Testpmd forwards packets in checksum mode that it need to calculate
the checksum of each layer's protocol. Then it will fill flags and
header length into mbuf.

In process_outer_cksums, HW calculates the outer checksum if
tx_offloads contains outer UDP checksum otherwise SW calculates
the outer checksum.

When tx_offloads contains outer UDP checksum or outer IPv4 checksum,
mbuf will be filled with correct header length.

This patch added outer UDP checksum in tx_offload_capa and
I40E_TX_OFFLOAD_MASK, when we set csum hw outer-udp on that the
engine can forward outer IPv6 VXLAN packets.

Fixes: 399421100e08 ("net/i40e: fix missing mbuf fast free offload")
Cc: stable@dpdk.org

Signed-off-by: Jie Wang <redacted>
---
 drivers/net/i40e/i40e_ethdev.c | 1 +
 drivers/net/i40e/i40e_rxtx.c   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 62e374d19e..faf6391350 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c

@@ -3746,6 +3746,7 @@ i40e_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 		RTE_ETH_TX_OFFLOAD_IPIP_TNL_TSO |
 		RTE_ETH_TX_OFFLOAD_GENEVE_TNL_TSO |
 		RTE_ETH_TX_OFFLOAD_MULTI_SEGS |
+		RTE_ETH_TX_OFFLOAD_OUTER_UDP_CKSUM |
 		dev_info->tx_queue_offload_capa;
 	dev_info->dev_capa =
 		RTE_ETH_DEV_CAPA_RUNTIME_RX_QUEUE_SETUP |

diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 6ccb598677..41fe3bf481 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c

@@ -65,6 +65,7 @@
 		RTE_MBUF_F_TX_QINQ |       \
 		RTE_MBUF_F_TX_VLAN |	\
 		RTE_MBUF_F_TX_TUNNEL_MASK |	\
+		RTE_MBUF_F_TX_OUTER_UDP_CKSUM |	\
 		I40E_TX_IEEE1588_TMST)
 
 #define I40E_TX_OFFLOAD_NOTSUP_MASK \

-- 
2.25.1