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2024-05-10 23fa18eaa71266feff7ba8d83022d9e1cc83c65a 
 kernel/samples/bpf/map_perf_test_user.c
....@@ -1,8 +1,5 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /* Copyright (c) 2016 Facebook
2
- *
3
- * This program is free software; you can redistribute it and/or
4
- * modify it under the terms of version 2 of the GNU General Public
5
- * License as published by the Free Software Foundation.
63  */
74 #define _GNU_SOURCE
85 #include <sched.h>
....@@ -14,7 +11,6 @@
1411 #include <sys/wait.h>
1512 #include <stdlib.h>
1613 #include <signal.h>
17
-#include <linux/bpf.h>
1814 #include <string.h>
1915 #include <time.h>
2016 #include <sys/resource.h>
....@@ -22,7 +18,7 @@
2218 #include <errno.h>
2319 
2420 #include <bpf/bpf.h>
25
-#include "bpf_load.h"
21
+#include <bpf/libbpf.h>
2622 
2723 #define TEST_BIT(t) (1U << (t))
2824 #define MAX_NR_CPUS 1024
....@@ -64,12 +60,18 @@
6460 	[LRU_HASH_LOOKUP] = "lru_hash_lookup_map",
6561 };
6662 
63
+enum map_idx {
64
+	array_of_lru_hashs_idx,
65
+	hash_map_alloc_idx,
66
+	lru_hash_lookup_idx,
67
+	NR_IDXES,
68
+};
69
+
70
+static int map_fd[NR_IDXES];
71
+
6772 static int test_flags = ~0;
6873 static uint32_t num_map_entries;
6974 static uint32_t inner_lru_hash_size;
70
-static int inner_lru_hash_idx = -1;
71
-static int array_of_lru_hashs_idx = -1;
72
-static int lru_hash_lookup_idx = -1;
7375 static int lru_hash_lookup_test_entries = 32;
7476 static uint32_t max_cnt = 1000000;
7577 
....@@ -125,30 +127,30 @@
125127 	__u64 start_time;
126128 	int i, ret;
127129 
128
-	if (test == INNER_LRU_HASH_PREALLOC) {
130
+	if (test == INNER_LRU_HASH_PREALLOC && cpu) {
131
+		/* If CPU is not 0, create inner_lru hash map and insert the fd
132
+		 * value into the array_of_lru_hash map. In case of CPU 0,
133
+		 * 'inner_lru_hash_map' was statically inserted on the map init
134
+		 */
129135 		int outer_fd = map_fd[array_of_lru_hashs_idx];
130136 		unsigned int mycpu, mynode;
131137 
132138 		assert(cpu < MAX_NR_CPUS);
133139 
134
-		if (cpu) {
135
-			ret = syscall(__NR_getcpu, &mycpu, &mynode, NULL);
136
-			assert(!ret);
140
+		ret = syscall(__NR_getcpu, &mycpu, &mynode, NULL);
141
+		assert(!ret);
137142 
138
-			inner_lru_map_fds[cpu] =
139
-				bpf_create_map_node(BPF_MAP_TYPE_LRU_HASH,
140
-						    test_map_names[INNER_LRU_HASH_PREALLOC],
141
-						    sizeof(uint32_t),
142
-						    sizeof(long),
143
-						    inner_lru_hash_size, 0,
144
-						    mynode);
145
-			if (inner_lru_map_fds[cpu] == -1) {
146
-				printf("cannot create BPF_MAP_TYPE_LRU_HASH %s(%d)\n",
147
-				       strerror(errno), errno);
148
-				exit(1);
149
-			}
150
-		} else {
151
-			inner_lru_map_fds[cpu] = map_fd[inner_lru_hash_idx];
143
+		inner_lru_map_fds[cpu] =
144
+			bpf_create_map_node(BPF_MAP_TYPE_LRU_HASH,
145
+					    test_map_names[INNER_LRU_HASH_PREALLOC],
146
+					    sizeof(uint32_t),
147
+					    sizeof(long),
148
+					    inner_lru_hash_size, 0,
149
+					    mynode);
150
+		if (inner_lru_map_fds[cpu] == -1) {
151
+			printf("cannot create BPF_MAP_TYPE_LRU_HASH %s(%d)\n",
152
+			       strerror(errno), errno);
153
+			exit(1);
152154 		}
153155 
154156 		ret = bpf_map_update_elem(outer_fd, &cpu,
....@@ -380,7 +382,8 @@
380382 		key->data[1] = rand() & 0xff;
381383 		key->data[2] = rand() & 0xff;
382384 		key->data[3] = rand() & 0xff;
383
-		r = bpf_map_update_elem(map_fd[6], key, &value, 0);
385
+		r = bpf_map_update_elem(map_fd[hash_map_alloc_idx],
386
+					key, &value, 0);
384387 		assert(!r);
385388 	}
386389 
....@@ -391,59 +394,52 @@
391394 	key->data[3] = 1;
392395 	value = 128;
393396 
394
-	r = bpf_map_update_elem(map_fd[6], key, &value, 0);
397
+	r = bpf_map_update_elem(map_fd[hash_map_alloc_idx], key, &value, 0);
395398 	assert(!r);
396399 }
397400 
398
-static void fixup_map(struct bpf_map_data *map, int idx)
401
+static void fixup_map(struct bpf_object *obj)
399402 {
403
+	struct bpf_map *map;
400404 	int i;
401405 
402
-	if (!strcmp("inner_lru_hash_map", map->name)) {
403
-		inner_lru_hash_idx = idx;
404
