From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <nhorman@tuxdriver.com>
Received: from smtp.tuxdriver.com (charlotte.tuxdriver.com [70.61.120.58])
 by dpdk.org (Postfix) with ESMTP id EF2F7B0BC
 for <dev@dpdk.org>; Wed, 11 Jun 2014 12:30:01 +0200 (CEST)
Received: from hmsreliant.think-freely.org
 ([2001:470:8:a08:7aac:c0ff:fec2:933b] helo=localhost)
 by smtp.tuxdriver.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.63)
 (envelope-from <nhorman@tuxdriver.com>)
 id 1WufnC-0006hB-Ly; Wed, 11 Jun 2014 06:30:14 -0400
Date: Wed, 11 Jun 2014 06:30:05 -0400
From: Neil Horman <nhorman@tuxdriver.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Message-ID: <20140611103005.GA19777@hmsreliant.think-freely.org>
References: <20140606212644.203613327@networkplumber.org>
 <0E29434AEE0C3A4180987AB476A6F630593A5E2D@IRSMSX101.ger.corp.intel.com>
 <20140610104035.08d3946a@nehalam.linuxnetplumber.net>
 <0E29434AEE0C3A4180987AB476A6F630593A5F6C@IRSMSX101.ger.corp.intel.com>
 <20140610134709.03524b62@nehalam.linuxnetplumber.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20140610134709.03524b62@nehalam.linuxnetplumber.net>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-Spam-Score: -2.9 (--)
X-Spam-Status: No
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 00/10] igb_uio patches
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Wed, 11 Jun 2014 10:30:02 -0000

On Tue, Jun 10, 2014 at 01:47:09PM -0700, Stephen Hemminger wrote:
> On Tue, 10 Jun 2014 19:26:08 +0000
> "Carew, Alan" <alan.carew@intel.com> wrote:
> 
> > One alternative for us is then to take Neil Horman's idea of scanning /sys/bus/pci/devices/<D:B:D.F>/msi_irqs/
> > This gives us at least (MSI | MSI-X) | INT-X, however the Virtio specification mentions MSI-X explicitly for determining the correct offset and might not address the underlying problem my patch set was addressing, I have not tried Virtio with MSI.
> 
> MSI doesn't work with virtio. pci_enable_msi() returns error. The device
> does not report MSI capability.
> 
/sys/bus/pci/devices/<device>/irq

also indicates which legacy irq is assigned to a given device

Neil