netdev - Re: [PATCH 1/1] net: hold sock reference while processing tx timestamps

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Message-ID: <1318496083.5612.1.camel@jlt3.sipsolutions.net>
Date:	Thu, 13 Oct 2011 10:54:43 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH 1/1] net: hold sock reference while processing tx
 timestamps

On Wed, 2011-10-12 at 21:52 +0200, Eric Dumazet wrote:

> > The other thing I was wondering -- what if we just set truesize to 1 (we
> > don't have any truesize checks) and account the skb to the socket
> > normally. Not really a good way either though.
> > 
> 
> Changing truesize is not allowed here see below.

Oh, good point.

> > FWIW I just decided to do it the other way around in mac80211 -- keep
> > the original SKB that's charged to the socket for the error queue, and
> > use a clone to actually do the TX.
> 
> Hmm, please take a look at IFF_SKB_TX_SHARING stuff, added in commit
> d88733150 (net: add IFF_SKB_TX_SHARED flag to priv_flags)

mac80211 got that flag cleared -- and right now I see no way to change
that. 11ac/ad may require work in this area to be able to do this
better, and I have a number of ideas on how to do that, but right now I
don't see how we can do that.

johannes

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