linux-kernel - [for-next PATCH 08/10] RDMA/rxe: Implement flush completion

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Date:   Tue,  6 Dec 2022 21:01:59 +0800
From:   Li Zhijian <lizhijian@...itsu.com>
To:     Bob Pearson <rpearsonhpe@...il.com>,
        Leon Romanovsky <leon@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org
Cc:     Zhu Yanjun <zyjzyj2000@...il.com>, yangx.jy@...itsu.com,
        y-goto@...itsu.com, mbloch@...dia.com, tom@...pey.com,
        tomasz.gromadzki@...el.com, dan.j.williams@...el.com,
        linux-kernel@...r.kernel.org, Li Zhijian <lizhijian@...itsu.com>
Subject: [for-next PATCH 08/10] 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.

Reviewed-by: Zhu Yanjun <zyjzyj2000@...il.com>
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
 drivers/infiniband/sw/rxe/rxe_comp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_comp.c b/drivers/infiniband/sw/rxe/rxe_comp.c
index 1c525325e271..20737fec392b 100644
--- 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;
 		}
-- 
2.31.1