netdev - Re: [PATCH net] gso: do GSO for local skb with size bigger than MTU

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Message-ID: <20150113165824.GA14940@casper.infradead.org>
Date:	Tue, 13 Jan 2015 16:58:24 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Jesse Gross <jesse@...ira.com>
Cc:	Fan Du <fengyuleidian0615@...il.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	"Du, Fan" <fan.du@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	Jason Wang <jasowang@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"fw@...len.de" <fw@...len.de>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>,
	"pshelar@...ira.com" <pshelar@...ira.com>, fuscof@...il.com
Subject: Re: [PATCH net] gso: do GSO for local skb with size bigger than MTU

On 01/12/15 at 10:55am, Jesse Gross wrote:
> There are at least two parts to this:
>  * Calculating the right MTU for the guest device.
>  * Transferring the MTU from the host to the guest.
> 
> The first would presumably involve exposing some kind of API that the
> component that does know the right value could program. In this case,
> that component could be OVS using the same type of information that
> you just described in the earlier post about L3. The API could simply
> to just set the MTU of the device in the host and this gets mirrored
> to the guest.
> 
> The second part I guess is probably a fairly straightforward extension
> to virtio but I don't know the details.

Francesco Fusco wrote code to do exactly this. Maybe he still has
it somewhere.
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