netdev - [PATCH 4/6] ixgbe: warn when device is in a x4 or lower width slot

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Message-ID: <20080211172556.29090.23204.stgit@localhost.localdomain>
Date:	Mon, 11 Feb 2008 09:25:56 -0800
From:	Auke Kok <auke-jan.h.kok@...el.com>
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net
Subject: [PATCH 4/6] ixgbe: warn when device is in a x4 or lower width slot

It's easy to oversee this issue when working with this card
as evrything will work OK but performance is severely limited
(something like 1.5gbit on a x1 link) if the pci-express
slot does not offer more bandwidth.

Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
---

 drivers/net/ixgbe/ixgbe_main.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index ead49e5..576fb51 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -2778,6 +2778,14 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
 		 hw->mac.type, hw->phy.type,
 		 (part_num >> 8), (part_num & 0xff));
 
+	if (link_width <= IXGBE_PCI_LINK_WIDTH_4) {
+		dev_warn(&pdev->dev, "PCI-Express bandwidth available for "
+			 "this card is not sufficient for optimal "
+			 "performance.\n");
+		dev_warn(&pdev->dev, "For optimal performance a x8 "
+			 "PCI-Express slot is required.\n");
+	}
+
 	/* reset the hardware with the new settings */
 	ixgbe_start_hw(hw);
 

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