// SPDX-License-Identifier: GPL-2.0
/*
 * KUnit tests
 *
 * Copyright (C) 2020, Intel Corporation
 * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
 */

#include <kunit/test.h>
#include <linux/idr.h>

#include "tb.h"
#include "tunnel.h"

static int __ida_init(struct kunit_resource *res, void *context)
{
        struct ida *ida = context;

        ida_init(ida);
        res->data = ida;
        return 0;
}

static void __ida_destroy(struct kunit_resource *res)
{
        struct ida *ida = res->data;

        ida_destroy(ida);
}

static void kunit_ida_init(struct kunit *test, struct ida *ida)
{
        kunit_alloc_resource(test, __ida_init, __ida_destroy, GFP_KERNEL, ida);
}

static struct tb_switch *alloc_switch(struct kunit *test, u64 route,
                                      u8 upstream_port, u8 max_port_number)
{
        struct tb_switch *sw;
        size_t size;
        int i;

        sw = kunit_kzalloc(test, sizeof(*sw), GFP_KERNEL);
        if (!sw)
                return NULL;

        sw->config.upstream_port_number = upstream_port;
        sw->config.depth = tb_route_length(route);
        sw->config.route_hi = upper_32_bits(route);
        sw->config.route_lo = lower_32_bits(route);
        sw->config.enabled = 0;
        sw->config.max_port_number = max_port_number;

        size = (sw->config.max_port_number + 1) * sizeof(*sw->ports);
        sw->ports = kunit_kzalloc(test, size, GFP_KERNEL);
        if (!sw->ports)
                return NULL;

        for (i = 0; i <= sw->config.max_port_number; i++) {
                sw->ports[i].sw = sw;
                sw->ports[i].port = i;
                sw->ports[i].config.port_number = i;
                if (i) {
                        kunit_ida_init(test, &sw->ports[i].in_hopids);
                        kunit_ida_init(test, &sw->ports[i].out_hopids);
                }
        }

        return sw;
}

static struct tb_switch *alloc_host(struct kunit *test)
{
        struct tb_switch *sw;

        sw = alloc_switch(test, 0, 7, 13);
        if (!sw)
                return NULL;

        sw->config.vendor_id = 0x8086;
        sw->config.device_id = 0x9a1b;

        sw->ports[0].config.type = TB_TYPE_PORT;
        sw->ports[0].config.max_in_hop_id = 7;
        sw->ports[0].config.max_out_hop_id = 7;

        sw->ports[1].config.type = TB_TYPE_PORT;
        sw->ports[1].config.max_in_hop_id = 19;
        sw->ports[1].config.max_out_hop_id = 19;
        sw->ports[1].total_credits = 60;
        sw->ports[1].ctl_credits = 2;
        sw->ports[1].dual_link_port = &sw->ports[2];

        sw->ports[2].config.type = TB_TYPE_PORT;
        sw->ports[2].config.max_in_hop_id = 19;
        sw->ports[2].config.max_out_hop_id = 19;
        sw->ports[2].total_credits = 60;
        sw->ports[2].ctl_credits = 2;
        sw->ports[2].dual_link_port = &sw->ports[1];
        sw->ports[2].link_nr = 1;

        sw->ports[3].config.type = TB_TYPE_PORT;
        sw->ports[3].config.max_in_hop_id = 19;
        sw->ports[3].config.max_out_hop_id = 19;
        sw->ports[3].total_credits = 60;
        sw->ports[3].ctl_credits = 2;
        sw->ports[3].dual_link_port = &sw->ports[4];

        sw->ports[4].config.type = TB_TYPE_PORT;
        sw->ports[4].config.max_in_hop_id = 19;
        sw->ports[4].config.max_out_hop_id = 19;
        sw->ports[4].total_credits = 60;
        sw->ports[4].ctl_credits = 2;
        sw->ports[4].dual_link_port = &sw->ports[3];
        sw->ports[4].link_nr = 1;

        sw->ports[5].config.type = TB_TYPE_DP_HDMI_IN;
        sw->ports[5].config.max_in_hop_id = 9;
        sw->ports[5].config.max_out_hop_id = 9;
        sw->ports[5].cap_adap = -1;

        sw->ports[6].config.type = TB_TYPE_DP_HDMI_IN;
        sw->ports[6].config.max_in_hop_id = 9;
        sw->ports[6].config.max_out_hop_id = 9;
        sw->ports[6].cap_adap = -1;

        sw->ports[7].config.type = TB_TYPE_NHI;
        sw->ports[7].config.max_in_hop_id = 11;
        sw->ports[7].config.max_out_hop_id = 11;
        sw->ports[7].config.nfc_credits = 0x41800000;

        sw->ports[8].config.type = TB_TYPE_PCIE_DOWN;
        sw->ports[8].config.max_in_hop_id = 8;
        sw->ports[8].config.max_out_hop_id = 8;

        sw->ports[9].config.type = TB_TYPE_PCIE_DOWN;
        sw->ports[9].config.max_in_hop_id = 8;
        sw->ports[9].config.max_out_hop_id = 8;

        sw->ports[10].disabled = true;
        sw->ports[11].disabled = true;

        sw->ports[12].config.type = TB_TYPE_USB3_DOWN;
        sw->ports[12].config.max_in_hop_id = 8;
        sw->ports[12].config.max_out_hop_id = 8;

        sw->ports[13].config.type = TB_TYPE_USB3_DOWN;
        sw->ports[13].config.max_in_hop_id = 8;
        sw->ports[13].config.max_out_hop_id = 8;

        return sw;
}

static struct tb_switch *alloc_host_usb4(struct kunit *test)
{
        struct tb_switch *sw;

        sw = alloc_host(test);
        if (!sw)
                return NULL;

        sw->generation = 4;
        sw->credit_allocation = true;
        sw->max_usb3_credits = 32;
        sw->min_dp_aux_credits = 1;
        sw->min_dp_main_credits = 0;
        sw->max_pcie_credits = 64;
        sw->max_dma_credits = 14;

        return sw;
}

static struct tb_switch *alloc_dev_default(struct kunit *test,
                                           struct tb_switch *parent,
                                           u64 route, bool bonded)
{
        struct tb_port *port, *upstream_port;
        struct tb_switch *sw;

        sw = alloc_switch(test, route, 1, 19);
        if (!sw)
                return NULL;

        sw->config.vendor_id = 0x8086;
        sw->config.device_id = 0x15ef;

        sw->ports[0].config.type = TB_TYPE_PORT;
        sw->ports[0].config.max_in_hop_id = 8;
        sw->ports[0].config.max_out_hop_id = 8;

        sw->ports[1].config.type = TB_TYPE_PORT;
        sw->ports[1].config.max_in_hop_id = 19;
        sw->ports[1].config.max_out_hop_id = 19;
        sw->ports[1].total_credits = 60;
        sw->ports[1].ctl_credits = 2;
        sw->ports[1].dual_link_port = &sw->ports[2];

        sw->ports[2].config.type = TB_TYPE_PORT;
        sw->ports[2].config.max_in_hop_id = 19;
        sw->ports[2].config.max_out_hop_id = 19;
        sw->ports[2].total_credits = 60;
        sw->ports[2].ctl_credits = 2;
        sw->ports[2].dual_link_port = &sw->ports[1];
        sw->ports[2].link_nr = 1;

        sw->ports[3].config.type = TB_TYPE_PORT;
        sw->ports[3].config.max_in_hop_id = 19;
        sw->ports[3].config.max_out_hop_id = 19;
        sw->ports[3].total_credits = 60;
        sw->ports[3].ctl_credits = 2;
        sw->ports[3].dual_link_port = &sw->ports[4];

        sw->ports[4].config.type = TB_TYPE_PORT;
        sw->ports[4].config.max_in_hop_id = 19;
        sw->ports[4].config.max_out_hop_id = 19;
        sw->ports[4].total_credits = 60;
        sw->ports[4].ctl_credits = 2;
        sw->ports[4].dual_link_port = &sw->ports[3];
        sw->ports[4].link_nr = 1;

        sw->ports[5].config.type = TB_TYPE_PORT;
        sw->ports[5].config.max_in_hop_id = 19;
        sw->ports[5].config.max_out_hop_id = 19;
        sw->ports[5].total_credits = 60;
        sw->ports[5].ctl_credits = 2;
        sw->ports[5].dual_link_port = &sw->ports[6];

        sw->ports[6].config.type = TB_TYPE_PORT;
        sw->ports[6].config.max_in_hop_id = 19;
        sw->ports[6].config.max_out_hop_id = 19;
        sw->ports[6].total_credits = 60;
        sw->ports[6].ctl_credits = 2;
        sw->ports[6].dual_link_port = &sw->ports[5];
        sw->ports[6].link_nr = 1;

        sw->ports[7].config.type = TB_TYPE_PORT;
        sw->ports[7].config.max_in_hop_id = 19;
        sw->ports[7].config.max_out_hop_id = 19;
        sw->ports[7].total_credits = 60;
        sw->ports[7].ctl_credits = 2;
        sw->ports[7].dual_link_port = &sw->ports[8];

        sw->ports[8].config.type = TB_TYPE_PORT;
        sw->ports[8].config.max_in_hop_id = 19;
        sw->ports[8].config.max_out_hop_id = 19;
        sw->ports[8].total_credits = 60;
        sw->ports[8].ctl_credits = 2;
        sw->ports[8].dual_link_port = &sw->ports[7];
        sw->ports[8].link_nr = 1;

        sw->ports[9].config.type = TB_TYPE_PCIE_UP;
        sw->ports[9].config.max_in_hop_id = 8;
        sw->ports[9].config.max_out_hop_id = 8;

        sw->ports[10].config.type = TB_TYPE_PCIE_DOWN;
        sw->ports[10].config.max_in_hop_id = 8;
        sw->ports[10].config.max_out_hop_id = 8;

        sw->ports[11].config.type = TB_TYPE_PCIE_DOWN;
        sw->ports[11].config.max_in_hop_id = 8;
        sw->ports[11].config.max_out_hop_id = 8;

        sw->ports[12].config.type = TB_TYPE_PCIE_DOWN;
        sw->ports[12].config.max_in_hop_id = 8;
        sw->ports[12].config.max_out_hop_id = 8;

        sw->ports[13].config.type = TB_TYPE_DP_HDMI_OUT;
        sw->ports[13].config.max_in_hop_id = 9;
        sw->ports[13].config.max_out_hop_id = 9;
        sw->ports[13].cap_adap = -1;

        sw->ports[14].config.type = TB_TYPE_DP_HDMI_OUT;
        sw->ports[14].config.max_in_hop_id = 9;
        sw->ports[14].config.max_out_hop_id = 9;
        sw->ports[14].cap_adap = -1;

        sw->ports[15].disabled = true;

        sw->ports[16].config.type = TB_TYPE_USB3_UP;
        sw->ports[16].config.max_in_hop_id = 8;
        sw->ports[16].config.max_out_hop_id = 8;

        sw->ports[17].config.type = TB_TYPE_USB3_DOWN;
        sw->ports[17].config.max_in_hop_id = 8;
        sw->ports[17].config.max_out_hop_id = 8;

        sw->ports[18].config.type = TB_TYPE_USB3_DOWN;
        sw->ports[18].config.max_in_hop_id = 8;
        sw->ports[18].config.max_out_hop_id = 8;

        sw->ports[19].config.type = TB_TYPE_USB3_DOWN;
        sw->ports[19].config.max_in_hop_id = 8;
        sw->ports[19].config.max_out_hop_id = 8;

        if (!parent)
                return sw;

