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 43F3923908B for ; Fri, 25 Jul 2025 09:50:29 +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=1753437031; cv=none; b=dRN5dQvt/AjXhRP5ev+mlwboN6H5wC/yRAXNuLk8pMfZtdbZwG8nJhGF/v2GrHnKrVwb58AIIw5WlUGoKJWA1WTb96FRGxJp9ORkTJYS5KKtxKO8yxGN+w+yT6V6Sc/Qv+ic0fKJ46PP7ngs5e3fTwUMELV1PMDyIaz+RQXdDG0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753437031; c=relaxed/simple; bh=Zl9TzDD48HcoHQ99zKFTudm8OLh/D7DbHes5R0YJkP0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=DO/rEVsnvKTq2uy79/S9kIjH81xS7e6BQE1t/yMTctoXZQB4hWoFU9KNfLqX14tjqy9BpIH27xPc1IEt8c1tfs0FkeCql2VqCGUtfG+xwclTWlHy3a8Mv7rtTLDwJW0k+Drtd0XZ5ro5Z5ZooBHI0cZNg2/KeHDDqdHpdN0MhcA= 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=LB4teSJl; 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="LB4teSJl" 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=Zl9TzDD48HcoHQ99zKFTudm8OLh/D7DbHes5R0YJkP0=; b=LB4teSJl+dzqvR30vNhUaEzk9D pXa9laHziPAHC7PQIYxKcZREIEwwg9tV3fsucWyVBFTcQKjzohsNsY3mnsrQTn0imeVa2tJ94iRuT Y+ZxP1+mIpT64OJr+uY+AghckHbPg6iiH++0hpJ+oO6fGZQSjybPT5WkEfbJTDKquVWX2XF4xGvuV Crw19lFbkF8THOo/RocbfQQK25TYMbE29542Dkj4UU/knyLwPkmSDnmJVubnguMuPSa9JMHcqTeYo bnzSZxqJS2WfmK2lr/FT6JU2r1xnVQ2GdsQTysMf2BKDM2iJu0f+D59z7RKYK+WveGSgoBvo/tsw/ HfqZ5X+g==; Received: from [54.239.6.186] (helo=freeip.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1ufEgA-000000093C5-0uby; Fri, 25 Jul 2025 09:25:27 +0000 Message-ID: <3f722a52642dc42ad8d5e23ab06c14050d7bf8a6.camel@infradead.org> Subject: Re: [RFC PATCH net-next] ptp: Introduce PTP_SYS_OFFSET_EXTENDED_TRUSTED ioctl From: David Woodhouse To: Richard Cochran , David Arinzon Cc: David Miller , Jakub Kicinski , Eric Dumazet , Paolo Abeni , "Woodhouse, David" , Andrew Lunn , Miroslav Lichvar , Thomas Gleixner , netdev@vger.kernel.org, "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: Fri, 25 Jul 2025 11:25:24 +0200 In-Reply-To: References: <20250724115657.150-1-darinzon@amazon.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-iAdCS9kNBtyTqxvy6puQ" 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 --=-iAdCS9kNBtyTqxvy6puQ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2025-07-24 at 21:09 -0700, Richard Cochran wrote: > On Thu, Jul 24, 2025 at 02:56:56PM +0300, David Arinzon wrote: >=20 > > The first objective focuses on the use case where the PHC device > > is fully managed. The ENA driver, for example, exposes a PHC > > device, whose synchronization status and quality is maintained > > without any user-space application. This new ioctl reports on the > > clock accuracy and status of the PHC device to user-space > > applications, where ptp4l and similar are not available. >=20 > This seems pretty rare.=C2=A0 I can't think of any other hardware that > makes claims about synchronization quality. >=20 > So this ioctl would be just for one device. The vmclock enlightenment also exposes the same information. David, your RFC should probably have included that implementation shouldn't it?=20 --=-iAdCS9kNBtyTqxvy6puQ 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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