linux-kernel - [PATCH V2 for-next 12/19] IB/hns: The Ack timeout need a lower limit value

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Date:   Tue, 20 Sep 2016 17:07:05 +0100
From:   Salil Mehta <salil.mehta@...wei.com>
To:     <dledford@...hat.com>
CC:     <salil.mehta@...wei.com>, <xavier.huwei@...wei.com>,
        <oulijun@...wei.com>, <yisen.zhuang@...wei.com>,
        <mehta.salil.lnk@...il.com>, <xuwei5@...ilicon.com>,
        <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, Dongdong Huang <hdd.huang@...wei.com>
Subject: [PATCH V2 for-next 12/19] IB/hns: The Ack timeout need a lower limit value

From: Lijun Ou <oulijun@...wei.com>

The Ack timeout of qpc need a lower limit value,otherwise
the read performance will be very lower.

Signed-off-by: Lijun Ou <oulijun@...wei.com>
Signed-off-by: Dongdong Huang(Donald) <hdd.huang@...wei.com>
Reviewed-by:  Wei Hu (Xavier) <xavier.huwei@...wei.com>
Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v1.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
index 1205d1a..5110a18 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
@@ -2410,10 +2410,19 @@ static int hns_roce_v1_m_qp(struct ib_qp *ibqp, const struct ib_qp_attr *attr,
 			       QP_CONTEXT_QPC_BYTES_156_RETRY_COUNT_INIT_M,
 			       QP_CONTEXT_QPC_BYTES_156_RETRY_COUNT_INIT_S,
 			       attr->retry_cnt);
-		roce_set_field(context->qpc_bytes_156,
-			       QP_CONTEXT_QPC_BYTES_156_ACK_TIMEOUT_M,
-			       QP_CONTEXT_QPC_BYTES_156_ACK_TIMEOUT_S,
-			       attr->timeout);
+		if (attr->timeout < 0x12) {
+			dev_info(dev, "ack timeout value(0x%x) must bigger than 0x12.\n",
+				 attr->timeout);
+			roce_set_field(context->qpc_bytes_156,
+				       QP_CONTEXT_QPC_BYTES_156_ACK_TIMEOUT_M,
+				       QP_CONTEXT_QPC_BYTES_156_ACK_TIMEOUT_S,
+				       0x12);
+		} else {
+			roce_set_field(context->qpc_bytes_156,
+				       QP_CONTEXT_QPC_BYTES_156_ACK_TIMEOUT_M,
+				       QP_CONTEXT_QPC_BYTES_156_ACK_TIMEOUT_S,
+				       attr->timeout);
+		}
 		roce_set_field(context->qpc_bytes_156,
 			       QP_CONTEXT_QPC_BYTES_156_RNR_RETRY_COUNT_INIT_M,
 			       QP_CONTEXT_QPC_BYTES_156_RNR_RETRY_COUNT_INIT_S,
-- 
1.9.1