Merge branch 'bpf: RLIMIT_MEMLOCK cleanups'

Yafang Shao says:

====================

We have switched to memcg-based memory accouting and thus the rlimit is
not needed any more. LIBBPF_STRICT_AUTO_RLIMIT_MEMLOCK was introduced in
libbpf for backward compatibility, so we can use it instead now.

This patchset cleanups the usage of RLIMIT_MEMLOCK in tools/bpf/,
tools/testing/selftests/bpf and samples/bpf. The file
tools/testing/selftests/bpf/bpf_rlimit.h is removed. The included header
sys/resource.h is removed from many files as it is useless in these files.

- v4: Squash patches and use customary subject prefixes. (Andrii)
- v3: Get rid of bpf_rlimit.h and fix some typos (Andrii)
- v2: Use libbpf_set_strict_mode instead. (Andrii)
- v1: https://lore.kernel.org/bpf/20220320060815.7716-2-laoar.shao@gmail.com/
====================
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

samples/bpf/cpustat_user.c

@@ -13,7 +13,6 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/time.h>
-#include <sys/resource.h>
 #include <sys/wait.h>
 
 #include <bpf/bpf.h>

samples/bpf/hbm.c

@@ -34,7 +34,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>
-#include <sys/resource.h>
 #include <sys/time.h>
 #include <unistd.h>
 #include <errno.h>
@@ -46,7 +45,6 @@
 #include <bpf/bpf.h>
 #include <getopt.h>
 
-#include "bpf_rlimit.h"
 #include "cgroup_helpers.h"
 #include "hbm.h"
 #include "bpf_util.h"
@@ -510,5 +508,8 @@ int main(int argc, char **argv)
 		prog = argv[optind];
 	printf("HBM prog: %s\n", prog != NULL ? prog : "NULL");
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	return run_bpf_prog(prog, cg_id);
 }

samples/bpf/ibumad_user.c

@@ -19,7 +19,6 @@
 #include <sys/types.h>
 #include <limits.h>
 
-#include <sys/resource.h>
 #include <getopt.h>
 #include <net/if.h>
 

samples/bpf/map_perf_test_user.c

@@ -13,7 +13,6 @@
 #include <signal.h>
 #include <string.h>
 #include <time.h>
-#include <sys/resource.h>
 #include <arpa/inet.h>
 #include <errno.h>
 

samples/bpf/offwaketime_user.c

@@ -8,7 +8,6 @@
 #include <linux/perf_event.h>
 #include <errno.h>
 #include <stdbool.h>
-#include <sys/resource.h>
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
 #include "trace_helpers.h"

samples/bpf/sockex2_user.c

@@ -7,7 +7,6 @@
 #include "sock_example.h"
 #include <unistd.h>
 #include <arpa/inet.h>
-#include <sys/resource.h>
 
 struct pair {
 	__u64 packets;

samples/bpf/sockex3_user.c

@@ -6,7 +6,6 @@
 #include "sock_example.h"
 #include <unistd.h>
 #include <arpa/inet.h>
-#include <sys/resource.h>
 
 struct flow_key_record {
 	__be32 src;

samples/bpf/spintest_user.c

@@ -3,7 +3,6 @@
 #include <unistd.h>
 #include <string.h>
 #include <assert.h>
-#include <sys/resource.h>
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
 #include "trace_helpers.h"

samples/bpf/syscall_tp_user.c

@@ -8,7 +8,6 @@
 #include <string.h>
 #include <linux/perf_event.h>
 #include <errno.h>
-#include <sys/resource.h>
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
 

samples/bpf/task_fd_query_user.c

@@ -10,7 +10,6 @@
 #include <fcntl.h>
 #include <linux/bpf.h>
 #include <sys/ioctl.h>
-#include <sys/resource.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <linux/perf_event.h>

samples/bpf/test_lru_dist.c

@@ -13,7 +13,6 @@
 #include <sched.h>
 #include <sys/wait.h>
 #include <sys/stat.h>
-#include <sys/resource.h>
 #include <fcntl.h>
 #include <stdlib.h>
 #include <time.h>

