netdev - query: ethtool --show-nfc mask interpretation

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Message-ID: <alpine.LNX.2.03.1407042034540.7230@ws.cisco>
Date:	Fri, 4 Jul 2014 21:43:12 +0530 (IST)
From:	Govindarajulu Varadarajan <_govind@....com>
To:	ben@...adent.org.uk, davem@...emloft.net
cc:	netdev@...r.kernel.org
Subject: query: ethtool --show-nfc mask interpretation

I was working on ethtool --show-nfc implementation for enic.

While displaying, ethtool displays the 1's compliment of
ethtool_rx_flow_spec->m_u.tcp_ip4_spec.psrc

I could not understand how to interpret the mask output

For eg.
[root@...3 linux-next]# ethtool -n enp9s0
8 RX rings available
Total 2 rules

Filter: 0
         Rule Type: TCP over IPv4
         Src IP addr: 10.65.79.1 mask: 255.255.0.0
         Dest IP addr: 10.106.186.163 mask: 255.255.255.255
         TOS: 0x0 mask: 0x0
         Src port: 51331 mask: 0xff
         Dest port: 22 mask: 0xffff
         Action: Direct to queue 4


The mask for src port is 0x00ff. Does that mean 8 bits in lsb should match and
the other 8 bits in msb should be ignored? Or is it the other way?

Thanks
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