app/testpmd: fix IPv6 tunnel packet checksum error

In checksum forwarding mode, the checksum of tunnel packet calculated
incorrectly when outer header is IPv6.

This patch fixes the issue by setting L4 checksum flag.

Fixes: daa02b5 ("mbuf: add namespace to offload flags")
Cc: stable@dpdk.org

Signed-off-by: Shiyang He <shiyangx.he@intel.com>
Signed-off-by: 0-day Robot <robot@bytheb.org>

app/test-pmd/csumonly.c

@@ -582,7 +582,7 @@ process_outer_cksums(void *outer_l3_hdr, struct testpmd_offload_info *info,
 		else
 			ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
 	} else
-		ol_flags |= RTE_MBUF_F_TX_OUTER_IPV6;
+		ol_flags |= RTE_MBUF_F_TX_OUTER_IPV6 | RTE_MBUF_F_TX_L4_MASK;
 
 	if (info->outer_l4_proto != IPPROTO_UDP)
 		return ol_flags;