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   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2005, 2006 Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   6  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  *
  36  * $Id: mthca_cq.c 1369 2004-12-20 16:17:07Z roland $
  37  */
  38
  39 #include <linux/init.h>
  40 #include <linux/hardirq.h>
  41
  42 #include <rdma/ib_pack.h>
  43
  44 #include "mthca_dev.h"
  45 #include "mthca_cmd.h"
  46 #include "mthca_memfree.h"
  47
  48 enum {
  49         MTHCA_MAX_DIRECT_CQ_SIZE = 4 * PAGE_SIZE
  50 };
  51
  52 enum {
  53         MTHCA_CQ_ENTRY_SIZE = 0x20
  54 };
  55
  56 /*
  57  * Must be packed because start is 64 bits but only aligned to 32 bits.
  58  */
  59 struct mthca_cq_context {
  60         __be32 flags;
  61         __be64 start;
  62         __be32 logsize_usrpage;
  63         __be32 error_eqn;       /* Tavor only */
  64         __be32 comp_eqn;
  65         __be32 pd;
  66         __be32 lkey;
  67         __be32 last_notified_index;
  68         __be32 solicit_producer_index;
  69         __be32 consumer_index;
  70         __be32 producer_index;
  71         __be32 cqn;
  72         __be32 ci_db;           /* Arbel only */
  73         __be32 state_db;        /* Arbel only */
  74         u32    reserved;
  75 } __attribute__((packed));
  76
  77 #define MTHCA_CQ_STATUS_OK          ( 0 << 28)
  78 #define MTHCA_CQ_STATUS_OVERFLOW    ( 9 << 28)
  79 #define MTHCA_CQ_STATUS_WRITE_FAIL  (10 << 28)
  80 #define MTHCA_CQ_FLAG_TR            ( 1 << 18)
  81 #define MTHCA_CQ_FLAG_OI            ( 1 << 17)
  82 #define MTHCA_CQ_STATE_DISARMED     ( 0 <<  8)
  83 #define MTHCA_CQ_STATE_ARMED        ( 1 <<  8)
  84 #define MTHCA_CQ_STATE_ARMED_SOL    ( 4 <<  8)
  85 #define MTHCA_EQ_STATE_FIRED        (10 <<  8)
  86
  87 enum {
  88         MTHCA_ERROR_CQE_OPCODE_MASK = 0xfe
  89 };
  90
  91 enum {
  92         SYNDROME_LOCAL_LENGTH_ERR        = 0x01,
  93         SYNDROME_LOCAL_QP_OP_ERR         = 0x02,
  94         SYNDROME_LOCAL_EEC_OP_ERR        = 0x03,
  95         SYNDROME_LOCAL_PROT_ERR          = 0x04,
  96         SYNDROME_WR_FLUSH_ERR            = 0x05,
  97         SYNDROME_MW_BIND_ERR             = 0x06,
  98         SYNDROME_BAD_RESP_ERR            = 0x10,
  99         SYNDROME_LOCAL_ACCESS_ERR        = 0x11,
 100         SYNDROME_REMOTE_INVAL_REQ_ERR    = 0x12,
 101         SYNDROME_REMOTE_ACCESS_ERR       = 0x13,
 102         SYNDROME_REMOTE_OP_ERR           = 0x14,
 103         SYNDROME_RETRY_EXC_ERR           = 0x15,
 104         SYNDROME_RNR_RETRY_EXC_ERR       = 0x16,
 105         SYNDROME_LOCAL_RDD_VIOL_ERR      = 0x20,
 106         SYNDROME_REMOTE_INVAL_RD_REQ_ERR = 0x21,
 107         SYNDROME_REMOTE_ABORTED_ERR      = 0x22,
 108         SYNDROME_INVAL_EECN_ERR          = 0x23,
 109         SYNDROME_INVAL_EEC_STATE_ERR     = 0x24
 110 };
 111
 112 struct mthca_cqe {
 113         __be32 my_qpn;
 114         __be32 my_ee;
 115         __be32 rqpn;
 116         __be16 sl_g_mlpath;
 117         __be16 rlid;
 118         __be32 imm_etype_pkey_eec;
 119         __be32 byte_cnt;
 120         __be32 wqe;
 121         u8     opcode;
 122         u8     is_send;
 123         u8     reserved;
 124         u8     owner;
 125 };
 126
 127 struct mthca_err_cqe {
 128         __be32 my_qpn;
 129         u32    reserved1[3];
 130         u8     syndrome;
 131         u8     vendor_err;
 132         __be16 db_cnt;
 133         u32    reserved2;
 134         __be32 wqe;
 135         u8     opcode;
 136         u8     reserved3[2];
 137         u8     owner;
 138 };
 139
 140 #define MTHCA_CQ_ENTRY_OWNER_SW      (0 << 7)
 141 #define MTHCA_CQ_ENTRY_OWNER_HW      (1 << 7)
 142
 143 #define MTHCA_TAVOR_CQ_DB_INC_CI       (1 << 24)
 144 #define MTHCA_TAVOR_CQ_DB_REQ_NOT      (2 << 24)
 145 #define MTHCA_TAVOR_CQ_DB_REQ_NOT_SOL  (3 << 24)
 146 #define MTHCA_TAVOR_CQ_DB_SET_CI       (4 << 24)
 147 #define MTHCA_TAVOR_CQ_DB_REQ_NOT_MULT (5 << 24)
 148
 149 #define MTHCA_ARBEL_CQ_DB_REQ_NOT_SOL  (1 << 24)
 150 #define MTHCA_ARBEL_CQ_DB_REQ_NOT      (2 << 24)
 151 #define MTHCA_ARBEL_CQ_DB_REQ_NOT_MULT (3 << 24)
 152
 153 static inline struct mthca_cqe *get_cqe_from_buf(struct mthca_cq_buf *buf,
 154                                                  int entry)
 155 {
 156         if (buf->is_direct)
 157                 return buf->queue.direct.buf + (entry * MTHCA_CQ_ENTRY_SIZE);
 158         else
 159                 return buf->queue.page_list[entry * MTHCA_CQ_ENTRY_SIZE / PAGE_SIZE].buf
 160                         + (entry * MTHCA_CQ_ENTRY_SIZE) % PAGE_SIZE;
 161 }
 162
 163 static inline struct mthca_cqe *get_cqe(struct mthca_cq *cq, int entry)
