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-rw-r--r--networking_sfc/db/migration/README3
-rw-r--r--networking_sfc/db/migration/__init__.py0
-rw-r--r--networking_sfc/db/migration/alembic_migrations/__init__.py0
-rw-r--r--networking_sfc/db/migration/alembic_migrations/env.py88
-rw-r--r--networking_sfc/db/migration/alembic_migrations/script.py.mako36
-rw-r--r--networking_sfc/db/migration/alembic_migrations/versions/HEADS2
-rw-r--r--networking_sfc/db/migration/alembic_migrations/versions/liberty/contract/48072cb59133_initial.py33
-rw-r--r--networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/24fc7241aa5_initial.py33
-rw-r--r--networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/5a475fc853e6_ovs_data_model.py87
-rw-r--r--networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/9768e6a66c9_flowclassifier_data_model.py61
-rw-r--r--networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/c3e178d4a985_sfc_data_model.py119
-rw-r--r--networking_sfc/db/migration/alembic_migrations/versions/start_networking_sfc.py30
-rw-r--r--networking_sfc/db/migration/models/__init__.py0
-rw-r--r--networking_sfc/db/migration/models/head.py23
14 files changed, 515 insertions, 0 deletions
diff --git a/networking_sfc/db/migration/README b/networking_sfc/db/migration/README
new file mode 100644
index 0000000..20c6fb9
--- /dev/null
+++ b/networking_sfc/db/migration/README
@@ -0,0 +1,3 @@
+For details refer to:
+http://docs.openstack.org/developer/networking-sfc/alembic_migration.html
+
diff --git a/networking_sfc/db/migration/__init__.py b/networking_sfc/db/migration/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/networking_sfc/db/migration/__init__.py
diff --git a/networking_sfc/db/migration/alembic_migrations/__init__.py b/networking_sfc/db/migration/alembic_migrations/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/networking_sfc/db/migration/alembic_migrations/__init__.py
diff --git a/networking_sfc/db/migration/alembic_migrations/env.py b/networking_sfc/db/migration/alembic_migrations/env.py
new file mode 100644
index 0000000..e2f858a
--- /dev/null
+++ b/networking_sfc/db/migration/alembic_migrations/env.py
@@ -0,0 +1,88 @@
+# Copyright 2015 Futurewei. All rights reserved.
+#
+# 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.
+
+from logging import config as logging_config
+
+from alembic import context
+from neutron.db import model_base
+from oslo_config import cfg
+from oslo_db.sqlalchemy import session
+import sqlalchemy as sa
+from sqlalchemy import event
+
+from networking_sfc.db.migration.models import head # noqa
+
+
+MYSQL_ENGINE = None
+SFC_VERSION_TABLE = 'alembic_version_sfc'
+config = context.config
+neutron_config = config.neutron_config
+logging_config.fileConfig(config.config_file_name)
+target_metadata = model_base.BASEV2.metadata
+
+
+def set_mysql_engine():
+ try:
+ mysql_engine = neutron_config.command.mysql_engine
+ except cfg.NoSuchOptError:
+ mysql_engine = None
+
+ global MYSQL_ENGINE
+ MYSQL_ENGINE = (mysql_engine or
+ model_base.BASEV2.__table_args__['mysql_engine'])
+
+
+def run_migrations_offline():
+ set_mysql_engine()
+
+ kwargs = dict()
+ if neutron_config.database.connection:
+ kwargs['url'] = neutron_config.database.connection
+ else:
+ kwargs['dialect_name'] = neutron_config.database.engine
+ kwargs['version_table'] = SFC_VERSION_TABLE
+ context.configure(**kwargs)
+
+ with context.begin_transaction():
+ context.run_migrations()
+
+
+@event.listens_for(sa.Table, 'after_parent_attach')
+def set_storage_engine(target, parent):
+ if MYSQL_ENGINE:
+ target.kwargs['mysql_engine'] = MYSQL_ENGINE
+
+
+def run_migrations_online():
+ set_mysql_engine()
+ engine = session.create_engine(neutron_config.database.connection)
+
+ connection = engine.connect()
+ context.configure(
+ connection=connection,
+ target_metadata=target_metadata,
+ version_table=SFC_VERSION_TABLE
+ )
+ try:
+ with context.begin_transaction():
+ context.run_migrations()
+ finally:
+ connection.close()
+ engine.dispose()
+
+
+if context.is_offline_mode():
+ run_migrations_offline()
+else:
+ run_migrations_online()
diff --git a/networking_sfc/db/migration/alembic_migrations/script.py.mako b/networking_sfc/db/migration/alembic_migrations/script.py.mako
new file mode 100644
index 0000000..5f14159
--- /dev/null
+++ b/networking_sfc/db/migration/alembic_migrations/script.py.mako
@@ -0,0 +1,36 @@
+# Copyright 2015 Futurewei. All rights reserved.
