[PATCH v5 bpf-next 3/3] selftests/bpf: add dump type data tests to btf dump tests
From: Alan Maguire
Date: Sat Jun 19 2021 - 04:57:06 EST
Test various type data dumping operations by comparing expected
format with the dumped string; an snprintf-style printf function
is used to record the string dumped. Also verify overflow handling
where the data passed does not cover the full size of a type,
such as would occur if a tracer has a portion of the 8k
"struct task_struct".
Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
---
tools/testing/selftests/bpf/prog_tests/btf_dump.c | 644 ++++++++++++++++++++++
1 file changed, 644 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/btf_dump.c b/tools/testing/selftests/bpf/prog_tests/btf_dump.c
index 1b90e68..c894201 100644
--- a/tools/testing/selftests/bpf/prog_tests/btf_dump.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf_dump.c
@@ -232,7 +232,621 @@ void test_btf_dump_incremental(void)
btf__free(btf);
}
+#define STRSIZE 4096
+
+static void btf_dump_snprintf(void *ctx, const char *fmt, va_list args)
+{
+ char *s = ctx, new[STRSIZE];
+
+ vsnprintf(new, STRSIZE, fmt, args);
+ strncat(s, new, STRSIZE);
+}
+
+/* skip "enum "/"struct " prefixes */
+#define SKIP_PREFIX(_typestr, _prefix) \
+ do { \
+ if (strncmp(_typestr, _prefix, strlen(_prefix)) == 0) \
+ _typestr += strlen(_prefix) + 1; \
+ } while (0)
+
+static int btf_dump_data(struct btf *btf, struct btf_dump *d,
+ char *name, __u64 flags, void *ptr,
+ size_t ptr_sz, char *str, const char *expected_val)
+{
+ DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
+ size_t type_sz;
+ __s32 type_id;
+ int ret = 0;
+
+ if (flags & BTF_F_COMPACT)
+ opts.compact = true;
+ if (flags & BTF_F_NONAME)
+ opts.skip_names = true;
+ if (flags & BTF_F_ZERO)
+ opts.emit_zeroes = true;
+ SKIP_PREFIX(name, "enum");
+ SKIP_PREFIX(name, "struct");
+ SKIP_PREFIX(name, "union");
+ type_id = btf__find_by_name(btf, name);
+ if (!ASSERT_GE(type_id, 0, "find type id"))
+ return -ENOENT;
+ type_sz = btf__resolve_size(btf, type_id);
+ str[0] = '\0';
+ ret = btf_dump__dump_type_data(d, type_id, ptr, ptr_sz, &opts);
+ if (type_sz <= ptr_sz) {
+ if (!ASSERT_EQ(ret, type_sz, "failed/unexpected type_sz"))
+ return -EINVAL;
+ } else {
+ if (!ASSERT_EQ(ret, -E2BIG, "failed to return -E2BIG"))
+ return -EINVAL;
+ }
+ if (!ASSERT_STREQ(str, expected_val, "ensure expected/actual match"))
+ return -EFAULT;
+ return 0;
+}
+
+#define TEST_BTF_DUMP_DATA(_b, _d, _str, _type, _flags, _expected, ...) \
+ do { \
+ char __ptrtype[64] = #_type; \
+ char *_ptrtype = (char *)__ptrtype; \
+ _type _ptrdata = __VA_ARGS__; \