        /* Link them */
        upstream_port = tb_upstream_port(sw);
        port = tb_port_at(route, parent);
        port->remote = upstream_port;
        upstream_port->remote = port;
        if (port->dual_link_port && upstream_port->dual_link_port) {
                port->dual_link_port->remote = upstream_port->dual_link_port;
                upstream_port->dual_link_port->remote = port->dual_link_port;

                if (bonded) {
                        /* Bonding is used */
                        port->bonded = true;
                        port->total_credits *= 2;
                        port->dual_link_port->bonded = true;
                        port->dual_link_port->total_credits = 0;
                        upstream_port->bonded = true;
                        upstream_port->total_credits *= 2;
                        upstream_port->dual_link_port->bonded = true;
                        upstream_port->dual_link_port->total_credits = 0;
                }
        }

        return sw;
}

static struct tb_switch *alloc_dev_with_dpin(struct kunit *test,
                                             struct tb_switch *parent,
                                             u64 route, bool bonded)
{
        struct tb_switch *sw;

        sw = alloc_dev_default(test, parent, route, bonded);
        if (!sw)
                return NULL;

        sw->ports[13].config.type = TB_TYPE_DP_HDMI_IN;
        sw->ports[13].config.max_in_hop_id = 9;
        sw->ports[13].config.max_out_hop_id = 9;

        sw->ports[14].config.type = TB_TYPE_DP_HDMI_IN;
        sw->ports[14].config.max_in_hop_id = 9;
        sw->ports[14].config.max_out_hop_id = 9;

        return sw;
}

static struct tb_switch *alloc_dev_usb4(struct kunit *test,
                                        struct tb_switch *parent,
                                        u64 route, bool bonded)
{
        struct tb_switch *sw;

        sw = alloc_dev_default(test, parent, route, bonded);
        if (!sw)
                return NULL;

        sw->generation = 4;
        sw->credit_allocation = true;
        sw->max_usb3_credits = 14;
        sw->min_dp_aux_credits = 1;
        sw->min_dp_main_credits = 18;
        sw->max_pcie_credits = 32;
        sw->max_dma_credits = 14;

        return sw;
}

static void tb_test_path_basic(struct kunit *test)
{
        struct tb_port *src_port, *dst_port, *p;
        struct tb_switch *host;

        host = alloc_host(test);

        src_port = &host->ports[5];
        dst_port = src_port;

        p = tb_next_port_on_path(src_port, dst_port, NULL);
        KUNIT_EXPECT_PTR_EQ(test, p, dst_port);

        p = tb_next_port_on_path(src_port, dst_port, p);
        KUNIT_EXPECT_TRUE(test, !p);
}

static void tb_test_path_not_connected_walk(struct kunit *test)
{
        struct tb_port *src_port, *dst_port, *p;
        struct tb_switch *host, *dev;

        host = alloc_host(test);
        /* No connection between host and dev */
        dev = alloc_dev_default(test, NULL, 3, true);

        src_port = &host->ports[12];
        dst_port = &dev->ports[16];

        p = tb_next_port_on_path(src_port, dst_port, NULL);
        KUNIT_EXPECT_PTR_EQ(test, p, src_port);

        p = tb_next_port_on_path(src_port, dst_port, p);
        KUNIT_EXPECT_PTR_EQ(test, p, &host->ports[3]);

        p = tb_next_port_on_path(src_port, dst_port, p);
        KUNIT_EXPECT_TRUE(test, !p);

        /* Other direction */

        p = tb_next_port_on_path(dst_port, src_port, NULL);
        KUNIT_EXPECT_PTR_EQ(test, p, dst_port);

        p = tb_next_port_on_path(dst_port, src_port, p);
        KUNIT_EXPECT_PTR_EQ(test, p, &dev->ports[1]);

        p = tb_next_port_on_path(dst_port, src_port, p);
        KUNIT_EXPECT_TRUE(test, !p);
}

struct port_expectation {
        u64 route;
        u8 port;
        enum tb_port_type type;
};

static void tb_test_path_single_hop_walk(struct kunit *test)
{
        /*
         * Walks from Host PCIe downstream port to Device #1 PCIe
         * upstream port.
         *
         *   [Host]
         *   1 |
         *   1 |
         *  [Device]
         */
        static const struct port_expectation test_data[] = {
                { .route = 0x0, .port = 8, .type = TB_TYPE_PCIE_DOWN },
                { .route = 0x0, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x1, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x1, .port = 9, .type = TB_TYPE_PCIE_UP },
        };
        struct tb_port *src_port, *dst_port, *p;
        struct tb_switch *host, *dev;
        int i;

        host = alloc_host(test);
        dev = alloc_dev_default(test, host, 1, true);

        src_port = &host->ports[8];
        dst_port = &dev->ports[9];

        /* 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);
}

static void tb_test_path_daisy_chain_walk(struct kunit *test)
{
        /*
         * Walks from Host DP IN to Device #2 DP OUT.
         *
         *           [Host]
         *            1 |
         *            1 |
         *         [Device #1]
         *       3 /
         *      1 /
         * [Device #2]
         */
        static const struct port_expectation test_data[] = {
                { .route = 0x0, .port = 5, .type = TB_TYPE_DP_HDMI_IN },
                { .route = 0x0, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x1, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x1, .port = 3, .type = TB_TYPE_PORT },
                { .route = 0x301, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x301, .port = 13, .type = TB_TYPE_DP_HDMI_OUT },
        };
        struct tb_port *src_port, *dst_port, *p;
        struct tb_switch *host, *dev1, *dev2;
        int i;

        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, true);
        dev2 = alloc_dev_default(test, dev1, 0x301, true);

        src_port = &host->ports[5];
        dst_port = &dev2->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);
}

static void tb_test_path_simple_tree_walk(struct kunit *test)
{
        /*
         * Walks from Host DP IN to Device #3 DP OUT.
         *
         *           [Host]
         *            1 |
         *            1 |
         *         [Device #1]
         *       3 /   | 5  \ 7
         *      1 /    |     \ 1
         * [Device #2] |    [Device #4]
         *             | 1
         *         [Device #3]
         */
        static const struct port_expectation test_data[] = {
                { .route = 0x0, .port = 5, .type = TB_TYPE_DP_HDMI_IN },
                { .route = 0x0, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x1, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x1, .port = 5, .type = TB_TYPE_PORT },
                { .route = 0x501, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x501, .port = 13, .type = TB_TYPE_DP_HDMI_OUT },
        };
        struct tb_port *src_port, *dst_port, *p;
        struct tb_switch *host, *dev1, *dev3;
        int i;

        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, true);
        alloc_dev_default(test, dev1, 0x301, true);
        dev3 = alloc_dev_default(test, dev1, 0x501, true);
        alloc_dev_default(test, dev1, 0x701, true);

        src_port = &host->ports[5];
        dst_port = &dev3->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);
}

static void tb_test_path_complex_tree_walk(struct kunit *test)
{
        /*
         * Walks from Device #3 DP IN to Device #9 DP OUT.
         *
         *           [Host]
         *            1 |
         *            1 |
         *         [Device #1]
         *       3 /   | 5  \ 7
         *      1 /    |     \ 1
         * [Device #2] |    [Device #5]
         *    5 |      | 1         \ 7
         *    1 |  [Device #4]      \ 1
         * [Device #3]             [Device #6]
         *                       3 /
         *                      1 /
         *                    [Device #7]
         *                  3 /      | 5
         *                 1 /       |
         *               [Device #8] | 1
         *                       [Device #9]
         */
        static const struct port_expectation test_data[] = {
                { .route = 0x50301, .port = 13, .type = TB_TYPE_DP_HDMI_IN },
                { .route = 0x50301, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x301, .port = 5, .type = TB_TYPE_PORT },
                { .route = 0x301, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x1, .port = 3, .type = TB_TYPE_PORT },
                { .route = 0x1, .port = 7, .type = TB_TYPE_PORT },
                { .route = 0x701, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x701, .port = 7, .type = TB_TYPE_PORT },
                { .route = 0x70701, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x70701, .port = 3, .type = TB_TYPE_PORT },
                { .route = 0x3070701, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x3070701, .port = 5, .type = TB_TYPE_PORT },
                { .route = 0x503070701, .port = 1, .type = TB_TYPE_PORT },
                { .route = 0x503070701, .port = 14, .type = TB_TYPE_DP_HDMI_OUT },
        };
        struct tb_switch *host, *dev1, *dev2, *dev3, *dev5, *dev6, *dev7, *dev9;
        struct tb_port *src_port, *dst_port, *p;
        int i;

