[dpdk-dev] [PATCH v1 02/12] net/e1000: fix the jumbo frame flag condition for mtu set

[Steve Yang]

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'.

Fixes: ef990fb56e55 ("net/e1000: convert to new Rx offloads API")

Signed-off-by: Steve Yang <stevex.y...@intel.com>
---
 drivers/net/e1000/em_ethdev.c  | 2 +-
 drivers/net/e1000/igb_ethdev.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/e1000/em_ethdev.c b/drivers/net/e1000/em_ethdev.c
index 8ee9422bf4..044858f567 100644
--- a/drivers/net/e1000/em_ethdev.c
+++ b/drivers/net/e1000/em_ethdev.c
@@ -1816,7 +1816,7 @@ eth_em_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
        rctl = E1000_READ_REG(hw, E1000_RCTL);
 
        /* switch to jumbo mode if needed */
-       if (frame_size > RTE_ETHER_MAX_LEN) {
+       if (mtu > RTE_ETHER_MTU) {
                dev->data->dev_conf.rxmode.offloads |=
                        DEV_RX_OFFLOAD_JUMBO_FRAME;
                rctl |= E1000_RCTL_LPE;
diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index 647aa8d995..d31964558d 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -4369,7 +4369,7 @@ eth_igb_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
        rctl = E1000_READ_REG(hw, E1000_RCTL);
 
        /* switch to jumbo mode if needed */
-       if (frame_size > RTE_ETHER_MAX_LEN) {
+       if (mtu > RTE_ETHER_MTU) {
                dev->data->dev_conf.rxmode.offloads |=
                        DEV_RX_OFFLOAD_JUMBO_FRAME;
                rctl |= E1000_RCTL_LPE;
-- 
2.17.1