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-rw-r--r--tc/q_hfsc.c411
1 files changed, 411 insertions, 0 deletions
diff --git a/tc/q_hfsc.c b/tc/q_hfsc.c
new file mode 100644
index 0000000..609d925
--- /dev/null
+++ b/tc/q_hfsc.c
@@ -0,0 +1,411 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * q_hfsc.c HFSC.
+ *
+ * Authors: Patrick McHardy, <kaber@trash.net>
+ */
+
+#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"
+
+static int hfsc_get_sc(int *, char ***,
+ struct tc_service_curve *, const char *);
+
+static void
+explain_qdisc(void)
+{
+ fprintf(stderr,
+ "Usage: ... hfsc [ default CLASSID ]\n"
+ "\n"
+ " default: default class for unclassified packets\n"
+ );
+}
+
+static void
+explain_class(void)
+{
+ fprintf(stderr,
+ "Usage: ... hfsc [ [ rt SC ] [ ls SC ] | [ sc SC ] ] [ ul SC ]\n"
+ "\n"
+ "SC := [ [ m1 BPS ] d SEC ] m2 BPS\n"
+ "\n"
+ " m1 : slope of first segment\n"
+ " d : x-coordinate of intersection\n"
+ " m2 : slope of second segment\n"
+ "\n"
+ "Alternative format:\n"
+ "\n"
+ "SC := [ [ umax BYTE ] dmax SEC ] rate BPS\n"
+ "\n"
+ " umax : maximum unit of work\n"
+ " dmax : maximum delay\n"
+ " rate : rate\n"
+ "\n"
+ "Remarks:\n"
+ " - at least one of 'rt', 'ls' or 'sc' must be specified\n"
+ " - 'ul' can only be specified with 'ls' or 'sc'\n"
+ "\n"
+ );
+}
+
+static void
+explain1(char *arg)
+{
+ fprintf(stderr, "HFSC: Illegal \"%s\"\n", arg);
+}
+
+static int
+hfsc_parse_opt(struct qdisc_util *qu, int argc, char **argv,
+ struct nlmsghdr *n, const char *dev)
+{
+ struct tc_hfsc_qopt qopt = {};
+
+ while (argc > 0) {
+ if (matches(*argv, "default") == 0) {
+ NEXT_ARG();
+ if (qopt.defcls != 0) {
+ fprintf(stderr, "HFSC: Double \"default\"\n");
+ return -1;
+ }
+ if (get_u16(&qopt.defcls, *argv, 16) < 0) {
+ explain1("default");
+ return -1;
+ }
+ } else if (matches(*argv, "help") == 0) {
+ explain_qdisc();
+ return -1;
+ } else {
+ fprintf(stderr, "HFSC: What is \"%s\" ?\n", *argv);
+ explain_qdisc();
+ return -1;
+ }
+ argc--, argv++;
+ }
+
+ addattr_l(n, 1024, TCA_OPTIONS, &qopt, sizeof(qopt));
+ return 0;
+}
+
+static int
+hfsc_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+ struct tc_hfsc_qopt *qopt;
+
+ if (opt == NULL)
+ return 0;
+ if (RTA_PAYLOAD(opt) < sizeof(*qopt))
+ return -1;
+ qopt = RTA_DATA(opt);
+
+ if (qopt->defcls != 0)
+ fprintf(f, "default %x ", qopt->defcls);
+
+ return 0;
+}
+
+static int
+hfsc_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
+{
+ struct tc_hfsc_stats *st;
+
+ if (xstats == NULL)
+ return 0;
+ if (RTA_PAYLOAD(xstats) < sizeof(*st))
+ return -1;
+ st = RTA_DATA(xstats);
+
+ fprintf(f, " period %u ", st->period);
+ if (st->work != 0)
+ fprintf(f, "work %llu bytes ", (unsigned long long) st->work);
+ if (st->rtwork != 0)
+ fprintf(f, "rtwork %llu bytes ", (unsigned long long) st->rtwork);
+ fprintf(f, "level %u ", st->level);
+ fprintf(f, "\n");
+
+ return 0;
+}
+
+static int
+hfsc_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
+ struct nlmsghdr *n, const char *dev)
