numam-spdk/scripts/rpc/bdev.py

from .helpers import deprecated_alias


@deprecated_alias('set_bdev_options')
def bdev_set_options(client, bdev_io_pool_size=None, bdev_io_cache_size=None):
    """Set parameters for the bdev subsystem.

    Args:
        bdev_io_pool_size: number of bdev_io structures in shared buffer pool (optional)
        bdev_io_cache_size: maximum number of bdev_io structures cached per thread (optional)
    """
    params = {}

    if bdev_io_pool_size:
        params['bdev_io_pool_size'] = bdev_io_pool_size
    if bdev_io_cache_size:
        params['bdev_io_cache_size'] = bdev_io_cache_size

    return client.call('bdev_set_options', params)


@deprecated_alias('construct_compress_bdev')
def bdev_compress_create(client, base_bdev_name, pm_path):
    """Construct a compress virtual block device.

    Args:
        base_bdev_name: name of the underlying base bdev
        pm_path: path to persistent memory

    Returns:
        Name of created virtual block device.
    """
    params = {'base_bdev_name': base_bdev_name, 'pm_path': pm_path}

    return client.call('bdev_compress_create', params)


@deprecated_alias('delete_compress_bdev')
def bdev_compress_delete(client, name):
    """Delete compress virtual block device.

    Args:
        name: name of compress vbdev to delete
    """
    params = {'name': name}
    return client.call('bdev_compress_delete', params)


def set_compress_pmd(client, pmd):
    """Set pmd options for the bdev compress.

    Args:
        pmd: 0 = auto-select, 1 = QAT, 2 = ISAL
    """
    params = {'pmd': pmd}

    return client.call('set_compress_pmd', params)


def bdev_compress_get_orphans(client, name=None):
    """Get a list of comp bdevs that do not have a pmem file (aka orphaned).

    Args:
        name: comp bdev name to query (optional; if omitted, query all comp bdevs)

    Returns:
        List of comp bdev names.
    """
    params = {}
    if name:
        params['name'] = name
    return client.call('bdev_compress_get_orphans', params)


@deprecated_alias('construct_crypto_bdev')
def bdev_crypto_create(client, base_bdev_name, name, crypto_pmd, key):
    """Construct a crypto virtual block device.

    Args:
        base_bdev_name: name of the underlying base bdev
        name: name for the crypto vbdev
        crypto_pmd: name of of the DPDK crypto driver to use
        key: key

    Returns:
        Name of created virtual block device.
    """
    params = {'base_bdev_name': base_bdev_name, 'name': name, 'crypto_pmd': crypto_pmd, 'key': key}

    return client.call('bdev_crypto_create', params)


@deprecated_alias('delete_crypto_bdev')
def bdev_crypto_delete(client, name):
    """Delete crypto virtual block device.

    Args:
        name: name of crypto vbdev to delete
    """
    params = {'name': name}
    return client.call('bdev_crypto_delete', params)


@deprecated_alias('construct_ocf_bdev')
def bdev_ocf_create(client, name, mode, cache_bdev_name, core_bdev_name):
    """Add an OCF block device

    Args:
        name: name of constructed OCF bdev
        mode: OCF cache mode: {'wb', 'wt', 'pt', 'wa', 'wi', 'wo'}
        cache_bdev_name: name of underlying cache bdev
        core_bdev_name: name of underlying core bdev

    Returns:
        Name of created block device
    """
    params = {'name': name, 'mode': mode, 'cache_bdev_name': cache_bdev_name, 'core_bdev_name': core_bdev_name}

    return client.call('bdev_ocf_create', params)


@deprecated_alias('delete_ocf_bdev')
def bdev_ocf_delete(client, name):
    """Delete an OCF device

    Args:
        name: name of OCF bdev

    """
    params = {'name': name}

    return client.call('bdev_ocf_delete', params)


@deprecated_alias('get_ocf_stats')
def bdev_ocf_get_stats(client, name):
    """Get statistics of chosen OCF block device

    Args:
        name: name of OCF bdev

    Returns:
        Statistics as json object
    """
    params = {'name': name}

    return client.call('bdev_ocf_get_stats', params)


@deprecated_alias('get_ocf_stats')
def bdev_ocf_get_bdevs(client, name=None):
    """Get list of OCF devices including unregistered ones

    Args:
        name: name of OCF vbdev or name of cache device or name of core device (optional)

    Returns:
        Array of OCF devices with their current status
    """
    params = None
    if name:
        params = {'name': name}
    return client.call('bdev_ocf_get_bdevs', params)


@deprecated_alias('construct_malloc_bdev')
def bdev_malloc_create(client, num_blocks, block_size, name=None, uuid=None):
    """Construct a malloc block device.

