netdev - Re: [PATCH 3/3] net: core: add IFLA

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Date:	Thu, 11 Mar 2010 14:50:59 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] net: core: add IFLA_STATS64 support

On Thu, 11 Mar 2010 23:13:18 +0100 (CET)
Jan Engelhardt <jengelh@...ozas.de> wrote:

> On Thursday 2010-03-11 23:04, Stephen Hemminger wrote:
> >> >> `ip -s link` shows interface counters truncated to 32 bit. This is
> >> >> because interface statistics are transported only in 32-bit quantity
> >> >> to userspace. This commit adds a new IFLA_STATS64 attribute that
> >> >> exports them in full 64 bit.
> >> 
> >> On 64-bit it has 64-bit counters, yet we only report 32-bit
> >> counters to userspace via netlink even in that case.
> >
> >That make sense, but maybe we shouldn't send IFLA_STATS64 on
> >32bit platforms.
> 
> Somehow I'd prefer to have consistency. Platform-specific 
> actions and/or payload I think we already were plagued enough by 
> syscalls and iptables. (Just to name two.)

But if you send 32bit truncated values when 64 bit is expected
then users are going to complain

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