+{
+ struct tc_service_curve rsc = {}, fsc = {}, usc = {};
+ int rsc_ok = 0, fsc_ok = 0, usc_ok = 0;
+ struct rtattr *tail;
+
+ while (argc > 0) {
+ if (matches(*argv, "rt") == 0) {
+ NEXT_ARG();
+ if (hfsc_get_sc(&argc, &argv, &rsc, dev) < 0) {
+ explain1("rt");
+ return -1;
+ }
+ rsc_ok = 1;
+ } else if (matches(*argv, "ls") == 0) {
+ NEXT_ARG();
+ if (hfsc_get_sc(&argc, &argv, &fsc, dev) < 0) {
+ explain1("ls");
+ return -1;
+ }
+ fsc_ok = 1;
+ } else if (matches(*argv, "sc") == 0) {
+ NEXT_ARG();
+ if (hfsc_get_sc(&argc, &argv, &rsc, dev) < 0) {
+ explain1("sc");
+ return -1;
+ }
+ memcpy(&fsc, &rsc, sizeof(fsc));
+ rsc_ok = 1;
+ fsc_ok = 1;
+ } else if (matches(*argv, "ul") == 0) {
+ NEXT_ARG();
+ if (hfsc_get_sc(&argc, &argv, &usc, dev) < 0) {
+ explain1("ul");
+ return -1;
+ }
+ usc_ok = 1;
+ } else if (matches(*argv, "help") == 0) {
+ explain_class();
+ return -1;
+ } else {
+ fprintf(stderr, "HFSC: What is \"%s\" ?\n", *argv);
+ explain_class();
+ return -1;
+ }
+ argc--, argv++;
+ }
+
+ if (!(rsc_ok || fsc_ok || usc_ok)) {
+ fprintf(stderr, "HFSC: no parameters given\n");
+ explain_class();
+ return -1;
+ }
+ if (usc_ok && !fsc_ok) {
+ fprintf(stderr, "HFSC: Upper-limit Service Curve without Link-Share Service Curve\n");
+ explain_class();
+ return -1;
+ }
+
+ tail = addattr_nest(n, 1024, TCA_OPTIONS);
+ if (rsc_ok)
+ addattr_l(n, 1024, TCA_HFSC_RSC, &rsc, sizeof(rsc));
+ if (fsc_ok)
+ addattr_l(n, 1024, TCA_HFSC_FSC, &fsc, sizeof(fsc));
+ if (usc_ok)
+ addattr_l(n, 1024, TCA_HFSC_USC, &usc, sizeof(usc));
+
+ addattr_nest_end(n, tail);
+ return 0;
+}
+
+static void
+hfsc_print_sc(FILE *f, char *name, struct tc_service_curve *sc)
+{
+ SPRINT_BUF(b1);
+
+ fprintf(f, "%s ", name);
+ tc_print_rate(PRINT_FP, NULL, "m1 %s ", sc->m1);
+ fprintf(f, "d %s ", sprint_time(tc_core_ktime2time(sc->d), b1));
+ tc_print_rate(PRINT_FP, NULL, "m2 %s ", sc->m2);
+}
+
+static int
+hfsc_print_class_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+ struct rtattr *tb[TCA_HFSC_MAX+1];
+ struct tc_service_curve *rsc = NULL, *fsc = NULL, *usc = NULL;
+
+ if (opt == NULL)
+ return 0;
+
+ parse_rtattr_nested(tb, TCA_HFSC_MAX, opt);
+
+ if (tb[TCA_HFSC_RSC]) {
+ if (RTA_PAYLOAD(tb[TCA_HFSC_RSC]) < sizeof(*rsc))
+ fprintf(stderr, "HFSC: truncated realtime option\n");
+ else
+ rsc = RTA_DATA(tb[TCA_HFSC_RSC]);
+ }
+ if (tb[TCA_HFSC_FSC]) {
+ if (RTA_PAYLOAD(tb[TCA_HFSC_FSC]) < sizeof(*fsc))
+ fprintf(stderr, "HFSC: truncated linkshare option\n");
+ else
+ fsc = RTA_DATA(tb[TCA_HFSC_FSC]);
+ }
+ if (tb[TCA_HFSC_USC]) {
+ if (RTA_PAYLOAD(tb[TCA_HFSC_USC]) < sizeof(*usc))
+ fprintf(stderr, "HFSC: truncated upperlimit option\n");
+ else
+ usc = RTA_DATA(tb[TCA_HFSC_USC]);
+ }
+
+
+ if (rsc != NULL && fsc != NULL &&
+ memcmp(rsc, fsc, sizeof(*rsc)) == 0)
+ hfsc_print_sc(f, "sc", rsc);
+ else {
+ if (rsc != NULL)
+ hfsc_print_sc(f, "rt", rsc);
+ if (fsc != NULL)
+ hfsc_print_sc(f, "ls", fsc);
+ }
+ if (usc != NULL)
+ hfsc_print_sc(f, "ul", usc);
+
+ return 0;
+}
