What: /sys/class/net/<iface>/dsa/tagging Date: August 2018 KernelVersion: 4.20 Contact: netdev@vger.kernel.org Description: On read, this file returns a string indicating the type of tagging protocol used by the DSA network devices that are attached to this master interface. On write, this file changes the tagging protocol of the attached DSA switches, if this operation is supported by the driver. Changing the tagging protocol must be done with the DSA interfaces and the master interface all administratively down. See the "name" field of each registered struct dsa_device_ops for a list of valid values.