mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00
selftests/bpf: Add bpf_snprintf_btf helper tests
Tests verifying snprintf()ing of various data structures, flags combinations using a tp_btf program. Tests are skipped if __builtin_btf_type_id is not available to retrieve BTF type ids. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/1601292670-1616-5-git-send-email-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire
Alexei Starovoitov
parent
c4d0bfb450
commit
076a95f5af
60
tools/testing/selftests/bpf/prog_tests/snprintf_btf.c
Normal file
60
tools/testing/selftests/bpf/prog_tests/snprintf_btf.c
Normal file
@ -0,0 +1,60 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
#include <test_progs.h>
|
||||
#include <linux/btf.h>
|
||||
#include "netif_receive_skb.skel.h"
|
||||
|
||||
/* Demonstrate that bpf_snprintf_btf succeeds and that various data types
|
||||
* are formatted correctly.
|
||||
*/
|
||||
void test_snprintf_btf(void)
|
||||
{
|
||||
struct netif_receive_skb *skel;
|
||||
struct netif_receive_skb__bss *bss;
|
||||
int err, duration = 0;
|
||||
|
||||
skel = netif_receive_skb__open();
|
||||
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
|
||||
return;
|
||||
|
||||
err = netif_receive_skb__load(skel);
|
||||
if (CHECK(err, "skel_load", "failed to load skeleton: %d\n", err))
|
||||
goto cleanup;
|
||||
|
||||
bss = skel->bss;
|
||||
|
||||
err = netif_receive_skb__attach(skel);
|
||||
if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
|
||||
goto cleanup;
|
||||
|
||||
/* generate receive event */
|
||||
system("ping -c 1 127.0.0.1 > /dev/null");
|
||||
|
||||
if (bss->skip) {
|
||||
printf("%s:SKIP:no __builtin_btf_type_id\n", __func__);
|
||||
test__skip();
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
/*
|
||||
* Make sure netif_receive_skb program was triggered
|
||||
* and it set expected return values from bpf_trace_printk()s
|
||||
* and all tests ran.
|
||||
*/
|
||||
if (CHECK(bss->ret <= 0,
|
||||
"bpf_snprintf_btf: got return value",
|
||||
"ret <= 0 %ld test %d\n", bss->ret, bss->ran_subtests))
|
||||
goto cleanup;
|
||||
|
||||
if (CHECK(bss->ran_subtests == 0, "check if subtests ran",
|
||||
"no subtests ran, did BPF program run?"))
|
||||
goto cleanup;
|
||||
|
||||
if (CHECK(bss->num_subtests != bss->ran_subtests,
|
||||
"check all subtests ran",
|
||||
"only ran %d of %d tests\n", bss->num_subtests,
|
||||
bss->ran_subtests))
|
||||
goto cleanup;
|
||||
|
||||
cleanup:
|
||||
netif_receive_skb__destroy(skel);
|
||||
}
|
||||
249
tools/testing/selftests/bpf/progs/netif_receive_skb.c
Normal file
249
tools/testing/selftests/bpf/progs/netif_receive_skb.c
Normal file
@ -0,0 +1,249 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
/* Copyright (c) 2020, Oracle and/or its affiliates. */
|
||||
|
||||
#include "vmlinux.h"
|
||||
#include <bpf/bpf_helpers.h>
|
||||
#include <bpf/bpf_tracing.h>
|
||||
#include <bpf/bpf_core_read.h>
|
||||
|
||||