+
+struct qdisc_util hfsc_qdisc_util = {
+ .id = "hfsc",
+ .parse_qopt = hfsc_parse_opt,
+ .print_qopt = hfsc_print_opt,
+ .print_xstats = hfsc_print_xstats,
+ .parse_copt = hfsc_parse_class_opt,
+ .print_copt = hfsc_print_class_opt,
+};
+
+static int
+hfsc_get_sc1(int *argcp, char ***argvp,
+ struct tc_service_curve *sc, const char *dev)
+{
+ char **argv = *argvp;
+ int argc = *argcp;
+ unsigned int m1 = 0, d = 0, m2 = 0;
+
+ if (matches(*argv, "m1") == 0) {
+ NEXT_ARG();
+ if (strchr(*argv, '%')) {
+ if (get_percent_rate(&m1, *argv, dev)) {
+ explain1("m1");
+ return -1;
+ }
+ } else if (get_rate(&m1, *argv) < 0) {
+ explain1("m1");
+ return -1;
+ }
+ NEXT_ARG();
+ }
+
+ if (matches(*argv, "d") == 0) {
+ NEXT_ARG();
+ if (get_time(&d, *argv) < 0) {
+ explain1("d");
+ return -1;
+ }
+ NEXT_ARG();
+ }
+
+ if (matches(*argv, "m2") == 0) {
+ NEXT_ARG();
+ if (strchr(*argv, '%')) {
+ if (get_percent_rate(&m2, *argv, dev)) {
+ explain1("m2");
+ return -1;
+ }
+ } else if (get_rate(&m2, *argv) < 0) {
+ explain1("m2");
+ return -1;
+ }
+ } else
+ return -1;
+
+ sc->m1 = m1;
+ sc->d = tc_core_time2ktime(d);
+ sc->m2 = m2;
+
+ *argvp = argv;
+ *argcp = argc;
+ return 0;
+}
+
+static int
+hfsc_get_sc2(int *argcp, char ***argvp, struct tc_service_curve *sc, const char *dev)
+{
+ char **argv = *argvp;
+ int argc = *argcp;
+ unsigned int umax = 0, dmax = 0, rate = 0;
+
+ if (matches(*argv, "umax") == 0) {
+ NEXT_ARG();
+ if (get_size(&umax, *argv) < 0) {
+ explain1("umax");
+ return -1;
+ }
+ NEXT_ARG();
+ }
+
+ if (matches(*argv, "dmax") == 0) {
+ NEXT_ARG();
+ if (get_time(&dmax, *argv) < 0) {
+ explain1("dmax");
+ return -1;
+ }
+ NEXT_ARG();
+ }
+
+ if (matches(*argv, "rate") == 0) {
+ NEXT_ARG();
+ if (strchr(*argv, '%')) {
+ if (get_percent_rate(&rate, *argv, dev)) {
+ explain1("rate");
+ return -1;
+ }
+ } else if (get_rate(&rate, *argv) < 0) {
+ explain1("rate");
+ return -1;
+ }
+ } else
+ return -1;
+
+ if (umax != 0 && dmax == 0) {
+ fprintf(stderr, "HFSC: umax given but dmax is zero.\n");
+ return -1;
+ }
+
+ if (dmax != 0 && ceil(1.0 * umax * TIME_UNITS_PER_SEC / dmax) > rate) {
+ /*
+ * concave curve, slope of first segment is umax/dmax,
+ * intersection is at dmax
+ */
+ sc->m1 = ceil(1.0 * umax * TIME_UNITS_PER_SEC / dmax); /* in bps */
+ sc->d = tc_core_time2ktime(dmax);
+ sc->m2 = rate;
+ } else {
+ /*
+ * convex curve, slope of first segment is 0, intersection
+ * is at dmax - umax / rate
+ */
+ sc->m1 = 0;
+ sc->d = tc_core_time2ktime(ceil(dmax - umax * TIME_UNITS_PER_SEC / rate));
+ sc->m2 = rate;
+ }
+
+ *argvp = argv;
+ *argcp = argc;
+ return 0;
+}
+
+static int
+hfsc_get_sc(int *argcp, char ***argvp, struct tc_service_curve *sc, const char *dev)
+{
+ if (hfsc_get_sc1(argcp, argvp, sc, dev) < 0 &&
+ hfsc_get_sc2(argcp, argvp, sc, dev) < 0)
+ return -1;
+
+ if (sc->m1 == 0 && sc->m2 == 0) {
+ fprintf(stderr, "HFSC: Service Curve has two zero slopes\n");
+ return -1;
+ }
+
+ return 0;
+}
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