These fields need to be set in order for the userspace or DSA drivers to change the MTU to bigger or smaller values. They default to 68 and 1500 respectively. Since the hardware supports wider limits, it is all benefit to set them. Specially when connecting a DSA switch, the DSA code wants to set the MTU of the cpsw port to 1500 + tag size. This was failing without this change. Signed-off-by: Alexandre Bard <alexandre.bard@xxxxxxxxxxxxx> --- drivers/net/ethernet/ti/cpsw.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index ed66c4d4d830..83d8c6a8a527 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -1631,6 +1631,9 @@ static int cpsw_probe(struct platform_device *pdev) eth_hw_addr_set(ndev, priv->mac_addr); + ndev->min_mtu = CPSW_MIN_PACKET_SIZE; + ndev->max_mtu = CPSW_MAX_PACKET_SIZE; + cpsw->slaves[0].ndev = ndev; ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_CTAG_RX; -- 2.20.1