+ void *_ptr = &_ptrdata; \
+ int _err; \
+ \
+ _err = btf_dump_data(_b, _d, _ptrtype, _flags, _ptr, \
+ sizeof(_type), _str, _expected); \
+ if (_err < 0) \
+ return; \
+ } while (0)
+
+/* Use where expected data string matches its stringified declaration */
+#define TEST_BTF_DUMP_DATA_C(_b, _d, _str, _type, _flags, ...) \
+ TEST_BTF_DUMP_DATA(_b, _d, _str, _type, _flags, \
+ "(" #_type ")" #__VA_ARGS__, __VA_ARGS__)
+
+/* overflow test; pass typesize < expected type size, ensure E2BIG returned */
+#define TEST_BTF_DUMP_DATA_OVER(_b, _d, _str, _type, _type_sz, _expected, ...)\
+ do { \
+ char __ptrtype[64] = #_type; \
+ char *_ptrtype = (char *)__ptrtype; \
+ _type _ptrdata = __VA_ARGS__; \
+ void *_ptr = &_ptrdata; \
+ int _err; \
+ \
+ _err = btf_dump_data(_b, _d, _ptrtype, 0, _ptr, \
+ _type_sz, _str, _expected); \
+ if (_err < 0) \
+ return; \
+ } while (0)
+
+#define TEST_BTF_DUMP_VAR(_b, _d, _str, _var, _type, _flags, _expected, ...) \
+ do { \
+ _type _ptrdata = __VA_ARGS__; \
+ void *_ptr = &_ptrdata; \
+ int _err; \
+ \
+ _err = btf_dump_data(_b, _d, _var, _flags, _ptr, \
+ sizeof(_type), _str, _expected); \
+ if (_err < 0) \
+ return; \
+ } while (0)
+
+static void test_btf_dump_int_data(struct btf *btf, struct btf_dump *d,
+ char *str)
+{
+ /* simple int */
+ TEST_BTF_DUMP_DATA_C(btf, d, str, int, BTF_F_COMPACT, 1234);
+ TEST_BTF_DUMP_DATA(btf, d, str, int, BTF_F_COMPACT | BTF_F_NONAME,
+ "1234", 1234);
+ TEST_BTF_DUMP_DATA(btf, d, str, int, 0, "(int)1234", 1234);
+
+ /* zero value should be printed at toplevel */
+ TEST_BTF_DUMP_DATA(btf, d, str, int, BTF_F_COMPACT, "(int)0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, int, BTF_F_COMPACT | BTF_F_NONAME,
+ "0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, int, BTF_F_COMPACT | BTF_F_ZERO,
+ "(int)0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, int,
+ BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
+ "0", 0);
+ TEST_BTF_DUMP_DATA_C(btf, d, str, int, BTF_F_COMPACT, -4567);
+ TEST_BTF_DUMP_DATA(btf, d, str, int, BTF_F_COMPACT | BTF_F_NONAME,
+ "-4567", -4567);
+ TEST_BTF_DUMP_DATA(btf, d, str, int, 0, "(int)-4567", -4567);
+
+ TEST_BTF_DUMP_DATA_OVER(btf, d, str, int, sizeof(int)-1, "", 1);
+}
+
+static void test_btf_dump_float_data(struct btf *btf, struct btf_dump *d,
+ char *str)
+{
+ float t1 = 1.234567;
+ float t2 = -1.234567;
+ float t3 = 0.0;
+ double t4 = 5.678912;
+ double t5 = -5.678912;
+ double t6 = 0.0;
+ long double t7 = 9.876543;
+ long double t8 = -9.876543;
+ long double t9 = 0.0;
+
+ /* since the kernel does not likely have any float types in its BTF, we
+ * will need to add some of various sizes.
