netdev - Re: [RFC][PATCH 1/2] net: support for TX timestamps

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Message-Id: <200807301636.55670.opurdila@ixiacom.com>
Date:	Wed, 30 Jul 2008 16:36:55 +0300
From:	Octavian Purdila <opurdila@...acom.com>
To:	Patrick Ohly <patrick.ohly@...el.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC][PATCH 1/2] net: support for TX timestamps

On Wednesday 30 July 2008, Patrick Ohly wrote:

> > I don't think that skb->sk is guaranteed to be around in hard_start_xmit.
> > But we should not need it, if we overload the skb->tstamp, right?
>
> skb->sk is needed in skb_tx_timestamp() to send the copied skb with the
> time stamp back to the application, isn't it? skb_tx_timestamp() won't
> crash, but it won't be able to do the desired action either. Overloading
> skb->tstamp doesn't help with that.
>

Yes you are right :)

> I don't know where the connection to the originating socket is lost, but
> in linux-2.6 as of one week ago (not 2.6.26, as I said above) the
> skb->sk pointer is indeed NULL for the PTP broadcast packets - I just
> checked again.

Thanks for letting me know, I will look into it.

tavi

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