    Args:
        num_blocks: size of block device in blocks
        block_size: block size of device; must be a power of 2 and at least 512
        name: name of block device (optional)
        uuid: UUID of block device (optional)

    Returns:
        Name of created block device.
    """
    params = {'num_blocks': num_blocks, 'block_size': block_size}
    if name:
        params['name'] = name
    if uuid:
        params['uuid'] = uuid
    return client.call('bdev_malloc_create', params)


@deprecated_alias('delete_malloc_bdev')
def bdev_malloc_delete(client, name):
    """Delete malloc block device.

    Args:
        bdev_name: name of malloc bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_malloc_delete', params)


@deprecated_alias('construct_null_bdev')
def bdev_null_create(client, num_blocks, block_size, name, uuid=None, md_size=None,
                     dif_type=None, dif_is_head_of_md=None):
    """Construct a null block device.

    Args:
        num_blocks: size of block device in blocks
        block_size: block size of device; data part size must be a power of 2 and at least 512
        name: name of block device
        uuid: UUID of block device (optional)
        md_size: metadata size of device (optional)
        dif_type: protection information type (optional)
        dif_is_head_of_md: protection information is in the first 8 bytes of metadata (optional)

    Returns:
        Name of created block device.
    """
    params = {'name': name, 'num_blocks': num_blocks,
              'block_size': block_size}
    if uuid:
        params['uuid'] = uuid
    if md_size:
        params['md_size'] = md_size
    if dif_type:
        params['dif_type'] = dif_type
    if dif_is_head_of_md:
        params['dif_is_head_of_md'] = dif_is_head_of_md
    return client.call('bdev_null_create', params)


@deprecated_alias('delete_null_bdev')
def bdev_null_delete(client, name):
    """Remove null bdev from the system.

    Args:
        name: name of null bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_null_delete', params)


@deprecated_alias('get_raid_bdevs')
def bdev_raid_get_bdevs(client, category):
    """Get list of raid bdevs based on category

    Args:
        category: any one of all or online or configuring or offline

    Returns:
        List of raid bdev names
    """
    params = {'category': category}
    return client.call('bdev_raid_get_bdevs', params)


@deprecated_alias('construct_raid_bdev')
def bdev_raid_create(client, name, raid_level, base_bdevs, strip_size=None, strip_size_kb=None):
    """Create raid bdev. Either strip size arg will work but one is required.

    Args:
        name: user defined raid bdev name
        strip_size (deprecated): strip size of raid bdev in KB, supported values like 8, 16, 32, 64, 128, 256, etc
        strip_size_kb: strip size of raid bdev in KB, supported values like 8, 16, 32, 64, 128, 256, etc
        raid_level: raid level of raid bdev, supported values 0
        base_bdevs: Space separated names of Nvme bdevs in double quotes, like "Nvme0n1 Nvme1n1 Nvme2n1"

    Returns:
        None
    """
    params = {'name': name, 'raid_level': raid_level, 'base_bdevs': base_bdevs}

    if strip_size:
        params['strip_size'] = strip_size

    if strip_size_kb:
        params['strip_size_kb'] = strip_size_kb

    return client.call('bdev_raid_create', params)


@deprecated_alias('destroy_raid_bdev')
def bdev_raid_delete(client, name):
    """Delete raid bdev

    Args:
        name: raid bdev name

    Returns:
        None
    """
    params = {'name': name}
    return client.call('bdev_raid_delete', params)


@deprecated_alias('construct_aio_bdev')
def bdev_aio_create(client, filename, name, block_size=None):
    """Construct a Linux AIO block device.

