From df1c7d9138eafd5b96e81040b0c1475b6d73d158 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 11 May 2015 10:44:55 -0700 Subject: codel: add ce_threshold support to codel & fc_codel codel & fq_codel packet schedulers are now able to have a threshold for CE marking packets, regardless of the drop/nodrop decision taken by CoDel. This is particularly useful for dctcp and variants, that do not use traditional ECN. Note that fq_codel users would have to specify noecn if ce_threshold is used, otherwise results would be not very interesting, as ecn is default on for fq_codel. $ tc -s qdisc show dev eth1 qdisc codel 8002: root refcnt 45 limit 1000p target 5.0ms ce_threshold 1.0ms interval 100.0ms Sent 4908469888317 bytes 3351813967 pkt (dropped 0, overlimits 0 requeues 21624365) rate 37671Mbit 3231836pps backlog 4904740b 250p requeues 21624365 count 0 lastcount 0 ldelay 1.1ms drop_next 0us maxpacket 68130 ecn_mark 0 drop_overlimit 0 ce_mark 410861803 Signed-off-by: Eric Dumazet --- tc/q_fq_codel.c | 31 ++++++++++++++++++++++++++----- 1 file changed, 26 insertions(+), 5 deletions(-) (limited to 'tc/q_fq_codel.c') diff --git a/tc/q_fq_codel.c b/tc/q_fq_codel.c index 1d3bfa2a..4f747ebd 100644 --- a/tc/q_fq_codel.c +++ b/tc/q_fq_codel.c @@ -1,7 +1,7 @@ /* * Fair Queue Codel * - * Copyright (C) 2012 Eric Dumazet + * 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 @@ -53,6 +53,7 @@ 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"); + fprintf(stderr, " [ ce_threshold TIME ]\n"); } static int fq_codel_parse_opt(struct qdisc_util *qu, int argc, char **argv, @@ -63,6 +64,7 @@ static int fq_codel_parse_opt(struct qdisc_util *qu, int argc, char **argv, unsigned target = 0; unsigned interval = 0; unsigned quantum = 0; + unsigned ce_threshold = ~0U; int ecn = -1; struct rtattr *tail; @@ -91,6 +93,12 @@ static int fq_codel_parse_opt(struct qdisc_util *qu, int argc, char **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)) { @@ -126,6 +134,9 @@ static int fq_codel_parse_opt(struct qdisc_util *qu, int argc, char **argv, 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)); + if (ce_threshold != ~0U) + addattr_l(n, 1024, TCA_FQ_CODEL_CE_THRESHOLD, + &ce_threshold, sizeof(ce_threshold)); tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; return 0; } @@ -139,6 +150,7 @@ static int fq_codel_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt unsigned target; unsigned ecn; unsigned quantum; + unsigned ce_threshold; SPRINT_BUF(b1); if (opt == NULL) @@ -166,6 +178,11 @@ static int fq_codel_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt target = rta_getattr_u32(tb[TCA_FQ_CODEL_TARGET]); fprintf(f, "target %s ", sprint_time(target, b1)); } + if (tb[TCA_FQ_CODEL_CE_THRESHOLD] && + RTA_PAYLOAD(tb[TCA_FQ_CODEL_CE_THRESHOLD]) >= sizeof(__u32)) { + ce_threshold = rta_getattr_u32(tb[TCA_FQ_CODEL_CE_THRESHOLD]); + fprintf(f, "ce_threshold %s ", sprint_time(ce_threshold, 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]); @@ -184,22 +201,26 @@ static int fq_codel_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt static int fq_codel_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats) { - struct tc_fq_codel_xstats *st; + struct tc_fq_codel_xstats _st, *st; SPRINT_BUF(b1); if (xstats == NULL) return 0; - if (RTA_PAYLOAD(xstats) < sizeof(*st)) - return -1; - st = RTA_DATA(xstats); + if (RTA_PAYLOAD(xstats) < sizeof(*st)) { + memset(&_st, 0, sizeof(_st)); + memcpy(&_st, st, RTA_PAYLOAD(xstats)); + st = &_st; + } 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); + if (st->qdisc_stats.ce_mark) + fprintf(f, " ce_mark %u", st->qdisc_stats.ce_mark); fprintf(f, "\n new_flows_len %u old_flows_len %u", st->qdisc_stats.new_flows_len, st->qdisc_stats.old_flows_len); -- cgit v1.2.3