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-rw-r--r--tc/q_gred.c502
1 files changed, 502 insertions, 0 deletions
diff --git a/tc/q_gred.c b/tc/q_gred.c
new file mode 100644
index 0000000..f6a3f05
--- /dev/null
+++ b/tc/q_gred.c
@@ -0,0 +1,502 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * q_gred.c GRED.
+ *
+ * Authors: J Hadi Salim(hadi@nortelnetworks.com)
+ * code ruthlessly ripped from
+ * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <math.h>
+
+#include "utils.h"
+#include "tc_util.h"
+
+#include "tc_red.h"
+
+#ifdef DEBUG
+#define DPRINTF(format, args...) fprintf(stderr, format, ##args)
+#else
+#define DPRINTF(format, args...)
+#endif
+
+static void explain(void)
+{
+ fprintf(stderr,
+ "Usage: tc qdisc { add | replace | change } ... gred setup vqs NUMBER\n"
+ " default DEFAULT_VQ [ grio ] [ limit BYTES ] [ecn] [harddrop]\n"
+ " tc qdisc change ... gred vq VQ [ prio VALUE ] limit BYTES\n"
+ " min BYTES max BYTES avpkt BYTES [ burst PACKETS ]\n"
+ " [ probability PROBABILITY ] [ bandwidth KBPS ] [ecn] [harddrop]\n");
+}
+
+static int init_gred(struct qdisc_util *qu, int argc, char **argv,
+ struct nlmsghdr *n)
+{
+
+ struct rtattr *tail;
+ struct tc_gred_sopt opt = { 0 };
+ __u32 limit = 0;
+
+ opt.def_DP = MAX_DPs;
+
+ while (argc > 0) {
+ DPRINTF(stderr, "init_gred: invoked with %s\n", *argv);
+ if (strcmp(*argv, "vqs") == 0 ||
+ strcmp(*argv, "DPs") == 0) {
+ NEXT_ARG();
+ if (get_unsigned(&opt.DPs, *argv, 10)) {
+ fprintf(stderr, "Illegal \"vqs\"\n");
+ return -1;
+ } else if (opt.DPs > MAX_DPs) {
+ fprintf(stderr, "GRED: only %u VQs are currently supported\n",
+ MAX_DPs);
+ return -1;
+ }
+ } else if (strcmp(*argv, "default") == 0) {
+ if (opt.DPs == 0) {
+ fprintf(stderr, "\"default\" must be defined after \"vqs\"\n");
+ return -1;
+ }
+ NEXT_ARG();
+ if (get_unsigned(&opt.def_DP, *argv, 10)) {
+ fprintf(stderr, "Illegal \"default\"\n");
+ return -1;
+ } else if (opt.def_DP >= opt.DPs) {
+ fprintf(stderr, "\"default\" must be less than \"vqs\"\n");
+ return -1;
+ }
+ } else if (strcmp(*argv, "grio") == 0) {
+ opt.grio = 1;
+ } else if (strcmp(*argv, "limit") == 0) {
+ NEXT_ARG();
+ if (get_size(&limit, *argv)) {
+ fprintf(stderr, "Illegal \"limit\"\n");
+ return -1;
+ }
+ } else if (strcmp(*argv, "ecn") == 0) {
+ opt.flags |= TC_RED_ECN;
+ } else if (strcmp(*argv, "harddrop") == 0) {
+ opt.flags |= TC_RED_HARDDROP;
+ } else if (strcmp(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else {
+ fprintf(stderr, "What is \"%s\"?\n", *argv);
+ explain();
+ return -1;
+ }
+ argc--; argv++;
+ }
+
+ if (!opt.DPs || opt.def_DP == MAX_DPs) {
+ fprintf(stderr, "Illegal gred setup parameters\n");
+ return -1;
+ }
+
