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pkt_sched: fq: Fair Queue packet scheduler
Support for FQ packet scheduler
$ tc qd add dev eth0 root fq help
Usage: ... fq [ limit PACKETS ] [ flow_limit PACKETS ]
[ quantum BYTES ] [ initial_quantum BYTES ]
[ maxrate RATE ] [ buckets NUMBER ]
[ [no]pacing ]
$ tc -s -d qd
qdisc fq 8002: dev eth0 root refcnt 32 limit 10000p flow_limit 100p
buckets 256 quantum 3028 initial_quantum 15140
Sent 216532416 bytes 148395 pkt (dropped 0, overlimits 0 requeues 14)
backlog 0b 0p requeues 14
511 flows (511 inactive, 0 throttled)
110 gc, 0 highprio, 0 retrans, 1143 throttled, 0 flows_plimit
limit : max number of packets on whole Qdisc (default 10000)
flow_limit : max number of packets per flow (default 100)
quantum : the max deficit per RR round (default is 2 MTU)
initial_quantum : initial credit for new flows (default is 10 MTU)
maxrate : max per flow rate (default : unlimited)
buckets : number of RB trees (default : 1024) in hash table.
(consumes 8 bytes per bucket)
[no]pacing : disable/enable pacing (default is enable)
Usage :
tc qdisc add dev $ETH root fq
tc qdisc del dev $ETH root 2>/dev/null
tc qdisc add dev $ETH root handle 1: mq
for i in `seq 1 4`
do
tc qdisc add dev $ETH parent 1:$i est 1sec 4sec fq
done
Signed-off-by: Eric Dumazet <edumazet@google.com>
This commit is contained in:
Eric Dumazet
Stephen Hemminger
parent
c92716d1ed
commit
bc113e46a3
@ -50,6 +50,7 @@ TCMODULES += em_meta.o
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TCMODULES += q_mqprio.o
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TCMODULES += q_codel.o
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TCMODULES += q_fq_codel.o
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TCMODULES += q_fq.o
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ifeq ($(TC_CONFIG_IPSET), y)
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ifeq ($(TC_CONFIG_XT), y)
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279
tc/q_fq.c
Normal file
279
tc/q_fq.c
Normal file
@ -0,0 +1,279 @@
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/*
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* Fair Queue
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*
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* Copyright (C) 2013 Eric Dumazet <edumazet@google.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, provided that this notice is retained in full, this
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* software may be distributed under the terms of the GNU General
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* Public License ("GPL") version 2, in which case the provisions of the
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* GPL apply INSTEAD OF those given above.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include "utils.h"
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#include "tc_util.h"
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static void explain(void)
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{
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fprintf(stderr, "Usage: ... fq [ limit PACKETS ] [ flow_limit PACKETS ]\n");
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fprintf(stderr, " [ quantum BYTES ] [ initial_quantum BYTES ]\n");
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fprintf(stderr, " [ maxrate RATE ] [ buckets NUMBER ]\n");
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fprintf(stderr, " [ [no]pacing ]\n");
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}
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static unsigned int ilog2(unsigned int val)
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{
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unsigned int res = 0;
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val--;
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while (val) {
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res++;
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val >>= 1;
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}
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return res;
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}
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static int fq_parse_opt(struct qdisc_util *qu, int argc, char **argv,
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struct nlmsghdr *n)
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{
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unsigned int plimit = ~0U;
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unsigned int flow_plimit = ~0U;
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unsigned int quantum = ~0U;
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unsigned int initial_quantum = ~0U;
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unsigned int buckets = 0;
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unsigned int maxrate = ~0U;
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unsigned int defrate = ~0U;
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int pacing = -1;
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struct rtattr *tail;
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while (argc > 0) {
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if (strcmp(*argv, "limit") == 0) {
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NEXT_ARG();
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if (get_unsigned(&plimit, *argv, 0)) {
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fprintf(stderr, "Illegal \"limit\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "flow_limit") == 0) {
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NEXT_ARG();
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if (get_unsigned(&flow_plimit, *argv, 0)) {
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fprintf(stderr, "Illegal \"flow_limit\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "buckets") == 0) {
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NEXT_ARG();
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if (get_unsigned(&buckets, *argv, 0)) {
