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

NAME
probe::netdev.transmit - Network device transmitting buffer
SYNOPSIS
netdev.transmit
VALUES
truesize
The size of the data to be transmitted.
length
The length of the transmit buffer.
protocol
The protocol of this packet(defined in include/linux/if_ether.h).
dev_name
The name of the device. e.g: eth0, ath1.
SystemTap Tapset Reference March 2016 PROBE::NETDEV.TRAN(3stap)