netdev - Re: Another try at getting pktgen to work with wifi.

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Date:	Fri, 31 May 2013 21:14:15 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Ben Greear <greearb@...delatech.com>
Cc:	Felix Fietkau <nbd@...nwrt.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: Another try at getting pktgen to work with wifi.

On Fri, 2013-05-31 at 11:51 -0700, Ben Greear wrote:

> > What I'm saying though is that I don't see where skb->priority is even
> > _used_ in the wifi stack. I can see it getting set, but not used.
> 
> ieee80211_downgrade_queue
> wme_downgrade_ac // sort of
> ieee80211_select_queue_80211 // sort of...seems twiddling skb->priority is more of a by-product here.
> 
> cfg80211_classify8021d

None of this actually matters, it's all within the select_queue() call
so doesn't need to store it in the skb.

I found it though -- the only thing that ever looks at it is
ieee80211_set_qos_hdr() to set the QoS header TID, and presumably that's
what ath9k complains about (hwsim is happy to just push packets.)

johannes

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