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-rw-r--r--tc/q_ets.c337
1 files changed, 337 insertions, 0 deletions
diff --git a/tc/q_ets.c b/tc/q_ets.c
new file mode 100644
index 0000000..7380bb2
--- /dev/null
+++ b/tc/q_ets.c
@@ -0,0 +1,337 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+
+/*
+ * Enhanced Transmission Selection - 802.1Qaz-based Qdisc
+ */
+
+#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 "utils.h"
+#include "tc_util.h"
+
+static void explain(void)
+{
+ fprintf(stderr, "Usage: ... ets [bands NUMBER] [strict NUMBER] [quanta Q1 Q2...] [priomap P1 P2...]\n");
+}
+
+static void cexplain(void)
+{
+ fprintf(stderr, "Usage: ... ets [quantum Q1]\n");
+}
+
+static unsigned int parse_quantum(const char *arg)
+{
+ unsigned int quantum;
+
+ if (get_unsigned(&quantum, arg, 10)) {
+ fprintf(stderr, "Illegal \"quanta\" element\n");
+ return 0;
+ }
+ if (!quantum)
+ fprintf(stderr, "\"quanta\" must be > 0\n");
+ return quantum;
+}
+
+static int parse_nbands(const char *arg, __u8 *pnbands, const char *what)
+{
+ unsigned int tmp;
+
+ if (get_unsigned(&tmp, arg, 10)) {
+ fprintf(stderr, "Illegal \"%s\"\n", what);
+ return -1;
+ }
+ if (tmp > TCQ_ETS_MAX_BANDS) {
+ fprintf(stderr, "The number of \"%s\" must be <= %d\n",
+ what, TCQ_ETS_MAX_BANDS);
+ return -1;
+ }
+
+ *pnbands = tmp;
+ return 0;
+}
+
+static int ets_parse_opt(struct qdisc_util *qu, int argc, char **argv,
+ struct nlmsghdr *n, const char *dev)
+{
+ __u8 nbands = 0;
+ __u8 nstrict = 0;
+ bool quanta_mode = false;
+ unsigned int nquanta = 0;
+ __u32 quanta[TCQ_ETS_MAX_BANDS];
+ bool priomap_mode = false;
+ unsigned int nprio = 0;
+ __u8 priomap[TC_PRIO_MAX + 1];
+ unsigned int tmp;
+ struct rtattr *tail, *nest;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "bands") == 0) {
+ if (nbands) {
+ fprintf(stderr, "Duplicate \"bands\"\n");
+ return -1;
+ }
+ NEXT_ARG();
+ if (parse_nbands(*argv, &nbands, "bands"))
+ return -1;
+ priomap_mode = quanta_mode = false;
+ } else if (strcmp(*argv, "strict") == 0) {
+ if (nstrict) {
+ fprintf(stderr, "Duplicate \"strict\"\n");
+ return -1;
+ }
+ NEXT_ARG();
+ if (parse_nbands(*argv, &nstrict, "strict"))
+ return -1;
+ priomap_mode = quanta_mode = false;
+ } else if (strcmp(*argv, "quanta") == 0) {
+ if (nquanta) {
+ fprintf(stderr, "Duplicate \"quanta\"\n");
+ return -1;
+ }
+ NEXT_ARG();
+ priomap_mode = false;
+ quanta_mode = true;
+ goto parse_quantum;
+ } else if (strcmp(*argv, "priomap") == 0) {
+ if (nprio) {
+ fprintf(stderr, "Duplicate \"priomap\"\n");
+ return -1;
+ }
+ NEXT_ARG();
+ priomap_mode = true;
+ quanta_mode = false;
+ goto parse_priomap;
