def get_class_parameters(kwarg):
ret = {'attrs': []}
for key in ('rsc', 'fsc', 'usc'):
if key in kwarg:
ret['attrs'].append([
'TCA_HFSC_%s' % key.upper(), {
'm1': get_rate(kwarg[key].get('m1', 0)),
'd': get_time(kwarg[key].get('d', 0)),
'm2': get_rate(kwarg[key].get('m2', 0))
}
])
return ret
def get_class_parameters(kwarg):
prio = kwarg.get('prio', 0)
mtu = kwarg.get('mtu', 1600)
mpu = kwarg.get('mpu', 0)
overhead = kwarg.get('overhead', 0)
quantum = kwarg.get('quantum', 0)
rate = get_rate(kwarg.get('rate', None))
ceil = get_rate(kwarg.get('ceil', 0)) or rate
burst = (
kwarg.get('burst', None)
or kwarg.get('maxburst', None)
or kwarg.get('buffer', None)
)
if rate is not None:
if burst is None:
burst = rate / get_hz() + mtu
burst = calc_xmittime(rate, burst)
cburst = (
kwarg.get('cburst', None)
or kwarg.get('cmaxburst', None)
or kwarg.get('cbuffer', None)
)
if ceil is not None:
if cburst is None:
cburst = ceil / get_hz() + mtu
cburst = calc_xmittime(ceil, cburst)
return {
'attrs': [
[
'TCA_HTB_PARMS',
{
'buffer': burst,
'cbuffer': cburst,
'quantum': quantum,
'prio': prio,
'rate': rate,
'ceil': ceil,
'ceil_overhead': overhead,
'rate_overhead': overhead,
'rate_mpu': mpu,
'ceil_mpu': mpu,
},
],
['TCA_HTB_RTAB', True],
['TCA_HTB_CTAB', True],
]
}
def get_parameters(kwarg):
# The code is ported from iproute2
avpkt = 1000
probability = 0.02
opt = {
'limit': kwarg['limit'], # required
'qth_min': kwarg.get('min', 0),
'qth_max': kwarg.get('max', 0),
'Wlog': 0,
'Plog': 0,
'Scell_log': 0,
'flags': 1 if kwarg.get('ecn') else 0,
}
rate = get_rate(kwarg['bandwith']) # required
burst = kwarg.get('burst', 0)
avpkt = get_size(kwarg.get('avpkt', 1000))
probability = kwarg.get('probability', 0.02)
if not opt['qth_max']:
opt['qth_max'] = opt['limit'] // 4
if not opt['qth_min']:
opt['qth_min'] = opt['qth_max'] // 3
if not burst:
burst = (2 * opt['qth_min'] + opt['qth_max']) // 3
if opt['qth_max'] > opt['limit']:
raise Exception('max is larger than limit')
if opt['qth_min'] >= opt['qth_max']:
raise Exception('min is not smaller than max')
# Wlog
opt['Wlog'] = red_eval_ewma(opt['qth_min'] * avpkt, burst, avpkt)
if opt['Wlog'] < 0:
raise Exception('failed to calculate EWMA')
elif opt['Wlog'] > 10:
log.warning('choke: burst %s seems to be too large' % burst)
# Plog
opt['Plog'] = red_eval_P(opt['qth_min'] * avpkt, opt['qth_max'] * avpkt,
probability)
if opt['Plog'] < 0:
raise Exception('choke: failed to calculate probability')
# Scell_log, stab
opt['Scell_log'], stab = red_eval_idle_damping(opt['Wlog'], avpkt, rate)
if opt['Scell_log'] < 0:
raise Exception('choke: failed to calculate idle damping table')
return {
'attrs': [
['TCA_CHOKE_PARMS', opt],
['TCA_CHOKE_STAB', stab],
['TCA_CHOKE_MAX_P',
int(probability * pow(2, 32))],
]
}
def get_parameters(kwarg):
delay = time2tick(kwarg.get('delay', 0)) # in microsecond
limit = kwarg.get('limit', 1000) # fifo limit (packets) see netem.c:230
loss = percent2u32(kwarg.get('loss', 0)) # int percentage
gap = kwarg.get('gap', 0)
duplicate = kwarg.get('duplicate', 0)
jitter = time2tick(kwarg.get('jitter', 0)) # in microsecond
opts = {
'delay': delay,
'limit': limit,
'loss': loss,
'gap': gap,
'duplicate': duplicate,
'jitter': jitter,
'attrs': [],
}
# correlation (delay, loss, duplicate)
delay_corr = percent2u32(kwarg.get('delay_corr', 0))
loss_corr = percent2u32(kwarg.get('loss_corr', 0))
dup_corr = percent2u32(kwarg.get('dup_corr', 0))
if delay_corr or loss_corr or dup_corr:
# delay_corr requires that both jitter and delay are != 0
if delay_corr and not (delay and jitter):
raise Exception(
'delay correlation requires delay' ' and jitter to be set'
)
# loss correlation and loss
if loss_corr and not loss:
raise Exception('loss correlation requires loss to be set')
# duplicate correlation and duplicate
if dup_corr and not duplicate:
raise Exception(
'duplicate correlation requires ' 'duplicate to be set'
)
opts['attrs'].append(
[
'TCA_NETEM_CORR',
{
'delay_corr': delay_corr,
'loss_corr': loss_corr,
'dup_corr': dup_corr,
},
]
)
# reorder (probability, correlation)
prob_reorder = percent2u32(kwarg.get('prob_reorder', 0))
corr_reorder = percent2u32(kwarg.get('corr_reorder', 0))
if prob_reorder != 0:
# gap defaults to 1 if equal to 0
if gap == 0:
opts['gap'] = gap = 1
opts['attrs'].append(
[
'TCA_NETEM_REORDER',
{'prob_reorder': prob_reorder, 'corr_reorder': corr_reorder},
]
)
else:
if gap != 0:
raise Exception('gap can only be set when prob_reorder is set')
elif corr_reorder != 0:
raise Exception(
'corr_reorder can only be set when ' 'prob_reorder is set'
)
# corrupt (probability, correlation)
prob_corrupt = percent2u32(kwarg.get('prob_corrupt', 0))
corr_corrupt = percent2u32(kwarg.get('corr_corrupt', 0))
if prob_corrupt:
opts['attrs'].append(
[
'TCA_NETEM_CORRUPT',
{'prob_corrupt': prob_corrupt, 'corr_corrupt': corr_corrupt},
]
)
elif corr_corrupt != 0:
raise Exception(
'corr_corrupt can only be set when ' 'prob_corrupt is set'
)
# rate (rate, packet_overhead, cell_size, cell_overhead)
rate = get_rate(kwarg.get('rate', None))
packet_overhead = kwarg.get('packet_overhead', 0)
cell_size = kwarg.get('cell_size', 0)
cell_overhead = kwarg.get('cell_overhead', 0)
if rate is not None:
opts['attrs'].append(
[
'TCA_NETEM_RATE',
{
'rate': rate,
'packet_overhead': packet_overhead,
'cell_size': cell_size,
'cell_overhead': cell_overhead,
},
]
)
elif packet_overhead != 0 or cell_size != 0 or cell_overhead != 0:
raise Exception(
'packet_overhead, cell_size and cell_overhead'
'can only be set when rate is set'
)
# TODO
# delay distribution (dist_size, dist_data)
return opts