netdev - Re: IGMP Join dropping multicast packets

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Date:	Wed, 18 Mar 2009 22:46:30 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jesse.brandeburg@...el.com
Cc:	daveboutcher@...il.com, dada1@...mosbay.com,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net
Subject: Re: IGMP Join dropping multicast packets

From: "Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Date: Wed, 18 Mar 2009 10:24:18 -0700 (Pacific Daylight Time)

> Interesting, this code has been there for eons (and probably this 
> behavior) but that doesn't mean its not a problem.
> 
> We are in the process of figuring out if there are any hardware corner 
> cases to changing this code (particularly in e1000)
> 
> Initial thoughts are:
> 1) kcalloc an array that we then populate with the hash functions, and 
>    then program every location only once (never flush)
> 2) only program a single hash value each time a multicast is added (bad 
>    because we can't tell the difference in the list since the last time 
>    the OS gave us the list)
> 
> It really seems like this should be fixable, and I agree that the driver 
> behavior is far from optimal, however well entrenched.

Just do what tg3 does to fix this now, get fancy and "beautiful"
later.
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