netdev - RE: [PATCH net-next 0/3] net: stmmac: add physical port identification support

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Message-ID:
 <TY6PR01MB173770CE83ECEF70064C078D8FFA6A@TY6PR01MB17377.jpnprd01.prod.outlook.com>
Date: Thu, 4 Dec 2025 17:09:45 +0000
From: John Madieu <john.madieu.xa@...renesas.com>
To: Russell King <linux@...linux.org.uk>
CC: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
	"andrew+netdev@...n.ch" <andrew+netdev@...n.ch>, "davem@...emloft.net"
	<davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>,
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	"robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"geert+renesas@...der.be" <geert+renesas@...der.be>, Biju Das
	<biju.das.jz@...renesas.com>, Claudiu.Beznea <claudiu.beznea@...on.dev>,
	magnus.damm <magnus.damm@...il.com>, "mcoquelin.stm32@...il.com"
	<mcoquelin.stm32@...il.com>, "alexandre.torgue@...s.st.com"
	<alexandre.torgue@...s.st.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-renesas-soc@...r.kernel.org"
	<linux-renesas-soc@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>
Subject: RE: [PATCH net-next 0/3]  net: stmmac: add physical port
 identification support

Hi Russell,

> -----Original Message-----
> From: Russell King <linux@...linux.org.uk>
> Sent: Thursday, December 4, 2025 6:07 PM
> To: John Madieu <john.madieu.xa@...renesas.com>
> Cc: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>;
> andrew+netdev@...n.ch; davem@...emloft.net; edumazet@...gle.com;
> kuba@...nel.org; pabeni@...hat.com; robh@...nel.org; krzk+dt@...nel.org;
> conor+dt@...nel.org; geert+renesas@...der.be; Biju Das
> <biju.das.jz@...renesas.com>; Claudiu.Beznea <claudiu.beznea@...on.dev>;
> magnus.damm <magnus.damm@...il.com>; mcoquelin.stm32@...il.com;
> alexandre.torgue@...s.st.com; netdev@...r.kernel.org; linux-renesas-
> soc@...r.kernel.org; devicetree@...r.kernel.org
> Subject: Re: [PATCH net-next 0/3] net: stmmac: add physical port
> identification support
> 
> See comments on the previous posting of this patch series (why it was
> reposted in as little as six minutes apart...)
> 
> netdev has a rule: allow 24 hours between re-posts.
> 
> netdev has another rule: don't post new material, except for bug fixes for
> the net tree, while netdev is closed (in other words, while the merge
> window is open.) If you wish to post new material, mark it RFC.
> 
> Thanks.
> 

Sorry for duplicated series. Something went wrong while sending out the series.
This won't happen next time.

Regards,
John

> On Thu, Dec 04, 2025 at 04:37:26PM +0000, John Madieu wrote:
> > This series adds physical port identification support to the stmmac
> > driver, enabling userspace to query hardware-stable identifiers for
> > network interfaces via ndo_get_phys_port_id() and
> ndo_get_phys_port_name().
> >
> > On systems with multiple ethernet controllers sharing the same driver,
> > physical port identification provides stable identifiers that persist
> > across reboots and are independent of interface enumeration order.
> > This is particularly useful for predictable network interface naming
> > and for correlating interfaces with physical connectors.
> >
> > The implementation follows a two-tier approach:
> >
> > 1. Generic stmmac support: Default implementations use the permanent MAC
> >    address as port ID and bus_id for port naming. This provides
> immediate
> >    benefit for all stmmac-based platforms.
> >
> > 2. Glue driver override: Platform drivers can provide custom callbacks
> >    for hardware-specific identification schemes. The Renesas GBETH
> driver
> >    implements this to support device tree-based port identification,
> >    addressing cases where hardware lacks unique identification
> registers.
> >
> > The Renesas implementation constructs an 8-byte port identifier from:
> > - Permanent MAC address (if available) or Renesas OUI (74:90:50) as
> > fallback
> > - Port index from device tree property or ethernet alias
> >
> >
> > John Madieu (3):
> >   net: stmmac: add physical port identification support
> >   dt-bindings: net: renesas-gbeth: Add port-id property
> >   net: stmmac: dwmac-renesas-gbeth: add physical port identification
> >
> >  .../bindings/net/renesas,rzv2h-gbeth.yaml     | 19 +++++++
> >  .../stmicro/stmmac/dwmac-renesas-gbeth.c      | 56 +++++++++++++++++++
> >  .../net/ethernet/stmicro/stmmac/stmmac_main.c | 54 ++++++++++++++++++
> >  include/linux/stmmac.h                        |  5 ++
> >  4 files changed, 134 insertions(+)
> >
> > --
> > 2.25.1
> >
> >
> 
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!