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fprintf(stderr, "Illegal \"buckets\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "maxrate") == 0) {
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NEXT_ARG();
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if (get_rate(&maxrate, *argv)) {
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fprintf(stderr, "Illegal \"maxrate\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "defrate") == 0) {
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NEXT_ARG();
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if (get_rate(&defrate, *argv)) {
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fprintf(stderr, "Illegal \"defrate\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "quantum") == 0) {
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NEXT_ARG();
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if (get_unsigned(&quantum, *argv, 0)) {
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fprintf(stderr, "Illegal \"quantum\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "initial_quantum") == 0) {
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NEXT_ARG();
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if (get_unsigned(&initial_quantum, *argv, 0)) {
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fprintf(stderr, "Illegal \"initial_quantum\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "pacing") == 0) {
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pacing = 1;
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} else if (strcmp(*argv, "nopacing") == 0) {
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pacing = 0;
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} else if (strcmp(*argv, "help") == 0) {
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explain();
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return -1;
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} else {
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fprintf(stderr, "What is \"%s\"?\n", *argv);
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explain();
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return -1;
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}
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argc--; argv++;
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}
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tail = NLMSG_TAIL(n);
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addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
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if (buckets) {
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unsigned int log = ilog2(buckets);
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addattr_l(n, 1024, TCA_FQ_BUCKETS_LOG,
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&log, sizeof(log));
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}
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if (plimit != ~0U)
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addattr_l(n, 1024, TCA_FQ_PLIMIT,
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&plimit, sizeof(plimit));
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if (flow_plimit != ~0U)
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addattr_l(n, 1024, TCA_FQ_FLOW_PLIMIT,
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&flow_plimit, sizeof(flow_plimit));
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if (quantum != ~0U)
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addattr_l(n, 1024, TCA_FQ_QUANTUM, &quantum, sizeof(quantum));
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if (initial_quantum != ~0U)
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addattr_l(n, 1024, TCA_FQ_INITIAL_QUANTUM,
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&initial_quantum, sizeof(initial_quantum));
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if (pacing != -1)
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addattr_l(n, 1024, TCA_FQ_RATE_ENABLE,
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&pacing, sizeof(pacing));
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if (maxrate != ~0U)
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addattr_l(n, 1024, TCA_FQ_FLOW_MAX_RATE,
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&maxrate, sizeof(maxrate));
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if (defrate != ~0U)
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addattr_l(n, 1024, TCA_FQ_FLOW_DEFAULT_RATE,
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&defrate, sizeof(defrate));
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tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
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return 0;
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}
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static int fq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
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{
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struct rtattr *tb[TCA_FQ_MAX + 1];
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unsigned int plimit, flow_plimit;
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unsigned int buckets_log;
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int pacing;
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unsigned int rate, quantum;
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SPRINT_BUF(b1);
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if (opt == NULL)
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return 0;
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parse_rtattr_nested(tb, TCA_FQ_MAX, opt);
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if (tb[TCA_FQ_PLIMIT] &&
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RTA_PAYLOAD(tb[TCA_FQ_PLIMIT]) >= sizeof(__u32)) {
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plimit = rta_getattr_u32(tb[TCA_FQ_PLIMIT]);
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fprintf(f, "limit %up ", plimit);
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}
