                 * to the first unsignaled one, and idx points to the
 633                 * signaled one.  So adjust in_use based on this delta.
 634                 * if this is not completing any unsigned wrs, then the
 635                 * delta will be 0. Handle wrapping also!
 636                 */
 637                 if (idx < wq->sq.cidx)
 638                         wq->sq.in_use -= wq->sq.size + idx - wq->sq.cidx;
 639                 else
 640                         wq->sq.in_use -= idx - wq->sq.cidx;
 641                 BUG_ON(wq->sq.in_use <= 0 && wq->sq.in_use >= wq->sq.size);
 642
 643                 wq->sq.cidx = (uint16_t)idx;
 644                 PDBG("%s completing sq idx %u\n", __func__, wq->sq.cidx);
 645                 *cookie = wq->sq.sw_sq[wq->sq.cidx].wr_id;
 646                 if (c4iw_wr_log)
 647                         c4iw_log_wr_stats(wq, hw_cqe);
 648                 t4_sq_consume(wq);
 649         } else {
 650                 PDBG("%s completing rq idx %u\n", __func__, wq->rq.cidx);
 651                 *cookie = wq->rq.sw_rq[wq->rq.cidx].wr_id;
 652                 BUG_ON(t4_rq_empty(wq));
 653                 if (c4iw_wr_log)
 654                         c4iw_log_wr_stats(wq, hw_cqe);
 655                 t4_rq_consume(wq);
 656                 goto skip_cqe;
 657         }
 658
 659 flush_wq:
 660         /*
 661          * Flush any completed cqes that are now in-order.
 662          */
 663         flush_completed_wrs(wq, cq);
 664
 665 skip_cqe:
 666         if (SW_CQE(hw_cqe)) {
 667                 PDBG("%s cq %p cqid 0x%x skip sw cqe cidx %u\n",
 668                      __func__, cq, cq->cqid, cq->sw_cidx);
 669                 t4_swcq_consume(cq);
 670         } else {
 671                 PDBG("%s cq %p cqid 0x%x skip hw cqe cidx %u\n",
 672                      __func__, cq, cq->cqid, cq->cidx);
 673                 t4_hwcq_consume(cq);
 674         }
 675         return ret;
 676 }
 677
 678 /*
 679  * Get one cq entry from c4iw and map it to openib.
 680  *
 681  * Returns:
 682  *      0                       cqe returned
 683  *      -ENODATA                EMPTY;
 684  *      -EAGAIN                 caller must try again
 685  *      any other -errno        fatal error
 686  */
 687 static int c4iw_poll_cq_one(struct c4iw_cq *chp, struct ib_wc *wc)
 688 {
 689         struct c4iw_qp *qhp = NULL;
 690         struct t4_cqe uninitialized_var(cqe), *rd_cqe;
 691         struct t4_wq *wq;
 692         u32 credit = 0;
 693         u8 cqe_flushed;
 694         u64 cookie = 0;
 695         int ret;
 696
 697         ret = t4_next_cqe(&chp->cq, &rd_cqe);
 698
 699         if (ret)
 700                 return ret;
 701
 702         qhp = get_qhp(chp->rhp, CQE_QPID(rd_cqe));
 703         if (!qhp)
 704                 wq = NULL;
 705         else {
 706                 spin_lock(&qhp->lock);
 707                 wq = &(qhp->wq);
 708         }
 709         ret = poll_cq(wq, &(chp->cq), &cqe, &cqe_flushed, &cookie, &credit);
 710         if (ret)
 711                 goto out;
 712
 713         wc->wr_id = cookie;
 714         wc->qp = &qhp->ibqp;
 715         wc->vendor_err = CQE_STATUS(&cqe);
 716         wc->wc_flags = 0;
 717
 718         PDBG("%s qpid 0x%x type %d opcode %d status 0x%x len %u wrid hi 0x%x "
 719              "lo 0x%x cookie 0x%llx\n", __func__, CQE_QPID(&cqe),
 720              CQE_TYPE(&cqe), CQE_OPCODE(&cqe), CQE_STATUS(&cqe), CQE_LEN(&cqe),
 721              CQE_WRID_HI(&cqe), CQE_WRID_LOW(&cqe), (unsigned long long)cookie);
 722
 723         if (CQE_TYPE(&cqe) == 0) {
 724                 if (!CQE_STATUS(&cqe))
 725                         wc->byte_len = CQE_LEN(&cqe);
 726                 else
 727                         wc->byte_len = 0;
 728                 wc->opcode = IB_WC_RECV;
 729                 if (CQE_OPCODE(&cqe) == FW_RI_SEND_WITH_INV ||
 730                     CQE_OPCODE(&cqe) == FW_RI_SEND_WITH_SE_INV) {
