def __init__(self, qid, operator_id, meta_init_name, keys, map_keys, func, p4_raw_fields):
super(P4Map, self).__init__('Map', qid, operator_id, keys, p4_raw_fields)
self.meta_init_name = meta_init_name
self.map_keys = map_keys
self.func = func
# Add map init
map_fields = list()
for fld in self.map_keys:
if fld == 'qid':
map_fields.append(P4Field(layer=None, target_name="qid", sonata_name="qid",
size=QID_SIZE))
elif fld == 'count':
map_fields.append(P4Field(layer=None, target_name="count", sonata_name="count",
size=COUNT_SIZE))
else:
map_fields.append(self.p4_raw_fields.get_target_field(fld))
# create ACTION using the function
primitives = list()
if len(func) > 0:
self.func = func
if func[0] == 'mask' or not func[0]:
for field in map_fields:
# print self.__repr__(), self.map_keys
mask_size = (func[1] / 4)
mask = '0x' + ('f' * mask_size) + ('0' * (HEADER_MASK_SIZE[field.target_name] - mask_size))
field_name = '%s.%s' % (self.meta_init_name, field.target_name.replace(".", "_"))
primitives.append(BitAnd(field_name, field_name, mask))
self.action = Action('do_%s' % self.operator_name, primitives)
# create dummy TABLE to execute the action
self.table = Table(self.operator_name, self.action.get_name(), [], None, 1)
class P4Map(P4Operator):
def __init__(self, qid, operator_id, meta_init_name, keys, map_keys, func, p4_raw_fields):
super(P4Map, self).__init__('Map', qid, operator_id, keys, p4_raw_fields)
self.meta_init_name = meta_init_name
self.map_keys = map_keys
self.func = func
# Add map init
map_fields = list()
for fld in self.map_keys:
if fld == 'qid':
map_fields.append(P4Field(layer=None, target_name="qid", sonata_name="qid",
size=QID_SIZE))
elif fld == 'count':
map_fields.append(P4Field(layer=None, target_name="count", sonata_name="count",
size=COUNT_SIZE))
else:
map_fields.append(self.p4_raw_fields.get_target_field(fld))
# create ACTION using the function
primitives = list()
if len(func) > 0:
self.func = func
if func[0] == 'mask' or not func[0]:
for field in map_fields:
# print self.__repr__(), self.map_keys
mask_size = (func[1] / 4)
mask = '0x' + ('f' * mask_size) + ('0' * (HEADER_MASK_SIZE[field.target_name] - mask_size))
field_name = '%s.%s' % (self.meta_init_name, field.target_name.replace(".", "_"))
primitives.append(BitAnd(field_name, field_name, mask))
self.action = Action('do_%s' % self.operator_name, primitives)
# create dummy TABLE to execute the action
self.table = Table(self.operator_name, self.action.get_name(), [], None, 1)
def __repr__(self):
return '.Map(keys=' + str(self.keys) + ', map_keys=' + str(self.map_keys) + ', func=' + str(self.func) + ')'
def get_code(self):
out = ''
out += '// Map %i of query %i\n' % (self.operator_id, self.query_id)
out += self.action.get_code()
out += self.table.get_code()
out += '\n'
return out
def get_commands(self):
commands = list()
commands.append(self.table.get_default_command())
return commands
def get_control_flow(self, indent_level):
indent = '\t' * indent_level
out = ''
out += '%sapply(%s);\n' % (indent, self.table.get_name())
return out
def get_init_keys(self):
return self.keys
def __init__(self, qid, operator_id, keys, p4_raw_fields):
super(P4MapInit, self).__init__('MapInit', qid, operator_id, keys,
p4_raw_fields)
# Add map init
map_init_fields = list()
for fld in self.keys:
if fld == 'qid':
map_init_fields.append(
P4Field(layer=None,
target_name="qid",
sonata_name="qid",
size=QID_SIZE))
elif fld == 'count':
map_init_fields.append(
P4Field(layer=None,
target_name="count",
sonata_name="count",
size=COUNT_SIZE))
elif fld == 'index':
map_init_fields.append(
P4Field(layer=None,
target_name="index",
sonata_name="index",
size=INDEX_SIZE))
else:
map_init_fields.append(
self.p4_raw_fields.get_target_field(fld))
