net/enetc: 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: 5d5589b0c858 ("net/enetc: support MTU update and jumbo frames")
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/enetc/enetc.h b/drivers/net/enetc/enetc.h
index 14ef3bc..7163633 100644 (file)
--- a/drivers/net/enetc/enetc.h
+++ b/drivers/net/enetc/enetc.h
@@ -29,6 +29,10 @@
 /* maximum frame size supported */
 #define ENETC_MAC_MAXFRM_SIZE  9600
 
+/* The max frame size with default MTU */
+#define ENETC_ETH_MAX_LEN (RTE_ETHER_MTU + \
+               RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN)
+
 /*
  * upper_32_bits - return bits 32-63 of a number
  * @n: the number we're accessing

diff --git a/drivers/net/enetc/enetc_ethdev.c b/drivers/net/enetc/enetc_ethdev.c
index 6ff3022..4d2c9c0 100644 (file)
--- a/drivers/net/enetc/enetc_ethdev.c
+++ b/drivers/net/enetc/enetc_ethdev.c
@@ -677,7 +677,7 @@ enetc_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
                return -EINVAL;
        }
 
-       if (frame_size > RTE_ETHER_MAX_LEN)
+       if (frame_size > ENETC_ETH_MAX_LEN)
                dev->data->dev_conf.rxmode.offloads &=
                                                DEV_RX_OFFLOAD_JUMBO_FRAME;
        else