 164 {
 165         return get_cqe_from_buf(&cq->buf, entry);
 166 }
 167
 168 static inline struct mthca_cqe *cqe_sw(struct mthca_cqe *cqe)
 169 {
 170         return MTHCA_CQ_ENTRY_OWNER_HW & cqe->owner ? NULL : cqe;
 171 }
 172
 173 static inline struct mthca_cqe *next_cqe_sw(struct mthca_cq *cq)
 174 {
 175         return cqe_sw(get_cqe(cq, cq->cons_index & cq->ibcq.cqe));
 176 }
 177
 178 static inline void set_cqe_hw(struct mthca_cqe *cqe)
 179 {
 180         cqe->owner = MTHCA_CQ_ENTRY_OWNER_HW;
 181 }
 182
 183 static void dump_cqe(struct mthca_dev *dev, void *cqe_ptr)
 184 {
 185         __be32 *cqe = cqe_ptr;
 186
 187         (void) cqe;     /* avoid warning if mthca_dbg compiled away... */
 188         mthca_dbg(dev, "CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
 189                   be32_to_cpu(cqe[0]), be32_to_cpu(cqe[1]), be32_to_cpu(cqe[2]),
 190                   be32_to_cpu(cqe[3]), be32_to_cpu(cqe[4]), be32_to_cpu(cqe[5]),
 191                   be32_to_cpu(cqe[6]), be32_to_cpu(cqe[7]));
 192 }
 193
 194 /*
 195  * incr is ignored in native Arbel (mem-free) mode, so cq->cons_index
 196  * should be correct before calling update_cons_index().
 197  */
 198 static inline void update_cons_index(struct mthca_dev *dev, struct mthca_cq *cq,
 199                                      int incr)
 200 {
 201         __be32 doorbell[2];
 202
 203         if (mthca_is_memfree(dev)) {
 204                 *cq->set_ci_db = cpu_to_be32(cq->cons_index);
 205                 wmb();
 206         } else {
 207                 doorbell[0] = cpu_to_be32(MTHCA_TAVOR_CQ_DB_INC_CI | cq->cqn);
 208                 doorbell[1] = cpu_to_be32(incr - 1);
 209
 210                 mthca_write64(doorbell,
 211                               dev->kar + MTHCA_CQ_DOORBELL,
 212                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
 213         }
 214 }
 215
 216 void mthca_cq_completion(struct mthca_dev *dev, u32 cqn)
 217 {
 218         struct mthca_cq *cq;
 219
 220         cq = mthca_array_get(&dev->cq_table.cq, cqn & (dev->limits.num_cqs - 1));
 221
 222         if (!cq) {
 223                 mthca_warn(dev, "Completion event for bogus CQ %08x\n", cqn);
 224                 return;
 225         }
 226
 227         ++cq->arm_sn;
 228
 229         cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
 230 }
 231
 232 void mthca_cq_event(struct mthca_dev *dev, u32 cqn,
 233                     enum ib_event_type event_type)
 234 {
 235         struct mthca_cq *cq;
 236         struct ib_event event;
 237
 238         spin_lock(&dev->cq_table.lock);
 239
 240         cq = mthca_array_get(&dev->cq_table.cq, cqn & (dev->limits.num_cqs - 1));
 241
 242         if (cq)
 243                 atomic_inc(&cq->refcount);
 244         spin_unlock(&dev->cq_table.lock);
 245
 246         if (!cq) {
 247                 mthca_warn(dev, "Async event for bogus CQ %08x\n", cqn);
 248                 return;
 249         }
 250
 251         event.device      = &dev->ib_dev;
 252         event.event       = event_type;
 253         event.element.cq  = &cq->ibcq;
 254         if (cq->ibcq.event_handler)
 255                 cq->ibcq.event_handler(&event, cq->ibcq.cq_context);
 256
 257         if (atomic_dec_and_test(&cq->refcount))
 258                 wake_up(&cq->wait);
 259 }
 260
 261 static inline int is_recv_cqe(struct mthca_cqe *cqe)
 262 {
 263         if ((cqe->opcode & MTHCA_ERROR_CQE_OPCODE_MASK) ==
 264             MTHCA_ERROR_CQE_OPCODE_MASK)
 265                 return !(cqe->opcode & 0x01);
 266         else
 267                 return !(cqe->is_send & 0x80);
 268 }
 269
 270 void mthca_cq_clean(struct mthca_dev *dev, u32 cqn, u32 qpn,
 271                     struct mthca_srq *srq)
 272 {
 273         struct mthca_cq *cq;
 274         struct mthca_cqe *cqe;
 275         u32 prod_index;
 276         int nfreed = 0;
 277
 278         spin_lock_irq(&dev->cq_table.lock);
 279         cq = mthca_array_get(&dev->cq_table.cq, cqn & (dev->limits.num_cqs - 1));
 280         if (cq)
 281                 atomic_inc(&cq->refcount);
 282         spin_unlock_irq(&dev->cq_table.lock);
 283
 284         if (!cq)
 285                 return;
 286
 287         spin_lock_irq(&cq->lock);
 288
 289         /*
 290          * First we need to find the current producer index, so we
 291          * know where to start cleaning from.  It doesn't matter if HW
 292          * adds new entries after this loop -- the QP we're worried
 293          * about is already in RESET, so the new entries won't come
 294          * from our QP and therefore don't need to be checked.