    Args:
        filename: path to device or file (ex: /dev/sda)
        name: name of block device
        block_size: block size of device (optional; autodetected if omitted)

    Returns:
        Name of created block device.
    """
    params = {'name': name,
              'filename': filename}

    if block_size:
        params['block_size'] = block_size

    return client.call('bdev_aio_create', params)


@deprecated_alias('delete_aio_bdev')
def bdev_aio_delete(client, name):
    """Remove aio bdev from the system.

    Args:
        bdev_name: name of aio bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_aio_delete', params)


def bdev_uring_create(client, filename, name, block_size=None):
    """Create a bdev with Linux io_uring backend.

    Args:
        filename: path to device or file (ex: /dev/nvme0n1)
        name: name of bdev
        block_size: block size of device (optional; autodetected if omitted)

    Returns:
        Name of created bdev.
    """
    params = {'name': name,
              'filename': filename}

    if block_size:
        params['block_size'] = block_size

    return client.call('bdev_uring_create', params)


def bdev_uring_delete(client, name):
    """Delete a uring bdev.

    Args:
        name: name of uring bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_uring_delete', params)


@deprecated_alias('set_bdev_nvme_options')
def bdev_nvme_set_options(client, action_on_timeout=None, timeout_us=None, retry_count=None,
                          arbitration_burst=None, low_priority_weight=None,
                          medium_priority_weight=None, high_priority_weight=None,
                          nvme_adminq_poll_period_us=None, nvme_ioq_poll_period_us=None, io_queue_requests=None,
                          delay_cmd_submit=None):
    """Set options for the bdev nvme. This is startup command.

    Args:
        action_on_timeout:  action to take on command time out. Valid values are: none, reset, abort (optional)
        timeout_us: Timeout for each command, in microseconds. If 0, don't track timeouts (optional)
        retry_count: The number of attempts per I/O when an I/O fails (optional)
        arbitration_burst: The value is expressed as a power of two (optional)
        low_prioity_weight: The number of commands that may be executed from the low priority queue at one time (optional)
        medium_prioity_weight: The number of commands that may be executed from the medium priority queue at one time (optional)
        high_prioity_weight: The number of commands that may be executed from the high priority queue at one time (optional)
        nvme_adminq_poll_period_us: How often the admin queue is polled for asynchronous events in microseconds (optional)
        nvme_ioq_poll_period_us: How often to poll I/O queues for completions in microseconds (optional)
        io_queue_requests: The number of requests allocated for each NVMe I/O queue. Default: 512 (optional)
        delay_cmd_submit: Enable delayed NVMe command submission to allow batching of multiple commands (optional)
    """
    params = {}

    if action_on_timeout:
        params['action_on_timeout'] = action_on_timeout

    if timeout_us:
        params['timeout_us'] = timeout_us

    if retry_count:
        params['retry_count'] = retry_count

    if arbitration_burst:
        params['arbitration_burst'] = arbitration_burst

    if low_priority_weight:
        params['low_priority_weight'] = low_priority_weight

    if medium_priority_weight:
        params['medium_priority_weight'] = medium_priority_weight

    if high_priority_weight:
        params['high_priority_weight'] = high_priority_weight

    if nvme_adminq_poll_period_us:
        params['nvme_adminq_poll_period_us'] = nvme_adminq_poll_period_us

    if nvme_ioq_poll_period_us:
        params['nvme_ioq_poll_period_us'] = nvme_ioq_poll_period_us

    if io_queue_requests:
        params['io_queue_requests'] = io_queue_requests

    if delay_cmd_submit is not None:
        params['delay_cmd_submit'] = delay_cmd_submit

    return client.call('bdev_nvme_set_options', params)


@deprecated_alias('set_bdev_nvme_hotplug')
def bdev_nvme_set_hotplug(client, enable, period_us=None):
    """Set options for the bdev nvme. This is startup command.

    Args:
       enable: True to enable hotplug, False to disable.
       period_us: how often the hotplug is processed for insert and remove events. Set 0 to reset to default. (optional)
    """
    params = {'enable': enable}

    if period_us:
        params['period_us'] = period_us

    return client.call('bdev_nvme_set_hotplug', params)


@deprecated_alias('construct_nvme_bdev')
def bdev_nvme_attach_controller(client, name, trtype, traddr, adrfam=None, trsvcid=None,
                                subnqn=None, hostnqn=None, hostaddr=None, hostsvcid=None,
                                prchk_reftag=None, prchk_guard=None):
    """Construct block device for each NVMe namespace in the attached controller.