# create METADATA object to store data for all keys
meta_fields = list()
for fld in map_init_fields:
meta_fields.append((fld.target_name.replace(".", "_"), fld.size))
self.metadata = MetaData(self.operator_name, meta_fields)
# create ACTION to initialize the metadata
primitives = list()
for fld in map_init_fields:
sonata_name = fld.sonata_name
target_name = fld.target_name
meta_field_name = '%s.%s' % (self.metadata.get_name(),
target_name.replace(".", "_"))
if sonata_name == 'qid':
# Assign query id to this field
primitives.append(ModifyField(meta_field_name, qid))
elif sonata_name == 'count':
primitives.append(ModifyField(meta_field_name, 0))
elif sonata_name == 'index':
primitives.append(ModifyField(meta_field_name, 0))
else:
# Read data from raw header fields and assign them to these meta fields
primitives.append(ModifyField(meta_field_name, target_name))
self.action = Action('do_%s' % self.operator_name, primitives)
# create dummy TABLE to execute the action
self.table = Table(self.operator_name, self.action.get_name(), [],
None, 1)
def mark_satisfied(self):
primitives = list()
primitives.append(ModifyField(self.satisfied_meta_field, 1))
primitives.append(ModifyField(self.clone_meta_field, 1))
self.actions['satisfied'] = Action('do_mark_satisfied_%i' % self.id,
primitives)
self.satisfied_table = Table('mark_satisfied_%i' % self.id,
self.actions['satisfied'].get_name(), [],
None, 1)
def append_out_header(self):
primitives = list()
primitives.append(AddHeader(self.out_header.get_name()))
for fld in self.out_header.fields:
primitives.append(ModifyField('%s.%s' % (self.out_header.get_name(), fld.target_name.replace(".", "_")),
'%s.%s' % (self.meta_init_name, fld.target_name.replace(".", "_"))))
self.actions['append_out_header'] = Action('do_add_out_header_%i' % self.id, primitives)
self.out_header_table = Table('add_out_header_%i' % self.id, self.actions['append_out_header'].get_name(), [],
None, 1)
def init_application(self, app):
queries = dict()
# define final header
# TODO: Use new p4 layer object
tmp = OutHeaders("final_header")
tmp.fields = [P4Field(tmp, "delimiter", "delimiter", 32)]
self.final_header = tmp
primitives = list()
primitives.append(AddHeader(self.final_header.get_name()))
primitives.append(ModifyField('%s.delimiter' % self.final_header.get_name(), 0))
self.final_header_action = Action('do_add_final_header', primitives)
self.final_header_table = Table('add_final_header', self.final_header_action.get_name(), [], None, 1)
# define nop action
self.nop_action = Action('_nop', NoOp())
nop_name = self.nop_action.get_name()
# app metadata
fields = list()
for query_id in app:
fields.append(('%s_%i' % (self.drop_meta_field, query_id), 1))
fields.append(('%s_%i' % (self.satisfied_meta_field, query_id), 1))
fields.append((self.clone_meta_field, 1))
self.metadata = MetaData('app_data', fields)
meta_name = self.metadata.get_name()
# action and table to init app metadata
primitives = list()
for field_name, _ in fields:
primitives.append(ModifyField('%s.%s' % (self.metadata.get_name(), field_name), 0))
self.init_action = Action('do_init_app_metadata', primitives)
self.init_action_table = Table('init_app_metadata', self.init_action.get_name(), [], None, 1)
# transforms queries
for query_id in app:
self.logger.debug('create query pipeline for qid: %i' % (query_id))
parse_payload = app[query_id].parse_payload
payload_fields = app[query_id].payload_fields
read_register = app[query_id].read_register
filter_payload = app[query_id].filter_payload
filter_payload_str = app[query_id].filter_payload_str
operators = app[query_id].operators
query = P4Query(query_id,
parse_payload,
payload_fields,
read_register,
filter_payload,
filter_payload_str,
operators,
nop_name,
'%s.%s' % (meta_name, self.drop_meta_field),