+#
+# 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.
+#
+
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision}
+Create Date: ${create_date}
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+% if branch_labels:
+branch_labels = ${repr(branch_labels)}
+%endif
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+def upgrade():
+ ${upgrades if upgrades else "pass"}
diff --git a/networking_sfc/db/migration/alembic_migrations/versions/HEADS b/networking_sfc/db/migration/alembic_migrations/versions/HEADS
new file mode 100644
index 0000000..152ab9e
--- /dev/null
+++ b/networking_sfc/db/migration/alembic_migrations/versions/HEADS
@@ -0,0 +1,2 @@
+48072cb59133
+5a475fc853e6
diff --git a/networking_sfc/db/migration/alembic_migrations/versions/liberty/contract/48072cb59133_initial.py b/networking_sfc/db/migration/alembic_migrations/versions/liberty/contract/48072cb59133_initial.py
new file mode 100644
index 0000000..87b53ce
--- /dev/null
+++ b/networking_sfc/db/migration/alembic_migrations/versions/liberty/contract/48072cb59133_initial.py
@@ -0,0 +1,33 @@
+# Copyright 2015 Futurewei. All rights reserved.
+#
+# 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.
+
+"""Initial Mitaka no-op script.
+
+Revision ID: 48072cb59133
+Revises: start_networking_sfc
+Create Date: 2015-07-28 22:18:13.330846
+
+"""
+
+from neutron.db.migration import cli
+
+
+# revision identifiers, used by Alembic.
+revision = '48072cb59133'
+down_revision = 'start_networking_sfc'
+branch_labels = (cli.CONTRACT_BRANCH,)
+
+
+def upgrade():
+ pass
diff --git a/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/24fc7241aa5_initial.py b/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/24fc7241aa5_initial.py
new file mode 100644
index 0000000..f23c9b3
--- /dev/null
+++ b/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/24fc7241aa5_initial.py
@@ -0,0 +1,33 @@
+# Copyright 2015 Futurewei. All rights reserved.
+#
+# 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.
+
+"""Initial Mitaka no-op script.
+
+Revision ID: 24fc7241aa5
+Revises: start_networking_sfc
+Create Date: 2015-09-11 11:37:19.349951
+
+"""
+
+from neutron.db.migration import cli
+
+
+# revision identifiers, used by Alembic.
+revision = '24fc7241aa5'
+down_revision = 'start_networking_sfc'
+branch_labels = (cli.EXPAND_BRANCH,)
+
+
+def upgrade():
+ pass
diff --git a/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/5a475fc853e6_ovs_data_model.py b/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/5a475fc853e6_ovs_data_model.py
new file mode 100644
index 0000000..e257548
--- /dev/null
+++ b/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/5a475fc853e6_ovs_data_model.py
@@ -0,0 +1,87 @@
+# Copyright 2015 Futurewei. All rights reserved.
+#
+# 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.
