* [PATCH net-next v2 1/3] selftests: drv-net: Introduce a selftest for ethtool flow control
2026-09-25 18:26 [PATCH net-next v2 0/3] selftests: drv-net: Introduce flow-control selftest Maxime Chevallier (Netdev Foundation)
@ 2026-09-25 18:26 ` Maxime Chevallier (Netdev Foundation)
2026-09-25 18:26 ` [PATCH net-next v2 2/3] selftests: drv-net: pause: Validate the pause autonegotiation with a partner Maxime Chevallier (Netdev Foundation)
2026-09-25 18:26 ` [PATCH net-next v2 3/3] selftests: drv-net: pause: Validate pause autoneg interactions with link autoneg Maxime Chevallier (Netdev Foundation)
2 siblings, 0 replies; 4+ messages in thread
From: Maxime Chevallier (Netdev Foundation) @ 2026-09-25 18:26 UTC (permalink / raw)
To: Andrew Lunn, Jakub Kicinski, davem, Eric Dumazet, Paolo Abeni,
Simon Horman, Russell King, Heiner Kallweit, Jonathan Corbet,
Shuah Khan
Cc: Maxime Chevallier (Netdev Foundation),
Oleksij Rempel, Vladimir Oltean, Florian Fainelli,
thomas.petazzoni, netdev, linux-kernel, linux-doc
Ethernet flow control is a tricky thing to get right, especially when it
comes to correctly handling the negotiation of the parameters with a
link partner.
On one hand, the userspace API talks in terms of the device's ability to
send Pause frames when the device is overwhelmed by ingress traffic (TX
pause) and the ability to stop sending traffic upon receiving Pause
frames (RX pause).
On the other hand, 802.3 explains that devices can exchange their
abilities over link negotiation, but instead of echanging TX and RX
abilities, they exchange Pause and Asymmetric Pause capabilities :
RX unable TX unable => None
RX able TX unable => Pause + Asymmetric
RX unable TX able => Asymmetric
RX able TX able => Pause
The reported Pause and Asym abilities depend both on the MAC, that
eventually sends and processes these frames, and the PHY, that
advertises these to the partner.
Both MAC and PHYs can have their own limitations, and getting the
correct set of supported Pause/Asym parameters is non-trivial, unless
the MAC uses phylink, which deals with the complexity.
Introduce a set of Pause selftests that verify that the local
interface's supported pause parameters reported from ethtool (in terms
of Pause + Asym ) match the accepted parameters from "ethtool -A",
corresponding to ethtool's .set_pauseparams() ops, expressed in TX and
RX abilities.
Signed-off-by: Maxime Chevallier (Netdev Foundation) <maxime.chevallier@bootlin.com>
---
.../testing/selftests/drivers/net/hw/Makefile | 1 +
.../testing/selftests/drivers/net/hw/pause.py | 411 ++++++++++++++++++
2 files changed, 412 insertions(+)
create mode 100755 tools/testing/selftests/drivers/net/hw/pause.py
diff --git a/tools/testing/selftests/drivers/net/hw/Makefile b/tools/testing/selftests/drivers/net/hw/Makefile
index bd3b8d2fa47e..f0aeb70c20fd 100644
--- a/tools/testing/selftests/drivers/net/hw/Makefile
+++ b/tools/testing/selftests/drivers/net/hw/Makefile
@@ -44,6 +44,7 @@ TEST_PROGS = \
nk_netns.py \
nk_qlease.py \
ntuple.py \
+ pause.py \
pp_alloc_fail.py \
rss_api.py \
rss_ctx.py \
diff --git a/tools/testing/selftests/drivers/net/hw/pause.py b/tools/testing/selftests/drivers/net/hw/pause.py
new file mode 100755
index 000000000000..f07db3271500
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/hw/pause.py
@@ -0,0 +1,411 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+"""
+Driver-related behavior tests for Pause-based Flow Control.
+"""
+
+import errno
+import json
+import os
+import time
+
+from lib.py import KsftFailEx, KsftNamedVariant, KsftSkipEx
+from lib.py import NetDrvEpEnv, EthtoolFamily
+from lib.py import cmd, defer, ethtool, ip
+from lib.py import ksft_disruptive, ksft_variants, ksft_run
+from lib.py import ksft_eq, ksft_exit, ksft_in, ksft_not_in, ksft_pr
+
+# Linkmodes to Pause params :
+# Pause bit is set if rx == 1
+# Asym_Pause bit is set if rx != tx
+pauseparams_to_linkmodes = {
+ 0: {0: {"rx": 0, "tx": 0, "linkmodes": []},
+ 1: {"rx": 0, "tx": 1, "linkmodes": ["Asym_Pause"]}},
+ 1: {0: {"rx": 1, "tx": 0, "linkmodes": ["Pause", "Asym_Pause"]},
+ 1: {"rx": 1, "tx": 1, "linkmodes": ["Pause"]}},
+}
+
+def onoff(val):
+ """ Convert a bool to on/off """
+ return "on" if val else "off"
+
+pauseparams_variants = [
+ KsftNamedVariant(f"RX {onoff(p['rx'])} TX {onoff(p['tx'])}", p)
+ for by_tx in pauseparams_to_linkmodes.values() for p in by_tx.values()
+]
+
+_strerrors = {os.strerror(e): e for e in errno.errorcode}
+
+def ethtool_ret(command, is_get=True, host=None):
+ """ Execute an ethtool command, returns the return code and JSON content
+
+ :param command: the ethtool arguments
+ :param is_get: Is the command a get or a set. Get commands return the loaded
+ JSON attributes
+ :param host: The host on which to run the command on. None means local host.
+ """
+ json_flag = "--json" if is_get else ""
+ cmd_res = cmd(f"ethtool {json_flag} {command}", host=host, fail=False)
+
+ if cmd_res.ret != 0:
+ # ethtool returns 1 upon error, not the netlink errcode. Try to get it
+ # by parsing the stderr output, which looks like :
+ # "netlink error: Operation not supported"
+ for line in cmd_res.stderr.splitlines():
+ err = _strerrors.get(line.rsplit(": ", 1)[-1].strip())
+ if err:
+ return err, None
+ return cmd_res.ret, None
+
+ # Not a get operation, we don't have any JSON output to parse
+ if not is_get:
+ return 0, None
+
+ return 0, json.loads(cmd_res.stdout)[0]
+
+def wait_for_aneg(cfg, link_drop=False, timeout=15):
+ """ Wait for a renegotiation to complete.