samples/bpf/test_map_in_map_user.c

@@ -2,7 +2,6 @@
 /*
  * Copyright (c) 2017 Facebook
  */
-#include <sys/resource.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <stdint.h>

samples/bpf/test_overhead_user.c

@@ -16,7 +16,6 @@
 #include <linux/bpf.h>
 #include <string.h>
 #include <time.h>
-#include <sys/resource.h>
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
 

samples/bpf/tracex2_user.c

@@ -4,7 +4,6 @@
 #include <stdlib.h>
 #include <signal.h>
 #include <string.h>
-#include <sys/resource.h>
 
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>

samples/bpf/tracex3_user.c

@@ -7,7 +7,6 @@
 #include <unistd.h>
 #include <stdbool.h>
 #include <string.h>
-#include <sys/resource.h>
 
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>

samples/bpf/tracex4_user.c

@@ -8,7 +8,6 @@
 #include <stdbool.h>
 #include <string.h>
 #include <time.h>
-#include <sys/resource.h>
 
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>

samples/bpf/tracex5_user.c

@@ -7,7 +7,6 @@
 #include <sys/prctl.h>
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
-#include <sys/resource.h>
 #include "trace_helpers.h"
 
 #ifdef __mips__

samples/bpf/tracex6_user.c

@@ -8,7 +8,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/ioctl.h>
-#include <sys/resource.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/wait.h>

samples/bpf/xdp1_user.c

@@ -11,7 +11,6 @@
 #include <string.h>
 #include <unistd.h>
 #include <libgen.h>
-#include <sys/resource.h>
 #include <net/if.h>
 
 #include "bpf_util.h"

samples/bpf/xdp_adjust_tail_user.c

@@ -14,7 +14,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <net/if.h>
-#include <sys/resource.h>
 #include <arpa/inet.h>
 #include <netinet/ether.h>
 #include <unistd.h>

samples/bpf/xdp_monitor_user.c

@@ -17,7 +17,6 @@ static const char *__doc_err_only__=
 #include <ctype.h>
 #include <unistd.h>
 #include <locale.h>
-#include <sys/resource.h>
 #include <getopt.h>
 #include <net/if.h>
 #include <time.h>

samples/bpf/xdp_redirect_cpu_user.c

@@ -21,7 +21,6 @@ static const char *__doc__ =
 #include <string.h>
 #include <unistd.h>
 #include <locale.h>
-#include <sys/resource.h>
 #include <sys/sysinfo.h>
 #include <getopt.h>
 #include <net/if.h>

samples/bpf/xdp_redirect_map_multi_user.c

@@ -15,7 +15,6 @@ static const char *__doc__ =
 #include <net/if.h>
 #include <unistd.h>
 #include <libgen.h>
-#include <sys/resource.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/socket.h>

samples/bpf/xdp_redirect_user.c

@@ -18,7 +18,6 @@ static const char *__doc__ =
 #include <unistd.h>
 #include <libgen.h>
 #include <getopt.h>
-#include <sys/resource.h>
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
 #include "bpf_util.h"

samples/bpf/xdp_router_ipv4_user.c

@@ -22,7 +22,6 @@
 #include <sys/syscall.h>
 #include "bpf_util.h"
 #include <bpf/libbpf.h>
-#include <sys/resource.h>
 #include <libgen.h>
 #include <getopt.h>
 #include <pthread.h>

samples/bpf/xdp_rxq_info_user.c

@@ -14,7 +14,6 @@ static const char *__doc__ = " XDP RX-queue info extract example\n\n"
 #include <string.h>
 #include <unistd.h>
 #include <locale.h>
-#include <sys/resource.h>
 #include <getopt.h>
 #include <net/if.h>
 #include <time.h>

samples/bpf/xdp_sample_pkts_user.c

@@ -12,7 +12,6 @@
 #include <signal.h>
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
-#include <sys/resource.h>
 #include <libgen.h>
 #include <linux/if_link.h>
 

