netdev - Re: [PATCH] r8169: Add counters tx_bytes and rx

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Date:	Wed, 26 May 2010 08:51:45 +0800
From:	Junchang Wang <junchangwang@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	romieu@...zoreil.com, netdev@...r.kernel.org
Subject: Re: [PATCH] r8169: Add counters tx_bytes and rx_bytes for ethtool

Hi David,
Thanks for your advice.

>
> If the problem is that people want 64-bit counters available for core
> statistics on 32-bit systems, we do not fix that problem by hacking
> every single driver to provide them side-band via ethtool.

Most NICs have provided those two 64-bit counters in hardware. They
work fine even in 32-bit systems and don't need new 64-bit counters
any more. Frankly, r8169 is the first Gbps NIC I have seen that does
not support those two counters. So I thought changing upper layer is
immoderate and tried to provide a cheap but valuable way.

>
> First of all, we now have "struct rtnl_link_stats64" in
> linux/if_link.h, it's there to start combating this problem
> generically, for every device, rather than the way you are trying
> handle it only for one specific driver at a time.

Thanks for your advice. I'll go deep into it and see how we can solve
this problem.

-- 
--Junchang
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