net/liquidio: 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: 9f1c00266d82 ("net/liquidio: add API to set 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/liquidio/lio_ethdev.c b/drivers/net/liquidio/lio_ethdev.c
index d4dd376..eb0fdab 100644 (file)
--- a/drivers/net/liquidio/lio_ethdev.c
+++ b/drivers/net/liquidio/lio_ethdev.c
@@ -481,7 +481,7 @@ lio_dev_mtu_set(struct rte_eth_dev *eth_dev, uint16_t mtu)
                return -1;
        }
 
-       if (frame_len > RTE_ETHER_MAX_LEN)
+       if (frame_len > LIO_ETH_MAX_LEN)
                eth_dev->data->dev_conf.rxmode.offloads |=
                        DEV_RX_OFFLOAD_JUMBO_FRAME;
        else

diff --git a/drivers/net/liquidio/lio_ethdev.h b/drivers/net/liquidio/lio_ethdev.h
index 74cd2fb..d33be1c 100644 (file)
--- a/drivers/net/liquidio/lio_ethdev.h
+++ b/drivers/net/liquidio/lio_ethdev.h
@@ -13,6 +13,9 @@
 #define LIO_LSC_TIMEOUT                100000 /* 100000us (100ms) */
 #define LIO_MAX_CMD_TIMEOUT     10000 /* 10000ms (10s) */
 
+/* The max frame size with default MTU */
+#define LIO_ETH_MAX_LEN (RTE_ETHER_MTU + RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN)
+
 #define LIO_DEV(_eth_dev)              ((_eth_dev)->data->dev_private)
 
 /* LIO Response condition variable */