Subject: Re: [PATCH iproute2-next master] bridge: fdb show: fix fdb entry state output for json context

From: Stephen Hemminger <[email-masked]>
Date: Mon, 13 Jul 2020 07:54:45 -0700

On Fri, 10 Jul 2020 02:50:55 +0200
Julien Fortin <[email-masked]> wrote:

> From: Julien Fortin <[email-masked]>
> 
> bridge json fdb show is printing an incorrect / non-machine readable
> value, when using -j (json output) we are expecting machine readable
> data that shouldn't require special handling/parsing.
> 
> $ bridge -j fdb show | \
> python -c \
> 'import sys,json;print(json.dumps(json.loads(sys.stdin.read()),indent=4))'
> [
>     {
>         "master": "br0",
>         "mac": "56:23:28:4f:4f:e5",
>         "flags": [],
>         "ifname": "vx0",
>         "state": "state=0x80"  <<<<<<<<< with the patch: "state": "0x80"
>     }
> ]
> 
> Fixes: c7c1a1ef51aea7c ("bridge: colorize output and use JSON print library")
> Signed-off-by: Julien Fortin <[email-masked]>
> ---
>  bridge/fdb.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/bridge/fdb.c b/bridge/fdb.c
> index d2247e80..198c51d1 100644
> --- a/bridge/fdb.c
> +++ b/bridge/fdb.c
> @@ -62,7 +62,10 @@ static const char *state_n2a(unsigned int s)
>  	if (s & NUD_REACHABLE)
>  		return "";
>  
> -	sprintf(buf, "state=%#x", s);
> +	if (is_json_context())
> +		sprintf(buf, "%#x", s);
> +	else
> +		sprintf(buf, "state=%#x", s);
>  	return buf;
>  }
>  

Printing in non JSON case was also wrong.
i.e.
              ...  state state=0x80
should be:
	      ... state 0x80

Let's do that.

The state=xxx value only shows up if the FDB entry has a value bridge command
doesn't understand. The bridge command needs to be able to display the new flag values.

Please fixup the two patches and resubmit to iproute2