linux-kernel - Re: [PATCH net-next] net: lan743x: skip timestamping for non-PTP packets

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Message-ID: <ZMe8To+Rw0/pcjLv@hoboy.vegasvil.org>
Date:   Mon, 31 Jul 2023 06:51:10 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Vishvambar Panth S <vishvambarpanth.s@...rochip.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bryan.whitehead@...rochip.com, UNGLinuxDriver@...rochip.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Subject: Re: [PATCH net-next] net: lan743x: skip timestamping for non-PTP
 packets

On Mon, Jul 31, 2023 at 06:24:18PM +0530, Vishvambar Panth S wrote:
> Currently all the RX packets are timestamped and the timestamp is appended
> to the RX packet for processing, this reduces RX throughput. This can be
> optimized by timestamping packets only when the PTP messages are received.

No, you should not do this unconditionally.

Instead, you need to dial the correct setting based on the
hwtstamp_config in lan743x_ptp_ioctl().

Thanks,
Richard