RDMA/rxe: Implement flush completion

Per IBA SPEC, FLUSH will ack in rdma read response with 0 length.

Use IB_WC_FLUSH (aka IB_UVERBS_WC_FLUSH) code to tell userspace a FLUSH
completion.

Link: https://lore.kernel.org/r/20221206130201.30986-9-lizhijian@fujitsu.com
Reviewed-by: Zhu Yanjun <zyjzyj2000@gmail.com>
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/sw/rxe/rxe_comp.c b/drivers/infiniband/sw/rxe/rxe_comp.c
index 1c525325e27165c60c95bee9838cb863111909a2..20737fec392bf7efae659316c4afbbfaddfab998 100644 (file)
--- a/drivers/infiniband/sw/rxe/rxe_comp.c
+++ b/drivers/infiniband/sw/rxe/rxe_comp.c
@@ -105,6 +105,7 @@ static enum ib_wc_opcode wr_to_wc_opcode(enum ib_wr_opcode opcode)
        case IB_WR_REG_MR:                      return IB_WC_REG_MR;
        case IB_WR_BIND_MW:                     return IB_WC_BIND_MW;
        case IB_WR_ATOMIC_WRITE:                return IB_WC_ATOMIC_WRITE;
+       case IB_WR_FLUSH:                       return IB_WC_FLUSH;
 
        default:
                return 0xff;
@@ -278,7 +279,8 @@ static inline enum comp_state check_ack(struct rxe_qp *qp,
                 */
        case IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE:
                if (wqe->wr.opcode != IB_WR_RDMA_READ &&
-                   wqe->wr.opcode != IB_WR_RDMA_READ_WITH_INV) {
+                   wqe->wr.opcode != IB_WR_RDMA_READ_WITH_INV &&
+                   wqe->wr.opcode != IB_WR_FLUSH) {
                        wqe->status = IB_WC_FATAL_ERR;
                        return COMPST_ERROR;
                }