net/dpaa2: fix jumbo frame flag condition for MTU set

[ upstream commit 043b571 ]

The jumbo frame uses the 'RTE_ETHER_MAX_LEN' as boundary condition,
but the Ether overhead is larger than 18 when it supports VLAN tag.
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: e164084 ("net/dpaa2: configure jumbo frames")

Signed-off-by: Steve Yang <stevex.yang@intel.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>

drivers/net/dpaa2/dpaa2_ethdev.c

@@ -1277,7 +1277,7 @@ dpaa2_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 	if (mtu < RTE_ETHER_MIN_MTU || frame_size > DPAA2_MAX_RX_PKT_LEN)
 		return -EINVAL;
 
-	if (frame_size > RTE_ETHER_MAX_LEN)
+	if (frame_size > DPAA2_ETH_MAX_LEN)
 		dev->data->dev_conf.rxmode.offloads |=
 						DEV_RX_OFFLOAD_JUMBO_FRAME;
 	else

drivers/net/dpaa2/dpaa2_ethdev.h

@@ -24,6 +24,10 @@
 #define MAX_TX_QUEUES		16
 #define MAX_DPNI		8
 
+#define DPAA2_ETH_MAX_LEN (RTE_ETHER_MTU + \
+			   RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN + \
+			   VLAN_TAG_SIZE)
+
 /*default tc to be used for ,congestion, distribution etc configuration. */
 #define DPAA2_DEF_TC		0