netdev - Re: [PATCH] snmp: fix OutOctets counter to include forwarded datagrams

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Date:	Thu, 07 Jun 2012 14:53:26 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	bernat@...fy.cx
Cc:	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH] snmp: fix OutOctets counter to include forwarded
 datagrams

From: Vincent Bernat <bernat@...fy.cx>
Date: Tue,  5 Jun 2012 15:41:42 +0200

> RFC 4293 defines ipIfStatsOutOctets (similar definition for
> ipSystemStatsOutOctets):
> 
>    The total number of octets in IP datagrams delivered to the lower
>    layers for transmission.  Octets from datagrams counted in
>    ipIfStatsOutTransmits MUST be counted here.
> 
> And ipIfStatsOutTransmits:
> 
>    The total number of IP datagrams that this entity supplied to the
>    lower layers for transmission.  This includes datagrams generated
>    locally and those forwarded by this entity.
> 
> Therefore, IPSTATS_MIB_OUTOCTETS must be incremented when incrementing
> IPSTATS_MIB_OUTFORWDATAGRAMS.
> 
> IP_UPD_PO_STATS is not used since ipIfStatsOutRequests must not
> include forwarded datagrams:
> 
>    The total number of IP datagrams that local IP user-protocols
>    (including ICMP) supplied to IP in requests for transmission.  Note
>    that this counter does not include any datagrams counted in
>    ipIfStatsOutForwDatagrams.
> 
> Signed-off-by: Vincent Bernat <bernat@...fy.cx>

Applied, thanks for the detailed analysis.
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