netdev - RE: bug fix for out-of-tree igb driver

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Date:	Wed, 4 May 2011 11:36:03 -0700
From:	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>
To:	Ben Greear <greearb@...delatech.com>,
	netdev <netdev@...r.kernel.org>
Subject: RE: bug fix for out-of-tree igb driver



>-----Original Message-----
>From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
>On Behalf Of Ben Greear
>Sent: Wednesday, May 04, 2011 11:06 AM
>To: netdev
>Subject: bug fix for out-of-tree igb driver
>
>Just in case someone is using the out-of-tree igb driver, I
>think I found a bug.
>
>The tx_queue_mapping method should have r_idx >= adapter->num_tx_queues
>as shown below.  The driver had: r_idx > adapter->num_tx_queues
>originally.
>
>Its possible my code is buggy for sending queue_mapping of 1
>when num_tx_queues is 1, but either way, the driver
>shouldn't crash.
>
>Upstream igb driver in mainline kernels does not have this problem.
>
>static inline struct igb_ring *igb_tx_queue_mapping(struct igb_adapter
>*adapter,
>                                                     struct sk_buff
>*skb)
>{
>	unsigned int r_idx = skb->queue_mapping & (IGB_MAX_TX_QUEUES - 1);
>
>	if (r_idx >= adapter->num_tx_queues)
>		r_idx = r_idx % adapter->num_tx_queues;
>
>	return adapter->tx_ring[r_idx];
>}
>
>Thanks,
>Ben
>
>--
>Ben Greear <greearb@...delatech.com>
>Candela Technologies Inc  http://www.candelatech.com
>
>--
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Thanks Ben,

I'll be fixing that ASAP and updating the driver version there.

Carolyn

Carolyn Wyborny
Linux Development
LAN Access Division
Intel Corporation



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