netdev - bridge mdb json output broken/invalid

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Date:   Fri, 5 Apr 2019 15:59:03 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Roopa Prabhu <roopa@...ulusnetworks.com>,
        David Ahern <dsa@...ulusnetworks.com>,
        network dev <netdev@...r.kernel.org>
Subject: bridge mdb json output broken/invalid

Hi Stephen,
It seems that commit c7c1a1ef51aea ("bridge: colorize output and use JSON print library") broke
bridge mdb's json output. The json after that commit is invalid, more below.

Setup: 2 bridges - virbr0 and br-test

non-json bridge mdb show:
3: virbr0  vnet3  239.10.10.50  temp 
3: virbr0  vnet3  225.1.2.3  temp 
14: br-test  v1  224.224.224.224  permanent 

json bridge -d -p -j mdb show before c7c1a1ef51aea:
{
    "mdb": [ {
            "dev": "virbr0",
            "port": "vnet3",
            "grp": "239.10.10.50",
            "state": "temp"
        },{
            "dev": "virbr0",
            "port": "vnet3",
            "grp": "225.1.2.3",
            "state": "temp"
        },{
            "dev": "br-test",
            "port": "v1",
            "grp": "224.224.224.224",
            "state": "permanent"
        } ],
    "router": {
        "virbr0": [ {
                "port": "vnet3"
            } ],
        "br-test": [ {
                "port": "v1"
            } ]
    }
}

json bridge -d -p -j mdb show after c7c1a1ef51aea:
[ 
    "mdb": [ {
            "index": 3,
            "dev": "virbr0",
            "port": "vnet3",
            "grp": "239.10.10.50",
            "state": "temp",
            "flags": [ ]
        },{
            "index": 3,
            "dev": "virbr0",
            "port": "vnet3",
            "grp": "225.1.2.3",
            "state": "temp",
            "flags": [ ]
        } ],
    "router": [ 
        "virbr0": [ {
                "port": "vnet3"
            } ] ],
    "mdb": [ ],
    "mdb": [ {
            "index": 14,
            "dev": "br-test",
            "port": "v1",
            "grp": "224.224.224.224",
            "state": "permanent",
            "flags": [ ]
        } ],
    "router": [ 
        "br-test": [ {
                "port": "v1"
            } ] ] ]


Obviously this is not a valid object array and even if it was converted, it must not contain
duplicate entries. The "mdb" and "router" array entries must be unique and should contain
all the single entries inside, also the global context shouldn't be array.

Cheers,
 Nik