static void tb_test_path_max_length_walk()

in test.c [681:782]

• 70 lines of code
• 1 McCabe index (conditional complexity)

static void tb_test_path_max_length_walk(struct kunit *test)
{
	struct tb_switch *host, *dev1, *dev2, *dev3, *dev4, *dev5, *dev6;
	struct tb_switch *dev7, *dev8, *dev9, *dev10, *dev11, *dev12;
	struct tb_port *src_port, *dst_port, *p;
	int i;

	/*
	 * Walks from Device #6 DP IN to Device #12 DP OUT.
	 *
	 *          [Host]
	 *         1 /  \ 3
	 *        1 /    \ 1
	 * [Device #1]   [Device #7]
	 *     3 |           | 3
	 *     1 |           | 1
	 * [Device #2]   [Device #8]
	 *     3 |           | 3
	 *     1 |           | 1
	 * [Device #3]   [Device #9]
	 *     3 |           | 3
	 *     1 |           | 1
	 * [Device #4]   [Device #10]
	 *     3 |           | 3
	 *     1 |           | 1
	 * [Device #5]   [Device #11]
	 *     3 |           | 3
	 *     1 |           | 1
	 * [Device #6]   [Device #12]
	 */
	static const struct port_expectation test_data[] = {
		{ .route = 0x30303030301, .port = 13, .type = TB_TYPE_DP_HDMI_IN },
		{ .route = 0x30303030301, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x303030301, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x303030301, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x3030301, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x3030301, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x30301, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x30301, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x301, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x301, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x1, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x1, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x0, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x0, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x3, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x3, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x303, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x303, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x30303, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x30303, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x3030303, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x3030303, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x303030303, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x303030303, .port = 3, .type = TB_TYPE_PORT },
		{ .route = 0x30303030303, .port = 1, .type = TB_TYPE_PORT },
		{ .route = 0x30303030303, .port = 13, .type = TB_TYPE_DP_HDMI_OUT },
	};

	host = alloc_host(test);
	dev1 = alloc_dev_default(test, host, 0x1, true);
	dev2 = alloc_dev_default(test, dev1, 0x301, true);
	dev3 = alloc_dev_default(test, dev2, 0x30301, true);
	dev4 = alloc_dev_default(test, dev3, 0x3030301, true);
	dev5 = alloc_dev_default(test, dev4, 0x303030301, true);
	dev6 = alloc_dev_with_dpin(test, dev5, 0x30303030301, true);
	dev7 = alloc_dev_default(test, host, 0x3, true);
	dev8 = alloc_dev_default(test, dev7, 0x303, true);
	dev9 = alloc_dev_default(test, dev8, 0x30303, true);
	dev10 = alloc_dev_default(test, dev9, 0x3030303, true);
	dev11 = alloc_dev_default(test, dev10, 0x303030303, true);
	dev12 = alloc_dev_default(test, dev11, 0x30303030303, true);

	src_port = &dev6->ports[13];
	dst_port = &dev12->ports[13];

	/* Walk both directions */

	i = 0;
	tb_for_each_port_on_path(src_port, dst_port, p) {
		KUNIT_EXPECT_TRUE(test, i < ARRAY_SIZE(test_data));
		KUNIT_EXPECT_EQ(test, tb_route(p->sw), test_data[i].route);
		KUNIT_EXPECT_EQ(test, p->port, test_data[i].port);
		KUNIT_EXPECT_EQ(test, (enum tb_port_type)p->config.type,
				test_data[i].type);
		i++;
	}

	KUNIT_EXPECT_EQ(test, i, ARRAY_SIZE(test_data));

	i = ARRAY_SIZE(test_data) - 1;
	tb_for_each_port_on_path(dst_port, src_port, p) {
		KUNIT_EXPECT_TRUE(test, i < ARRAY_SIZE(test_data));
		KUNIT_EXPECT_EQ(test, tb_route(p->sw), test_data[i].route);
		KUNIT_EXPECT_EQ(test, p->port, test_data[i].port);
		KUNIT_EXPECT_EQ(test, (enum tb_port_type)p->config.type,
				test_data[i].type);
		i--;
	}

	KUNIT_EXPECT_EQ(test, i, -1);
}