+
+"""Defining OVS data-model
+
+Revision ID: 5a475fc853e6
+Revises: c3e178d4a985
+Create Date: 2015-09-30 18:00:57.758762
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '5a475fc853e6'
+down_revision = 'c3e178d4a985'
+
+
+def upgrade():
+ op.create_table('sfc_portpair_details',
+ sa.Column('tenant_id', sa.String(length=255), nullable=True),
+ sa.Column('id', sa.String(length=36), nullable=False),
+ sa.Column('ingress', sa.String(length=36), nullable=True),
+ sa.Column('egress', sa.String(length=36), nullable=True),
+ sa.Column('host_id', sa.String(length=255), nullable=False),
+ sa.Column('mac_address', sa.String(length=32), nullable=False),
+ sa.Column('network_type', sa.String(length=8), nullable=True),
+ sa.Column('segment_id', sa.Integer(), nullable=True),
+ sa.Column('local_endpoint', sa.String(length=64), nullable=False),
+ sa.PrimaryKeyConstraint('id')
+ )
+
+ op.create_index(
+ op.f('ix_sfc_portpair_details_tenant_id'),
+ 'sfc_portpair_details', ['tenant_id'], unique=False
+ )
+ op.create_table('sfc_uuid_intid_associations',
+ sa.Column('id', sa.String(length=36), nullable=False),
+ sa.Column('uuid', sa.String(length=36), nullable=False),
+ sa.Column('intid', sa.Integer(), nullable=False),
+ sa.Column('type_', sa.String(length=32), nullable=False),
+ sa.PrimaryKeyConstraint('id', 'uuid'),
+ sa.UniqueConstraint('intid')
+ )
+
+ op.create_table('sfc_path_nodes',
+ sa.Column('tenant_id', sa.String(length=255), nullable=True),
+ sa.Column('id', sa.String(length=36), nullable=False),
+ sa.Column('nsp', sa.Integer(), nullable=False),
+ sa.Column('nsi', sa.Integer(), nullable=False),
+ sa.Column('node_type', sa.String(length=32), nullable=True),
+ sa.Column('portchain_id', sa.String(length=255), nullable=True),
+ sa.Column('status', sa.String(length=32), nullable=True),
+ sa.Column('next_group_id', sa.Integer(), nullable=True),
+ sa.Column('next_hop', sa.String(length=512), nullable=True),
+ sa.ForeignKeyConstraint(['portchain_id'], ['sfc_port_chains.id'],
+ ondelete='CASCADE'),
+ sa.PrimaryKeyConstraint('id')
+ )
+ op.create_index(
+ op.f('ix_sfc_path_nodes_tenant_id'),
+ 'sfc_path_nodes', ['tenant_id'], unique=False
+ )
+
+ op.create_table('sfc_path_port_associations',
+ sa.Column('pathnode_id', sa.String(length=36), nullable=False),
+ sa.Column('portpair_id', sa.String(length=36), nullable=False),
+ sa.Column('weight', sa.Integer(), nullable=False),
+ sa.ForeignKeyConstraint(['pathnode_id'], ['sfc_path_nodes.id'],
+ ondelete='CASCADE'),
+ sa.ForeignKeyConstraint(['portpair_id'], ['sfc_portpair_details.id'],
+ ondelete='CASCADE'),
+ sa.PrimaryKeyConstraint('pathnode_id', 'portpair_id')
+ )
diff --git a/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/9768e6a66c9_flowclassifier_data_model.py b/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/9768e6a66c9_flowclassifier_data_model.py
new file mode 100644
index 0000000..e43e9c1
--- /dev/null
+++ b/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/9768e6a66c9_flowclassifier_data_model.py
@@ -0,0 +1,61 @@
+# Copyright 2015 Futurewei. All rights reserved.
+#
+# 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.
+
+"""Defining flow-classifier data-model
+
+Revision ID: 9768e6a66c9
+Revises: 24fc7241aa5
+Create Date: 2015-09-30 17:54:35.852573
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+from neutron.api.v2 import attributes as attr
+
+# revision identifiers, used by Alembic.
