tc/q_fq_codel.c

   1 /*
   2  * Fair Queue Codel
   3  *
   4  *  Copyright (C) 2012,2015 Eric Dumazet <edumazet@google.com>
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions, and the following disclaimer,
  11  *    without modification.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The names of the authors may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * Alternatively, provided that this notice is retained in full, this
  19  * software may be distributed under the terms of the GNU General
  20  * Public License ("GPL") version 2, in which case the provisions of the
  21  * GPL apply INSTEAD OF those given above.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  29  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  30  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  33  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  34  * DAMAGE.
  35  *
  36  */
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <unistd.h>
  41 #include <fcntl.h>
  42 #include <sys/socket.h>
  43 #include <netinet/in.h>
  44 #include <arpa/inet.h>
  45 #include <string.h>
  46
  47 #include "utils.h"
  48 #include "tc_util.h"
  49
  50 static void explain(void)
  51 {
  52         fprintf(stderr, "Usage: ... fq_codel [ limit PACKETS ] [ flows NUMBER ]\n");
  53         fprintf(stderr, "                    [ target TIME ] [ interval TIME ]\n");
  54         fprintf(stderr, "                    [ quantum BYTES ] [ [no]ecn ]\n");
  55         fprintf(stderr, "                    [ ce_threshold TIME ]\n");
  56 }
  57
  58 static int fq_codel_parse_opt(struct qdisc_util *qu, int argc, char **argv,
  59                               struct nlmsghdr *n, const char *dev)
  60 {
  61         unsigned int limit = 0;
  62         unsigned int flows = 0;
  63         unsigned int target = 0;
  64         unsigned int interval = 0;
  65         unsigned int quantum = 0;
  66         unsigned int ce_threshold = ~0U;
  67         unsigned int memory = ~0U;
  68         int ecn = -1;
  69         struct rtattr *tail;
  70
  71         while (argc > 0) {
  72                 if (strcmp(*argv, "limit") == 0) {
  73                         NEXT_ARG();
  74                         if (get_unsigned(&limit, *argv, 0)) {
  75                                 fprintf(stderr, "Illegal \"limit\"\n");
  76                                 return -1;
  77                         }
  78                 } else if (strcmp(*argv, "flows") == 0) {
  79                         NEXT_ARG();
  80                         if (get_unsigned(&flows, *argv, 0)) {
  81                                 fprintf(stderr, "Illegal \"flows\"\n");
  82                                 return -1;
  83                         }
  84                 } else if (strcmp(*argv, "quantum") == 0) {
  85                         NEXT_ARG();
  86                         if (get_unsigned(&quantum, *argv, 0)) {
  87                                 fprintf(stderr, "Illegal \"quantum\"\n");
  88                                 return -1;
  89                         }
  90                 } else if (strcmp(*argv, "target") == 0) {
  91                         NEXT_ARG();
  92                         if (get_time(&target, *argv)) {
  93                                 fprintf(stderr, "Illegal \"target\"\n");
  94                                 return -1;
  95                         }
  96                 } else if (strcmp(*argv, "ce_threshold") == 0) {
  97                         NEXT_ARG();
  98                         if (get_time(&ce_threshold, *argv)) {
  99                                 fprintf(stderr, "Illegal \"ce_threshold\"\n");
 100                                 return -1;
 101                         }
 102                 } else if (strcmp(*argv, "memory_limit") == 0) {
 103                         NEXT_ARG();
 104                         if (get_size(&memory, *argv)) {