+
+ :param link_drop: Set to true if the link HAS to flap.
+ :returns: True if link is UP, False if timeout
+ """
+ deadline = time.monotonic() + timeout
+
+ # Link has 2 seconds to come back up
+ restart_by = time.monotonic() + 2
+
+ # The link may still be up for a short while when we trigger an autoneg
+ # restart, we need to wait for it to drop, then come back up again
+ while time.monotonic() < deadline:
+ if not ethtool(f"{cfg.ifname}", json=True)[0]["link-detected"]:
+ return wait_for_link(cfg)
+
+ if not link_drop and time.monotonic() > restart_by:
+ return wait_for_link(cfg)
+
+ time.sleep(0.1)
+
+ return False
+
+def wait_for_link_local(cfg, timeout=15):
+ """ Wait for the local link to be up """
+ deadline = time.monotonic() + timeout
+
+ while time.monotonic() < deadline:
+ link = ethtool(f"{cfg.ifname}", json=True)[0]["link-detected"]
+ if link:
+ return True
+
+ time.sleep(0.1)
+
+ return False
+
+def wait_for_link_remote(cfg, timeout=15):
+ """ Wait for the far end of the link to be up """
+ deadline = time.monotonic() + timeout
+
+ while time.monotonic() < deadline:
+ link = ethtool(f"{cfg.remote_ifname}", json=True,
+ host=cfg.remote)[0]["link-detected"]
+ if link:
+ return True
+
+ time.sleep(0.1)
+
+ return False
+
+def wait_for_link(cfg):
+ """ Wait for both ends of the link to be up """
+ if not wait_for_link_local(cfg):
+ return False
+
+ # Local link is UP, we shouldn't have to wait for a whole 8 seconds for
+ # the remote to report link up, let's wait a bit less
+ return wait_for_link_remote(cfg, timeout = 3)
+
+def forced_link_settings(cfg):
+ """ Returns a string to pass to ethtool -s with speed/duplex corresponding
+ to the current settings.
+
+ Note that some devices don't return duplex info, so assume full duplex
+ in that case.
+ """
+ link = ethtool(f"{cfg.ifname}", json=True)[0]
+ if "speed" not in link:
+ return ""
+
+ return f"speed {link['speed']} duplex {link.get('duplex', 'Full').lower()}"
+
+def _ethtool_pause_use_to_linkmodes(use):
+ """ Convert the ethtool output for pause modes into pause linkmodes """
+ if use == "Symmetric":
+ return ["Pause"]
+ elif use == "Symmetric Receive-only":
+ return ["Pause", "Asym_Pause"]
+ elif use == "Transmit-only":
+ return ["Asym_Pause"]
+ else:
+ return []
+
+def set_local_pauseparams(cfg, rx, tx, aneg):
+ """ set pauseparams : ethtool -A
+
+ Raise an error if the return is not 0 or EOPNOTSUPP
+ """
+ rx_param = onoff(rx)
+ tx_param = onoff(tx)
+ aneg_param = onoff(aneg)
+
+ ret, _ = ethtool_ret(f"-A {cfg.ifname} rx {rx_param} tx {tx_param}"
+ f" autoneg {aneg_param}",
+ is_get = False)
+
+ return ret
+
+def get_local_pauseparams(cfg):
+ """ get pauseparams : ethtool -a
+
+ Raise an error if the return is not 0 or EOPNOTSUPP
+ """
+ return ethtool_ret(f"-a {cfg.ifname}", is_get=True)
+
+def get_local_pause_supported(cfg):
+ """ Return the errcode and the local pause supported linkmodes """
+
+ ret, data = ethtool_ret(f"{cfg.ifname}")
+ if ret != 0:
+ raise KsftFailEx(f"ethtool {cfg.ifname} failed: {ret}")
+
+ return ret, _ethtool_pause_use_to_linkmodes(data["supported-pause-frame-use"])
+
+def get_local_pause_advertising(cfg):
+ """ Return the errcode and the local pause advertised linkmodes """
+
+ ret, data = ethtool_ret(f"{cfg.ifname}")
+ if ret != 0:
+ raise KsftFailEx(f"ethtool {cfg.ifname} failed: {ret}")
+
+ return ret, _ethtool_pause_use_to_linkmodes(data["advertised-pause-frame-use"])
+
+def require_pause_supported_allof(cfg, linkmodes):
+ """ Skip if local device doesn't support all of the passed modes """
+
+ ret, _ = get_local_pauseparams(cfg)
+ if ret != 0:
+ raise KsftSkipEx("device doesn't allow getting pauseparams")
+
+ _, pause_support = get_local_pause_supported(cfg)
+ for lm in linkmodes:
+ if lm not in pause_support:
+ raise KsftSkipEx(f"Local device doesn't support {lm}")
+
+def expect_pauseparams_set(ret, linkmodes, supported, note):
+ """ Whether ethtool -A had to work or to be refused, given what the local
+ device supports
+ """
+
+ # If supported is empty, ethtool -A must return -EOPNOTSUPP
+ if not supported :
+ ksft_eq(ret, errno.EOPNOTSUPP, note)
+ elif set(linkmodes).issubset(set(supported)) :
+ # The configured pauseparams are supposed to be supported,
+ #ethtool -A must have worked.
+ ksft_eq(ret, 0, note)
+ else :
+ # We tried to configure parameters that aren't supporteed,
+ # ethtool -A must have failed.
