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: 3151e6a687a3 ("net/octeontx: support MTU")

Acked-by: Harman Kalra <redacted>

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

diff --git a/drivers/net/octeontx/octeontx_ethdev.c b/drivers/net/octeontx/octeontx_ethdev.c
index 3ee7b043fd..81779885d5 100644
--- a/drivers/net/octeontx/octeontx_ethdev.c
+++ b/drivers/net/octeontx/octeontx_ethdev.c

@@ -552,7 +552,7 @@ octeontx_dev_mtu_set(struct rte_eth_dev *eth_dev, uint16_t mtu)
 	if (rc)
 		return rc;
 
-	if (frame_size > RTE_ETHER_MAX_LEN)
+	if (frame_size > OCCTX_L2_MAX_LEN)
 		nic->rx_offloads |= DEV_RX_OFFLOAD_JUMBO_FRAME;
 	else
 		nic->rx_offloads &= ~DEV_RX_OFFLOAD_JUMBO_FRAME;

diff --git a/drivers/net/octeontx/octeontx_ethdev.h b/drivers/net/octeontx/octeontx_ethdev.h
index 7246fb6d1d..780a094ffa 100644
--- a/drivers/net/octeontx/octeontx_ethdev.h
+++ b/drivers/net/octeontx/octeontx_ethdev.h

@@ -44,6 +44,7 @@
 /* ETH_HLEN+ETH_FCS+2*VLAN_HLEN */
 #define OCCTX_L2_OVERHEAD	(RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN + \
 				 OCCTX_MAX_VTAG_ACT_SIZE)
+#define OCCTX_L2_MAX_LEN	(RTE_ETHER_MTU + OCCTX_L2_OVERHEAD)
 
 /* Since HW FRS includes NPC VTAG insertion space, user has reduced FRS */
 #define OCCTX_MAX_FRS	\

-- 
2.17.1