linux-kernel - Re: [PATCH net-next 0/7] Support external snapshots on dwmac1000

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Message-ID: <a905c45d-344b-49e9-a0c9-fb7b6445edad@bootlin.com>
Date: Tue, 29 Oct 2024 15:45:07 +0100
From: Alexis Lothoré <alexis.lothore@...tlin.com>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <joabreu@...opsys.com>, Andrew Lunn <andrew+netdev@...n.ch>,
 davem@...emloft.net, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Richard Cochran <richardcochran@...il.com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/7] Support external snapshots on dwmac1000

Hello Maxime,

On 10/29/24 12:54, Maxime Chevallier wrote:
> Hi,
> 
> This series is another take on the pervious work [1] done by
> Alexis Lothoré, that fixes the support for external snapshots
> timestamping in GMAC3-based devices.
> 

[...]

> [1]: https://lore.kernel.org/netdev/20230616100409.164583-1-alexis.lothore@bootlin.com/
> 
> Thanks Alexis for laying the groundwork for this,
> 
> Best regards,
> 
> Maxime

Thanks for making this topic move forward. I suspect the series to be missing
some bits: in the initial series you mention in [1], I also reworked
stmmac_hwtstamp_set in stmmac_main.c, which is also currently assuming a GMAC4
layout ([2]). I suspect that in your series current state, any new call to
stmmac_hwtstamp_set will overwrite any previously configured hardware timestamping.

[2]
https://lore.kernel.org/netdev/20230616100409.164583-8-alexis.lothore@bootlin.com/
> 
> Maxime Chevallier (7):
>   net: stmmac: Don't modify the global ptp ops directly
>   net: stmmac: Use per-hw ptp clock ops
>   net: stmmac: Only update the auto-discovered PTP clock features
>   net: stmmac: Introduce dwmac1000 ptp_clock_info and operations
>   net: stmmac: Introduce dwmac1000 timestamping operations
>   net: stmmac: Enable timestamping interrupt on dwmac1000
>   net: stmmac: Don't include dwmac4 definitions in stmmac_ptp
> 
>  drivers/net/ethernet/stmicro/stmmac/common.h  |  4 +
>  .../net/ethernet/stmicro/stmmac/dwmac1000.h   | 15 +++-
>  .../ethernet/stmicro/stmmac/dwmac1000_core.c  | 85 +++++++++++++++++++
>  drivers/net/ethernet/stmicro/stmmac/hwif.c    | 14 ++-
>  .../ethernet/stmicro/stmmac/stmmac_hwtstamp.c | 11 +++
>  .../net/ethernet/stmicro/stmmac/stmmac_ptp.c  | 38 +++++++--
>  .../net/ethernet/stmicro/stmmac/stmmac_ptp.h  | 10 +++
>  7 files changed, 165 insertions(+), 12 deletions(-)
> 


-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com