netdev - [PATCH net-2.6] ixgbe/igb: catch invalid VF settings

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Date:	Wed, 21 Jul 2010 12:40:31 -0400
From:	Andy Gospodarek <andy@...yhouse.net>
To:	netdev@...r.kernel.org
Cc:	chrisw@...s-sol.org
Subject: [PATCH net-2.6] ixgbe/igb: catch invalid VF settings

Some ixgbe cards put an invalid VF device ID in the PCIe SR-IOV
capability.  The ixgbe driver is only valid for PFs or non SR-IOV
hardware.  It seems that the same problem could occur on igb hardware as
well, so if we discover we are trying to initialize a VF in ixbge_probe
or igb_probe, print an error and exit.

Based on a patch for ixgbe from Chris Wright <chrisw@...s-sol.org>.

Signed-off-by: Andy Gospodarek <andy@...yhouse.net>
Cc: Chris Wright <chrisw@...s-sol.org>

---
 drivers/net/igb/igb_main.c     |    9 +++++++++
 drivers/net/ixgbe/ixgbe_main.c |    9 +++++++++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 3881918..cea37e0 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -1722,6 +1722,15 @@ static int __devinit igb_probe(struct pci_dev *pdev,
 	u16 eeprom_apme_mask = IGB_EEPROM_APME;
 	u32 part_num;
 
+	/* Catch broken hardware that put the wrong VF device ID in
+	 * the PCIe SR-IOV capability.
+	 */
+	if (pdev->is_virtfn) {
+		WARN(1, KERN_ERR "%s (%hx:%hx) should not be a VF!\n",
+		     pci_name(pdev), pdev->vendor, pdev->device);
+		return -EINVAL;
+	}
+
 	err = pci_enable_device_mem(pdev);
 	if (err)
 		return err;
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 7b5d976..74d9b6d 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -6492,6 +6492,15 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
 #endif
 	u32 part_num, eec;
 
+	/* Catch broken hardware that put the wrong VF device ID in
+	 * the PCIe SR-IOV capability.
+	 */
+	if (pdev->is_virtfn) {
+		WARN(1, KERN_ERR "%s (%hx:%hx) should not be a VF!\n",
+		     pci_name(pdev), pdev->vendor, pdev->device);
+		return -EINVAL;
+	}
+
 	err = pci_enable_device_mem(pdev);
 	if (err)
 		return err;
-- 
1.6.2.5

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