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-rw-r--r--tc/q_codel.c230
1 files changed, 230 insertions, 0 deletions
diff --git a/tc/q_codel.c b/tc/q_codel.c
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+++ b/tc/q_codel.c
@@ -0,0 +1,230 @@
+/*
+ * Codel - The Controlled-Delay Active Queue Management algorithm
+ *
+ * Copyright (C) 2011-2012 Kathleen Nichols <nichols@pollere.com>
+ * Copyright (C) 2011-2012 Van Jacobson <van@pollere.com>
+ * Copyright (C) 2012 Michael D. Taht <dave.taht@bufferbloat.net>
+ * Copyright (C) 2012,2015 Eric Dumazet <edumazet@google.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * Alternatively, provided that this notice is retained in full, this
+ * software may be distributed under the terms of the GNU General
+ * Public License ("GPL") version 2, in which case the provisions of the
+ * GPL apply INSTEAD OF those given above.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ */
+
+#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: ... codel [ limit PACKETS ] [ target TIME ]\n"
+ " [ interval TIME ] [ ecn | noecn ]\n"
+ " [ ce_threshold TIME ]\n");
+}
+
+static int codel_parse_opt(struct qdisc_util *qu, int argc, char **argv,
+ struct nlmsghdr *n, const char *dev)
+{
+ unsigned int limit = 0;
+ unsigned int target = 0;
+ unsigned int interval = 0;
+ unsigned int ce_threshold = ~0U;
+ int ecn = -1;
+ struct rtattr *tail;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "limit") == 0) {
+ NEXT_ARG();
+ if (get_unsigned(&limit, *argv, 0)) {
+ fprintf(stderr, "Illegal \"limit\"\n");
+ return -1;
+ }
+ } else if (strcmp(*argv, "target") == 0) {
+ NEXT_ARG();
+ if (get_time(&target, *argv)) {
+ fprintf(stderr, "Illegal \"target\"\n");
+ return -1;
+ }
+ } else if (strcmp(*argv, "ce_threshold") == 0) {
+ NEXT_ARG();
+ if (get_time(&ce_threshold, *argv)) {
+ fprintf(stderr, "Illegal \"ce_threshold\"\n");
+ return -1;
+ }
+ } else if (strcmp(*argv, "interval") == 0) {
+ NEXT_ARG();
+ if (get_time(&interval, *argv)) {
+ fprintf(stderr, "Illegal \"interval\"\n");
+ return -1;
+ }
+ } else if (strcmp(*argv, "ecn") == 0) {
+ ecn = 1;
+ } else if (strcmp(*argv, "noecn") == 0) {
+ ecn = 0;
+ } else if (strcmp(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else {
+ fprintf(stderr, "What is \"%s\"?\n", *argv);
+ explain();
+ return -1;
+ }
+ argc--; argv++;
+ }
+
+ tail = addattr_nest(n, 1024, TCA_OPTIONS);
+ if (limit)
+ addattr_l(n, 1024, TCA_CODEL_LIMIT, &limit, sizeof(limit));
+ if (interval)
+ addattr_l(n, 1024, TCA_CODEL_INTERVAL, &interval, sizeof(interval));
+ if (target)
+ addattr_l(n, 1024, TCA_CODEL_TARGET, &target, sizeof(target));
+ if (ecn != -1)
+ addattr_l(n, 1024, TCA_CODEL_ECN, &ecn, sizeof(ecn));
+ if (ce_threshold != ~0U)
+ addattr_l(n, 1024, TCA_CODEL_CE_THRESHOLD,
+ &ce_threshold, sizeof(ce_threshold));
+
+ addattr_nest_end(n, tail);
+ return 0;
+}
+
+static int codel_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+ struct rtattr *tb[TCA_CODEL_MAX + 1];
