netdev - Re: [RFC] gro: Is it ok to share a single napi from several devs ?

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Message-ID: <lexmby2wgxuu9h0vljo2a16m.1283054830069@email.android.com>
Date:	Sat, 28 Aug 2010 21:07:10 -0700
From:	Stephen Hemminger <stephen.hemminger@...tta.com>
To:	David Miller <davem@...emloft.net>, shemminger@...tta.com
Cc:	eric.dumazet@...il.com, jarkao2@...il.com,
	herbert@...dor.apana.org.au, netdev@...r.kernel.org
Subject: Re: [RFC] gro: Is it ok to share a single napi from several devs ?

I am not really worried. about sky2 dual port since the dual port boards are rare. I might have one of the few in use 

David Miller <davem@...emloft.net> wrote:

>From: Stephen Hemminger <shemminger@...tta.com>
>Date: Sat, 28 Aug 2010 15:31:24 -0700
>
>> On Sat, 28 Aug 2010 14:41:30 -0700 (PDT)
>> David Miller <davem@...emloft.net> wrote:
>> 
>>> Since netpoll does similar things, this means both NAPI and netpoll
>>> cannot function properly with SKY2's second port.  It will only work
>>> right on the first port.
>> 
>> I knew netpoll was broken on second port.
>
>Well, now we know that GRO is too :-)
>
>If we wish to keep the one-to-one mapping of NAPI contexts to
>interrupt sources, what we can do is provide some kind of "dev list".
>
>The other option is to register two NAPI contexts and schedule them
>both on an interrupt.
>
>But in both cases, detecting the end of polling, and thus when to turn
>the interrupts back on, is non-trivial.
>
>I really don't like either solution, therefore, so I'll try to brain
>storm on this a bit more.