'%s.%s' % (meta_name, self.satisfied_meta_field),
'%s.%s' % (meta_name, self.clone_meta_field), self.p4_raw_fields)
queries[query_id] = query
# define mirroring session
self.mirror_session = MirrorSession(SESSION_ID, SPAN_PORT)
# define report action that clones the packet and sends it to the stream processor
fields = [self.metadata.get_name()]
for query in queries.values():
fields.append(query.get_metadata_name())
self.field_list = FieldList('report_packet', fields)
self.report_action = Action('do_report_packet', CloneIngressPktToEgress(self.mirror_session.get_session_id(),
self.field_list.get_name()))
self.report_action_table = Table('report_packet', self.report_action.get_name(), [], None, 1)
return queries
class P4Application(object):
def __init__(self, app, sonata_fields):
# LOGGING
log_level = logging.DEBUG
self.logger = get_logger('P4Application', 'INFO')
self.logger.setLevel(log_level)
self.logger.info('init')
# Define the root layer for raw packet
# self.root_layer = Ethernet()
# self.p4_raw_fields = P4RawFields(self.root_layer)
self.root_layer = "ethernet"
self.p4_raw_fields = sonata_fields
# define the application metadata
self.drop_meta_field = 'drop'
self.satisfied_meta_field = 'satisfied'
self.clone_meta_field = 'clone'
self.mirror_session = None
self.field_list = None
self.final_header = None
self.final_header_action = None
self.final_header_table = None
self.init_action = None
self.init_action_table = None
self.report_action = None
self.report_action_table = None
self.nop_action = None
self.metadata = None
self.queries = self.init_application(app)
# INIT THE DATASTRUCTURE
def init_application(self, app):
queries = dict()
# define final header
# TODO: Use new p4 layer object
tmp = OutHeaders("final_header")
tmp.fields = [P4Field(tmp, "delimiter", "delimiter", 32)]
self.final_header = tmp
primitives = list()
primitives.append(AddHeader(self.final_header.get_name()))
primitives.append(ModifyField('%s.delimiter' % self.final_header.get_name(), 0))
self.final_header_action = Action('do_add_final_header', primitives)
self.final_header_table = Table('add_final_header', self.final_header_action.get_name(), [], None, 1)
# define nop action
self.nop_action = Action('_nop', NoOp())
nop_name = self.nop_action.get_name()
# app metadata
fields = list()
for query_id in app:
fields.append(('%s_%i' % (self.drop_meta_field, query_id), 1))
fields.append(('%s_%i' % (self.satisfied_meta_field, query_id), 1))
fields.append((self.clone_meta_field, 1))
self.metadata = MetaData('app_data', fields)
meta_name = self.metadata.get_name()
# action and table to init app metadata
primitives = list()
for field_name, _ in fields:
primitives.append(ModifyField('%s.%s' % (self.metadata.get_name(), field_name), 0))
self.init_action = Action('do_init_app_metadata', primitives)
self.init_action_table = Table('init_app_metadata', self.init_action.get_name(), [], None, 1)
# transforms queries
for query_id in app:
self.logger.debug('create query pipeline for qid: %i' % (query_id))
parse_payload = app[query_id].parse_payload
payload_fields = app[query_id].payload_fields
read_register = app[query_id].read_register
filter_payload = app[query_id].filter_payload
filter_payload_str = app[query_id].filter_payload_str
operators = app[query_id].operators
query = P4Query(query_id,
parse_payload,
payload_fields,
read_register,
filter_payload,
filter_payload_str,
operators,
nop_name,
'%s.%s' % (meta_name, self.drop_meta_field),
'%s.%s' % (meta_name, self.satisfied_meta_field),
'%s.%s' % (meta_name, self.clone_meta_field), self.p4_raw_fields)
queries[query_id] = query
# define mirroring session
self.mirror_session = MirrorSession(SESSION_ID, SPAN_PORT)
# define report action that clones the packet and sends it to the stream processor
fields = [self.metadata.get_name()]