samples/bpf/xdp_sample_user.c

@@ -25,7 +25,6 @@
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
-#include <sys/resource.h>
 #include <sys/signalfd.h>
 #include <sys/sysinfo.h>
 #include <sys/timerfd.h>

samples/bpf/xdp_tx_iptunnel_user.c

@@ -10,7 +10,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <net/if.h>
-#include <sys/resource.h>
 #include <arpa/inet.h>
 #include <netinet/ether.h>
 #include <unistd.h>

samples/bpf/xdpsock_user.c

@@ -25,7 +25,6 @@
 #include <string.h>
 #include <sys/capability.h>
 #include <sys/mman.h>
-#include <sys/resource.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <sys/un.h>
@@ -1886,7 +1885,6 @@ int main(int argc, char **argv)
 {
 	struct __user_cap_header_struct hdr = { _LINUX_CAPABILITY_VERSION_3, 0 };
 	struct __user_cap_data_struct data[2] = { { 0 } };
-	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 	bool rx = false, tx = false;
 	struct sched_param schparam;
 	struct xsk_umem_info *umem;
@@ -1917,11 +1915,8 @@ int main(int argc, char **argv)
 				data[1].effective, data[1].inheritable, data[1].permitted);
 		}
 	} else {
-		if (setrlimit(RLIMIT_MEMLOCK, &r)) {
-			fprintf(stderr, "ERROR: setrlimit(RLIMIT_MEMLOCK) \"%s\"\n",
-				strerror(errno));
-			exit(EXIT_FAILURE);
-		}
+		/* Use libbpf 1.0 API mode */
+		libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
 
 		if (opt_num_xsks > 1)
 			load_xdp_program(argv, &obj);

samples/bpf/xsk_fwd.c

@@ -10,7 +10,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
-#include <sys/resource.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <time.h>
@@ -131,7 +130,6 @@ static struct bpool *
 bpool_init(struct bpool_params *params,
 	   struct xsk_umem_config *umem_cfg)
 {
-	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 	u64 n_slabs, n_slabs_reserved, n_buffers, n_buffers_reserved;
 	u64 slabs_size, slabs_reserved_size;
 	u64 buffers_size, buffers_reserved_size;
@@ -140,9 +138,8 @@ bpool_init(struct bpool_params *params,
 	u8 *p;
 	int status;
 
-	/* mmap prep. */
-	if (setrlimit(RLIMIT_MEMLOCK, &r))
-		return NULL;
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
 
 	/* bpool internals dimensioning. */
 	n_slabs = (params->n_buffers + params->n_buffers_per_slab - 1) /

tools/bpf/bpftool/common.c

@@ -17,7 +17,6 @@
 #include <linux/magic.h>
 #include <net/if.h>
 #include <sys/mount.h>
-#include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/vfs.h>
 
@@ -119,13 +118,6 @@ static bool is_bpffs(char *path)
 	return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
 }
 
-void set_max_rlimit(void)
-{
-	struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
-
-	setrlimit(RLIMIT_MEMLOCK, &rinf);
-}
-
 static int
 mnt_fs(const char *target, const char *type, char *buff, size_t bufflen)
 {

tools/bpf/bpftool/feature.c

@@ -1136,8 +1136,6 @@ static int do_probe(int argc, char **argv)
 	__u32 ifindex = 0;
 	char *ifname;
 
-	set_max_rlimit();
-
 	while (argc) {
 		if (is_prefix(*argv, "kernel")) {
 			if (target != COMPONENT_UNSPEC) {

tools/bpf/bpftool/main.c

@@ -507,9 +507,9 @@ int main(int argc, char **argv)
 		 * It will still be rejected if users use LIBBPF_STRICT_ALL
 		 * mode for loading generated skeleton.
 		 */
-		ret = libbpf_set_strict_mode(LIBBPF_STRICT_ALL & ~LIBBPF_STRICT_MAP_DEFINITIONS);
-		if (ret)
-			p_err("failed to enable libbpf strict mode: %d", ret);
+		libbpf_set_strict_mode(LIBBPF_STRICT_ALL & ~LIBBPF_STRICT_MAP_DEFINITIONS);
+	} else {
+		libbpf_set_strict_mode(LIBBPF_STRICT_AUTO_RLIMIT_MEMLOCK);
 	}
 
 	argc -= optind;

tools/bpf/bpftool/main.h

@@ -102,8 +102,6 @@ int detect_common_prefix(const char *arg, ...);
 void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep);
 void usage(void) __noreturn;
 