    Args:
        name: bdev name prefix; "n" + namespace ID will be appended to create unique names
        trtype: transport type ("PCIe", "RDMA")
        traddr: transport address (PCI BDF or IP address)
        adrfam: address family ("IPv4", "IPv6", "IB", or "FC") (optional for PCIe)
        trsvcid: transport service ID (port number for IP-based addresses; optional for PCIe)
        subnqn: subsystem NQN to connect to (optional)
        hostnqn: NQN to connect from (optional)
        hostaddr: host transport address (IP address for IP-based transports, NULL for PCIe or FC; optional)
        hostsvcid: host transport service ID (port number for IP-based transports, NULL for PCIe or FC; optional)
        prchk_reftag: Enable checking of PI reference tag for I/O processing (optional)
        prchk_guard: Enable checking of PI guard for I/O processing (optional)

    Returns:
        Names of created block devices.
    """
    params = {'name': name,
              'trtype': trtype,
              'traddr': traddr}

    if hostnqn:
        params['hostnqn'] = hostnqn

    if hostaddr:
        params['hostaddr'] = hostaddr

    if hostsvcid:
        params['hostsvcid'] = hostsvcid

    if adrfam:
        params['adrfam'] = adrfam

    if trsvcid:
        params['trsvcid'] = trsvcid

    if subnqn:
        params['subnqn'] = subnqn

    if prchk_reftag:
        params['prchk_reftag'] = prchk_reftag

    if prchk_guard:
        params['prchk_guard'] = prchk_guard

    return client.call('bdev_nvme_attach_controller', params)


@deprecated_alias('delete_nvme_controller')
def bdev_nvme_detach_controller(client, name):
    """Detach NVMe controller and delete any associated bdevs.

    Args:
        name: controller name
    """

    params = {'name': name}
    return client.call('bdev_nvme_detach_controller', params)


def bdev_nvme_cuse_register(client, name):
    """Register CUSE devices on NVMe controller.

    Args:
        name: Name of the operating NVMe controller
    """
    params = {'name': name}

    return client.call('bdev_nvme_cuse_register', params)


def bdev_nvme_cuse_unregister(client, name):
    """Unregister CUSE devices on NVMe controller.

    Args:
        name: Name of the operating NVMe controller
    """
    params = {'name': name}

    return client.call('bdev_nvme_cuse_unregister', params)


def bdev_zone_block_create(client, name, base_bdev, zone_capacity, optimal_open_zones):
    """Creates a virtual zone device on top of existing non-zoned bdev.

    Args:
        name: Zone device name
        base_bdev: Base Nvme bdev name
        zone_capacity: Surfaced zone capacity in blocks
        optimal_open_zones: Number of zones required to reach optimal write speed (optional, default: 1)

    Returns:
        Name of created block device.
    """
    params = {'name': name,
              'base_bdev': base_bdev,
              'zone_capacity': zone_capacity,
              'optimal_open_zones': optimal_open_zones}

    return client.call('bdev_zone_block_create', params)


def bdev_zone_block_delete(client, name):
    """Remove block zone bdev from the system.

    Args:
        name: name of block zone bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_zone_block_delete', params)


@deprecated_alias('construct_rbd_bdev')
def bdev_rbd_create(client, pool_name, rbd_name, block_size, name=None, user=None, config=None):
    """Create a Ceph RBD block device.

    Args:
        pool_name: Ceph RBD pool name
        rbd_name: Ceph RBD image name
        block_size: block size of RBD volume
        name: name of block device (optional)
        user: Ceph user name (optional)
        config: map of config keys to values (optional)

    Returns:
        Name of created block device.
    """
    params = {
        'pool_name': pool_name,
        'rbd_name': rbd_name,
        'block_size': block_size,
    }

    if name:
        params['name'] = name
    if user is not None:
        params['user_id'] = user
    if config is not None:
        params['config'] = config

    return client.call('bdev_rbd_create', params)


@deprecated_alias('delete_rbd_bdev')
def bdev_rbd_delete(client, name):
    """Remove rbd bdev from the system.

    Args:
        name: name of rbd bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_rbd_delete', params)


@deprecated_alias('construct_error_bdev')
def bdev_error_create(client, base_name):
    """Construct an error injection block device.

