net/i40e: fix tunnel packet Tx descriptor

[ upstream commit e8b1a5dd7df3e7a3f87b469e1b007d560d46d7f2 ]

The TX descriptor of tunnel packet filled incorrectly due to the MACLEN
is not set.

This patch fixes this issue by setting MACLEN to correctly fill the
TX descriptor.

Fixes: c59faf3 ("net/i40e: support TSO on tunneling packet")

Signed-off-by: Shiyang He <shiyangx.he@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

drivers/net/i40e/i40e_rxtx.c

@@ -304,10 +304,7 @@ i40e_txd_enable_checksum(uint64_t ol_flags,
 			union i40e_tx_offload tx_offload)
 {
 	/* Set MACLEN */
-	if (ol_flags & RTE_MBUF_F_TX_TUNNEL_MASK)
-		*td_offset |= (tx_offload.outer_l2_len >> 1)
-				<< I40E_TX_DESC_LENGTH_MACLEN_SHIFT;
-	else
+	if (!(ol_flags & RTE_MBUF_F_TX_TUNNEL_MASK))
 		*td_offset |= (tx_offload.l2_len >> 1)
 			<< I40E_TX_DESC_LENGTH_MACLEN_SHIFT;
 
@@ -1171,9 +1168,12 @@ i40e_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 
 		/* Fill in tunneling parameters if necessary */
 		cd_tunneling_params = 0;
-		if (ol_flags & RTE_MBUF_F_TX_TUNNEL_MASK)
+		if (ol_flags & RTE_MBUF_F_TX_TUNNEL_MASK) {
+			td_offset |= (tx_offload.outer_l2_len >> 1)
+					<< I40E_TX_DESC_LENGTH_MACLEN_SHIFT;
 			i40e_parse_tunneling_params(ol_flags, tx_offload,
 						    &cd_tunneling_params);
+		}
 		/* Enable checksum offloading */
 		if (ol_flags & I40E_TX_CKSUM_OFFLOAD_MASK)
 			i40e_txd_enable_checksum(ol_flags, &td_cmd,