igb and ALTQ in 9.1-rc3

[Karim Fodil-Lemelin]

On 11/12/2012 1:03 PM, Adrian Chadd wrote:
> The if_transmit versus multiqueue thing is orthogonal.
Indeed, although ALTQ isn't using if_transmit and doing a simple drop in 
(replacing if_start with if_transmit) breaks ALTQ with multiqueue 
capable drivers.
>
> I'm planning to make net80211 and ath(4) use if_transmit instead of
> if_start. It won't be a multi-queue driver; I'm actually going down
> the path of if_transmit specifically so I can control the TX queue
> serialisation and actively _serialise_ frame TX, instead of
> implementing a multi-queue driver.
>
> ALTQ as a concept needs to be glued in a different way. It can't just
> override the queue macros like it does. That's just plain ew.
I agree. I think ALTQ should maintain its own queues and locks and not 
rely on drivers for queue management.
>
> net80211 has some rather quirky behaviour, unfortunately. I won't go
> into it here. Suffice to say, I can't just use the IFQ macros, the
> if_queue as it stands, nor buf_ring.
>
>
>
> Adrian
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