+ */
+
+ if (!ASSERT_GT(btf__add_float(btf, "test_float", 4), 0, "add float"))
+ return;
+ if (!ASSERT_OK(btf_dump_data(btf, d, "test_float", 0, &t1, 4, str,
+ "(test_float)1.234567"), "dump float"))
+ return;
+
+ if (!ASSERT_OK(btf_dump_data(btf, d, "test_float", 0, &t2, 4, str,
+ "(test_float)-1.234567"), "dump float"))
+ return;
+ if (!ASSERT_OK(btf_dump_data(btf, d, "test_float", 0, &t3, 4, str,
+ "(test_float)0.000000"), "dump float"))
+ return;
+
+ if (!ASSERT_GT(btf__add_float(btf, "test_double", 8), 0, "add_double"))
+ return;
+ if (!ASSERT_OK(btf_dump_data(btf, d, "test_double", 0, &t4, 8, str,
+ "(test_double)5.678912"), "dump double"))
+ return;
+ if (!ASSERT_OK(btf_dump_data(btf, d, "test_double", 0, &t5, 8, str,
+ "(test_double)-5.678912"), "dump double"))
+ return;
+ if (!ASSERT_OK(btf_dump_data(btf, d, "test_double", 0, &t6, 8, str,
+ "(test_double)0.000000"), "dump double"))
+ return;
+
+ if (!ASSERT_GT(btf__add_float(btf, "test_long_double", 16), 0,
+ "add_long_double"))
+ return;
+ if (!ASSERT_OK(btf_dump_data(btf, d, "test_long_double", 0, &t7, 16,
+ str, "(test_long_double)9.876543"),
+ "dump long_double"))
+ return;
+ if (!ASSERT_OK(btf_dump_data(btf, d, "test_long_double", 0, &t8, 16,
+ str, "(test_long_double)-9.876543"),
+ "dump long_double"))
+ return;
+ ASSERT_OK(btf_dump_data(btf, d, "test_long_double", 0, &t9, 16,
+ str, "(test_long_double)0.000000"),
+ "dump long_double");
+}
+
+static void test_btf_dump_char_data(struct btf *btf, struct btf_dump *d,
+ char *str)
+{
+ /* simple char */
+ TEST_BTF_DUMP_DATA_C(btf, d, str, char, BTF_F_COMPACT, 100);
+ TEST_BTF_DUMP_DATA(btf, d, str, char, BTF_F_COMPACT | BTF_F_NONAME,
+ "100", 100);
+ TEST_BTF_DUMP_DATA(btf, d, str, char, 0, "(char)100", 100);
+ /* zero value should be printed at toplevel */
+ TEST_BTF_DUMP_DATA(btf, d, str, char, BTF_F_COMPACT, "(char)0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, char, BTF_F_COMPACT | BTF_F_NONAME,
+ "0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, char, BTF_F_COMPACT | BTF_F_ZERO,
+ "(char)0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, char,
+ BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
+ "0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, char, 0, "(char)0", 0);
+
+ TEST_BTF_DUMP_DATA_OVER(btf, d, str, char, sizeof(char)-1, "", 100);
+}
+
+static void test_btf_dump_typedef_data(struct btf *btf, struct btf_dump *d,
+ char *str)
+{
+ /* simple typedef */
+ TEST_BTF_DUMP_DATA_C(btf, d, str, uint64_t, BTF_F_COMPACT, 100);
+ TEST_BTF_DUMP_DATA(btf, d, str, u64, BTF_F_COMPACT | BTF_F_NONAME,
+ "1", 1);
+ TEST_BTF_DUMP_DATA(btf, d, str, u64, 0, "(u64)1", 1);
+ /* zero value should be printed at toplevel */
+ TEST_BTF_DUMP_DATA(btf, d, str, u64, BTF_F_COMPACT, "(u64)0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, u64, BTF_F_COMPACT | BTF_F_NONAME,
