linux-kernel - Re: [PATCH 1/3] net: introduce a list of device addresses dev_addr

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Message-ID: <49E5BB4F.2060607@trash.net>
Date:	Wed, 15 Apr 2009 12:47:43 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	David Miller <davem@...emloft.net>
CC:	dada1@...mosbay.com, jpirko@...hat.com, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jgarzik@...ox.com, shemminger@...ux-foundation.org,
	bridge@...ts.linux-foundation.org, fubar@...ibm.com,
	bonding-devel@...ts.sourceforge.net, mschmidt@...hat.com,
	ivecera@...hat.com
Subject: Re: [PATCH 1/3] net: introduce a list of device addresses dev_addr_list

David Miller wrote:
> From: Patrick McHardy <kaber@...sh.net>
> Date: Wed, 15 Apr 2009 12:41:01 +0200
> 
>> Herbert (I think) suggested to make address list updates in softirq
>> context a two-step process, where addresses would first be added to
>> a temporary list and the final change would be done in process context
>> while holding the RTNL.
>>
>> Given the complicated mess we currently have, this would be a very
>> worthwhile change IMO.
> 
> This would break the IPV6 TAHI tests if you think we could use
> such an idea for that.
> 
> When IPV6 packets arrive that influence multicast and unicast
> address lists, the effect must be essentially immediate.  Such
> that a subsequent packet will cause the kernel the behave
> with the necessary side effects, no matter how quickly that
> next packet arrives.

I see, thanks for the explanation.

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