netdev - [PATCH v2 iproute2-next 23/31] tc/gred: implement JSON output

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Date:   Tue, 10 Jul 2018 14:05:50 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     netdev@...r.kernel.org
Cc:     Stephen Hemminger <sthemmin@...rosoft.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: [PATCH v2 iproute2-next 23/31] tc/gred: implement JSON output

From: Stephen Hemminger <sthemmin@...rosoft.com>

Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
---
 tc/q_gred.c | 73 ++++++++++++++++++++++++++++-------------------------
 1 file changed, 38 insertions(+), 35 deletions(-)

diff --git a/tc/q_gred.c b/tc/q_gred.c
index e63fac72a883..957d3c0950f1 100644
--- a/tc/q_gred.c
+++ b/tc/q_gred.c
@@ -274,10 +274,6 @@ static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 	__u32 *limit = NULL;
 	unsigned int i;
 
-	SPRINT_BUF(b1);
-	SPRINT_BUF(b2);
-	SPRINT_BUF(b3);
-
 	if (opt == NULL)
 		return 0;
 
@@ -298,49 +294,56 @@ static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 	qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
 	if (RTA_PAYLOAD(tb[TCA_GRED_DPS]) < sizeof(*sopt) ||
 	    RTA_PAYLOAD(tb[TCA_GRED_PARMS]) < sizeof(*qopt)*MAX_DPs) {
-		fprintf(f, "\n GRED received message smaller than expected\n");
+		fprintf(stderr, "\n GRED received message smaller than expected\n");
 		return -1;
 	}
 
-/* Bad hack! should really return a proper message as shown above*/
-
-	fprintf(f, "vqs %u default %u %s",
-		sopt->DPs,
-		sopt->def_DP,
-		sopt->grio ? "grio " : "");
+	/* Bad hack! should really return a proper message as shown above*/
+	print_uint(PRINT_ANY, "num_dp", "vqs %u", sopt->DPs);
+	print_uint(PRINT_ANY, "default", " default %u", sopt->def_DP);
+	if (sopt->grio)
+		print_null(PRINT_ANY, "grio", "grio ", NULL);
 
 	if (limit)
-		fprintf(f, "limit %s ",
-			sprint_size(*limit, b1));
+		print_size("limit", "limit %s ", *limit);
 
+	open_json_array(PRINT_JSON, "dp");
 	for (i = 0; i < MAX_DPs; i++, qopt++) {
-		if (qopt->DP >= MAX_DPs) continue;
-		fprintf(f, "\n vq %u prio %hhu limit %s min %s max %s ",
-			qopt->DP,
-			qopt->prio,
-			sprint_size(qopt->limit, b1),
-			sprint_size(qopt->qth_min, b2),
-			sprint_size(qopt->qth_max, b3));
+		if (qopt->DP >= MAX_DPs)
+			continue;
+		print_string(PRINT_FP, NULL, "%s", _SL_);
+		open_json_object(NULL);
+		print_uint(PRINT_ANY, "vq", "vq %u ", qopt->DP);
+		print_uint(PRINT_ANY, "prio", "prio %u ", qopt->prio);
+		print_size("limit", "limit %s ", qopt->limit);
+		print_size("min", "min %s ", qopt->qth_min);
+		print_size("max", "min %s ", qopt->qth_max);
+
 		if (show_details) {
-			fprintf(f, "ewma %u ", qopt->Wlog);
+			print_uint(PRINT_ANY, "ewma", "ewma %u ", qopt->Wlog);
 			if (max_p)
-				fprintf(f, "probability %lg ", max_p[i] / pow(2, 32));
+				print_float(PRINT_ANY, "probability",
+					    "probability %lg ", max_p[i] / pow(2, 32));
 			else
-				fprintf(f, "Plog %u ", qopt->Plog);
-			fprintf(f, "Scell_log %u ", qopt->Scell_log);
+				print_uint(PRINT_ANY, "plog",
+					   "Plog %u ", qopt->Plog);
+			print_uint(PRINT_ANY, "scell_log",
+				   "Scell_log %u ", qopt->Scell_log);
 		}
 		if (show_stats) {
-			fprintf(f, "\n  Queue size: average %s current %s ",
-				sprint_size(qopt->qave, b1),
-				sprint_size(qopt->backlog, b2));
-			fprintf(f, "\n  Dropped packets: forced %u early %u pdrop %u other %u ",
-				qopt->forced,
-				qopt->early,
-				qopt->pdrop,
-				qopt->other);
-			fprintf(f, "\n  Total packets: %u (%s) ",
-				qopt->packets,
-				sprint_size(qopt->bytesin, b1));
+			print_string(PRINT_FP, NULL, "%s", _SL_);
+			print_size("average", "  Queue size: average %s", qopt->qave);
+			print_size("backlog", " current %s ", qopt->backlog);
+
+			print_string(PRINT_FP, NULL, "%s  Dropped packets: ", _SL_);
+			print_uint(PRINT_ANY, "forced", " forced %u ", qopt->forced);
+			print_uint(PRINT_ANY, "early", "early %u ", qopt->early);
+			print_uint(PRINT_ANY, "pdrop", "pdrop %u ", qopt->pdrop);
+			print_uint(PRINT_ANY, "other", "other %u ", qopt->other);
+
+			print_string(PRINT_FP, NULL, "%s  Total ", _SL_);
+			print_uint(PRINT_ANY, "packets", "packets: %u ", qopt->packets);
+			print_size("bytes", "(%s) ", qopt->bytesin);
 		}
 	}
 	return 0;
-- 
2.18.0