drivers/infiniband/hw/cxgb3/iwch_cq.c

   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  */
  44 static 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         }
 180 out:
 181         if (wq)
 182                 spin_unlock(&qhp->lock);
 183         return ret;
 184 }
 185
 186 int 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 }