linux-kernel - RE: [PATCH net-next] hyperv: Add processing of MTU reduced by the host

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Message-ID: <c01728acfd564d779c1612539c65839e@DFM-DB3MBX15-06.exchange.corp.microsoft.com>
Date:	Wed, 12 Nov 2014 20:31:17 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	KY Srinivasan <kys@...rosoft.com>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>
Subject: RE: [PATCH net-next] hyperv: Add processing of MTU reduced by the
 host



> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: Wednesday, November 12, 2014 3:04 PM
> To: Haiyang Zhang
> Cc: netdev@...r.kernel.org; KY Srinivasan; olaf@...fle.de;
> jasowang@...hat.com; linux-kernel@...r.kernel.org; driverdev-
> devel@...uxdriverproject.org
> Subject: Re: [PATCH net-next] hyperv: Add processing of MTU reduced by
> the host
> 
> From: Haiyang Zhang <haiyangz@...rosoft.com>
> Date: Wed, 12 Nov 2014 20:02:11 +0000
> 
> > The Hyper-V host doesn't support MTU below 1500. If we try setting MTU
> to a
> > value < 1500, the host will use 1500 automatically and return 1500 in
> the
> > RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE query and guest will also use it.
> That's
> > why I set the lower limit to ETH_DATA_LEN.
> >
> > Are you suggesting that we keep the 68 as the lower limit, and let the
> host
> > auto-reset it to 1500 when we trying to set an MTU < 1500?
> 
> Then you need to add a comment, because without any information or
> context that change looks wrong.

I will add a comment.
Thanks,
- Haiyang
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