+ } else if (strcmp(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else if (quanta_mode) {
+ unsigned int quantum;
+
+parse_quantum:
+ quantum = parse_quantum(*argv);
+ if (!quantum)
+ return -1;
+ quanta[nquanta++] = quantum;
+ } else if (priomap_mode) {
+ unsigned int band;
+
+parse_priomap:
+ if (get_unsigned(&band, *argv, 10)) {
+ fprintf(stderr, "Illegal \"priomap\" element\n");
+ return -1;
+ }
+ if (nprio > TC_PRIO_MAX) {
+ fprintf(stderr, "\"priomap\" index cannot be higher than %u\n", TC_PRIO_MAX);
+ return -1;
+ }
+ priomap[nprio++] = band;
+ } else {
+ fprintf(stderr, "What is \"%s\"?\n", *argv);
+ explain();
+ return -1;
+ }
+ argc--; argv++;
+ }
+
+ if (!nbands)
+ nbands = nquanta + nstrict;
+ if (!nbands) {
+ fprintf(stderr, "One of \"bands\", \"quanta\" or \"strict\" needs to be specified\n");
+ explain();
+ return -1;
+ }
+ if (nstrict + nquanta > nbands) {
+ fprintf(stderr, "Not enough total bands to cover all the strict bands and quanta\n");
+ explain();
+ return -1;
+ }
+ for (tmp = 0; tmp < nprio; tmp++) {
+ if (priomap[tmp] >= nbands) {
+ fprintf(stderr, "\"priomap\" element is out of bounds\n");
+ return -1;
+ }
+ }
+
+ tail = addattr_nest(n, 1024, TCA_OPTIONS | NLA_F_NESTED);
+ addattr_l(n, 1024, TCA_ETS_NBANDS, &nbands, sizeof(nbands));
+ if (nstrict)
+ addattr_l(n, 1024, TCA_ETS_NSTRICT, &nstrict, sizeof(nstrict));
+ if (nquanta) {
+ nest = addattr_nest(n, 1024, TCA_ETS_QUANTA | NLA_F_NESTED);
+ for (tmp = 0; tmp < nquanta; tmp++)
+ addattr_l(n, 1024, TCA_ETS_QUANTA_BAND,
+ &quanta[tmp], sizeof(quanta[0]));
+ addattr_nest_end(n, nest);
+ }
+ if (nprio) {
+ nest = addattr_nest(n, 1024, TCA_ETS_PRIOMAP | NLA_F_NESTED);
+ for (tmp = 0; tmp < nprio; tmp++)
+ addattr_l(n, 1024, TCA_ETS_PRIOMAP_BAND,
+ &priomap[tmp], sizeof(priomap[0]));
+ addattr_nest_end(n, nest);
+ }
+ addattr_nest_end(n, tail);
+
+ return 0;
+}
+
+static int ets_parse_copt(struct qdisc_util *qu, int argc, char **argv,
+ struct nlmsghdr *n, const char *dev)
+{
+ unsigned int quantum = 0;
+ struct rtattr *tail;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "quantum") == 0) {
+ if (quantum) {
+ fprintf(stderr, "Duplicate \"quantum\"\n");
+ return -1;
+ }
+ NEXT_ARG();
+ quantum = parse_quantum(*argv);
+ if (!quantum)
+ return -1;
+ } else if (strcmp(*argv, "help") == 0) {
+ cexplain();
+ return -1;
+ } else {
+ fprintf(stderr, "What is \"%s\"?\n", *argv);
+ cexplain();
+ return -1;
+ }
+ argc--; argv++;
+ }
+
+ tail = addattr_nest(n, 1024, TCA_OPTIONS | NLA_F_NESTED);
+ if (quantum)
+ addattr_l(n, 1024, TCA_ETS_QUANTA_BAND, &quantum,
+ sizeof(quantum));
+ addattr_nest_end(n, tail);
+
+ return 0;
+}
+
