From: Lijun Ou <oulijun@huawei.com>
Date: Sun, 30 Sep 2018 17:00:32 +0800
Subject: RDMA/hns: Configure ecn field of ip header
Patch-mainline: v4.20-rc1
Git-commit: 157b52a08da68b650a6b5bcaf427d39a5d016a36
References: bsc#1104427 FATE#326416

In order to compatible with the third party RoCE device, The hardware
modify the set method for the ecn field of ip header in new hip08
version. The high 6bit of tclass be assigned for dscp field of packet.

Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -3640,8 +3640,15 @@ static int hns_roce_v2_modify_qp(struct
 			       V2_QPC_BYTE_24_HOP_LIMIT_M,
 			       V2_QPC_BYTE_24_HOP_LIMIT_S, 0);
 
-		roce_set_field(context->byte_24_mtu_tc, V2_QPC_BYTE_24_TC_M,
-			       V2_QPC_BYTE_24_TC_S, grh->traffic_class);
+		if (hr_dev->pci_dev->revision == 0x21 &&
+		    gid_attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
+			roce_set_field(context->byte_24_mtu_tc,
+				       V2_QPC_BYTE_24_TC_M, V2_QPC_BYTE_24_TC_S,
+				       grh->traffic_class >> 2);
+		else
+			roce_set_field(context->byte_24_mtu_tc,
+				       V2_QPC_BYTE_24_TC_M, V2_QPC_BYTE_24_TC_S,
+				       grh->traffic_class);
 		roce_set_field(qpc_mask->byte_24_mtu_tc, V2_QPC_BYTE_24_TC_M,
 			       V2_QPC_BYTE_24_TC_S, 0);
 		roce_set_field(context->byte_28_at_fl, V2_QPC_BYTE_28_FL_M,