-		inner_lru_hash_size = map->def.max_entries;
405
-	}
406
+	bpf_object__for_each_map(map, obj) {
407
+		const char *name = bpf_map__name(map);
406408 
407
-	if (!strcmp("array_of_lru_hashs", map->name)) {
408
-		if (inner_lru_hash_idx == -1) {
409
-			printf("inner_lru_hash_map must be defined before array_of_lru_hashs\n");
410
-			exit(1);
409
+		/* Only change the max_entries for the enabled test(s) */
410
+		for (i = 0; i < NR_TESTS; i++) {
411
+			if (!strcmp(test_map_names[i], name) &&
412
+			    (check_test_flags(i))) {
413
+				bpf_map__resize(map, num_map_entries);
414
+				continue;
415
+			}
411416 		}
412
-		map->def.inner_map_idx = inner_lru_hash_idx;
413
-		array_of_lru_hashs_idx = idx;
414417 	}
415
-
416
-	if (!strcmp("lru_hash_lookup_map", map->name))
417
-		lru_hash_lookup_idx = idx;
418
-
419
-	if (num_map_entries <= 0)
420
-		return;
421418 
422419 	inner_lru_hash_size = num_map_entries;
423
-
424
-	/* Only change the max_entries for the enabled test(s) */
425
-	for (i = 0; i < NR_TESTS; i++) {
426
-		if (!strcmp(test_map_names[i], map->name) &&
427
-		    (check_test_flags(i))) {
428
-			map->def.max_entries = num_map_entries;
429
-		}
430
-	}
431420 }
432421 
433422 int main(int argc, char **argv)
434423 {
435424 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
425
+	int nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
426
+	struct bpf_link *links[8];
427
+	struct bpf_program *prog;
428
+	struct bpf_object *obj;
429
+	struct bpf_map *map;
436430 	char filename[256];
437
-	int num_cpu = 8;
431
+	int i = 0;
438432 
439
-	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
440
-	setrlimit(RLIMIT_MEMLOCK, &r);
433
+	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
434
+		perror("setrlimit(RLIMIT_MEMLOCK)");
435
+		return 1;
436
+	}
441437 
442438 	if (argc > 1)
443439 		test_flags = atoi(argv[1]) ? : test_flags;
444440 
445441 	if (argc > 2)
446
-		num_cpu = atoi(argv[2]) ? : num_cpu;
442
+		nr_cpus = atoi(argv[2]) ? : nr_cpus;
447443 
448444 	if (argc > 3)
449445 		num_map_entries = atoi(argv[3]);
....@@ -451,14 +447,61 @@
451447 	if (argc > 4)
452448 		max_cnt = atoi(argv[4]);
453449 
454
-	if (load_bpf_file_fixup_map(filename, fixup_map)) {
455
-		printf("%s", bpf_log_buf);
456
-		return 1;
450
+	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
451
+	obj = bpf_object__open_file(filename, NULL);
452
+	if (libbpf_get_error(obj)) {
453
+		fprintf(stderr, "ERROR: opening BPF object file failed\n");
454
+		return 0;
455
+	}
456
+
457
+	map = bpf_object__find_map_by_name(obj, "inner_lru_hash_map");
458
+	if (libbpf_get_error(map)) {
459
+		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
460
+		goto cleanup;
461
+	}
462
+
463
+	inner_lru_hash_size = bpf_map__max_entries(map);
464
+	if (!inner_lru_hash_size) {
465
+		fprintf(stderr, "ERROR: failed to get map attribute\n");
466
+		goto cleanup;
467
+	}
468
+
469
+	/* resize BPF map prior to loading */
470
+	if (num_map_entries > 0)
471
+		fixup_map(obj);
472
+
473
+	/* load BPF program */
474
+	if (bpf_object__load(obj)) {
475
+		fprintf(stderr, "ERROR: loading BPF object file failed\n");
476
+		goto cleanup;
477
+	}
478
+
479
+	map_fd[0] = bpf_object__find_map_fd_by_name(obj, "array_of_lru_hashs");
480
+	map_fd[1] = bpf_object__find_map_fd_by_name(obj, "hash_map_alloc");
481
+	map_fd[2] = bpf_object__find_map_fd_by_name(obj, "lru_hash_lookup_map");
482
+	if (map_fd[0] < 0 || map_fd[1] < 0 || map_fd[2] < 0) {
483
+		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
484
+		goto cleanup;
485
+	}
486
+
487
+	bpf_object__for_each_program(prog, obj) {
488
+		links[i] = bpf_program__attach(prog);
489
+		if (libbpf_get_error(links[i])) {
490
+			fprintf(stderr, "ERROR: bpf_program__attach failed\n");
491
+			links[i] = NULL;
492
+			goto cleanup;
493
+		}
494
+		i++;
457495 	}
458496 
459497 	fill_lpm_trie();
460498 
461
-	run_perf_test(num_cpu);
499
+	run_perf_test(nr_cpus);
462500 
501
+cleanup:
502
+	for (i--; i >= 0; i--)
503
+		bpf_link__destroy(links[i]);
504
+
505
+	bpf_object__close(obj);
463506 	return 0;
464507 }