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Date: Fri, 9 Sep 2016 18:30:45 +0800
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>,
<xuwei5@...ilicon.com>, <mehta.salil.lnk@...il.com>,
<linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linuxarm@...wei.com>,
"Dongdong Huang(Donald)" <hdd.huang@...wei.com>
Subject: [PATCH for-next 14/20] 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 e3e154c..836a2af 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
@@ -2428,10 +2428,19 @@ 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,
--
1.7.9.5
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