        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, true);
        dev2 = alloc_dev_default(test, dev1, 0x301, true);
        dev3 = alloc_dev_with_dpin(test, dev2, 0x50301, true);
        alloc_dev_default(test, dev1, 0x501, true);
        dev5 = alloc_dev_default(test, dev1, 0x701, true);
        dev6 = alloc_dev_default(test, dev5, 0x70701, true);
        dev7 = alloc_dev_default(test, dev6, 0x3070701, true);
        alloc_dev_default(test, dev7, 0x303070701, true);
        dev9 = alloc_dev_default(test, dev7, 0x503070701, true);

        src_port = &dev3->ports[13];
        dst_port = &dev9->ports[14];

        /* 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);
}

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);
}

static void tb_test_path_not_connected(struct kunit *test)
{
        struct tb_switch *host, *dev1, *dev2;
        struct tb_port *down, *up;
        struct tb_path *path;

        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x3, false);
        /* Not connected to anything */
        dev2 = alloc_dev_default(test, NULL, 0x303, false);

        down = &dev1->ports[10];
        up = &dev2->ports[9];

        path = tb_path_alloc(NULL, down, 8, up, 8, 0, "PCIe Down");
        KUNIT_ASSERT_TRUE(test, path == NULL);
        path = tb_path_alloc(NULL, down, 8, up, 8, 1, "PCIe Down");
        KUNIT_ASSERT_TRUE(test, path == NULL);
}

struct hop_expectation {
        u64 route;
        u8 in_port;
        enum tb_port_type in_type;
        u8 out_port;
        enum tb_port_type out_type;
};

static void tb_test_path_not_bonded_lane0(struct kunit *test)
{
        /*
         * PCIe path from host to device using lane 0.
         *
         *   [Host]
         *   3 |: 4
         *   1 |: 2
         *  [Device]
         */
        static const struct hop_expectation test_data[] = {
                {
                        .route = 0x0,
                        .in_port = 9,
                        .in_type = TB_TYPE_PCIE_DOWN,
                        .out_port = 3,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x3,
                        .in_port = 1,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 9,
                        .out_type = TB_TYPE_PCIE_UP,
                },
        };
        struct tb_switch *host, *dev;
        struct tb_port *down, *up;
        struct tb_path *path;
        int i;

        host = alloc_host(test);
        dev = alloc_dev_default(test, host, 0x3, false);

        down = &host->ports[9];
        up = &dev->ports[9];

        path = tb_path_alloc(NULL, down, 8, up, 8, 0, "PCIe Down");
        KUNIT_ASSERT_TRUE(test, path != NULL);
        KUNIT_ASSERT_EQ(test, path->path_length, ARRAY_SIZE(test_data));
        for (i = 0; i < ARRAY_SIZE(test_data); i++) {
                const struct tb_port *in_port, *out_port;

                in_port = path->hops[i].in_port;
                out_port = path->hops[i].out_port;

                KUNIT_EXPECT_EQ(test, tb_route(in_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, in_port->port, test_data[i].in_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)in_port->config.type,
                                test_data[i].in_type);
                KUNIT_EXPECT_EQ(test, tb_route(out_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, out_port->port, test_data[i].out_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)out_port->config.type,
                                test_data[i].out_type);
        }
        tb_path_free(path);
}

static void tb_test_path_not_bonded_lane1(struct kunit *test)
{
        /*
         * DP Video path from host to device using lane 1. Paths like
         * these are only used with Thunderbolt 1 devices where lane
         * bonding is not possible. USB4 specifically does not allow
         * paths like this (you either use lane 0 where lane 1 is
         * disabled or both lanes are bonded).
         *
         *   [Host]
         *   1 :| 2
         *   1 :| 2
         *  [Device]
         */
        static const struct hop_expectation test_data[] = {
                {
                        .route = 0x0,
                        .in_port = 5,
                        .in_type = TB_TYPE_DP_HDMI_IN,
                        .out_port = 2,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x1,
                        .in_port = 2,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 13,
                        .out_type = TB_TYPE_DP_HDMI_OUT,
                },
        };
        struct tb_switch *host, *dev;
        struct tb_port *in, *out;
        struct tb_path *path;
        int i;

        host = alloc_host(test);
        dev = alloc_dev_default(test, host, 0x1, false);

        in = &host->ports[5];
        out = &dev->ports[13];

        path = tb_path_alloc(NULL, in, 9, out, 9, 1, "Video");
        KUNIT_ASSERT_TRUE(test, path != NULL);
        KUNIT_ASSERT_EQ(test, path->path_length, ARRAY_SIZE(test_data));
        for (i = 0; i < ARRAY_SIZE(test_data); i++) {
                const struct tb_port *in_port, *out_port;

                in_port = path->hops[i].in_port;
                out_port = path->hops[i].out_port;

                KUNIT_EXPECT_EQ(test, tb_route(in_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, in_port->port, test_data[i].in_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)in_port->config.type,
                                test_data[i].in_type);
                KUNIT_EXPECT_EQ(test, tb_route(out_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, out_port->port, test_data[i].out_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)out_port->config.type,
                                test_data[i].out_type);
        }
        tb_path_free(path);
}

static void tb_test_path_not_bonded_lane1_chain(struct kunit *test)
{
        /*
         * DP Video path from host to device 3 using lane 1.
         *
         *    [Host]
         *    1 :| 2
         *    1 :| 2
         *  [Device #1]
         *    7 :| 8
         *    1 :| 2
         *  [Device #2]
         *    5 :| 6
         *    1 :| 2
         *  [Device #3]
         */
        static const struct hop_expectation test_data[] = {
                {
                        .route = 0x0,
                        .in_port = 5,
                        .in_type = TB_TYPE_DP_HDMI_IN,
                        .out_port = 2,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x1,
                        .in_port = 2,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 8,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x701,
                        .in_port = 2,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 6,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x50701,
                        .in_port = 2,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 13,
                        .out_type = TB_TYPE_DP_HDMI_OUT,
                },
        };
        struct tb_switch *host, *dev1, *dev2, *dev3;
        struct tb_port *in, *out;
        struct tb_path *path;
        int i;

        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, false);
        dev2 = alloc_dev_default(test, dev1, 0x701, false);
        dev3 = alloc_dev_default(test, dev2, 0x50701, false);

        in = &host->ports[5];
        out = &dev3->ports[13];

        path = tb_path_alloc(NULL, in, 9, out, 9, 1, "Video");
        KUNIT_ASSERT_TRUE(test, path != NULL);
        KUNIT_ASSERT_EQ(test, path->path_length, ARRAY_SIZE(test_data));
        for (i = 0; i < ARRAY_SIZE(test_data); i++) {
                const struct tb_port *in_port, *out_port;

                in_port = path->hops[i].in_port;
                out_port = path->hops[i].out_port;

                KUNIT_EXPECT_EQ(test, tb_route(in_port->sw), test_data[i].route);

                KUNIT_EXPECT_EQ(test, in_port->port, test_data[i].in_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)in_port->config.type,
                                test_data[i].in_type);
                KUNIT_EXPECT_EQ(test, tb_route(out_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, out_port->port, test_data[i].out_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)out_port->config.type,
                                test_data[i].out_type);
        }
        tb_path_free(path);
}

static void tb_test_path_not_bonded_lane1_chain_reverse(struct kunit *test)
{
        /*
         * DP Video path from device 3 to host using lane 1.
         *
         *    [Host]
         *    1 :| 2
         *    1 :| 2
         *  [Device #1]
         *    7 :| 8
         *    1 :| 2
         *  [Device #2]
         *    5 :| 6
         *    1 :| 2
         *  [Device #3]
         */
        static const struct hop_expectation test_data[] = {
                {
                        .route = 0x50701,
                        .in_port = 13,
                        .in_type = TB_TYPE_DP_HDMI_IN,
                        .out_port = 2,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x701,
                        .in_port = 6,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 2,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x1,
                        .in_port = 8,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 2,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x0,
                        .in_port = 2,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 5,
                        .out_type = TB_TYPE_DP_HDMI_IN,
                },
        };
        struct tb_switch *host, *dev1, *dev2, *dev3;
        struct tb_port *in, *out;
        struct tb_path *path;
        int i;

        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, false);
        dev2 = alloc_dev_default(test, dev1, 0x701, false);
        dev3 = alloc_dev_with_dpin(test, dev2, 0x50701, false);

        in = &dev3->ports[13];
        out = &host->ports[5];

        path = tb_path_alloc(NULL, in, 9, out, 9, 1, "Video");
        KUNIT_ASSERT_TRUE(test, path != NULL);
        KUNIT_ASSERT_EQ(test, path->path_length, ARRAY_SIZE(test_data));
        for (i = 0; i < ARRAY_SIZE(test_data); i++) {
                const struct tb_port *in_port, *out_port;

                in_port = path->hops[i].in_port;
                out_port = path->hops[i].out_port;

                KUNIT_EXPECT_EQ(test, tb_route(in_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, in_port->port, test_data[i].in_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)in_port->config.type,
                                test_data[i].in_type);
                KUNIT_EXPECT_EQ(test, tb_route(out_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, out_port->port, test_data[i].out_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)out_port->config.type,
                                test_data[i].out_type);
        }
        tb_path_free(path);
}

static void tb_test_path_mixed_chain(struct kunit *test)
{
        /*
         * DP Video path from host to device 4 where first and last link
         * is bonded.
         *
         *    [Host]
         *    1 |
         *    1 |
         *  [Device #1]
         *    7 :| 8
         *    1 :| 2
         *  [Device #2]
         *    5 :| 6
         *    1 :| 2
         *  [Device #3]
         *    3 |
         *    1 |
         *  [Device #4]
         */
        static const struct hop_expectation test_data[] = {
                {
                        .route = 0x0,
                        .in_port = 5,
                        .in_type = TB_TYPE_DP_HDMI_IN,
                        .out_port = 1,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x1,
                        .in_port = 1,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 8,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x701,
                        .in_port = 2,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 6,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x50701,
                        .in_port = 2,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 3,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x3050701,
                        .in_port = 1,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 13,
                        .out_type = TB_TYPE_DP_HDMI_OUT,
                },
        };
        struct tb_switch *host, *dev1, *dev2, *dev3, *dev4;
        struct tb_port *in, *out;
        struct tb_path *path;
        int i;

