netdev - Re: [PATCH] b44: add 64 bit stats

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Date:	Fri, 20 Jul 2012 07:24:25 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Kevin Groeneveld <kgroeneveld@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] b44: add 64 bit stats

On Fri, 2012-07-20 at 06:53 +0200, Eric Dumazet wrote:
> On Thu, 2012-07-19 at 21:56 -0400, Kevin Groeneveld wrote:
> 
> > I am still trying to make sure I understand this fully.  I want to
> > update some other drivers with 64 bit stats as well.  What you said
> > seems to make sense, but...
> > 
> > I was looking at the virtio_net.c driver.  One spot in this driver
> > which updates the stats is the receive_buf function.  recive_buf is
> > called from virtnet_poll which is registered as a napi poll function.
> > According to Documentation/networking/netdevices.txt the poll function
> > is called in a softirq context.  However, the function which reads the
> > stats uses u64_stats_fetch_begin/u64_stats_fetch_retry.  Shouldn't
> > this be u64_stats_fetch_begin_bh/u64_stats_fetch_retry_bh for the
> > exact reasons you described for my b44 patch?
> 
> Absolutely. You can argue that probably nobody use this driver on a
> 32bit UP machine, but technically speaking the current implementation is
> racy.
> 

In fact all network drivers should use the _bh version.

Could you send a patch for all of them, based on net-next tree ?

Thanks !


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