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bpftool: Use libbpf 1.0 API mode instead of RLIMIT_MEMLOCK

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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.

libbpf_set_strict_mode always return 0, so we don't need to check whether
the return value is 0 or not.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220409125958.92629-4-laoar.shao@gmail.com
This commit is contained in:
Yafang Shao 2022-04-09 12:59:57 +00:00 committed by Andrii Nakryiko
parent b858ba8c52
commit a777e18f1b
8 changed files with 3 additions and 23 deletions
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8
tools/bpf/bpftool/common.c
View file

@ -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)
{

2
tools/bpf/bpftool/feature.c
View file

@ -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) {

6
tools/bpf/bpftool/main.c
View file

@ -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;

2
tools/bpf/bpftool/main.h
View file

@ -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 {

2
tools/bpf/bpftool/map.c
View file

@ -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));

1
tools/bpf/bpftool/pids.c
View file

@ -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) {

3
tools/bpf/bpftool/prog.c
View file

@ -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");

2
tools/bpf/bpftool/struct_ops.c
View file

@ -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;