/* * Codel - The Controlled-Delay Active Queue Management algorithm * * Copyright (C) 2011-2012 Kathleen Nichols * Copyright (C) 2011-2012 Van Jacobson * Copyright (C) 2012 Michael D. Taht * Copyright (C) 2012,2015 Eric Dumazet * * 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 #include #include #include #include #include #include #include #include #include "utils.h" #include "tc_util.h" static void explain(void) { fprintf(stderr, "Usage: ... codel [ limit PACKETS ] [ target TIME ]\n"); fprintf(stderr, " [ interval TIME ] [ ecn | noecn ]\n"); fprintf(stderr, " [ ce_threshold TIME ]\n"); } static int codel_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n) { 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 = NLMSG_TAIL(n); addattr_l(n, 1024, TCA_OPTIONS, NULL, 0); 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)); tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) 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]); fprintf(f, "limit %up ", limit); } if (tb[TCA_CODEL_TARGET] && RTA_PAYLOAD(tb[TCA_CODEL_TARGET]) >= sizeof(__u32)) { target = rta_getattr_u32(tb[TCA_CODEL_TARGET]); fprintf(f, "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]); fprintf(f, "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]); fprintf(f, "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) fprintf(f, "ecn "); } 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; } fprintf(f, " count %u lastcount %u ldelay %s", st->count, st->lastcount, sprint_time(st->ldelay, b1)); if (st->dropping) fprintf(f, " dropping"); if (st->drop_next < 0) fprintf(f, " drop_next -%s", sprint_time(-st->drop_next, b1)); else fprintf(f, " drop_next %s", sprint_time(st->drop_next, b1)); fprintf(f, "\n maxpacket %u ecn_mark %u drop_overlimit %u", st->maxpacket, st->ecn_mark, st->drop_overlimit); if (st->ce_mark) fprintf(f, " 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, };