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OpenStack Study: pci_request.py**** CubicPower OpenStack Study **** def _get_alias_from_config(): """Parse and validate PCI aliases from the nova config.""" jaliases = CONF.pci_alias aliases = {} # map alias name to alias spec list try: for jsonspecs in jaliases: spec = jsonutils.loads(jsonspecs) jsonschema.validate(spec, _ALIAS_SCHEMA) name = spec.pop("name") if name not in aliases: aliases[name] = [spec] else: if aliases[name][0]["device_type"] == spec["device_type"]: aliases[name].append(spec) else: reason = "Device type mismatch for alias '%s'" % name raise exception.PciInvalidAlias(reason=reason) except exception.PciInvalidAlias: raise except Exception as e: raise exception.PciInvalidAlias(reason=str(e)) return aliases
**** CubicPower OpenStack Study **** def _translate_alias_to_requests(alias_spec): """Generate complete pci requests from pci aliases in extra_spec.""" pci_aliases = _get_alias_from_config() pci_requests = [] # list of a specs dict alias_spec = alias_spec.replace(' ', '') for name, count in [spec.split(':') for spec in alias_spec.split(',')]: if name not in pci_aliases: raise exception.PciRequestAliasNotDefined(alias=name) else: request = {'count': int(count), 'spec': copy.deepcopy(pci_aliases[name]), 'alias_name': name} pci_requests.append(request) return pci_requests
**** CubicPower OpenStack Study **** def get_pci_requests_from_flavor(flavor): """Get flavor's pci request. The pci_passthrough:alias scope in flavor extra_specs describes the flavor's pci requests, the key is 'pci_passthrough:alias' and the value has format 'alias_name_x:count, alias_name_y:count, ... '. The alias_name is defined in 'pci_alias' configurations. The flavor's requirement is translated into pci requests list, each entry in the list is a dictionary. The dictionary has three keys. The 'specs' gives the pci device properties requirement, the 'count' gives the number of devices, and the optional 'alias_name' is the corresponding alias definition name. Example: Assume alias configuration is: {'vendor_id':'8086', 'device_id':'1502', 'name':'alias_1'} The flavor extra specs includes: 'pci_passthrough:alias': 'alias_1:2'. The returned pci_requests are: pci_requests = [{'count':2, 'specs': [{'vendor_id':'8086', 'device_id':'1502'}], 'alias_name': 'alias_1'}] :param flavor: the flavor to be checked :returns: a list of pci requests """ if 'extra_specs' not in flavor: return [] pci_requests = [] if 'pci_passthrough:alias' in flavor['extra_specs']: pci_requests = _translate_alias_to_requests( flavor['extra_specs']['pci_passthrough:alias']) return pci_requests
**** CubicPower OpenStack Study **** def get_instance_pci_requests(instance, prefix=""): """Get instance's pci allocation requirement. After a flavor's pci requirement is translated into pci requests, the requests are kept in instance's system metadata to avoid future flavor access and translation. This function get the pci requests from instance system metadata directly. As save_flavor_pci_info(), the prefix can be used to stash information about another flavor for later use, like in resize. """ if 'system_metadata' not in instance: return [] system_metadata = utils.instance_sys_meta(instance) pci_requests = system_metadata.get('%spci_requests' % prefix) if not pci_requests: return [] return jsonutils.loads(pci_requests)
**** CubicPower OpenStack Study **** def save_flavor_pci_info(metadata, instance_type, prefix=''): """Save flavor's pci information to metadata. To reduce flavor access and pci request translation, the translated pci requests are saved into instance's system metadata. As save_flavor_info(), the prefix can be used to stash information about another flavor for later use, like in resize. """ pci_requests = get_pci_requests_from_flavor(instance_type) if pci_requests: to_key = '%spci_requests' % prefix metadata[to_key] = jsonutils.dumps(pci_requests)
**** CubicPower OpenStack Study **** def delete_flavor_pci_info(metadata, *prefixes): """Delete pci requests information from instance's system_metadata.""" for prefix in prefixes: to_key = '%spci_requests' % prefix if to_key in metadata: del metadata[to_key]
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