netdev - [PATCH iproute2-next] tc: add support for plug qdisc

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Date:   Wed, 24 Apr 2019 18:29:39 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     stephen@...workplumber.org
Cc:     netdev@...r.kernel.org
Subject: [PATCH iproute2-next] tc: add support for plug qdisc

sch_plug can be used to perform functional qdisc unit tests
controlling explicitly the queuing behaviour from user-space.

Plug support lacks since its introduction in 2012. This change
introduces basic support, to control the tc status.

Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
 tc/Makefile |  1 +
 tc/q_plug.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 tc/q_plug.c

diff --git a/tc/Makefile b/tc/Makefile
index 2edaf2c8..1a305cf4 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -75,6 +75,7 @@ TCMODULES += f_matchall.o
 TCMODULES += q_cbs.o
 TCMODULES += q_etf.o
 TCMODULES += q_taprio.o
+TCMODULES += q_plug.o
 
 TCSO :=
 ifeq ($(TC_CONFIG_ATM),y)
diff --git a/tc/q_plug.c b/tc/q_plug.c
new file mode 100644
index 00000000..53d977b1
--- /dev/null
+++ b/tc/q_plug.c
@@ -0,0 +1,81 @@
+/*
+ * q_log.c		plug scheduler
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Authors:	Paolo Abeni, <pabeni@...hat.com>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include "utils.h"
+#include "tc_util.h"
+
+static void explain(void)
+{
+	fprintf(stderr, "Usage: ... plug [block | release | release_indefinite | limit NUMBER]\n");
+}
+
+static int plug_parse_opt(struct qdisc_util *qu, int argc, char **argv,
+			  struct nlmsghdr *n, const char *dev)
+{
+	struct tc_plug_qopt opt = {};
+	int ok = 0;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "block") == 0) {
+			opt.action = TCQ_PLUG_BUFFER;
+			ok++;
+		} else if (strcmp(*argv, "release") == 0) {
+			opt.action = TCQ_PLUG_RELEASE_ONE;
+			ok++;
+		} else if (strcmp(*argv, "release_indefinite") == 0) {
+			opt.action = TCQ_PLUG_RELEASE_INDEFINITE;
+			ok++;
+		} else if (strcmp(*argv, "limit") == 0) {
+			opt.action = TCQ_PLUG_LIMIT;
+			NEXT_ARG();
+			if (get_size(&opt.limit, *argv)) {
+				fprintf(stderr, "Illegal value for \"limit\": \"%s\"\n", *argv);
+				return -1;
+			}
+			ok++;
+		} else if (strcmp(*argv, "help") == 0) {
+			explain();
+			return -1;
+		} else {
+			fprintf(stderr, "%s: unknown parameter \"%s\"\n", qu->id, *argv);
+			explain();
+			return -1;
+		}
+		argc--; argv++;
+	}
+
+	if (ok)
+		addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
+	return 0;
+}
+
+static int plug_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+	/* dummy implementation as sch_plug does not implement a dump op */
+	return 0;
+}
+
+
+struct qdisc_util plug_qdisc_util = {
+	.id = "plug",
+	.parse_qopt = plug_parse_opt,
+	.print_qopt = plug_print_opt,
+};
-- 
2.20.1