drivers/infiniband/sw/siw/siw_cq.c

   1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
   2
   3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
   4 /* Copyright (c) 2008-2019, IBM Corporation */
   5
   6 #include <linux/errno.h>
   7 #include <linux/types.h>
   8
   9 #include <rdma/ib_verbs.h>
  10
  11 #include "siw.h"
  12
  13 static int map_wc_opcode[SIW_NUM_OPCODES] = {
  14         [SIW_OP_WRITE] = IB_WC_RDMA_WRITE,
  15         [SIW_OP_SEND] = IB_WC_SEND,
  16         [SIW_OP_SEND_WITH_IMM] = IB_WC_SEND,
  17         [SIW_OP_READ] = IB_WC_RDMA_READ,
  18         [SIW_OP_READ_LOCAL_INV] = IB_WC_RDMA_READ,
  19         [SIW_OP_COMP_AND_SWAP] = IB_WC_COMP_SWAP,
  20         [SIW_OP_FETCH_AND_ADD] = IB_WC_FETCH_ADD,
  21         [SIW_OP_INVAL_STAG] = IB_WC_LOCAL_INV,
  22         [SIW_OP_REG_MR] = IB_WC_REG_MR,
  23         [SIW_OP_RECEIVE] = IB_WC_RECV,
  24         [SIW_OP_READ_RESPONSE] = -1 /* not used */
  25 };
  26
  27 static struct {
  28         enum siw_wc_status siw;
  29         enum ib_wc_status ib;
  30 } map_cqe_status[SIW_NUM_WC_STATUS] = {
  31         { SIW_WC_SUCCESS, IB_WC_SUCCESS },
  32         { SIW_WC_LOC_LEN_ERR, IB_WC_LOC_LEN_ERR },
  33         { SIW_WC_LOC_PROT_ERR, IB_WC_LOC_PROT_ERR },
  34         { SIW_WC_LOC_QP_OP_ERR, IB_WC_LOC_QP_OP_ERR },
  35         { SIW_WC_WR_FLUSH_ERR, IB_WC_WR_FLUSH_ERR },
  36         { SIW_WC_BAD_RESP_ERR, IB_WC_BAD_RESP_ERR },
  37         { SIW_WC_LOC_ACCESS_ERR, IB_WC_LOC_ACCESS_ERR },
  38         { SIW_WC_REM_ACCESS_ERR, IB_WC_REM_ACCESS_ERR },
  39         { SIW_WC_REM_INV_REQ_ERR, IB_WC_REM_INV_REQ_ERR },
  40         { SIW_WC_GENERAL_ERR, IB_WC_GENERAL_ERR }
  41 };
  42
  43 /*
  44  * Reap one CQE from the CQ. Only used by kernel clients
  45  * during CQ normal operation. Might be called during CQ
  46  * flush for user mapped CQE array as well.
  47  */
  48 int siw_reap_cqe(struct siw_cq *cq, struct ib_wc *wc)
  49 {
  50         struct siw_cqe *cqe;
  51         unsigned long flags;
  52
  53         spin_lock_irqsave(&cq->lock, flags);
  54
  55         cqe = &cq->queue[cq->cq_get % cq->num_cqe];
  56         if (READ_ONCE(cqe->flags) & SIW_WQE_VALID) {
  57                 memset(wc, 0, sizeof(*wc));
  58                 wc->wr_id = cqe->id;
  59                 wc->status = map_cqe_status[cqe->status].ib;
  60                 wc->opcode = map_wc_opcode[cqe->opcode];
  61                 wc->byte_len = cqe->bytes;
  62
  63                 /*
  64                  * During CQ flush, also user land CQE's may get
  65                  * reaped here, which do not hold a QP reference
  66                  * and do not qualify for memory extension verbs.
  67                  */
  68                 if (likely(rdma_is_kernel_res(&cq->base_cq.res))) {
  69                         if (cqe->flags & SIW_WQE_REM_INVAL) {
  70                                 wc->ex.invalidate_rkey = cqe->inval_stag;
  71                                 wc->wc_flags = IB_WC_WITH_INVALIDATE;
  72                         }
  73                         wc->qp = cqe->base_qp;
  74                         siw_dbg_cq(cq,
  75                                    "idx %u, type %d, flags %2x, id 0x%pK\n",
  76                                    cq->cq_get % cq->num_cqe, cqe->opcode,
  77                                    cqe->flags, (void *)(uintptr_t)cqe->id);
  78                 }
  79                 WRITE_ONCE(cqe->flags, 0);
  80                 cq->cq_get++;
  81
  82                 spin_unlock_irqrestore(&cq->lock, flags);
  83
  84                 return 1;
  85         }
  86         spin_unlock_irqrestore(&cq->lock, flags);
  87
  88         return 0;
  89 }
  90
  91 /*
  92  * siw_cq_flush()
  93  *
  94  * Flush all CQ elements.
  95  */
  96 void siw_cq_flush(struct siw_cq *cq)
  97 {
  98         struct ib_wc wc;
  99
 100         while (siw_reap_cqe(cq, &wc))
 101                 ;
 102 }