 295          */
 296         for (prod_index = cq->cons_index;
 297              cqe_sw(get_cqe(cq, prod_index & cq->ibcq.cqe));
 298              ++prod_index)
 299                 if (prod_index == cq->cons_index + cq->ibcq.cqe)
 300                         break;
 301
 302         if (0)
 303                 mthca_dbg(dev, "Cleaning QPN %06x from CQN %06x; ci %d, pi %d\n",
 304                           qpn, cqn, cq->cons_index, prod_index);
 305
 306         /*
 307          * Now sweep backwards through the CQ, removing CQ entries
 308          * that match our QP by copying older entries on top of them.
 309          */
 310         while ((int) --prod_index - (int) cq->cons_index >= 0) {
 311                 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
 312                 if (cqe->my_qpn == cpu_to_be32(qpn)) {
 313                         if (srq && is_recv_cqe(cqe))
 314                                 mthca_free_srq_wqe(srq, be32_to_cpu(cqe->wqe));
 315                         ++nfreed;
 316                 } else if (nfreed)
 317                         memcpy(get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe),
 318                                cqe, MTHCA_CQ_ENTRY_SIZE);
 319         }
 320
 321         if (nfreed) {
 322                 wmb();
 323                 cq->cons_index += nfreed;
 324                 update_cons_index(dev, cq, nfreed);
 325         }
 326
 327         spin_unlock_irq(&cq->lock);
 328         if (atomic_dec_and_test(&cq->refcount))
 329                 wake_up(&cq->wait);
 330 }
 331
 332 void mthca_cq_resize_copy_cqes(struct mthca_cq *cq)
 333 {
 334         int i;
 335
 336         /*
 337          * In Tavor mode, the hardware keeps the consumer and producer
 338          * indices mod the CQ size.  Since we might be making the CQ
 339          * bigger, we need to deal with the case where the producer
 340          * index wrapped around before the CQ was resized.
 341          */
 342         if (!mthca_is_memfree(to_mdev(cq->ibcq.device)) &&
 343             cq->ibcq.cqe < cq->resize_buf->cqe) {
 344                 cq->cons_index &= cq->ibcq.cqe;
 345                 if (cqe_sw(get_cqe(cq, cq->ibcq.cqe)))
 346                         cq->cons_index -= cq->ibcq.cqe + 1;
 347         }
 348
 349         for (i = cq->cons_index; cqe_sw(get_cqe(cq, i & cq->ibcq.cqe)); ++i)
 350                 memcpy(get_cqe_from_buf(&cq->resize_buf->buf,
 351                                         i & cq->resize_buf->cqe),
 352                        get_cqe(cq, i & cq->ibcq.cqe), MTHCA_CQ_ENTRY_SIZE);
 353 }
 354
 355 int mthca_alloc_cq_buf(struct mthca_dev *dev, struct mthca_cq_buf *buf, int nent)
 356 {
 357         int ret;
 358         int i;
 359
 360         ret = mthca_buf_alloc(dev, nent * MTHCA_CQ_ENTRY_SIZE,
 361                               MTHCA_MAX_DIRECT_CQ_SIZE,
 362                               &buf->queue, &buf->is_direct,
 363                               &dev->driver_pd, 1, &buf->mr);
 364         if (ret)
 365                 return ret;
 366
 367         for (i = 0; i < nent; ++i)
 368                 set_cqe_hw(get_cqe_from_buf(buf, i));
 369
 370         return 0;
 371 }
 372
 373 void mthca_free_cq_buf(struct mthca_dev *dev, struct mthca_cq_buf *buf, int cqe)
 374 {
 375         mthca_buf_free(dev, (cqe + 1) * MTHCA_CQ_ENTRY_SIZE, &buf->queue,
 376                        buf->is_direct, &buf->mr);
 377 }
 378
 379 static void handle_error_cqe(struct mthca_dev *dev, struct mthca_cq *cq,
 380                              struct mthca_qp *qp, int wqe_index, int is_send,
 381                              struct mthca_err_cqe *cqe,
 382                              struct ib_wc *entry, int *free_cqe)
 383 {
 384         int dbd;
 385         __be32 new_wqe;
 386
 387         if (cqe->syndrome == SYNDROME_LOCAL_QP_OP_ERR) {
 388                 mthca_dbg(dev, "local QP operation err "
 389                           "(QPN %06x, WQE @ %08x, CQN %06x, index %d)\n",
 390                           be32_to_cpu(cqe->my_qpn), be32_to_cpu(cqe->wqe),
 391                           cq->cqn, cq->cons_index);
 392                 dump_cqe(dev, cqe);
 393         }
 394
 395         /*
 396          * For completions in error, only work request ID, status, vendor error
 397          * (and freed resource count for RD) have to be set.
