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

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',
that perhaps impacts the cases of the jumbo frame related.

Fixes: ff6a1197c3b1 ("net/sfc: convert to new Rx offload API")
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/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
index 93fc7ba..f2f5336 100644 (file)
--- a/drivers/net/sfc/sfc_ethdev.c
+++ b/drivers/net/sfc/sfc_ethdev.c
@@ -1017,7 +1017,7 @@ sfc_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
         * The driver does not use it, but other PMDs update jumbo frame
         * flag and max_rx_pkt_len when MTU is set.
         */
-       if (mtu > RTE_ETHER_MAX_LEN) {
+       if (mtu > RTE_ETHER_MTU) {
                struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
                rxmode->offloads |= DEV_RX_OFFLOAD_JUMBO_FRAME;
        }