#include <errno.h>
|
||||
|
||||
long ret = 0;
|
||||
int num_subtests = 0;
|
||||
int ran_subtests = 0;
|
||||
bool skip = false;
|
||||
|
||||
#define STRSIZE 2048
|
||||
#define EXPECTED_STRSIZE 256
|
||||
|
||||
#ifndef ARRAY_SIZE
|
||||
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
||||
#endif
|
||||
|
||||
struct {
|
||||
__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
|
||||
__uint(max_entries, 1);
|
||||
__type(key, __u32);
|
||||
__type(value, char[STRSIZE]);
|
||||
} strdata SEC(".maps");
|
||||
|
||||
static int __strncmp(const void *m1, const void *m2, size_t len)
|
||||
{
|
||||
const unsigned char *s1 = m1;
|
||||
const unsigned char *s2 = m2;
|
||||
int i, delta = 0;
|
||||
|
||||
for (i = 0; i < len; i++) {
|
||||
delta = s1[i] - s2[i];
|
||||
if (delta || s1[i] == 0 || s2[i] == 0)
|
||||
break;
|
||||
}
|
||||
return delta;
|
||||
}
|
||||
|
||||
#if __has_builtin(__builtin_btf_type_id)
|
||||
#define TEST_BTF(_str, _type, _flags, _expected, ...) \
|
||||
do { \
|
||||
static const char _expectedval[EXPECTED_STRSIZE] = \
|
||||
_expected; \
|
||||
static const char _ptrtype[64] = #_type; \
|
||||
__u64 _hflags = _flags | BTF_F_COMPACT; \
|
||||
static _type _ptrdata = __VA_ARGS__; \
|
||||
static struct btf_ptr _ptr = { }; \
|
||||
int _cmp; \
|
||||
\
|
||||
++num_subtests; \
|
||||
if (ret < 0) \
|
||||
break; \
|
||||
++ran_subtests; \
|
||||
_ptr.ptr = &_ptrdata; \
|
||||
_ptr.type_id = bpf_core_type_id_kernel(_type); \
|
||||
if (_ptr.type_id <= 0) { \
|
||||
ret = -EINVAL; \
|
||||
break; \
|
||||
} \
|
||||
ret = bpf_snprintf_btf(_str, STRSIZE, \
|
||||
&_ptr, sizeof(_ptr), _hflags); \
|
||||
if (ret) \
|
||||
break; \
|
||||
_cmp = __strncmp(_str, _expectedval, EXPECTED_STRSIZE); \
|
||||
if (_cmp != 0) { \
|
||||
bpf_printk("(%d) got %s", _cmp, _str); \
|
||||
bpf_printk("(%d) expected %s", _cmp, \
|
||||
_expectedval); \
|
||||
ret = -EBADMSG; \
|
||||
break; \
|
||||
} \
|
||||
} while (0)
|
||||
#endif
|
||||
|
||||
/* Use where expected data string matches its stringified declaration */
|
||||
#define TEST_BTF_C(_str, _type, _flags, ...) \
|
||||
TEST_BTF(_str, _type, _flags, "(" #_type ")" #__VA_ARGS__, \
|
||||
__VA_ARGS__)
|
||||
|
||||
/* TRACE_EVENT(netif_receive_skb,
|
||||
* TP_PROTO(struct sk_buff *skb),
|
||||
*/
|
||||
SEC("tp_btf/netif_receive_skb")
|
||||
int BPF_PROG(trace_netif_receive_skb, struct sk_buff *skb)
|
||||
{
|
||||
static __u64 flags[] = { 0, BTF_F_COMPACT, BTF_F_ZERO, BTF_F_PTR_RAW,
|
||||
BTF_F_NONAME, BTF_F_COMPACT | BTF_F_ZERO |
|
||||
BTF_F_PTR_RAW | BTF_F_NONAME };
|
||||
static struct btf_ptr p = { };
|
||||
__u32 key = 0;
|
||||
int i, __ret;
|
||||
char *str;
|
||||
|
||||
#if __has_builtin(__builtin_btf_type_id)
|
||||
str = bpf_map_lookup_elem(&strdata, &key);
|
||||
if (!str)
|
||||
return 0;
|
||||
|
||||
/* Ensure we can write skb string representation */
|
||||
p.type_id = bpf_core_type_id_kernel(struct sk_buff);
|
||||
p.ptr = skb;