+ "0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, u64, BTF_F_COMPACT | BTF_F_ZERO,
+ "(u64)0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, u64,
+ BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
+ "0", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, u64, 0, "(u64)0", 0);
+
+ /* typedef struct */
+ TEST_BTF_DUMP_DATA_C(btf, d, str, atomic_t, BTF_F_COMPACT,
+ {.counter = (int)1,});
+ TEST_BTF_DUMP_DATA(btf, d, str, atomic_t, BTF_F_COMPACT | BTF_F_NONAME,
+ "{1,}", { .counter = 1 });
+ TEST_BTF_DUMP_DATA(btf, d, str, atomic_t, 0,
+"(atomic_t){\n"
+" .counter = (int)1,\n"
+"}",
+ {.counter = 1,});
+ /* typedef with 0 value should be printed at toplevel */
+ TEST_BTF_DUMP_DATA(btf, d, str, atomic_t, BTF_F_COMPACT, "(atomic_t){}",
+ {.counter = 0,});
+ TEST_BTF_DUMP_DATA(btf, d, str, atomic_t, BTF_F_COMPACT | BTF_F_NONAME,
+ "{}", {.counter = 0,});
+ TEST_BTF_DUMP_DATA(btf, d, str, atomic_t, 0,
+"(atomic_t){\n"
+"}",
+ {.counter = 0,});
+ TEST_BTF_DUMP_DATA(btf, d, str, atomic_t, BTF_F_COMPACT | BTF_F_ZERO,
+ "(atomic_t){.counter = (int)0,}",
+ {.counter = 0,});
+ TEST_BTF_DUMP_DATA(btf, d, str, atomic_t,
+ BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
+ "{0,}", {.counter = 0,});
+ TEST_BTF_DUMP_DATA(btf, d, str, atomic_t, BTF_F_ZERO,
+"(atomic_t){\n"
+" .counter = (int)0,\n"
+"}",
+ { .counter = 0,});
+
+ /* overflow should show type but not value since it overflows */
+ TEST_BTF_DUMP_DATA_OVER(btf, d, str, atomic_t, sizeof(atomic_t)-1,
+ "(atomic_t){\n", { .counter = 1});
+}
+
+static void test_btf_dump_enum_data(struct btf *btf, struct btf_dump *d,
+ char *str)
+{
+ /* enum where enum value does (and does not) exist */
+ TEST_BTF_DUMP_DATA_C(btf, d, str, enum bpf_cmd, BTF_F_COMPACT,
+ BPF_MAP_CREATE);
+ TEST_BTF_DUMP_DATA(btf, d, str, enum bpf_cmd, BTF_F_COMPACT,
+ "(enum bpf_cmd)BPF_MAP_CREATE", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, enum bpf_cmd,
+ BTF_F_COMPACT | BTF_F_NONAME,
+ "BPF_MAP_CREATE",
+ BPF_MAP_CREATE);
+ TEST_BTF_DUMP_DATA(btf, d, str, enum bpf_cmd, 0,
+ "(enum bpf_cmd)BPF_MAP_CREATE",
+ BPF_MAP_CREATE);
+ TEST_BTF_DUMP_DATA(btf, d, str, enum bpf_cmd,
+ BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
+ "BPF_MAP_CREATE", 0);
+ TEST_BTF_DUMP_DATA(btf, d, str, enum bpf_cmd,
+ BTF_F_COMPACT | BTF_F_ZERO,
+ "(enum bpf_cmd)BPF_MAP_CREATE",
+ BPF_MAP_CREATE);
+ TEST_BTF_DUMP_DATA(btf, d, str, enum bpf_cmd,
+ BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
+ "BPF_MAP_CREATE", BPF_MAP_CREATE);
+ TEST_BTF_DUMP_DATA_C(btf, d, str, enum bpf_cmd, BTF_F_COMPACT, 2000);
+ TEST_BTF_DUMP_DATA(btf, d, str, enum bpf_cmd,
+ BTF_F_COMPACT | BTF_F_NONAME,
+ "2000", 2000);
+ TEST_BTF_DUMP_DATA(btf, d, str, enum bpf_cmd, 0,
