linux/drivers/infiniband/hw/cxgb3/iwch_cq.c
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   1/*
   2 * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
   3 *
   4 * This software is available to you under a choice of one of two
   5 * licenses.  You may choose to be licensed under the terms of the GNU
   6 * General Public License (GPL) Version 2, available from the file
   7 * COPYING in the main directory of this source tree, or the
   8 * OpenIB.org BSD license below:
   9 *
  10 *     Redistribution and use in source and binary forms, with or
  11 *     without modification, are permitted provided that the following
  12 *     conditions are met:
  13 *
  14 *      - Redistributions of source code must retain the above
  15 *        copyright notice, this list of conditions and the following
  16 *        disclaimer.
  17 *
  18 *      - Redistributions in binary form must reproduce the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer in the documentation and/or other materials
  21 *        provided with the distribution.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30 * SOFTWARE.
  31 */
  32#include "iwch_provider.h"
  33#include "iwch.h"
  34
  35/*
  36 * Get one cq entry from cxio and map it to openib.
  37 *
  38 * Returns:
  39 *      0                       EMPTY;
  40 *      1                       cqe returned
  41 *      -EAGAIN         caller must try again
  42 *      any other -errno        fatal error
  43 */
  44static int iwch_poll_cq_one(struct iwch_dev *rhp, struct iwch_cq *chp,
  45                            struct ib_wc *wc)
  46{
  47        struct iwch_qp *qhp = NULL;
  48        struct t3_cqe cqe, *rd_cqe;
  49        struct t3_wq *wq;
  50        u32 credit = 0;
  51        u8 cqe_flushed;
  52        u64 cookie;
  53        int ret = 1;
  54
  55        rd_cqe = cxio_next_cqe(&chp->cq);
  56
  57        if (!rd_cqe)
  58                return 0;
  59
  60        qhp = get_qhp(rhp, CQE_QPID(*rd_cqe));
  61        if (!qhp)
  62                wq = NULL;
  63        else {
  64                spin_lock(&qhp->lock);
  65                wq = &(qhp->wq);
  66        }
  67        ret = cxio_poll_cq(wq, &(chp->cq), &cqe, &cqe_flushed, &cookie,
  68                                   &credit);
  69        if (t3a_device(chp->rhp) && credit) {
  70                PDBG("%s updating %d cq credits on id %d\n", __FUNCTION__,
  71                     credit, chp->cq.cqid);
  72                cxio_hal_cq_op(&rhp->rdev, &chp->cq, CQ_CREDIT_UPDATE, credit);
  73        }
  74
  75        if (ret) {
  76                ret = -EAGAIN;
  77                goto out;
  78        }
  79        ret = 1;
  80
  81        wc->wr_id = cookie;
  82        wc->qp = &qhp->ibqp;
  83        wc->vendor_err = CQE_STATUS(cqe);
  84
  85        PDBG("%s qpid 0x%x type %d opcode %d status 0x%x wrid hi 0x%x "
  86             "lo 0x%x cookie 0x%llx\n", __FUNCTION__,
  87             CQE_QPID(cqe), CQE_TYPE(cqe),
  88             CQE_OPCODE(cqe), CQE_STATUS(cqe), CQE_WRID_HI(cqe),
  89             CQE_WRID_LOW(cqe), (unsigned long long) cookie);
  90
  91        if (CQE_TYPE(cqe) == 0) {
  92                if (!CQE_STATUS(cqe))
  93                        wc->byte_len = CQE_LEN(cqe);
  94                else
  95                        wc->byte_len = 0;
  96                wc->opcode = IB_WC_RECV;
  97        } else {
  98                switch (CQE_OPCODE(cqe)) {
  99                case T3_RDMA_WRITE:
 100                        wc->opcode = IB_WC_RDMA_WRITE;
 101                        break;
 102                case T3_READ_REQ:
 103                        wc->opcode = IB_WC_RDMA_READ;
 104                        wc->byte_len = CQE_LEN(cqe);
 105                        break;
 106                case T3_SEND:
 107                case T3_SEND_WITH_SE:
 108                        wc->opcode = IB_WC_SEND;
 109                        break;
 110                case T3_BIND_MW:
 111                        wc->opcode = IB_WC_BIND_MW;
 112                        break;
 113
 114                /* these aren't supported yet */