        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, true);
        dev2 = alloc_dev_default(test, dev1, 0x701, false);
        dev3 = alloc_dev_default(test, dev2, 0x50701, false);
        dev4 = alloc_dev_default(test, dev3, 0x3050701, true);

        in = &host->ports[5];
        out = &dev4->ports[13];

        path = tb_path_alloc(NULL, in, 9, out, 9, 1, "Video");
        KUNIT_ASSERT_TRUE(test, path != NULL);
        KUNIT_ASSERT_EQ(test, path->path_length, ARRAY_SIZE(test_data));
        for (i = 0; i < ARRAY_SIZE(test_data); i++) {
                const struct tb_port *in_port, *out_port;

                in_port = path->hops[i].in_port;
                out_port = path->hops[i].out_port;

                KUNIT_EXPECT_EQ(test, tb_route(in_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, in_port->port, test_data[i].in_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)in_port->config.type,
                                test_data[i].in_type);
                KUNIT_EXPECT_EQ(test, tb_route(out_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, out_port->port, test_data[i].out_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)out_port->config.type,
                                test_data[i].out_type);
        }
        tb_path_free(path);
}

static void tb_test_path_mixed_chain_reverse(struct kunit *test)
{
        /*
         * DP Video path from device 4 to host where first and last link
         * is bonded.
         *
         *    [Host]
         *    1 |
         *    1 |
         *  [Device #1]
         *    7 :| 8
         *    1 :| 2
         *  [Device #2]
         *    5 :| 6
         *    1 :| 2
         *  [Device #3]
         *    3 |
         *    1 |
         *  [Device #4]
         */
        static const struct hop_expectation test_data[] = {
                {
                        .route = 0x3050701,
                        .in_port = 13,
                        .in_type = TB_TYPE_DP_HDMI_OUT,
                        .out_port = 1,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x50701,
                        .in_port = 3,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 2,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x701,
                        .in_port = 6,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 2,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x1,
                        .in_port = 8,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 1,
                        .out_type = TB_TYPE_PORT,
                },
                {
                        .route = 0x0,
                        .in_port = 1,
                        .in_type = TB_TYPE_PORT,
                        .out_port = 5,
                        .out_type = TB_TYPE_DP_HDMI_IN,
                },
        };
        struct tb_switch *host, *dev1, *dev2, *dev3, *dev4;
        struct tb_port *in, *out;
        struct tb_path *path;
        int i;

        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, true);
        dev2 = alloc_dev_default(test, dev1, 0x701, false);
        dev3 = alloc_dev_default(test, dev2, 0x50701, false);
        dev4 = alloc_dev_default(test, dev3, 0x3050701, true);

        in = &dev4->ports[13];
        out = &host->ports[5];

        path = tb_path_alloc(NULL, in, 9, out, 9, 1, "Video");
        KUNIT_ASSERT_TRUE(test, path != NULL);
        KUNIT_ASSERT_EQ(test, path->path_length, ARRAY_SIZE(test_data));
        for (i = 0; i < ARRAY_SIZE(test_data); i++) {
                const struct tb_port *in_port, *out_port;

                in_port = path->hops[i].in_port;
                out_port = path->hops[i].out_port;

                KUNIT_EXPECT_EQ(test, tb_route(in_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, in_port->port, test_data[i].in_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)in_port->config.type,
                                test_data[i].in_type);
                KUNIT_EXPECT_EQ(test, tb_route(out_port->sw), test_data[i].route);
                KUNIT_EXPECT_EQ(test, out_port->port, test_data[i].out_port);
                KUNIT_EXPECT_EQ(test, (enum tb_port_type)out_port->config.type,
                                test_data[i].out_type);
        }
        tb_path_free(path);
}

static void tb_test_tunnel_pcie(struct kunit *test)
{
        struct tb_switch *host, *dev1, *dev2;
        struct tb_tunnel *tunnel1, *tunnel2;
        struct tb_port *down, *up;

        /*
         * Create PCIe tunnel between host and two devices.
         *
         *   [Host]
         *    1 |
         *    1 |
         *  [Device #1]
         *    5 |
         *    1 |
         *  [Device #2]
         */
        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, true);
        dev2 = alloc_dev_default(test, dev1, 0x501, true);

        down = &host->ports[8];
        up = &dev1->ports[9];
        tunnel1 = tb_tunnel_alloc_pci(NULL, up, down);
        KUNIT_ASSERT_TRUE(test, tunnel1 != NULL);
        KUNIT_EXPECT_EQ(test, tunnel1->type, TB_TUNNEL_PCI);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->src_port, down);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->dst_port, up);
        KUNIT_ASSERT_EQ(test, tunnel1->npaths, 2);
        KUNIT_ASSERT_EQ(test, tunnel1->paths[0]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->paths[0]->hops[0].in_port, down);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->paths[0]->hops[1].out_port, up);
        KUNIT_ASSERT_EQ(test, tunnel1->paths[1]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->paths[1]->hops[0].in_port, up);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->paths[1]->hops[1].out_port, down);

        down = &dev1->ports[10];
        up = &dev2->ports[9];
        tunnel2 = tb_tunnel_alloc_pci(NULL, up, down);
        KUNIT_ASSERT_TRUE(test, tunnel2 != NULL);
        KUNIT_EXPECT_EQ(test, tunnel2->type, TB_TUNNEL_PCI);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->src_port, down);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->dst_port, up);
        KUNIT_ASSERT_EQ(test, tunnel2->npaths, 2);
        KUNIT_ASSERT_EQ(test, tunnel2->paths[0]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->paths[0]->hops[0].in_port, down);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->paths[0]->hops[1].out_port, up);
        KUNIT_ASSERT_EQ(test, tunnel2->paths[1]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->paths[1]->hops[0].in_port, up);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->paths[1]->hops[1].out_port, down);

        tb_tunnel_free(tunnel2);
        tb_tunnel_free(tunnel1);
}

static void tb_test_tunnel_dp(struct kunit *test)
{
        struct tb_switch *host, *dev;
        struct tb_port *in, *out;
        struct tb_tunnel *tunnel;

        /*
         * Create DP tunnel between Host and Device
         *
         *   [Host]
         *   1 |
         *   1 |
         *  [Device]
         */
        host = alloc_host(test);
        dev = alloc_dev_default(test, host, 0x3, true);

        in = &host->ports[5];
        out = &dev->ports[13];

        tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DP);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->dst_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, 3);
        KUNIT_ASSERT_EQ(test, tunnel->paths[0]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].in_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[1].out_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->paths[1]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[0].in_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[1].out_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->paths[2]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[2]->hops[0].in_port, out);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[2]->hops[1].out_port, in);
        tb_tunnel_free(tunnel);
}

static void tb_test_tunnel_dp_chain(struct kunit *test)
{
        struct tb_switch *host, *dev1, *dev4;
        struct tb_port *in, *out;
        struct tb_tunnel *tunnel;

        /*
         * Create DP tunnel from Host DP IN to Device #4 DP OUT.
         *
         *           [Host]
         *            1 |
         *            1 |
         *         [Device #1]
         *       3 /   | 5  \ 7
         *      1 /    |     \ 1
         * [Device #2] |    [Device #4]
         *             | 1
         *         [Device #3]
         */
        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, true);
        alloc_dev_default(test, dev1, 0x301, true);
        alloc_dev_default(test, dev1, 0x501, true);
        dev4 = alloc_dev_default(test, dev1, 0x701, true);

        in = &host->ports[5];
        out = &dev4->ports[14];

        tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DP);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->dst_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, 3);
        KUNIT_ASSERT_EQ(test, tunnel->paths[0]->path_length, 3);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].in_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[2].out_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->paths[1]->path_length, 3);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[0].in_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[2].out_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->paths[2]->path_length, 3);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[2]->hops[0].in_port, out);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[2]->hops[2].out_port, in);
        tb_tunnel_free(tunnel);
}

static void tb_test_tunnel_dp_tree(struct kunit *test)
{
        struct tb_switch *host, *dev1, *dev2, *dev3, *dev5;
        struct tb_port *in, *out;
        struct tb_tunnel *tunnel;

        /*
         * Create DP tunnel from Device #2 DP IN to Device #5 DP OUT.
         *
         *          [Host]
         *           3 |
         *           1 |
         *         [Device #1]
         *       3 /   | 5  \ 7
         *      1 /    |     \ 1
         * [Device #2] |    [Device #4]
         *             | 1
         *         [Device #3]
         *             | 5
         *             | 1
         *         [Device #5]
         */
        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x3, true);
        dev2 = alloc_dev_with_dpin(test, dev1, 0x303, true);
        dev3 = alloc_dev_default(test, dev1, 0x503, true);
        alloc_dev_default(test, dev1, 0x703, true);
        dev5 = alloc_dev_default(test, dev3, 0x50503, true);

        in = &dev2->ports[13];
        out = &dev5->ports[13];

        tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DP);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->dst_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, 3);
        KUNIT_ASSERT_EQ(test, tunnel->paths[0]->path_length, 4);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].in_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[3].out_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->paths[1]->path_length, 4);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[0].in_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[3].out_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->paths[2]->path_length, 4);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[2]->hops[0].in_port, out);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[2]->hops[3].out_port, in);
        tb_tunnel_free(tunnel);
}

static void tb_test_tunnel_dp_max_length(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 *in, *out;
        struct tb_tunnel *tunnel;

        /*
         * Creates DP tunnel from Device #6 to Device #12.
         *
         *          [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]
         */
        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);

        in = &dev6->ports[13];
        out = &dev12->ports[13];

        tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DP);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->dst_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, 3);
        KUNIT_ASSERT_EQ(test, tunnel->paths[0]->path_length, 13);
        /* First hop */
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].in_port, in);
        /* Middle */
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[6].in_port,
                            &host->ports[1]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[6].out_port,
                            &host->ports[3]);
        /* Last */
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[12].out_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->paths[1]->path_length, 13);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[0].in_port, in);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[6].in_port,
                            &host->ports[1]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[6].out_port,
                            &host->ports[3]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[12].out_port, out);
        KUNIT_ASSERT_EQ(test, tunnel->paths[2]->path_length, 13);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[2]->hops[0].in_port, out);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[2]->hops[6].in_port,
                            &host->ports[3]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[2]->hops[6].out_port,
                            &host->ports[1]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[2]->hops[12].out_port, in);
        tb_tunnel_free(tunnel);
}

static void tb_test_tunnel_usb3(struct kunit *test)
{
        struct tb_switch *host, *dev1, *dev2;
        struct tb_tunnel *tunnel1, *tunnel2;
        struct tb_port *down, *up;