+ ksft_in(ret, (errno.EOPNOTSUPP, errno.EINVAL), note)
+
+def pause_setup(cfg):
+ """ The starting conditions every test counts on, restored on exit:
+ - both ports admin up
+ - link autoneg on on both sides ifsupported
+ - link actually up (carrier on)
+ """
+
+ # Get init pause parameters
+ ret, params = ethtool_ret(f"-a {cfg.ifname}")
+ if ret == 0:
+ defer(cmd, f"ethtool -A {cfg.ifname} rx {onoff(params['rx'])} "
+ f"tx {onoff(params['tx'])} "
+ f"autoneg {onoff(params['autonegotiate'])}")
+
+ # Get init link parameters
+ link = ethtool(f"{cfg.ifname}", json=True)[0]
+ if link["auto-negotiation"]:
+ defer(cmd, f"ethtool -s {cfg.ifname} autoneg on")
+ elif "speed" in link and "duplex" in link:
+ defer(cmd, f"ethtool -s {cfg.ifname} autoneg off speed {link['speed']} "
+ f"duplex {link['duplex'].lower()}")
+
+ # Local interface admin up, link aneg on
+ ip(f"link set {cfg.ifname} up")
+ if link["supports-auto-negotiation"] and not link["auto-negotiation"]:
+ ethtool(f"-s {cfg.ifname} autoneg on")
+
+ # Get remote pause params
+ ret, params = ethtool_ret(f"-a {cfg.remote_ifname}", host=cfg.remote)
+ if ret == 0:
+ defer(cmd, f"ethtool -A {cfg.remote_ifname} rx {onoff(params['rx'])} "
+ f"tx {onoff(params['tx'])} "
+ f"autoneg {onoff(params['autonegotiate'])}",
+ host=cfg.remote)
+
+ # Get remote link params
+ link = ethtool(f"{cfg.remote_ifname}", json=True, host=cfg.remote)[0]
+ if link["auto-negotiation"]:
+ defer(cmd, f"ethtool -s {cfg.remote_ifname} autoneg on",
+ host=cfg.remote)
+ elif "speed" in link and "duplex" in link:
+ defer(cmd, f"ethtool -s {cfg.remote_ifname} autoneg off "
+ f"speed {link['speed']} duplex {link['duplex'].lower()}",
+ host=cfg.remote)
+
+ # Remote interface admin up, link aneg on
+ ip(f"link set {cfg.remote_ifname} up", host=cfg.remote)
+ if link["supports-auto-negotiation"] and not link["auto-negotiation"]:
+ ethtool(f"-s {cfg.remote_ifname} autoneg on", host=cfg.remote)
+
+ # Wait for link to become up on both ends
+ if not wait_for_link(cfg):
+ raise KsftFailEx("No link before the test")
+
+# Pause support : Supported linkmodes vs ability to set/get pauseparams
+@ksft_variants(pauseparams_variants)
+@ksft_disruptive
+def pause_test_support(cfg, pauseparams):
+ """ Verify that the supported linkmodes Pause and Asym_Pause match the
+ ability to configure the rx and tx pauseparams.
+
+ Drivers are expected to reject pauseparams they don't support, and
+ accept the ones they support. The supported modes are exposed by
+ the MAC to the PHY layer through phylink mac_capabilities MAC_SYM_PAUSE
+ and MAC_ASYM_PAUSE, or through phylib directly with the
+ phy_support_sym_pause() and phy_support_asym_pause() helpers.
+
+ The expectation is for drivers to refuse setting pauseparams that don't
+ match the Pause and Asym_Pause bits in the supported linkmodes with a
+ -EOPNOTSUPP return value. Unsupported pause params must be rejected.
+
+ Failing this test likely means the MAC driver doesn't implement the
+ set/get_pauseparam, but still sets flow control as supported through
+ phylink mac_capabilities or phylib's pause API. Conversely, the MAC driver
+ may have omitted to indicate its supported Pause modes. Finally, the PHY
+ driver may incorrectly override the Pause and Asym_Pause bits in its
+ supported fields.
+
+ The sequence runs with link autoneg on, then with the link forced
+ (ethtool -s ethX autoneg off): the pause params are accepted or rejected
+ the same way in both cases, and both with pause autoneg off and on.
+ """
+
+ rx = onoff(pauseparams["rx"])
+ tx = onoff(pauseparams["tx"])
+ linkmodes = pauseparams["linkmodes"]
+
+ pause_setup(cfg)
+
+ forced = forced_link_settings(cfg)
+ _, supported = get_local_pause_supported(cfg)
+
+ # We check that what we can configure in the pause params matches what we
+ # support under various contditions : Link aneg on/off, pause aneg on/off
+ ret, _ = ethtool_ret(f"-s {cfg.ifname} autoneg on", is_get = False)
+ if ret != 0:
+ ksft_pr("link autoneg on refused, not tested")
+ else:
+ ret, _ = ethtool_ret(f"-A {cfg.ifname} rx {rx} tx {tx} autoneg off",
+ is_get = False)
+ expect_pauseparams_set(ret, linkmodes, supported, "link autoneg on")
+
+ ret, _ = ethtool_ret(f"-A {cfg.ifname} rx {rx} tx {tx} autoneg on",
+ is_get = False)
+ expect_pauseparams_set(ret, linkmodes, supported, "link autoneg on")
+
+ if not forced:
+ ksft_pr("link speed unknown, the forced link is not tested")
+ return
+
+ ret, _ = ethtool_ret(f"-s {cfg.ifname} autoneg off {forced}", is_get = False)
+ if ret != 0:
+ ksft_pr(f"link autoneg off {forced} refused, not tested")
+ return
+
+ ret, _ = ethtool_ret(f"-A {cfg.ifname} rx {rx} tx {tx} autoneg off",
+ is_get = False)
+ expect_pauseparams_set(ret, linkmodes, supported, "link autoneg off")
+
+ ret, _ = ethtool_ret(f"-A {cfg.ifname} rx {rx} tx {tx} autoneg on",
+ is_get = False)
+ expect_pauseparams_set(ret, linkmodes, supported, "link autoneg off")
+
+@ksft_variants(pauseparams_variants)
+@ksft_disruptive
+def pause_advertising_test(cfg, pauseparams):
+ """Pause advertisement
+
+ Validate that changing pause params through the ETHTOOL_MSG_PAUSE command
+ translates to a change in the advertised pause params, and that these
+ parameters are correct w.r.t the supported pause params and requested pause
+ params.
+
+ This exercises the .set_pauseparam() ethtool ops for MAC configuration,
+ as well as the reconfiguration of the PHY's advertising and negotiation.
+
+ On non-phylink MACs, the MAC should call phy_set_sym_pause() to update the
+ PHY's advertising, and restart a negotiation with phy_start_aneg() if
+ need be. Failure to do so will result in the wrong advertising parameters.
+
+ On phylink-enabled MACs, phylink deals with the PHY reconfiguration provided
+ the MAC driver calls phylink_ethtool_set_pauseparam().
+
+ Failing this test likely means that the PHY driver is not correctly
+ advertising pause settings, either due to the MAC not triggering a PHY
+ reconfiguration, a misconfiguration of the advertising registers by the PHY,
+ or by mis-handling the phydev->advertising bitmap in the PHY driver directly.
+
+ The validation is made by looking at the advertised modes locally, as well
+ as what the peer's 'lp_advertising' values report.