+ DPRINTF("TC_GRED: sending DPs=%u def_DP=%u\n", opt.DPs, opt.def_DP);
+ n->nlmsg_flags |= NLM_F_CREATE;
+ tail = addattr_nest(n, 1024, TCA_OPTIONS);
+ addattr_l(n, 1024, TCA_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
+ if (limit)
+ addattr32(n, 1024, TCA_GRED_LIMIT, limit);
+ addattr_nest_end(n, tail);
+ return 0;
+}
+/*
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+*/
+static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
+{
+ struct rtattr *tail, *entry, *vqs;
+ int ok = 0;
+ struct tc_gred_qopt opt = { 0 };
+ unsigned int burst = 0;
+ unsigned int avpkt = 0;
+ unsigned int flags = 0;
+ double probability = 0.02;
+ unsigned int rate = 0;
+ int parm;
+ __u8 sbuf[256];
+ __u32 max_P;
+
+ opt.DP = MAX_DPs;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "limit") == 0) {
+ NEXT_ARG();
+ if (get_size(&opt.limit, *argv)) {
+ fprintf(stderr, "Illegal \"limit\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "setup") == 0) {
+ if (ok) {
+ fprintf(stderr, "Illegal \"setup\"\n");
+ return -1;
+ }
+ return init_gred(qu, argc-1, argv+1, n);
+ } else if (strcmp(*argv, "min") == 0) {
+ NEXT_ARG();
+ if (get_size(&opt.qth_min, *argv)) {
+ fprintf(stderr, "Illegal \"min\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "max") == 0) {
+ NEXT_ARG();
+ if (get_size(&opt.qth_max, *argv)) {
+ fprintf(stderr, "Illegal \"max\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "vq") == 0 ||
+ strcmp(*argv, "DP") == 0) {
+ NEXT_ARG();
+ if (get_unsigned(&opt.DP, *argv, 10)) {
+ fprintf(stderr, "Illegal \"vq\"\n");
+ return -1;
+ } else if (opt.DP >= MAX_DPs) {
+ fprintf(stderr, "GRED: only %u VQs are currently supported\n",
+ MAX_DPs);
+ return -1;
+ } /* need a better error check */
+ ok++;
+ } else if (strcmp(*argv, "burst") == 0) {
+ NEXT_ARG();
+ if (get_unsigned(&burst, *argv, 0)) {
+ fprintf(stderr, "Illegal \"burst\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "avpkt") == 0) {
+ NEXT_ARG();
+ if (get_size(&avpkt, *argv)) {
+ fprintf(stderr, "Illegal \"avpkt\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "probability") == 0) {
+ NEXT_ARG();
+ if (sscanf(*argv, "%lg", &probability) != 1) {
+ fprintf(stderr, "Illegal \"probability\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "prio") == 0) {
+ NEXT_ARG();
+ opt.prio = strtol(*argv, (char **)NULL, 10);
+ /* some error check here */
+ ok++;
+ } else if (strcmp(*argv, "bandwidth") == 0) {
+ NEXT_ARG();
+ if (strchr(*argv, '%')) {
+ if (get_percent_rate(&rate, *argv, dev)) {
+ fprintf(stderr, "Illegal \"bandwidth\"\n");
+ return -1;
+ }
+ } else if (get_rate(&rate, *argv)) {
+ fprintf(stderr, "Illegal \"bandwidth\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "ecn") == 0) {