        /*
         * Create USB3 tunnel between host and two devices.
         *
         *   [Host]
         *    1 |
         *    1 |
         *  [Device #1]
         *          \ 7
         *           \ 1
         *         [Device #2]
         */
        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, true);
        dev2 = alloc_dev_default(test, dev1, 0x701, true);

        down = &host->ports[12];
        up = &dev1->ports[16];
        tunnel1 = tb_tunnel_alloc_usb3(NULL, up, down, 0, 0);
        KUNIT_ASSERT_TRUE(test, tunnel1 != NULL);
        KUNIT_EXPECT_EQ(test, tunnel1->type, TB_TUNNEL_USB3);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->src_port, down);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->dst_port, up);
        KUNIT_ASSERT_EQ(test, tunnel1->npaths, 2);
        KUNIT_ASSERT_EQ(test, tunnel1->paths[0]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->paths[0]->hops[0].in_port, down);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->paths[0]->hops[1].out_port, up);
        KUNIT_ASSERT_EQ(test, tunnel1->paths[1]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->paths[1]->hops[0].in_port, up);
        KUNIT_EXPECT_PTR_EQ(test, tunnel1->paths[1]->hops[1].out_port, down);

        down = &dev1->ports[17];
        up = &dev2->ports[16];
        tunnel2 = tb_tunnel_alloc_usb3(NULL, up, down, 0, 0);
        KUNIT_ASSERT_TRUE(test, tunnel2 != NULL);
        KUNIT_EXPECT_EQ(test, tunnel2->type, TB_TUNNEL_USB3);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->src_port, down);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->dst_port, up);
        KUNIT_ASSERT_EQ(test, tunnel2->npaths, 2);
        KUNIT_ASSERT_EQ(test, tunnel2->paths[0]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->paths[0]->hops[0].in_port, down);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->paths[0]->hops[1].out_port, up);
        KUNIT_ASSERT_EQ(test, tunnel2->paths[1]->path_length, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->paths[1]->hops[0].in_port, up);
        KUNIT_EXPECT_PTR_EQ(test, tunnel2->paths[1]->hops[1].out_port, down);

        tb_tunnel_free(tunnel2);
        tb_tunnel_free(tunnel1);
}

static void tb_test_tunnel_port_on_path(struct kunit *test)
{
        struct tb_switch *host, *dev1, *dev2, *dev3, *dev4, *dev5;
        struct tb_port *in, *out, *port;
        struct tb_tunnel *dp_tunnel;

        /*
         *          [Host]
         *           3 |
         *           1 |
         *         [Device #1]
         *       3 /   | 5  \ 7
         *      1 /    |     \ 1
         * [Device #2] |    [Device #4]
         *             | 1
         *         [Device #3]
         *             | 5
         *             | 1
         *         [Device #5]
         */
        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x3, true);
        dev2 = alloc_dev_with_dpin(test, dev1, 0x303, true);
        dev3 = alloc_dev_default(test, dev1, 0x503, true);
        dev4 = alloc_dev_default(test, dev1, 0x703, true);
        dev5 = alloc_dev_default(test, dev3, 0x50503, true);

        in = &dev2->ports[13];
        out = &dev5->ports[13];

        dp_tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
        KUNIT_ASSERT_TRUE(test, dp_tunnel != NULL);

        KUNIT_EXPECT_TRUE(test, tb_tunnel_port_on_path(dp_tunnel, in));
        KUNIT_EXPECT_TRUE(test, tb_tunnel_port_on_path(dp_tunnel, out));

        port = &host->ports[8];
        KUNIT_EXPECT_FALSE(test, tb_tunnel_port_on_path(dp_tunnel, port));

        port = &host->ports[3];
        KUNIT_EXPECT_FALSE(test, tb_tunnel_port_on_path(dp_tunnel, port));

        port = &dev1->ports[1];
        KUNIT_EXPECT_FALSE(test, tb_tunnel_port_on_path(dp_tunnel, port));

        port = &dev1->ports[3];
        KUNIT_EXPECT_TRUE(test, tb_tunnel_port_on_path(dp_tunnel, port));

        port = &dev1->ports[5];
        KUNIT_EXPECT_TRUE(test, tb_tunnel_port_on_path(dp_tunnel, port));

        port = &dev1->ports[7];
        KUNIT_EXPECT_FALSE(test, tb_tunnel_port_on_path(dp_tunnel, port));

        port = &dev3->ports[1];
        KUNIT_EXPECT_TRUE(test, tb_tunnel_port_on_path(dp_tunnel, port));

        port = &dev5->ports[1];
        KUNIT_EXPECT_TRUE(test, tb_tunnel_port_on_path(dp_tunnel, port));

        port = &dev4->ports[1];
        KUNIT_EXPECT_FALSE(test, tb_tunnel_port_on_path(dp_tunnel, port));

        tb_tunnel_free(dp_tunnel);
}

static void tb_test_tunnel_dma(struct kunit *test)
{
        struct tb_port *nhi, *port;
        struct tb_tunnel *tunnel;
        struct tb_switch *host;

        /*
         * Create DMA tunnel from NHI to port 1 and back.
         *
         *   [Host 1]
         *    1 ^ In HopID 1 -> Out HopID 8
         *      |
         *      v In HopID 8 -> Out HopID 1
         * ............ Domain border
         *      |
         *   [Host 2]
         */
        host = alloc_host(test);
        nhi = &host->ports[7];
        port = &host->ports[1];

        tunnel = tb_tunnel_alloc_dma(NULL, nhi, port, 8, 1, 8, 1);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DMA);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, nhi);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->dst_port, port);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, 2);
        /* RX path */
        KUNIT_ASSERT_EQ(test, tunnel->paths[0]->path_length, 1);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].in_port, port);
        KUNIT_EXPECT_EQ(test, tunnel->paths[0]->hops[0].in_hop_index, 8);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].out_port, nhi);
        KUNIT_EXPECT_EQ(test, tunnel->paths[0]->hops[0].next_hop_index, 1);
        /* TX path */
        KUNIT_ASSERT_EQ(test, tunnel->paths[1]->path_length, 1);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[0].in_port, nhi);
        KUNIT_EXPECT_EQ(test, tunnel->paths[1]->hops[0].in_hop_index, 1);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[0].out_port, port);
        KUNIT_EXPECT_EQ(test, tunnel->paths[1]->hops[0].next_hop_index, 8);

        tb_tunnel_free(tunnel);
}

static void tb_test_tunnel_dma_rx(struct kunit *test)
{
        struct tb_port *nhi, *port;
        struct tb_tunnel *tunnel;
        struct tb_switch *host;

        /*
         * Create DMA RX tunnel from port 1 to NHI.
         *
         *   [Host 1]
         *    1 ^
         *      |
         *      | In HopID 15 -> Out HopID 2
         * ............ Domain border
         *      |
         *   [Host 2]
         */
        host = alloc_host(test);
        nhi = &host->ports[7];
        port = &host->ports[1];

        tunnel = tb_tunnel_alloc_dma(NULL, nhi, port, -1, -1, 15, 2);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DMA);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, nhi);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->dst_port, port);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, 1);
        /* RX path */
        KUNIT_ASSERT_EQ(test, tunnel->paths[0]->path_length, 1);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].in_port, port);
        KUNIT_EXPECT_EQ(test, tunnel->paths[0]->hops[0].in_hop_index, 15);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].out_port, nhi);
        KUNIT_EXPECT_EQ(test, tunnel->paths[0]->hops[0].next_hop_index, 2);

        tb_tunnel_free(tunnel);
}

static void tb_test_tunnel_dma_tx(struct kunit *test)
{
        struct tb_port *nhi, *port;
        struct tb_tunnel *tunnel;
        struct tb_switch *host;

        /*
         * Create DMA TX tunnel from NHI to port 1.
         *
         *   [Host 1]
         *    1 | In HopID 2 -> Out HopID 15
         *      |
         *      v
         * ............ Domain border
         *      |
         *   [Host 2]
         */
        host = alloc_host(test);
        nhi = &host->ports[7];
        port = &host->ports[1];

        tunnel = tb_tunnel_alloc_dma(NULL, nhi, port, 15, 2, -1, -1);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DMA);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, nhi);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->dst_port, port);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, 1);
        /* TX path */
        KUNIT_ASSERT_EQ(test, tunnel->paths[0]->path_length, 1);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].in_port, nhi);
        KUNIT_EXPECT_EQ(test, tunnel->paths[0]->hops[0].in_hop_index, 2);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].out_port, port);
        KUNIT_EXPECT_EQ(test, tunnel->paths[0]->hops[0].next_hop_index, 15);

        tb_tunnel_free(tunnel);
}

static void tb_test_tunnel_dma_chain(struct kunit *test)
{
        struct tb_switch *host, *dev1, *dev2;
        struct tb_port *nhi, *port;
        struct tb_tunnel *tunnel;