+ "(enum bpf_cmd)2000", 2000);
+
+ TEST_BTF_DUMP_DATA_OVER(btf, d, str, enum bpf_cmd,
+ sizeof(enum bpf_cmd) - 1, "", BPF_MAP_CREATE);
+}
+
+static void test_btf_dump_struct_data(struct btf *btf, struct btf_dump *d,
+ char *str)
+{
+ DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
+ char zero_data[512] = { };
+ char type_data[512];
+ void *fops = type_data;
+ void *skb = type_data;
+ size_t type_sz;
+ __s32 type_id;
+ char *cmpstr;
+ int ret;
+
+ memset(type_data, 255, sizeof(type_data));
+
+ /* simple struct */
+ TEST_BTF_DUMP_DATA_C(btf, d, str, struct btf_enum, BTF_F_COMPACT,
+ {.name_off = (__u32)3,.val = (__s32)-1,});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct btf_enum,
+ BTF_F_COMPACT | BTF_F_NONAME,
+ "{3,-1,}",
+ { .name_off = 3, .val = -1,});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct btf_enum, 0,
+"(struct btf_enum){\n"
+" .name_off = (__u32)3,\n"
+" .val = (__s32)-1,\n"
+"}",
+ { .name_off = 3, .val = -1,});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct btf_enum,
+ BTF_F_COMPACT | BTF_F_NONAME,
+ "{-1,}",
+ { .name_off = 0, .val = -1,});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct btf_enum,
+ BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
+ "{0,-1,}",
+ { .name_off = 0, .val = -1,});
+ /* empty struct should be printed */
+ TEST_BTF_DUMP_DATA(btf, d, str, struct btf_enum, BTF_F_COMPACT,
+ "(struct btf_enum){}",
+ { .name_off = 0, .val = 0,});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct btf_enum,
+ BTF_F_COMPACT | BTF_F_NONAME,
+ "{}",
+ { .name_off = 0, .val = 0,});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct btf_enum, 0,
+"(struct btf_enum){\n"
+"}",
+ { .name_off = 0, .val = 0,});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct btf_enum,
+ BTF_F_COMPACT | BTF_F_ZERO,
+ "(struct btf_enum){.name_off = (__u32)0,.val = (__s32)0,}",
+ { .name_off = 0, .val = 0,});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct btf_enum,
+ BTF_F_ZERO,
+"(struct btf_enum){\n"
+" .name_off = (__u32)0,\n"
+" .val = (__s32)0,\n"
+"}",
+ { .name_off = 0, .val = 0,});
+
+ /* struct with pointers */
+ TEST_BTF_DUMP_DATA(btf, d, str, struct list_head, BTF_F_COMPACT,
+ "(struct list_head){.next = (struct list_head *)0x1,}",
+ { .next = (struct list_head *)1 });
+ TEST_BTF_DUMP_DATA(btf, d, str, struct list_head, 0,
+"(struct list_head){\n"
+" .next = (struct list_head *)0x1,\n"
+"}",
+ { .next = (struct list_head *)1 });
+ /* NULL pointer should not be displayed */
+ TEST_BTF_DUMP_DATA(btf, d, str, struct list_head, BTF_F_COMPACT,
+ "(struct list_head){}",
+ { .next = (struct list_head *)0 });
+ TEST_BTF_DUMP_DATA(btf, d, str, struct list_head, 0,
+"(struct list_head){\n"
+"}",
+ { .next = (struct list_head *)0 });
+
+ /* struct with function pointers */
