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-rw-r--r--tc/q_sfq.c279
1 files changed, 279 insertions, 0 deletions
diff --git a/tc/q_sfq.c b/tc/q_sfq.c
new file mode 100644
index 0000000..17bf8f6
--- /dev/null
+++ b/tc/q_sfq.c
@@ -0,0 +1,279 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * q_sfq.c SFQ.
+ *
+ * Authors: 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"
+
+static void explain(void)
+{
+ fprintf(stderr,
+ "Usage: ... sfq [ limit NUMBER ] [ perturb SECS ] [ quantum BYTES ]\n"
+ " [ divisor NUMBER ] [ flows NUMBER] [ depth NUMBER ]\n"
+ " [ headdrop ]\n"
+ " [ redflowlimit BYTES ] [ min BYTES ] [ max BYTES ]\n"
+ " [ avpkt BYTES ] [ burst PACKETS ] [ probability P ]\n"
+ " [ ecn ] [ harddrop ]\n");
+}
+
+static int sfq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
+{
+ int ok = 0, red = 0;
+ struct tc_sfq_qopt_v1 opt = {};
+ unsigned int burst = 0;
+ int wlog;
+ unsigned int avpkt = 1000;
+ double probability = 0.02;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "quantum") == 0) {
+ NEXT_ARG();
+ if (get_size(&opt.v0.quantum, *argv)) {
+ fprintf(stderr, "Illegal \"limit\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "perturb") == 0) {
+ NEXT_ARG();
+ if (get_integer(&opt.v0.perturb_period, *argv, 0)) {
+ fprintf(stderr, "Illegal \"perturb\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "limit") == 0) {
+ NEXT_ARG();
+ if (get_u32(&opt.v0.limit, *argv, 0)) {
+ fprintf(stderr, "Illegal \"limit\"\n");
+ return -1;
+ }
+ if (opt.v0.limit < 2) {
+ fprintf(stderr, "Illegal \"limit\", must be > 1\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "divisor") == 0) {
+ NEXT_ARG();
+ if (get_u32(&opt.v0.divisor, *argv, 0)) {
+ fprintf(stderr, "Illegal \"divisor\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "flows") == 0) {
+ NEXT_ARG();
+ if (get_u32(&opt.v0.flows, *argv, 0)) {
+ fprintf(stderr, "Illegal \"flows\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "depth") == 0) {
+ NEXT_ARG();
+ if (get_u32(&opt.depth, *argv, 0)) {
+ fprintf(stderr, "Illegal \"flows\"\n");
+ return -1;
+ }
+ ok++;
+ } else if (strcmp(*argv, "headdrop") == 0) {
+ opt.headdrop = 1;
+ ok++;
+ } else if (strcmp(*argv, "redflowlimit") == 0) {
+ NEXT_ARG();
+ if (get_u32(&opt.limit, *argv, 0)) {
+ fprintf(stderr, "Illegal \"redflowlimit\"\n");
+ return -1;
+ }
+ red++;
+ } else if (strcmp(*argv, "min") == 0) {
+ NEXT_ARG();
+ if (get_u32(&opt.qth_min, *argv, 0)) {
+ fprintf(stderr, "Illegal \"min\"\n");
+ return -1;
+ }
+ red++;
+ } else if (strcmp(*argv, "max") == 0) {
+ NEXT_ARG();
+ if (get_u32(&opt.qth_max, *argv, 0)) {
+ fprintf(stderr, "Illegal \"max\"\n");
+ return -1;
+ }
+ red++;
+ } else if (strcmp(*argv, "burst") == 0) {
+ NEXT_ARG();
+ if (get_unsigned(&burst, *argv, 0)) {
+ fprintf(stderr, "Illegal \"burst\"\n");
+ return -1;
+ }
+ red++;
+ } else if (strcmp(*argv, "avpkt") == 0) {
+ NEXT_ARG();
+ if (get_size(&avpkt, *argv)) {
+ fprintf(stderr, "Illegal \"avpkt\"\n");
+ return -1;
+ }
+ red++;
+ } else if (strcmp(*argv, "probability") == 0) {
+ NEXT_ARG();
+ if (sscanf(*argv, "%lg", &probability) != 1) {
+ fprintf(stderr, "Illegal \"probability\"\n");
+ return -1;
+ }
+ red++;
+ } else if (strcmp(*argv, "ecn") == 0) {
+ opt.flags |= TC_RED_ECN;
+ red++;
+ } else if (strcmp(*argv, "harddrop") == 0) {
+ opt.flags |= TC_RED_HARDDROP;
+ red++;
+ } else if (strcmp(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else {
+ fprintf(stderr, "What is \"%s\"?\n", *argv);
+ explain();
+ return -1;
+ }
+ argc--; argv++;
+ }
+ if (red) {
+ if (!opt.limit) {
+ fprintf(stderr, "Required parameter (redflowlimit) is missing\n");