        /*
         * Create DMA tunnel from NHI to Device #2 port 3 and back.
         *
         *   [Host 1]
         *    1 ^ In HopID 1 -> Out HopID x
         *      |
         *    1 | In HopID x -> Out HopID 1
         *  [Device #1]
         *         7 \
         *          1 \
         *         [Device #2]
         *           3 | In HopID x -> Out HopID 8
         *             |
         *             v In HopID 8 -> Out HopID x
         * ............ Domain border
         *             |
         *          [Host 2]
         */
        host = alloc_host(test);
        dev1 = alloc_dev_default(test, host, 0x1, true);
        dev2 = alloc_dev_default(test, dev1, 0x701, true);

        nhi = &host->ports[7];
        port = &dev2->ports[3];
        tunnel = tb_tunnel_alloc_dma(NULL, nhi, port, 8, 1, 8, 1);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DMA);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, nhi);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->dst_port, port);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, 2);
        /* RX path */
        KUNIT_ASSERT_EQ(test, tunnel->paths[0]->path_length, 3);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].in_port, port);
        KUNIT_EXPECT_EQ(test, tunnel->paths[0]->hops[0].in_hop_index, 8);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[0].out_port,
                            &dev2->ports[1]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[1].in_port,
                            &dev1->ports[7]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[1].out_port,
                            &dev1->ports[1]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[2].in_port,
                            &host->ports[1]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[0]->hops[2].out_port, nhi);
        KUNIT_EXPECT_EQ(test, tunnel->paths[0]->hops[2].next_hop_index, 1);
        /* TX path */
        KUNIT_ASSERT_EQ(test, tunnel->paths[1]->path_length, 3);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[0].in_port, nhi);
        KUNIT_EXPECT_EQ(test, tunnel->paths[1]->hops[0].in_hop_index, 1);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[1].in_port,
                            &dev1->ports[1]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[1].out_port,
                            &dev1->ports[7]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[2].in_port,
                            &dev2->ports[1]);
        KUNIT_EXPECT_PTR_EQ(test, tunnel->paths[1]->hops[2].out_port, port);
        KUNIT_EXPECT_EQ(test, tunnel->paths[1]->hops[2].next_hop_index, 8);

        tb_tunnel_free(tunnel);
}

static void tb_test_tunnel_dma_match(struct kunit *test)
{
        struct tb_port *nhi, *port;
        struct tb_tunnel *tunnel;
        struct tb_switch *host;

        host = alloc_host(test);
        nhi = &host->ports[7];
        port = &host->ports[1];

        tunnel = tb_tunnel_alloc_dma(NULL, nhi, port, 15, 1, 15, 1);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);

        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, 15, 1, 15, 1));
        KUNIT_ASSERT_FALSE(test, tb_tunnel_match_dma(tunnel, 8, 1, 15, 1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, -1, 15, 1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, 15, 1, -1, -1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, 15, -1, -1, -1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, 1, -1, -1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, -1, 15, -1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, -1, -1, 1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, -1, -1, -1));
        KUNIT_ASSERT_FALSE(test, tb_tunnel_match_dma(tunnel, 8, -1, 8, -1));

        tb_tunnel_free(tunnel);

        tunnel = tb_tunnel_alloc_dma(NULL, nhi, port, 15, 1, -1, -1);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, 15, 1, -1, -1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, 15, -1, -1, -1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, 1, -1, -1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, -1, -1, -1));
        KUNIT_ASSERT_FALSE(test, tb_tunnel_match_dma(tunnel, 15, 1, 15, 1));
        KUNIT_ASSERT_FALSE(test, tb_tunnel_match_dma(tunnel, -1, -1, 15, 1));
        KUNIT_ASSERT_FALSE(test, tb_tunnel_match_dma(tunnel, 15, 11, -1, -1));

        tb_tunnel_free(tunnel);

        tunnel = tb_tunnel_alloc_dma(NULL, nhi, port, -1, -1, 15, 11);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, -1, 15, 11));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, -1, 15, -1));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, -1, -1, 11));
        KUNIT_ASSERT_TRUE(test, tb_tunnel_match_dma(tunnel, -1, -1, -1, -1));
        KUNIT_ASSERT_FALSE(test, tb_tunnel_match_dma(tunnel, -1, -1, 15, 1));
        KUNIT_ASSERT_FALSE(test, tb_tunnel_match_dma(tunnel, -1, -1, 10, 11));
        KUNIT_ASSERT_FALSE(test, tb_tunnel_match_dma(tunnel, 15, 11, -1, -1));

        tb_tunnel_free(tunnel);
}

static void tb_test_credit_alloc_legacy_not_bonded(struct kunit *test)
{
        struct tb_switch *host, *dev;
        struct tb_port *up, *down;
        struct tb_tunnel *tunnel;
        struct tb_path *path;

        host = alloc_host(test);
        dev = alloc_dev_default(test, host, 0x1, false);

        down = &host->ports[8];
        up = &dev->ports[9];
        tunnel = tb_tunnel_alloc_pci(NULL, up, down);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, (size_t)2);

        path = tunnel->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 16U);

        path = tunnel->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 16U);

        tb_tunnel_free(tunnel);
}

static void tb_test_credit_alloc_legacy_bonded(struct kunit *test)
{
        struct tb_switch *host, *dev;
        struct tb_port *up, *down;
        struct tb_tunnel *tunnel;
        struct tb_path *path;

        host = alloc_host(test);
        dev = alloc_dev_default(test, host, 0x1, true);

        down = &host->ports[8];
        up = &dev->ports[9];
        tunnel = tb_tunnel_alloc_pci(NULL, up, down);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, (size_t)2);

        path = tunnel->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 32U);

        path = tunnel->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 32U);

        tb_tunnel_free(tunnel);
}

static void tb_test_credit_alloc_pcie(struct kunit *test)
{
        struct tb_switch *host, *dev;
        struct tb_port *up, *down;
        struct tb_tunnel *tunnel;
        struct tb_path *path;

        host = alloc_host_usb4(test);
        dev = alloc_dev_usb4(test, host, 0x1, true);

        down = &host->ports[8];
        up = &dev->ports[9];
        tunnel = tb_tunnel_alloc_pci(NULL, up, down);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, (size_t)2);

        path = tunnel->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 32U);

        path = tunnel->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 64U);

        tb_tunnel_free(tunnel);
}

static void tb_test_credit_alloc_dp(struct kunit *test)
{

        struct tb_switch *host, *dev;
        struct tb_port *in, *out;
        struct tb_tunnel *tunnel;
        struct tb_path *path;

        host = alloc_host_usb4(test);
        dev = alloc_dev_usb4(test, host, 0x1, true);

        in = &host->ports[5];
        out = &dev->ports[14];

        tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, (size_t)3);

        /* Video (main) path */
        path = tunnel->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 12U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 18U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 0U);

        /* AUX TX */
        path = tunnel->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 1U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 1U);

        /* AUX RX */
        path = tunnel->paths[2];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 1U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 1U);

        tb_tunnel_free(tunnel);
}

static void tb_test_credit_alloc_usb3(struct kunit *test)
{
        struct tb_switch *host, *dev;
        struct tb_port *up, *down;
        struct tb_tunnel *tunnel;
        struct tb_path *path;

        host = alloc_host_usb4(test);
        dev = alloc_dev_usb4(test, host, 0x1, true);

        down = &host->ports[12];
        up = &dev->ports[16];
        tunnel = tb_tunnel_alloc_usb3(NULL, up, down, 0, 0);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, (size_t)2);

        path = tunnel->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 14U);

        path = tunnel->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 32U);

        tb_tunnel_free(tunnel);
}

static void tb_test_credit_alloc_dma(struct kunit *test)
{
        struct tb_switch *host, *dev;
        struct tb_port *nhi, *port;
        struct tb_tunnel *tunnel;
        struct tb_path *path;

        host = alloc_host_usb4(test);
        dev = alloc_dev_usb4(test, host, 0x1, true);

        nhi = &host->ports[7];
        port = &dev->ports[3];

        tunnel = tb_tunnel_alloc_dma(NULL, nhi, port, 8, 1, 8, 1);
        KUNIT_ASSERT_TRUE(test, tunnel != NULL);
        KUNIT_ASSERT_EQ(test, tunnel->npaths, (size_t)2);

        /* DMA RX */
        path = tunnel->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 14U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 14U);

        /* DMA TX */
        path = tunnel->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 14U);

        tb_tunnel_free(tunnel);
}

static void tb_test_credit_alloc_dma_multiple(struct kunit *test)
{
        struct tb_tunnel *tunnel1, *tunnel2, *tunnel3;
        struct tb_switch *host, *dev;
        struct tb_port *nhi, *port;
        struct tb_path *path;

        host = alloc_host_usb4(test);
        dev = alloc_dev_usb4(test, host, 0x1, true);

        nhi = &host->ports[7];
        port = &dev->ports[3];

        /*
         * Create three DMA tunnels through the same ports. With the
         * default buffers we should be able to create two and the last
         * one fails.
         *
         * For default host we have following buffers for DMA:
         *
         *   120 - (2 + 2 * (1 + 0) + 32 + 64 + spare) = 20
         *
         * For device we have following:
         *
         *  120 - (2 + 2 * (1 + 18) + 14 + 32 + spare) = 34
         *
         * spare = 14 + 1 = 15
         *
         * So on host the first tunnel gets 14 and the second gets the
         * remaining 1 and then we run out of buffers.
         */
        tunnel1 = tb_tunnel_alloc_dma(NULL, nhi, port, 8, 1, 8, 1);
        KUNIT_ASSERT_TRUE(test, tunnel1 != NULL);
        KUNIT_ASSERT_EQ(test, tunnel1->npaths, (size_t)2);

        path = tunnel1->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 14U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 14U);

        path = tunnel1->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 14U);

        tunnel2 = tb_tunnel_alloc_dma(NULL, nhi, port, 9, 2, 9, 2);
        KUNIT_ASSERT_TRUE(test, tunnel2 != NULL);
        KUNIT_ASSERT_EQ(test, tunnel2->npaths, (size_t)2);

        path = tunnel2->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 14U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 1U);

        path = tunnel2->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 1U);

        tunnel3 = tb_tunnel_alloc_dma(NULL, nhi, port, 10, 3, 10, 3);
        KUNIT_ASSERT_TRUE(test, tunnel3 == NULL);