+revision = '9768e6a66c9'
+down_revision = '24fc7241aa5'
+
+
+def upgrade():
+ op.create_table(
+ 'sfc_flow_classifiers',
+ sa.Column('tenant_id', sa.String(length=attr.TENANT_ID_MAX_LEN),
+ nullable=True, index=True),
+ sa.Column('id', sa.String(length=36), nullable=False),
+ sa.Column('name', sa.String(length=attr.NAME_MAX_LEN), nullable=True),
+ sa.Column('ethertype', sa.String(length=40), nullable=True),
+ sa.Column('protocol', sa.String(length=40), nullable=True),
+ sa.Column('description', sa.String(length=attr.DESCRIPTION_MAX_LEN),
+ nullable=True),
+ sa.Column('source_port_range_min', sa.Integer(), nullable=True),
+ sa.Column('source_port_range_max', sa.Integer(), nullable=True),
+ sa.Column('destination_port_range_min', sa.Integer(), nullable=True),
+ sa.Column('destination_port_range_max', sa.Integer(), nullable=True),
+ sa.Column('source_ip_prefix', sa.String(length=255), nullable=True),
+ sa.Column('destination_ip_prefix', sa.String(length=255),
+ nullable=True),
+ sa.PrimaryKeyConstraint('id')
+ )
+
+ op.create_table(
+ 'sfc_flow_classifier_l7_parameters',
+ sa.Column('keyword', sa.String(length=255), nullable=False),
+ sa.Column('value', sa.String(length=255), nullable=True),
+ sa.Column('classifier_id', sa.String(length=36), nullable=False),
+ sa.ForeignKeyConstraint(['classifier_id'], ['sfc_flow_classifiers.id'], ),
+ sa.PrimaryKeyConstraint('keyword', 'classifier_id')
+ )
diff --git a/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/c3e178d4a985_sfc_data_model.py b/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/c3e178d4a985_sfc_data_model.py
new file mode 100644
index 0000000..9f5362a
--- /dev/null
+++ b/networking_sfc/db/migration/alembic_migrations/versions/liberty/expand/c3e178d4a985_sfc_data_model.py
@@ -0,0 +1,119 @@
+# Copyright 2015 Futurewei. All rights reserved.
+#
+# 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.
+
+"""Defining Port Chain data-model.
+
+Revision ID: c3e178d4a985
+Revises: 9768e6a66c9
+Create Date: 2015-09-11 11:37:19.349951
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+from neutron.api.v2 import attributes as attr
+
+# revision identifiers, used by Alembic.
+revision = 'c3e178d4a985'
+down_revision = '9768e6a66c9'
+
+
+def upgrade():
+ op.create_table(
+ 'sfc_port_pair_groups',
+ sa.Column('id', sa.String(length=36), nullable=False),
+ sa.Column('tenant_id', sa.String(length=attr.TENANT_ID_MAX_LEN),
+ nullable=True, index=True),
+ sa.Column('name', sa.String(length=attr.NAME_MAX_LEN),
+ nullable=True),
+ sa.Column('description', sa.String(length=attr.DESCRIPTION_MAX_LEN),
+ nullable=True),
+ sa.PrimaryKeyConstraint('id')
+ )
+
+ op.create_table(
+ 'sfc_port_pairs',
+ sa.Column('tenant_id', sa.String(length=attr.TENANT_ID_MAX_LEN),
+ nullable=True, index=True),
+ sa.Column('id', sa.String(length=36), nullable=False),
+ sa.Column('name', sa.String(length=attr.NAME_MAX_LEN), nullable=True),
+ sa.Column('description', sa.String(length=attr.DESCRIPTION_MAX_LEN),
+ nullable=True),
+ sa.Column('ingress', sa.String(length=36), nullable=False),
+ sa.Column('egress', sa.String(length=36), nullable=False),
+ sa.Column('portpairgroup_id', sa.String(length=36), nullable=True),
+ sa.ForeignKeyConstraint(['egress'], ['ports.id'],
+ ondelete='RESTRICT'),
+ sa.ForeignKeyConstraint(['ingress'], ['ports.id'],
+ ondelete='RESTRICT'),
+ sa.ForeignKeyConstraint(['portpairgroup_id'], ['sfc_port_pair_groups.id'],
+ ondelete='RESTRICT'),
+ sa.PrimaryKeyConstraint('id'),
+ sa.UniqueConstraint('ingress', 'egress',
+ name='uniq_sfc_port_pairs0ingress0egress')
+ )
+
