diff options
Diffstat (limited to 'tc/q_codel.c')
| -rw-r--r-- | tc/q_codel.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/tc/q_codel.c b/tc/q_codel.c new file mode 100644 index 0000000..03b6f92 --- /dev/null +++ b/tc/q_codel.c @@ -0,0 +1,200 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +/* + * 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> + */ + +#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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