|
||||
for (i = 0; i < ARRAY_SIZE(flags); i++) {
|
||||
++num_subtests;
|
||||
ret = bpf_snprintf_btf(str, STRSIZE, &p, sizeof(p), 0);
|
||||
if (ret < 0)
|
||||
bpf_printk("returned %d when writing skb", ret);
|
||||
++ran_subtests;
|
||||
}
|
||||
|
||||
/* Check invalid ptr value */
|
||||
p.ptr = 0;
|
||||
__ret = bpf_snprintf_btf(str, STRSIZE, &p, sizeof(p), 0);
|
||||
if (__ret >= 0) {
|
||||
bpf_printk("printing NULL should generate error, got (%d)",
|
||||
__ret);
|
||||
ret = -ERANGE;
|
||||
}
|
||||
|
||||
/* Verify type display for various types. */
|
||||
|
||||
/* simple int */
|
||||
TEST_BTF_C(str, int, 0, 1234);
|
||||
TEST_BTF(str, int, BTF_F_NONAME, "1234", 1234);
|
||||
/* zero value should be printed at toplevel */
|
||||
TEST_BTF(str, int, 0, "(int)0", 0);
|
||||
TEST_BTF(str, int, BTF_F_NONAME, "0", 0);
|
||||
TEST_BTF(str, int, BTF_F_ZERO, "(int)0", 0);
|
||||
TEST_BTF(str, int, BTF_F_NONAME | BTF_F_ZERO, "0", 0);
|
||||
TEST_BTF_C(str, int, 0, -4567);
|
||||
TEST_BTF(str, int, BTF_F_NONAME, "-4567", -4567);
|
||||
|
||||
/* simple char */
|
||||
TEST_BTF_C(str, char, 0, 100);
|
||||
TEST_BTF(str, char, BTF_F_NONAME, "100", 100);
|
||||
/* zero value should be printed at toplevel */
|
||||
TEST_BTF(str, char, 0, "(char)0", 0);
|
||||
TEST_BTF(str, char, BTF_F_NONAME, "0", 0);
|
||||
TEST_BTF(str, char, BTF_F_ZERO, "(char)0", 0);
|
||||
TEST_BTF(str, char, BTF_F_NONAME | BTF_F_ZERO, "0", 0);
|
||||
|
||||
/* simple typedef */
|
||||
TEST_BTF_C(str, uint64_t, 0, 100);
|
||||
TEST_BTF(str, u64, BTF_F_NONAME, "1", 1);
|
||||
/* zero value should be printed at toplevel */
|
||||
TEST_BTF(str, u64, 0, "(u64)0", 0);
|
||||
TEST_BTF(str, u64, BTF_F_NONAME, "0", 0);
|
||||
TEST_BTF(str, u64, BTF_F_ZERO, "(u64)0", 0);
|
||||
TEST_BTF(str, u64, BTF_F_NONAME|BTF_F_ZERO, "0", 0);
|
||||
|
||||
/* typedef struct */
|
||||
TEST_BTF_C(str, atomic_t, 0, {.counter = (int)1,});
|
||||
TEST_BTF(str, atomic_t, BTF_F_NONAME, "{1,}", {.counter = 1,});
|
||||
/* typedef with 0 value should be printed at toplevel */
|
||||
TEST_BTF(str, atomic_t, 0, "(atomic_t){}", {.counter = 0,});
|
||||
TEST_BTF(str, atomic_t, BTF_F_NONAME, "{}", {.counter = 0,});
|
||||
TEST_BTF(str, atomic_t, BTF_F_ZERO, "(atomic_t){.counter = (int)0,}",
|
||||
{.counter = 0,});
|
||||
TEST_BTF(str, atomic_t, BTF_F_NONAME|BTF_F_ZERO,
|
||||
"{0,}", {.counter = 0,});
|
||||
|
||||
/* enum where enum value does (and does not) exist */
|
||||
TEST_BTF_C(str, enum bpf_cmd, 0, BPF_MAP_CREATE);
|
||||
TEST_BTF(str, enum bpf_cmd, 0, "(enum bpf_cmd)BPF_MAP_CREATE", 0);
|
||||
TEST_BTF(str, enum bpf_cmd, BTF_F_NONAME, "BPF_MAP_CREATE",
|
||||
BPF_MAP_CREATE);
|
||||
TEST_BTF(str, enum bpf_cmd, BTF_F_NONAME|BTF_F_ZERO,
|
||||
"BPF_MAP_CREATE", 0);
|
||||
|
||||
TEST_BTF(str, enum bpf_cmd, BTF_F_ZERO, "(enum bpf_cmd)BPF_MAP_CREATE",
|
||||
BPF_MAP_CREATE);
|
||||
TEST_BTF(str, enum bpf_cmd, BTF_F_NONAME|BTF_F_ZERO,
|
||||
"BPF_MAP_CREATE", BPF_MAP_CREATE);