        /*
         * Release the first DMA tunnel. That should make 14 buffers
         * available for the next tunnel.
         */
        tb_tunnel_free(tunnel1);

        tunnel3 = tb_tunnel_alloc_dma(NULL, nhi, port, 10, 3, 10, 3);
        KUNIT_ASSERT_TRUE(test, tunnel3 != NULL);

        path = tunnel3->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 14U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 14U);

        path = tunnel3->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 14U);

        tb_tunnel_free(tunnel3);
        tb_tunnel_free(tunnel2);
}

static struct tb_tunnel *TB_TEST_PCIE_TUNNEL(struct kunit *test,
                        struct tb_switch *host, struct tb_switch *dev)
{
        struct tb_port *up, *down;
        struct tb_tunnel *pcie_tunnel;
        struct tb_path *path;

        down = &host->ports[8];
        up = &dev->ports[9];
        pcie_tunnel = tb_tunnel_alloc_pci(NULL, up, down);
        KUNIT_ASSERT_TRUE(test, pcie_tunnel != NULL);
        KUNIT_ASSERT_EQ(test, pcie_tunnel->npaths, (size_t)2);

        path = pcie_tunnel->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 32U);

        path = pcie_tunnel->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 64U);

        return pcie_tunnel;
}

static struct tb_tunnel *TB_TEST_DP_TUNNEL1(struct kunit *test,
                        struct tb_switch *host, struct tb_switch *dev)
{
        struct tb_port *in, *out;
        struct tb_tunnel *dp_tunnel1;
        struct tb_path *path;

        in = &host->ports[5];
        out = &dev->ports[13];
        dp_tunnel1 = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
        KUNIT_ASSERT_TRUE(test, dp_tunnel1 != NULL);
        KUNIT_ASSERT_EQ(test, dp_tunnel1->npaths, (size_t)3);

        path = dp_tunnel1->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 12U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 18U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 0U);

        path = dp_tunnel1->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 1U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 1U);

        path = dp_tunnel1->paths[2];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 1U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 1U);

        return dp_tunnel1;
}

static struct tb_tunnel *TB_TEST_DP_TUNNEL2(struct kunit *test,
                        struct tb_switch *host, struct tb_switch *dev)
{
        struct tb_port *in, *out;
        struct tb_tunnel *dp_tunnel2;
        struct tb_path *path;

        in = &host->ports[6];
        out = &dev->ports[14];
        dp_tunnel2 = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
        KUNIT_ASSERT_TRUE(test, dp_tunnel2 != NULL);
        KUNIT_ASSERT_EQ(test, dp_tunnel2->npaths, (size_t)3);

        path = dp_tunnel2->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 12U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 18U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 0U);

        path = dp_tunnel2->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 1U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 1U);

        path = dp_tunnel2->paths[2];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 1U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 1U);

        return dp_tunnel2;
}

static struct tb_tunnel *TB_TEST_USB3_TUNNEL(struct kunit *test,
                        struct tb_switch *host, struct tb_switch *dev)
{
        struct tb_port *up, *down;
        struct tb_tunnel *usb3_tunnel;
        struct tb_path *path;

        down = &host->ports[12];
        up = &dev->ports[16];
        usb3_tunnel = tb_tunnel_alloc_usb3(NULL, up, down, 0, 0);
        KUNIT_ASSERT_TRUE(test, usb3_tunnel != NULL);
        KUNIT_ASSERT_EQ(test, usb3_tunnel->npaths, (size_t)2);

        path = usb3_tunnel->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 14U);

        path = usb3_tunnel->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 7U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 32U);

        return usb3_tunnel;
}

static struct tb_tunnel *TB_TEST_DMA_TUNNEL1(struct kunit *test,
                        struct tb_switch *host, struct tb_switch *dev)
{
        struct tb_port *nhi, *port;
        struct tb_tunnel *dma_tunnel1;
        struct tb_path *path;

        nhi = &host->ports[7];
        port = &dev->ports[3];
        dma_tunnel1 = tb_tunnel_alloc_dma(NULL, nhi, port, 8, 1, 8, 1);
        KUNIT_ASSERT_TRUE(test, dma_tunnel1 != NULL);
        KUNIT_ASSERT_EQ(test, dma_tunnel1->npaths, (size_t)2);

        path = dma_tunnel1->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 14U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 14U);

        path = dma_tunnel1->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 14U);

        return dma_tunnel1;
}

static struct tb_tunnel *TB_TEST_DMA_TUNNEL2(struct kunit *test,
                        struct tb_switch *host, struct tb_switch *dev)
{
        struct tb_port *nhi, *port;
        struct tb_tunnel *dma_tunnel2;
        struct tb_path *path;

        nhi = &host->ports[7];
        port = &dev->ports[3];
        dma_tunnel2 = tb_tunnel_alloc_dma(NULL, nhi, port, 9, 2, 9, 2);
        KUNIT_ASSERT_TRUE(test, dma_tunnel2 != NULL);
        KUNIT_ASSERT_EQ(test, dma_tunnel2->npaths, (size_t)2);

        path = dma_tunnel2->paths[0];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 14U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 1U);

        path = dma_tunnel2->paths[1];
        KUNIT_ASSERT_EQ(test, path->path_length, 2);
        KUNIT_EXPECT_EQ(test, path->hops[0].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[0].initial_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].nfc_credits, 0U);
        KUNIT_EXPECT_EQ(test, path->hops[1].initial_credits, 1U);

        return dma_tunnel2;
}

static void tb_test_credit_alloc_all(struct kunit *test)
{
        struct tb_tunnel *pcie_tunnel, *dp_tunnel1, *dp_tunnel2, *usb3_tunnel;
        struct tb_tunnel *dma_tunnel1, *dma_tunnel2;
        struct tb_switch *host, *dev;

        /*
         * Create PCIe, 2 x DP, USB 3.x and two DMA tunnels from host to
         * device. Expectation is that all these can be established with
         * the default credit allocation found in Intel hardware.
         */

        host = alloc_host_usb4(test);
        dev = alloc_dev_usb4(test, host, 0x1, true);

        pcie_tunnel = TB_TEST_PCIE_TUNNEL(test, host, dev);
        dp_tunnel1 = TB_TEST_DP_TUNNEL1(test, host, dev);
        dp_tunnel2 = TB_TEST_DP_TUNNEL2(test, host, dev);
        usb3_tunnel = TB_TEST_USB3_TUNNEL(test, host, dev);
        dma_tunnel1 = TB_TEST_DMA_TUNNEL1(test, host, dev);
        dma_tunnel2 = TB_TEST_DMA_TUNNEL2(test, host, dev);

        tb_tunnel_free(dma_tunnel2);
        tb_tunnel_free(dma_tunnel1);
        tb_tunnel_free(usb3_tunnel);
        tb_tunnel_free(dp_tunnel2);
        tb_tunnel_free(dp_tunnel1);
        tb_tunnel_free(pcie_tunnel);
}

static const u32 root_directory[] = {
        0x55584401,     /* "UXD" v1 */
        0x00000018,     /* Root directory length */
        0x76656e64,     /* "vend" */
        0x6f726964,     /* "orid" */
        0x76000001,     /* "v" R 1 */
        0x00000a27,     /* Immediate value, ! Vendor ID */
        0x76656e64,     /* "vend" */
        0x6f726964,     /* "orid" */
        0x74000003,     /* "t" R 3 */
        0x0000001a,     /* Text leaf offset, (“Apple Inc.”) */
        0x64657669,     /* "devi" */
        0x63656964,     /* "ceid" */
        0x76000001,     /* "v" R 1 */
        0x0000000a,     /* Immediate value, ! Device ID */
        0x64657669,     /* "devi" */
        0x63656964,     /* "ceid" */
        0x74000003,     /* "t" R 3 */
        0x0000001d,     /* Text leaf offset, (“Macintosh”) */
        0x64657669,     /* "devi" */
        0x63657276,     /* "cerv" */
        0x76000001,     /* "v" R 1 */
        0x80000100,     /* Immediate value, Device Revision */
        0x6e657477,     /* "netw" */
        0x6f726b00,     /* "ork" */
        0x44000014,     /* "D" R 20 */
        0x00000021,     /* Directory data offset, (Network Directory) */
        0x4170706c,     /* "Appl" */
        0x6520496e,     /* "e In" */
        0x632e0000,     /* "c." ! */
        0x4d616369,     /* "Maci" */
        0x6e746f73,     /* "ntos" */
        0x68000000,     /* "h" */
        0x00000000,     /* padding */
        0xca8961c6,     /* Directory UUID, Network Directory */
        0x9541ce1c,     /* Directory UUID, Network Directory */
        0x5949b8bd,     /* Directory UUID, Network Directory */
        0x4f5a5f2e,     /* Directory UUID, Network Directory */
        0x70727463,     /* "prtc" */
        0x69640000,     /* "id" */
        0x76000001,     /* "v" R 1 */
        0x00000001,     /* Immediate value, Network Protocol ID */
        0x70727463,     /* "prtc" */
        0x76657273,     /* "vers" */
        0x76000001,     /* "v" R 1 */
        0x00000001,     /* Immediate value, Network Protocol Version */
        0x70727463,     /* "prtc" */
        0x72657673,     /* "revs" */
        0x76000001,     /* "v" R 1 */
        0x00000001,     /* Immediate value, Network Protocol Revision */
        0x70727463,     /* "prtc" */
        0x73746e73,     /* "stns" */
        0x76000001,     /* "v" R 1 */
        0x00000000,     /* Immediate value, Network Protocol Settings */
};

static const uuid_t network_dir_uuid =
        UUID_INIT(0xc66189ca, 0x1cce, 0x4195,
                  0xbd, 0xb8, 0x49, 0x59, 0x2e, 0x5f, 0x5a, 0x4f);

static void tb_test_property_parse(struct kunit *test)
{
        struct tb_property_dir *dir, *network_dir;
        struct tb_property *p;

        dir = tb_property_parse_dir(root_directory, ARRAY_SIZE(root_directory));
        KUNIT_ASSERT_TRUE(test, dir != NULL);

        p = tb_property_find(dir, "foo", TB_PROPERTY_TYPE_TEXT);
        KUNIT_ASSERT_TRUE(test, !p);

        p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_TEXT);
        KUNIT_ASSERT_TRUE(test, p != NULL);
        KUNIT_EXPECT_STREQ(test, p->value.text, "Apple Inc.");

        p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_VALUE);
        KUNIT_ASSERT_TRUE(test, p != NULL);
        KUNIT_EXPECT_EQ(test, p->value.immediate, 0xa27);

