netdev - Re: [PATCH RFC net-next] net: phylink: always config mac for (delayed) phy

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Message-ID: <Z30iUj6DE9-fRp0n@shell.armlinux.org.uk>
Date: Tue, 7 Jan 2025 12:47:14 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Eric Woudstra <ericwouds@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Frank Wunderlich <frank-w@...lic-files.de>,
	Daniel Golle <daniel@...rotopia.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, bridge@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH RFC net-next] net: phylink: always config mac for
 (delayed) phy

Going through the log...

On Tue, Jan 07, 2025 at 01:36:15PM +0100, Eric Woudstra wrote:
> Log before this patch is applied:
> [root@...r3 ~]# dmesg | grep eth1
> [    2.515179] mtk_soc_eth 15100000.ethernet eth1: mediatek frame engine at 0xffff800082380000, irq 123
> [   38.271431] mtk_soc_eth 15100000.ethernet eth1: configuring for inband/2500base-x link mode
> [   38.279828] mtk_soc_eth 15100000.ethernet eth1: major config, requested inband/2500base-x
> [   38.288009] mtk_soc_eth 15100000.ethernet eth1: interface 2500base-x inband modes: pcs=01 phy=00
> [   38.296800] mtk_soc_eth 15100000.ethernet eth1: major config, active inband/inband,an-disabled/2500base-x

This is indeed without the PHY. We're using inband, although the PCS
mode is PHYLINK_PCS_NEG_INBAND_DISABLED, meaning inband won't be
used. As there is no PHY, we can't switch to MLO_AN_PHY.

> [   38.306362] mtk_soc_eth 15100000.ethernet eth1: phylink_mac_config: mode=inband/2500base-x/none adv=00,00000000,00008000,0000e240 pause=04
> [   39.220149] mtk_soc_eth 15100000.ethernet eth1:  interface 2 (mii) rate match none supports 0-3,6-7,13-14
> [   39.229758] mtk_soc_eth 15100000.ethernet eth1:  interface 3 (gmii) rate match none supports 0-3,5-7,13-14
> [   39.239420] mtk_soc_eth 15100000.ethernet eth1:  interface 4 (sgmii) rate match none supports 0-3,5-7,13-14
> [   39.249173] mtk_soc_eth 15100000.ethernet eth1:  interface 22 (1000base-x) rate match none supports 5-7,13-14
> [   39.259080] mtk_soc_eth 15100000.ethernet eth1:  interface 23 (2500base-x) rate match none supports 6-7,13-14,47
> [   39.594676] mtk_soc_eth 15100000.ethernet eth1: PHY i2c:sfp-1:11 uses interfaces 4,23, validating 4,23

The PHY comes along...

> [   39.603992] mtk_soc_eth 15100000.ethernet eth1:  interface 4 (sgmii) rate match none supports 0-3,5-7,13-14
> [   39.650080] mtk_soc_eth 15100000.ethernet eth1:  interface 23 (2500base-x) rate match none supports 6-7,13-14,47
> [   39.660266] mtk_soc_eth 15100000.ethernet eth1: PHY [i2c:sfp-1:11] driver [RTL8221B-VB-CG 2.5Gbps PHY (C45)] (irq=POLL)
> [   39.671037] mtk_soc_eth 15100000.ethernet eth1: phy: 2500base-x setting supported 00,00000000,00008000,000060ef advertising 00,00000000,00008000,000060ef
> [   39.684761] mtk_soc_eth 15100000.ethernet eth1: requesting link mode inband/2500base-x with support 00,00000000,00008000,000060ef

We decide to use MLO_AN_INBAND and 2500base-X, which we're already using.

> [   40.380076] mtk_soc_eth 15100000.ethernet eth1: phy link down 2500base-x/Unknown/Unknown/none/off
> [   40.397090] brlan: port 5(eth1) entered blocking state
> [   40.402223] brlan: port 5(eth1) entered disabled state
> [   40.407437] mtk_soc_eth 15100000.ethernet eth1: entered allmulticast mode
> [   40.414400] mtk_soc_eth 15100000.ethernet eth1: entered promiscuous mode
> [   44.500077] mtk_soc_eth 15100000.ethernet eth1: phy link up 2500base-x/2.5Gbps/Full/none/off
> [   44.508528] mtk_soc_eth 15100000.ethernet eth1: No phy led trigger registered for speed(2500)

... but we don't see link-up reported by the PCS after the PHY comes
up. Why is that - I think that needs investigation before we proceed
to patch the issue, because that suggests the PCS isn't seeing
valid 2500base-X from the PHY.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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