tc/q_pie.c

   1 /* Copyright (C) 2013 Cisco Systems, Inc, 2013.
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License
   5  * as published by the Free Software Foundation; either version 2
   6  * of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * Author: Vijay Subramanian <vijaynsu@cisco.com>
  14  * Author: Mythili Prabhu <mysuryan@cisco.com>
  15  *
  16  */
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <fcntl.h>
  22 #include <sys/socket.h>
  23 #include <netinet/in.h>
  24 #include <arpa/inet.h>
  25 #include <string.h>
  26 #include <math.h>
  27
  28 #include "utils.h"
  29 #include "tc_util.h"
  30
  31 static void explain(void)
  32 {
  33         fprintf(stderr, "Usage: ... pie [ limit PACKETS ][ target TIME us]\n");
  34         fprintf(stderr, "              [ tupdate TIME us][ alpha ALPHA ]");
  35         fprintf(stderr, "[beta BETA ][bytemode | nobytemode][ecn | noecn ]\n");
  36 }
  37
  38 #define ALPHA_MAX 32
  39 #define BETA_MAX 32
  40
  41 static int pie_parse_opt(struct qdisc_util *qu, int argc, char **argv,
  42                          struct nlmsghdr *n, const char *dev)
  43 {
  44         unsigned int limit   = 0;
  45         unsigned int target  = 0;
  46         unsigned int tupdate = 0;
  47         unsigned int alpha   = 0;
  48         unsigned int beta    = 0;
  49         int ecn = -1;
  50         int bytemode = -1;
  51         struct rtattr *tail;
  52
  53         while (argc > 0) {
  54                 if (strcmp(*argv, "limit") == 0) {
  55                         NEXT_ARG();
  56                         if (get_unsigned(&limit, *argv, 0)) {
  57                                 fprintf(stderr, "Illegal \"limit\"\n");
  58                                 return -1;
  59                         }
  60                 } else if (strcmp(*argv, "target") == 0) {
  61                         NEXT_ARG();
  62                         if (get_time(&target, *argv)) {
  63                                 fprintf(stderr, "Illegal \"target\"\n");
  64                                 return -1;
  65                         }
  66                 } else if (strcmp(*argv, "tupdate") == 0) {
  67                         NEXT_ARG();
  68                         if (get_time(&tupdate, *argv)) {
  69                                 fprintf(stderr, "Illegal \"tupdate\"\n");
  70                                 return -1;
  71                         }
  72                 } else if (strcmp(*argv, "alpha") == 0) {
  73                         NEXT_ARG();
  74                         if (get_unsigned(&alpha, *argv, 0) ||
  75                             (alpha > ALPHA_MAX)) {
  76                                 fprintf(stderr, "Illegal \"alpha\"\n");
  77                                 return -1;
  78                         }
  79                 } else if (strcmp(*argv, "beta") == 0) {
  80                         NEXT_ARG();
  81                         if (get_unsigned(&beta, *argv, 0) ||
  82                             (beta > BETA_MAX)) {
  83                                 fprintf(stderr, "Illegal \"beta\"\n");
  84                                 return -1;
  85                         }
  86                 } else if (strcmp(*argv, "ecn") == 0) {
  87                         ecn = 1;
  88                 } else if (strcmp(*argv, "noecn") == 0) {
  89                         ecn = 0;
  90                 } else if (strcmp(*argv, "bytemode") == 0) {
  91                         bytemode = 1;
  92                 } else if (strcmp(*argv, "nobytemode") == 0) {
  93                         bytemode = 0;
  94                 } else if (strcmp(*argv, "help") == 0) {
  95                         explain();
  96                         return -1;
  97                 } else {
  98                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  99                         explain();
 100                         return -1;
 101                 }
 102                 argc--;
 103                 argv++;
 104         }
 105
 106         tail = addattr_nest(n, 1024, TCA_OPTIONS);
 107         if (limit)
 108                 addattr_l(n, 1024, TCA_PIE_LIMIT, &limit, sizeof(limit));