        p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_TEXT);
        KUNIT_ASSERT_TRUE(test, p != NULL);
        KUNIT_EXPECT_STREQ(test, p->value.text, "Macintosh");

        p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_VALUE);
        KUNIT_ASSERT_TRUE(test, p != NULL);
        KUNIT_EXPECT_EQ(test, p->value.immediate, 0xa);

        p = tb_property_find(dir, "missing", TB_PROPERTY_TYPE_DIRECTORY);
        KUNIT_ASSERT_TRUE(test, !p);

        p = tb_property_find(dir, "network", TB_PROPERTY_TYPE_DIRECTORY);
        KUNIT_ASSERT_TRUE(test, p != NULL);

        network_dir = p->value.dir;
        KUNIT_EXPECT_TRUE(test, uuid_equal(network_dir->uuid, &network_dir_uuid));

        p = tb_property_find(network_dir, "prtcid", TB_PROPERTY_TYPE_VALUE);
        KUNIT_ASSERT_TRUE(test, p != NULL);
        KUNIT_EXPECT_EQ(test, p->value.immediate, 0x1);

        p = tb_property_find(network_dir, "prtcvers", TB_PROPERTY_TYPE_VALUE);
        KUNIT_ASSERT_TRUE(test, p != NULL);
        KUNIT_EXPECT_EQ(test, p->value.immediate, 0x1);

        p = tb_property_find(network_dir, "prtcrevs", TB_PROPERTY_TYPE_VALUE);
        KUNIT_ASSERT_TRUE(test, p != NULL);
        KUNIT_EXPECT_EQ(test, p->value.immediate, 0x1);

        p = tb_property_find(network_dir, "prtcstns", TB_PROPERTY_TYPE_VALUE);
        KUNIT_ASSERT_TRUE(test, p != NULL);
        KUNIT_EXPECT_EQ(test, p->value.immediate, 0x0);

        p = tb_property_find(network_dir, "deviceid", TB_PROPERTY_TYPE_VALUE);
        KUNIT_EXPECT_TRUE(test, !p);
        p = tb_property_find(network_dir, "deviceid", TB_PROPERTY_TYPE_TEXT);
        KUNIT_EXPECT_TRUE(test, !p);

        tb_property_free_dir(dir);
}

static void tb_test_property_format(struct kunit *test)
{
        struct tb_property_dir *dir;
        ssize_t block_len;
        u32 *block;
        int ret, i;

        dir = tb_property_parse_dir(root_directory, ARRAY_SIZE(root_directory));
        KUNIT_ASSERT_TRUE(test, dir != NULL);

        ret = tb_property_format_dir(dir, NULL, 0);
        KUNIT_ASSERT_EQ(test, ret, ARRAY_SIZE(root_directory));

        block_len = ret;

        block = kunit_kzalloc(test, block_len * sizeof(u32), GFP_KERNEL);
        KUNIT_ASSERT_TRUE(test, block != NULL);

        ret = tb_property_format_dir(dir, block, block_len);
        KUNIT_EXPECT_EQ(test, ret, 0);

        for (i = 0; i < ARRAY_SIZE(root_directory); i++)
                KUNIT_EXPECT_EQ(test, root_directory[i], block[i]);

        tb_property_free_dir(dir);
}

static void compare_dirs(struct kunit *test, struct tb_property_dir *d1,
                         struct tb_property_dir *d2)
{
        struct tb_property *p1, *p2, *tmp;
        int n1, n2, i;

        if (d1->uuid) {
                KUNIT_ASSERT_TRUE(test, d2->uuid != NULL);
                KUNIT_ASSERT_TRUE(test, uuid_equal(d1->uuid, d2->uuid));
        } else {
                KUNIT_ASSERT_TRUE(test, d2->uuid == NULL);
        }

        n1 = 0;
        tb_property_for_each(d1, tmp)
                n1++;
        KUNIT_ASSERT_NE(test, n1, 0);

        n2 = 0;
        tb_property_for_each(d2, tmp)
                n2++;
        KUNIT_ASSERT_NE(test, n2, 0);

        KUNIT_ASSERT_EQ(test, n1, n2);

        p1 = NULL;
        p2 = NULL;
        for (i = 0; i < n1; i++) {
                p1 = tb_property_get_next(d1, p1);
                KUNIT_ASSERT_TRUE(test, p1 != NULL);
                p2 = tb_property_get_next(d2, p2);
                KUNIT_ASSERT_TRUE(test, p2 != NULL);

                KUNIT_ASSERT_STREQ(test, &p1->key[0], &p2->key[0]);
                KUNIT_ASSERT_EQ(test, p1->type, p2->type);
                KUNIT_ASSERT_EQ(test, p1->length, p2->length);

                switch (p1->type) {
                case TB_PROPERTY_TYPE_DIRECTORY:
                        KUNIT_ASSERT_TRUE(test, p1->value.dir != NULL);
                        KUNIT_ASSERT_TRUE(test, p2->value.dir != NULL);
                        compare_dirs(test, p1->value.dir, p2->value.dir);
                        break;

                case TB_PROPERTY_TYPE_DATA:
                        KUNIT_ASSERT_TRUE(test, p1->value.data != NULL);
                        KUNIT_ASSERT_TRUE(test, p2->value.data != NULL);
                        KUNIT_ASSERT_TRUE(test,
                                !memcmp(p1->value.data, p2->value.data,
                                        p1->length * 4)
                        );
                        break;

                case TB_PROPERTY_TYPE_TEXT:
                        KUNIT_ASSERT_TRUE(test, p1->value.text != NULL);
                        KUNIT_ASSERT_TRUE(test, p2->value.text != NULL);
                        KUNIT_ASSERT_STREQ(test, p1->value.text, p2->value.text);
                        break;

                case TB_PROPERTY_TYPE_VALUE:
                        KUNIT_ASSERT_EQ(test, p1->value.immediate,
                                        p2->value.immediate);
                        break;
                default:
                        KUNIT_FAIL(test, "unexpected property type");
                        break;
                }
        }
}

static void tb_test_property_copy(struct kunit *test)
{
        struct tb_property_dir *src, *dst;
        u32 *block;
        int ret, i;

        src = tb_property_parse_dir(root_directory, ARRAY_SIZE(root_directory));
        KUNIT_ASSERT_TRUE(test, src != NULL);

        dst = tb_property_copy_dir(src);
        KUNIT_ASSERT_TRUE(test, dst != NULL);

        /* Compare the structures */
        compare_dirs(test, src, dst);

        /* Compare the resulting property block */
        ret = tb_property_format_dir(dst, NULL, 0);
        KUNIT_ASSERT_EQ(test, ret, ARRAY_SIZE(root_directory));

        block = kunit_kzalloc(test, sizeof(root_directory), GFP_KERNEL);
        KUNIT_ASSERT_TRUE(test, block != NULL);

        ret = tb_property_format_dir(dst, block, ARRAY_SIZE(root_directory));
        KUNIT_EXPECT_TRUE(test, !ret);

        for (i = 0; i < ARRAY_SIZE(root_directory); i++)
                KUNIT_EXPECT_EQ(test, root_directory[i], block[i]);

        tb_property_free_dir(dst);
        tb_property_free_dir(src);
}

static struct kunit_case tb_test_cases[] = {
        KUNIT_CASE(tb_test_path_basic),
        KUNIT_CASE(tb_test_path_not_connected_walk),
        KUNIT_CASE(tb_test_path_single_hop_walk),
        KUNIT_CASE(tb_test_path_daisy_chain_walk),
        KUNIT_CASE(tb_test_path_simple_tree_walk),
        KUNIT_CASE(tb_test_path_complex_tree_walk),
        KUNIT_CASE(tb_test_path_max_length_walk),
        KUNIT_CASE(tb_test_path_not_connected),
        KUNIT_CASE(tb_test_path_not_bonded_lane0),
        KUNIT_CASE(tb_test_path_not_bonded_lane1),
        KUNIT_CASE(tb_test_path_not_bonded_lane1_chain),
        KUNIT_CASE(tb_test_path_not_bonded_lane1_chain_reverse),
        KUNIT_CASE(tb_test_path_mixed_chain),
        KUNIT_CASE(tb_test_path_mixed_chain_reverse),
        KUNIT_CASE(tb_test_tunnel_pcie),
        KUNIT_CASE(tb_test_tunnel_dp),
        KUNIT_CASE(tb_test_tunnel_dp_chain),
        KUNIT_CASE(tb_test_tunnel_dp_tree),
        KUNIT_CASE(tb_test_tunnel_dp_max_length),
        KUNIT_CASE(tb_test_tunnel_port_on_path),
        KUNIT_CASE(tb_test_tunnel_usb3),
        KUNIT_CASE(tb_test_tunnel_dma),
        KUNIT_CASE(tb_test_tunnel_dma_rx),
        KUNIT_CASE(tb_test_tunnel_dma_tx),
        KUNIT_CASE(tb_test_tunnel_dma_chain),
        KUNIT_CASE(tb_test_tunnel_dma_match),
        KUNIT_CASE(tb_test_credit_alloc_legacy_not_bonded),
        KUNIT_CASE(tb_test_credit_alloc_legacy_bonded),
        KUNIT_CASE(tb_test_credit_alloc_pcie),
        KUNIT_CASE(tb_test_credit_alloc_dp),
        KUNIT_CASE(tb_test_credit_alloc_usb3),
        KUNIT_CASE(tb_test_credit_alloc_dma),
        KUNIT_CASE(tb_test_credit_alloc_dma_multiple),
        KUNIT_CASE(tb_test_credit_alloc_all),
        KUNIT_CASE(tb_test_property_parse),
        KUNIT_CASE(tb_test_property_format),
        KUNIT_CASE(tb_test_property_copy),
        { }
};

static struct kunit_suite tb_test_suite = {
        .name = "thunderbolt",
        .test_cases = tb_test_cases,
};

static struct kunit_suite *tb_test_suites[] = { &tb_test_suite, NULL };

int tb_test_init(void)
{
        return __kunit_test_suites_init(tb_test_suites);
}

void tb_test_exit(void)
{
        return __kunit_test_suites_exit(tb_test_suites);
}