+ """
+
+ require_pause_supported_allof(cfg, pauseparams["linkmodes"])
+ pause_setup(cfg)
+
+ tx = pauseparams["tx"]
+ rx = pauseparams["rx"]
+ adv = pauseparams["linkmodes"]
+ not_adv = [ l for l in ["Pause", "Asym_Pause"] if l not in adv]
+
+ # It's OK to skip here, we're already validating the EOPNOTSUPP behaviour
+ # the pause_test_support test.
+ ret = set_local_pauseparams(cfg, rx, tx, True)
+ if ret == errno.EOPNOTSUPP:
+ raise KsftSkipEx(f"RX {rx} TX {tx} not supported")
+
+ # Wait for link parameters to re-negotiate and link to come back up. It must
+ # come back up, otherwise that means changing pauseparams can bring the
+ # link down.
+ ret = wait_for_aneg(cfg)
+ ksft_eq(ret, True)
+
+ _, linkmodes = get_local_pause_advertising(cfg)
+ for mode in adv:
+ ksft_in(mode, linkmodes,
+ f"rx {rx} tx {tx} aneg on must advertise {adv}")
+
+ for mode in not_adv:
+ ksft_not_in(mode, linkmodes,
+ f"rx {rx} tx {tx} aneg on must not advertise {not_adv}")
+
+def main():
+ with NetDrvEpEnv(__file__, nsim_test=False) as cfg:
+ cfg.ethnl = EthtoolFamily()
+ ksft_run([pause_test_support,
+ pause_advertising_test,
+ ],
+ args=(cfg, ))
+ ksft_exit()
+
+if __name__ == "__main__":
+ main()
--
2.55.0
^ permalink raw reply [flat|nested] 4+ messages in thread* [PATCH net-next v2 2/3] selftests: drv-net: pause: Validate the pause autonegotiation with a partner
2026-09-25 18:26 [PATCH net-next v2 0/3] selftests: drv-net: Introduce flow-control selftest Maxime Chevallier (Netdev Foundation)
2026-09-25 18:26 ` [PATCH net-next v2 1/3] selftests: drv-net: Introduce a selftest for ethtool flow control Maxime Chevallier (Netdev Foundation)
@ 2026-09-25 18:26 ` Maxime Chevallier (Netdev Foundation)
2026-09-25 18:26 ` [PATCH net-next v2 3/3] selftests: drv-net: pause: Validate pause autoneg interactions with link autoneg Maxime Chevallier (Netdev Foundation)
2 siblings, 0 replies; 4+ messages in thread
From: Maxime Chevallier (Netdev Foundation) @ 2026-09-25 18:26 UTC (permalink / raw)
To: Andrew Lunn, Jakub Kicinski, davem, Eric Dumazet, Paolo Abeni,
Simon Horman, Russell King, Heiner Kallweit, Jonathan Corbet,
Shuah Khan
Cc: Maxime Chevallier (Netdev Foundation),
Oleksij Rempel, Vladimir Oltean, Florian Fainelli,
thomas.petazzoni, netdev, linux-kernel, linux-doc
Pause autonegotiation behaves differently than the regular link params
autonegotiation, in that the user intention may differ from the
negotiated pause parameters.
Introduce a test that validates we're correctly resolving pause
parameters according to 802.3.
The validation is done based on what the local interface reports in
terms of advertised and lp_advertised linkmodes.
If the remote can express what it sees in terms of its own advertised
and lp_advertised modes, validate the autoneg results on the peer as
well.
Signed-off-by: Maxime Chevallier (Netdev Foundation) <maxime.chevallier@bootlin.com>
---
.../testing/selftests/drivers/net/hw/pause.py | 350 ++++++++++++++++++
1 file changed, 350 insertions(+)
diff --git a/tools/testing/selftests/drivers/net/hw/pause.py b/tools/testing/selftests/drivers/net/hw/pause.py
index f07db3271500..96ee730074f8 100755
--- a/tools/testing/selftests/drivers/net/hw/pause.py
+++ b/tools/testing/selftests/drivers/net/hw/pause.py
@@ -124,6 +124,62 @@ def wait_for_link(cfg):
# the remote to report link up, let's wait a bit less
return wait_for_link_remote(cfg, timeout = 3)
+def controllable_lp(cfg):
+ """ Whether the remote interface is the link partner of the local one.
+
+ For low level ethtool tests, we need to have the remote directly connected
+ to the local host (i.e. not through a switch).
+
+ This is tested by taking the local link down and checking that the
+ remote's link drops.
+
+ :returns: True if the remote is our link partner
+ """
+ known = getattr(cfg, "lp_controllable", None)
+ if known is not None:
+ return known
+
+ # Set both ends up, wait for up
+ ip(f"link set {cfg.ifname} up")
+ ip(f"link set {cfg.remote_ifname} up", host=cfg.remote)
+
+ # No link established
+ if not wait_for_link(cfg):
+ ksft_pr(f"{cfg.remote_ifname} is not the link partner: no link with both ends up")
+ cfg.lp_controllable = False
+ return False
+
+ ip(f"link set {cfg.ifname} down")
+
+ deadline = time.monotonic() + 3
+ dropped = False
+ while time.monotonic() < deadline and not dropped:
+ dropped = not ethtool(f"{cfg.remote_ifname}", json=True,
+ host=cfg.remote)[0]["link-detected"]
+ time.sleep(0.1)
+
+ ip(f"link set {cfg.ifname} up")
+
+ if not dropped:
+ ksft_pr(f"{cfg.remote_ifname} is not the link partner: "
+ f"it kept its link through {cfg.ifname} going down")
+ cfg.lp_controllable = False
+ wait_for_link(cfg)
+ return False
+
+ cfg.lp_controllable = wait_for_link(cfg)
+ if not cfg.lp_controllable:
+ ksft_pr(f"{cfg.remote_ifname} is not the link partner: "
+ f"no link back after {cfg.ifname} came up")
+ return cfg.lp_controllable
+
+def require_controllable_lp(cfg):
+ """ Skip if the remote isn't directly controllable, e.g. accessed through
+ a switch
+ """
+ if not controllable_lp(cfg):
+ raise KsftSkipEx(f"{cfg.remote_ifname} is not directly connected to {cfg.ifname}")
+
def forced_link_settings(cfg):
""" Returns a string to pass to ethtool -s with speed/duplex corresponding
to the current settings.
