netdev - RE: Question regarding protocol specific mtu for FCoE

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Message-Id: <1244057245.3191.17.camel@achroite>
Date:	Wed, 03 Jun 2009 20:27:25 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	"Zou, Yi" <yi.zou@...el.com>
Cc:	Rick Jones <rick.jones2@...com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"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: RE: Question regarding protocol specific mtu for FCoE

On Wed, 2009-06-03 at 12:16 -0700, Zou, Yi wrote:
[...]
> FCoE is on L2 layer, no path specific MTU, everything goes out as
> whatever mtu known to the nic. Since the nic is expected to be used for
> converged traffic involving multiple traffic types, e.g. LAN, FCoE, I
> was wondering if it makes sense to have the additional MTU. Essentially,
> the nic driver will be able to setup via netdev for different MTUs for
> converged traffic.

Wouldn't you use separate VLANs for FCoE and other traffic?  So maybe we
should allow for per-VLAN rather than per-protocol MTU.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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