[FS#4032] Uplink ethernet ports not connecting at gigabit speeds (Ath79)

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Peter Sherman (psherman) 

Attached to Project - OpenWrt/LEDE Project
Summary - Uplink ethernet ports not connecting at gigabit speeds (Ath79)
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details -  - Device problem occurs on
2 devices known at the present time: Ubiquiti RouterStation Pro and Buffalo WZR-HP-AG300H

 - Software versions of OpenWrt/LEDE release, packages, etc.
21.02.0 stable release (did not test RC versions).

 - Steps to reproduce
Upgrade device to 21.02.0 and observe the uplink ethernet port speeds. Install ethtool and look at the supported link speeds for eth0 (RSPro) (eth1 on the WZR-HP-AG300H).

 - More info
This issue presents on 21.02.0, but not on 19.07.x and it affects only eth0 on the RSPro -- limiting the uplink speed to 100Mbps. Forcing the link to 1000Mbps causes the link to fail. This does not affect eth1 (3-port switch) which still works at gigabit speeds. 

On the RSPro, I have tested with 19.07.8 (ath79) and 21.02.0 (ath79), both completely fresh installations from official stable images with no changes to the default configs or packages except for the installation of ethtool. I used known good cables connected to the device and did not physically change anything between the different images. Upstream is a Ubiquiti Unifi Flex Mini (gigabit) switch, and downstream (on eth1) is a 2009 Mac Pro (gigabit).
----
**The following is the ethtool output from 21.02.0:
**

root at OpenWrt:~# ethtool eth0
Settings for eth0:
	Supported ports: [ TP MII ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/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 
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Link partner advertised link modes:  10baseT/Half 10baseT/Full 
	                                     100baseT/Half 100baseT/Full 
	Link partner advertised pause frame use: No
	Link partner advertised auto-negotiation: Yes
	Link partner advertised FEC modes: Not reported
	Speed: 100Mb/s
	Duplex: Full
	Port: MII
	PHYAD: 4
	Transceiver: external
	Auto-negotiation: on
	Current message level: 0x000000ff (255)
			       drv probe link timer ifdown ifup rx_err tx_err
	Link detected: yes
----
**And this is the ethtool output when running on 19.07.8.
**

root at OpenWrt:~# ethtool eth0
Settings for eth0:
	Supported ports: [ TP MII ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        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/Full 
	Advertised pause frame use: No
	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: No
	Link partner advertised auto-negotiation: Yes
	Link partner advertised FEC modes: Not reported
	Speed: 1000Mb/s
	Duplex: Full
	Port: MII
	PHYAD: 4
	Transceiver: internal
	Auto-negotiation: on
	Current message level: 0x000000ff (255)
			       drv probe link timer ifdown ifup rx_err tx_err
	Link detected: yes
----

Details can be found in [[https://forum.openwrt.org/t/possible-21-02-0-bug-with-routerstation-pro-ethernet-speed/105594|my original post]] about the RouterStation Pro and in this one for the [[https://forum.openwrt.org/t/uplink-port-not-negotiating-gigabit-speed-after-21-02-update/105906|Buffalo device]].
 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4032

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