netdev - Re: [PATCH v2 net-next] dp83640: Fix receive timestamp race condition

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Date:	Tue, 22 Jul 2014 19:57:20 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	stefan.sorensen@...ctralink.com
Cc:	richardcochran@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next] dp83640: Fix receive timestamp race
 condition

From: Stefan Sørensen <stefan.sorensen@...ctralink.com>
Date: Tue, 22 Jul 2014 15:20:45 +0200

> When timestamping received packets, rx_timestamp_work may be scheduled
> before the timestamps is received from the hardware resulting in the
> packet beeing delivered without the timestamp.
> 
> This is fixed by changing the receive timestamp path:
> 
> On receiving a packet that need timestamping, the rxts list is
> traversed.  If a match is found, packet+timestamp are delivered,
> otherwise the packet is added to a rx_queue.
> 
> When a timestamp arrives rx_queue is traversed and if a matching
> packet is found, it is delivered with the timestamp. Otherwise the
> timestamp is added to the rxts list for matching with packets arriving
> later.
> 
> In case the hardware drops a timestamp, a workqueue regularly checks
> the queue for old packets and delivers them without a timestamp.
> 
> Signed-off-by: Stefan Sørensen <stefan.sorensen@...ctralink.com>

Applied.
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