linux/tools/testing/selftests/bpf/prog_tests/cpu_mask.c

// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <bpf/btf.h>
#include "bpf/libbpf_internal.h"

static int duration = 0;

static void validate_mask(int case_nr, const char *exp, bool *mask, int n)
{
	int i;

	for (i = 0; exp[i]; i++) {
		if (exp[i] == '1') {
			if (CHECK(i + 1 > n, "mask_short",
				  "case #%d: mask too short, got n=%d, need at least %d\n",
				  case_nr, n, i + 1))
				return;
			CHECK(!mask[i], "cpu_not_set",
			      "case #%d: mask differs, expected cpu#%d SET\n",
			      case_nr, i);
		} else {
			CHECK(i < n && mask[i], "cpu_set",
			      "case #%d: mask differs, expected cpu#%d UNSET\n",
			      case_nr, i);
		}
	}
	CHECK(i < n, "mask_long",
	      "case #%d: mask too long, got n=%d, expected at most %d\n",
	      case_nr, n, i);
}

static struct {
	const char *cpu_mask;
	const char *expect;
	bool fails;
} test_cases[] = {
	{ "0\n", "1", false },
	{ "0,2\n", "101", false },
	{ "0-2\n", "111", false },
	{ "0-2,3-4\n", "11111", false },
	{ "0", "1", false },
	{ "0-2", "111", false },
	{ "0,2", "101", false },
	{ "0,1-3", "1111", false },
	{ "0,1,2,3", "1111", false },
	{ "0,2-3,5", "101101", false },
	{ "3-3", "0001", false },
	{ "2-4,6,9-10", "00111010011", false },
	/* failure cases */
	{ "", "", true },
	{ "0-", "", true },
	{ "0 ", "", true },
	{ "0_1", "", true },
	{ "1-0", "", true },
	{ "-1", "", true },
};

void test_cpu_mask()
{
	int i, err, n;
	bool *mask;

	for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
		mask = NULL;
		err = parse_cpu_mask_str(test_cases[i].cpu_mask, &mask, &n);
		if (test_cases[i].fails) {
			CHECK(!err, "should_fail",
			      "case #%d: parsing should fail!\n", i + 1);
		} else {
			if (CHECK(err, "parse_err",
				  "case #%d: cpu mask parsing failed: %d\n",
				  i + 1, err))
				continue;
			validate_mask(i + 1, test_cases[i].expect, mask, n);
		}
		free(mask);
	}
}