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

[Salil Mehta]

From: Lijun Ou <ouli...@huawei.com>

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

Signed-off-by: Lijun Ou <ouli...@huawei.com>
Signed-off-by: Dongdong Huang(Donald) <hdd.hu...@huawei.com>
Reviewed-by:  Wei Hu (Xavier) <xavier.hu...@huawei.com>
Signed-off-by: Salil Mehta <salil.me...@huawei.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