netdev - Re: [PATCH net-next 2/4] udp: Handle large UFO packets from untrusted sources

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Message-ID: <4A2F4A0B.3020205@us.ibm.com>
Date:	Tue, 09 Jun 2009 22:52:11 -0700
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Herbert Xu <herbert@...dor.apana.org.au>, davem@...emloft.net,
	netdev@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH net-next 2/4] udp: Handle large UFO packets from untrusted
 sources

Rusty Russell wrote:
> On Mon, 8 Jun 2009 02:46:08 pm Herbert Xu wrote:
>   
>> On Fri, Jun 05, 2009 at 05:16:31PM -0700, Sridhar Samudrala wrote:
>>     
>>> +	/* Software UFO is not yet supported */
>>> +	segs = ERR_PTR(-EPROTONOSUPPORT);
>>>       
>> Hmm, we need to fill this in before you start using it for virt.
>> After all, it's very difficult for the guest to know whether the
>> output device on the host is going to be able to do UFO or not.
>>     
>
> Yep, no point telling the guest we support UFO if we don't!
>   
This path is taken only when the packet needs to go out a device that 
doesn't support UFO.
Until the software UFO is supported, I thought it may be useful to 
provide a way to enable
UFO inter-guest, between host to guest and to an external host via an 
outgoing device that supports UFO.

Thanks
Sridhar

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