 105                                 fprintf(stderr, "Illegal \"memory_limit\"\n");
 106                                 return -1;
 107                         }
 108                 } else if (strcmp(*argv, "interval") == 0) {
 109                         NEXT_ARG();
 110                         if (get_time(&interval, *argv)) {
 111                                 fprintf(stderr, "Illegal \"interval\"\n");
 112                                 return -1;
 113                         }
 114                 } else if (strcmp(*argv, "ecn") == 0) {
 115                         ecn = 1;
 116                 } else if (strcmp(*argv, "noecn") == 0) {
 117                         ecn = 0;
 118                 } else if (strcmp(*argv, "help") == 0) {
 119                         explain();
 120                         return -1;
 121                 } else {
 122                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 123                         explain();
 124                         return -1;
 125                 }
 126                 argc--; argv++;
 127         }
 128
 129         tail = NLMSG_TAIL(n);
 130         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 131         if (limit)
 132                 addattr_l(n, 1024, TCA_FQ_CODEL_LIMIT, &limit, sizeof(limit));
 133         if (flows)
 134                 addattr_l(n, 1024, TCA_FQ_CODEL_FLOWS, &flows, sizeof(flows));
 135         if (quantum)
 136                 addattr_l(n, 1024, TCA_FQ_CODEL_QUANTUM, &quantum, sizeof(quantum));
 137         if (interval)
 138                 addattr_l(n, 1024, TCA_FQ_CODEL_INTERVAL, &interval, sizeof(interval));
 139         if (target)
 140                 addattr_l(n, 1024, TCA_FQ_CODEL_TARGET, &target, sizeof(target));
 141         if (ecn != -1)
 142                 addattr_l(n, 1024, TCA_FQ_CODEL_ECN, &ecn, sizeof(ecn));
 143         if (ce_threshold != ~0U)
 144                 addattr_l(n, 1024, TCA_FQ_CODEL_CE_THRESHOLD,
 145                           &ce_threshold, sizeof(ce_threshold));
 146         if (memory != ~0U)
 147                 addattr_l(n, 1024, TCA_FQ_CODEL_MEMORY_LIMIT,
 148                           &memory, sizeof(memory));
 149
 150         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 151         return 0;
 152 }
 153
 154 static int fq_codel_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 155 {
 156         struct rtattr *tb[TCA_FQ_CODEL_MAX + 1];
 157         unsigned int limit;
 158         unsigned int flows;
 159         unsigned int interval;
 160         unsigned int target;
 161         unsigned int ecn;
 162         unsigned int quantum;
 163         unsigned int ce_threshold;
 164         unsigned int memory_limit;
 165
 166         SPRINT_BUF(b1);
 167
 168         if (opt == NULL)
 169                 return 0;
 170
 171         parse_rtattr_nested(tb, TCA_FQ_CODEL_MAX, opt);
 172
 173         if (tb[TCA_FQ_CODEL_LIMIT] &&
 174             RTA_PAYLOAD(tb[TCA_FQ_CODEL_LIMIT]) >= sizeof(__u32)) {
 175                 limit = rta_getattr_u32(tb[TCA_FQ_CODEL_LIMIT]);
 176                 fprintf(f, "limit %up ", limit);
 177         }
 178         if (tb[TCA_FQ_CODEL_FLOWS] &&
 179             RTA_PAYLOAD(tb[TCA_FQ_CODEL_FLOWS]) >= sizeof(__u32)) {
 180                 flows = rta_getattr_u32(tb[TCA_FQ_CODEL_FLOWS]);
 181                 fprintf(f, "flows %u ", flows);
 182         }
 183         if (tb[TCA_FQ_CODEL_QUANTUM] &&
 184             RTA_PAYLOAD(tb[TCA_FQ_CODEL_QUANTUM]) >= sizeof(__u32)) {
 185                 quantum = rta_getattr_u32(tb[TCA_FQ_CODEL_QUANTUM]);
 186                 fprintf(f, "quantum %u ", quantum);
 187         }
 188         if (tb[TCA_FQ_CODEL_TARGET] &&
 189             RTA_PAYLOAD(tb[TCA_FQ_CODEL_TARGET]) >= sizeof(__u32)) {
 190                 target = rta_getattr_u32(tb[TCA_FQ_CODEL_TARGET]);
 191                 fprintf(f, "target %s ", sprint_time(target, b1));
 192         }
 193         if (tb[TCA_FQ_CODEL_CE_THRESHOLD] &&