 398          */
 399         switch (cqe->syndrome) {
 400         case SYNDROME_LOCAL_LENGTH_ERR:
 401                 entry->status = IB_WC_LOC_LEN_ERR;
 402                 break;
 403         case SYNDROME_LOCAL_QP_OP_ERR:
 404                 entry->status = IB_WC_LOC_QP_OP_ERR;
 405                 break;
 406         case SYNDROME_LOCAL_EEC_OP_ERR:
 407                 entry->status = IB_WC_LOC_EEC_OP_ERR;
 408                 break;
 409         case SYNDROME_LOCAL_PROT_ERR:
 410                 entry->status = IB_WC_LOC_PROT_ERR;
 411                 break;
 412         case SYNDROME_WR_FLUSH_ERR:
 413                 entry->status = IB_WC_WR_FLUSH_ERR;
 414                 break;
 415         case SYNDROME_MW_BIND_ERR:
 416                 entry->status = IB_WC_MW_BIND_ERR;
 417                 break;
 418         case SYNDROME_BAD_RESP_ERR:
 419                 entry->status = IB_WC_BAD_RESP_ERR;
 420                 break;
 421         case SYNDROME_LOCAL_ACCESS_ERR:
 422                 entry->status = IB_WC_LOC_ACCESS_ERR;
 423                 break;
 424         case SYNDROME_REMOTE_INVAL_REQ_ERR:
 425                 entry->status = IB_WC_REM_INV_REQ_ERR;
 426                 break;
 427         case SYNDROME_REMOTE_ACCESS_ERR:
 428                 entry->status = IB_WC_REM_ACCESS_ERR;
 429                 break;
 430         case SYNDROME_REMOTE_OP_ERR:
 431                 entry->status = IB_WC_REM_OP_ERR;
 432                 break;
 433         case SYNDROME_RETRY_EXC_ERR:
 434                 entry->status = IB_WC_RETRY_EXC_ERR;
 435                 break;
 436         case SYNDROME_RNR_RETRY_EXC_ERR:
 437                 entry->status = IB_WC_RNR_RETRY_EXC_ERR;
 438                 break;
 439         case SYNDROME_LOCAL_RDD_VIOL_ERR:
 440                 entry->status = IB_WC_LOC_RDD_VIOL_ERR;
 441                 break;
 442         case SYNDROME_REMOTE_INVAL_RD_REQ_ERR:
 443                 entry->status = IB_WC_REM_INV_RD_REQ_ERR;
 444                 break;
 445         case SYNDROME_REMOTE_ABORTED_ERR:
 446                 entry->status = IB_WC_REM_ABORT_ERR;
 447                 break;
 448         case SYNDROME_INVAL_EECN_ERR:
 449                 entry->status = IB_WC_INV_EECN_ERR;
 450                 break;
 451         case SYNDROME_INVAL_EEC_STATE_ERR:
 452                 entry->status = IB_WC_INV_EEC_STATE_ERR;
 453                 break;
 454         default:
 455                 entry->status = IB_WC_GENERAL_ERR;
 456                 break;
 457         }
 458
 459         entry->vendor_err = cqe->vendor_err;
 460
 461         /*
 462          * Mem-free HCAs always generate one CQE per WQE, even in the
 463          * error case, so we don't have to check the doorbell count, etc.
 464          */
 465         if (mthca_is_memfree(dev))
 466                 return;
 467
 468         mthca_free_err_wqe(dev, qp, is_send, wqe_index, &dbd, &new_wqe);
 469
 470         /*
 471          * If we're at the end of the WQE chain, or we've used up our
 472          * doorbell count, free the CQE.  Otherwise just update it for
 473          * the next poll operation.
 474          */
 475         if (!(new_wqe & cpu_to_be32(0x3f)) || (!cqe->db_cnt && dbd))
 476                 return;
 477
 478         cqe->db_cnt   = cpu_to_be16(be16_to_cpu(cqe->db_cnt) - dbd);
 479         cqe->wqe      = new_wqe;
 480         cqe->syndrome = SYNDROME_WR_FLUSH_ERR;
 481
 482         *free_cqe = 0;
 483 }
 484
 485 static inline int mthca_poll_one(struct mthca_dev *dev,
 486                                  struct mthca_cq *cq,
 487                                  struct mthca_qp **cur_qp,
 488                                  int *freed,
 489                                  struct ib_wc *entry)
 490 {
 491         struct mthca_wq *wq;
 492         struct mthca_cqe *cqe;
 493         int wqe_index;
 494         int is_error;
 495         int is_send;
 496         int free_cqe = 1;
 497         int err = 0;
 498
 499         cqe = next_cqe_sw(cq);
 500         if (!cqe)
 501                 return -EAGAIN;
 502
 503         /*
 504          * Make sure we read CQ entry contents after we've checked the
 505          * ownership bit.
