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From: Govindarajulu Varadarajan <_govind@gmx.com>
To: ben@decadent.org.uk, davem@davemloft.net
Cc: netdev@vger.kernel.org
Subject: query: ethtool --show-nfc mask interpretation
Date: Fri, 4 Jul 2014 21:43:12 +0530 (IST)	[thread overview]
Message-ID: <alpine.LNX.2.03.1407042034540.7230@ws.cisco> (raw)

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@a163 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

             reply	other threads:[~2014-07-04 16:13 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-04 16:13 Govindarajulu Varadarajan [this message]
2014-07-07  1:36 ` query: ethtool --show-nfc mask interpretation Ben Hutchings

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