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 'HSN3_DEFAULT_FRAME_LEN',
that perhaps impacts the cases of the jumbo frame related.

Fixes: 1f5ca0b460cd ("net/hns3: support some device operations")
Fixes: a5475d61fa34 ("net/hns3: support VF")

Cc: "Min Hu (Connor)" <redacted>
Cc: Yisen Zhuang <redacted>
Cc: Lijun Ou <redacted>

Acked-by: Lijun Ou <redacted>

Signed-off-by: Steve Yang <redacted>
---
 drivers/net/hns3/hns3_ethdev.c    | 2 +-
 drivers/net/hns3/hns3_ethdev_vf.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hns3/hns3_ethdev.c b/drivers/net/hns3/hns3_ethdev.c
index 7c34e382fb..10e0c0de46 100644
--- a/drivers/net/hns3/hns3_ethdev.c
+++ b/drivers/net/hns3/hns3_ethdev.c

@@ -2467,7 +2467,7 @@ hns3_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 	}
 
 	rte_spinlock_lock(&hw->lock);
-	is_jumbo_frame = frame_size > RTE_ETHER_MAX_LEN ? true : false;
+	is_jumbo_frame = frame_size > HNS3_DEFAULT_FRAME_LEN ? true : false;
 	frame_size = RTE_MAX(frame_size, HNS3_DEFAULT_FRAME_LEN);
 
 	/*

diff --git a/drivers/net/hns3/hns3_ethdev_vf.c b/drivers/net/hns3/hns3_ethdev_vf.c
index f09cabcd82..ef03fb1c4e 100644
--- a/drivers/net/hns3/hns3_ethdev_vf.c
+++ b/drivers/net/hns3/hns3_ethdev_vf.c

@@ -928,7 +928,7 @@ hns3vf_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 		rte_spinlock_unlock(&hw->lock);
 		return ret;
 	}
-	if (frame_size > RTE_ETHER_MAX_LEN)
+	if (mtu > RTE_ETHER_MTU)
 		dev->data->dev_conf.rxmode.offloads |=
 						DEV_RX_OFFLOAD_JUMBO_FRAME;
 	else

-- 
2.17.1