netdev - RE: sun7i-dwmac: link detection failure with 1000Mbit parters

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Date:   Thu, 31 Oct 2019 08:39:06 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Priit Laes <plaes@...es.org>,
        "linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>,
        "wens@...e.org" <wens@...e.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>
CC:     "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "alexandre.torgue@...com" <alexandre.torgue@...com>
Subject: RE: sun7i-dwmac: link detection failure with 1000Mbit parters

++ Florian, Andrew, Heiner, Russell

Can you please attach your dmesg log ? PHYLINK provides some useful 
debug logs.

From: Priit Laes <plaes@...es.org>
Date: Oct/30/2019, 20:21:17 (UTC+00:00)

> Heya!
> 
> I have noticed that with sun7i-dwmac driver (OLinuxino Lime2 eMMC), link
> detection fails consistently with certain 1000Mbit partners (for example Huawei
> B525s-23a 4g modem ethernet outputs and RTL8153-based USB3.0 ethernet dongle),
> but the same hardware works properly with certain other link partners (100Mbit GL AR150
> for example).
> 
> (Just need to test with another 1000Mbit switch at the office).
> 
> I first thought it could be a regression, but I went from current master to as far back
> as 5.2.0-rc6 where it was still broken.
> 
> Failure is basically following:
> 
> [   10.971485] sun7i-dwmac 1c50000.ethernet eth0: PHY [stmmac-0:01] driver [Generic PHY]
> [   10.980841] sun7i-dwmac 1c50000.ethernet eth0: No Safety Features support found
> [   10.988291] sun7i-dwmac 1c50000.ethernet eth0: RX IPC Checksum Offload disabled
> [   10.995694] sun7i-dwmac 1c50000.ethernet eth0: No MAC Management Counters available
> [   11.003381] sun7i-dwmac 1c50000.ethernet eth0: PTP not supported by HW
> [   11.009927] sun7i-dwmac 1c50000.ethernet eth0: configuring for phy/rgmii link mode
> ... link and activity leds go blank ...
> ... remove and replug and link is detected again ...
> [   19.371894] sun7i-dwmac 1c50000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
> 
> Ethtool output in case link is down:
> [snip]
> 	Supported ports: [ TP MII ]
> 	Supported link modes:   10baseT/Half 10baseT/Full 
> 	                        100baseT/Half 100baseT/Full 
> 	                        1000baseT/Half 1000baseT/Full 
> 	Supported pause frame use: Symmetric Receive-only
> 	Supports auto-negotiation: Yes
> 	Supported FEC modes: Not reported
> 	Advertised link modes:  10baseT/Half 10baseT/Full 
> 	                        100baseT/Half 100baseT/Full 
> 	                        1000baseT/Half 1000baseT/Full 
> 	Advertised pause frame use: Symmetric Receive-only
> 	Advertised auto-negotiation: Yes
> 	Advertised FEC modes: Not reported
> 	Speed: Unknown!
> 	Duplex: Unknown! (255)
> 	Port: MII
> 	PHYAD: 1
> 	Transceiver: internal
> 	Auto-negotiation: on
> 	Supports Wake-on: d
> 	Wake-on: d
> 	Current message level: 0x0000003f (63)
> 			       drv probe link timer ifdown ifup
> 	Link detected: no
> [/snip]
> 
> And ethtool output in case cable is removed and replugged:
> [snip]
> ethtool eth0
> Settings for eth0:
> 	...cut...
> 	Advertised pause frame use: Symmetric Receive-only
> 	Advertised auto-negotiation: Yes
> 	Advertised FEC modes: Not reported
> 	Link partner advertised link modes:  10baseT/Half 10baseT/Full 
> 	                                     100baseT/Half 100baseT/Full 
> 	                                     1000baseT/Full 
> 	Link partner advertised pause frame use: Symmetric
> 	Link partner advertised auto-negotiation: Yes
> 	Link partner advertised FEC modes: Not reported
> 	Speed: 1000Mb/s
> 	Duplex: Full
> 	Port: MII
> 	PHYAD: 1
> 	Transceiver: internal
> 	Auto-negotiation: on
> 	Supports Wake-on: d
> 	Wake-on: d
> 	Current message level: 0x0000003f (63)
> 			       drv probe link timer ifdown ifup
> 	Link detected: yes
> [/snip]
> 
> 
> With 100Mbit link partner (GL Inet AR150), the link is pulled up almost
> immediately:
> [   15.531754] sun7i-dwmac 1c50000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
> 
> [snip]
> Settings for eth0:
> 	... cut ...
> 	Link partner advertised link modes:  10baseT/Half 10baseT/Full 
> 	                                     100baseT/Half 100baseT/Full 
> 	Link partner advertised pause frame use: Symmetric Receive-only
> 	Link partner advertised auto-negotiation: Yes
> 	Link partner advertised FEC modes: Not reported
> 	Speed: 100Mb/s
> 	Duplex: Full
> 	Port: MII
> 	PHYAD: 1
> 	Transceiver: internal
> 	Auto-negotiation: on
> 	Supports Wake-on: d
> 	Wake-on: d
> 	Current message level: 0x0000003f (63)
> 			       drv probe link timer ifdown ifup
> 	Link detected: yes
> [/snip]


---
Thanks,
Jose Miguel Abreu