-void set_max_rlimit(void);
-
 int mount_tracefs(const char *target);
 
 struct obj_ref {

tools/bpf/bpftool/map.c

@@ -1342,8 +1342,6 @@ static int do_create(int argc, char **argv)
 		goto exit;
 	}
 
-	set_max_rlimit();
-
 	fd = bpf_map_create(map_type, map_name, key_size, value_size, max_entries, &attr);
 	if (fd < 0) {
 		p_err("map create failed: %s", strerror(errno));

tools/bpf/bpftool/pids.c

@@ -108,7 +108,6 @@ int build_obj_refs_table(struct hashmap **map, enum bpf_obj_type type)
 		p_err("failed to create hashmap for PID references");
 		return -1;
 	}
-	set_max_rlimit();
 
 	skel = pid_iter_bpf__open();
 	if (!skel) {

tools/bpf/bpftool/prog.c

@@ -1604,8 +1604,6 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
 		}
 	}
 
-	set_max_rlimit();
-
 	if (verifier_logs)
 		/* log_level1 + log_level2 + stats, but not stable UAPI */
 		open_opts.kernel_log_level = 1 + 2 + 4;
@@ -2303,7 +2301,6 @@ static int do_profile(int argc, char **argv)
 		}
 	}
 
-	set_max_rlimit();
 	err = profiler_bpf__load(profile_obj);
 	if (err) {
 		p_err("failed to load profile_obj");

tools/bpf/bpftool/struct_ops.c

@@ -501,8 +501,6 @@ static int do_register(int argc, char **argv)
 	if (libbpf_get_error(obj))
 		return -1;
 
-	set_max_rlimit();
-
 	if (bpf_object__load(obj)) {
 		bpf_object__close(obj);
 		return -1;

tools/bpf/runqslower/runqslower.c

@@ -4,7 +4,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/resource.h>
 #include <time.h>
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
@@ -88,16 +87,6 @@ int libbpf_print_fn(enum libbpf_print_level level,
 	return vfprintf(stderr, format, args);
 }
 
-static int bump_memlock_rlimit(void)
-{
-	struct rlimit rlim_new = {
-		.rlim_cur	= RLIM_INFINITY,
-		.rlim_max	= RLIM_INFINITY,
-	};
-
-	return setrlimit(RLIMIT_MEMLOCK, &rlim_new);
-}
-
 void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)
 {
 	const struct runq_event *e = data;
@@ -133,11 +122,8 @@ int main(int argc, char **argv)
 
 	libbpf_set_print(libbpf_print_fn);
 
-	err = bump_memlock_rlimit();
-	if (err) {
-		fprintf(stderr, "failed to increase rlimit: %d", err);
-		return 1;
-	}
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
 
 	obj = runqslower_bpf__open();
 	if (!obj) {

tools/testing/selftests/bpf/bench.c

@@ -8,7 +8,6 @@
 #include <fcntl.h>
 #include <pthread.h>
 #include <sys/sysinfo.h>
-#include <sys/resource.h>
 #include <signal.h>
 #include "bench.h"
 #include "testing_helpers.h"

