The jumbo frame uses the 'RTE_ETHER_MAX_LEN' as boundary condition,
but the Ether overhead is larger than 18 when it supports dual VLAN tags.
That will cause the jumbo flag rx offload is wrong when MTU size is
'RTE_ETHER_MTU'.

This fix will change the boundary condition with 'RTE_ETHER_MTU' and
overhead, that perhaps impacts the cases of the jumbo frame related.

Fixes: 70d6b7f550f4 ("net/ipn3ke: add representor")

Reviewed-by: Rosen Xu <redacted>

Signed-off-by: Steve Yang <redacted>
---
 drivers/net/ipn3ke/ipn3ke_ethdev.h      | 1 +
 drivers/net/ipn3ke/ipn3ke_representor.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ipn3ke/ipn3ke_ethdev.h b/drivers/net/ipn3ke/ipn3ke_ethdev.h
index 9b0cf309c8..a6815a9cca 100644
--- a/drivers/net/ipn3ke/ipn3ke_ethdev.h
+++ b/drivers/net/ipn3ke/ipn3ke_ethdev.h

@@ -640,6 +640,7 @@ ipn3ke_tm_ops_get(struct rte_eth_dev *ethdev,
  */
 #define IPN3KE_ETH_OVERHEAD \
 	(RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN + IPN3KE_VLAN_TAG_SIZE * 2)
+#define IPN3KE_ETH_MAX_LEN (RTE_ETHER_MTU + IPN3KE_ETH_OVERHEAD)
 
 #define IPN3KE_MAC_FRAME_SIZE_MAX    9728
 #define IPN3KE_MAC_RX_FRAME_MAXLENGTH    0x00AE

diff --git a/drivers/net/ipn3ke/ipn3ke_representor.c b/drivers/net/ipn3ke/ipn3ke_representor.c
index 8a53602576..9e15cce34f 100644
--- a/drivers/net/ipn3ke/ipn3ke_representor.c
+++ b/drivers/net/ipn3ke/ipn3ke_representor.c

@@ -2801,7 +2801,7 @@ ipn3ke_rpst_mtu_set(struct rte_eth_dev *ethdev, uint16_t mtu)
 		return -EBUSY;
 	}
 
-	if (frame_size > RTE_ETHER_MAX_LEN)
+	if (frame_size > IPN3KE_ETH_MAX_LEN)
 		dev_data->dev_conf.rxmode.offloads |=
 			(uint64_t)(DEV_RX_OFFLOAD_JUMBO_FRAME);
 	else

-- 
2.17.1