@@ -148,6 +204,10 @@ def _ethtool_pause_use_to_linkmodes(use):
else:
return []
+def pause_to_linkmodes(rx, tx):
+ """ Convert the bool rx/tx pause into Pause/Asym """
+ return pauseparams_to_linkmodes[rx][tx]["linkmodes"]
+
def set_local_pauseparams(cfg, rx, tx, aneg):
""" set pauseparams : ethtool -A
@@ -170,6 +230,33 @@ def get_local_pauseparams(cfg):
"""
return ethtool_ret(f"-a {cfg.ifname}", is_get=True)
+def set_peer_pauseparams(cfg, rx, tx, aneg):
+ """ set pauseparams : ethtool -A
+
+ Raise an error if the return is not 0 or EOPNOTSUPP
+ """
+ rx_param = onoff(rx)
+ tx_param = onoff(tx)
+ aneg_param = onoff(aneg)
+
+ ret, _ = ethtool_ret(f"-A {cfg.remote_ifname} rx {rx_param} tx {tx_param}"
+ f" autoneg {aneg_param}",
+ is_get = False, host=cfg.remote)
+
+ if ret != 0:
+ raise KsftSkipEx(f"Can't set pauseparams on peer: {errno.errorcode.get(ret, ret)}")
+
+ return ret
+
+def get_peer_pauseparams(cfg):
+ """ get pauseparams : ethtool -a
+
+ Raise an error if the return is not 0 or EOPNOTSUPP
+ """
+
+ return ethtool_ret(f"-a {cfg.remote_ifname}", is_get=True,
+ host=cfg.remote)
+
def get_local_pause_supported(cfg):
""" Return the errcode and the local pause supported linkmodes """
@@ -188,6 +275,55 @@ def get_local_pause_advertising(cfg):
return ret, _ethtool_pause_use_to_linkmodes(data["advertised-pause-frame-use"])
+def get_local_pause_lp_advertising(cfg):
+ """ Return the errcode and the local pause lp_advertised linkmodes,
+ if any.
+ """
+
+ ret, data = ethtool_ret(f"{cfg.ifname}")
+ if ret != 0:
+ raise KsftFailEx(f"ethtool {cfg.ifname} failed: {errno.errorcode.get(ret, ret)}")
+
+ if "link-partner-advertised-pause-frame-use" in data:
+ return ret, _ethtool_pause_use_to_linkmodes(data["link-partner-advertised-pause-frame-use"])
+ else:
+ ksft_pr(f"Warning: {cfg.ifname} does not report the LP's advertising")
+ return errno.EOPNOTSUPP, None
+
+def get_peer_pause_supported(cfg):
+ """ Return the errcode and the remote pause supported linkmodes """
+
+ ret, data = ethtool_ret(f"{cfg.remote_ifname}", host = cfg.remote)
+ if ret != 0:
+ raise KsftFailEx(f"ethtool {cfg.remote_ifname} failed: {errno.errorcode.get(ret, ret)}")
+
+ return ret, _ethtool_pause_use_to_linkmodes(data["supported-pause-frame-use"])
+
+
+def get_peer_pause_advertising(cfg):
+ """ Return the errcode and the remote pause advertised linkmodes """
+
+ ret, data = ethtool_ret(f"{cfg.remote_ifname}", host = cfg.remote)
+ if ret != 0:
+ raise KsftFailEx(f"ethtool {cfg.remote_ifname} failed: {errno.errorcode.get(ret, ret)}")
+
+ return ret, _ethtool_pause_use_to_linkmodes(data["advertised-pause-frame-use"])
+
+def get_peer_pause_lp_advertising(cfg):
+ """ Return the errcode and the local pause lp_advertised linkmodes,
+ if any.
+ """
+
+ ret, data = ethtool_ret(f"{cfg.remote_ifname}", host = cfg.remote)
+ if ret != 0:
+ raise KsftFailEx(f"ethtool {cfg.remote_ifname} failed: {errno.errorcode.get(ret, ret)}")
+
+ if "link-partner-advertised-pause-frame-use" in data:
+ return ret, _ethtool_pause_use_to_linkmodes(data["link-partner-advertised-pause-frame-use"])
+ else:
+ ksft_pr(f"Warning: {cfg.remote_ifname} does not report the LP's advertising")
+ return errno.EOPNOTSUPP, None
+
def require_pause_supported_allof(cfg, linkmodes):
""" Skip if local device doesn't support all of the passed modes """
@@ -200,6 +336,32 @@ def require_pause_supported_allof(cfg, linkmodes):
if lm not in pause_support:
raise KsftSkipEx(f"Local device doesn't support {lm}")
+def require_peer_pause_supported_anyof(cfg, linkmodes):
+ """ Skip if remote device doesn't support any of the passed modes """
+
+ ret, _ = get_peer_pauseparams(cfg)
+ if ret != 0:
+ raise KsftSkipEx("Remote device doesn't allow getting pauseparams")
+
+ _, pause_support = get_peer_pause_supported(cfg)
+ for lm in linkmodes:
+ if lm in pause_support:
+ return
+
+ raise KsftSkipEx(f"Local device doesn't support any of {linkmodes}")
+
+def require_peer_pause_supported_allof(cfg, linkmodes):
+ """ Skip if local device doesn't support all of the passed modes """
+
+ ret, _ = get_peer_pauseparams(cfg)
+ if ret != 0:
+ raise KsftSkipEx("Remote device doesn't allow getting pauseparams")
+
+ _, pause_support = get_peer_pause_supported(cfg)
+ for lm in linkmodes:
+ if lm not in pause_support:
+ raise KsftSkipEx(f"Remote device doesn't support {lm}")
+
def expect_pauseparams_set(ret, linkmodes, supported, note):
