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 <pab...@redhat.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, <pab...@redhat.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
