netdev - [PATCH iproute2 2/2] tc/taprio: fix JSON output when TCA_TAPRIO_ATTR_ADMIN

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Message-Id: <20230807160827.4087483-2-vladimir.oltean@nxp.com>
Date: Mon,  7 Aug 2023 19:08:27 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: David Ahern <dsahern@...nel.org>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: [PATCH iproute2 2/2] tc/taprio: fix JSON output when TCA_TAPRIO_ATTR_ADMIN_SCHED is present

When the kernel reports that a configuration change is pending
(and that the schedule is still in the administrative state and
not yet operational), we (tc -j -p qdisc show) produce the following
output:

[ {
        "kind": "taprio",
        "handle": "8001:",
        "root": true,
        "refcnt": 9,
        "options": {
            "tc": 8,
            "map": [ 0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0 ],
            "queues": [ {
                    "offset": 0,
                    "count": 1
                },{
                    "offset": 1,
                    "count": 1
                },{
                    "offset": 2,
                    "count": 1
                },{
                    "offset": 3,
                    "count": 1
                },{
                    "offset": 4,
                    "count": 1
                },{
                    "offset": 5,
                    "count": 1
                },{
                    "offset": 6,
                    "count": 1
                },{
                    "offset": 7,
                    "count": 1
                } ],
            "clockid": "TAI",
            "base_time": 0,
            "cycle_time": 20000000,
            "cycle_time_extension": 0,
            "schedule": [ {
                    "index": 0,
                    "cmd": "S",
                    "gatemask": "0xff",
                    "interval": 20000000
                } ],{
                "base_time": 1691160103110424418,
                "cycle_time": 20000000,
                "cycle_time_extension": 0,
                "schedule": [ {
                        "index": 0,
                        "cmd": "S",
                        "gatemask": "0xff",
                        "interval": 20000000
                    } ]
            },
            "max-sdu": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ],
            "fp": [ "E","E","E","E","E","E","E","E","E","E","E","E","E","E","E","E" ]
        }
    } ]

which is invalid json, because the second group of "base_time",
"cycle_time", etc etc is placed in an unlabeled sub-object. If we pipe
it into jq, it complains:

parse error: Objects must consist of key:value pairs at line 53, column 14

Since it represents the administrative schedule, give this unnamed JSON
object the "admin" name. We now print valid JSON which looks like this:

[ {
        "kind": "taprio",
        "handle": "8001:",
        "root": true,
        "refcnt": 9,
        "options": {
            "tc": 8,
            "map": [ 0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0 ],
            "queues": [ {
                    "offset": 0,
                    "count": 1
                },{
                    "offset": 1,
                    "count": 1
                },{
                    "offset": 2,
                    "count": 1
                },{
                    "offset": 3,
                    "count": 1
                },{
                    "offset": 4,
                    "count": 1
                },{
                    "offset": 5,
                    "count": 1
                },{
                    "offset": 6,
                    "count": 1
                },{
                    "offset": 7,
                    "count": 1
                } ],
            "clockid": "TAI",
            "base_time": 0,
            "cycle_time": 20000000,
            "cycle_time_extension": 0,
            "schedule": [ {
                    "index": 0,
                    "cmd": "S",
                    "gatemask": "0xff",
                    "interval": 20000000
                } ],
            "admin": {
                "base_time": 1691160511783528178,
                "cycle_time": 20000000,
                "cycle_time_extension": 0,
                "schedule": [ {
                        "index": 0,
                        "cmd": "S",
                        "gatemask": "0xff",
                        "interval": 20000000
                    } ]
            },
            "max-sdu": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ],
            "fp": [ "E","E","E","E","E","E","E","E","E","E","E","E","E","E","E","E" ]
        }
    } ]

Fixes: 602fae856d80 ("taprio: Add support for changing schedules")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 tc/q_taprio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tc/q_taprio.c b/tc/q_taprio.c
index 795c013c1c2a..16a4992d70d2 100644
--- a/tc/q_taprio.c
+++ b/tc/q_taprio.c
@@ -650,7 +650,7 @@ static int taprio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 		parse_rtattr_nested(t, TCA_TAPRIO_ATTR_MAX,
 				    tb[TCA_TAPRIO_ATTR_ADMIN_SCHED]);
 
-		open_json_object(NULL);
+		open_json_object("admin");
 
 		print_schedule(f, t);
 
-- 
2.34.1