 731                         wc->ex.invalidate_rkey = CQE_WRID_STAG(&cqe);
 732                         wc->wc_flags |= IB_WC_WITH_INVALIDATE;
 733                         c4iw_invalidate_mr(qhp->rhp, wc->ex.invalidate_rkey);
 734                 }
 735         } else {
 736                 switch (CQE_OPCODE(&cqe)) {
 737                 case FW_RI_RDMA_WRITE:
 738                         wc->opcode = IB_WC_RDMA_WRITE;
 739                         break;
 740                 case FW_RI_READ_REQ:
 741                         wc->opcode = IB_WC_RDMA_READ;
 742                         wc->byte_len = CQE_LEN(&cqe);
 743                         break;
 744                 case FW_RI_SEND_WITH_INV:
 745                 case FW_RI_SEND_WITH_SE_INV:
 746                         wc->opcode = IB_WC_SEND;
 747                         wc->wc_flags |= IB_WC_WITH_INVALIDATE;
 748                         break;
 749                 case FW_RI_SEND:
 750                 case FW_RI_SEND_WITH_SE:
 751                         wc->opcode = IB_WC_SEND;
 752                         break;
 753
 754                 case FW_RI_LOCAL_INV:
 755                         wc->opcode = IB_WC_LOCAL_INV;
 756                         break;
 757                 case FW_RI_FAST_REGISTER:
 758                         wc->opcode = IB_WC_REG_MR;
 759
 760                         /* Invalidate the MR if the fastreg failed */
 761                         if (CQE_STATUS(&cqe) != T4_ERR_SUCCESS)
 762                                 c4iw_invalidate_mr(qhp->rhp,
 763                                                    CQE_WRID_FR_STAG(&cqe));
 764                         break;
 765                 case C4IW_DRAIN_OPCODE:
 766                         wc->opcode = IB_WC_SEND;
 767                         break;
 768                 default:
 769                         printk(KERN_ERR MOD "Unexpected opcode %d "
 770                                "in the CQE received for QPID=0x%0x\n",
 771                                CQE_OPCODE(&cqe), CQE_QPID(&cqe));
 772                         ret = -EINVAL;
 773                         goto out;
 774                 }
 775         }
 776
 777         if (cqe_flushed)
 778                 wc->status = IB_WC_WR_FLUSH_ERR;
 779         else {
 780
 781                 switch (CQE_STATUS(&cqe)) {
 782                 case T4_ERR_SUCCESS:
 783                         wc->status = IB_WC_SUCCESS;
 784                         break;
 785                 case T4_ERR_STAG:
 786                         wc->status = IB_WC_LOC_ACCESS_ERR;
 787                         break;
 788                 case T4_ERR_PDID:
 789                         wc->status = IB_WC_LOC_PROT_ERR;
 790                         break;
 791                 case T4_ERR_QPID:
 792                 case T4_ERR_ACCESS:
 793                         wc->status = IB_WC_LOC_ACCESS_ERR;
 794                         break;
 795                 case T4_ERR_WRAP:
 796                         wc->status = IB_WC_GENERAL_ERR;
 797                         break;
 798                 case T4_ERR_BOUND:
 799                         wc->status = IB_WC_LOC_LEN_ERR;
 800                         break;
 801                 case T4_ERR_INVALIDATE_SHARED_MR:
 802                 case T4_ERR_INVALIDATE_MR_WITH_MW_BOUND:
 803                         wc->status = IB_WC_MW_BIND_ERR;
 804                         break;
 805                 case T4_ERR_CRC:
 806                 case T4_ERR_MARKER:
 807                 case T4_ERR_PDU_LEN_ERR:
 808                 case T4_ERR_OUT_OF_RQE:
 809                 case T4_ERR_DDP_VERSION:
 810                 case T4_ERR_RDMA_VERSION:
 811                 case T4_ERR_DDP_QUEUE_NUM:
 812                 case T4_ERR_MSN:
 813                 case T4_ERR_TBIT:
 814                 case T4_ERR_MO:
 815                 case T4_ERR_MSN_RANGE:
 816                 case T4_ERR_IRD_OVERFLOW:
 817                 case T4_ERR_OPCODE:
 818                 case T4_ERR_INTERNAL_ERR:
