+ When set to 1, Tx doesn't wait for max number of packets to get
+ coalesced and sends the packets immediately at the end of the
+ current Tx burst. When set to 0, Tx waits across multiple Tx bursts
+ until the max number of packets have been coalesced. In this case,
+ Tx only sends the coalesced packets to hardware once the max
+ coalesce limit has been reached.