""" Whether ethtool -A had to work or to be refused, given what the local
device supports
@@ -371,6 +533,7 @@ def pause_advertising_test(cfg, pauseparams):
require_pause_supported_allof(cfg, pauseparams["linkmodes"])
pause_setup(cfg)
+ lp = controllable_lp(cfg)
tx = pauseparams["tx"]
rx = pauseparams["rx"]
@@ -398,11 +561,198 @@ def pause_advertising_test(cfg, pauseparams):
ksft_not_in(mode, linkmodes,
f"rx {rx} tx {tx} aneg on must not advertise {not_adv}")
+ if not lp:
+ return
+
+ returncode, remote_linkmodes = get_peer_pause_lp_advertising(cfg)
+ if returncode == errno.EOPNOTSUPP:
+ return
+
+ for mode in adv:
+ ksft_in(mode, remote_linkmodes, f"PHY does not advertise {adv}")
+
+ for mode in not_adv:
+ ksft_not_in(mode, remote_linkmodes,
+ f"PHY incorrectly advertises {not_adv}")
+
+
+# Pause autonegotiation resolution : Resolved pause settings vs configured
+# pauseparams on local device and link partner
+@ksft_variants([
+ # We advertise nothing, all off
+ KsftNamedVariant("local rx off tx off, remote rx off tx off",
+ {"rx": 0, "tx": 0, "lp_rx": 0, "lp_tx": 0, "neg_rx": 0, "neg_tx": 0}),
+
+ # We advertise nothing, all off
+ KsftNamedVariant("local rx off tx off, remote rx off tx on",
+ {"rx": 0, "tx": 0, "lp_rx": 0, "lp_tx": 1, "neg_rx": 0, "neg_tx": 0}),
+
+ # We advertise nothing, all off
+ KsftNamedVariant("local rx off tx off, remote rx on tx off",
+ {"rx": 0, "tx": 0, "lp_rx": 1, "lp_tx": 0, "neg_rx": 0, "neg_tx": 0}),
+
+ # We advertise nothing, all off
+ KsftNamedVariant("local rx off tx off, remote rx on tx on",
+ {"rx": 0, "tx": 0, "lp_rx": 1, "lp_tx": 1, "neg_rx": 0, "neg_tx": 0}),
+
+ # LP advertises nothing, all off
+ KsftNamedVariant("local rx off tx on, remote rx off tx off",
+ {"rx": 0, "tx": 1, "lp_rx": 0, "lp_tx": 0, "neg_rx": 0, "neg_tx": 0}),
+
+ # We advertise Asym, LP advertises Asym, all off
+ KsftNamedVariant("local rx off tx on, remote rx off tx on",
+ {"rx": 0, "tx": 1, "lp_rx": 0, "lp_tx": 1, "neg_rx": 0, "neg_tx": 0}),
+
+ # We advertise Asym, LP advertises Pause + Asym, tx on
+ KsftNamedVariant("local rx off tx on, remote rx on tx off",
+ {"rx": 0, "tx": 1, "lp_rx": 1, "lp_tx": 0, "neg_rx": 0, "neg_tx": 1}),
+
+ # Tricky case :
+ # We advertise Asym, LP advertises Pause, resolves to all off
+ KsftNamedVariant("local rx off tx on, remote rx on tx on",
+ {"rx": 0, "tx": 1, "lp_rx": 1, "lp_tx": 1, "neg_rx": 0, "neg_tx": 0}),
+
+ # LP advertises nothing, all off
+ KsftNamedVariant("local rx on tx off, remote rx off tx off",
+ {"rx": 1, "tx": 0, "lp_rx": 0, "lp_tx": 0, "neg_rx": 0, "neg_tx": 0}),
+
+ # We advertise Pause + Asym , LP advertises Asym, rx on
+ KsftNamedVariant("local rx on tx off, remote rx off tx on",
+ {"rx": 1, "tx": 0, "lp_rx": 0, "lp_tx": 1, "neg_rx": 1, "neg_tx": 0}),
+
+ # Also tricky: Only rx enabled on both ends, but we negotiate rx/tx
+ # We advertise Pause + Asym, LP advertises Pause + Asym, all on
+ KsftNamedVariant("local rx on tx off, remote rx on tx off",
+ {"rx": 1, "tx": 0, "lp_rx": 1, "lp_tx": 0, "neg_rx": 1, "neg_tx": 1}),
+
+ # We advertise Pause + Asym, LP advertises Pause, all on
+ KsftNamedVariant("local rx on tx off, remote rx on tx on",
+ {"rx": 1, "tx": 0, "lp_rx": 1, "lp_tx": 1, "neg_rx": 1, "neg_tx": 1}),
+
+ # LP advertises nothing, all off
+ KsftNamedVariant("local rx on tx on, remote rx off tx off",
+ {"rx": 1, "tx": 1, "lp_rx": 0, "lp_tx": 0, "neg_rx": 0, "neg_tx": 0}),
+
+ # Tricky case :
+ # We advertise Pause, LP advertises Asym, resolves to all off
+ KsftNamedVariant("local rx on tx on, remote rx off tx on",
+ {"rx": 1, "tx": 1, "lp_rx": 0, "lp_tx": 1, "neg_rx": 0, "neg_tx": 0}),
+
+ # We advertise Pause, LP advertises Pause + Asym, all on
+ KsftNamedVariant("local rx on tx on, remote rx on tx off",
+ {"rx": 1, "tx": 1, "lp_rx": 1, "lp_tx": 0, "neg_rx": 1, "neg_tx": 1}),
+
+ # We advertise Pause, LP advertises Pause, all on
+ KsftNamedVariant("local rx on tx on, remote rx on tx on",
+ {"rx": 1, "tx": 1, "lp_rx": 1, "lp_tx": 1, "neg_rx": 1, "neg_tx": 1}),
+])
+@ksft_disruptive
+def pause_aneg_resolution(cfg, settings):
+ """ Verify that rx and tx pause parameters are negotiated according to 802.3
+
+ 802.3 dictates the rules for pause negotiation, all 16 cases are tested, one
+ for each combination of Pause and Asym_Pause advertising on the local device
+ and the link-partner.
+
+ This test also verifies that the peer resolved the parameters correctly,
+ to ensure the negotiation is triggered correctly.
