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

[ upstream commit e542ab5 ]

The jumbo frame uses the 'RTE_ETHER_MAX_LEN' as boundary condition.
If 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 normalize the boundary condition with 'RTE_ETHER_MTU'
and overhead even though current overhead is 18.

Fixes: 254bd84 ("net/hinic: set jumbo frame offload flag")

Signed-off-by: Steve Yang <stevex.yang@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

drivers/net/hinic/hinic_pmd_ethdev.c

@@ -75,6 +75,9 @@
 #define HINIC_PKTLEN_TO_MTU(pktlen)	\
 	((pktlen) - (ETH_HLEN + ETH_CRC_LEN))
 
+/* The max frame size with default MTU */
+#define HINIC_ETH_MAX_LEN (RTE_ETHER_MTU + ETH_HLEN + ETH_CRC_LEN)
+
 /* lro numer limit for one packet */
 #define HINIC_LRO_WQE_NUM_DEFAULT	8
 
@@ -1556,7 +1559,7 @@ static int hinic_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
 
 	/* update max frame size */
 	frame_size = HINIC_MTU_TO_PKTLEN(mtu);
-	if (frame_size > RTE_ETHER_MAX_LEN)
+	if (frame_size > HINIC_ETH_MAX_LEN)
 		dev->data->dev_conf.rxmode.offloads |=
 			DEV_RX_OFFLOAD_JUMBO_FRAME;
 	else