linux-kernel - Re: [PATCH] IB/rxe: add RXE_START_MASK for rxe_opcode IB_OPCODE_RC_SEND_ONLY

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Message-ID: <f2df9d02-8693-60e6-e4fd-24c81817b898@oracle.com>
Date:   Thu, 26 Apr 2018 12:02:40 +0800
From:   Yanjun Zhu <yanjun.zhu@...cle.com>
To:     Jianchao Wang <jianchao.w.wang@...cle.com>, monis@...lanox.com,
        dledford@...hat.com, jgg@...pe.ca
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/rxe: add RXE_START_MASK for rxe_opcode
 IB_OPCODE_RC_SEND_ONLY_INV



On 2018/4/26 11:52, Jianchao Wang wrote:
> w/o RXE_START_MASK, the last_psn of IB_OPCODE_RC_SEND_ONLY_INV
> will not be updated in update_wqe_psn, and the corresponding
> wqe will not be acked in rxe_completer due to its last_psn is
> zero. Finally, the other wqe will also not be able to be acked,
> because the wqe of IB_OPCODE_RC_SEND_ONLY_INV with last_psn 0
> is still there. This causes large amount of io timeout when
> nvmeof is over rxe.
>
> Add RXE_START_MASK for IB_OPCODE_RC_SEND_ONLY_INV to fix this.
>
> Signed-off-by: Jianchao Wang <jianchao.w.wang@...cle.com>

Reviewed-by: Zhu Yanjun <yanjun.zhu@...cle.com>

> ---
>   drivers/infiniband/sw/rxe/rxe_opcode.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/infiniband/sw/rxe/rxe_opcode.c b/drivers/infiniband/sw/rxe/rxe_opcode.c
> index 61927c1..4cf1106 100644
> --- a/drivers/infiniband/sw/rxe/rxe_opcode.c
> +++ b/drivers/infiniband/sw/rxe/rxe_opcode.c
> @@ -390,7 +390,7 @@ struct rxe_opcode_info rxe_opcode[RXE_NUM_OPCODE] = {
>   		.name	= "IB_OPCODE_RC_SEND_ONLY_INV",
>   		.mask	= RXE_IETH_MASK | RXE_PAYLOAD_MASK | RXE_REQ_MASK
>   				| RXE_COMP_MASK | RXE_RWR_MASK | RXE_SEND_MASK
> -				| RXE_END_MASK,
> +				| RXE_END_MASK  | RXE_START_MASK,
>   		.length = RXE_BTH_BYTES + RXE_IETH_BYTES,
>   		.offset = {
>   			[RXE_BTH]	= 0,