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Date: Fri, 11 Mar 2005 15:23:33 -0800
From: Sam Leffler <sam@errno.com>
Organization: Errno Consulting
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To: Pawel Jakub Dawidek <pjd@freebsd.org>
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cc: dima <_pppp@mail.ru>
cc: John Baldwin <jhb@freebsd.org>
cc: Luigi Rizzo <rizzo@icir.org>
cc: rwatson@freebsd.org
cc: Julian Elischer <julian@elischer.org>
cc: net@freebsd.org
Subject: Re: Giant-free polling [PATCH]
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Pawel Jakub Dawidek wrote:
> On Fri, Mar 11, 2005 at 01:14:38PM -0800, Julian Elischer wrote:
> +> >P> There is still an unresolved problem (in your and our patch as well) of
> +> >P> using ifnet structure fields without synchronization, as we don't have
> +> >P> access tointerface's internal mutex, which protects those fields.
> +> > 
> +> >
> +> 
> +> you need to add an interface method that has access to it..
> 
> I was thinking more about moving interface mutex into ifnet structure,
> but Robert has some objections IIRC.
> 

I don't know what Robert's objections are but I've considered doing it 
for a while to deal with some locking issues in net80211-based drivers. 
  The only issue I can see is if this mutex boxes drivers into a locking 
model that interlocks the rx+tx paths.

	Sam