From: Stephen Hemminger <shemminger@linux-foundation.org>
To: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: netdev@vger.kernel.org
Subject: Re: [RFC] skge: limit DMA to 32 bit
Date: Tue, 21 Sep 2010 08:02:53 -0700 [thread overview]
Message-ID: <20100921080253.3d89d60a@nehalam> (raw)
In-Reply-To: <20100921071518.GA9081@redhat.com>
On Tue, 21 Sep 2010 09:15:19 +0200
Stanislaw Gruszka <sgruszka@redhat.com> wrote:
> We have old fedora bug report about not working skge device on some
> Gigabyte motherboard:
> https://bugzilla.redhat.com/show_bug.cgi?id=447489
>
> In dmesg there are messages:
>
> skge 0000:02:0b.0: PCI error cmd=0x7 status=0x22b0
> skge 0000:02:0b.0: unable to clear error (so ignoring them)
>
> Status value 0x22b0 include PCI_STATUS_REC_MASTER_ABORT bit set, what
> mean that DMA transfer on PCI bus was aborted.
>
> I provided to user modified driver with module parameter, that allow
> to experiment with different dma_mask's. He told that maximum working
> dma_mask for him is 32 bits set.
>
> Is 32bit DMA limit for every skge device acceptable patch?
No. The device does support 64 bit DMA, the problem is a crap implementation
of the device the motherboard. Therefore a PCI quirk or module parameter
is a better solution.
next prev parent reply other threads:[~2010-09-21 15:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-21 7:15 [RFC] skge: limit DMA to 32 bit Stanislaw Gruszka
2010-09-21 15:02 ` Stephen Hemminger [this message]
2010-09-22 7:34 ` Stanislaw Gruszka
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