for query in queries.values():
fields.append(query.get_metadata_name())
self.field_list = FieldList('report_packet', fields)
self.report_action = Action('do_report_packet', CloneIngressPktToEgress(self.mirror_session.get_session_id(),
self.field_list.get_name()))
self.report_action_table = Table('report_packet', self.report_action.get_name(), [], None, 1)
return queries
# COMPILE THE CODE
def get_p4_code(self):
p4_src = ''
# Get parser for raw headers (layers) that are specific to the fields used in Sonata queries
p4_src += self.get_raw_parser_code()
# P4 INVARIANTS
p4_src += self.get_invariants()
# OUT HEADER PARSER
p4_src += self.get_out_header_parser()
# APP METADATA, ACTIONS, FIELDLISTS, TABLES
p4_src += self.get_app_code()
# QUERY METADATA, HEADERS, TABLES AND ACTIONS
p4_src += self.get_code()
# get original packet repeat code
if ORIGINAL_PACKET: p4_src += self.get_original_repeat_code()
# INGRESS PIPELINE
p4_src += self.get_ingress_pipeline()
# EGRESS PIPELINE
if ORIGINAL_PACKET:
p4_src += "control egress { }"
else:
p4_src += self.get_egress_pipeline()
return p4_src
def get_invariants(self):
# Call this from respective layer classes
out = ''
out += 'parser start {\n'
out += '\treturn select(current(0, 64)) {\n'
out += '\t\t0 : parse_out_header;\n'
out += '\t\tdefault: parse_'+self.root_layer+';\n'
out += '\t}\n'
out += '}\n\n'
return out
def get_raw_parser_code(self):
raw_layers = self.get_raw_layers()
out = ""
for layer in raw_layers:
p4_layer = get_p4_layer(layer)
out += p4_layer.get_header_specification_code()
out += p4_layer.get_parser_code(raw_layers)
return out
def get_raw_layers(self):
raw_fields = set()
for qid in self.queries:
# all_fields.union(set(operator.get_init_keys()))
raw_fields = raw_fields.union(self.queries[qid].all_fields)
# TODO: get rid of this local fix. This won't be required after we fix the sonata query module
# Start local fix
raw_fields = [x for x in raw_fields]
# End local fix
raw_layers = self.p4_raw_fields.get_layers_for_fields(raw_fields)
return raw_layers
def get_out_header_parser(self):
# This needs to be called from the header class itself
out = ''
out += 'parser parse_out_header {\n'
for query in self.queries.values():
out += '\textract(%s);\n' % query.out_header.get_name()
out += '\t%s\n' % self.final_header.get_parser_code()
out += '\treturn parse_ethernet;\n'
out += '}\n\n'
return out
def get_app_code(self):
out = ''
out += self.init_action.get_code()
out += self.init_action_table.get_code()
out += self.metadata.get_code()
out += self.nop_action.get_code()
out += self.field_list.get_code()
out += self.report_action.get_code()
out += self.report_action_table.get_code()
out += self.final_header.get_header_specification_code()
out += self.final_header_action.get_code()
out += self.final_header_table.get_code()
return out
def get_code(self):
out = ''
for query in self.queries.values():
out += query.get_code()
return out
def get_original_repeat_code(self):
original_repeat = """
action _drop() {
drop();
}
action repeat(dport) {
modify_field(standard_metadata.egress_spec, dport);
}
table forward {
reads {
standard_metadata.ingress_port: exact;
}
actions {
repeat;
_drop;
}
size: 2;
}\n"""
return original_repeat
def get_ingress_pipeline(self):
out = ''
out += 'control ingress {\n'
out += '\tapply(%s);\n' % self.init_action_table.get_name()
# add the control flow of one query after the other
for query in self.queries.values():
out += query.get_ingress_control_flow(2)
out += '\n'
# after processing all queries, determine whether the packet should be sent to the emitter as it satisfied at
# least one query
out += '\tif (%s.%s == 1) {\n' % (self.metadata.get_name(), self.clone_meta_field)
out += '\t\tapply(%s);\n' % self.report_action_table.get_name()