+ type_id = btf__find_by_name(btf, "file_operations");
+ if (CHECK(type_id <= 0, "find type id",
+ "no 'struct file_operations' in BTF: %d\n", type_id))
+ return;
+ type_sz = btf__resolve_size(btf, type_id);
+ str[0] = '\0';
+
+ ret = btf_dump__dump_type_data(d, type_id, fops, type_sz, &opts);
+ if (CHECK(ret != type_sz,
+ "dump file_operations is successful",
+ "unexpected return value dumping file_operations '%s': %d\n",
+ str, ret))
+ return;
+
+ cmpstr =
+"(struct file_operations){\n"
+" .owner = (struct module *)0xffffffffffffffff,\n"
+" .llseek = (loff_t (*)(struct file *, loff_t, int))0xffffffffffffffff,";
+
+ if (!ASSERT_STRNEQ(str, cmpstr, strlen(cmpstr), "file_operations"))
+ return;
+
+ /* struct with char array */
+ TEST_BTF_DUMP_DATA(btf, d, str, struct bpf_prog_info, BTF_F_COMPACT,
+ "(struct bpf_prog_info){.name = (char[16])['f','o','o',],}",
+ { .name = "foo",});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct bpf_prog_info,
+ BTF_F_COMPACT | BTF_F_NONAME,
+ "{['f','o','o',],}",
+ {.name = "foo",});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct bpf_prog_info, 0,
+"(struct bpf_prog_info){\n"
+" .name = (char[16])[\n"
+" 'f',\n"
+" 'o',\n"
+" 'o',\n"
+" ],\n"
+"}",
+ {.name = "foo",});
+ /* leading null char means do not display string */
+ TEST_BTF_DUMP_DATA(btf, d, str, struct bpf_prog_info, BTF_F_COMPACT,
+ "(struct bpf_prog_info){}",
+ {.name = {'\0', 'f', 'o', 'o'}});
+ /* handle non-printable characters */
+ TEST_BTF_DUMP_DATA(btf, d, str, struct bpf_prog_info, BTF_F_COMPACT,
+ "(struct bpf_prog_info){.name = (char[16])[1,2,3,],}",
+ { .name = {1, 2, 3, 0}});
+
+ /* struct with non-char array */
+ TEST_BTF_DUMP_DATA(btf, d, str, struct __sk_buff, BTF_F_COMPACT,
+ "(struct __sk_buff){.cb = (__u32[5])[1,2,3,4,5,],}",
+ { .cb = {1, 2, 3, 4, 5,},});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct __sk_buff,
+ BTF_F_COMPACT | BTF_F_NONAME,
+ "{[1,2,3,4,5,],}",
+ { .cb = { 1, 2, 3, 4, 5},});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct __sk_buff, 0,
+"(struct __sk_buff){\n"
+" .cb = (__u32[5])[\n"
+" 1,\n"
+" 2,\n"
+" 3,\n"
+" 4,\n"
+" 5,\n"
+" ],\n"
+"}",
+ { .cb = { 1, 2, 3, 4, 5},});
+ /* For non-char, arrays, show non-zero values only */
+ TEST_BTF_DUMP_DATA(btf, d, str, struct __sk_buff, BTF_F_COMPACT,
+ "(struct __sk_buff){.cb = (__u32[5])[0,0,1,0,0,],}",
+ { .cb = { 0, 0, 1, 0, 0},});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct __sk_buff, 0,
+"(struct __sk_buff){\n"
+" .cb = (__u32[5])[\n"
+" 0,\n"
+" 0,\n"
+" 1,\n"
+" 0,\n"
+" 0,\n"
+" ],\n"
+"}",
+ { .cb = { 0, 0, 1, 0, 0},});
+
+ /* struct with bitfields */
+ TEST_BTF_DUMP_DATA_C(btf, d, str, struct bpf_insn, BTF_F_COMPACT,
+ {.code = (__u8)1,.dst_reg = (__u8)0x2,.src_reg = (__u8)0x3,.off = (__s16)4,.imm = (__s32)5,});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct bpf_insn,
