Question regarding protocol specific mtu for FCoE

Zou, Yi
2009-06-03T17:56:41Z

Hi,
I am trying to figure out a way to support a different MTU for Fiber
Channel over Ethernet (FCoE), where it is preferred to have a baby jumbo
frame with MTU=2158 (14 bytes FCoE header + 24 bytes FC header + 2112
bytes max FC payload + 4 bytes FC CRC + 4 bytes FCoE trailer).

Similar to nedev->mtu being used everywhere for LAN traffic, I wonder if
it is desirable or feasible to add another protocol specific MTU (which
is my case is FCoE) to netdev so any eth driver supporting converged
traffic (e.g. LAN + FCoE) over netdev can make use of it.

Thanks.

Yi Zou