#
# Copyright (c) 2021 Nutanix Inc. All rights reserved.
#
# Authors: John Levon <john.levon@nutanix.com>
#
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from libvfio_user import *
import errno


def test_device_get_info():
    global ctx

    ctx = vfu_create_ctx(flags=LIBVFIO_USER_FLAG_ATTACH_NB)
    assert ctx is not None

    ret = vfu_setup_region(ctx, index=VFU_PCI_DEV_BAR0_REGION_IDX, size=4096,
                           flags=VFU_REGION_FLAG_RW)
    assert ret == 0
    ret = vfu_setup_region(ctx, index=VFU_PCI_DEV_BAR1_REGION_IDX, size=4096,
                           flags=(VFU_REGION_FLAG_RW | VFU_REGION_FLAG_MEM))
    assert ret == 0

    ret = vfu_realize_ctx(ctx)
    assert ret == 0

    # test short write

    client = connect_client(ctx)

    payload = struct.pack("II", 0, 0)

    msg(ctx, client.sock, VFIO_USER_DEVICE_GET_INFO, payload,
        expect=errno.EINVAL)

    # bad argsz

    payload = vfio_user_device_info(argsz=8, flags=0,
                                    num_regions=0, num_irqs=0)

    msg(ctx, client.sock, VFIO_USER_DEVICE_GET_INFO, payload,
        expect=errno.EINVAL)

    # valid with larger argsz

    payload = vfio_user_device_info(argsz=32, flags=0,
                                    num_regions=0, num_irqs=0)

    result = msg(ctx, client.sock, VFIO_USER_DEVICE_GET_INFO, payload)

    (argsz, flags, num_regions, num_irqs) = struct.unpack("IIII", result)

    assert argsz == 16
    assert flags == VFIO_DEVICE_FLAGS_PCI | VFIO_DEVICE_FLAGS_RESET
    assert num_regions == VFU_PCI_DEV_NUM_REGIONS
    assert num_irqs == VFU_DEV_NUM_IRQS

    client.disconnect(ctx)

    vfu_destroy_ctx(ctx)

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