tools/testing/selftests/bpf/bpf_rlimit.h

-#include <sys/resource.h>
-#include <stdio.h>
-
-static  __attribute__((constructor)) void bpf_rlimit_ctor(void)
-{
-	struct rlimit rlim_old, rlim_new = {
-		.rlim_cur	= RLIM_INFINITY,
-		.rlim_max	= RLIM_INFINITY,
-	};
-
-	getrlimit(RLIMIT_MEMLOCK, &rlim_old);
-	/* For the sake of running the test cases, we temporarily
-	 * set rlimit to infinity in order for kernel to focus on
-	 * errors from actual test cases and not getting noise
-	 * from hitting memlock limits. The limit is on per-process
-	 * basis and not a global one, hence destructor not really
-	 * needed here.
-	 */
-	if (setrlimit(RLIMIT_MEMLOCK, &rlim_new) < 0) {
-		perror("Unable to lift memlock rlimit");
-		/* Trying out lower limit, but expect potential test
-		 * case failures from this!
-		 */
-		rlim_new.rlim_cur = rlim_old.rlim_cur + (1UL << 20);
-		rlim_new.rlim_max = rlim_old.rlim_max + (1UL << 20);
-		setrlimit(RLIMIT_MEMLOCK, &rlim_new);
-	}
-}

tools/testing/selftests/bpf/flow_dissector_load.c

@@ -11,7 +11,6 @@
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
 
-#include "bpf_rlimit.h"
 #include "flow_dissector_load.h"
 
 const char *cfg_pin_path = "/sys/fs/bpf/flow_dissector";
@@ -25,9 +24,8 @@ static void load_and_attach_program(void)
 	int prog_fd, ret;
 	struct bpf_object *obj;
 
-	ret = libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
-	if (ret)
-		error(1, 0, "failed to enable libbpf strict mode: %d", ret);
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
 
 	ret = bpf_flow_load(&obj, cfg_path_name, cfg_prog_name,
 			    cfg_map_name, NULL, &prog_fd, NULL);

tools/testing/selftests/bpf/get_cgroup_id_user.c

@@ -20,7 +20,6 @@
 
 #include "cgroup_helpers.h"
 #include "testing_helpers.h"
-#include "bpf_rlimit.h"
 
 #define CHECK(condition, tag, format...) ({		\
 	int __ret = !!(condition);			\
@@ -67,6 +66,9 @@ int main(int argc, char **argv)
 	if (CHECK(cgroup_fd < 0, "cgroup_setup_and_join", "err %d errno %d\n", cgroup_fd, errno))
 		return 1;
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
 	if (CHECK(err, "bpf_prog_test_load", "err %d errno %d\n", err, errno))
 		goto cleanup_cgroup_env;

tools/testing/selftests/bpf/prog_tests/btf.c

@@ -8,7 +8,6 @@
 #include <linux/filter.h>
 #include <linux/unistd.h>
 #include <bpf/bpf.h>
-#include <sys/resource.h>
 #include <libelf.h>
 #include <gelf.h>
 #include <string.h>

tools/testing/selftests/bpf/test_cgroup_storage.c

@@ -6,7 +6,6 @@
 #include <stdlib.h>
 #include <sys/sysinfo.h>
 
-#include "bpf_rlimit.h"
 #include "bpf_util.h"
 #include "cgroup_helpers.h"
 #include "testing_helpers.h"
@@ -52,6 +51,9 @@ int main(int argc, char **argv)
 		goto err;
 	}
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	map_fd = bpf_map_create(BPF_MAP_TYPE_CGROUP_STORAGE, NULL, sizeof(key),
 				sizeof(value), 0, NULL);
 	if (map_fd < 0) {

tools/testing/selftests/bpf/test_dev_cgroup.c

@@ -15,7 +15,6 @@
 
 #include "cgroup_helpers.h"
 #include "testing_helpers.h"
-#include "bpf_rlimit.h"
 
 #define DEV_CGROUP_PROG "./dev_cgroup.o"
 
