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

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Message-Id: <20080814.152300.127682912.davem@davemloft.net>
Date:	Thu, 14 Aug 2008 15:23:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	gallatin@...i.com
Cc:	rick.jones2@...com, rdreier@...co.com, jgarzik@...ox.com,
	swise@...ngridcomputing.com, divy@...lsio.com, kxie@...lsio.com,
	netdev@...r.kernel.org, open-iscsi@...glegroups.com,
	michaelc@...wisc.edu, daisyc@...ibm.com, wenxiong@...ibm.com,
	bhua@...ibm.com, dm@...lsio.com, lee@...per.es
Subject: Re: [RFC][PATCH 1/1] cxgb3i: cxgb3 iSCSI initiator

From: Andrew Gallatin <gallatin@...i.com>
Date: Thu, 14 Aug 2008 16:45:57 -0400

> Speaking of stateless data placement.  Assume you have a page or set
> of pages allocated by a network driver which contain exactly the data
> a block driver is interested in to fulfill a read request (eg, the NIC
> understands the protocol just well enough to split headers).  Is it
> possible in the block driver to simply replace the pages that are
> attached to the buf with pages allocated by the network driver?
> 
> It was my impression that the pages associated with a buf are in
> fairly magical states and that you cannot replace them.

This, if true, would be quite easy to rectify.
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