 819                         wc->status = IB_WC_FATAL_ERR;
 820                         break;
 821                 case T4_ERR_SWFLUSH:
 822                         wc->status = IB_WC_WR_FLUSH_ERR;
 823                         break;
 824                 default:
 825                         printk(KERN_ERR MOD
 826                                "Unexpected cqe_status 0x%x for QPID=0x%0x\n",
 827                                CQE_STATUS(&cqe), CQE_QPID(&cqe));
 828                         wc->status = IB_WC_FATAL_ERR;
 829                 }
 830         }
 831 out:
 832         if (wq)
 833                 spin_unlock(&qhp->lock);
 834         return ret;
 835 }
 836
 837 int c4iw_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 838 {
 839         struct c4iw_cq *chp;
 840         unsigned long flags;
 841         int npolled;
 842         int err = 0;
 843
 844         chp = to_c4iw_cq(ibcq);
 845
 846         spin_lock_irqsave(&chp->lock, flags);
 847         for (npolled = 0; npolled < num_entries; ++npolled) {
 848                 do {
 849                         err = c4iw_poll_cq_one(chp, wc + npolled);
 850                 } while (err == -EAGAIN);
 851                 if (err)
 852                         break;
 853         }
 854         spin_unlock_irqrestore(&chp->lock, flags);
 855         return !err || err == -ENODATA ? npolled : err;
 856 }
 857
 858 int c4iw_destroy_cq(struct ib_cq *ib_cq)
 859 {
 860         struct c4iw_cq *chp;
 861         struct c4iw_ucontext *ucontext;
 862
 863         PDBG("%s ib_cq %p\n", __func__, ib_cq);
 864         chp = to_c4iw_cq(ib_cq);
 865
 866         remove_handle(chp->rhp, &chp->rhp->cqidr, chp->cq.cqid);
 867         atomic_dec(&chp->refcnt);
 868         wait_event(chp->wait, !atomic_read(&chp->refcnt));
 869
 870         ucontext = ib_cq->uobject ? to_c4iw_ucontext(ib_cq->uobject->context)
 871                                   : NULL;
 872         destroy_cq(&chp->rhp->rdev, &chp->cq,
 873                    ucontext ? &ucontext->uctx : &chp->cq.rdev->uctx,
 874                    chp->destroy_skb);
 875         chp->destroy_skb = NULL;
 876         kfree(chp);
 877         return 0;
 878 }
 879
 880 struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,
 881                              const struct ib_cq_init_attr *attr,
 882                              struct ib_ucontext *ib_context,
 883                              struct ib_udata *udata)
 884 {
 885         int entries = attr->cqe;
 886         int vector = attr->comp_vector;
 887         struct c4iw_dev *rhp;
 888         struct c4iw_cq *chp;
 889         struct c4iw_create_cq_resp uresp;
 890         struct c4iw_ucontext *ucontext = NULL;
 891         int ret, wr_len;
 892         size_t memsize, hwentries;
 893         struct c4iw_mm_entry *mm, *mm2;
 894
 895         PDBG("%s ib_dev %p entries %d\n", __func__, ibdev, entries);
 896         if (attr->flags)
 897                 return ERR_PTR(-EINVAL);
 898
 899         rhp = to_c4iw_dev(ibdev);
 900
 901         if (vector >= rhp->rdev.lldi.nciq)
 902                 return ERR_PTR(-EINVAL);
 903
 904         chp = kzalloc(sizeof(*chp), GFP_KERNEL);
 905         if (!chp)
 906                 return ERR_PTR(-ENOMEM);
 907
 908         wr_len = sizeof(struct fw_ri_res_wr) + sizeof(struct fw_ri_res);
 909         chp->destroy_skb = alloc_skb(wr_len, GFP_KERNEL);
 910         if (!chp->destroy_skb) {
 911                 ret = -ENOMEM;
 912                 goto err1;
 913         }
 914
 915         if (ib_context)
 916                 ucontext = to_c4iw_ucontext(ib_context);
 917
 918         /* account for the status page. */
 919         entries++;
 920
 921         /* IQ needs one extra entry to differentiate full vs empty. */
 922         entries++;
 923
 924         /*
 925          * entries must be multiple of 16 for HW.
 926          */
 927         entries = roundup(entries, 16);
 928
 929         /*
 930          * Make actual HW queue 2x to avoid cdix_inc overflows.
