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

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

From: Haiyang Zhang <haiyangz@microsoft.com>
Date: Wed, 12 Nov 2014 20:02:11 +0000

quoted

The Hyper-V host doesn't support MTU below 1500. If we try setting MTU

to a

quoted

value < 1500, the host will use 1500 automatically and return 1500 in

the

quoted

RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE query and guest will also use it.

That's

quoted

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

quoted

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