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if (tb[TCA_FQ_FLOW_PLIMIT] &&
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RTA_PAYLOAD(tb[TCA_FQ_FLOW_PLIMIT]) >= sizeof(__u32)) {
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flow_plimit = rta_getattr_u32(tb[TCA_FQ_FLOW_PLIMIT]);
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fprintf(f, "flow_limit %up ", flow_plimit);
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}
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if (tb[TCA_FQ_BUCKETS_LOG] &&
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RTA_PAYLOAD(tb[TCA_FQ_BUCKETS_LOG]) >= sizeof(__u32)) {
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buckets_log = rta_getattr_u32(tb[TCA_FQ_BUCKETS_LOG]);
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fprintf(f, "buckets %u ", 1U << buckets_log);
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}
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if (tb[TCA_FQ_RATE_ENABLE] &&
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RTA_PAYLOAD(tb[TCA_FQ_RATE_ENABLE]) >= sizeof(int)) {
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pacing = rta_getattr_u32(tb[TCA_FQ_RATE_ENABLE]);
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if (pacing == 0)
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fprintf(f, "nopacing ");
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}
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if (tb[TCA_FQ_QUANTUM] &&
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RTA_PAYLOAD(tb[TCA_FQ_QUANTUM]) >= sizeof(__u32)) {
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quantum = rta_getattr_u32(tb[TCA_FQ_QUANTUM]);
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fprintf(f, "quantum %u ", quantum);
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}
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if (tb[TCA_FQ_INITIAL_QUANTUM] &&
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RTA_PAYLOAD(tb[TCA_FQ_INITIAL_QUANTUM]) >= sizeof(__u32)) {
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quantum = rta_getattr_u32(tb[TCA_FQ_INITIAL_QUANTUM]);
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fprintf(f, "initial_quantum %u ", quantum);
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}
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if (tb[TCA_FQ_FLOW_MAX_RATE] &&
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RTA_PAYLOAD(tb[TCA_FQ_FLOW_MAX_RATE]) >= sizeof(__u32)) {
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rate = rta_getattr_u32(tb[TCA_FQ_FLOW_MAX_RATE]);
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if (rate != ~0U)
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fprintf(f, "maxrate %s ", sprint_rate(rate, b1));
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}
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if (tb[TCA_FQ_FLOW_DEFAULT_RATE] &&
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RTA_PAYLOAD(tb[TCA_FQ_FLOW_DEFAULT_RATE]) >= sizeof(__u32)) {
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rate = rta_getattr_u32(tb[TCA_FQ_FLOW_DEFAULT_RATE]);
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if (rate != 0)
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fprintf(f, "defrate %s ", sprint_rate(rate, b1));
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}
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return 0;
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}
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static int fq_print_xstats(struct qdisc_util *qu, FILE *f,
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struct rtattr *xstats)
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{
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struct tc_fq_qd_stats *st;
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if (xstats == NULL)
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return 0;
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if (RTA_PAYLOAD(xstats) < sizeof(*st))
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return -1;
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st = RTA_DATA(xstats);
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fprintf(f, " %u flows (%u inactive, %u throttled)",
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st->flows, st->inactive_flows, st->throttled_flows);
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if (st->time_next_delayed_flow > 0)
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fprintf(f, ", next packet delay %llu ns", st->time_next_delayed_flow);
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fprintf(f, "\n %llu gc, %llu highprio",
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st->gc_flows, st->highprio_packets);
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if (st->tcp_retrans)
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fprintf(f, ", %llu retrans", st->tcp_retrans);
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fprintf(f, ", %llu throttled", st->throttled);
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if (st->flows_plimit)
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fprintf(f, ", %llu flows_plimit", st->flows_plimit);
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if (st->pkts_too_long || st->allocation_errors)
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fprintf(f, "\n %llu too long pkts, %llu alloc errors\n",
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st->pkts_too_long, st->allocation_errors);
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return 0;
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}
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struct qdisc_util fq_qdisc_util = {
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.id = "fq",
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.parse_qopt = fq_parse_opt,
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.print_qopt = fq_print_opt,
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.print_xstats = fq_print_xstats,
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};
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