+ op.create_table(
+ 'sfc_port_chains',
+ sa.Column('tenant_id', sa.String(length=attr.TENANT_ID_MAX_LEN),
+ nullable=True, index=True),
+ sa.Column('id', sa.String(length=36), nullable=False),
+ sa.Column('name', sa.String(length=attr.NAME_MAX_LEN),
+ nullable=True),
+ sa.Column('description', sa.String(length=attr.DESCRIPTION_MAX_LEN),
+ nullable=True),
+ sa.PrimaryKeyConstraint('id')
+ )
+
+ op.create_table(
+ 'sfc_chain_group_associations',
+ sa.Column('portpairgroup_id', sa.String(length=36), nullable=False),
+ sa.Column('portchain_id', sa.String(length=36), nullable=False),
+ sa.Column('position', sa.Integer(), nullable=True),
+ sa.ForeignKeyConstraint(['portchain_id'], ['sfc_port_chains.id'], ),
+ sa.ForeignKeyConstraint(['portpairgroup_id'], ['sfc_port_pair_groups.id'],
+ ondelete='RESTRICT'),
+ sa.PrimaryKeyConstraint('portpairgroup_id', 'portchain_id')
+ )
+
+ op.create_table(
+ 'sfc_port_chain_parameters',
+ sa.Column('keyword', sa.String(length=255), nullable=False),
+ sa.Column('value', sa.String(length=255), nullable=True),
+ sa.Column('chain_id', sa.String(length=36), nullable=False),
+ sa.ForeignKeyConstraint(['chain_id'], ['sfc_port_chains.id'], ),
+ sa.PrimaryKeyConstraint('keyword', 'chain_id')
+ )
+
+ op.create_table(
+ 'sfc_service_function_params',
+ sa.Column('keyword', sa.String(length=255), nullable=False),
+ sa.Column('value', sa.String(length=255), nullable=True),
+ sa.Column('pair_id', sa.String(length=36), nullable=False),
+ sa.ForeignKeyConstraint(['pair_id'], ['sfc_port_pairs.id'], ),
+ sa.PrimaryKeyConstraint('keyword', 'pair_id')
+ )
+
+ op.create_table(
+ 'sfc_chain_classifier_associations',
+ sa.Column('flowclassifier_id', sa.String(length=36), nullable=False),
+ sa.Column('portchain_id', sa.String(length=36), nullable=False),
+ sa.ForeignKeyConstraint(['flowclassifier_id'],
+ ['sfc_flow_classifiers.id'],
+ ondelete='RESTRICT'),
+ sa.ForeignKeyConstraint(['portchain_id'], ['sfc_port_chains.id'], ),
+ sa.PrimaryKeyConstraint('flowclassifier_id', 'portchain_id'),
+ sa.UniqueConstraint('flowclassifier_id')
+ )
diff --git a/networking_sfc/db/migration/alembic_migrations/versions/start_networking_sfc.py b/networking_sfc/db/migration/alembic_migrations/versions/start_networking_sfc.py
new file mode 100644
index 0000000..4810d1e
--- /dev/null
+++ b/networking_sfc/db/migration/alembic_migrations/versions/start_networking_sfc.py
@@ -0,0 +1,30 @@
+# Copyright 2014 OpenStack Foundation
+#
+# 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.
+#
+
+"""start networking-sfc chain
+
+Revision ID: start_networking_sfc
+Revises: None
+Create Date: 2015-09-10 18:42:08.262632
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'start_networking_sfc'
+down_revision = None
+
+
+def upgrade():
+ pass
diff --git a/networking_sfc/db/migration/models/__init__.py b/networking_sfc/db/migration/models/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/networking_sfc/db/migration/models/__init__.py
diff --git a/networking_sfc/db/migration/models/head.py b/networking_sfc/db/migration/models/head.py
new file mode 100644
index 0000000..1345cd6
--- /dev/null
+++ b/networking_sfc/db/migration/models/head.py
@@ -0,0 +1,23 @@
+# Copyright 2015 Futurewei. All rights reserved.
+#
+# 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.
+
+from neutron.db import model_base
+
+from networking_sfc.db import flowclassifier_db # noqa
+from networking_sfc.db import sfc_db # noqa
+from networking_sfc.services.sfc.drivers.ovs import db as ovs_db # noqa
+
+
+def get_metadata():
+ return model_base.BASEV2.metadata