linux-kernel - Re: [dpdk-dev] [PATCH 2/2] uio: new driver to support PCI MSI-X

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Message-ID: <20151001170452.0e6a90c2@urahara>
Date:	Thu, 1 Oct 2015 17:04:52 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Alexander Duyck <alexander.duyck@...il.com>
Cc:	hjk@...sjkoch.de, gregkh@...ux-foundation.org, dev@...k.org,
	linux-kernel@...r.kernel.org
Subject: Re: [dpdk-dev] [PATCH 2/2] uio: new driver to support PCI MSI-X

On Thu, 1 Oct 2015 16:40:10 -0700
Alexander Duyck <alexander.duyck@...il.com> wrote:

> Do you really need to map IORESOURCE bars?  Most drivers I can think of 
> don't use IO BARs anymore.  Maybe we could look at just dropping the 
> code and adding it back later if we have a use case that absolutely 
> needs it.
Mapping is not strictly necessary, but for virtio it acts a way to communicate
the regions.

> Also how many devices actually need resources beyond BAR 0?  I'm just 
> curious as I know BAR 2 on many of the Intel devices is the register 
> space related to MSI-X so now we have both the PCIe subsystem and user 
> space with access to this region.

VMXNet3 needs 2 bars. Most use only one.
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