netdev - ixgbe: [RFC] [PATCH] Fix return of invalid txq

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Message-Id: <20100115053117.31513.82775.sendpatchset@krkumar2.in.ibm.com>
Date:	Fri, 15 Jan 2010 11:01:17 +0530
From:	Krishna Kumar <krkumar2@...ibm.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, jeffrey.t.kirsher@...el.com,
	Krishna Kumar <krkumar2@...ibm.com>
Subject: ixgbe: [RFC] [PATCH] Fix return of invalid txq

A developer had complained of getting lots of warnings:

"eth16 selects TX queue 98, but real number of TX queues is 64"

http://www.mail-archive.com/e1000-devel@lists.sourceforge.net/msg02200.html

As there was no follow up on that bug, I am submitting this
patch assuming that the other return points will not return
invalid txq's, and also that this fixes the bug (not tested).

Signed-off-by: Krishna Kumar <krkumar2@...ibm.com>
---
 drivers/net/ixgbe/ixgbe_main.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff -ruNp org/drivers/net/ixgbe/ixgbe_main.c new/drivers/net/ixgbe/ixgbe_main.c
--- org/drivers/net/ixgbe/ixgbe_main.c	2010-01-12 11:50:24.000000000 +0530
+++ new/drivers/net/ixgbe/ixgbe_main.c	2010-01-12 11:50:44.000000000 +0530
@@ -5514,8 +5514,11 @@ static u16 ixgbe_select_queue(struct net
 	struct ixgbe_adapter *adapter = netdev_priv(dev);
 	int txq = smp_processor_id();
 
-	if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE)
+	if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) {
+		while (unlikely(txq >= dev->real_num_tx_queues))
+			txq -= dev->real_num_tx_queues;
 		return txq;
+	}
 
 #ifdef IXGBE_FCOE
 	if ((adapter->flags & IXGBE_FLAG_FCOE_ENABLED) &&
--
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