Hello,
I've some sample code for Clause 73 support using Synopsys based XPCS
but I would like to clarify some things that I noticed.
I'm using USXGMII as interface and a single SERDES that operates at 10G
rate but MAC side is working at 2.5G. Maximum available bandwidth is
therefore 2.5Gbps.
So, I configure USXGMII for 2.5G mode and it works but if I try to limit
the autoneg abilities to 2.5G max then it never finishes:
# ethtool enp4s0
Settings for enp4s0:
Supported ports: [ ]
Supported link modes: 1000baseKX/Full
2500baseX/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 1000baseKX/Full
2500baseX/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: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: ug
Wake-on: d
Current message level: 0x0000003f (63)
drv probe link timer ifdown ifup
Link detected: no
When I do not limit autoneg and I say that maximum limit is 10G then I
get Link Up and autoneg finishes with this outcome:
# ethtool enp4s0
Settings for enp4s0:
Supported ports: [ ]
Supported link modes: 1000baseKX/Full
2500baseX/Full
10000baseKX4/Full
10000baseKR/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 1000baseKX/Full
2500baseX/Full
10000baseKX4/Full
10000baseKR/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 1000baseKX/Full
2500baseX/Full
10000baseKX4/Full
10000baseKR/Full
Link partner advertised pause frame use: Symmetric Receive-only
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 2500Mb/s
Duplex: Full
Port: MII <- Never mind this, it's a SW issue
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: ug
Wake-on: d
Current message level: 0x0000003f (63)
drv probe link timer ifdown ifup
Link detected: yes
I was expecting that, as MAC side is limited to 2.5G, I should set in
phylink the correct capabilities and then outcome of autoneg would only
have up to 2.5G modes. Am I wrong ?
---
Thanks,
Jose Miguel Abreu
