netdev - Re: [net-next 1/3] net: dsa: optimize tx timestamp request handling

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Date:   Mon, 19 Apr 2021 08:46:33 +0200
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Yangbo Lu <yangbo.lu@....com>, netdev@...r.kernel.org
Cc:     Yangbo Lu <yangbo.lu@....com>,
        Richard Cochran <richardcochran@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [net-next 1/3] net: dsa: optimize tx timestamp request handling

On Fri Apr 16 2021, Yangbo Lu wrote:
> Optimization could be done on dsa_skb_tx_timestamp(), and dsa device
> drivers should adapt to it.
>
> - Check SKBTX_HW_TSTAMP request flag at the very beginning, instead of in
>   port_txtstamp, so that most skbs not requiring tx timestamp just return.
>
> - No longer to identify PTP packets, and limit tx timestamping only for PTP
>   packets. If device driver likes, let device driver do.
>
> - It is a waste to clone skb directly in dsa_skb_tx_timestamp().
>   For one-step timestamping, a clone is not needed. For any failure of
>   port_txtstamp (this may usually happen), the skb clone has to be freed.
>   So put skb cloning into port_txtstamp where it really needs.
>
> Signed-off-by: Yangbo Lu <yangbo.lu@....com>

PTP still works.

Tested-by: Kurt Kanzenbach <kurt@...utronix.de> # hellcreek

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