+ return -1;
+ }
+ /* Compute default min/max thresholds based on
+ Sally Floyd's recommendations:
+ http://www.icir.org/floyd/REDparameters.txt
+ */
+ if (!opt.qth_max)
+ opt.qth_max = opt.limit / 4;
+ if (!opt.qth_min)
+ opt.qth_min = opt.qth_max / 3;
+ if (!burst)
+ burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt);
+
+ if (opt.qth_max > opt.limit) {
+ fprintf(stderr, "\"max\" is larger than \"limit\"\n");
+ return -1;
+ }
+
+ if (opt.qth_min >= opt.qth_max) {
+ fprintf(stderr, "\"min\" is not smaller than \"max\"\n");
+ return -1;
+ }
+
+ wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt);
+ if (wlog < 0) {
+ fprintf(stderr, "SFQ: failed to calculate EWMA constant.\n");
+ return -1;
+ }
+ if (wlog >= 10)
+ fprintf(stderr, "SFQ: WARNING. Burst %u seems to be too large.\n", burst);
+ opt.Wlog = wlog;
+
+ wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability);
+ if (wlog < 0) {
+ fprintf(stderr, "SFQ: failed to calculate probability.\n");
+ return -1;
+ }
+ opt.Plog = wlog;
+ opt.max_P = probability * pow(2, 32);
+ }
+
+ if (ok || red)
+ addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
+ return 0;
+}
+
+static int sfq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+ struct tc_sfq_qopt *qopt;
+ struct tc_sfq_qopt_v1 *qopt_ext = NULL;
+
+ if (opt == NULL)
+ return 0;
+
+ if (RTA_PAYLOAD(opt) < sizeof(*qopt))
+ return -1;
+ if (RTA_PAYLOAD(opt) >= sizeof(*qopt_ext))
+ qopt_ext = RTA_DATA(opt);
+ qopt = RTA_DATA(opt);
+
+ print_uint(PRINT_ANY, "limit", "limit %up ", qopt->limit);
+ print_size(PRINT_ANY, "quantum", "quantum %s ", qopt->quantum);
+
+ if (qopt_ext && qopt_ext->depth)
+ print_uint(PRINT_ANY, "depth", "depth %u ", qopt_ext->depth);
+ if (qopt_ext && qopt_ext->headdrop)
+ print_bool(PRINT_ANY, "headdrop", "headdrop ", true);
+ if (show_details)
+ print_uint(PRINT_ANY, "flows", "flows %u ", qopt->flows);
+
+ print_uint(PRINT_ANY, "divisor", "divisor %u ", qopt->divisor);
+
+ if (qopt->perturb_period)
+ print_int(PRINT_ANY, "perturb", "perturb %dsec ",
+ qopt->perturb_period);
+ if (qopt_ext && qopt_ext->qth_min) {
+ print_uint(PRINT_ANY, "ewma", "ewma %u ", qopt_ext->Wlog);
+ print_size(PRINT_ANY, "min", "min %s ", qopt_ext->qth_min);
+ print_size(PRINT_ANY, "max", "max %s ", qopt_ext->qth_max);
+ print_float(PRINT_ANY, "probability", "probability %lg ",
+ qopt_ext->max_P / pow(2, 32));
+ tc_red_print_flags(qopt_ext->flags);
+ if (show_stats) {
+ print_nl();
+ print_uint(PRINT_ANY, "prob_mark", " prob_mark %u",
+ qopt_ext->stats.prob_mark);
+ print_uint(PRINT_ANY, "prob_mark_head",
+ " prob_mark_head %u",
+ qopt_ext->stats.prob_mark_head);
+ print_uint(PRINT_ANY, "prob_drop", " prob_drop %u",
+ qopt_ext->stats.prob_drop);
+ print_nl();
+ print_uint(PRINT_ANY, "forced_mark",
+ " forced_mark %u",
+ qopt_ext->stats.forced_mark);
+ print_uint(PRINT_ANY, "forced_mark_head",
+ " forced_mark_head %u",
+ qopt_ext->stats.forced_mark_head);
+ print_uint(PRINT_ANY, "forced_drop", " forced_drop %u",
+ qopt_ext->stats.forced_drop);
+ }
+ }
+ return 0;
+}
+
+static int sfq_print_xstats(struct qdisc_util *qu, FILE *f,
+ struct rtattr *xstats)
+{
+ struct tc_sfq_xstats *st;
+
+ if (xstats == NULL)
+ return 0;
+ if (RTA_PAYLOAD(xstats) < sizeof(*st))
+ return -1;
+ st = RTA_DATA(xstats);
+
+ print_int(PRINT_ANY, "allot", " allot %d", st->allot);
+
+ return 0;
+}
+
+struct qdisc_util sfq_qdisc_util = {
+ .id = "sfq",
+ .parse_qopt = sfq_parse_opt,
+ .print_qopt = sfq_print_opt,
+ .print_xstats = sfq_print_xstats,
+};
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