netdev - Re: [RFC][PATCH 1/1] cxgb3i: cxgb3 iSCSI initiator

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Message-ID: <aday73jxdfs.fsf@cisco.com>
Date:	Wed, 30 Jul 2008 14:35:51 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	Karen Xie <kxie@...lsio.com>, netdev@...r.kernel.org,
	open-iscsi@...glegroups.com, davem@...emloft.net,
	michaelc@...wisc.edu, swise@...ngridcomputing.com,
	daisyc@...ibm.com, wenxiong@...ibm.com, bhua@...ibm.com,
	divy@...lsio.com, dm@...lsio.com, leedom@...lsio.com,
	linux-scsi <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 1/1] cxgb3i: cxgb3 iSCSI initiator

 > * From a networking standpoint, our main concern becomes how this
 > interacts with the networking stack.  In particular, I'm concerned
 > based on reading the source that this driver uses "TCP port stealing"
 > rather than using a totally separate MAC address (and IP).
 > 
 > Stealing a TCP port on an IP/interface already assigned is a common
 > solution in this space, but also a flawed one.  Precisely because the
 > kernel and applications are unaware of this "special, magic TCP port"
 > you open the potential for application problems that are very
 > difficult for an admin to diagnose based on observed behavior.

That's true, but using a separate MAC and IP opens up a bunch of other
operational problems.  I don't think the right answer for iSCSI offload
is clear yet.

 - R.
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