out += '\t}\n'
if ORIGINAL_PACKET: out += '\tapply(forward);\n'
out += '}\n\n'
return out
def get_egress_pipeline(self):
out = ''
out += 'control egress {\n'
# normal forwarding of the original packet
out += '\tif (standard_metadata.instance_type == 0) {\n'
out += '\t\t// original packet, apply forwarding\n'
out += '\t}\n\n'
# adding header to the report packet which is sent to the emitter
out += '\telse if (standard_metadata.instance_type == 1) {\n'
for query in self.queries.values():
out += query.get_egress_control_flow(2)
out += '\t\tapply(%s);\n' % self.final_header_table.get_name()
out += '\t}\n'
out += '}\n\n'
return out
def get_commands(self):
commands = list()
for query in self.queries.values():
commands += query.get_commands()
commands.append(self.report_action_table.get_default_command())
commands.append(self.final_header_table.get_default_command())
commands.append(self.mirror_session.get_command())
if ORIGINAL_PACKET:
commands.append("table_set_default forward _drop")
commands.append("table_add forward repeat %s => %s" % (SENDER_PORT, RECIEVE_PORT))
commands.append("table_add forward repeat %s => %s" % (RECIEVE_PORT, SENDER_PORT))
return commands
# def get_header_format(self):
# header_format = dict()
# header_format['parse_payload'] = self.parse_payload
# header_format['headers'] = self.out_header_fields
# return header_format
def get_header_formats(self):
# This needs updates as we now change the logic of packet parsing at the emitter
header_formats = dict()
for qid, query in self.queries.iteritems():
header_formats[qid] = query.get_header_format()
return header_formats
def get_update_commands(self, filter_update):
commands = list()
for qid, filter_id in filter_update:
commands.extend(self.queries[qid].get_update_commands(filter_id, filter_update[(qid, filter_id)]))
return commands
def add_general_drop_action(self):
self.actions['drop'] = Action('drop_%i' % self.id,
(ModifyField(self.drop_meta_field, 1)))
self.query_drop_action = self.actions['drop'].get_name()
def __init__(self, qid, operator_id, meta_init_name, drop_action,
nop_action, keys, p4_raw_fields):
super(P4Distinct, self).__init__('Distinct', qid, operator_id, keys,
p4_raw_fields)
self.threshold = 0
self.comp_func = '<=' # bitwise and
self.update_func = '&' # bitwise and
# create METADATA to store index and value
fields = [('value', REGISTER_WIDTH),
('index', REGISTER_NUM_INDEX_BITS)]
self.metadata = MetaData(self.operator_name, fields)
# create REGISTER to keep track of counts
self.register = Register(self.operator_name, REGISTER_WIDTH,
REGISTER_INSTANCE_COUNT)
# Add map init
hash_init_fields = list()
for fld in self.keys:
if fld == 'qid':
hash_init_fields.append(
P4Field(layer=None,
target_name="qid",
sonata_name="qid",
size=QID_SIZE))
elif fld == 'count':
hash_init_fields.append(
P4Field(layer=None,
target_name="count",
sonata_name="count",
size=COUNT_SIZE))
else:
hash_init_fields.append(
self.p4_raw_fields.get_target_field(fld))
# create HASH for access to register
hash_fields = list()
for field in hash_init_fields:
if '/' in field.sonata_name:
self.logger.error('found a / in the key')
raise NotImplementedError
else:
hash_fields.append(
'%s.%s' %
(meta_init_name, field.target_name.replace(".", "_")))
self.hash = HashFields(self.operator_name, hash_fields, 'crc16',
REGISTER_NUM_INDEX_BITS)
# name of metadata field where the index of the count within the register is stored
self.index_field_name = '%s.index' % self.metadata.get_name()
# name of metadata field where the count is kept temporarily
self.value_field_name = '%s.value' % self.metadata.get_name()
# create ACTION and TABLE to compute hash and get value
primitives1 = list()
primitives1.append(
ModifyFieldWithHashBasedOffset(self.index_field_name, 0,
