Provided by: systemtap-doc_3.1-3ubuntu0.1_all 

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