    Args:
        base_name: base bdev name
    """
    params = {'base_name': base_name}
    return client.call('bdev_error_create', params)


def bdev_delay_create(client, base_bdev_name, name, avg_read_latency, p99_read_latency, avg_write_latency, p99_write_latency):
    """Construct a delay block device.

    Args:
        base_bdev_name: name of the existing bdev
        name: name of block device
        avg_read_latency: complete 99% of read ops with this delay
        p99_read_latency: complete 1% of read ops with this delay
        avg_write_latency: complete 99% of write ops with this delay
        p99_write_latency: complete 1% of write ops with this delay

    Returns:
        Name of created block device.
    """
    params = {
        'base_bdev_name': base_bdev_name,
        'name': name,
        'avg_read_latency': avg_read_latency,
        'p99_read_latency': p99_read_latency,
        'avg_write_latency': avg_write_latency,
        'p99_write_latency': p99_write_latency,
    }
    return client.call('bdev_delay_create', params)


def bdev_delay_delete(client, name):
    """Remove delay bdev from the system.

    Args:
        name: name of delay bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_delay_delete', params)


def bdev_delay_update_latency(client, delay_bdev_name, latency_type, latency_us):
    """Update the latency value for a delay block device

    Args:
        delay_bdev_name: name of the delay bdev
        latency_type: 'one of: avg_read, avg_write, p99_read, p99_write. No other values accepted.'
        latency_us: 'new latency value.'

    Returns:
        True if successful, or a specific error otherwise.
    """
    params = {
        'delay_bdev_name': delay_bdev_name,
        'latency_type': latency_type,
        'latency_us': latency_us,
    }
    return client.call('bdev_delay_update_latency', params)


@deprecated_alias('delete_error_bdev')
def bdev_error_delete(client, name):
    """Remove error bdev from the system.

    Args:
        bdev_name: name of error bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_error_delete', params)


@deprecated_alias('construct_iscsi_bdev')
def bdev_iscsi_create(client, name, url, initiator_iqn):
    """Construct an iSCSI block device.

    Args:
        name: name of block device
        url: iSCSI URL
        initiator_iqn: IQN name to be used by initiator

    Returns:
        Name of created block device.
    """
    params = {
        'name': name,
        'url': url,
        'initiator_iqn': initiator_iqn,
    }
    return client.call('bdev_iscsi_create', params)


@deprecated_alias('delete_iscsi_bdev')
def bdev_iscsi_delete(client, name):
    """Remove iSCSI bdev from the system.

    Args:
        bdev_name: name of iSCSI bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_iscsi_delete', params)


@deprecated_alias('construct_pmem_bdev')
def bdev_pmem_create(client, pmem_file, name):
    """Construct a libpmemblk block device.

    Args:
        pmem_file: path to pmemblk pool file
        name: name of block device

    Returns:
        Name of created block device.
    """
    params = {
        'pmem_file': pmem_file,
        'name': name
    }
    return client.call('bdev_pmem_create', params)


@deprecated_alias('delete_pmem_bdev')
def bdev_pmem_delete(client, name):
    """Remove pmem bdev from the system.

    Args:
        name: name of pmem bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_pmem_delete', params)


@deprecated_alias('construct_passthru_bdev')
def bdev_passthru_create(client, base_bdev_name, name):
    """Construct a pass-through block device.

    Args:
        base_bdev_name: name of the existing bdev
        name: name of block device

    Returns:
        Name of created block device.
    """
    params = {
        'base_bdev_name': base_bdev_name,
        'name': name,
    }
    return client.call('bdev_passthru_create', params)


@deprecated_alias('delete_passthru_bdev')
def bdev_passthru_delete(client, name):
    """Remove pass through bdev from the system.

    Args:
        name: name of pass through bdev to delete
    """
    params = {'name': name}
    return client.call('bdev_passthru_delete', params)


def bdev_opal_create(client, nvme_ctrlr_name, nsid, locking_range_id, range_start, range_length, password):
    """Create opal virtual block devices from a base nvme bdev.