self.hash.get_name(),
REGISTER_INSTANCE_COUNT))
primitives1.append(
RegisterRead(self.value_field_name, self.register.get_name(),
self.index_field_name))
self.action1 = Action('do_init_%s' % self.operator_name, primitives1)
# create ACTION and TABLE to bit_or value & write back
primitives2 = list()
primitives2.append(
BitOr(self.value_field_name, self.value_field_name, 1))
primitives2.append(
RegisterWrite(self.register.get_name(), self.index_field_name,
self.value_field_name))
self.action2 = Action('do_update_%s' % self.operator_name, primitives2)
table_name = 'init_%s' % self.operator_name
self.init_table = Table(table_name, self.action1.get_name(), [], None,
1)
table_name = 'update_%s' % self.operator_name
self.update_table = Table(table_name, self.action2.get_name(), [],
None, 1)
# create two TABLEs that implement reduce operation: if count <= THRESHOLD, update count and drop, else let it
# pass through
table_name = 'pass_%s' % self.operator_name
self.pass_table = Table(table_name, nop_action, [], None, 1)
table_name = 'drop_%s' % self.operator_name
self.drop_table = Table(table_name, drop_action, [], None, 1)
class P4MapInit(P4Operator):
def __init__(self, qid, operator_id, keys, p4_raw_fields):
super(P4MapInit, self).__init__('MapInit', qid, operator_id, keys,
p4_raw_fields)
# Add map init
map_init_fields = list()
for fld in self.keys:
if fld == 'qid':
map_init_fields.append(
P4Field(layer=None,
target_name="qid",
sonata_name="qid",
size=QID_SIZE))
elif fld == 'count':
map_init_fields.append(
P4Field(layer=None,
target_name="count",
sonata_name="count",
size=COUNT_SIZE))
elif fld == 'index':
map_init_fields.append(
P4Field(layer=None,
target_name="index",
sonata_name="index",
size=INDEX_SIZE))
else:
map_init_fields.append(
self.p4_raw_fields.get_target_field(fld))
# create METADATA object to store data for all keys
meta_fields = list()
for fld in map_init_fields:
meta_fields.append((fld.target_name.replace(".", "_"), fld.size))
self.metadata = MetaData(self.operator_name, meta_fields)
# create ACTION to initialize the metadata
primitives = list()
for fld in map_init_fields:
sonata_name = fld.sonata_name
target_name = fld.target_name
meta_field_name = '%s.%s' % (self.metadata.get_name(),
target_name.replace(".", "_"))
if sonata_name == 'qid':
# Assign query id to this field
primitives.append(ModifyField(meta_field_name, qid))
elif sonata_name == 'count':
primitives.append(ModifyField(meta_field_name, 0))
elif sonata_name == 'index':
primitives.append(ModifyField(meta_field_name, 0))
else:
# Read data from raw header fields and assign them to these meta fields
primitives.append(ModifyField(meta_field_name, target_name))
self.action = Action('do_%s' % self.operator_name, primitives)
# create dummy TABLE to execute the action
self.table = Table(self.operator_name, self.action.get_name(), [],
None, 1)
def __repr__(self):
return '.MapInit(keys=' + str(self.keys) + ')'
def get_meta_name(self):
return self.metadata.get_name()
def get_code(self):
out = ''
out += '// MapInit of query %i\n' % self.query_id
out += self.metadata.get_code()
out += self.action.get_code()
out += self.table.get_code()
out += '\n'
return out
def get_commands(self):
commands = list()
commands.append(self.table.get_default_command())
return commands
def get_control_flow(self, indent_level):
indent = '\t' * indent_level
out = ''
out += '%sapply(%s);\n' % (indent, self.table.get_name())
return out
def get_init_keys(self):
return self.keys
def __init__(self, qid, operator_id, meta_init_name, drop_action, keys,
values, threshold, read_register, p4_raw_fields):
super(P4Reduce, self).__init__('Reduce', qid, operator_id, keys,
p4_raw_fields)
if threshold == '-1':
self.threshold = int(THRESHOLD)
else:
self.threshold = int(threshold)
