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// 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,
};
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