netdev - Question regarding protocol specific mtu for FCoE

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Date:	Wed, 3 Jun 2009 10:56:41 -0700
From:	"Zou, Yi" <yi.zou@...el.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"Leech, Christopher" <christopher.leech@...el.com>,
	"Dev, Vasu" <vasu.dev@...el.com>,
	"Love, Robert W" <robert.w.love@...el.com>,
	"Ma, Steve" <steve.ma@...el.com>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: Question regarding protocol specific mtu for FCoE

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

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