self.read_register = read_register
if self.read_register:
self.out_headers += ['index']
else:
self.out_headers += ['count']
# create METADATA to store index and value
fields = [('value', REGISTER_WIDTH),
('index', REGISTER_NUM_INDEX_BITS)]
self.metadata = MetaData(self.operator_name, fields)
# create REGISTER to keep track of counts
self.register = Register(self.operator_name, REGISTER_WIDTH,
REGISTER_INSTANCE_COUNT)
self.values = values
# Add map init
hash_init_fields = list()
for fld in self.keys:
if fld == 'qid':
hash_init_fields.append(
P4Field(layer=None,
target_name="qid",
sonata_name="qid",
size=QID_SIZE))
elif fld == 'count':
hash_init_fields.append(
P4Field(layer=None,
target_name="count",
sonata_name="count",
size=COUNT_SIZE))
elif fld == 'index':
hash_init_fields.append(
P4Field(layer=None,
target_name="index",
sonata_name="index",
size=INDEX_SIZE))
else:
hash_init_fields.append(
self.p4_raw_fields.get_target_field(fld))
# create HASH for access to register
hash_fields = list()
for field in hash_init_fields:
if '/' in field.sonata_name:
self.logger.error('found a / in the key')
raise NotImplementedError
else:
hash_fields.append(
'%s.%s' %
(meta_init_name, field.target_name.replace(".", "_")))
self.hash = HashFields(self.operator_name, hash_fields, 'crc16',
REGISTER_NUM_INDEX_BITS)
# name of metadata field where the index of the count within the register is stored
self.index_field_name = '%s.index' % self.metadata.get_name()
# name of metadata field where the count is kept temporarily
self.value_field_name = '%s.value' % self.metadata.get_name()
# create ACTION and TABLE to compute hash and get value
primitives = list()
primitives.append(
ModifyFieldWithHashBasedOffset(self.index_field_name, 0,
self.hash.get_name(),
REGISTER_INSTANCE_COUNT))
primitives.append(
RegisterRead(self.value_field_name, self.register.get_name(),
self.index_field_name))
if self.values[0] == 'count':
if self.threshold <= 1:
self.threshold = '1'
primitives.append(
ModifyField(self.value_field_name,
'%s + %i' % (self.value_field_name, 1)))
else:
target_fld = self.p4_raw_fields.get_target_field(self.values[0])
if self.threshold <= 1:
self.threshold = '%s.%s' % (
meta_init_name, target_fld.target_name.replace(".", "_"))
primitives.append(
ModifyField(
self.value_field_name,
'%s + %s' % (self.value_field_name, '%s.%s' %
(meta_init_name,
target_fld.target_name.replace(".", "_")))))
primitives.append(
RegisterWrite(self.register.get_name(), self.index_field_name,
self.value_field_name))
self.init_action = Action('do_init_%s' % self.operator_name,
primitives)
table_name = 'init_%s' % self.operator_name
self.init_table = Table(table_name, self.init_action.get_name(), [],
None, 1)
# create three TABLEs that implement reduce operation
# if count <= THRESHOLD, update count and drop,
table_name = 'drop_%s' % self.operator_name
self.drop_table = Table(table_name, drop_action, [], None, 1)
# if count == THRESHOLD, pass through with current count
field_to_modified = None
if not self.read_register:
field_to_modified = ModifyField('%s.count' % meta_init_name,
self.value_field_name)
else:
field_to_modified = ModifyField('%s.index' % meta_init_name,
self.index_field_name)
self.set_count_action = Action('set_count_%s' % self.operator_name,
field_to_modified)
table_name = 'first_pass_%s' % self.operator_name
self.first_pass_table = Table(table_name,
self.set_count_action.get_name(), [],
None, 1)
if not self.read_register:
# if count > THRESHOLD, let it pass through with count set to 1
self.reset_count_action = Action(
'reset_count_%s' % self.operator_name,
ModifyField('%s.count' % meta_init_name, 1))
table_name = 'pass_%s' % self.operator_name
self.pass_table = Table(table_name,
self.reset_count_action.get_name(), [],
None, 1)
