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

[Haiyang Zhang]

> -----Original Message-----
> From: David Miller [mailto:davem at davemloft.net]
> Sent: Wednesday, November 12, 2014 3:04 PM
> To: Haiyang Zhang
> Cc: netdev at vger.kernel.org; KY Srinivasan; olaf at aepfle.de;
> jasowang at redhat.com; linux-kernel at vger.kernel.org; driverdev-
> devel at linuxdriverproject.org
> Subject: Re: [PATCH net-next] hyperv: Add processing of MTU reduced by
> the host
> 
> From: Haiyang Zhang <haiyangz at microsoft.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