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pre.py
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# Copyright 2021 Intel-KAUST-Microsoft
#
# 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 logging
from control import Control
from bfrt_grpc.bfruntime_pb2 import TableModIncFlag
class PRE(Control):
def __init__(self, target, gc, bfrt_info):
# Set up base class
super(PRE, self).__init__(target, gc)
self.log = logging.getLogger(__name__)
self.tables = [
bfrt_info.table_get('$pre.mgid'),
bfrt_info.table_get('$pre.node'),
bfrt_info.table_get('$pre.ecmp'),
bfrt_info.table_get('$pre.lag'),
bfrt_info.table_get('$pre.prune'),
bfrt_info.table_get('$pre.port')
]
self.multicast_group = self.tables[0]
self.node = self.tables[1]
self.port = self.tables[5]
# Clear tables and add defaults
self._clear()
def _clear(self):
''' Remove all existing multicast groups and nodes '''
resp = self.multicast_group.entry_get(self.target,
flags={'from_hw': False})
for _, k in resp:
self.multicast_group.entry_del(self.target, [k])
resp = self.node.entry_get(self.target, flags={'from_hw': False})
for _, k in resp:
self.node.entry_del(self.target, [k])
def add_multicast_group(self, mgid):
''' Add an empty multicast group.
Keyword arguments:
mgid -- multicast group ID
'''
self.multicast_group.entry_add(
self.target,
[self.multicast_group.make_key([self.gc.KeyTuple('$MGID', mgid)])],
[
self.multicast_group.make_data([
self.gc.DataTuple('$MULTICAST_NODE_ID', int_arr_val=[]),
self.gc.DataTuple('$MULTICAST_NODE_L1_XID_VALID',
bool_arr_val=[]),
self.gc.DataTuple('$MULTICAST_NODE_L1_XID', int_arr_val=[])
])
])
def add_multicast_node(self, mgid, rid, port):
''' Create a multicast node and add it to a multicast group.
Keyword arguments:
mgid -- multicast group ID
rid -- node ID
port -- device port for the node
Returns:
(success flag, None or error message)
'''
# Check if multicast group exists
resp = self.multicast_group.entry_get(self.target,
flags={'from_hw': False})
found = False
for _, k in resp:
if mgid == k.to_dict()['$MGID']['value']:
found = True
if not found:
error_msg = 'Multicast group {} not present'.format(mgid)
self.log.error(error_msg)
return (False, error_msg)
# Check if a node with the same ID exists
resp = self.node.entry_get(self.target, flags={'from_hw': False})
for _, k in resp:
if k.to_dict()['$MULTICAST_NODE_ID']['value'] == rid:
error_msg = 'Multicast node {} already present'.format(rid)
self.log.error(error_msg)
return (False, error_msg)
# Add node
self.node.entry_add(
self.target,
[self.node.make_key([self.gc.KeyTuple('$MULTICAST_NODE_ID', rid)])],
[
self.node.make_data([
self.gc.DataTuple('$MULTICAST_RID', rid),
self.gc.DataTuple('$DEV_PORT', int_arr_val=[port])
])
])
# Extend multicast group
self.multicast_group.entry_mod_inc(self.target, [
self.multicast_group.make_key([self.gc.KeyTuple('$MGID', mgid)])
], [
self.multicast_group.make_data([
self.gc.DataTuple('$MULTICAST_NODE_ID', int_arr_val=[rid]),
self.gc.DataTuple('$MULTICAST_NODE_L1_XID_VALID',
bool_arr_val=[True]),
self.gc.DataTuple('$MULTICAST_NODE_L1_XID', int_arr_val=[rid])
])
], TableModIncFlag.MOD_INC_ADD)
return (True, None)
def add_multicast_nodes(self, mgid, rids_and_ports):
''' Create multiple multicast nodes and add them to one multicast group.
Keyword arguments:
mgid -- multicast group ID
rids_and_ports -- list of tuples (node ID, device port)
Returns:
(success flag, None or error message)
'''
for rid, port in rids_and_ports:
success, error_msg = self.add_multicast_node(mgid, rid, port)
if not success:
return (False, error_msg)
return (True, None)
def remove_multicast_node(self, rid):
''' Remove multicast node with given ID '''
resp = self.multicast_group.entry_get(self.target,
flags={'from_hw': False})
# If the node is in any group
for v, k in resp:
if rid in v.to_dict()['$MULTICAST_NODE_ID']:
# Remove group entry
self.multicast_group.entry_mod_inc(
self.target, [k], [
self.multicast_group.make_data([
self.gc.DataTuple('$MULTICAST_NODE_ID',
int_arr_val=[rid]),
self.gc.DataTuple('$MULTICAST_NODE_L1_XID_VALID',
bool_arr_val=[False]),
self.gc.DataTuple('$MULTICAST_NODE_L1_XID',
int_arr_val=[0])
])
], TableModIncFlag.MOD_INC_DELETE)
# Remove node entry
self.node.entry_del(
self.target,
[self.node.make_key([self.gc.KeyTuple('$MULTICAST_NODE_ID', rid)])])
def remove_multicast_group(self, mgid):
''' Remove multicast group with given ID '''
self.multicast_group.entry_del(
self.target,
[self.multicast_group.make_key([self.gc.KeyTuple('$MGID', mgid)])])