Re: [RFC] mac80211: move TX status processing to process context

["Luis R. Rodriguez" <lrodriguez@atheros.com>]

On Wed, Nov 18, 2009 at 01:06:54PM -0800, Luis Rodriguez wrote:
> 
> OK, but can't you still have a driver spam mac80211 with a lot of
> ieee80211_tx_status_irqsafe() calls in soft irq context with the final
> skb requiring the tx complete, in that case the queue *will* get stuffed
> and you could potentially free more if so desired.
> 
> Also, if our goal is to just avoid adding the skb if it does not require
> a tx complete and our queue size is too large

Hit send too early, I meant if our goal is to avoid adding the skb
if we've reached our limit why not just ree it immediately instead
of queing it and dequeing it. Wouldn't we even be able to just
return and not bother mac80211 about it at all?

> 
>         if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS) &&
>             num + 1 > IEEE80211_TX_STATUS_QUEUE_LIMIT)
		{
>                 dev_kfree_skb_irq(skb);
		return;
	}
>         else
>                 skb_queue_tail(&local->skb_queue)