 109         if (tupdate)
 110                 addattr_l(n, 1024, TCA_PIE_TUPDATE, &tupdate, sizeof(tupdate));
 111         if (target)
 112                 addattr_l(n, 1024, TCA_PIE_TARGET, &target, sizeof(target));
 113         if (alpha)
 114                 addattr_l(n, 1024, TCA_PIE_ALPHA, &alpha, sizeof(alpha));
 115         if (beta)
 116                 addattr_l(n, 1024, TCA_PIE_BETA, &beta, sizeof(beta));
 117         if (ecn != -1)
 118                 addattr_l(n, 1024, TCA_PIE_ECN, &ecn, sizeof(ecn));
 119         if (bytemode != -1)
 120                 addattr_l(n, 1024, TCA_PIE_BYTEMODE, &bytemode,
 121                           sizeof(bytemode));
 122
 123         addattr_nest_end(n, tail);
 124         return 0;
 125 }
 126
 127 static int pie_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 128 {
 129         struct rtattr *tb[TCA_PIE_MAX + 1];
 130         unsigned int limit;
 131         unsigned int tupdate;
 132         unsigned int target;
 133         unsigned int alpha;
 134         unsigned int beta;
 135         unsigned int ecn;
 136         unsigned int bytemode;
 137
 138         SPRINT_BUF(b1);
 139
 140         if (opt == NULL)
 141                 return 0;
 142
 143         parse_rtattr_nested(tb, TCA_PIE_MAX, opt);
 144
 145         if (tb[TCA_PIE_LIMIT] &&
 146             RTA_PAYLOAD(tb[TCA_PIE_LIMIT]) >= sizeof(__u32)) {
 147                 limit = rta_getattr_u32(tb[TCA_PIE_LIMIT]);
 148                 fprintf(f, "limit %up ", limit);
 149         }
 150         if (tb[TCA_PIE_TARGET] &&
 151             RTA_PAYLOAD(tb[TCA_PIE_TARGET]) >= sizeof(__u32)) {
 152                 target = rta_getattr_u32(tb[TCA_PIE_TARGET]);
 153                 fprintf(f, "target %s ", sprint_time(target, b1));
 154         }
 155         if (tb[TCA_PIE_TUPDATE] &&
 156             RTA_PAYLOAD(tb[TCA_PIE_TUPDATE]) >= sizeof(__u32)) {
 157                 tupdate = rta_getattr_u32(tb[TCA_PIE_TUPDATE]);
 158                 fprintf(f, "tupdate %s ", sprint_time(tupdate, b1));
 159         }
 160         if (tb[TCA_PIE_ALPHA] &&
 161             RTA_PAYLOAD(tb[TCA_PIE_ALPHA]) >= sizeof(__u32)) {
 162                 alpha = rta_getattr_u32(tb[TCA_PIE_ALPHA]);
 163                 fprintf(f, "alpha %u ", alpha);
 164         }
 165         if (tb[TCA_PIE_BETA] &&
 166             RTA_PAYLOAD(tb[TCA_PIE_BETA]) >= sizeof(__u32)) {
 167                 beta = rta_getattr_u32(tb[TCA_PIE_BETA]);
 168                 fprintf(f, "beta %u ", beta);
 169         }
 170
 171         if (tb[TCA_PIE_ECN] && RTA_PAYLOAD(tb[TCA_PIE_ECN]) >= sizeof(__u32)) {
 172                 ecn = rta_getattr_u32(tb[TCA_PIE_ECN]);
 173                 if (ecn)
 174                         fprintf(f, "ecn ");
 175         }
 176
 177         if (tb[TCA_PIE_BYTEMODE] &&
 178             RTA_PAYLOAD(tb[TCA_PIE_BYTEMODE]) >= sizeof(__u32)) {
 179                 bytemode = rta_getattr_u32(tb[TCA_PIE_BYTEMODE]);
 180                 if (bytemode)
 181                         fprintf(f, "bytemode ");
 182         }
 183
 184         return 0;
 185 }
 186
 187 static int pie_print_xstats(struct qdisc_util *qu, FILE *f,
 188                             struct rtattr *xstats)
 189 {
 190         struct tc_pie_xstats *st;
 191
 192         if (xstats == NULL)
 193                 return 0;
 194
 195         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 196                 return -1;
 197
 198         st = RTA_DATA(xstats);
 199         /*prob is returned as a fracion of maximum integer value */
 200         fprintf(f, "prob %f delay %uus avg_dq_rate %u\n",
 201                 (double)st->prob / (double)0xffffffff, st->delay,
 202                 st->avg_dq_rate);
 203         fprintf(f, "pkts_in %u overlimit %u dropped %u maxq %u ecn_mark %u\n",
 204                 st->packets_in, st->overlimit, st->dropped, st->maxq,
 205                 st->ecn_mark);
 206         return 0;
 207
 208 }
 209
 210 struct qdisc_util pie_qdisc_util = {
 211         .id = "pie",
 212         .parse_qopt     = pie_parse_opt,
 213         .print_qopt     = pie_print_opt,
 214         .print_xstats   = pie_print_xstats,
 215 };