Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
probe::netdev.hard_transmit - Called when the devices is going to TX (hard)
SYNOPSIS
netdev.hard_transmit
VALUES
truesize
The size of the data to be transmitted.
length
The length of the transmit buffer.
protocol
The protocol used in the transmission
dev_name
The device scheduled to transmit
SystemTap Tapset Reference March 2016 PROBE::NETDEV.HARD(3stap)