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Wed, 18 Aug 2021 18:14:13 +0000 From: "Keller, Jacob E" To: Richard Cochran , "Machnikowski, Maciej" CC: "cong.wang@bytedance.com" , "arnd@arndb.de" , "gustavoars@kernel.org" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "colin.king@canonical.com" , "intel-wired-lan@lists.osuosl.org" , "nikolay@nvidia.com" , "linux-kselftest@vger.kernel.org" , "kuba@kernel.org" , "shuah@kernel.org" , "davem@davemloft.net" Subject: RE: [Intel-wired-lan] [RFC net-next 1/7] ptp: Add interface for acquiring DPLL state Thread-Topic: [Intel-wired-lan] [RFC net-next 1/7] ptp: Add interface for acquiring DPLL state Thread-Index: AQHXkrpGZc2YC9udeU2jnSf+yoigt6t2zoSAgACkO4CAAg2XgIAAEo7A Date: Wed, 18 Aug 2021 18:14:13 +0000 Message-ID: References: <20210816160717.31285-1-arkadiusz.kubalewski@intel.com> <20210816160717.31285-2-arkadiusz.kubalewski@intel.com> <20210816235400.GA24680@hoboy.vegasvil.org> <20210818170259.GD9992@hoboy.vegasvil.org> In-Reply-To: <20210818170259.GD9992@hoboy.vegasvil.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-reaction: no-action dlp-version: 11.5.1.3 authentication-results: gmail.com; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CO1PR11MB5089.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4654f27e-5da5-463f-48eb-08d96273fbf5 X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Aug 2021 18:14:13.7154 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Cp9Q0pnSB5SvM3+kttKexG17UP7ViprhPd2PtP8MonF1vwf1dcVJnoCfcbp1P6BlprP7D3HtpDQfuzHrfcunE9NbgpgbkZzXByXnby+/vOU= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR1101MB2078 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org > -----Original Message----- > From: Intel-wired-lan On Behalf Of > Richard Cochran > Sent: Wednesday, August 18, 2021 10:03 AM > To: Machnikowski, Maciej > Cc: cong.wang@bytedance.com; arnd@arndb.de; gustavoars@kernel.org; > netdev@vger.kernel.org; linux-kernel@vger.kernel.org; > colin.king@canonical.com; intel-wired-lan@lists.osuosl.org; nikolay@nvidi= a.com; > linux-kselftest@vger.kernel.org; kuba@kernel.org; shuah@kernel.org; > davem@davemloft.net > Subject: Re: [Intel-wired-lan] [RFC net-next 1/7] ptp: Add interface for = acquiring > DPLL state >=20 > On Tue, Aug 17, 2021 at 09:41:49AM +0000, Machnikowski, Maciej wrote: >=20 > > The logic behind adding the DPLL state to the PTP subsystem is that Syn= cE DPLL > on Network adapters, in most cases, drive the PTP timer. >=20 > So what? The logic in the HW has nothing to do with the proper user > space interfaces. For example, we have SO_TIMESTAMPING and PHC as > separate APIs, even though HW devices often implement both. >=20 > > Having access to it in the PTP subsystem is beneficial, as Telco > > standards, like G.8275.1/2, require a different behavior depending > > on the SyncE availability and state. >=20 > Right, but this does say anything about the API. >=20 > > Multiport adapters use a single PLL to drive all ports. If we add > > the PLL interface to the PTP device - a tool that would implement > > support for Telco standards would have a single source of > > information about the presence and state of physical sync. >=20 > Not really. Nothing guarantees a sane mapping from MAC to PHC. In > many systems, there a many of each. >=20 Well, I think the point of placing it in the PTP subsystem is that there is= a sane mapping between PHC <-> DPLL. There's only one DPLL for the PHC. Thanks, Jake