tap: Set the MTU on the TUN deivce
Type: fix
For a TAP device the MTU is set via the ethernet_register for TUN we
need to do it explicitly (like we do for other tunnel types).
@@ -66,6 +66,10 @@ VNET_HW_INTERFACE_CLASS (tun_device_hw_interface_class, static) =
};
/* *INDENT-ON* */
+#define TUN_MAX_PACKET_BYTES 65355
+#define TUN_MIN_PACKET_BYTES 64
+#define TUN_DEFAULT_PACKET_BYTES 1500
+
static u32
virtio_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi,
u32 flags)
@@ -741,6 +745,15 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
{
virtio_set_packet_coalesce (vif);
}
+ if (vif->type == VIRTIO_IF_TYPE_TUN)
+ {
+ hw->max_supported_packet_bytes = TUN_MAX_PACKET_BYTES;
+ hw->min_packet_bytes = hw->min_supported_packet_bytes =
+ TUN_MIN_PACKET_BYTES;
+ hw->max_packet_bytes =
+ args->host_mtu_size ? args->host_mtu_size : TUN_DEFAULT_PACKET_BYTES;
+ vnet_sw_interface_set_mtu (vnm, hw->sw_if_index, hw->max_packet_bytes);
+ }
virtio_vring_set_rx_queues (vm, vif);
