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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* m_sample.c ingress/egress packet sampling module
*
* Authors: Yotam Gigi <yotamg@mellanox.com>
*/
#include <stdio.h>
#include "utils.h"
#include "tc_util.h"
#include "tc_common.h"
#include <linux/tc_act/tc_sample.h>
static void explain(void)
{
fprintf(stderr,
"Usage: sample SAMPLE_CONF\n"
"where:\n"
"\tSAMPLE_CONF := SAMPLE_PARAMS | SAMPLE_INDEX\n"
"\tSAMPLE_PARAMS := rate RATE group GROUP [trunc SIZE] [SAMPLE_INDEX]\n"
"\tSAMPLE_INDEX := index INDEX\n"
"\tRATE := The ratio of packets observed at the data source to the samples generated.\n"
"\tGROUP := the psample sampling group\n"
"\tSIZE := the truncation size\n"
"\tINDEX := integer index of the sample action\n");
}
static void usage(void)
{
explain();
exit(-1);
}
static int parse_sample(struct action_util *a, int *argc_p, char ***argv_p,
int tca_id, struct nlmsghdr *n)
{
struct tc_sample p = { 0 };
bool trunc_set = false;
bool group_set = false;
bool rate_set = false;
char **argv = *argv_p;
struct rtattr *tail;
int argc = *argc_p;
__u32 trunc;
__u32 group;
__u32 rate;
if (argc <= 1) {
fprintf(stderr, "sample bad argument count %d\n", argc);
usage();
return -1;
}
if (matches(*argv, "sample") == 0) {
NEXT_ARG();
} else {
fprintf(stderr, "sample bad argument %s\n", *argv);
return -1;
}
while (argc > 0) {
if (matches(*argv, "rate") == 0) {
NEXT_ARG();
if (get_u32(&rate, *argv, 10) != 0) {
fprintf(stderr, "Illegal rate %s\n", *argv);
usage();
return -1;
}
rate_set = true;
} else if (matches(*argv, "group") == 0) {
NEXT_ARG();
if (get_u32(&group, *argv, 10) != 0) {
fprintf(stderr, "Illegal group num %s\n",
*argv);
usage();
return -1;
}
group_set = true;
} else if (matches(*argv, "trunc") == 0) {
NEXT_ARG();
if (get_u32(&trunc, *argv, 10) != 0) {
fprintf(stderr, "Illegal truncation size %s\n",
*argv);
usage();
return -1;
}
trunc_set = true;
} else if (matches(*argv, "help") == 0) {
usage();
} else {
break;
}
NEXT_ARG_FWD();
}
parse_action_control_dflt(&argc, &argv, &p.action, false, TC_ACT_PIPE);
if (argc) {
if (matches(*argv, "index") == 0) {
NEXT_ARG();
if (get_u32(&p.index, *argv, 10)) {
fprintf(stderr, "sample: Illegal \"index\"\n");
return -1;
}
NEXT_ARG_FWD();
}
}
if (!p.index && !group_set) {
fprintf(stderr, "param \"group\" not set\n");
usage();
}
if (!p.index && !rate_set) {
fprintf(stderr, "param \"rate\" not set\n");
usage();
}
tail = addattr_nest(n, MAX_MSG, tca_id);
addattr_l(n, MAX_MSG, TCA_SAMPLE_PARMS, &p, sizeof(p));
if (rate_set)
addattr32(n, MAX_MSG, TCA_SAMPLE_RATE, rate);
if (group_set)
addattr32(n, MAX_MSG, TCA_SAMPLE_PSAMPLE_GROUP, group);
if (trunc_set)
addattr32(n, MAX_MSG, TCA_SAMPLE_TRUNC_SIZE, trunc);
addattr_nest_end(n, tail);
*argc_p = argc;
*argv_p = argv;
return 0;
}
static int print_sample(struct action_util *au, FILE *f, struct rtattr *arg)
{
struct rtattr *tb[TCA_SAMPLE_MAX + 1];
struct tc_sample *p;
print_string(PRINT_ANY, "kind", "%s ", "sample");
if (arg == NULL)
return 0;
parse_rtattr_nested(tb, TCA_SAMPLE_MAX, arg);
if (!tb[TCA_SAMPLE_PARMS] || !tb[TCA_SAMPLE_RATE] ||
!tb[TCA_SAMPLE_PSAMPLE_GROUP]) {
fprintf(stderr, "Missing sample parameters\n");
return -1;
}
p = RTA_DATA(tb[TCA_SAMPLE_PARMS]);
print_uint(PRINT_ANY, "rate", "rate 1/%u ",
rta_getattr_u32(tb[TCA_SAMPLE_RATE]));
print_uint(PRINT_ANY, "group", "group %u",
rta_getattr_u32(tb[TCA_SAMPLE_PSAMPLE_GROUP]));
if (tb[TCA_SAMPLE_TRUNC_SIZE])
print_uint(PRINT_ANY, "trunc_size", " trunc_size %u",
rta_getattr_u32(tb[TCA_SAMPLE_TRUNC_SIZE]));
print_action_control(f, " ", p->action, "");
print_nl();
print_uint(PRINT_ANY, "index", "\t index %u", p->index);
print_int(PRINT_ANY, "ref", " ref %d", p->refcnt);
print_int(PRINT_ANY, "bind", " bind %d", p->bindcnt);
if (show_stats) {
if (tb[TCA_SAMPLE_TM]) {
struct tcf_t *tm = RTA_DATA(tb[TCA_SAMPLE_TM]);
print_tm(f, tm);
}
}
print_nl();
return 0;
}
struct action_util sample_action_util = {
.id = "sample",
.parse_aopt = parse_sample,
.print_aopt = print_sample,
};
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