+ flags |= TC_RED_ECN;
+ } else if (strcmp(*argv, "harddrop") == 0) {
+ flags |= TC_RED_HARDDROP;
+ } else if (strcmp(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else {
+ fprintf(stderr, "What is \"%s\"?\n", *argv);
+ explain();
+ return -1;
+ }
+ argc--; argv++;
+ }
+
+ if (!ok) {
+ explain();
+ return -1;
+ }
+ if (opt.DP == MAX_DPs || !opt.limit || !opt.qth_min || !opt.qth_max ||
+ !avpkt) {
+ fprintf(stderr, "Required parameter (vq, limit, min, max, avpkt) is missing\n");
+ return -1;
+ }
+ if (!burst) {
+ burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt);
+ fprintf(stderr, "GRED: set burst to %u\n", burst);
+ }
+ if (!rate) {
+ get_rate(&rate, "10Mbit");
+ fprintf(stderr, "GRED: set bandwidth to 10Mbit\n");
+ }
+ if ((parm = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
+ fprintf(stderr, "GRED: failed to calculate EWMA constant.\n");
+ return -1;
+ }
+ if (parm >= 10)
+ fprintf(stderr, "GRED: WARNING. Burst %u seems to be too large.\n",
+ burst);
+ opt.Wlog = parm;
+ if ((parm = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
+ fprintf(stderr, "GRED: failed to calculate probability.\n");
+ return -1;
+ }
+ opt.Plog = parm;
+ if ((parm = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0)
+ {
+ fprintf(stderr, "GRED: failed to calculate idle damping table.\n");
+ return -1;
+ }
+ opt.Scell_log = parm;
+
+ tail = addattr_nest(n, 1024, TCA_OPTIONS);
+ addattr_l(n, 1024, TCA_GRED_PARMS, &opt, sizeof(opt));
+ addattr_l(n, 1024, TCA_GRED_STAB, sbuf, 256);
+ max_P = probability * pow(2, 32);
+ addattr32(n, 1024, TCA_GRED_MAX_P, max_P);
+
+ vqs = addattr_nest(n, 1024, TCA_GRED_VQ_LIST);
+ entry = addattr_nest(n, 1024, TCA_GRED_VQ_ENTRY);
+ addattr32(n, 1024, TCA_GRED_VQ_DP, opt.DP);
+ addattr32(n, 1024, TCA_GRED_VQ_FLAGS, flags);
+ addattr_nest_end(n, entry);
+ addattr_nest_end(n, vqs);
+
+ addattr_nest_end(n, tail);
+ return 0;
+}
+
+struct tc_gred_info {
+ bool flags_present;
+ __u64 bytes;
+ __u32 packets;
+ __u32 backlog;
+ __u32 prob_drop;
+ __u32 prob_mark;
+ __u32 forced_drop;
+ __u32 forced_mark;
+ __u32 pdrop;
+ __u32 other;
+ __u32 flags;
+};
+
+static void
+gred_parse_vqs(struct tc_gred_info *info, struct rtattr *vqs)
+{
+ int rem = RTA_PAYLOAD(vqs);
+ unsigned int offset = 0;
+
+ while (rem > offset) {
+ struct rtattr *tb_entry[TCA_GRED_VQ_ENTRY_MAX + 1] = {};
+ struct rtattr *tb[TCA_GRED_VQ_MAX + 1] = {};
+ struct rtattr *entry;
+ unsigned int len;
+ unsigned int dp;
+
+ entry = RTA_DATA(vqs) + offset;
+
+ parse_rtattr(tb_entry, TCA_GRED_VQ_ENTRY_MAX, entry,
+ rem - offset);
+ len = RTA_LENGTH(RTA_PAYLOAD(entry));
+ offset += len;
+
+ if (!tb_entry[TCA_GRED_VQ_ENTRY]) {
+ fprintf(stderr,