 115                case T3_SEND_WITH_INV:
 116                case T3_SEND_WITH_SE_INV:
 117                case T3_LOCAL_INV:
 118                case T3_FAST_REGISTER:
 119                default:
 120                        printk(KERN_ERR MOD "Unexpected opcode %d "
 121                               "in the CQE received for QPID=0x%0x\n",
 122                               CQE_OPCODE(cqe), CQE_QPID(cqe));
 123                        ret = -EINVAL;
 124                        goto out;
 125                }
 126        }
 127
 128        if (cqe_flushed)
 129                wc->status = IB_WC_WR_FLUSH_ERR;
 130        else {
 131
 132                switch (CQE_STATUS(cqe)) {
 133                case TPT_ERR_SUCCESS:
 134                        wc->status = IB_WC_SUCCESS;
 135                        break;
 136                case TPT_ERR_STAG:
 137                        wc->status = IB_WC_LOC_ACCESS_ERR;
 138                        break;
 139                case TPT_ERR_PDID:
 140                        wc->status = IB_WC_LOC_PROT_ERR;
 141                        break;
 142                case TPT_ERR_QPID:
 143                case TPT_ERR_ACCESS:
 144                        wc->status = IB_WC_LOC_ACCESS_ERR;
 145                        break;
 146                case TPT_ERR_WRAP:
 147                        wc->status = IB_WC_GENERAL_ERR;
 148                        break;
 149                case TPT_ERR_BOUND:
 150                        wc->status = IB_WC_LOC_LEN_ERR;
 151                        break;
 152                case TPT_ERR_INVALIDATE_SHARED_MR:
 153                case TPT_ERR_INVALIDATE_MR_WITH_MW_BOUND:
 154                        wc->status = IB_WC_MW_BIND_ERR;
 155                        break;
 156                case TPT_ERR_CRC:
 157                case TPT_ERR_MARKER:
 158                case TPT_ERR_PDU_LEN_ERR:
 159                case TPT_ERR_OUT_OF_RQE:
 160                case TPT_ERR_DDP_VERSION:
 161                case TPT_ERR_RDMA_VERSION:
 162                case TPT_ERR_DDP_QUEUE_NUM:
 163                case TPT_ERR_MSN:
 164                case TPT_ERR_TBIT:
 165                case TPT_ERR_MO:
 166                case TPT_ERR_MSN_RANGE:
 167                case TPT_ERR_IRD_OVERFLOW:
 168                case TPT_ERR_OPCODE:
 169                        wc->status = IB_WC_FATAL_ERR;
 170                        break;
 171                case TPT_ERR_SWFLUSH:
 172                        wc->status = IB_WC_WR_FLUSH_ERR;
 173                        break;
 174                default:
 175                        printk(KERN_ERR MOD "Unexpected cqe_status 0x%x for "
 176                               "QPID=0x%0x\n", CQE_STATUS(cqe), CQE_QPID(cqe));
 177                        ret = -EINVAL;
 178                }
 179        }
 180out:
 181        if (wq)
 182                spin_unlock(&qhp->lock);
 183        return ret;
 184}
 185
 186int iwch_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 187{
 188        struct iwch_dev *rhp;
 189        struct iwch_cq *chp;
 190        unsigned long flags;
 191        int npolled;
 192        int err = 0;
 193
 194        chp = to_iwch_cq(ibcq);
 195        rhp = chp->rhp;
 196
 197        spin_lock_irqsave(&chp->lock, flags);
 198        for (npolled = 0; npolled < num_entries; ++npolled) {
 199#ifdef DEBUG
 200                int i=0;
 201#endif
 202
 203                /*
 204                 * Because T3 can post CQEs that are _not_ associated
 205                 * with a WR, we might have to poll again after removing
 206                 * one of these.
 207                 */
 208                do {
 209                        err = iwch_poll_cq_one(rhp, chp, wc + npolled);
 210#ifdef DEBUG
 211                        BUG_ON(++i > 1000);
 212#endif
 213                } while (err == -EAGAIN);
 214                if (err <= 0)
 215                        break;
 216        }
 217        spin_unlock_irqrestore(&chp->lock, flags);
 218
 219        if (err < 0)
 220                return err;
 221        else {
 222                return npolled;
 223        }
 224}
 225