linux-kernel - RE: [PATCH 5/7] I/OAT: Add support for MSI and MSI-X

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Message-ID: <BAE9DCEF64577A439B3A37F36F9B691C02B81AAF@orsmsx418.amr.corp.intel.com>
Date:	Fri, 20 Jul 2007 14:13:15 -0700
From:	"Nelson, Shannon" <shannon.nelson@...el.com>
To:	"Roland Dreier" <rdreier@...co.com>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
Cc:	<akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
	<davem@...emloft.net>, <jeff@...zik.org>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	"Leech, Christopher" <christopher.leech@...el.com>
Subject: RE: [PATCH 5/7] I/OAT: Add support for MSI and MSI-X

Roland Dreier [mailto:rdreier@...co.com] 
>
>OK, let's try to avoid going off into the weeds here.  In the context
>of the specific patch that this thread started with, is there any
>point in having both "msix-single-vector" and "msi" interrupt support?

Some versions of this hardware support MSI-X and not MSI.  If it can't
get all the MSI-X interrupts, it will try a single interrupt before
fallign all the way down to Legacy interrupts.  Basically, if we can
only get one interrupt, we'd still like to use the MSI-X mechanics if
possible.  If totally out of the question, then we'll use legacy.

sln
--
======================================================================
Mr. Shannon Nelson                 LAN Access Division, Intel Corp.
Shannon.Nelson@...el.com                I don't speak for Intel
(503) 712-7659                    Parents can't afford to be squeamish.
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