linux-kernel - Re: [Patch net-next v3 08/13] net: dsa: microchip: ptp: add packet transmission timestamping

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Message-ID: <20221209150739.bddwnli5ddaxmws5@skbuf>
Date:   Fri, 9 Dec 2022 17:07:39 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Arun Ramadoss <arun.ramadoss@...rochip.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux@...linux.org.uk,
        Tristram.Ha@...rochip.com, richardcochran@...il.com,
        ceggers@...i.de
Subject: Re: [Patch net-next v3 08/13] net: dsa: microchip: ptp: add packet
 transmission timestamping

On Fri, Dec 09, 2022 at 12:54:32PM +0530, Arun Ramadoss wrote:
> From: Christian Eggers <ceggers@...i.de>
> 
> This patch adds the routines for transmission of ptp packets. When the
> ptp pdelay_req packet to be transmitted, it uses the deferred xmit
> worker to schedule the packets.
> During irq_setup, interrupt for Sync, Pdelay_req and Pdelay_rsp are
> enabled. So interrupt is triggered for all three packets. But for
> p2p1step, we require only time stamp of Pdelay_req packet. Hence to
> avoid posting of the completion from ISR routine for Sync and
> Pdelay_resp packets, ts_en flag is introduced. This controls which
> packets need to processed for timestamp.
> After the packet is transmitted, ISR is triggered. The time at which
> packet transmitted is recorded to separate register.
> This value is reconstructed to absolute time and posted to the user
> application through socket error queue.
> 
> Signed-off-by: Christian Eggers <ceggers@...i.de>
> Co-developed-by: Arun Ramadoss <arun.ramadoss@...rochip.com>
> Signed-off-by: Arun Ramadoss <arun.ramadoss@...rochip.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>