3.To get more specific statistics, use the grep command on the output of ethtool -
S:
#ethtool -S eth9 grep tx_pac tx_packets: 8645339 tx_packets: 3418334 tx_packets: 26 tx_packets: 0 tx_packets: 22 tx_packets: 401791 tx_packets: 1466540 tx_packets: 0 tx_packets: 21 tx_packets: 725 tx_packets: 3357880 tx_packets: 0 tx_packets: 0