def loop(self):
""" Periodic job. """
# otherwise apply the SDN@Play algorithm
for block in self.blocks():
for addr, entry in self.mcast_services.items():
# fetch txp
if addr not in block.tx_policies:
block.tx_policies[addr] = TxPolicy(addr, block)
txp = block.tx_policies[addr]
if self.mcast_policy == TX_MCAST_DMS_H:
txp.mcast = TX_MCAST_DMS
continue
if self.mcast_policy == TX_MCAST_LEGACY_H:
txp.mcast = TX_MCAST_LEGACY
continue
phase = self.get_next_group_phase(addr)
self.log.info("Mcast phase %s for group %s", TX_MCAST[phase],
addr)
# If the service is disabled, DMS must be the multicast mode
if entry["status"] is False:
txp.mcast = TX_MCAST_DMS
continue
if phase == TX_MCAST_DMS:
txp.mcast = TX_MCAST_DMS
else:
# compute MCS
temp_mcs = self.calculate_group_mcs(entry["receivers"])
if block.band == BT_HT20:
mcs = max(temp_mcs, min(block.ht_supports))
else:
mcs = max(temp_mcs, min(block.supports))
entry['mcs'] = mcs
txp.mcast = TX_MCAST_LEGACY
if block.band == BT_HT20:
txp.ht_mcs = [mcs]
else:
txp.mcs = [mcs]
# assign MCS
self.log.info("Block %s setting mcast %s to %s MCS %d",
block, addr, TX_MCAST[TX_MCAST_DMS], mcs)
def _handle_tx_policy_status_response(self, status):
"""Handle an incoming TX_POLICY_STATUS_RESPONSE message."""
block = self.device.blocks[status.iface_id]
addr = EtherAddress(status.sta)
if addr not in block.tx_policies:
block.tx_policies[addr] = TxPolicy(addr, block)
txp = block.tx_policies[addr]
txp.set_mcs([float(x) / 2 for x in status.mcs])
txp.set_ht_mcs([int(x) for x in status.mcs_ht])
txp.set_rts_cts(status.rts_cts)
txp.set_max_amsdu_len(status.max_amsdu_len)
txp.set_mcast(status.tx_mcast)
txp.set_no_ack(status.flags.no_ack)
self.log.info("TX policy status: %s", txp)
def __assign_downlink(self, dl_block):
"""Set the downlink block."""
# assign default tx policy to the downlink resource block
txp = TxPolicy(self.addr, dl_block)
# standard MCS (channel above 14 are the 11a modulations)
if dl_block.channel > 14:
txp.set_mcs([6.0, 9.0, 12.0, 18.0, 24.0, 36.0, 48.0, 54.0])
else:
txp.set_mcs([1.0, 2.0, 5.5, 11.0,
6.0, 9.0, 12.0, 18.0, 24.0, 36.0, 48.0, 54.0])
# assign the HT MCS
if self.ht_caps:
txp.set_ht_mcs([0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15])
else:
txp.set_ht_mcs([])
# assign the max AMSDU len
if self.ht_caps and self.ht_caps_info['Maximum_AMSDU_Length']:
txp.set_max_amsdu_len(TX_AMSDU_LEN_8K)
elif self.ht_caps and not self.ht_caps_info['Maximum_AMSDU_Length']:
txp.set_max_amsdu_len(TX_AMSDU_LEN_8K)
else:
txp.set_max_amsdu_len(0)
# set tx policy
dl_block.tx_policies[self.addr] = txp
# send the message to set the tx policy
dl_block.wtp.connection.send_set_tx_policy(txp)
# send add_lvap message
xid = \
dl_block.wtp.connection.send_add_lvap_request(self, dl_block, True)
self.pending.append(xid)
# save block
self._downlink = dl_block