#
# Copyright (c) 2021 Nutanix Inc. All rights reserved.
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# Authors: Swapnil Ingle <swapnil.ingle@nutanix.com>
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import ctypes
import errno
from libvfio_user import *
import tempfile

ctx = None


def test_dma_sg_size():
    size = dma_sg_size()
    assert size == len(dma_sg_t())


def test_sgl_get_with_invalid_region():
    global ctx

    ctx = prepare_ctx_for_dma()
    assert ctx is not None

    sg = dma_sg_t()
    iovec = iovec_t()
    ret = vfu_sgl_get(ctx, sg, iovec)
    assert ret == -1
    assert ctypes.get_errno() == errno.EINVAL


def test_sgl_get_without_fd():
    client = connect_client(ctx)

    payload = vfio_user_dma_map(argsz=len(vfio_user_dma_map()),
        flags=(VFIO_USER_F_DMA_REGION_READ |
               VFIO_USER_F_DMA_REGION_WRITE),
        offset=0, addr=0x1000, size=4096)
    msg(ctx, client.sock, VFIO_USER_DMA_MAP, payload)
    sg = dma_sg_t()
    iovec = iovec_t()
    sg.region = 0
    ret = vfu_sgl_get(ctx, sg, iovec)
    assert ret == -1
    assert ctypes.get_errno() == errno.EFAULT

    client.disconnect(ctx)


def test_get_multiple_sge():
    client = connect_client(ctx)
    regions = 4
    f = tempfile.TemporaryFile()
    f.truncate(0x1000 * regions)
    for i in range(1, regions):
        payload = vfio_user_dma_map(argsz=len(vfio_user_dma_map()),
            flags=(VFIO_USER_F_DMA_REGION_READ |
                   VFIO_USER_F_DMA_REGION_WRITE),
            offset=0, addr=0x1000 * i, size=4096)
        msg(ctx, client.sock, VFIO_USER_DMA_MAP, payload, fds=[f.fileno()])

    ret, sg = vfu_addr_to_sgl(ctx, dma_addr=0x1000, length=4096 * 3,
                              max_nr_sgs=3, prot=mmap.PROT_READ)
    assert ret == 3

    iovec = (iovec_t * 3)()
    ret = vfu_sgl_get(ctx, sg, iovec, cnt=3)
    assert ret == 0
    assert iovec[0].iov_len == 4096
    assert iovec[1].iov_len == 4096
    assert iovec[2].iov_len == 4096

    client.disconnect(ctx)


def test_sgl_put():
    client = connect_client(ctx)
    regions = 4
    f = tempfile.TemporaryFile()
    f.truncate(0x1000 * regions)
    for i in range(1, regions):
        payload = vfio_user_dma_map(argsz=len(vfio_user_dma_map()),
            flags=(VFIO_USER_F_DMA_REGION_READ |
                   VFIO_USER_F_DMA_REGION_WRITE),
            offset=0, addr=0x1000 * i, size=4096)
        msg(ctx, client.sock, VFIO_USER_DMA_MAP, payload, fds=[f.fileno()])

    ret, sg = vfu_addr_to_sgl(ctx, dma_addr=0x1000, length=4096 * 3,
                              max_nr_sgs=3, prot=mmap.PROT_READ)
    assert ret == 3

    iovec = (iovec_t * 3)()
    ret = vfu_sgl_get(ctx, sg, iovec, cnt=3)
    assert ret == 0
    vfu_sgl_put(ctx, sg, iovec, cnt=3)

    client.disconnect(ctx)


def test_sgl_get_put_cleanup():
    vfu_destroy_ctx(ctx)

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