Patchwork pci: Added quirk to disable msi for MCP55 NIC on Asus P5N32-SLI Premium

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Submitter Andreas Petlund
Date Nov. 14, 2008, 10:02 a.m.
Message ID <>
Download mbox | patch
Permalink /patch/8751/
State Changes Requested
Delegated to: Jeff Garzik
Headers show


Andreas Petlund - Nov. 14, 2008, 10:02 a.m.
Andreas Petlund wrote:
> I have a machine with an Asus motherboard (P5N32-SLI Premium - NVidia 
> MCP55 chipset) where the forcedeth module does not work with msi. This 
> seems to bother quite some people ( see 
> ).
> Reading various forum posts makes me inclined to believe this is a 
> firmware problem, but Asus have no fix with their latest BIOS-upgrade 
> (and I am starting to believe that we will never see one as the last 
> update came in March this year).
> Is it an option to workaround this problem using a hardware-specific 
> quirk that disables msi/msix for the device, or will that affect a lot 
> of users that have no issues with this? On my system the NIC 
> identifies as "cb84". I don't know if this is a common factor for all 
> who has this problem, or only for my motherboard.
> Maybe the benefit of making it work with all MCP55-NICs is worth 
> disabling msi/msix also for unaffected ones?
> Does anybody have alternative suggestions?
This patch detects the known affected motherboard and disables msi for 
the MCP55 NIC devices, allowing normal netwrk operation without manually 
having to reload forcedeth module with msi=0 and msix=0.

Signed-off-by: Andreas Petlund <>
 drivers/pci/quirks.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

        struct pci_dev *host_bridge;
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diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 5049a47..1bbd912 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
+/* The P5N32-SLI Premium motherboard from Asus has a problem with msi
+ * for the MCP55 NIC. It is not yet determined whether the msi problem
+ * also affects other devices. As for now, turn off msi for this device.
+ */
+static void __devinit nvenet_msi_disable(struct pci_dev *dev)
+       if (dmi_name_in_vendors("P5N32-SLI PREMIUM")) {
+               dev_info(&dev->dev,
+                        "Disabling msi for MCP55 NIC on P5N32-SLI 
+               dev->no_msi = 1;
+       }
+                       PCI_DEVICE_ID_NVIDIA_NVENET_15,
+                       nvenet_msi_disable);
 static void __devinit nv_msi_ht_cap_quirk(struct pci_dev *dev)