[dpdk-dev] Question about driver/controller MTU enforcement with MTU less than jumbo frame size

[Bruce Richardson]

On Tue, May 09, 2017 at 09:02:24PM +0000, Coulson, Ken wrote:
> Is it possible to have an MTU enforced on rx that is less than jumbo size frames?
> From the DPDK driver code snippet for ixgbe if MTU < 1518 then the jumbo_frame control bit in the chip is set to 0.
> The controller manual says the maximum frame size is only meaningful when the jumbo_frame control bit is 1.
> Does it work to leave jumbo_frame set to 1 but set max frame size to something smaller than the jumbo size of 1518?
> 

I believe it should work, but I haven't ever tested it to confirm.

/Bruce