Boot messages for stable/11:

t6nex0: <Chelsio T6225-CR> mem 0xfac80000-0xfacfffff,0xf9000000-0xf9ffffff,0xfaff6000-0xfaff7fff irq 16 at device 0.4 on pci6
t6nex0: firmware on card (1.16.63.0) is older than the version bundled with this driver, installing firmware 1.19.1.0 on card.
cc0: <port 0> on t6nex0
cc0: Ethernet address: 00:07:43:XX:XX:X0
cc0: 4 txq, 4 rxq (NIC); 4 txq, 2 rxq (TOE)
cc1: <port 1> on t6nex0
cc1: Ethernet address: 00:07:43:XX:XX:X8
cc1: 4 txq, 4 rxq (NIC); 4 txq, 2 rxq (TOE)
t6nex0: PCIe gen2 x4, 2 ports, 14 MSI-X interrupts, 31 eq, 13 iq
pci6: <mass storage, SCSI> at device 0.5 (no driver attached)
pci6: <serial bus, Fibre Channel> at device 0.6 (no driver attached)

The firmware was in need of an upgrade.

Output from ifconfig ‑mv:

cc0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=ec07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 00:07:43:XX:XX:X0
        hwaddr 00:07:43:XX:XX:X0
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet 25GBase-SR <full-duplex,rxpause,txpause>
        status: no carrier
        supported media:
                media 10Gbase-SR mediaopt full-duplex,rxpause,txpause
                media 10Gbase-SR mediaopt full-duplex,rxpause
                media 10Gbase-SR mediaopt full-duplex,txpause
                media 10Gbase-SR mediaopt full-duplex
                media 25GBase-SR mediaopt full-duplex,rxpause,txpause
                media 25GBase-SR mediaopt full-duplex,rxpause
                media 25GBase-SR mediaopt full-duplex,txpause
                media 25GBase-SR mediaopt full-duplex
                media 1000baseSX mediaopt full-duplex,rxpause,txpause
                media 1000baseSX mediaopt full-duplex,rxpause
                media 1000baseSX mediaopt full-duplex,txpause
                media 1000baseSX mediaopt full-duplex
        plugged: SFP/SFP+/SFP28 100GBASE-SR4 or 25GBASE-SR (LC)
        vendor: GIGALIGHT PN: SM25G-SR SN: M18060XXXXX DATE: 2018-06-07
        module temperature: 60.53 C Voltage: 3.20 Volts
        RX: 0.00 mW (-40.00 dBm) TX: 0.75 mW (-1.20 dBm)
cc1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=ec07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 00:07:43:XX:XX:X8
        hwaddr 00:07:43:XX:XX:X8
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet 25GBase-SR <full-duplex,rxpause,txpause>
        status: no carrier
        supported media:
                media 10Gbase-SR mediaopt full-duplex,rxpause,txpause
                media 10Gbase-SR mediaopt full-duplex,rxpause
                media 10Gbase-SR mediaopt full-duplex,txpause
                media 10Gbase-SR mediaopt full-duplex
                media 25GBase-SR mediaopt full-duplex,rxpause,txpause
                media 25GBase-SR mediaopt full-duplex,rxpause
                media 25GBase-SR mediaopt full-duplex,txpause
                media 25GBase-SR mediaopt full-duplex
                media 1000baseSX mediaopt full-duplex,rxpause,txpause
                media 1000baseSX mediaopt full-duplex,rxpause
                media 1000baseSX mediaopt full-duplex,txpause
                media 1000baseSX mediaopt full-duplex
        plugged: SFP/SFP+/SFP28 100GBASE-SR4 or 25GBASE-SR (LC)
        vendor: GIGALIGHT PN: SM25G-SR SN: M18060XXXXX DATE: 2018-06-07
        module temperature: 59.22 C Voltage: 3.21 Volts
        RX: 0.00 mW (-40.00 dBm) TX: 0.81 mW (-0.86 dBm)

Only the cc0 port is connected to the switch, but none of the ports have detected a carrier. I tried swapping the fiber strands to no avail. For some reason, I was unable to select 10 Gbit/s using ifconfig cc0 media 10Gbase‑SR. I’m waiting for some SFP+ modules to arrive, maybe they can connect to the switch.

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BTW. The Gutenberg Editor for WordPress is a nightmare in conjunction with the SyntaxHighlighter plugin. I went back to the Classic Editor which gives me far more control.

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