 931          */
 932         hwentries = min(entries * 2, rhp->rdev.hw_queue.t4_max_iq_size);
 933
 934         /*
 935          * Make HW queue at least 64 entries so GTS updates aren't too
 936          * frequent.
 937          */
 938         if (hwentries < 64)
 939                 hwentries = 64;
 940
 941         memsize = hwentries * sizeof *chp->cq.queue;
 942
 943         /*
 944          * memsize must be a multiple of the page size if its a user cq.
 945          */
 946         if (ucontext)
 947                 memsize = roundup(memsize, PAGE_SIZE);
 948         chp->cq.size = hwentries;
 949         chp->cq.memsize = memsize;
 950         chp->cq.vector = vector;
 951
 952         ret = create_cq(&rhp->rdev, &chp->cq,
 953                         ucontext ? &ucontext->uctx : &rhp->rdev.uctx);
 954         if (ret)
 955                 goto err2;
 956
 957         chp->rhp = rhp;
 958         chp->cq.size--;                         /* status page */
 959         chp->ibcq.cqe = entries - 2;
 960         spin_lock_init(&chp->lock);
 961         spin_lock_init(&chp->comp_handler_lock);
 962         atomic_set(&chp->refcnt, 1);
 963         init_waitqueue_head(&chp->wait);
 964         ret = insert_handle(rhp, &rhp->cqidr, chp, chp->cq.cqid);
 965         if (ret)
 966                 goto err3;
 967
 968         if (ucontext) {
 969                 mm = kmalloc(sizeof *mm, GFP_KERNEL);
 970                 if (!mm)
 971                         goto err4;
 972                 mm2 = kmalloc(sizeof *mm2, GFP_KERNEL);
 973                 if (!mm2)
 974                         goto err5;
 975
 976                 uresp.qid_mask = rhp->rdev.cqmask;
 977                 uresp.cqid = chp->cq.cqid;
 978                 uresp.size = chp->cq.size;
 979                 uresp.memsize = chp->cq.memsize;
 980                 spin_lock(&ucontext->mmap_lock);
 981                 uresp.key = ucontext->key;
 982                 ucontext->key += PAGE_SIZE;
 983                 uresp.gts_key = ucontext->key;
 984                 ucontext->key += PAGE_SIZE;
 985                 spin_unlock(&ucontext->mmap_lock);
 986                 ret = ib_copy_to_udata(udata, &uresp,
 987                                        sizeof(uresp) - sizeof(uresp.reserved));
 988                 if (ret)
 989                         goto err6;
 990
 991                 mm->key = uresp.key;
 992                 mm->addr = virt_to_phys(chp->cq.queue);
 993                 mm->len = chp->cq.memsize;
 994                 insert_mmap(ucontext, mm);
 995
 996                 mm2->key = uresp.gts_key;
 997                 mm2->addr = chp->cq.bar2_pa;
 998                 mm2->len = PAGE_SIZE;
 999                 insert_mmap(ucontext, mm2);
1000         }
1001         PDBG("%s cqid 0x%0x chp %p size %u memsize %zu, dma_addr 0x%0llx\n",
1002              __func__, chp->cq.cqid, chp, chp->cq.size,
1003              chp->cq.memsize, (unsigned long long) chp->cq.dma_addr);
1004         return &chp->ibcq;
1005 err6:
1006         kfree(mm2);
1007 err5:
1008         kfree(mm);
1009 err4:
1010         remove_handle(rhp, &rhp->cqidr, chp->cq.cqid);
1011 err3:
1012         destroy_cq(&chp->rhp->rdev, &chp->cq,
1013                    ucontext ? &ucontext->uctx : &rhp->rdev.uctx,
1014                    chp->destroy_skb);
1015 err2:
1016         kfree_skb(chp->destroy_skb);
1017 err1:
1018         kfree(chp);
1019         return ERR_PTR(ret);
1020 }
1021
1022 int c4iw_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
1023 {
1024         return -ENOSYS;
1025 }
1026
1027 int c4iw_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
1028 {
1029         struct c4iw_cq *chp;
1030         int ret = 0;
1031         unsigned long flag;
1032
1033         chp = to_c4iw_cq(ibcq);
1034         spin_lock_irqsave(&chp->lock, flag);
1035         t4_arm_cq(&chp->cq,
1036                   (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED);
1037         if (flags & IB_CQ_REPORT_MISSED_EVENTS)
1038                 ret = t4_cq_notempty(&chp->cq);
1039         spin_unlock_irqrestore(&chp->lock, flag);
1040         return ret;
1041 }