+ "ERROR: Failed to parse Virtual Queue entry\n");
+ continue;
+ }
+
+ parse_rtattr_nested(tb, TCA_GRED_VQ_MAX,
+ tb_entry[TCA_GRED_VQ_ENTRY]);
+
+ if (!tb[TCA_GRED_VQ_DP]) {
+ fprintf(stderr,
+ "ERROR: Virtual Queue without DP attribute\n");
+ continue;
+ }
+
+ dp = rta_getattr_u32(tb[TCA_GRED_VQ_DP]);
+
+ if (tb[TCA_GRED_VQ_STAT_BYTES])
+ info[dp].bytes =
+ rta_getattr_u32(tb[TCA_GRED_VQ_STAT_BYTES]);
+ if (tb[TCA_GRED_VQ_STAT_PACKETS])
+ info[dp].packets =
+ rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PACKETS]);
+ if (tb[TCA_GRED_VQ_STAT_BACKLOG])
+ info[dp].backlog =
+ rta_getattr_u32(tb[TCA_GRED_VQ_STAT_BACKLOG]);
+ if (tb[TCA_GRED_VQ_STAT_PROB_DROP])
+ info[dp].prob_drop =
+ rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PROB_DROP]);
+ if (tb[TCA_GRED_VQ_STAT_PROB_MARK])
+ info[dp].prob_mark =
+ rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PROB_MARK]);
+ if (tb[TCA_GRED_VQ_STAT_FORCED_DROP])
+ info[dp].forced_drop =
+ rta_getattr_u32(tb[TCA_GRED_VQ_STAT_FORCED_DROP]);
+ if (tb[TCA_GRED_VQ_STAT_FORCED_MARK])
+ info[dp].forced_mark =
+ rta_getattr_u32(tb[TCA_GRED_VQ_STAT_FORCED_MARK]);
+ if (tb[TCA_GRED_VQ_STAT_PDROP])
+ info[dp].pdrop =
+ rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PDROP]);
+ if (tb[TCA_GRED_VQ_STAT_OTHER])
+ info[dp].other =
+ rta_getattr_u32(tb[TCA_GRED_VQ_STAT_OTHER]);
+ info[dp].flags_present = !!tb[TCA_GRED_VQ_FLAGS];
+ if (tb[TCA_GRED_VQ_FLAGS])
+ info[dp].flags =
+ rta_getattr_u32(tb[TCA_GRED_VQ_FLAGS]);
+ }
+}
+
+static void
+gred_print_stats(struct tc_gred_info *info, struct tc_gred_qopt *qopt)
+{
+ __u64 bytes = info ? info->bytes : qopt->bytesin;
+
+ if (!is_json_context())
+ printf("\n Queue size: ");
+
+ print_size(PRINT_ANY, "qave", "average %s ", qopt->qave);
+ print_size(PRINT_ANY, "backlog", "current %s ", qopt->backlog);
+
+ if (!is_json_context())
+ printf("\n Dropped packets: ");
+
+ if (info) {
+ print_uint(PRINT_ANY, "forced_drop", "forced %u ",
+ info->forced_drop);
+ print_uint(PRINT_ANY, "prob_drop", "early %u ",
+ info->prob_drop);
+ print_uint(PRINT_ANY, "pdrop", "pdrop %u ", info->pdrop);
+ print_uint(PRINT_ANY, "other", "other %u ", info->other);
+
+ if (!is_json_context())
+ printf("\n Marked packets: ");
+ print_uint(PRINT_ANY, "forced_mark", "forced %u ",
+ info->forced_mark);
+ print_uint(PRINT_ANY, "prob_mark", "early %u ",
+ info->prob_mark);
+ } else {
+ print_uint(PRINT_ANY, "forced_drop", "forced %u ",
+ qopt->forced);
+ print_uint(PRINT_ANY, "prob_drop", "early %u ", qopt->early);
+ print_uint(PRINT_ANY, "pdrop", "pdrop %u ", qopt->pdrop);
+ print_uint(PRINT_ANY, "other", "other %u ", qopt->other);
+ }
+
+ if (!is_json_context())
+ printf("\n Total packets: ");
+
