net: hns3: fix GRE checksum offload issue

[ Upstream commit f9f6512 ]

The device_version V3 hardware can't offload the checksum for IP in GRE
packets, but can do it for NvGRE. So default to disable the checksum and
GSO offload for GRE, but keep the ability to enable it when only using
NvGRE.

Fixes: 76ad4f0 ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")
Signed-off-by: Jie Wang <wangjie125@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

@@ -3352,6 +3352,15 @@ static void hns3_set_default_feature(struct net_device *netdev)
 		  NETIF_F_HW_TC);
 
 	netdev->hw_enc_features |= netdev->vlan_features | NETIF_F_TSO_MANGLEID;
+
+	/* The device_version V3 hardware can't offload the checksum for IP in
+	 * GRE packets, but can do it for NvGRE. So default to disable the
+	 * checksum and GSO offload for GRE.
+	 */
+	if (ae_dev->dev_version > HNAE3_DEVICE_VERSION_V2) {
+		netdev->features &= ~NETIF_F_GSO_GRE;
+		netdev->features &= ~NETIF_F_GSO_GRE_CSUM;
+	}
 }
 
 static int hns3_alloc_buffer(struct hns3_enet_ring *ring,