netdev - Re: [PATCH net-next] net: mscc: ocelot: always pass skb clone to ocelot_port_add_txtstamp

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Date:   Wed, 23 Sep 2020 19:18:17 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, yangbo.lu@....com,
        xiaoliang.yang_1@....com, UNGLinuxDriver@...rochip.com,
        claudiu.manoil@....com, alexandre.belloni@...tlin.com,
        andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        kuba@...nel.org
Subject: Re: [PATCH net-next] net: mscc: ocelot: always pass skb clone to
 ocelot_port_add_txtstamp_skb

On Wed, Sep 23, 2020 at 02:24:20PM +0300, Vladimir Oltean wrote:
> Currently, ocelot switchdev passes the skb directly to the function that
> enqueues it to the list of skb's awaiting a TX timestamp. Whereas the
> felix DSA driver first clones the skb, then passes the clone to this
> queue.
> 
> This matters because in the case of felix, the common IRQ handler, which
> is ocelot_get_txtstamp(), currently clones the clone, and frees the
> original clone. This is useless and can be simplified by using
> skb_complete_tx_timestamp() instead of skb_tstamp_tx().
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

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