+
+ Failing this test can happen if :
+ - The MAC accepts the pause parameters but doesn't trigger a link
+ renegotiation
+ - that the PHY driver manually overwrites the Pause negotiation result
+ - that the MAC driver ignores the Pause resolution and sets its own
+ pause parameters regardless
+ """
+
+ expected_local_rx = settings["neg_rx"]
+ expected_local_tx = settings["neg_tx"]
+
+ required_local_linkmodes = pause_to_linkmodes(settings["rx"],
+ settings["tx"])
+ required_remote_linkmodes = pause_to_linkmodes(settings["lp_rx"],
+ settings["lp_tx"])
+
+ require_pause_supported_allof(cfg, required_local_linkmodes)
+ require_peer_pause_supported_allof(cfg, required_remote_linkmodes)
+ require_controllable_lp(cfg)
+ pause_setup(cfg)
+
+ # There's symmetry between local device and LP on pause negotiation:
+ # - if local resolves all off or all on, LP must resolve the same
+ # - if local resolves RX only, remote must resolve to TX only
+ # - if local resolves TX only, remote must resolve to RX only
+ if expected_local_rx == expected_local_tx:
+ expected_lp_rx = expected_local_rx
+ expected_lp_tx = expected_local_tx
+ else:
+ expected_lp_rx = expected_local_tx
+ expected_lp_tx = expected_local_rx
+
+ # Set pauseparams
+ ret = set_local_pauseparams(cfg, settings["rx"], settings["tx"], True)
+ if ret == errno.EOPNOTSUPP:
+ raise KsftSkipEx(f"RX {settings['rx']} TX {settings['tx']} not supported")
+
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ set_peer_pauseparams(cfg, settings["lp_rx"], settings["lp_tx"], True)
+
+ # Wait for link to re-negotiate
+ ret = wait_for_aneg(cfg)
+
+ # Fail if it doesn't
+ ksft_eq(ret, True)
+
+ if get_local_pause_lp_advertising(cfg)[0] != 0:
+ raise KsftSkipEx("Local device doesn't report the LP's advertising")
+
+ ret, local_pauseparams = get_local_pauseparams(cfg)
+ if ret != 0 or "negotiated" not in local_pauseparams:
+ raise KsftSkipEx("Local device doesn't report the negotiated pause params")
+
+ # check adv
+ _, linkmodes = get_local_pause_advertising(cfg)
+ for mode in required_local_linkmodes:
+ ksft_in(mode, linkmodes,
+ f"local rx {settings['rx']} tx {settings['tx']} must advertise "
+ f"{required_local_linkmodes}")
+
+ _, linkmodes = get_peer_pause_advertising(cfg)
+ for mode in required_remote_linkmodes:
+ ksft_in(mode, linkmodes,
+ f"remote rx {settings['lp_rx']} tx {settings['lp_tx']} must advertise "
+ f"{required_remote_linkmodes}")
+
+ # check lp_adv if available
+ _, linkmodes = get_local_pause_lp_advertising(cfg)
+ for mode in required_remote_linkmodes:
+ ksft_in(mode, linkmodes,
+ f"local lp_adv must show the remote's {required_remote_linkmodes}")
+
+ # check lp_adv on remote
+ ret, linkmodes = get_peer_pause_lp_advertising(cfg)
+ if ret == 0:
+ for mode in required_local_linkmodes:
+ ksft_in(mode, linkmodes,
+ f"remote lp_adv must show our {required_local_linkmodes}")
+
+ # Check resolution
+ _, local_pauseparams = get_local_pauseparams(cfg)
+ ksft_eq(local_pauseparams["negotiated"]["rx"], expected_local_rx)
+ ksft_eq(local_pauseparams["negotiated"]["tx"], expected_local_tx)
+
+ ret, remote_pauseparams = get_peer_pauseparams(cfg)
+ if ret == 0 and "negotiated" in remote_pauseparams:
+ ksft_eq(remote_pauseparams["negotiated"]["rx"], expected_lp_rx)
+ ksft_eq(remote_pauseparams["negotiated"]["tx"], expected_lp_tx)
+
def main():
with NetDrvEpEnv(__file__, nsim_test=False) as cfg:
cfg.ethnl = EthtoolFamily()
ksft_run([pause_test_support,
pause_advertising_test,
+ pause_aneg_resolution,
],
args=(cfg, ))
ksft_exit()
--
2.55.0
^ permalink raw reply [flat|nested] 4+ messages in thread* [PATCH net-next v2 3/3] selftests: drv-net: pause: Validate pause autoneg interactions with link autoneg
2026-09-25 18:26 [PATCH net-next v2 0/3] selftests: drv-net: Introduce flow-control selftest Maxime Chevallier (Netdev Foundation)
2026-09-25 18:26 ` [PATCH net-next v2 1/3] selftests: drv-net: Introduce a selftest for ethtool flow control Maxime Chevallier (Netdev Foundation)
2026-09-25 18:26 ` [PATCH net-next v2 2/3] selftests: drv-net: pause: Validate the pause autonegotiation with a partner Maxime Chevallier (Netdev Foundation)
@ 2026-09-25 18:26 ` Maxime Chevallier (Netdev Foundation)
2 siblings, 0 replies; 4+ messages in thread
From: Maxime Chevallier (Netdev Foundation) @ 2026-09-25 18:26 UTC (permalink / raw)
To: Andrew Lunn, Jakub Kicinski, davem, Eric Dumazet, Paolo Abeni,
Simon Horman, Russell King, Heiner Kallweit, Jonathan Corbet,
Shuah Khan
Cc: Maxime Chevallier (Netdev Foundation),
Oleksij Rempel, Vladimir Oltean, Florian Fainelli,
thomas.petazzoni, netdev, linux-kernel, linux-doc
Pause autonegotiation happens with the link partner using the same words
as the link negotiation, used for speed and duplex exchanges. However,
pause and link autonegotiation can be separately toggled :
ethtool -s eth0 autoneg on # Enable link negotiation
ethtool -A eth0 autoneg on # Enable Pause negotiation
Pause can't be negotiated if the link autoneg isn't enabled.
Pause autoneg and link autoneg settings must not interfere with one
another when user is configuring them :
- If Pause autoneg is on, it must stay on when link autoneg is disabled
(even though Pause won't actually be negotiated)
- If Pause autoneg is off, it must stay off when link autoneg is
enabled
Introduce a set of tests to verify that pause and link autoneg are
behaving correctly, in particular that the user intent is correctly
cached when toggling link autoneg.
Signed-off-by: Maxime Chevallier (Netdev Foundation) <maxime.chevallier@bootlin.com>
---
.../testing/selftests/drivers/net/hw/pause.py | 274 ++++++++++++++++++
1 file changed, 274 insertions(+)
diff --git a/tools/testing/selftests/drivers/net/hw/pause.py b/tools/testing/selftests/drivers/net/hw/pause.py
index 96ee730074f8..74bc21c60695 100755
--- a/tools/testing/selftests/drivers/net/hw/pause.py
+++ b/tools/testing/selftests/drivers/net/hw/pause.py
@@ -180,6 +180,17 @@ def require_controllable_lp(cfg):
if not controllable_lp(cfg):
raise KsftSkipEx(f"{cfg.remote_ifname} is not directly connected to {cfg.ifname}")
+def require_link_autoneg(cfg):
+ """ Skip if local or remote device don't support link aneg """
+ # Does local device support link aneg
+ if not ethtool(f"{cfg.ifname}", json=True)[0]["supports-auto-negotiation"]:
+ raise KsftSkipEx(f"{cfg.ifname} doesn't support link autoneg")
+
+ # Does remote device support link aneg
+ if not ethtool(f"{cfg.remote_ifname}",
+ json=True, host=cfg.remote)[0]["supports-auto-negotiation"]:
+ raise KsftSkipEx(f"Remote {cfg.remote_ifname} doesn't support link autoneg")
+
def forced_link_settings(cfg):
""" Returns a string to pass to ethtool -s with speed/duplex corresponding
to the current settings.
