From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6A0934685 for ; Thu, 24 Jul 2025 14:08:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753366137; cv=none; b=RJ92N8IootdYjUXhRDugsTMzhi69A+nMbBAVDqxfpPWHddYpEKy/h7MzBZ7r0A0TDGrSnMskRSONel6IKMhzUSsITJkf6yc3IpThd5K/PEeSg7qXUuOyA2gYcccwko76WpR2BS7nLqs2cHF7OJ1wjAXwDhM+RZBQL2EKF8q4ow0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753366137; c=relaxed/simple; bh=Do8VvXsSg+c6rrnB5MRPREKadU2qBOUTtpm79HEF72M=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=u4rZD+//jvS9co7J/dJrcyL4N5awaBz9P3n72xp5drvz9f8rE9YDQ53P4vuaT1FDn4EWyWJjCXTtNTnzCeQw7LWWueq22HI844nBkxDQVjAW1aALTBEXogTtQzukPTzxlS6NldPOQEIffyFUCCME8KCW55pq5O7HYITrm5404Tg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=PlNlakk7; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="PlNlakk7" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Do8VvXsSg+c6rrnB5MRPREKadU2qBOUTtpm79HEF72M=; b=PlNlakk7EI9WIfzmfjIjjucWjO pxmb/46f7s9XFYmkX4W+36WI2MapYElWw7VgIKiBL5ktspLBErYUUAkv0tIPIdVWESn73CoyLVRkR juTZwkVr4d2/hOp5EC1VYXo9NPbGoZ4gZbLyuQCiOFlgUvd/JowOPfJG7hzjv+lLUqcnoEOVRayM3 wfiSxLNTFnxze3BcyE9DNg7uGhLiylnA4HVMUL1wM3vnjjvznghOUIoCsceRUX96fXJJy5PEjvePt 05tbPrnOTzAeK/4LjCMyxIxUsnItZHPOl0xciD9sslq3X7nNHjUT7Q2NMXEtk3N1bJ3GzQe1pRzjB f1xBIMjA==; Received: from [54.239.6.185] (helo=freeip.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1uewcq-0000000E75t-3Eco; Thu, 24 Jul 2025 14:08:49 +0000 Message-ID: <098c86747dfa8e8a917d2b029ccc89dd8023b25d.camel@infradead.org> Subject: Re: [RFC PATCH net-next] ptp: Introduce PTP_SYS_OFFSET_EXTENDED_TRUSTED ioctl From: David Woodhouse To: David Arinzon , David Miller , Jakub Kicinski , Richard Cochran , Eric Dumazet , Paolo Abeni , "Woodhouse, David" , Andrew Lunn , Miroslav Lichvar , Thomas Gleixner , netdev@vger.kernel.org Cc: "Machulsky, Zorik" , "Matushevsky, Alexander" , Saeed Bshara , "Wilson, Matt" , "Liguori, Anthony" , "Bshara, Nafea" , "Schmeilin, Evgeny" , "Belgazal, Netanel" , "Saidi, Ali" , "Herrenschmidt, Benjamin" , "Kiyanovski, Arthur" , "Dagan, Noam" , "Bernstein, Amit" , "Ostrovsky, Evgeny" , "Tabachnik, Ofir" , Julien Ridoux , Josh Levinson Date: Thu, 24 Jul 2025 16:08:46 +0200 In-Reply-To: <20250724115657.150-1-darinzon@amazon.com> References: <20250724115657.150-1-darinzon@amazon.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-xUuq2Xs/YXKuWU6s9++8" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-xUuq2Xs/YXKuWU6s9++8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2025-07-24 at 14:56 +0300, David Arinzon wrote: >=20 > The proposed PTP_SYS_OFFSET_EXTENDED_TRUSTED ioctl fulfills both > objectives by extending each PHC timestamp with two quality > indicators: >=20 > - error_bound: a device-calculated value (in nanoseconds) > =C2=A0 reflecting the maximum possible deviation of the timestamp from > =C2=A0 the true time, based on internal clock state. >=20 > - clock_status: a qualitative state of the clock, with defined > =C2=A0 values including: > =C2=A0 1. Unknown: the clock's synchronization status cannot be > =C2=A0=C2=A0=C2=A0=C2=A0 reliably determined. > =C2=A0 2. Initializing: the clock is acquiring synchronization. > =C2=A0 3. Synchronized: The clock is actively being synchronized and > =C2=A0=C2=A0=C2=A0=C2=A0 maintained accurately by the device. > =C2=A0 4. FreeRunning: the clock is drifting and not being > =C2=A0=C2=A0=C2=A0=C2=A0 synchronized and updated by the device. > =C2=A0 5. Unreliable: the clock is known to be unreliable, the > =C2=A0=C2=A0=C2=A0=C2=A0 error_bound value cannot be trusted. Should this also include a 'type' field matching vmclock & virtio-rtc? Especially if it's a smeared type, that is a (contra-)indication of the quality of the clock. Julien, I assume you're happy that this is *maxerror* and we completely ignore esterror which should never exist anyway? --=-xUuq2Xs/YXKuWU6s9++8 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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