+ BTF_F_COMPACT | BTF_F_NONAME,
+ "{1,0x2,0x3,4,5,}",
+ { .code = 1, .dst_reg = 0x2, .src_reg = 0x3, .off = 4,
+ .imm = 5,});
+ TEST_BTF_DUMP_DATA(btf, d, str, struct bpf_insn, 0,
+"(struct bpf_insn){\n"
+" .code = (__u8)1,\n"
+" .dst_reg = (__u8)0x2,\n"
+" .src_reg = (__u8)0x3,\n"
+" .off = (__s16)4,\n"
+" .imm = (__s32)5,\n"
+"}",
+ {.code = 1, .dst_reg = 2, .src_reg = 3, .off = 4, .imm = 5});
+
+ /* zeroed bitfields should not be displayed */
+ TEST_BTF_DUMP_DATA(btf, d, str, struct bpf_insn, BTF_F_COMPACT,
+ "(struct bpf_insn){.dst_reg = (__u8)0x1,}",
+ { .code = 0, .dst_reg = 1});
+
+ /* struct with enum bitfield */
+ type_id = btf__find_by_name(btf, "fs_context");
+ if (CHECK(type_id <= 0, "find fs_context",
+ "no 'struct fs_context' in BTF: %d\n", type_id))
+ return;
+ type_sz = btf__resolve_size(btf, type_id);
+ str[0] = '\0';
+
+ opts.emit_zeroes = true;
+ ret = btf_dump__dump_type_data(d, type_id, zero_data, type_sz, &opts);
+ if (CHECK(ret != type_sz,
+ "dump fs_context is successful",
+ "unexpected return value dumping fs_context '%s': %d\n",
+ str, ret))
+ return;
+
+ if (CHECK(strstr(str, "FS_CONTEXT_FOR_MOUNT") == NULL,
+ "verify enum value shown for bitfield",
+ "bitfield value not present in '%s'\n", str))
+ return;
+
+ /* struct with nested anon union */
+ TEST_BTF_DUMP_DATA(btf, d, str, struct bpf_sock_ops, BTF_F_COMPACT,
+ "(struct bpf_sock_ops){.op = (__u32)1,(union){.args = (__u32[4])[1,2,3,4,],.reply = (__u32)1,.replylong = (__u32[4])[1,2,3,4,],},}",
+ { .op = 1, .args = { 1, 2, 3, 4}});
+
+ /* union with nested struct */
+ TEST_BTF_DUMP_DATA(btf, d, str, union bpf_iter_link_info, BTF_F_COMPACT,
+ "(union bpf_iter_link_info){.map = (struct){.map_fd = (__u32)1,},}",
+ { .map = { .map_fd = 1 }});
+
+ /* struct skb with nested structs/unions; because type output is so
+ * complex, we don't do a string comparison, just verify we return
+ * the type size as the amount of data displayed.
+ */
+ type_id = btf__find_by_name(btf, "sk_buff");
+ if (CHECK(type_id <= 0, "find type id",
+ "no 'struct sk_buff' in BTF: %d\n", type_id))
+ return;
+ type_sz = btf__resolve_size(btf, type_id);
+ str[0] = '\0';
+
+ ret = btf_dump__dump_type_data(d, type_id, skb, type_sz, &opts);
+ if (CHECK(ret != type_sz,
+ "dump sk_buff is successful",
+ "unexpected return value dumping sk_buff '%s': %d\n",
+ str, ret))
+ return;
+
+ /* overflow bpf_sock_ops struct with final element nonzero/zero.
+ * Regardless of the value of the final field, we don't have all the
+ * data we need to display it, so we should trigger an overflow.
+ * In other words oveflow checking should trump "is field zero?"
+ * checks because if we've overflowed, it shouldn't matter what the
+ * field is - we can't trust its value so shouldn't display it.
