[PATCH] b43: use rx desc underrun interrupt

["Michael Büsch" <m@bues.ch>]

On Sat, 20 Apr 2013 16:14:09 +0200 (CEST)
Thommy <thommyj@gmail.com> wrote:

> +void b43_dma_rx_discard(struct b43_dmaring *ring)
> +{
> +	B43_WARN_ON(ring->tx);
> +
> +	/* Device has filled all buffers, drop all packets in buffers
> +	* and let TCP decrease speed.
> +	* Set index to one desc after the last one
> +	* so the device will see all slots as free again
> +	*/
> +	/*
> +	*TODO: How to increase rx_drop in mac80211?
> +	*/
> +	b43_dma_write(ring, B43_DMA32_RXINDEX, ring->nr_slots *
> +			sizeof(struct b43_dmadesc32));
> +}

You need to check whether this is a 32bit or 64bit DMA engine and
write to B43_DMA32_RXINDEX or B43_DMA64_RXINDEX.
You could simply use the ring->ops->set_current_rxslot() dmaop for that.

And I think you need to set ring->current_slot to the value of ring->ops->get_current_slot().
Not 100% sure, though, since it is years since I worked on that code.

-- 
Michael
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