|
||||
TEST_BTF_C(str, enum bpf_cmd, 0, 2000);
|
||||
TEST_BTF(str, enum bpf_cmd, BTF_F_NONAME, "2000", 2000);
|
||||
|
||||
/* simple struct */
|
||||
TEST_BTF_C(str, struct btf_enum, 0,
|
||||
{.name_off = (__u32)3,.val = (__s32)-1,});
|
||||
TEST_BTF(str, struct btf_enum, BTF_F_NONAME, "{3,-1,}",
|
||||
{ .name_off = 3, .val = -1,});
|
||||
TEST_BTF(str, struct btf_enum, BTF_F_NONAME, "{-1,}",
|
||||
{ .name_off = 0, .val = -1,});
|
||||
TEST_BTF(str, struct btf_enum, BTF_F_NONAME|BTF_F_ZERO, "{0,-1,}",
|
||||
{ .name_off = 0, .val = -1,});
|
||||
/* empty struct should be printed */
|
||||
TEST_BTF(str, struct btf_enum, 0, "(struct btf_enum){}",
|
||||
{ .name_off = 0, .val = 0,});
|
||||
TEST_BTF(str, struct btf_enum, BTF_F_NONAME, "{}",
|
||||
{ .name_off = 0, .val = 0,});
|
||||
TEST_BTF(str, struct btf_enum, BTF_F_ZERO,
|
||||
"(struct btf_enum){.name_off = (__u32)0,.val = (__s32)0,}",
|
||||
{ .name_off = 0, .val = 0,});
|
||||
|
||||
/* struct with pointers */
|
||||
TEST_BTF(str, struct list_head, BTF_F_PTR_RAW,
|
||||
"(struct list_head){.next = (struct list_head *)0x0000000000000001,}",
|
||||
{ .next = (struct list_head *)1 });
|
||||
/* NULL pointer should not be displayed */
|
||||
TEST_BTF(str, struct list_head, BTF_F_PTR_RAW,
|
||||
"(struct list_head){}",
|
||||
{ .next = (struct list_head *)0 });
|
||||
|
||||
/* struct with char array */
|
||||
TEST_BTF(str, struct bpf_prog_info, 0,
|
||||
"(struct bpf_prog_info){.name = (char[])['f','o','o',],}",
|
||||
{ .name = "foo",});
|
||||
TEST_BTF(str, struct bpf_prog_info, BTF_F_NONAME,
|
||||
"{['f','o','o',],}",
|
||||
{.name = "foo",});
|
||||
/* leading null char means do not display string */
|
||||
TEST_BTF(str, struct bpf_prog_info, 0,
|
||||
"(struct bpf_prog_info){}",
|
||||
{.name = {'\0', 'f', 'o', 'o'}});
|
||||
/* handle non-printable characters */
|
||||
TEST_BTF(str, struct bpf_prog_info, 0,
|
||||
"(struct bpf_prog_info){.name = (char[])[1,2,3,],}",
|
||||
{ .name = {1, 2, 3, 0}});
|
||||
|
||||
/* struct with non-char array */
|
||||
TEST_BTF(str, struct __sk_buff, 0,
|
||||
"(struct __sk_buff){.cb = (__u32[])[1,2,3,4,5,],}",
|
||||
{ .cb = {1, 2, 3, 4, 5,},});
|
||||
TEST_BTF(str, struct __sk_buff, BTF_F_NONAME,
|
||||
"{[1,2,3,4,5,],}",
|
||||
{ .cb = { 1, 2, 3, 4, 5},});
|
||||
/* For non-char, arrays, show non-zero values only */
|
||||
TEST_BTF(str, struct __sk_buff, 0,
|
||||
"(struct __sk_buff){.cb = (__u32[])[1,],}",
|
||||
{ .cb = { 0, 0, 1, 0, 0},});
|
||||
|
||||
/* struct with bitfields */
|
||||
TEST_BTF_C(str, struct bpf_insn, 0,
|
||||
{.code = (__u8)1,.dst_reg = (__u8)0x2,.src_reg = (__u8)0x3,.off = (__s16)4,.imm = (__s32)5,});
|
||||
TEST_BTF(str, struct bpf_insn, BTF_F_NONAME, "{1,0x2,0x3,4,5,}",
|
||||
{.code = 1, .dst_reg = 0x2, .src_reg = 0x3, .off = 4,
|
||||
.imm = 5,});
|
||||
#else
|
||||
skip = true;
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
Loading…
Reference in New Issue
Block a user