+ unsigned int limit;
+ unsigned int interval;
+ unsigned int target;
+ unsigned int ecn;
+ unsigned int ce_threshold;
+
+ SPRINT_BUF(b1);
+
+ if (opt == NULL)
+ return 0;
+
+ parse_rtattr_nested(tb, TCA_CODEL_MAX, opt);
+
+ if (tb[TCA_CODEL_LIMIT] &&
+ RTA_PAYLOAD(tb[TCA_CODEL_LIMIT]) >= sizeof(__u32)) {
+ limit = rta_getattr_u32(tb[TCA_CODEL_LIMIT]);
+ print_uint(PRINT_ANY, "limit", "limit %up ", limit);
+ }
+ if (tb[TCA_CODEL_TARGET] &&
+ RTA_PAYLOAD(tb[TCA_CODEL_TARGET]) >= sizeof(__u32)) {
+ target = rta_getattr_u32(tb[TCA_CODEL_TARGET]);
+ print_uint(PRINT_JSON, "target", NULL, target);
+ print_string(PRINT_FP, NULL, "target %s ",
+ sprint_time(target, b1));
+ }
+ if (tb[TCA_CODEL_CE_THRESHOLD] &&
+ RTA_PAYLOAD(tb[TCA_CODEL_CE_THRESHOLD]) >= sizeof(__u32)) {
+ ce_threshold = rta_getattr_u32(tb[TCA_CODEL_CE_THRESHOLD]);
+ print_uint(PRINT_JSON, "ce_threshold", NULL, ce_threshold);
+ print_string(PRINT_FP, NULL, "ce_threshold %s ",
+ sprint_time(ce_threshold, b1));
+ }
+ if (tb[TCA_CODEL_INTERVAL] &&
+ RTA_PAYLOAD(tb[TCA_CODEL_INTERVAL]) >= sizeof(__u32)) {
+ interval = rta_getattr_u32(tb[TCA_CODEL_INTERVAL]);
+ print_uint(PRINT_JSON, "interval", NULL, interval);
+ print_string(PRINT_FP, NULL, "interval %s ",
+ sprint_time(interval, b1));
+ }
+ if (tb[TCA_CODEL_ECN] &&
+ RTA_PAYLOAD(tb[TCA_CODEL_ECN]) >= sizeof(__u32)) {
+ ecn = rta_getattr_u32(tb[TCA_CODEL_ECN]);
+ if (ecn)
+ print_bool(PRINT_ANY, "ecn", "ecn ", true);
+ }
+
+ return 0;
+}
+
+static int codel_print_xstats(struct qdisc_util *qu, FILE *f,
+ struct rtattr *xstats)
+{
+ struct tc_codel_xstats _st = {}, *st;
+
+ SPRINT_BUF(b1);
+
+ if (xstats == NULL)
+ return 0;
+
+ st = RTA_DATA(xstats);
+ if (RTA_PAYLOAD(xstats) < sizeof(*st)) {
+ memcpy(&_st, st, RTA_PAYLOAD(xstats));
+ st = &_st;
+ }
+
+ print_uint(PRINT_ANY, "count", " count %u", st->count);
+ print_uint(PRINT_ANY, "lastcount", " lastcount %u", st->lastcount);
+ print_uint(PRINT_JSON, "ldelay", NULL, st->ldelay);
+ print_string(PRINT_FP, NULL, " ldelay %s", sprint_time(st->ldelay, b1));
+
+ if (st->dropping)
+ print_bool(PRINT_ANY, "dropping", " dropping", true);
+
+ print_int(PRINT_JSON, "drop_next", NULL, st->drop_next);
+ if (st->drop_next < 0)
+ print_string(PRINT_FP, NULL, " drop_next -%s",
+ sprint_time(-st->drop_next, b1));
+ else
+ print_string(PRINT_FP, NULL, " drop_next %s",
+ sprint_time(st->drop_next, b1));
+
+ print_nl();
+ print_uint(PRINT_ANY, "maxpacket", " maxpacket %u", st->maxpacket);
+ print_uint(PRINT_ANY, "ecn_mark", " ecn_mark %u", st->ecn_mark);
+ print_uint(PRINT_ANY, "drop_overlimit", " drop_overlimit %u",
+ st->drop_overlimit);
+
+ if (st->ce_mark)
+ print_uint(PRINT_ANY, "ce_mark", " ce_mark %u", st->ce_mark);
+
+ return 0;
+
+}
+
+struct qdisc_util codel_qdisc_util = {
+ .id = "codel",
+ .parse_qopt = codel_parse_opt,
+ .print_qopt = codel_print_opt,
+ .print_xstats = codel_print_xstats,
+};
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