[Intel-wired-lan] ice: E810-XXV: Dell GBIC S28-10G-25G-SR-85C does not work
Paul Menzel
pmenzel at molgen.mpg.de
Tue Feb 17 17:15:23 UTC 2026
Dear Linux folks,
Just a follow-up:
Am 12.02.26 um 15:06 schrieb Paul Menzel:
> On a Dell PowerEdge R7615 with
>
> $ sudo lspci -nn -s 81:00.0
> 81:00.0 Ethernet controller [0200]: Intel Corporation Ethernet Controller E810-XXV for SFP [8086:159b] (rev 02)
> $ sudo lspci -nn -s 81:00.1
> 81:00.1 Ethernet controller [0200]: Intel Corporation Ethernet Controller E810-XXV for SFP [8086:159b] (rev 02)
>
> the GBIC DELL S28-10G-25G-SR-85C is not giving a link, when connecting
> an LWL cable. The link gets up with another SFP+ GBIC:
>
> [13332.522461] ice 0000:81:00.1 net05: NIC Link is up 10 Gbps Full Duplex, Requested FEC: NONE, Negotiated FEC: NONE, Autoneg Advertised: Off, Autoneg Negotiated: False, Flow Control: None
> [13888.522978] ice 0000:81:00.1 net05: NIC Link is Down
>
> Currently, Linux 6.12.49 is used.
>
> $ grep CONFIG_ICE /boot/config-6.12.49.mx64.487
> CONFIG_ICE=m
> CONFIG_ICE_HWMON=y
> CONFIG_ICE_HWTS=y
>
> The strange thing is, that the module info shows:
>
> $ sudo ethtool -m net04
> […]
> Transceiver type : Extended: 100G Base-SR4 or 25GBase-SR
>
> But instead of 100G and 25G this GBIC should only support 10G and 25G.
> (Or it just means, that 100G is four times 25G.)
>
> Anyway, I tried to increase the debug level:
>
> $ modinfo ice
> […]
> parm: debug:netif level (0=none,...,16=all) (int)
> $ echo 16 | sudo tee /sys/module/ice/parameters/debug
>
> But re-plugging the GBIC not more message were shown. Please find the
> output of `dmesg` attached.
>
> What I am doing wrong?
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:
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
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
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
> Transceiver type : Extended: 100G Base-SR4 or 25GBase-SR
> Encoding : 0x06 (64B/66B)
> BR, Nominal : 25750MBd
> Rate identifier : 0x10 (reserved or unknown)
> Length (SMF,km) : 0km
> Length (SMF) : 0m
> Length (50um) : 0m
> Length (62.5um) : 0m
> Length (Copper) : 10m
> Length (OM3) : 70m
> Laser wavelength : 850nm
> Vendor name : DELL EMC
> Vendor OUI : 78:a7:14
> Vendor PN : M14MK
> Vendor rev : A1
> Option values : 0x08 0x3a
> Option : RX_LOS implemented
> Option : TX_FAULT implemented
> Option : TX_DISABLE implemented
> Option : RATE_SELECT implemented
> Option : Retimer or CDR implemented
> BR margin, max : 0%
> BR margin, min : 0%
> Vendor SN : VN0AP8005718922
> Date code : 250827
> Optical diagnostics support : Yes
> Laser bias current : 5.500 mA
> Laser output power : 0.9275 mW / -0.33 dBm
> Receiver signal average optical power : 0.6587 mW / -1.81 dBm
> Module temperature : 32.11 degrees C / 89.80 degrees F
> Module voltage : 3.3978 V
> Alarm/warning flags implemented : Yes
> Laser bias current high alarm : Off
> Laser bias current low alarm : Off
> Laser bias current high warning : Off
> Laser bias current low warning : Off
> Laser output power high alarm : Off
> Laser output power low alarm : Off
> Laser output power high warning : Off
> Laser output power low warning : Off
> Module temperature high alarm : Off
> Module temperature low alarm : Off
> Module temperature high warning : Off
> Module temperature low warning : Off
> Module voltage high alarm : Off
> Module voltage low alarm : Off
> Module voltage high warning : Off
> Module voltage low warning : Off
> Laser rx power high alarm : Off
> Laser rx power low alarm : Off
> Laser rx power high warning : Off
> Laser rx power low warning : Off
> Laser bias current high alarm threshold : 13.000 mA
> Laser bias current low alarm threshold : 0.500 mA
> Laser bias current high warning threshold : 11.000 mA
> Laser bias current low warning threshold : 1.000 mA
> Laser output power high alarm threshold : 2.1878 mW / 3.40 dBm
> Laser output power low alarm threshold : 0.1148 mW / -9.40 dBm
> Laser output power high warning threshold : 1.7378 mW / 2.40 dBm
> Laser output power low warning threshold : 0.1445 mW / -8.40 dBm
> Module temperature high alarm threshold : 90.00 degrees C / 194.00 degrees F
> Module temperature low alarm threshold : -5.00 degrees C / 23.00 degrees F
> Module temperature high warning threshold : 88.00 degrees C / 190.40 degrees F
> Module temperature low warning threshold : 0.00 degrees C / 32.00 degrees F
> Module voltage high alarm threshold : 3.5000 V
> Module voltage low alarm threshold : 3.0800 V
> Module voltage high warning threshold : 3.4800 V
> Module voltage low warning threshold : 3.1000 V
> Laser rx power high alarm threshold : 2.1878 mW / 3.40 dBm
> Laser rx power low alarm threshold : 0.0741 mW / -11.30 dBm
> Laser rx power high warning threshold : 1.7378 mW / 2.40 dBm
> Laser rx power low warning threshold : 0.0933 mW / -10.30 dBm
> ```
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