Changing MTU on cxgbe

[Navdeep Parhar]

On Fri, May 27, 2016 at 12:57:34AM -0400, Garrett Wollman wrote:
> In article <CAJpsHY4vF5Ky6GuAusLOOROgiQuyD2CcRmVxu8x3cArQRZxcbg at mail.gmail.com> you write:
> 
> ># ifconfig -m cxgbe0
> >cxgbe0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST>
> 
> ># ifconfig cxgbe0 mtu 9000
> >ifconfig: ioctl SIOCSIFMTU (set mtu): Invalid argument
> 
> I believe this device, like many others, does not allow the MTU (or
> actually the MRU) to be changed once the receive ring has been set up

This is not correct.  You can change the MTU of a cxgbe/cxl interface at
any time (whether it's up or down, passing traffic or idle, etc.).

Regards,
Navdeep