netdev - Re: [PATCH net-next v4 5/6] net: mvpp2: ptp: add support for receive timestamping

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Date:   Wed, 9 Sep 2020 11:11:41 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Russell King <rmk+kernel@...linux.org.uk>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Matteo Croce <mcroce@...hat.com>,
        Andre Przywara <andre.przywara@....com>,
        Sven Auhagen <sven.auhagen@...eatech.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 5/6] net: mvpp2: ptp: add support for receive
 timestamping

On Wed, Sep 09, 2020 at 05:25:55PM +0100, Russell King wrote:
> Add support for receive timestamping. When enabled, the hardware adds
> a timestamp into the receive queue descriptor for all received packets
> with no filtering. Hence, we can only support NONE or ALL receive
> filter modes.
> 
> The timestamp in the receive queue contains two bit sof seconds and
> the full nanosecond timestamp. This has to be merged with the remainder
> of the seconds from the TAI clock to arrive at a full timestamp before
> we can convert it to a ktime for the skb hardware timestamp field.
> 
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>

Acked-by: Richard Cochran <richardcochran@...il.com>