netdev - Re: [PATCH 01/19] netdev: change transmit to limited range type

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Date:	Tue, 01 Sep 2009 01:18:10 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	shemminger@...tta.com, netdev@...r.kernel.org
Subject: Re: [PATCH 01/19] netdev: change transmit to limited range type

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 01 Sep 2009 09:39:47 +0200

> I was wondering if we could add a third parameter to 
> ndo_start_xmit() (and pass the struct netdev_queue *txq)
> in a smooth way, but could not find a solution.

Don't think that others didn't think about this too :-)

> Unconverted drivers would not care of this third param; but this
> should be provided by callers (like dev_hard_start_xmit())
>
> Most multiqueue drivers have to recompute it, and even monoqueue drivers
> have to call netif_stop_queue(dev)/netif_queue_stopped(dev), all
> using netdev_get_tx_queue(dev, 0) in the end...

At least that is a constant structure offset reference, and thus
computed at compile time.

Anyways, I like Stephen's netdev_tx_t changes and I'm build testing
them now in my net-next-2.6
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