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tc: add support for plug qdisc

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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.

v1 -> v2:
 - use the SPDX identifier

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Paolo Abeni 2019-04-30 18:53:57 +02:00 committed by David Ahern
parent fd6580972b
commit c865c52365
2 changed files with 77 additions and 0 deletions
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1
tc/Makefile
View File

@ -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)

76
tc/q_plug.c Normal file
View File

@ -0,0 +1,76 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* q_log.c plug scheduler
*
* Copyright (C) 2019 Paolo Abeni <pabeni@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,
};