+ print_uint(PRINT_ANY, "packets", "%u ", qopt->packets);
+ print_size(PRINT_ANY, "bytes", "(%s) ", bytes);
+}
+
+static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+ struct tc_gred_info infos[MAX_DPs] = {};
+ struct rtattr *tb[TCA_GRED_MAX + 1];
+ struct tc_gred_sopt *sopt;
+ struct tc_gred_qopt *qopt;
+ bool vq_info = false;
+ __u32 *max_p = NULL;
+ __u32 *limit = NULL;
+ unsigned int i;
+
+ if (opt == NULL)
+ return 0;
+
+ parse_rtattr_nested(tb, TCA_GRED_MAX, opt);
+
+ if (tb[TCA_GRED_PARMS] == NULL)
+ return -1;
+
+ if (tb[TCA_GRED_MAX_P] &&
+ RTA_PAYLOAD(tb[TCA_GRED_MAX_P]) >= sizeof(__u32) * MAX_DPs)
+ max_p = RTA_DATA(tb[TCA_GRED_MAX_P]);
+
+ if (tb[TCA_GRED_LIMIT] &&
+ RTA_PAYLOAD(tb[TCA_GRED_LIMIT]) == sizeof(__u32))
+ limit = RTA_DATA(tb[TCA_GRED_LIMIT]);
+
+ sopt = RTA_DATA(tb[TCA_GRED_DPS]);
+ qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
+ if (RTA_PAYLOAD(tb[TCA_GRED_DPS]) < sizeof(*sopt) ||
+ RTA_PAYLOAD(tb[TCA_GRED_PARMS]) < sizeof(*qopt)*MAX_DPs) {
+ fprintf(f, "\n GRED received message smaller than expected\n");
+ return -1;
+ }
+
+ if (tb[TCA_GRED_VQ_LIST]) {
+ gred_parse_vqs(infos, tb[TCA_GRED_VQ_LIST]);
+ vq_info = true;
+ }
+
+ print_uint(PRINT_ANY, "dp_cnt", "vqs %u ", sopt->DPs);
+ print_uint(PRINT_ANY, "dp_default", "default %u ", sopt->def_DP);
+
+ if (sopt->grio)
+ print_bool(PRINT_ANY, "grio", "grio ", true);
+ else
+ print_bool(PRINT_ANY, "grio", NULL, false);
+
+ if (limit)
+ print_size(PRINT_ANY, "limit", "limit %s ", *limit);
+
+ tc_red_print_flags(sopt->flags);
+
+ open_json_array(PRINT_JSON, "vqs");
+ for (i = 0; i < MAX_DPs; i++, qopt++) {
+ if (qopt->DP >= MAX_DPs)
+ continue;
+
+ open_json_object(NULL);
+
+ print_uint(PRINT_ANY, "vq", "\n vq %u ", qopt->DP);
+ print_hhu(PRINT_ANY, "prio", "prio %hhu ", qopt->prio);
+ print_size(PRINT_ANY, "limit", "limit %s ", qopt->limit);
+ print_size(PRINT_ANY, "min", "min %s ", qopt->qth_min);
+ print_size(PRINT_ANY, "max", "max %s ", qopt->qth_max);
+
+ if (infos[i].flags_present)
+ tc_red_print_flags(infos[i].flags);
+
+ if (show_details) {
+ print_uint(PRINT_ANY, "ewma", "ewma %u ", qopt->Wlog);
+ if (max_p)
+ print_float(PRINT_ANY, "probability",
+ "probability %lg ",
+ max_p[i] / pow(2, 32));
+ else
+ print_uint(PRINT_ANY, "Plog", "Plog %u ",
+ qopt->Plog);
+ print_uint(PRINT_ANY, "Scell_log", "Scell_log %u ",
+ qopt->Scell_log);
+ }
+ if (show_stats)
+ gred_print_stats(vq_info ? &infos[i] : NULL, qopt);
+ close_json_object();
+ }
+ close_json_array(PRINT_JSON, "vqs");
+ return 0;
+}
+
+struct qdisc_util gred_qdisc_util = {
+ .id = "gred",
+ .parse_qopt = gred_parse_opt,
+ .print_qopt = gred_print_opt,
+};
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