    Args:
        nvme_ctrlr_name: name of the nvme ctrlr
        nsid: namespace ID of nvme ctrlr
        locking_range_id: locking range ID corresponding to this virtual bdev
        range_start: start address of this locking range
        range_length: length of this locking range
        password: admin password of base nvme bdev

    Returns:
        Name of the new created block devices.
    """
    params = {
        'nvme_ctrlr_name': nvme_ctrlr_name,
        'nsid': nsid,
        'locking_range_id': locking_range_id,
        'range_start': range_start,
        'range_length': range_length,
        'password': password,
    }

    return client.call('bdev_opal_create', params)


def bdev_opal_get_info(client, bdev_name, password):
    """Get opal locking range info.

    Args:
        bdev_name: name of opal vbdev to get info
        password: admin password

    Returns:
        Locking range info.
    """
    params = {
        'bdev_name': bdev_name,
        'password': password,
    }

    return client.call('bdev_opal_get_info', params)


def bdev_opal_delete(client, bdev_name, password):
    """Delete opal virtual bdev from the system.

    Args:
        bdev_name: name of opal vbdev to delete
        password: admin password of base nvme bdev
    """
    params = {
        'bdev_name': bdev_name,
        'password': password,
    }

    return client.call('bdev_opal_delete', params)


def bdev_opal_new_user(client, bdev_name, admin_password, user_id, user_password):
    """Add a user to opal bdev who can set lock state for this bdev.

    Args:
        bdev_name: name of opal vbdev
        admin_password: admin password
        user_id: ID of the user who will be added to this opal bdev
        user_password: password set for this user
    """
    params = {
        'bdev_name': bdev_name,
        'admin_password': admin_password,
        'user_id': user_id,
        'user_password': user_password,
    }

    return client.call('bdev_opal_new_user', params)


def bdev_opal_set_lock_state(client, bdev_name, user_id, password, lock_state):
    """set lock state for an opal bdev.

    Args:
        bdev_name: name of opal vbdev
        user_id: ID of the user who will set lock state
        password: password of the user
        lock_state: lock state to set
    """
    params = {
        'bdev_name': bdev_name,
        'user_id': user_id,
        'password': password,
        'lock_state': lock_state,
    }

    return client.call('bdev_opal_set_lock_state', params)


@deprecated_alias('construct_split_vbdev')
def bdev_split_create(client, base_bdev, split_count, split_size_mb=None):
    """Create split block devices from a base bdev.

    Args:
        base_bdev: name of bdev to split
        split_count: number of split bdevs to create
        split_size_mb: size of each split volume in MiB (optional)

    Returns:
        List of created block devices.
    """
    params = {
        'base_bdev': base_bdev,
        'split_count': split_count,
    }
    if split_size_mb:
        params['split_size_mb'] = split_size_mb

    return client.call('bdev_split_create', params)


@deprecated_alias('destruct_split_vbdev')
def bdev_split_delete(client, base_bdev):
    """Delete split block devices.

    Args:
        base_bdev: name of previously split bdev
    """
    params = {
        'base_bdev': base_bdev,
    }

    return client.call('bdev_split_delete', params)


@deprecated_alias('construct_ftl_bdev')
def bdev_ftl_create(client, name, trtype, traddr, **kwargs):
    """Construct FTL bdev

    Args:
        name: name of the bdev
        trtype: transport type
        traddr: transport address
        kwargs: optional parameters
    """
    params = {'name': name,
              'trtype': trtype,
              'traddr': traddr}
    for key, value in kwargs.items():
        if value is not None:
            params[key] = value

    return client.call('bdev_ftl_create', params)


@deprecated_alias('delete_ftl_bdev')
def bdev_ftl_delete(client, name):
    """Delete FTL bdev

    Args:
        name: name of the bdev
    """
    params = {'name': name}

    return client.call('bdev_ftl_delete', params)


def bdev_ocssd_create(client, ctrlr_name, bdev_name, nsid=None, range=None):
    """Creates Open Channel zoned bdev on specified Open Channel controller

    Args:
        ctrlr_name: name of the OC NVMe controller
        bdev_name: name of the bdev to create
        nsid: namespace ID
        range: parallel unit range
    """
    params = {'ctrlr_name': ctrlr_name,
              'bdev_name': bdev_name}

    if nsid is not None:
        params['nsid'] = nsid

    if range is not None:
        params['range'] = range

    return client.call('bdev_ocssd_create', params)


def bdev_ocssd_delete(client, name):
    """Deletes Open Channel bdev

    Args:
        name: name of the bdev
    """
    params = {'name': name}

    return client.call('bdev_ocssd_delete', params)


@deprecated_alias('get_bdevs')
def bdev_get_bdevs(client, name=None):
    """Get information about block devices.

