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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import abc
from oslo_log import log as logging
from cinder.common import constants
from cinder import exception
from cinder.i18n import _
from cinder.volume.targets import driver
LOG = logging.getLogger(__name__)
class UnsupportedNVMETProtocol(exception.Invalid):
message = _("An invalid 'target_protocol' "
"value was provided: %(protocol)s")
class NVMeOF(driver.Target):
"""Target object for block storage devices with RDMA transport."""
protocol = constants.NVMEOF_VARIANT_2
target_protocol_map = {
'nvmet_rdma': 'rdma',
'nvmet_tcp': 'tcp',
}
def __init__(self, *args, **kwargs):
"""Reads NVMeOF configurations."""
super(NVMeOF, self).__init__(*args, **kwargs)
self.target_ip = self.configuration.target_ip_address
self.target_port = self.configuration.target_port
self.nvmet_port_id = self.configuration.nvmet_port_id
self.nvmet_ns_id = self.configuration.nvmet_ns_id
self.nvmet_subsystem_name = self.configuration.target_prefix
target_protocol = self.configuration.target_protocol
if target_protocol in self.target_protocol_map:
self.nvme_transport_type = self.target_protocol_map[
target_protocol]
else:
raise UnsupportedNVMETProtocol(
protocol=target_protocol
)
def initialize_connection(self, volume, connector):
"""Returns the connection info.
In NVMeOF driver, :driver_volume_type: is set to 'nvmeof',
:data: is the driver data that has the value of
_get_connection_properties.
Example return value:
.. code-block:: json
{
"driver_volume_type": "nvmeof",
"data":
{
"target_portal": "1.1.1.1",
"target_port": 4420,
"nqn": "nqn.volume-0001",
"transport_type": "rdma",
"ns_id": 10
}
}
"""
return {
'driver_volume_type': self.protocol,
'data': self._get_connection_properties(volume)
}
def _get_connection_properties(self, volume):
"""Gets NVMeOF connection configuration.
:return: dictionary of the following keys:
:target_portal: NVMe target IP address
:target_port: NVMe target port
:nqn: NQN of the NVMe target
:transport_type: Network fabric being used for an
NVMe-over-Fabrics network
:ns_id: namespace id associated with the subsystem
"""
location = volume['provider_location']
target_connection, nvme_transport_type, nqn, nvmet_ns_id = (
location.split(' '))
target_portal, target_port = target_connection.split(':')
return {
'target_portal': target_portal,
'target_port': target_port,
'nqn': nqn,
'transport_type': nvme_transport_type,
'ns_id': nvmet_ns_id
}
def get_nvmeof_location(self, nqn, target_ip, target_port,
nvme_transport_type, nvmet_ns_id):
"""Serializes driver data into single line string."""
return "%(ip)s:%(port)s %(transport)s %(nqn)s %(ns_id)s" % (
{'ip': target_ip,
'port': target_port,
'transport': nvme_transport_type,
'nqn': nqn,
'ns_id': nvmet_ns_id})
def terminate_connection(self, volume, connector, **kwargs):
pass
def create_export(self, context, volume, volume_path):
"""Creates export data for a logical volume."""
return self.create_nvmeof_target(
volume['id'],
self.configuration.target_prefix,
self.target_ip,
self.target_port,
self.nvme_transport_type,
self.nvmet_port_id,
self.nvmet_ns_id,
volume_path)
def ensure_export(self, context, volume, volume_path):
pass
def remove_export(self, context, volume):
return self.delete_nvmeof_target(volume)
def validate_connector(self, connector):
if 'initiator' not in connector:
LOG.error('The volume driver requires the NVMe initiator '
'name in the connector.')
raise exception.InvalidConnectorException(
missing='initiator')
return True
@abc.abstractmethod
def create_nvmeof_target(self,
volume_id,
subsystem_name,
target_ip,
target_port,
transport_type,
nvmet_port_id,
ns_id,
volume_path):
pass
@abc.abstractmethod
def delete_nvmeof_target(self, target_name):
pass
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