 506          */
 507         rmb();
 508
 509         if (0) {
 510                 mthca_dbg(dev, "%x/%d: CQE -> QPN %06x, WQE @ %08x\n",
 511                           cq->cqn, cq->cons_index, be32_to_cpu(cqe->my_qpn),
 512                           be32_to_cpu(cqe->wqe));
 513                 dump_cqe(dev, cqe);
 514         }
 515
 516         is_error = (cqe->opcode & MTHCA_ERROR_CQE_OPCODE_MASK) ==
 517                 MTHCA_ERROR_CQE_OPCODE_MASK;
 518         is_send  = is_error ? cqe->opcode & 0x01 : cqe->is_send & 0x80;
 519
 520         if (!*cur_qp || be32_to_cpu(cqe->my_qpn) != (*cur_qp)->qpn) {
 521                 /*
 522                  * We do not have to take the QP table lock here,
 523                  * because CQs will be locked while QPs are removed
 524                  * from the table.
 525                  */
 526                 *cur_qp = mthca_array_get(&dev->qp_table.qp,
 527                                           be32_to_cpu(cqe->my_qpn) &
 528                                           (dev->limits.num_qps - 1));
 529                 if (!*cur_qp) {
 530                         mthca_warn(dev, "CQ entry for unknown QP %06x\n",
 531                                    be32_to_cpu(cqe->my_qpn) & 0xffffff);
 532                         err = -EINVAL;
 533                         goto out;
 534                 }
 535         }
 536
 537         entry->qp_num = (*cur_qp)->qpn;
 538
 539         if (is_send) {
 540                 wq = &(*cur_qp)->sq;
 541                 wqe_index = ((be32_to_cpu(cqe->wqe) - (*cur_qp)->send_wqe_offset)
 542                              >> wq->wqe_shift);
 543                 entry->wr_id = (*cur_qp)->wrid[wqe_index +
 544                                                (*cur_qp)->rq.max];
 545         } else if ((*cur_qp)->ibqp.srq) {
 546                 struct mthca_srq *srq = to_msrq((*cur_qp)->ibqp.srq);
 547                 u32 wqe = be32_to_cpu(cqe->wqe);
 548                 wq = NULL;
 549                 wqe_index = wqe >> srq->wqe_shift;
 550                 entry->wr_id = srq->wrid[wqe_index];
 551                 mthca_free_srq_wqe(srq, wqe);
 552         } else {
 553                 wq = &(*cur_qp)->rq;
 554                 wqe_index = be32_to_cpu(cqe->wqe) >> wq->wqe_shift;
 555                 entry->wr_id = (*cur_qp)->wrid[wqe_index];
 556         }
 557
 558         if (wq) {
 559                 if (wq->last_comp < wqe_index)
 560                         wq->tail += wqe_index - wq->last_comp;
 561                 else
 562                         wq->tail += wqe_index + wq->max - wq->last_comp;
 563
 564                 wq->last_comp = wqe_index;
 565         }
 566
 567         if (is_error) {
 568                 handle_error_cqe(dev, cq, *cur_qp, wqe_index, is_send,
 569                                  (struct mthca_err_cqe *) cqe,
 570                                  entry, &free_cqe);
 571                 goto out;
 572         }
 573
 574         if (is_send) {
 575                 entry->wc_flags = 0;
 576                 switch (cqe->opcode) {
 577                 case MTHCA_OPCODE_RDMA_WRITE:
 578                         entry->opcode    = IB_WC_RDMA_WRITE;
 579                         break;
 580                 case MTHCA_OPCODE_RDMA_WRITE_IMM:
 581                         entry->opcode    = IB_WC_RDMA_WRITE;
 582                         entry->wc_flags |= IB_WC_WITH_IMM;
 583                         break;
 584                 case MTHCA_OPCODE_SEND:
 585                         entry->opcode    = IB_WC_SEND;
 586                         break;
 587                 case MTHCA_OPCODE_SEND_IMM:
 588                         entry->opcode    = IB_WC_SEND;
 589                         entry->wc_flags |= IB_WC_WITH_IMM;
 590                         break;
 591                 case MTHCA_OPCODE_RDMA_READ:
 592                         entry->opcode    = IB_WC_RDMA_READ;
 593                         entry->byte_len  = be32_to_cpu(cqe->byte_cnt);
 594                         break;
 595                 case MTHCA_OPCODE_ATOMIC_CS:
 596                         entry->opcode    = IB_WC_COMP_SWAP;
 597                         entry->byte_len  = be32_to_cpu(cqe->byte_cnt);
 598                         break;
 599                 case MTHCA_OPCODE_ATOMIC_FA:
 600                         entry->opcode    = IB_WC_FETCH_ADD;
 601                         entry->byte_len  = be32_to_cpu(cqe->byte_cnt);
 602                         break;
 603                 case MTHCA_OPCODE_BIND_MW:
 604                         entry->opcode    = IB_WC_BIND_MW;
 605                         break;
 606                 default:
 607                         entry->opcode    = MTHCA_OPCODE_INVALID;
 608                         break;
 609                 }
