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

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Message-ID: <SN6PR11MB3341B905C5D5705205A4D839EC08A@SN6PR11MB3341.namprd11.prod.outlook.com>
Date:   Thu, 3 Aug 2023 03:39:34 +0000
From:   <VishvambarPanth.S@...rochip.com>
To:     <richardcochran@...il.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

Hi Richard,

Thanks for your review comments. 
We will work on configuring timestamp based on hwtstamp_config. We will update in the next patch submission. 

Thanks,
Vishvambar Panth S

-----Original Message-----
From: Richard Cochran <richardcochran@...il.com> 
Sent: Monday, July 31, 2023 7:21 PM
To: VishvambarPanth S - I69108 <VishvambarPanth.S@...rochip.com>
Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Bryan Whitehead - C21958 <Bryan.Whitehead@...rochip.com>; UNGLinuxDriver <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

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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