RDMA/hns: Fix incorrect lsn field

In RNR NAK screnario, according to the specification, when no credit is
available, only the first fragment of the send request can be sent. The
LSN(Limit Sequence Number) field should be 0 or the entire packet will be
resent.

Fixes: 926a01dc000d ("RDMA/hns: Add QP operations support for hip08 SoC")
Link: https://lore.kernel.org/r/1629883169-2306-1-git-send-email-liangwenpeng@huawei.com
Signed-off-by: Yixing Liu <liuyixing1@huawei.com>
Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index d00be78a2931a06fca341f0a9ef27f9bc4881551..198a0c6861f5014011cb042adcba46bb1f26afac 100644 (file)
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -4483,9 +4483,6 @@ static int modify_qp_rtr_to_rts(struct ib_qp *ibqp,
 
        hr_reg_clear(qpc_mask, QPC_CHECK_FLG);
 
-       hr_reg_write(context, QPC_LSN, 0x100);
-       hr_reg_clear(qpc_mask, QPC_LSN);
-
        hr_reg_clear(qpc_mask, QPC_V2_IRRL_HEAD);
 
        return 0;