app/testpmd: fix IPv6 tunnel checksum

When ipv6 packet is tunnel packet, "PKT_TX_OUTER_IPV6" flag must
be set, to let prepare the correct mbuf meta data for tx forward.

Fixes: 2b76648 ("net/e1000: add Tx preparation")
Cc: stable@dpdk.org

Signed-off-by: Jeff Guo <jia.guo@intel.com>

app/test-pmd/csumonly.c

@@ -417,7 +417,7 @@ process_outer_cksums(void *outer_l3_hdr, struct testpmd_offload_info *info,
 			ol_flags |= PKT_TX_OUTER_IP_CKSUM;
 		else
 			ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
-	} else if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_OUTER_IP_CKSUM)
+	} else
 		ol_flags |= PKT_TX_OUTER_IPV6;
 
 	if (info->outer_l4_proto != IPPROTO_UDP)
@@ -756,7 +756,9 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
 
 		if (info.is_tunnel == 1) {
 			if (info.tunnel_tso_segsz ||
-			    testpmd_ol_flags & TESTPMD_TX_OFFLOAD_OUTER_IP_CKSUM) {
+			    (testpmd_ol_flags &
+			    TESTPMD_TX_OFFLOAD_OUTER_IP_CKSUM) ||
+			    (tx_ol_flags & PKT_TX_OUTER_IPV6)) {
 				m->outer_l2_len = info.outer_l2_len;
 				m->outer_l3_len = info.outer_l3_len;
 				m->l2_len = info.l2_len;
@@ -826,8 +828,9 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
 					"m->l4_len=%d\n",
 					m->l2_len, m->l3_len, m->l4_len);
 			if (info.is_tunnel == 1) {
-				if (testpmd_ol_flags &
-				    TESTPMD_TX_OFFLOAD_OUTER_IP_CKSUM)
+				if ((testpmd_ol_flags &
+				    TESTPMD_TX_OFFLOAD_OUTER_IP_CKSUM) ||
+				    (tx_ol_flags & PKT_TX_OUTER_IPV6))
 					printf("tx: m->outer_l2_len=%d "
 						"m->outer_l3_len=%d\n",
 						m->outer_l2_len,