linux-kernel - Re: [PATCH v3 net-next 01/17] net: dsa: Keep a pointer to the skb clone for TX timestamping

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Date:   Tue, 4 Jun 2019 13:31:59 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>, vivien.didelot@...il.com,
        andrew@...n.ch, davem@...emloft.net, richardcochran@...il.com,
        john.stultz@...aro.org, tglx@...utronix.de, sboyd@...nel.org
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next 01/17] net: dsa: Keep a pointer to the skb
 clone for TX timestamping



On 6/4/2019 10:07 AM, Vladimir Oltean wrote:
> For drivers that use deferred_xmit for PTP frames (such as sja1105),
> there is no need to perform matching between PTP frames and their egress
> timestamps, since the sending process can be serialized.
> 
> In that case, it makes sense to have the pointer to the skb clone that
> DSA made directly in the skb->cb. It will be used for pushing the egress
> timestamp back in the application socket's error queue.
> 
> Signed-off-by: Vladimir Oltean <olteanv@...il.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian