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+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.