On 2/17/2026 9:15 AM, Paul Menzel wrote:
Hi Paul,
I spoke to one of our link people about this.
It works with Broadcom network controller BCM57414:
$ lspci -nn -s c4:00
c4:00.0 Ethernet controller [0200]: Broadcom Inc. and subsidiaries
BCM57414 NetXtreme-E 10Gb/25Gb RDMA Ethernet Controller [14e4:16d7] (rev
01)
c4:00.1 Ethernet controller [0200]: Broadcom Inc. and subsidiaries
BCM57414 NetXtreme-E 10Gb/25Gb RDMA Ethernet Controller [14e4:16d7] (rev
01)
The difference seems to be that the Broadcom device supports auto-
negotiation, and the Intel device does not:
Strictly speaking, optical links do not provide auto-negotiation.
Intel E810-XXV:
Supported ports: [ FIBRE ]
Supported link modes: 1000baseT/Full
10000baseT/Full
25000baseCR/Full
25000baseSR/Full
1000baseX/Full
10000baseCR/Full
10000baseSR/Full
10000baseLR/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: No
Supported FEC modes: None
Advertised link modes: 25000baseSR/Full
The important part is here 10G is not an advertised link mode...
Advertised pause frame use: No
Advertised auto-negotiation: No
Advertised FEC modes: None
Speed: Unknown!
Duplex: Unknown! (255)
Auto-negotiation: off
Port: FIBRE
PHYAD: 0
Transceiver: internal
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: no
Broadcom BCM57414 NetXtreme-E:
Supported ports: [ FIBRE ]
Supported link modes: 25000baseSR/Full
10000baseSR/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: RS BASER
Advertised link modes: 25000baseSR/Full
10000baseSR/Full
... where it is here.
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: Unknown!
Duplex: Unknown! (255)
Auto-negotiation: on
Port: FIBRE
PHYAD: 1
Transceiver: internal
Supports Wake-on: g
Wake-on: d
Current message level: 0x00002081 (8321)
drv tx_err hw
Link detected: no
Kind regards,
Paul
PS:
```
$ ip link show net04
7: net04: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq
switchid b48351ffff278d44 state DOWN mode DEFAULT group default qlen 1000
link/ether b4:83:51:27:8d:44 brd ff:ff:ff:ff:ff:ff
alias eth4
$ sudo ethtool -m net04
Identifier : 0x03 (SFP)
Extended identifier : 0x04 (GBIC/SFP
defined by 2-wire interface ID)
Connector : 0x07 (LC)
Transceiver codes : 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x02
0x10 would be here for advertised 10G support. It is not, which is why
it's not being advertised. He mentioned it's very common for dual rates
to claim it on paper but not advertise it properly.
Could you provide the output for 'ethool -m <INT> hex on'?
Thanks,
Tony