 610         } else {
 611                 entry->byte_len = be32_to_cpu(cqe->byte_cnt);
 612                 switch (cqe->opcode & 0x1f) {
 613                 case IB_OPCODE_SEND_LAST_WITH_IMMEDIATE:
 614                 case IB_OPCODE_SEND_ONLY_WITH_IMMEDIATE:
 615                         entry->wc_flags = IB_WC_WITH_IMM;
 616                         entry->imm_data = cqe->imm_etype_pkey_eec;
 617                         entry->opcode = IB_WC_RECV;
 618                         break;
 619                 case IB_OPCODE_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 620                 case IB_OPCODE_RDMA_WRITE_ONLY_WITH_IMMEDIATE:
 621                         entry->wc_flags = IB_WC_WITH_IMM;
 622                         entry->imm_data = cqe->imm_etype_pkey_eec;
 623                         entry->opcode = IB_WC_RECV_RDMA_WITH_IMM;
 624                         break;
 625                 default:
 626                         entry->wc_flags = 0;
 627                         entry->opcode = IB_WC_RECV;
 628                         break;
 629                 }
 630                 entry->slid        = be16_to_cpu(cqe->rlid);
 631                 entry->sl          = be16_to_cpu(cqe->sl_g_mlpath) >> 12;
 632                 entry->src_qp      = be32_to_cpu(cqe->rqpn) & 0xffffff;
 633                 entry->dlid_path_bits = be16_to_cpu(cqe->sl_g_mlpath) & 0x7f;
 634                 entry->pkey_index  = be32_to_cpu(cqe->imm_etype_pkey_eec) >> 16;
 635                 entry->wc_flags   |= be16_to_cpu(cqe->sl_g_mlpath) & 0x80 ?
 636                                         IB_WC_GRH : 0;
 637         }
 638
 639         entry->status = IB_WC_SUCCESS;
 640
 641  out:
 642         if (likely(free_cqe)) {
 643                 set_cqe_hw(cqe);
 644                 ++(*freed);
 645                 ++cq->cons_index;
 646         }
 647
 648         return err;
 649 }
 650
 651 int mthca_poll_cq(struct ib_cq *ibcq, int num_entries,
 652                   struct ib_wc *entry)
 653 {
 654         struct mthca_dev *dev = to_mdev(ibcq->device);
 655         struct mthca_cq *cq = to_mcq(ibcq);
 656         struct mthca_qp *qp = NULL;
 657         unsigned long flags;
 658         int err = 0;
 659         int freed = 0;
 660         int npolled;
 661
 662         spin_lock_irqsave(&cq->lock, flags);
 663
 664         npolled = 0;
 665 repoll:
 666         while (npolled < num_entries) {
 667                 err = mthca_poll_one(dev, cq, &qp,
 668                                      &freed, entry + npolled);
 669                 if (err)
 670                         break;
 671                 ++npolled;
 672         }
 673
 674         if (freed) {
 675                 wmb();
 676                 update_cons_index(dev, cq, freed);
 677         }
 678
 679         /*
 680          * If a CQ resize is in progress and we discovered that the
 681          * old buffer is empty, then peek in the new buffer, and if
 682          * it's not empty, switch to the new buffer and continue
 683          * polling there.
 684          */
 685         if (unlikely(err == -EAGAIN && cq->resize_buf &&
 686                      cq->resize_buf->state == CQ_RESIZE_READY)) {
 687                 /*
 688                  * In Tavor mode, the hardware keeps the producer
 689                  * index modulo the CQ size.  Since we might be making
 690                  * the CQ bigger, we need to mask our consumer index
 691                  * using the size of the old CQ buffer before looking
 692                  * in the new CQ buffer.
 693                  */
 694                 if (!mthca_is_memfree(dev))
 695                         cq->cons_index &= cq->ibcq.cqe;
 696
 697                 if (cqe_sw(get_cqe_from_buf(&cq->resize_buf->buf,
 698                                             cq->cons_index & cq->resize_buf->cqe))) {
 699                         struct mthca_cq_buf tbuf;
 700                         int tcqe;
 701
 702                         tbuf         = cq->buf;
 703                         tcqe         = cq->ibcq.cqe;
 704                         cq->buf      = cq->resize_buf->buf;
 705                         cq->ibcq.cqe = cq->resize_buf->cqe;
 706
 707                         cq->resize_buf->buf   = tbuf;
 708                         cq->resize_buf->cqe   = tcqe;
 709                         cq->resize_buf->state = CQ_RESIZE_SWAPPED;
 710
 711                         goto repoll;
 712                 }
 713         }
 714
 715         spin_unlock_irqrestore(&cq->lock, flags);
 716
 717         return err == 0 || err == -EAGAIN ? npolled : err;
 718 }
 719
 720 int mthca_tavor_arm_cq(struct ib_cq *cq, enum ib_cq_notify notify)
 721 {
 722         __be32 doorbell[2];
 723
 724         doorbell[0] = cpu_to_be32((notify == IB_CQ_SOLICITED ?
