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libbpf: Put Kconfig externs into .kconfig section

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Move Kconfig-provided externs into custom .kconfig section. Add __kconfig into
bpf_helpers.h for user convenience. Update selftests accordingly.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191219002837.3074619-2-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2019-12-18 16:28:34 -08:00
committed by Alexei Starovoitov
parent d69587062c
commit 81bfdd087b
6 changed files with 60 additions and 48 deletions
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16
tools/testing/selftests/bpf/prog_tests/skeleton.c
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@@ -15,20 +15,18 @@ void test_skeleton(void)
int duration = 0, err;
struct test_skeleton* skel;
struct test_skeleton__bss *bss;
struct test_skeleton__externs *exts;
struct test_skeleton__kconfig *kcfg;
skel = test_skeleton__open();
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
return;
printf("EXTERNS BEFORE: %p\n", skel->externs);
if (CHECK(skel->externs, "skel_externs", "externs are mmaped()!\n"))
if (CHECK(skel->kconfig, "skel_kconfig", "kconfig is mmaped()!\n"))
goto cleanup;
err = test_skeleton__load(skel);
if (CHECK(err, "skel_load", "failed to load skeleton: %d\n", err))
goto cleanup;
printf("EXTERNS AFTER: %p\n", skel->externs);
bss = skel->bss;
bss->in1 = 1;
@@ -37,7 +35,7 @@ void test_skeleton(void)
bss->in4 = 4;
bss->in5.a = 5;
bss->in5.b = 6;
exts = skel->externs;
kcfg = skel->kconfig;
err = test_skeleton__attach(skel);
if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
@@ -55,10 +53,10 @@ void test_skeleton(void)
CHECK(bss->handler_out5.b != 6, "res6", "got %lld != exp %d\n",
bss->handler_out5.b, 6);
CHECK(bss->bpf_syscall != exts->CONFIG_BPF_SYSCALL, "ext1",
"got %d != exp %d\n", bss->bpf_syscall, exts->CONFIG_BPF_SYSCALL);
CHECK(bss->kern_ver != exts->LINUX_KERNEL_VERSION, "ext2",
"got %d != exp %d\n", bss->kern_ver, exts->LINUX_KERNEL_VERSION);
CHECK(bss->bpf_syscall != kcfg->CONFIG_BPF_SYSCALL, "ext1",
"got %d != exp %d\n", bss->bpf_syscall, kcfg->CONFIG_BPF_SYSCALL);
CHECK(bss->kern_ver != kcfg->LINUX_KERNEL_VERSION, "ext2",
"got %d != exp %d\n", bss->kern_ver, kcfg->LINUX_KERNEL_VERSION);
cleanup:
test_skeleton__destroy(skel);

20
tools/testing/selftests/bpf/progs/test_core_extern.c
View File

@@ -10,16 +10,16 @@
/* non-existing BPF helper, to test dead code elimination */
static int (*bpf_missing_helper)(const void *arg1, int arg2) = (void *) 999;
extern int LINUX_KERNEL_VERSION;
extern bool CONFIG_BPF_SYSCALL; /* strong */
extern enum libbpf_tristate CONFIG_TRISTATE __weak;
extern bool CONFIG_BOOL __weak;
extern char CONFIG_CHAR __weak;
extern uint16_t CONFIG_USHORT __weak;
extern int CONFIG_INT __weak;
extern uint64_t CONFIG_ULONG __weak;
extern const char CONFIG_STR[8] __weak;
extern uint64_t CONFIG_MISSING __weak;
extern int LINUX_KERNEL_VERSION __kconfig;
extern bool CONFIG_BPF_SYSCALL __kconfig; /* strong */
extern enum libbpf_tristate CONFIG_TRISTATE __kconfig __weak;
extern bool CONFIG_BOOL __kconfig __weak;
extern char CONFIG_CHAR __kconfig __weak;
extern uint16_t CONFIG_USHORT __kconfig __weak;
extern int CONFIG_INT __kconfig __weak;
extern uint64_t CONFIG_ULONG __kconfig __weak;
extern const char CONFIG_STR[8] __kconfig __weak;
extern uint64_t CONFIG_MISSING __kconfig __weak;
uint64_t kern_ver = -1;
uint64_t bpf_syscall = -1;

4
tools/testing/selftests/bpf/progs/test_skeleton.c
View File

@@ -21,8 +21,8 @@ char out3 = 0;
long long out4 = 0;
int out1 = 0;
extern bool CONFIG_BPF_SYSCALL;
extern int LINUX_KERNEL_VERSION;
extern bool CONFIG_BPF_SYSCALL __kconfig;
extern int LINUX_KERNEL_VERSION __kconfig;
bool bpf_syscall = 0;
int kern_ver = 0;