Added json support intfutil

[vikumarks]

What I did

Added json output supoort for

intfutil -c autoneg -j
intfutil -c fec -j
intfutil -c status -j
intfutil -c description -j
intfutil -c tpid -j
intfutil -c link_training -j

How I did it

How to verify it

admin@str-7060x6-64pe-stress-01:~$ intfutil -c status -i Ethernet0 -j
{
    "Ethernet0": {
        "Admin": "up",
        "Alias": "Ethernet1/1",
        "Asym PFC": "off",
        "FEC": "rs",
        "Lanes": "17",
        "MTU": "9100",
        "Oper": "up",
        "Speed": "100G",
        "Type": "OSFP 8X Pluggable Transceiver",
        "Vlan": "trunk"
    }
}
admin@str-7060x6-64pe-stress-01:~$ intfutil -c description -i Ethernet0 -j
{
    "Ethernet0": {
        "Admin": "up",
        "Alias": "Ethernet1/1",
        "Description": "Servers0:eth0",
        "Oper": "up"
    }
}
admin@str-7060x6-64pe-stress-01:~$ intfutil -c autoneg -i Ethernet0 -j
{
    "Ethernet0": {
        "Admin": "up",
        "Adv Speeds": "N/A",
        "Adv Types": "N/A",
        "Auto-Neg Mode": "N/A",
        "Oper": "up",
        "Rmt Adv Speeds": "N/A",
        "Speed": "100G",
        "Type": "N/A"
    }
}
admin@str-7060x6-64pe-stress-01:~$ intfutil -c tpid -i Ethernet0 -j
{
    "Ethernet0": {
        "Admin": "up",
        "Alias": "Ethernet1/1",
        "Oper": "up",
        "TPID": "0x8100"
    }
}
admin@str-7060x6-64pe-stress-01:~$ intfutil -c link_training -i Ethernet0 -j
{
    "Ethernet0": {
        "Admin": "up",
        "LT Admin": "N/A",
        "LT Oper": "N/A",
        "Oper": "up"
    }
}
admin@str-7060x6-64pe-stress-01:~$ intfutil -c fec -i Ethernet0 -j
{
    "Ethernet0": {
        "FEC Admin": "rs",
        "FEC Oper": "N/A"
    }
}

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)

[zhangyanzhao]

@qiluo-msft can you please help to review? Thanks.

[Copilot]

Pull Request Overview

This PR adds JSON output support to the intfutil script for multiple commands (status, description, autoneg, tpid, link_training, fec).

• Introduces --json (-j) CLI flag and imports table_as_json
• Updates each Intf* class constructor to accept use_json and conditionally print JSON
• Propagates the new flag through main() when instantiating and displaying results

Comments suppressed due to low confidence (3)

doc/Command-Reference.md:1

• Update the Command Line Reference Guide to document the new -j/--json flag for intfutil.

<Add section for `intfutil -j`>

scripts/intfutil:900

• Add or update unit tests in the tests/ directory to cover the new JSON output path (--json flag) and validate the structure returned by table_as_json.

parser.add_argument('-j', '--json', action='store_true', help='Display in JSON format')

scripts/intfutil:455

• [nitpick] The repeated if self.use_json: print(table_as_json(...)) else: print(tabulate(...)) pattern appears in multiple methods; consider extracting a helper function to reduce duplication and improve maintainability.

def display_intf_status(self):

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

Cherry-pick PR to msft-202412: Azure/sonic-utilities.msft#220

[mssonicbld]

Cherry-pick PR to 202505: #4023