 725                                    MTHCA_TAVOR_CQ_DB_REQ_NOT_SOL :
 726                                    MTHCA_TAVOR_CQ_DB_REQ_NOT)      |
 727                                   to_mcq(cq)->cqn);
 728         doorbell[1] = (__force __be32) 0xffffffff;
 729
 730         mthca_write64(doorbell,
 731                       to_mdev(cq->device)->kar + MTHCA_CQ_DOORBELL,
 732                       MTHCA_GET_DOORBELL_LOCK(&to_mdev(cq->device)->doorbell_lock));
 733
 734         return 0;
 735 }
 736
 737 int mthca_arbel_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify notify)
 738 {
 739         struct mthca_cq *cq = to_mcq(ibcq);
 740         __be32 doorbell[2];
 741         u32 sn;
 742         __be32 ci;
 743
 744         sn = cq->arm_sn & 3;
 745         ci = cpu_to_be32(cq->cons_index);
 746
 747         doorbell[0] = ci;
 748         doorbell[1] = cpu_to_be32((cq->cqn << 8) | (2 << 5) | (sn << 3) |
 749                                   (notify == IB_CQ_SOLICITED ? 1 : 2));
 750
 751         mthca_write_db_rec(doorbell, cq->arm_db);
 752
 753         /*
 754          * Make sure that the doorbell record in host memory is
 755          * written before ringing the doorbell via PCI MMIO.
 756          */
 757         wmb();
 758
 759         doorbell[0] = cpu_to_be32((sn << 28)                       |
 760                                   (notify == IB_CQ_SOLICITED ?
 761                                    MTHCA_ARBEL_CQ_DB_REQ_NOT_SOL :
 762                                    MTHCA_ARBEL_CQ_DB_REQ_NOT)      |
 763                                   cq->cqn);
 764         doorbell[1] = ci;
 765
 766         mthca_write64(doorbell,
 767                       to_mdev(ibcq->device)->kar + MTHCA_CQ_DOORBELL,
 768                       MTHCA_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->doorbell_lock));
 769
 770         return 0;
 771 }
 772
 773 int mthca_init_cq(struct mthca_dev *dev, int nent,
 774                   struct mthca_ucontext *ctx, u32 pdn,
 775                   struct mthca_cq *cq)
 776 {
 777         struct mthca_mailbox *mailbox;
 778         struct mthca_cq_context *cq_context;
 779         int err = -ENOMEM;
 780         u8 status;
 781
 782         cq->ibcq.cqe  = nent - 1;
 783         cq->is_kernel = !ctx;
 784
 785         cq->cqn = mthca_alloc(&dev->cq_table.alloc);
 786         if (cq->cqn == -1)
 787                 return -ENOMEM;
 788
 789         if (mthca_is_memfree(dev)) {
 790                 err = mthca_table_get(dev, dev->cq_table.table, cq->cqn);
 791                 if (err)
 792                         goto err_out;
 793
 794                 if (cq->is_kernel) {
 795                         cq->arm_sn = 1;
 796
 797                         err = -ENOMEM;
 798
 799                         cq->set_ci_db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_CQ_SET_CI,
 800                                                              cq->cqn, &cq->set_ci_db);
 801                         if (cq->set_ci_db_index < 0)
 802                                 goto err_out_icm;
 803
 804                         cq->arm_db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_CQ_ARM,
 805                                                           cq->cqn, &cq->arm_db);
 806                         if (cq->arm_db_index < 0)
 807                                 goto err_out_ci;
 808                 }
 809         }
 810
 811         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 812         if (IS_ERR(mailbox))
 813                 goto err_out_arm;
 814
 815         cq_context = mailbox->buf;
 816
 817         if (cq->is_kernel) {
 818                 err = mthca_alloc_cq_buf(dev, &cq->buf, nent);
 819                 if (err)
 820                         goto err_out_mailbox;
 821         }
 822
 823         spin_lock_init(&cq->lock);
 824         atomic_set(&cq->refcount, 1);
 825         init_waitqueue_head(&cq->wait);
 826
 827         memset(cq_context, 0, sizeof *cq_context);
 828         cq_context->flags           = cpu_to_be32(MTHCA_CQ_STATUS_OK      |
 829                                                   MTHCA_CQ_STATE_DISARMED |
 830                                                   MTHCA_CQ_FLAG_TR);
 831         cq_context->logsize_usrpage = cpu_to_be32((ffs(nent) - 1) << 24);
 832         if (ctx)
 833                 cq_context->logsize_usrpage |= cpu_to_be32(ctx->uar.index);
 834         else
 835                 cq_context->logsize_usrpage |= cpu_to_be32(dev->driver_uar.index);
 836         cq_context->error_eqn       = cpu_to_be32(dev->eq_table.eq[MTHCA_EQ_ASYNC].eqn);
 837         cq_context->comp_eqn        = cpu_to_be32(dev->eq_table.eq[MTHCA_EQ_COMP].eqn);
 838         cq_context->pd              = cpu_to_be32(pdn);
 839         cq_context->lkey            = cpu_to_be32(cq->buf.mr.ibmr.lkey);
 840         cq_context->cqn             = cpu_to_be32(cq->cqn);
 841
 842         if (mthca_is_memfree(dev)) {
 843                 cq_context->ci_db    = cpu_to_be32(cq->set_ci_db_index);
