netdev - Re: [PATCH net-next] bnx2x: Disable LRO on FCoE or iSCSI boot device

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Message-ID: <C27F8246C663564A84BB7AB34397724266D2018306@IRVEXCHCCR01.corp.ad.broadcom.com>
Date:	Fri, 14 Oct 2011 09:15:39 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"'Rick Jones'" <rick.jones2@...com>
cc:	"'davem@...emloft.net'" <davem@...emloft.net>,
	"'netdev@...r.kernel.org'" <netdev@...r.kernel.org>,
	"Dmitry Kravkov" <dmitry@...adcom.com>,
	"Eilon Greenstein" <eilong@...adcom.com>
Subject: Re: [PATCH net-next] bnx2x: Disable LRO on FCoE or iSCSI boot
 device

Rick Jones wrote:

> On 10/14/2011 08:53 AM, Michael Chan wrote:
> > Rick Jones wrote:
> >
> >> Is this perhaps saying that a bnx2x-driven device being used for
> >> FCoE or iSCSI boot must not permit *any* run-time configuration
> >> change which leads to a NIC reset?
> >>
> >
> > That is right.  Unless you have a multipath configuration with
> multiple
> > ports, then you can reset one port at a time.
> 
> So, should there also be a "cnic_boot_device" check in many of the
> "capital letter" ethtool paths?
> 

If the user is doing ethtool configuration changes or device shutdown,
it is more obvious what the consequence will be.  The user may also be
careful to do it on a multipath setup.

The reset caused by the auto turn-off of LRO when you enable
ip_forward or bridging will not be obvious to the user.  In addition,
all devices with LRO turned on will be reset at the same time so even
multipath will not survive.

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