def linkconfig(
self,
netif: CoreInterface,
bw: float = None,
delay: float = None,
loss: float = None,
duplicate: float = None,
jitter: float = None,
netif2: float = None,
devname: str = None,
) -> None:
"""
Configure link parameters by applying tc queuing disciplines on the interface.
:param netif: interface one
:param bw: bandwidth to set to
:param delay: packet delay to set to
:param loss: packet loss to set to
:param duplicate: duplicate percentage to set to
:param jitter: jitter to set to
:param netif2: interface two
:param devname: device name
:return: nothing
"""
if devname is None:
devname = netif.localname
tc = f"{TC_BIN} qdisc replace dev {devname}"
parent = "root"
changed = False
if netif.setparam("bw", bw):
# from tc-tbf(8): minimum value for burst is rate / kernel_hz
if bw is not None:
burst = max(2 * netif.mtu, bw / 1000)
# max IP payload
limit = 0xFFFF
tbf = f"tbf rate {bw} burst {burst} limit {limit}"
if bw > 0:
if self.up:
cmd = f"{tc} {parent} handle 1: {tbf}"
netif.host_cmd(cmd)
netif.setparam("has_tbf", True)
changed = True
elif netif.getparam("has_tbf") and bw <= 0:
if self.up:
cmd = f"{TC_BIN} qdisc delete dev {devname} {parent}"
netif.host_cmd(cmd)
netif.setparam("has_tbf", False)
# removing the parent removes the child
netif.setparam("has_netem", False)
changed = True
if netif.getparam("has_tbf"):
parent = "parent 1:1"
netem = "netem"
changed = max(changed, netif.setparam("delay", delay))
if loss is not None:
loss = float(loss)
changed = max(changed, netif.setparam("loss", loss))
if duplicate is not None:
duplicate = int(duplicate)
changed = max(changed, netif.setparam("duplicate", duplicate))
changed = max(changed, netif.setparam("jitter", jitter))
if not changed:
return
# jitter and delay use the same delay statement
if delay is not None:
netem += f" delay {delay}us"
if jitter is not None:
if delay is None:
netem += f" delay 0us {jitter}us 25%"
else:
netem += f" {jitter}us 25%"
if loss is not None and loss > 0:
netem += f" loss {min(loss, 100)}%"
if duplicate is not None and duplicate > 0:
netem += f" duplicate {min(duplicate, 100)}%"
delay_check = delay is None or delay <= 0
jitter_check = jitter is None or jitter <= 0
loss_check = loss is None or loss <= 0
duplicate_check = duplicate is None or duplicate <= 0
if all([delay_check, jitter_check, loss_check, duplicate_check]):
# possibly remove netem if it exists and parent queue wasn't removed
if not netif.getparam("has_netem"):
return
if self.up:
cmd = f"{TC_BIN} qdisc delete dev {devname} {parent} handle 10:"
netif.host_cmd(cmd)
netif.setparam("has_netem", False)
elif len(netem) > 1:
if self.up:
cmd = (
f"{TC_BIN} qdisc replace dev {devname} {parent} handle 10: {netem}"
)
netif.host_cmd(cmd)
netif.setparam("has_netem", True)
def linkconfig(self,
iface: CoreInterface,
options: LinkOptions,
iface2: CoreInterface = None) -> None:
"""
Configure link parameters by applying tc queuing disciplines on the interface.
