From c3524efc14e3112329a18bc699dd99437fae9a5c Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 11 May 2012 09:49:50 +0000 Subject: [PATCH] fq_codel: Fair Queue Codel AQM MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Fair Queue Codel packet scheduler Principles : - Packets are classified (internal classifier or external) on flows. - This is a Stochastic model (as we use a hash, several flows might be hashed on same slot) - Each flow has a CoDel managed queue. - Flows are linked onto two (Round Robin) lists, so that new flows have priority on old ones. - For a given flow, packets are not reordered (CoDel uses a FIFO) - head drops only. - ECN capability is on by default. - Very low memory footprint (64 bytes per flow) tc qdisc ... fq_codel [ limit PACKETS ] [ flows number ] [ target TIME ] [ interval TIME ] [ noecn ] [ quantum BYTES ] Signed-off-by: Eric Dumazet Cc: Dave Taht Cc: Kathleen Nichols Cc: Van Jacobson Cc: Tom Herbert Cc: Matt Mathis Cc: Nandita Dukkipati Cc: Maciej Żenczykowski Cc: Yuchung Cheng Cc: Stephen Hemminger Cc: Changli Gao --- tc/Makefile | 1 + tc/q_fq_codel.c | 232 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 233 insertions(+) create mode 100644 tc/q_fq_codel.c diff --git a/tc/Makefile b/tc/Makefile index 8a7cc8d..64d93ad 100644 --- a/tc/Makefile +++ b/tc/Makefile @@ -48,6 +48,7 @@ TCMODULES += em_u32.o TCMODULES += em_meta.o TCMODULES += q_mqprio.o TCMODULES += q_codel.o +TCMODULES += q_fq_codel.o TCSO := ifeq ($(TC_CONFIG_ATM),y) diff --git a/tc/q_fq_codel.c b/tc/q_fq_codel.c new file mode 100644 index 0000000..1d3bfa2 --- /dev/null +++ b/tc/q_fq_codel.c @@ -0,0 +1,232 @@ +/* + * Fair Queue Codel + * + * Copyright (C) 2012 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: ... fq_codel [ limit PACKETS ] [ flows NUMBER ]\n"); + fprintf(stderr, " [ target TIME] [ interval TIME ]\n"); + fprintf(stderr, " [ quantum BYTES ] [ [no]ecn ]\n"); +} + +static int fq_codel_parse_opt(struct qdisc_util *qu, int argc, char **argv, + struct nlmsghdr *n) +{ + unsigned limit = 0; + unsigned flows = 0; + unsigned target = 0; + unsigned interval = 0; + unsigned quantum = 0; + 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, "flows") == 0) { + NEXT_ARG(); + if (get_unsigned(&flows, *argv, 0)) { + fprintf(stderr, "Illegal \"flows\"\n"); + return -1; + } + } else if (strcmp(*argv, "quantum") == 0) { + NEXT_ARG(); + if (get_unsigned(&quantum, *argv, 0)) { + fprintf(stderr, "Illegal \"quantum\"\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, "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_FQ_CODEL_LIMIT, &limit, sizeof(limit)); + if (flows) + addattr_l(n, 1024, TCA_FQ_CODEL_FLOWS, &flows, sizeof(flows)); + if (quantum) + addattr_l(n, 1024, TCA_FQ_CODEL_QUANTUM, &quantum, sizeof(quantum)); + if (interval) + addattr_l(n, 1024, TCA_FQ_CODEL_INTERVAL, &interval, sizeof(interval)); + if (target) + addattr_l(n, 1024, TCA_FQ_CODEL_TARGET, &target, sizeof(target)); + if (ecn != -1) + addattr_l(n, 1024, TCA_FQ_CODEL_ECN, &ecn, sizeof(ecn)); + tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; + return 0; +} + +static int fq_codel_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt) +{ + struct rtattr *tb[TCA_FQ_CODEL_MAX + 1]; + unsigned limit; + unsigned flows; + unsigned interval; + unsigned target; + unsigned ecn; + unsigned quantum; + SPRINT_BUF(b1); + + if (opt == NULL) + return 0; + + parse_rtattr_nested(tb, TCA_FQ_CODEL_MAX, opt); + + if (tb[TCA_FQ_CODEL_LIMIT] && + RTA_PAYLOAD(tb[TCA_FQ_CODEL_LIMIT]) >= sizeof(__u32)) { + limit = rta_getattr_u32(tb[TCA_FQ_CODEL_LIMIT]); + fprintf(f, "limit %up ", limit); + } + if (tb[TCA_FQ_CODEL_FLOWS] && + RTA_PAYLOAD(tb[TCA_FQ_CODEL_FLOWS]) >= sizeof(__u32)) { + flows = rta_getattr_u32(tb[TCA_FQ_CODEL_FLOWS]); + fprintf(f, "flows %u ", flows); + } + if (tb[TCA_FQ_CODEL_QUANTUM] && + RTA_PAYLOAD(tb[TCA_FQ_CODEL_QUANTUM]) >= sizeof(__u32)) { + quantum = rta_getattr_u32(tb[TCA_FQ_CODEL_QUANTUM]); + fprintf(f, "quantum %u ", quantum); + } + if (tb[TCA_FQ_CODEL_TARGET] && + RTA_PAYLOAD(tb[TCA_FQ_CODEL_TARGET]) >= sizeof(__u32)) { + target = rta_getattr_u32(tb[TCA_FQ_CODEL_TARGET]); + fprintf(f, "target %s ", sprint_time(target, b1)); + } + if (tb[TCA_FQ_CODEL_INTERVAL] && + RTA_PAYLOAD(tb[TCA_FQ_CODEL_INTERVAL]) >= sizeof(__u32)) { + interval = rta_getattr_u32(tb[TCA_FQ_CODEL_INTERVAL]); + fprintf(f, "interval %s ", sprint_time(interval, b1)); + } + if (tb[TCA_FQ_CODEL_ECN] && + RTA_PAYLOAD(tb[TCA_FQ_CODEL_ECN]) >= sizeof(__u32)) { + ecn = rta_getattr_u32(tb[TCA_FQ_CODEL_ECN]); + if (ecn) + fprintf(f, "ecn "); + } + + return 0; +} + +static int fq_codel_print_xstats(struct qdisc_util *qu, FILE *f, + struct rtattr *xstats) +{ + struct tc_fq_codel_xstats *st; + SPRINT_BUF(b1); + + if (xstats == NULL) + return 0; + + if (RTA_PAYLOAD(xstats) < sizeof(*st)) + return -1; + + st = RTA_DATA(xstats); + if (st->type == TCA_FQ_CODEL_XSTATS_QDISC) { + fprintf(f, " maxpacket %u drop_overlimit %u new_flow_count %u ecn_mark %u", + st->qdisc_stats.maxpacket, + st->qdisc_stats.drop_overlimit, + st->qdisc_stats.new_flow_count, + st->qdisc_stats.ecn_mark); + fprintf(f, "\n new_flows_len %u old_flows_len %u", + st->qdisc_stats.new_flows_len, + st->qdisc_stats.old_flows_len); + } + if (st->type == TCA_FQ_CODEL_XSTATS_CLASS) { + fprintf(f, " deficit %d count %u lastcount %u ldelay %s", + st->class_stats.deficit, + st->class_stats.count, + st->class_stats.lastcount, + sprint_time(st->class_stats.ldelay, b1)); + if (st->class_stats.dropping) { + fprintf(f, " dropping"); + if (st->class_stats.drop_next < 0) + fprintf(f, " drop_next -%s", + sprint_time(-st->class_stats.drop_next, b1)); + else + fprintf(f, " drop_next %s", + sprint_time(st->class_stats.drop_next, b1)); + } + } + return 0; + +} + +struct qdisc_util fq_codel_qdisc_util = { + .id = "fq_codel", + .parse_qopt = fq_codel_parse_opt, + .print_qopt = fq_codel_print_opt, + .print_xstats = fq_codel_print_xstats, +}; -- 2.39.2