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Date: Tue, 19 May 2026 16:33:51 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Arthur Kiyanovski <akiyano@amazon.com>
Cc: David Miller <davem@davemloft.net>, <netdev@vger.kernel.org>, Richard
 Cochran <richardcochran@gmail.com>, Eric Dumazet <edumazet@google.com>,
 Paolo Abeni <pabeni@redhat.com>, David Woodhouse <dwmw2@infradead.org>,
 Thomas Gleixner <tglx@linutronix.de>, Miroslav Lichvar
 <mlichvar@redhat.com>, Andrew Lunn <andrew+netdev@lunn.ch>, Wen Gu
 <guwen@linux.alibaba.com>, Xuan Zhuo <xuanzhuo@linux.alibaba.com>, David
 Woodhouse <dwmw@amazon.com>, "Yonatan Sarna" <ysarna@amazon.com>, Zorik
 Machulsky <zorik@amazon.com>, "Alexander Matushevsky" <matua@amazon.com>,
 Saeed Bshara <saeedb@amazon.com>, Matt Wilson <msw@amazon.com>, Anthony
 Liguori <aliguori@amazon.com>, Nafea Bshara <nafea@amazon.com>, Evgeny
 Schmeilin <evgenys@amazon.com>, Netanel Belgazal <netanel@amazon.com>, Ali
 Saidi <alisaidi@amazon.com>, Benjamin Herrenschmidt <benh@amazon.com>, Noam
 Dagan <ndagan@amazon.com>, David Arinzon <darinzon@amazon.com>, Evgeny
 Ostrovsky <evostrov@amazon.com>, Ofir Tabachnik <ofirt@amazon.com>, Amit
 Bernstein <amitbern@amazon.com>, <linux-kselftest@vger.kernel.org>,
 <shuah@kernel.org>, <vadim.fedorenko@linux.dev>
Subject: Re: [PATCH v3 net-next 0/7] ptp: Add PHC timestamp quality
 attributes
Message-ID: <20260519163351.61b746d0@kernel.org>
In-Reply-To: <177921463623.22936.15326822041328476600.b4-reply@b4>
References: <20260515164033.6403-1-akiyano@amazon.com>
	<20260518182646.2d1337d4@kernel.org>
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On Tue, 19 May 2026 18:17:16 +0000 Arthur Kiyanovski wrote:
> On 2026-05-18 18:26:46-07:00, Jakub Kicinski wrote:
> > On Fri, 15 May 2026 16:40:20 +0000 Arthur Kiyanovski wrote:
> >  =20
> > > This series adds quality attributes to PTP Hardware Clock (PHC)
> > > timestamps, allowing userspace to obtain error bound, clock status,
> > > timescale, and raw counter values alongside timestamps in a single
> > > call. =20
> >=20
> > How does this proposal relate to:
> >=20
> > https://lore.kernel.org/all/20260517220326.4625-9-dwmw2@infradead.org/
> >=20
> > ? =20
> The two series are independent and complementary. This patchset adds a
> generic PTP subsystem interface for reporting quality attributes (error
> bounds, clock status) alongside PHC timestamps =E2=80=94 it's a userspace=
-facing
> API extension. The RFC is about kernel-internal feed-forward clock
> discipline, letting the timekeeping subsystem lock directly to a vmclock
> reference.
>=20
> Both touch ptp_vmclock.c but in different code paths: this series adds a
> gettimexattrs64 callback for PTP chardev ioctls, the RFC adds
> timekeeping_set_reference() for kernel-internal clock steering. No
> functional dependency or overlap.

I suspect David will agree, but it'd nonetheless be good to see his
review tag on these patches.