[dpdk-dev] [PATCH 2/4] enic: set the max allowed MTU for the NIC

Bruce Richardson bruce.richardson at intel.com
Fri Jun 24 13:01:03 CEST 2016

On Fri, Jun 24, 2016 at 11:59:19AM +0100, Bruce Richardson wrote:
> On Thu, Jun 16, 2016 at 10:22:47PM -0700, John Daley wrote:
> > The max MTU is set to the max egress packet size allowed by the VIC
> > minus the size of a an IPv4 L2 header with .1Q (18 bytes).
> > 
> I think a bit more detail might be needed here. For example:
> * What was the MTU set to by default before this patch is applied? Was it just
> set to 1518 or something else?
> * What happens, if anything, if buffers bigger than the MTU size are sent down?
This is obviously referring to buffers bigger than MTU on TX. There is also the
question of what happens if buffer sizes smaller than MTU are provided on RX.

> /Bruce

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