Dell Poweedge 750 Mellanox ConnectX-6 LX with 1G SFP SX

[Joerg Streckfuss]

Hi misc,





<snip>
mcx5: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr a0:88:c2:33:d1:b7
        index 8 priority 0 llprio 3
        media: Ethernet autoselect
        status: no carrier
        supported media:
                media 1000base-SGMII
                media 1000base-KX
                media 10GbaseKR
                media 10GSFP+Cu
                media 10GbaseSR
                media 10GbaseLR
                media 25GbaseCR
                media 25GbaseKR
                media 25GbaseSR
                media autoselect
<snap>

The SFP is recognized correctly:

<snip>
fw# ifconfig mcx5 transceiver
mcx5: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr a0:88:c2:33:d1:b7
        index 8 priority 0 llprio 3
        media: Ethernet autoselect
        status: no carrier
        transceiver: SFP LC, 850 nm, 270m OM1, 550m OM2
        model: FLEXOPTIX S.8512.02.D rev A
        serial: F7AM3CB, date: 2023-06-13
        voltage: 3.30 V, bias current: 9.70 mA
        temp: 40.60 C (low -10.00 C, high 85.00 C)
        tx: -6.30 dBm (low -12.00 dBm, high -1.00 dBm)
        rx: -8.40 dBm (low -20.00 dBm, high 1.00 dBm)
<snap>



<snip>
tcpdump: listening on mcx5, link-type EN10MB

...
<snap>






Regards,

Joerg


--
Dipl.-Ing. (FH) Joerg Streckfuss M.Sc. (Senior IT-Specialist)

DFN-CERT Services GmbH, https://www.dfn-cert.de/, Phone  +49 40 808077-555
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I am trying to connect a 1GE SFP of type 1G SFP SX (Flexoptix S.8512.02.D) to a Power Edge R750 with a Connect Mellanox ConnectX-6 Lx. The mellanox driver supports the corresponding mode. I think it should be "1000base-SGMII": However, the status remains in state "no carrier". It is interesting to note that the interface can obviously receive network packets: Mar 14 09:04:16.675476 802.1Q vid 1004 pri 6 CARPv2-advertise 36: vhid=1 advbase=1 advskew=0 demote=0 (DF) [tos 0x10] Mar 14 09:04:16.675476 802.1Q vid 1003 pri 6 CARPv2-advertise 36: vhid=1 advbase=1 advskew=0 demote=0 (DF) [tos 0x10] These network packets are sent from another system. This means that things seem to work in the receiving direction. In the same system there are mellanox connectX-5 nics. The 1GE-SFP works flawlessly with it.

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