+ */
+ TEST_BTF_DUMP_DATA_OVER(btf, d, str, struct bpf_sock_ops,
+ sizeof(struct bpf_sock_ops) - 1,
+ "(struct bpf_sock_ops){\n\t.op = (__u32)1,\n",
+ { .op = 1, .skb_tcp_flags = 2});
+ TEST_BTF_DUMP_DATA_OVER(btf, d, str, struct bpf_sock_ops,
+ sizeof(struct bpf_sock_ops) - 1,
+ "(struct bpf_sock_ops){\n\t.op = (__u32)1,\n",
+ { .op = 1, .skb_tcp_flags = 0});
+}
+
+static void test_btf_dump_var_data(struct btf *btf, struct btf_dump *d,
+ char *str)
+{
+ TEST_BTF_DUMP_VAR(btf, d, str, "cpu_number", int, BTF_F_COMPACT,
+ "int cpu_number = (int)100", 100);
+ TEST_BTF_DUMP_VAR(btf, d, str, "cpu_profile_flip", int, BTF_F_COMPACT,
+ "static int cpu_profile_flip = (int)2", 2);
+}
+
+static void test_btf_datasec(struct btf *btf, struct btf_dump *d, char *str,
+ const char *name, const char *expected_val,
+ void *data, size_t data_sz)
+{
+ DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
+ int ret = 0, cmp;
+ size_t secsize;
+ __s32 type_id;
+
+ opts.compact = true;
+
+ type_id = btf__find_by_name(btf, name);
+ if (CHECK(type_id <= 0, "find type id",
+ "no '%s' in BTF: %d\n", name, type_id))
+ return;
+
+ secsize = btf__resolve_size(btf, type_id);
+ if (CHECK(secsize != 0, "verify section size",
+ "unexpected section size %ld for %s\n", secsize, name))
+ return;
+
+ str[0] = '\0';
+ ret = btf_dump__dump_type_data(d, type_id, data, data_sz, &opts);
+ if (CHECK(ret != 0, "btf_dump__dump_type_data",
+ "failed/unexpected return value: %d\n", ret))
+ return;
+
+ cmp = strcmp(str, expected_val);
+ if (CHECK(cmp, "ensure expected/actual match",
+ "'%s' does not match expected '%s': %d\n",
+ str, expected_val, cmp))
+ return;
+}
+
+static void test_btf_dump_datasec_data(char *str)
+{
+ struct btf *btf = btf__parse("xdping_kern.o", NULL);
+ struct btf_dump_opts opts = { .ctx = str };
+ char license[4] = "GPL";
+ struct btf_dump *d;
+
+ if (CHECK(!btf, "get prog BTF", "xdping_kern.o BTF not found"))
+ return;
+
+ d = btf_dump__new(btf, NULL, &opts, btf_dump_snprintf);
+
+ if (CHECK(!d, "new dump", "could not create BTF dump"))
+ return;
+
+ test_btf_datasec(btf, d, str, "license",
+ "SEC(\"license\") char[4] _license = (char[4])['G','P','L',];",
+ license, sizeof(license));
+}
+
void test_btf_dump() {
+ char str[STRSIZE];
+ struct btf_dump_opts opts = { .ctx = str };
+ struct btf_dump *d;
+ struct btf *btf;
int i;
for (i = 0; i < ARRAY_SIZE(btf_dump_test_cases); i++) {
@@ -245,4 +859,34 @@ void test_btf_dump() {
}
if (test__start_subtest("btf_dump: incremental"))
test_btf_dump_incremental();
+
+ btf = libbpf_find_kernel_btf();
+ if (CHECK(!btf, "get kernel BTF", "no kernel BTF found"))
+ return;
+
+ d = btf_dump__new(btf, NULL, &opts, btf_dump_snprintf);
+
+ if (CHECK(!d, "new dump", "could not create BTF dump"))
+ return;
+
+ /* Verify type display for various types. */
+ if (test__start_subtest("btf_dump: int_data"))
+ test_btf_dump_int_data(btf, d, str);
+ if (test__start_subtest("btf_dump: float_data"))
+ test_btf_dump_float_data(btf, d, str);
+ if (test__start_subtest("btf_dump: char_data"))
+ test_btf_dump_char_data(btf, d, str);
+ if (test__start_subtest("btf_dump: typedef_data"))
+ test_btf_dump_typedef_data(btf, d, str);
+ if (test__start_subtest("btf_dump: enum_data"))
+ test_btf_dump_enum_data(btf, d, str);
+ if (test__start_subtest("btf_dump: struct_data"))
+ test_btf_dump_struct_data(btf, d, str);
+ if (test__start_subtest("btf_dump: var_data"))
+ test_btf_dump_var_data(btf, d, str);
+ btf_dump__free(d);
+ btf__free(btf);
+
+ if (test__start_subtest("btf_dump: datasec_data"))
+ test_btf_dump_datasec_data(str);
}
--
1.8.3.1