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

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: b58d8781fa1f ("net/axgbe: support setting MTU")
Cc: stable@dpdk.org
Signed-off-by: Steve Yang <stevex.yang@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/drivers/net/axgbe/axgbe_ethdev.c b/drivers/net/axgbe/axgbe_ethdev.c
index ddd9036..ebe9a28 100644 (file)
--- a/drivers/net/axgbe/axgbe_ethdev.c
+++ b/drivers/net/axgbe/axgbe_ethdev.c
@@ -1490,7 +1490,7 @@ static int axgb_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
                                dev->data->port_id);
                return -EBUSY;
        }
-       if (frame_size > RTE_ETHER_MAX_LEN) {
+       if (frame_size > AXGBE_ETH_MAX_LEN) {
                dev->data->dev_conf.rxmode.offloads |=
                        DEV_RX_OFFLOAD_JUMBO_FRAME;
                val = 1;

diff --git a/drivers/net/axgbe/axgbe_ethdev.h b/drivers/net/axgbe/axgbe_ethdev.h
index 1481fd9..a622672 100644 (file)
--- a/drivers/net/axgbe/axgbe_ethdev.h
+++ b/drivers/net/axgbe/axgbe_ethdev.h
@@ -125,6 +125,12 @@
 /* MDIO port types */
 #define AXGMAC_MAX_C22_PORT            3
 
+/* The max frame size with default MTU */
+#define AXGBE_ETH_MAX_LEN ( \
+       RTE_ETHER_MTU + \
+       RTE_ETHER_HDR_LEN + \
+       RTE_ETHER_CRC_LEN)
+
 /* Helper macro for descriptor handling
  *  Always use AXGBE_GET_DESC_DATA to access the descriptor data
  *  since the index is free-running and needs to be and-ed