Mayle was promoted to the active roster Wednesday, David Helman of the Cowboys' official site reports.
In the wake of TE Geoff Swaim's (pectoral) placement on injured reserve Wednesday, Mayle was called to the active roster in order to serve in an H-back type of role. However, it isn't clear how much playing time he'll be afforded right off the bat with Jason Witten and Gavin Escobar available to serve in similar functions.