+static int ets_print_opt_quanta(struct rtattr *opt)
+{
+ int len = RTA_PAYLOAD(opt);
+ unsigned int offset;
+
+ open_json_array(PRINT_ANY, "quanta");
+ for (offset = 0; offset < len; ) {
+ struct rtattr *tb[TCA_ETS_MAX + 1] = {NULL};
+ struct rtattr *attr;
+ __u32 quantum;
+
+ attr = RTA_DATA(opt) + offset;
+ parse_rtattr(tb, TCA_ETS_MAX, attr, len - offset);
+ offset += RTA_LENGTH(RTA_PAYLOAD(attr));
+
+ if (!tb[TCA_ETS_QUANTA_BAND]) {
+ fprintf(stderr, "No ETS band quantum\n");
+ return -1;
+ }
+
+ quantum = rta_getattr_u32(tb[TCA_ETS_QUANTA_BAND]);
+ print_uint(PRINT_ANY, NULL, " %u", quantum);
+
+ }
+ close_json_array(PRINT_ANY, " ");
+
+ return 0;
+}
+
+static int ets_print_opt_priomap(struct rtattr *opt)
+{
+ int len = RTA_PAYLOAD(opt);
+ unsigned int offset;
+
+ open_json_array(PRINT_ANY, "priomap");
+ for (offset = 0; offset < len; ) {
+ struct rtattr *tb[TCA_ETS_MAX + 1] = {NULL};
+ struct rtattr *attr;
+ __u8 band;
+
+ attr = RTA_DATA(opt) + offset;
+ parse_rtattr(tb, TCA_ETS_MAX, attr, len - offset);
+ offset += RTA_LENGTH(RTA_PAYLOAD(attr)) + 3 /* padding */;
+
+ if (!tb[TCA_ETS_PRIOMAP_BAND]) {
+ fprintf(stderr, "No ETS priomap band\n");
+ return -1;
+ }
+
+ band = rta_getattr_u8(tb[TCA_ETS_PRIOMAP_BAND]);
+ print_uint(PRINT_ANY, NULL, " %u", band);
+
+ }
+ close_json_array(PRINT_ANY, " ");
+
+ return 0;
+}
+
+static int ets_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+ struct rtattr *tb[TCA_ETS_MAX + 1];
+ __u8 nbands;
+ __u8 nstrict;
+ int err;
+
+ if (opt == NULL)
+ return 0;
+
+ parse_rtattr_nested(tb, TCA_ETS_MAX, opt);
+
+ if (!tb[TCA_ETS_NBANDS] || !tb[TCA_ETS_PRIOMAP]) {
+ fprintf(stderr, "Incomplete ETS options\n");
+ return -1;
+ }
+
+ nbands = rta_getattr_u8(tb[TCA_ETS_NBANDS]);
+ print_uint(PRINT_ANY, "bands", "bands %u ", nbands);
+
+ if (tb[TCA_ETS_NSTRICT]) {
+ nstrict = rta_getattr_u8(tb[TCA_ETS_NSTRICT]);
+ print_uint(PRINT_ANY, "strict", "strict %u ", nstrict);
+ }
+
+ if (tb[TCA_ETS_QUANTA]) {
+ err = ets_print_opt_quanta(tb[TCA_ETS_QUANTA]);
+ if (err)
+ return err;
+ }
+
+ return ets_print_opt_priomap(tb[TCA_ETS_PRIOMAP]);
+}
+
+static int ets_print_copt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+ struct rtattr *tb[TCA_ETS_MAX + 1];
+ __u32 quantum;
+
+ if (opt == NULL)
+ return 0;
+
+ parse_rtattr_nested(tb, TCA_ETS_MAX, opt);
+
+ if (tb[TCA_ETS_QUANTA_BAND]) {
+ quantum = rta_getattr_u32(tb[TCA_ETS_QUANTA_BAND]);
+ print_uint(PRINT_ANY, "quantum", "quantum %u ", quantum);
+ }
+
+ return 0;
+}
+
+struct qdisc_util ets_qdisc_util = {
+ .id = "ets",
+ .parse_qopt = ets_parse_opt,
+ .parse_copt = ets_parse_copt,
+ .print_qopt = ets_print_opt,
+ .print_copt = ets_print_copt,
+};