 844                 cq_context->state_db = cpu_to_be32(cq->arm_db_index);
 845         }
 846
 847         err = mthca_SW2HW_CQ(dev, mailbox, cq->cqn, &status);
 848         if (err) {
 849                 mthca_warn(dev, "SW2HW_CQ failed (%d)\n", err);
 850                 goto err_out_free_mr;
 851         }
 852
 853         if (status) {
 854                 mthca_warn(dev, "SW2HW_CQ returned status 0x%02x\n",
 855                            status);
 856                 err = -EINVAL;
 857                 goto err_out_free_mr;
 858         }
 859
 860         spin_lock_irq(&dev->cq_table.lock);
 861         if (mthca_array_set(&dev->cq_table.cq,
 862                             cq->cqn & (dev->limits.num_cqs - 1),
 863                             cq)) {
 864                 spin_unlock_irq(&dev->cq_table.lock);
 865                 goto err_out_free_mr;
 866         }
 867         spin_unlock_irq(&dev->cq_table.lock);
 868
 869         cq->cons_index = 0;
 870
 871         mthca_free_mailbox(dev, mailbox);
 872
 873         return 0;
 874
 875 err_out_free_mr:
 876         if (cq->is_kernel)
 877                 mthca_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 878
 879 err_out_mailbox:
 880         mthca_free_mailbox(dev, mailbox);
 881
 882 err_out_arm:
 883         if (cq->is_kernel && mthca_is_memfree(dev))
 884                 mthca_free_db(dev, MTHCA_DB_TYPE_CQ_ARM, cq->arm_db_index);
 885
 886 err_out_ci:
 887         if (cq->is_kernel && mthca_is_memfree(dev))
 888                 mthca_free_db(dev, MTHCA_DB_TYPE_CQ_SET_CI, cq->set_ci_db_index);
 889
 890 err_out_icm:
 891         mthca_table_put(dev, dev->cq_table.table, cq->cqn);
 892
 893 err_out:
 894         mthca_free(&dev->cq_table.alloc, cq->cqn);
 895
 896         return err;
 897 }
 898
 899 void mthca_free_cq(struct mthca_dev *dev,
 900                    struct mthca_cq *cq)
 901 {
 902         struct mthca_mailbox *mailbox;
 903         int err;
 904         u8 status;
 905
 906         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 907         if (IS_ERR(mailbox)) {
 908                 mthca_warn(dev, "No memory for mailbox to free CQ.\n");
 909                 return;
 910         }
 911
 912         err = mthca_HW2SW_CQ(dev, mailbox, cq->cqn, &status);
 913         if (err)
 914                 mthca_warn(dev, "HW2SW_CQ failed (%d)\n", err);
 915         else if (status)
 916                 mthca_warn(dev, "HW2SW_CQ returned status 0x%02x\n", status);
 917
 918         if (0) {
 919                 __be32 *ctx = mailbox->buf;
 920                 int j;
 921
 922                 printk(KERN_ERR "context for CQN %x (cons index %x, next sw %d)\n",
 923                        cq->cqn, cq->cons_index,
 924                        cq->is_kernel ? !!next_cqe_sw(cq) : 0);
 925                 for (j = 0; j < 16; ++j)
 926                         printk(KERN_ERR "[%2x] %08x\n", j * 4, be32_to_cpu(ctx[j]));
 927         }
 928
 929         spin_lock_irq(&dev->cq_table.lock);
 930         mthca_array_clear(&dev->cq_table.cq,
 931                           cq->cqn & (dev->limits.num_cqs - 1));
 932         spin_unlock_irq(&dev->cq_table.lock);
 933
 934         if (dev->mthca_flags & MTHCA_FLAG_MSI_X)
 935                 synchronize_irq(dev->eq_table.eq[MTHCA_EQ_COMP].msi_x_vector);
 936         else
 937                 synchronize_irq(dev->pdev->irq);
 938
 939         atomic_dec(&cq->refcount);
 940         wait_event(cq->wait, !atomic_read(&cq->refcount));
 941
 942         if (cq->is_kernel) {
 943                 mthca_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 944                 if (mthca_is_memfree(dev)) {
 945                         mthca_free_db(dev, MTHCA_DB_TYPE_CQ_ARM,    cq->arm_db_index);
 946                         mthca_free_db(dev, MTHCA_DB_TYPE_CQ_SET_CI, cq->set_ci_db_index);
 947                 }
 948         }
 949
 950         mthca_table_put(dev, dev->cq_table.table, cq->cqn);
 951         mthca_free(&dev->cq_table.alloc, cq->cqn);
 952         mthca_free_mailbox(dev, mailbox);
 953 }
 954
 955 int __devinit mthca_init_cq_table(struct mthca_dev *dev)
 956 {
 957         int err;
 958
 959         spin_lock_init(&dev->cq_table.lock);
 960
 961         err = mthca_alloc_init(&dev->cq_table.alloc,
 962                                dev->limits.num_cqs,
 963                                (1 << 24) - 1,
 964                                dev->limits.reserved_cqs);
 965         if (err)
 966                 return err;
 967
 968         err = mthca_array_init(&dev->cq_table.cq,
 969                                dev->limits.num_cqs);
 970         if (err)
 971                 mthca_alloc_cleanup(&dev->cq_table.alloc);
 972
 973         return err;
 974 }
 975
 976 void mthca_cleanup_cq_table(struct mthca_dev *dev)
 977 {
 978         mthca_array_cleanup(&dev->cq_table.cq, dev->limits.num_cqs);
 979         mthca_alloc_cleanup(&dev->cq_table.alloc);
 980 }