 194             RTA_PAYLOAD(tb[TCA_FQ_CODEL_CE_THRESHOLD]) >= sizeof(__u32)) {
 195                 ce_threshold = rta_getattr_u32(tb[TCA_FQ_CODEL_CE_THRESHOLD]);
 196                 fprintf(f, "ce_threshold %s ", sprint_time(ce_threshold, b1));
 197         }
 198         if (tb[TCA_FQ_CODEL_INTERVAL] &&
 199             RTA_PAYLOAD(tb[TCA_FQ_CODEL_INTERVAL]) >= sizeof(__u32)) {
 200                 interval = rta_getattr_u32(tb[TCA_FQ_CODEL_INTERVAL]);
 201                 fprintf(f, "interval %s ", sprint_time(interval, b1));
 202         }
 203         if (tb[TCA_FQ_CODEL_MEMORY_LIMIT] &&
 204             RTA_PAYLOAD(tb[TCA_FQ_CODEL_MEMORY_LIMIT]) >= sizeof(__u32)) {
 205                 memory_limit = rta_getattr_u32(tb[TCA_FQ_CODEL_MEMORY_LIMIT]);
 206
 207                 fprintf(f, "memory_limit %s ", sprint_size(memory_limit, b1));
 208         }
 209         if (tb[TCA_FQ_CODEL_ECN] &&
 210             RTA_PAYLOAD(tb[TCA_FQ_CODEL_ECN]) >= sizeof(__u32)) {
 211                 ecn = rta_getattr_u32(tb[TCA_FQ_CODEL_ECN]);
 212                 if (ecn)
 213                         fprintf(f, "ecn ");
 214         }
 215
 216         return 0;
 217 }
 218
 219 static int fq_codel_print_xstats(struct qdisc_util *qu, FILE *f,
 220                                  struct rtattr *xstats)
 221 {
 222         struct tc_fq_codel_xstats _st = {}, *st;
 223
 224         SPRINT_BUF(b1);
 225
 226         if (xstats == NULL)
 227                 return 0;
 228
 229         st = RTA_DATA(xstats);
 230         if (RTA_PAYLOAD(xstats) < sizeof(*st)) {
 231                 memcpy(&_st, st, RTA_PAYLOAD(xstats));
 232                 st = &_st;
 233         }
 234         if (st->type == TCA_FQ_CODEL_XSTATS_QDISC) {
 235                 fprintf(f, "  maxpacket %u drop_overlimit %u new_flow_count %u ecn_mark %u",
 236                         st->qdisc_stats.maxpacket,
 237                         st->qdisc_stats.drop_overlimit,
 238                         st->qdisc_stats.new_flow_count,
 239                         st->qdisc_stats.ecn_mark);
 240                 if (st->qdisc_stats.ce_mark)
 241                         fprintf(f, " ce_mark %u", st->qdisc_stats.ce_mark);
 242                 if (st->qdisc_stats.memory_usage)
 243                         fprintf(f, " memory_used %u", st->qdisc_stats.memory_usage);
 244                 if (st->qdisc_stats.drop_overmemory)
 245                         fprintf(f, " drop_overmemory %u", st->qdisc_stats.drop_overmemory);
 246                 fprintf(f, "\n  new_flows_len %u old_flows_len %u",
 247                         st->qdisc_stats.new_flows_len,
 248                         st->qdisc_stats.old_flows_len);
 249         }
 250         if (st->type == TCA_FQ_CODEL_XSTATS_CLASS) {
 251                 fprintf(f, "  deficit %d count %u lastcount %u ldelay %s",
 252                         st->class_stats.deficit,
 253                         st->class_stats.count,
 254                         st->class_stats.lastcount,
 255                         sprint_time(st->class_stats.ldelay, b1));
 256                 if (st->class_stats.dropping) {
 257                         fprintf(f, " dropping");
 258                         if (st->class_stats.drop_next < 0)
 259                                 fprintf(f, " drop_next -%s",
 260                                         sprint_time(-st->class_stats.drop_next, b1));
 261                         else
 262                                 fprintf(f, " drop_next %s",
 263                                         sprint_time(st->class_stats.drop_next, b1));
 264                 }
 265         }
 266         return 0;
 267
 268 }
 269
 270 struct qdisc_util fq_codel_qdisc_util = {
 271         .id             = "fq_codel",
 272         .parse_qopt     = fq_codel_parse_opt,
 273         .print_qopt     = fq_codel_print_opt,
 274         .print_xstats   = fq_codel_print_xstats,
 275 };