net: hns3: fix for vxlan gpe tx checksum bug

stable inclusion
from stable-5.10.38
commit 90120c475dd7267541db416ce9490257f0bb15f7
bugzilla: 51875
CVE: NA

--------------------------------

[ Upstream commit 905416f1 ]

When skb->ip_summed is CHECKSUM_PARTIAL, for non-tunnel udp packet,
which has a dest port as the IANA assigned, the hardware is expected
to do the checksum offload, but the hardware whose version is below
V3 will not do the checksum offload when udp dest port is 4790.

So fixes it by doing the checksum in software for this case.

Fixes: 76ad4f0e ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")
Signed-off-by: NHao Chen <chenhao288@hisilicon.com>
Signed-off-by: NHuazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

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

@@ -778,7 +778,7 @@ static int hns3_get_l4_protocol(struct sk_buff *skb, u8 *ol4_proto,
  * and it is udp packet, which has a dest port as the IANA assigned.
  * the hardware is expected to do the checksum offload, but the
  * hardware will not do the checksum offload when udp dest port is
- * 4789 or 6081.
+ * 4789, 4790 or 6081.
  */
 static bool hns3_tunnel_csum_bug(struct sk_buff *skb)
 {
@@ -788,7 +788,8 @@ static bool hns3_tunnel_csum_bug(struct sk_buff *skb)
 
 	if (!(!skb->encapsulation &&
 	      (l4.udp->dest == htons(IANA_VXLAN_UDP_PORT) ||
-	      l4.udp->dest == htons(GENEVE_UDP_PORT))))
+	      l4.udp->dest == htons(GENEVE_UDP_PORT) ||
+	      l4.udp->dest == htons(4790))))
 		return false;
 
 	skb_checksum_help(skb);