// SPDX-License-Identifier: GPL-2.0
/* Copyright Amazon.com Inc. or its affiliates */
#include <test_progs.h>
#include "csum_diff_test.skel.h"

#define BUFF_SZ 512

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,
			0x153ea438580bd78f,
			0x70a64e2a3855585c,
			0x2a487cb06a2342ec,
			0x725a06fb1d4ed43b,
			0x57e4ccaf2cd89a32,
			0x4b588f547a6d8d3c,
			0x6de91b18542289ec,
			0x7644a45c38437fdb,
			0x684a481a32fff902,
			0x749abb43579478fe,
			0x1ba026fa3dc240fb,
			0x75c6c33a79a1deaa,
			0x70c6a52912e685fb,
			0x374a3fe6520eedd1,
			0x23f9c13c4f4ef005,
			0x275ac794649bb77c,
			0x1cf10fd839386575,
			0x235ba861180115be,
			0x354fe9f947398c89,
			0x741226bb15b5af5c,
			0x10233c990d34b6a8,
			0x615740953f6ab60f,
			0x77ae35eb7e0c57b1,
			0x310c50b3579be4f1,
		},
		.to_buff_len = 512,
		.from_buff = {},
		.from_buff_len = 0,
		.seed = 0xffff,
		.result = 0xca45
	},
};

#define NUM_PULL_TESTS 4

struct testcase pull_tests[NUM_PULL_TESTS] = {
	{
		.from_buff = {
			0xdeadbeefdeadbeef,
		},
		.from_buff_len = 8,
		.to_buff = {},
		.to_buff_len = 0,
		.seed = 0,
		.result = 0xc4c4
	},
	{
		.from_buff = {
			0xdeadbeefdeadbeef,
			0xbeefdeadbeefdead,
		},
		.from_buff_len = 16,
		.to_buff = {},
		.to_buff_len = 0,
		.seed = 0x1234,
		.result = 0x9bbd
	},
	{
		.from_buff = {
			0xdeadbeefdeadbeef,
			0xbeefdeadbeefdead,
		},
		.from_buff_len = 15,
		.to_buff = {},
		.to_buff_len = 0,
		.seed = 0x1234,
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		.result = 0x59be
#else
		.result = 0x9c6a
#endif
	},
	{
		.from_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,
			0x153ea438580bd78f,
			0x70a64e2a3855585c,
			0x2a487cb06a2342ec,
			0x725a06fb1d4ed43b,
			0x57e4ccaf2cd89a32,
			0x4b588f547a6d8d3c,
			0x6de91b18542289ec,
			0x7644a45c38437fdb,
			0x684a481a32fff902,
			0x749abb43579478fe,
			0x1ba026fa3dc240fb,
			0x75c6c33a79a1deaa,
			0x70c6a52912e685fb,
			0x374a3fe6520eedd1,
			0x23f9c13c4f4ef005,
			0x275ac794649bb77c,
			0x1cf10fd839386575,
			0x235ba861180115be,
			0x354fe9f947398c89,
			0x741226bb15b5af5c,
			0x10233c990d34b6a8,
			0x615740953f6ab60f,
			0x77ae35eb7e0c57b1,
			0x310c50b3579be4f1,
		},
		.from_buff_len = 512,
		.to_buff = {},
		.to_buff_len = 0,
		.seed = 0xffff,
		.result = 0x35ba
	},
};

#define NUM_DIFF_TESTS 4

struct testcase diff_tests[NUM_DIFF_TESTS] = {
	{
		.from_buff = {
			0xdeadbeefdeadbeef,
		},
		.from_buff_len = 8,
		.to_buff = {
			0xabababababababab,
		},
		.to_buff_len = 8,
		.seed = 0,
		.result = 0x7373
	},
	{
		.from_buff = {
			0xdeadbeefdeadbeef,
		},
		.from_buff_len = 7,
		.to_buff = {
			0xabababababababab,
		},
		.to_buff_len = 7,
		.seed = 0,
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		.result = 0xa673
#else
		.result = 0x73b7
#endif
	},
	{
		.from_buff = {
			0,
		},
		.from_buff_len = 8,
		.to_buff = {
			0xabababababababab,
		},
		.to_buff_len = 8,
		.seed = 0,
		.result = 0xaeae
	},
	{
		.from_buff = {
			0xdeadbeefdeadbeef
		},
		.from_buff_len = 8,
		.to_buff = {
			0,
		},
		.to_buff_len = 8,
		.seed = 0xffff,
		.result = 0xc4c4
	},
};

#define NUM_EDGE_TESTS 4

struct testcase edge_tests[NUM_EDGE_TESTS] = {
	{
		.from_buff = {},
		.from_buff_len = 0,
		.to_buff = {},
		.to_buff_len = 0,
		.seed = 0,
		.result = 0
	},
	{
		.from_buff = {
			0x1234
		},
		.from_buff_len = 0,
		.to_buff = {
			0x1234
		},
		.to_buff_len = 0,
		.seed = 0,
		.result = 0
	},
	{
		.from_buff = {},
		.from_buff_len = 0,
		.to_buff = {},
		.to_buff_len = 0,
		.seed = 0x1234,
		.result = 0x1234
	},
	{
		.from_buff = {},
		.from_buff_len = 512,
		.to_buff = {},
		.to_buff_len = 0,
		.seed = 0xffff,
		.result = 0xffff
	},
};

static unsigned short trigger_csum_diff(const struct csum_diff_test *skel)
{
	u8 tmp_out[64 << 2] = {};
	u8 tmp_in[64] = {};
	int err;
	int pfd;

	LIBBPF_OPTS(bpf_test_run_opts, topts,
		.data_in = tmp_in,
		.data_size_in = sizeof(tmp_in),
		.data_out = tmp_out,
		.data_size_out = sizeof(tmp_out),
		.repeat = 1,
	);
	pfd = bpf_program__fd(skel->progs.compute_checksum);
	err = bpf_prog_test_run_opts(pfd, &topts);
	if (err)
		return -1;

	return skel->bss->result;
}

static void test_csum_diff(struct testcase *tests, int num_tests)
{
	struct csum_diff_test *skel;
	unsigned short got;
	int err;

	for (int i = 0; i < num_tests; i++) {
		skel = csum_diff_test__open();
		if (!ASSERT_OK_PTR(skel, "csum_diff_test open"))
			return;

		skel->rodata->to_buff_len = tests[i].to_buff_len;
		skel->rodata->from_buff_len = tests[i].from_buff_len;

		err = csum_diff_test__load(skel);
		if (!ASSERT_EQ(err, 0, "csum_diff_test load"))
			goto out;

		memcpy(skel->bss->to_buff, tests[i].to_buff, tests[i].to_buff_len);
		memcpy(skel->bss->from_buff, tests[i].from_buff, tests[i].from_buff_len);
		skel->bss->seed = tests[i].seed;

		got = trigger_csum_diff(skel);
		ASSERT_EQ(got, tests[i].result, "csum_diff result");

		csum_diff_test__destroy(skel);
	}

	return;
out:
	csum_diff_test__destroy(skel);
}

void test_test_csum_diff(void)
{
	if (test__start_subtest("csum_diff_push"))
		test_csum_diff(push_tests, NUM_PUSH_TESTS);
	if (test__start_subtest("csum_diff_pull"))
		test_csum_diff(pull_tests, NUM_PULL_TESTS);
	if (test__start_subtest("csum_diff_diff"))
		test_csum_diff(diff_tests, NUM_DIFF_TESTS);
	if (test__start_subtest("csum_diff_edge"))
		test_csum_diff(edge_tests, NUM_EDGE_TESTS);
}