tc: red: JSON-ify RED output

Make JSON output work with RED Qdiscs.  Float/double printing
helpers have to be added/uncommented to print the probability.
Since TC stats in general are not split out to a separate object
the xstats printed by this patch are not separated either.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David Ahern <dsahern@gmail.com>

include/json_print.h

@@ -64,6 +64,7 @@ _PRINT_FUNC(hu, unsigned short);
 _PRINT_FUNC(hex, unsigned int);
 _PRINT_FUNC(0xhex, unsigned int);
 _PRINT_FUNC(lluint, unsigned long long int);
+_PRINT_FUNC(float, double);
 #undef _PRINT_FUNC
 
 #endif /* _JSON_PRINT_H_ */

lib/json_print.c

@@ -120,6 +120,7 @@ _PRINT_FUNC(int, int);
 _PRINT_FUNC(hu, unsigned short);
 _PRINT_FUNC(uint, uint64_t);
 _PRINT_FUNC(lluint, unsigned long long int);
+_PRINT_FUNC(float, double);
 #undef _PRINT_FUNC
 
 void print_color_string(enum output_type type,

lib/json_writer.c

@@ -209,12 +209,10 @@ void jsonw_float_fmt(json_writer_t *self, const char *fmt, double num)
 	jsonw_printf(self, fmt, num);
 }
 
-#ifdef notused
 void jsonw_float(json_writer_t *self, double num)
 {
 	jsonw_printf(self, "%g", num);
 }
-#endif
 
 void jsonw_hu(json_writer_t *self, unsigned short num)
 {
@@ -249,13 +247,11 @@ void jsonw_bool_field(json_writer_t *self, const char *prop, bool val)
 	jsonw_bool(self, val);
 }
 
-#ifdef notused
 void jsonw_float_field(json_writer_t *self, const char *prop, double val)
 {
 	jsonw_name(self, prop);
 	jsonw_float(self, val);
 }
-#endif
 
 void jsonw_float_field_fmt(json_writer_t *self,
 			   const char *prop,

tc/q_red.c

@@ -183,23 +183,34 @@ static int red_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 	    RTA_PAYLOAD(tb[TCA_RED_MAX_P]) >= sizeof(__u32))
 		max_P = rta_getattr_u32(tb[TCA_RED_MAX_P]);
 
-	fprintf(f, "limit %s min %s max %s ",
+	print_uint(PRINT_JSON, "limit", NULL, qopt->limit);
-		sprint_size(qopt->limit, b1),
+	print_string(PRINT_FP, NULL, "limit %s ", sprint_size(qopt->limit, b1));
-		sprint_size(qopt->qth_min, b2),
+	print_uint(PRINT_JSON, "min", NULL, qopt->qth_min);
-		sprint_size(qopt->qth_max, b3));
+	print_string(PRINT_FP, NULL, "min %s ", sprint_size(qopt->qth_min, b2));
+	print_uint(PRINT_JSON, "max", NULL, qopt->qth_max);
+	print_string(PRINT_FP, NULL, "max %s ", sprint_size(qopt->qth_max, b3));
+
 	if (qopt->flags & TC_RED_ECN)
-		fprintf(f, "ecn ");
+		print_bool(PRINT_ANY, "ecn", "ecn ", true);
-	if (qopt->flags & TC_RED_HARDDROP)
-		fprintf(f, "harddrop ");
-	if (qopt->flags & TC_RED_ADAPTATIVE)
-		fprintf(f, "adaptive ");
-	if (show_details) {
-		fprintf(f, "ewma %u ", qopt->Wlog);
-		if (max_P)
-			fprintf(f, "probability %lg ", max_P / pow(2, 32));
 	else
-			fprintf(f, "Plog %u ", qopt->Plog);
+		print_bool(PRINT_ANY, "ecn", NULL, false);
-		fprintf(f, "Scell_log %u", qopt->Scell_log);
+	if (qopt->flags & TC_RED_HARDDROP)
+		print_bool(PRINT_ANY, "harddrop", "harddrop ", true);
+	else
+		print_bool(PRINT_ANY, "harddrop", NULL, false);
+	if (qopt->flags & TC_RED_ADAPTATIVE)
+		print_bool(PRINT_ANY, "adaptive", "adaptive ", true);
+	else
+		print_bool(PRINT_ANY, "adaptive", NULL, false);
+	if (show_details) {
+		print_uint(PRINT_ANY, "ewma", "ewma %u ", qopt->Wlog);
+		if (max_P)
+			print_float(PRINT_ANY, "probability",
+				    "probability %lg ", max_P / pow(2, 32));
+		else
+			print_uint(PRINT_ANY, "Plog", "Plog %u ", qopt->Plog);
+		print_uint(PRINT_ANY, "Scell_log", "Scell_log %u",
+			   qopt->Scell_log);
 	}
 	return 0;
 }
@@ -216,10 +227,10 @@ static int red_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstat
 		return -1;
 
 	st = RTA_DATA(xstats);
-	fprintf(f, "  marked %u early %u pdrop %u other %u",
+	print_uint(PRINT_ANY, "marked", "  marked %u ", st->marked);
-		st->marked, st->early, st->pdrop, st->other);
+	print_uint(PRINT_ANY, "early", "early %u ", st->early);
-	return 0;
+	print_uint(PRINT_ANY, "pdrop", "pdrop %u ", st->pdrop);
-
+	print_uint(PRINT_ANY, "other", "other %u ", st->other);
 #endif
 	return 0;
 }