@@ -28,6 +27,9 @@ int main(int argc, char **argv)
 	int prog_fd, cgroup_fd;
 	__u32 prog_cnt;
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	if (bpf_prog_test_load(DEV_CGROUP_PROG, BPF_PROG_TYPE_CGROUP_DEVICE,
 			  &obj, &prog_fd)) {
 		printf("Failed to load DEV_CGROUP program\n");

tools/testing/selftests/bpf/test_lpm_map.c

@@ -26,7 +26,6 @@
 #include <bpf/bpf.h>
 
 #include "bpf_util.h"
-#include "bpf_rlimit.h"
 
 struct tlpm_node {
 	struct tlpm_node *next;
@@ -791,6 +790,9 @@ int main(void)
 	/* we want predictable, pseudo random tests */
 	srand(0xf00ba1);
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	test_lpm_basic();
 	test_lpm_order();
 

tools/testing/selftests/bpf/test_lru_map.c

@@ -18,7 +18,6 @@
 #include <bpf/libbpf.h>
 
 #include "bpf_util.h"
-#include "bpf_rlimit.h"
 #include "../../../include/linux/filter.h"
 
 #define LOCAL_FREE_TARGET	(128)
@@ -878,6 +877,9 @@ int main(int argc, char **argv)
 	assert(nr_cpus != -1);
 	printf("nr_cpus:%d\n\n", nr_cpus);
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	for (f = 0; f < ARRAY_SIZE(map_flags); f++) {
 		unsigned int tgt_free = (map_flags[f] & BPF_F_NO_COMMON_LRU) ?
 			PERCPU_FREE_TARGET : LOCAL_FREE_TARGET;

tools/testing/selftests/bpf/test_skb_cgroup_id_user.c

@@ -15,7 +15,6 @@
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
 
-#include "bpf_rlimit.h"
 #include "cgroup_helpers.h"
 
 #define CGROUP_PATH		"/skb_cgroup_test"
@@ -160,6 +159,9 @@ int main(int argc, char **argv)
 		exit(EXIT_FAILURE);
 	}
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	cgfd = cgroup_setup_and_join(CGROUP_PATH);
 	if (cgfd < 0)
 		goto err;

tools/testing/selftests/bpf/test_sock.c

@@ -14,7 +14,6 @@
 
 #include "cgroup_helpers.h"
 #include <bpf/bpf_endian.h>
-#include "bpf_rlimit.h"
 #include "bpf_util.h"
 
 #define CG_PATH		"/foo"
@@ -541,6 +540,9 @@ int main(int argc, char **argv)
 	if (cgfd < 0)
 		goto err;
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	if (run_tests(cgfd))
 		goto err;
 

tools/testing/selftests/bpf/test_sock_addr.c

@@ -19,7 +19,6 @@
 #include <bpf/libbpf.h>
 
 #include "cgroup_helpers.h"
-#include "bpf_rlimit.h"
 #include "bpf_util.h"
 
 #ifndef ENOTSUPP
@@ -1418,6 +1417,9 @@ int main(int argc, char **argv)
 	if (cgfd < 0)
 		goto err;
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	if (run_tests(cgfd))
 		goto err;
 

tools/testing/selftests/bpf/test_sockmap.c

@@ -18,7 +18,6 @@
 #include <sched.h>
 
 #include <sys/time.h>
-#include <sys/resource.h>
 #include <sys/types.h>
 #include <sys/sendfile.h>
 
@@ -37,7 +36,6 @@
 #include <bpf/libbpf.h>
 
 #include "bpf_util.h"
-#include "bpf_rlimit.h"
 #include "cgroup_helpers.h"
 
 int running;
@@ -2017,6 +2015,9 @@ int main(int argc, char **argv)
 		cg_created = 1;
 	}
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	if (test == SELFTESTS) {
 		err = test_selftest(cg_fd, &options);
 		goto out;

tools/testing/selftests/bpf/test_sysctl.c

@@ -14,7 +14,6 @@
 #include <bpf/libbpf.h>
 
 #include <bpf/bpf_endian.h>
-#include "bpf_rlimit.h"
 #include "bpf_util.h"
 #include "cgroup_helpers.h"
 #include "testing_helpers.h"
@@ -1618,6 +1617,9 @@ int main(int argc, char **argv)
 	if (cgfd < 0)
 		goto err;
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	if (run_tests(cgfd))
 		goto err;
 

tools/testing/selftests/bpf/test_tag.c

@@ -20,7 +20,6 @@
 #include <bpf/bpf.h>
 
 #include "../../../include/linux/filter.h"
-#include "bpf_rlimit.h"
 #include "testing_helpers.h"
 
