Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.35 as permitted sender) client-ip=23.128.96.35;
Date:   Mon, 20 Nov 2023 09:37:23 -0800
From:   Jakub Kicinski <kuba@kernel.org>
To:     Vladimir Oltean <vladimir.oltean@nxp.com>
Cc:     =?UTF-8?B?S8O2cnk=?= Maincent <kory.maincent@bootlin.com>,
        Florian Fainelli <florian.fainelli@broadcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@broadcom.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Paolo Abeni <pabeni@redhat.com>,
        Richard Cochran <richardcochran@gmail.com>,
        Radu Pirea <radu-nicolae.pirea@oss.nxp.com>,
        Jay Vosburgh <j.vosburgh@gmail.com>,
        Andy Gospodarek <andy@greyhouse.net>,
        Nicolas Ferre <nicolas.ferre@microchip.com>,
        Claudiu Beznea <claudiu.beznea@tuxon.dev>,
        Willem de Bruijn <willemdebruijn.kernel@gmail.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Horatiu Vultur <horatiu.vultur@microchip.com>,
        UNGLinuxDriver@microchip.com, Simon Horman <horms@kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-doc@vger.kernel.org,
        Maxime Chevallier <maxime.chevallier@bootlin.com>
Subject: Re: [PATCH net-next v7 15/16] net: ethtool: ts: Let the active time
 stamping layer be selectable
Message-ID: <20231120093723.4d88fb2a@kernel.org>
In-Reply-To: <20231120142316.d2emoaqeej2pg4s3@skbuf>
References: <20231114-feature_ptp_netnext-v7-0-472e77951e40@bootlin.com>
        <20231114-feature_ptp_netnext-v7-15-472e77951e40@bootlin.com>
        <20231118183433.30ca1d1a@kernel.org>
        <20231120104439.15bfdd09@kmaincent-XPS-13-7390>
        <20231120105255.cgbart5amkg4efaz@skbuf>
        <20231120121440.3274d44c@kmaincent-XPS-13-7390>
        <20231120120601.ondrhbkqpnaozl2q@skbuf>
        <20231120144929.3375317e@kmaincent-XPS-13-7390>
        <20231120142316.d2emoaqeej2pg4s3@skbuf>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Precedence: bulk

On Mon, 20 Nov 2023 16:23:16 +0200 Vladimir Oltean wrote:
> In previous email discussions, I was proposing to Jakub and you "what if
> we didn't let user space select a specific layer like PHY_TIMESTAMPING
> or MAC_TIMESTAMPING at all, but just select a specific phc_index as the
> provider of hardware timestamps"?

What about my use case of having a NIC which can stamp at a low rate
at the PHY (for PTP) and high rate at the DMA block (for congestion
control)? Both stamp points have the same PHC index.