EtherateMT doesn't check interface MTU

[jwbensley]

bensley@ubuntu-htpc:~/c/EtherateMT$ sudo ./build/etherate_mt -I 6 -p1 -f 3000
Using inteface enp1s0f0 (6).
WARNING: Make sure your device supports baby giants or jumbo frames as required.
Setting interface promiscuous mode
Frame size set to 3000 bytes.
Using raw socket with PACKET_MMAP and TX/RX_RING v2.
Running in Tx mode.
16494:Trying to increase to 1048576 bytes...
16494:Write buffer size set to 425984 bytes
tx_bytes == 0
tx_bytes == 0
tx_bytes == 0
tx_bytes == 0
tx_bytes == 0
tx_bytes == 0
tx_bytes == 0
tx_bytes == 0

From: http://man7.org/linux/man-pages/man7/netdevice.7.html

   SIOCGIFMTU, SIOCSIFMTU
          Get or set the MTU (Maximum Transfer Unit) of a  device  using
          ifr_mtu.   Setting the MTU is a privileged operation.  Setting
          the MTU to too small values may cause kernel crashes.