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

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/test_csum_diff.c

File Facts

System: Linux kernel
Corpus path: tools/testing/selftests/bpf/prog_tests/test_csum_diff.c
Extension: .c
Size: 7926 bytes
Lines: 409
Domain: Support Tooling And Documentation
Bucket: tools
Inferred role: Support Tooling And Documentation: implementation source
Status: source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

test_progs.h
csum_diff_test.skel.h

Detected Declarations

struct testcase
function trigger_csum_diff
function test_csum_diff
function test_test_csum_diff

Annotated Snippet

struct testcase {
	unsigned long long to_buff[BUFF_SZ / 8];
	unsigned int to_buff_len;
	unsigned long long from_buff[BUFF_SZ / 8];
	unsigned int from_buff_len;
	unsigned short seed;
	unsigned short result;
};

#define NUM_PUSH_TESTS 4

struct testcase push_tests[NUM_PUSH_TESTS] = {
	{
		.to_buff = {
			0xdeadbeefdeadbeef,
		},
		.to_buff_len = 8,
		.from_buff = {},
		.from_buff_len = 0,
		.seed = 0,
		.result = 0x3b3b
	},
	{
		.to_buff = {
			0xdeadbeefdeadbeef,
			0xbeefdeadbeefdead,
		},
		.to_buff_len = 16,
		.from_buff = {},
		.from_buff_len = 0,
		.seed = 0x1234,
		.result = 0x88aa
	},
	{
		.to_buff = {
			0xdeadbeefdeadbeef,
			0xbeefdeadbeefdead,
		},
		.to_buff_len = 15,
		.from_buff = {},
		.from_buff_len = 0,
		.seed = 0x1234,
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		.result = 0xcaa9
#else
		.result = 0x87fd
#endif
	},
	{
		.to_buff = {
			0x327b23c66b8b4567,
			0x66334873643c9869,
			0x19495cff74b0dc51,
			0x625558ec2ae8944a,
			0x46e87ccd238e1f29,
			0x507ed7ab3d1b58ba,
			0x41b71efb2eb141f2,
			0x7545e14679e2a9e3,
			0x5bd062c2515f007c,
			0x4db127f812200854,
			0x1f16e9e80216231b,
			0x66ef438d1190cde7,
			0x3352255a140e0f76,
			0x0ded7263109cf92e,
			0x1befd79f7fdcc233,
			0x6b68079a41a7c4c9,
			0x25e45d324e6afb66,
			0x431bd7b7519b500d,
			0x7c83e4583f2dba31,
			0x62bbd95a257130a3,
			0x628c895d436c6125,
			0x721da317333ab105,
			0x2d1d5ae92443a858,
			0x75a2a8d46763845e,
			0x79838cb208edbdab,
			0x0b03e0c64353d0cd,
			0x54e49eb4189a769b,
			0x2ca8861171f32454,
			0x02901d820836c40e,
			0x081386413a95f874,
			0x7c3dbd3d1e7ff521,
			0x6ceaf087737b8ddc,
			0x4516dde922221a70,
			0x614fd4a13006c83e,
			0x5577f8e1419ac241,
			0x05072367440badfc,
			0x77465f013804823e,
			0x5c482a977724c67e,
			0x5e884adc2463b9ea,
			0x2d51779651ead36b,

Annotation

Immediate include surface: `test_progs.h`, `csum_diff_test.skel.h`.
Detected declarations: `struct testcase`, `function trigger_csum_diff`, `function test_csum_diff`, `function test_test_csum_diff`.
Atlas domain: Support Tooling And Documentation / tools.
Implementation status: source implementation candidate.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.