7170-64c SFP+ Backplane Drivers

[jimthedj65]

Hi All,

We have SONiC build SONiC Software Version: SONiC.master.203398-5e4a866e3 Distribution: Debian 11.6 Kernel: 5.10.0-18-2-amd64 Build commit: 5e4a866e3 Build date: Sun Jan 15 15:19:36 UTC 2023 Built by: AzDevOps@vmss-soni000BCY

Platform: x86_64-arista_7170_64c HwSKU: Arista-7170-64C ASIC: barefoot ASIC Count: 1 Serial Number: SGD19xXxxxxx Model Number: DCS-7170-64C Hardware Revision: 02.00 Uptime: 13:55:25 up 5 days, 23:42, 1 user, load average: 1.02, 1.01, 1.00 Date: Fri 27 Jan 2023 13:55:25

We can list our 64 100GBE ports and can see the management ports on eth0 etc.

How do we configure the 10GBE SFP+ ports I think these are showing up as backplane ports like so

root@sonic:/sys/devices# lspci |grep Ethernet 01:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM57762 Gigabit Ethernet PCIe (rev 20) 02:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM57762 Gigabit Ethernet PCIe (rev 20) 04:00.0 Ethernet controller: Intel Corporation Ethernet Connection X552 10 GbE Backplane 04:00.1 Ethernet controller: Intel Corporation Ethernet Connection X552 10 GbE Backplane

any guidance or pointers appreciated.

[Staphylo]

Hi @jimthedj65

The "backplane" ports that you see are not related to the SFP ports.

01:00.0 (eth1) -> unused
02:00.0 (eth0) -> management interface 1G
04:00.0 (tmp3) & 04:00.1 (tmp4) -> 2 x 10G links between the CPU and the Tofino ASIC

On the topic of the SFP+ ports you should be good by simply appending the following content to your PORT table in config_db.json

    "Ethernet256": {
        "alias": "Ethernet65",
            "fec": "none",
        "index": "65",
        "lanes": "256",
        "mtu": "9100",
            "pfc_asym": "off",
        "speed": "10000"
    },
    "Ethernet257": {
        "alias": "Ethernet66",
            "fec": "none",
        "index": "66",
        "lanes": "257",
        "mtu": "9100",
            "pfc_asym": "off",
        "speed": "10000"
    }

[Staphylo]

As replied to the sonic-dev mailing list, there is a runtime way to add the ports without restarting the dataplane.

sonic-db-cli CONFIG_DB hset "PORT|Ethernet256" alias Ethernet65 fec none index 65 lanes 256 mtu 9100 pfc_asym off speed 10000 admin_status up
sonic-db-cli CONFIG_DB hset "PORT|Ethernet257" alias Ethernet66 fec none index 66 lanes 257 mtu 9100 pfc_asym off speed 10000 admin_status up

Closing this issue as the initial problem is solved.

[jimthedj65]

Thanks for clarifying