netdev - Re: [net-next 2/8] bnx2x: add select queue callback

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Date:	Fri, 10 Dec 2010 14:11:31 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dmitry@...adcom.com
Cc:	netdev@...r.kernel.org, eilong@...adcom.com
Subject: Re: [net-next 2/8] bnx2x: add select queue callback

From: "Dmitry Kravkov" <dmitry@...adcom.com>
Date: Thu, 9 Dec 2010 14:09:16 +0200

> +#endif
> +	/* Select queue (if defined) adjust for fcoe */
> +	fp_index = skb_tx_hash(dev, skb) - FCOE_CONTEXT_USE;
> +
> +	return (fp_index >= 0 ? fp_index : 0);

This doesn't make any sense, and it's one of the reasons I really
hate the fact that drivers sometimes need to override the
select_queue method.

Because 9 times out of 10 they get it wrong.

You're mapping queues 0 --> FCOE_CONTEXT_USE to zero.

But that's not what you actually want.

You're actually trying to make non-FCOE traffic hash only amongst the
non-FCOE queues.

So make your code actually do that instead of screwing up the
distribution of the hash result.
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