:param iface: interface one
:param options: options for configuring link
:param iface2: interface two
:return: nothing
"""
# determine if any settings have changed
changed = any([
iface.setparam("bw", options.bandwidth),
iface.setparam("delay", options.delay),
iface.setparam("loss", options.loss),
iface.setparam("duplicate", options.dup),
iface.setparam("jitter", options.jitter),
iface.setparam("buffer", options.buffer),
])
if not changed:
return
# delete tc configuration or create and add it
devname = iface.localname
if all([
options.delay is None or options.delay <= 0,
options.jitter is None or options.jitter <= 0,
options.loss is None or options.loss <= 0,
options.dup is None or options.dup <= 0,
options.bandwidth is None or options.bandwidth <= 0,
options.buffer is None or options.buffer <= 0,
]):
if not iface.getparam("has_netem"):
return
if self.up:
cmd = f"{TC} qdisc delete dev {devname} root handle 10:"
iface.host_cmd(cmd)
iface.setparam("has_netem", False)
else:
netem = ""
if options.bandwidth is not None:
limit = 1000
bw = options.bandwidth / 1000
if options.buffer is not None and options.buffer > 0:
limit = options.buffer
elif options.delay and options.bandwidth:
delay = options.delay / 1000
limit = max(2, math.ceil(
(2 * bw * delay) / (8 * iface.mtu)))
netem += f" rate {bw}kbit"
netem += f" limit {limit}"
if options.delay is not None:
netem += f" delay {options.delay}us"
if options.jitter is not None:
if options.delay is None:
netem += f" delay 0us {options.jitter}us 25%"
else:
netem += f" {options.jitter}us 25%"
if options.loss is not None and options.loss > 0:
netem += f" loss {min(options.loss, 100)}%"
if options.dup is not None and options.dup > 0:
netem += f" duplicate {min(options.dup, 100)}%"
if self.up:
cmd = f"{TC} qdisc replace dev {devname} root handle 10: netem {netem}"
iface.host_cmd(cmd)
iface.setparam("has_netem", True)
def linkconfig(self,
iface: CoreInterface,
options: LinkOptions,
iface2: CoreInterface = None) -> None:
"""
Configure link parameters by applying tc queuing disciplines on the interface.
:param iface: interface one
:param options: options for configuring link
:param iface2: interface two
:return: nothing
"""
devname = iface.localname
tc = f"{TC} qdisc replace dev {devname}"
parent = "root"
changed = False
bw = options.bandwidth
if iface.setparam("bw", bw):
# from tc-tbf(8): minimum value for burst is rate / kernel_hz
burst = max(2 * iface.mtu, int(bw / 1000))
# max IP payload
limit = 0xFFFF
tbf = f"tbf rate {bw} burst {burst} limit {limit}"
if bw > 0:
if self.up:
cmd = f"{tc} {parent} handle 1: {tbf}"
iface.host_cmd(cmd)
iface.setparam("has_tbf", True)
changed = True
elif iface.getparam("has_tbf") and bw <= 0:
if self.up:
cmd = f"{TC} qdisc delete dev {devname} {parent}"
iface.host_cmd(cmd)
iface.setparam("has_tbf", False)
# removing the parent removes the child
iface.setparam("has_netem", False)
changed = True
if iface.getparam("has_tbf"):
parent = "parent 1:1"
netem = "netem"
delay = options.delay
changed = max(changed, iface.setparam("delay", delay))
loss = options.loss
if loss is not None:
loss = float(loss)
changed = max(changed, iface.setparam("loss", loss))
duplicate = options.dup
if duplicate is not None:
duplicate = int(duplicate)
changed = max(changed, iface.setparam("duplicate", duplicate))
jitter = options.jitter
changed = max(changed, iface.setparam("jitter", jitter))
if not changed:
return
# jitter and delay use the same delay statement
if delay is not None:
netem += f" delay {delay}us"
if jitter is not None:
if delay is None:
netem += f" delay 0us {jitter}us 25%"
else:
netem += f" {jitter}us 25%"
if loss is not None and loss > 0:
netem += f" loss {min(loss, 100)}%"
if duplicate is not None and duplicate > 0:
netem += f" duplicate {min(duplicate, 100)}%"
delay_check = delay is None or delay <= 0
jitter_check = jitter is None or jitter <= 0
loss_check = loss is None or loss <= 0
duplicate_check = duplicate is None or duplicate <= 0
if all([delay_check, jitter_check, loss_check, duplicate_check]):
# possibly remove netem if it exists and parent queue wasn't removed
if not iface.getparam("has_netem"):
return
if self.up:
cmd = f"{TC} qdisc delete dev {devname} {parent} handle 10:"
iface.host_cmd(cmd)
iface.setparam("has_netem", False)
elif len(netem) > 1:
if self.up:
cmd = f"{TC} qdisc replace dev {devname} {parent} handle 10: {netem}"
iface.host_cmd(cmd)
iface.setparam("has_netem", True)