    Args:
        name: bdev name to query (optional; if omitted, query all bdevs)

    Returns:
        List of bdev information objects.
    """
    params = {}
    if name:
        params['name'] = name
    return client.call('bdev_get_bdevs', params)


@deprecated_alias('get_bdevs_iostat')
def bdev_get_iostat(client, name=None):
    """Get I/O statistics for block devices.

    Args:
        name: bdev name to query (optional; if omitted, query all bdevs)

    Returns:
        I/O statistics for the requested block devices.
    """
    params = {}
    if name:
        params['name'] = name
    return client.call('bdev_get_iostat', params)


@deprecated_alias('enable_bdev_histogram')
def bdev_enable_histogram(client, name, enable):
    """Control whether histogram is enabled for specified bdev.

    Args:
        bdev_name: name of bdev
    """
    params = {'name': name, "enable": enable}
    return client.call('bdev_enable_histogram', params)


@deprecated_alias('get_bdev_histogram')
def bdev_get_histogram(client, name):
    """Get histogram for specified bdev.

    Args:
        bdev_name: name of bdev
    """
    params = {'name': name}
    return client.call('bdev_get_histogram', params)


@deprecated_alias('bdev_inject_error')
def bdev_error_inject_error(client, name, io_type, error_type, num=1):
    """Inject an error via an error bdev.

    Args:
        name: name of error bdev
        io_type: one of "clear", "read", "write", "unmap", "flush", or "all"
        error_type: one of "failure" or "pending"
        num: number of commands to fail
    """
    params = {
        'name': name,
        'io_type': io_type,
        'error_type': error_type,
        'num': num,
    }

    return client.call('bdev_error_inject_error', params)


@deprecated_alias('set_bdev_qd_sampling_period')
def bdev_set_qd_sampling_period(client, name, period):
    """Enable queue depth tracking on a specified bdev.

    Args:
        name: name of a bdev on which to track queue depth.
        period: period (in microseconds) at which to update the queue depth reading. If set to 0, polling will be disabled.
    """

    params = {}
    params['name'] = name
    params['period'] = period
    return client.call('bdev_set_qd_sampling_period', params)


@deprecated_alias('set_bdev_qos_limit')
def bdev_set_qos_limit(
        client,
        name,
        rw_ios_per_sec=None,
        rw_mbytes_per_sec=None,
        r_mbytes_per_sec=None,
        w_mbytes_per_sec=None):
    """Set QoS rate limit on a block device.

    Args:
        name: name of block device
        rw_ios_per_sec: R/W IOs per second limit (>=10000, example: 20000). 0 means unlimited.
        rw_mbytes_per_sec: R/W megabytes per second limit (>=10, example: 100). 0 means unlimited.
        r_mbytes_per_sec: Read megabytes per second limit (>=10, example: 100). 0 means unlimited.
        w_mbytes_per_sec: Write megabytes per second limit (>=10, example: 100). 0 means unlimited.
    """
    params = {}
    params['name'] = name
    if rw_ios_per_sec is not None:
        params['rw_ios_per_sec'] = rw_ios_per_sec
    if rw_mbytes_per_sec is not None:
        params['rw_mbytes_per_sec'] = rw_mbytes_per_sec
    if r_mbytes_per_sec is not None:
        params['r_mbytes_per_sec'] = r_mbytes_per_sec
    if w_mbytes_per_sec is not None:
        params['w_mbytes_per_sec'] = w_mbytes_per_sec
    return client.call('bdev_set_qos_limit', params)


@deprecated_alias('apply_firmware')
def bdev_nvme_apply_firmware(client, bdev_name, filename):
    """Download and commit firmware to NVMe device.

    Args:
        bdev_name: name of NVMe block device
        filename: filename of the firmware to download
    """
    params = {
        'filename': filename,
        'bdev_name': bdev_name,
    }
    return client.call('bdev_nvme_apply_firmware', params)