netdev - Re: [PATCH RFC net-next] net: phy: add Marvell PHY PTP support [multicast/DSA issues]

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Date:   Mon, 27 Feb 2023 15:40:37 +0100
From:   Köry Maincent <kory.maincent@...tlin.com>
To:     linux@...linux.org.uk
Cc:     andrew@...n.ch, davem@...emloft.net, f.fainelli@...il.com,
        hkallweit1@...il.com, kuba@...nel.org, netdev@...r.kernel.org,
        richardcochran@...il.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>
Subject: Re: [PATCH RFC net-next] net: phy: add Marvell PHY PTP support
 [multicast/DSA issues]

Hello RMK,

> Hence why I'm at the point of giving up; I don't see that PTP will be
> of very limited benefit on my network with all these issues, and in
> any case, NTP has been "good enough" for the last 20+ years.  Given
> that only a limited number of machines will be able to implement PTP
> support anyway, NTP will have to run along side it.

I see this patch has been abandoned.
I am testing it with a ZynqMP board (macb ethernet) and it seems to more or
less work. It got tx timestamp timeout at initialization but after some times
(~20 seconds) ptp4l manages to set it working. Also the IEEE 802.3
network PTP mode is not working, it constantly throw rx timestamp overrun
errors.
I will aim at fixing these issues and adding support to interrupts. It would be
good to have it accepted mainline. What do you think is missing for that? I see
you faced issues with few Armada SOM and IP_MULTICAST, is it still the case?

I am new to the PTP and Ethernet APIs I will try to not speak nonsense but
please correct me if I do.

Köry