 static struct bpf_insn prog[BPF_MAXINSNS];
@@ -189,6 +188,9 @@ int main(void)
 	uint32_t tests = 0;
 	int i, fd_map;
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	fd_map = bpf_map_create(BPF_MAP_TYPE_HASH, NULL, sizeof(int),
 				sizeof(int), 1, &opts);
 	assert(fd_map > 0);

tools/testing/selftests/bpf/test_tcp_check_syncookie_user.c

@@ -15,7 +15,6 @@
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
 
-#include "bpf_rlimit.h"
 #include "cgroup_helpers.h"
 
 static int start_server(const struct sockaddr *addr, socklen_t len, bool dual)
@@ -235,6 +234,9 @@ int main(int argc, char **argv)
 		exit(1);
 	}
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	results = get_map_fd_by_prog_id(atoi(argv[1]), &xdp);
 	if (results < 0) {
 		log_err("Can't get map");

tools/testing/selftests/bpf/test_tcpnotify_user.c

@@ -19,7 +19,6 @@
 #include <linux/perf_event.h>
 #include <linux/err.h>
 
-#include "bpf_rlimit.h"
 #include "bpf_util.h"
 #include "cgroup_helpers.h"
 

tools/testing/selftests/bpf/test_verifier_log.c

@@ -11,8 +11,6 @@
 
 #include <bpf/bpf.h>
 
-#include "bpf_rlimit.h"
-
 #define LOG_SIZE (1 << 20)
 
 #define err(str...)	printf("ERROR: " str)
@@ -141,6 +139,9 @@ int main(int argc, char **argv)
 
 	memset(log, 1, LOG_SIZE);
 
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+
 	/* Test incorrect attr */
 	printf("Test log_level 0...\n");
 	test_log_bad(log, LOG_SIZE, 0);

tools/testing/selftests/bpf/xdp_redirect_multi.c

@@ -10,7 +10,6 @@
 #include <net/if.h>
 #include <unistd.h>
 #include <libgen.h>
-#include <sys/resource.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/socket.h>

tools/testing/selftests/bpf/xdping.c

@@ -12,7 +12,6 @@
 #include <string.h>
 #include <unistd.h>
 #include <libgen.h>
-#include <sys/resource.h>
 #include <net/if.h>
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -89,7 +88,6 @@ int main(int argc, char **argv)
 {
 	__u32 mode_flags = XDP_FLAGS_DRV_MODE | XDP_FLAGS_SKB_MODE;
 	struct addrinfo *a, hints = { .ai_family = AF_INET };
-	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 	__u16 count = XDPING_DEFAULT_COUNT;
 	struct pinginfo pinginfo = { 0 };
 	const char *optstr = "c:I:NsS";
@@ -167,10 +165,8 @@ int main(int argc, char **argv)
 		freeaddrinfo(a);
 	}
 
-	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
-		perror("setrlimit(RLIMIT_MEMLOCK)");
-		return 1;
-	}
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
 
 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
 

tools/testing/selftests/bpf/xdpxceiver.c

@@ -90,7 +90,6 @@
 #include <string.h>
 #include <stddef.h>
 #include <sys/mman.h>
-#include <sys/resource.h>
 #include <sys/types.h>
 #include <sys/queue.h>
 #include <time.h>
@@ -1448,14 +1447,13 @@ static void ifobject_delete(struct ifobject *ifobj)
 
 int main(int argc, char **argv)
 {
-	struct rlimit _rlim = { RLIM_INFINITY, RLIM_INFINITY };
 	struct pkt_stream *pkt_stream_default;
 	struct ifobject *ifobj_tx, *ifobj_rx;
 	struct test_spec test;
 	u32 i, j;
 
-	if (setrlimit(RLIMIT_MEMLOCK, &_rlim))
-		exit_with_error(errno);
+	/* Use libbpf 1.0 API mode */
+	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
 
 	ifobj_tx = ifobject_create();
 	if (!ifobj_tx)