[FS#3932] [21.02] Autonegotiation speed fails with my provider's cable

[OpenWrt Bugs]

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User who did this - darkblaze69 (darkblaze69) 

Attached to Project - OpenWrt/LEDE Project
Summary - [21.02] Autonegotiation speed fails with my provider's cable
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on: xiaomi mir3g
 - 21.02 rc3
 - My provider uses pppoe, cable is 4-wire 100baseT and my router is 1000baseT xiaomi mir3g
   
openwrt 21.02 fails to establish pppoe link because of failing to autonegotiate (Speed: Unknown!, Link detected: no, etc):
# ethtool wan
Settings for wan:
	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: Symmetric Receive-only
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: Unknown!
	Duplex: Unknown! (255)
	Port: MII
	PHYAD: 1
	Transceiver: external
	Auto-negotiation: on
	Supports Wake-on: d
	Wake-on: d
	Link detected: no

When I set autonegotiation to off and forced to 100baseT/Full, pppoe worked like a charm.

/usr/sbin/ethtool -s wan speed 100 duplex full autoneg off

# ethtool wan
Settings for wan:
	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:  100baseT/Full 
	Advertised pause frame use: Symmetric Receive-only
	Advertised auto-negotiation: No
	Advertised FEC modes: Not reported
	Speed: 100Mb/s
	Duplex: Full
	Port: MII
	PHYAD: 1
	Transceiver: external
	Auto-negotiation: off
	Supports Wake-on: d
	Wake-on: d
	Link detected: yes

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3932

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