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

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Date:   Tue, 20 Apr 2021 07:39:40 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     Richard Cochran <richardcochran@...il.com>,
        Vladimir Oltean <olteanv@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Vladimir Oltean <vladimir.oltean@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        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" <UNGLinuxDriver@...rochip.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [net-next 1/3] net: dsa: optimize tx timestamp request handling

> -----Original Message-----
> From: Richard Cochran <richardcochran@...il.com>
> Sent: 2021年4月18日 23:11
> To: Vladimir Oltean <olteanv@...il.com>
> Cc: Y.b. Lu <yangbo.lu@....com>; netdev@...r.kernel.org; Vladimir Oltean
> <vladimir.oltean@....com>; David S . Miller <davem@...emloft.net>; Jakub
> Kicinski <kuba@...nel.org>; Jonathan Corbet <corbet@....net>; Kurt
> Kanzenbach <kurt@...utronix.de>; 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 Sun, Apr 18, 2021 at 12:18:42PM +0300, Vladimir Oltean wrote:
> >
> > How about not passing "clone" back to DSA as an argument by reference,
> > but instead require the driver to populate DSA_SKB_CB(skb)->clone if
> > it needs to do so?
> >
> > Also, how about changing the return type to void? Returning true or
> > false makes no difference.

Thank you. That's good idea.
And how about letting driver store the skb clone pointer, or not? I copied my comments in patch #3 here,

" Can we totally drop dsa_skb_cb in dsa core? The only usage of it is holding a skb clone pointer, for only felix and sja1105.
Actually we can move such pointer in <device>_skb_cb, instead of reserving the space of skb for any drivers."

> 
> +1
> 
> Thanks,
> Richard