@@ -324,6 +335,20 @@ def get_peer_pause_lp_advertising(cfg):
ksft_pr(f"Warning: {cfg.remote_ifname} does not report the LP's advertising")
return errno.EOPNOTSUPP, None
+def require_pause_supported_anyof(cfg, linkmodes):
+ """ Skip if local device doesn't support any of the passed modes """
+
+ ret, _ = get_local_pauseparams(cfg)
+ if ret != 0:
+ raise KsftSkipEx("device doesn't allow getting pauseparams")
+
+ _, pause_support = get_local_pause_supported(cfg)
+ for lm in linkmodes:
+ if lm in pause_support:
+ return
+
+ raise KsftSkipEx(f"Local device doesn't support any of {linkmodes}")
+
def require_pause_supported_allof(cfg, linkmodes):
""" Skip if local device doesn't support all of the passed modes """
@@ -362,6 +387,49 @@ def require_peer_pause_supported_allof(cfg, linkmodes):
if lm not in pause_support:
raise KsftSkipEx(f"Remote device doesn't support {lm}")
+def supported_pauseparams(cfg):
+ """ The rx/tx params covering every mode the local device supports """
+
+ _, pause_support = get_local_pause_supported(cfg)
+ if "Pause" in pause_support:
+ return 1, 1
+ if "Asym_Pause" in pause_support:
+ return 0, 1
+
+ raise KsftSkipEx("Local device doesn't support pause")
+
+def set_local_pause_autoneg(cfg, aneg):
+ """ Enable/Disable local pause autoneg """
+
+ ret, _ = ethtool_ret(f"-A {cfg.ifname} autoneg {onoff(aneg)}",
+ is_get=False)
+ return ret
+
+def check_local_pauseparams(cfg, aneg, rx, tx):
+ """ Check that the local pauseparams are the passed parameters """
+
+ ret, params = get_local_pauseparams(cfg)
+ ksft_eq(ret, 0)
+ if ret != 0:
+ return
+
+ ksft_eq(params["autonegotiate"], bool(aneg), "pause autoneg")
+ ksft_eq(params["rx"], bool(rx), "rx pause")
+ ksft_eq(params["tx"], bool(tx), "tx pause")
+
+def check_local_advertising(cfg, linkmodes):
+ """ Check that the local advertised modes are the passed parameters """
+
+ _, adv = get_local_pause_advertising(cfg)
+ ksft_eq(adv, linkmodes, "advertised pause modes")
+
+def check_local_lp_advertising(cfg, linkmodes):
+ """ Check that the local lp_advertised modes are the passed parameters """
+
+ ret, adv = get_local_pause_lp_advertising(cfg)
+ if ret == 0:
+ ksft_eq(adv, linkmodes, "link partner advertised pause modes")
+
def expect_pauseparams_set(ret, linkmodes, supported, note):
""" Whether ethtool -A had to work or to be refused, given what the local
device supports
@@ -747,12 +815,218 @@ def pause_aneg_resolution(cfg, settings):
ksft_eq(remote_pauseparams["negotiated"]["rx"], expected_lp_rx)
ksft_eq(remote_pauseparams["negotiated"]["tx"], expected_lp_tx)
+@ksft_disruptive
+def pause_autoneg_state_adv(cfg):
+ """Validate that toggling pause advertising changes the advertised linkmodes
+
+ When disabling pause autoneg, we enforce the pause params based on what user
+ asks, instead of relying on the negociation process (which may not be what
+ the user asked for). In forced pause settings, we don't advertise pause and
+ asym_pause bits.
+
+ Failing this test means that .set_pauseparam in the MAC driver doesn't
+ forward to the PHY (in charge of advertising these bits) that we are in
+ fixed pause mode.
+ """
+
+ require_pause_supported_anyof(cfg, ["Pause", "Asym_Pause"])
+ require_controllable_lp(cfg)
+ pause_setup(cfg)
+
+ set_peer_pauseparams(cfg, True, True, True)
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ rx, tx = supported_pauseparams(cfg)
+
+ # Enable all possible pauseparams with pause autoneg
+ ret = set_local_pauseparams(cfg, rx, tx, True)
+ ksft_eq(ret, 0)
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ # Make sure we advertise them
+ ret, adv = get_local_pause_advertising(cfg)
+ ksft_eq(ret, 0)
+ ksft_eq(adv, pause_to_linkmodes(rx, tx))
+
+ # Disable pause autoneg
+ ret = set_local_pauseparams(cfg, rx, tx, False)
+ ksft_eq(ret, 0)
+
+ # This may trigger a link renegociation
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ # We shouldn't be advertising anything anymore
+ ret, adv = get_local_pause_advertising(cfg)
+ ksft_eq(ret, 0)
+ ksft_eq(adv, [])
+
+ # Validate on the LP that we aren't advertising anything
+ ret, adv = get_peer_pause_lp_advertising(cfg)
+ if ret == errno.EOPNOTSUPP:
+ return
+
+ ksft_eq(ret, 0)
+ ksft_eq(adv, [])
+
+@ksft_disruptive
+def pause_autoneg_state_params(cfg):
+ """Validate the pause params when transitioning between fixed pause
+ params and negotiated ones. The goal is to make sure that user
+ intent on the RX and TX pause params are stored when user decides
+ to use negotiated parameters instead. The main gotcha lies on the
+ fact that when pause autoneg is used, the autoneg result may differ
+ from the user intent.
+
+ Failing this test means the MAC driver is overwriting the user intent
+ when switching to forced pause.
+ """
+
+ require_pause_supported_allof(cfg, ["Pause", "Asym_Pause"])
+ require_controllable_lp(cfg)
+ require_peer_pause_supported_allof(cfg, ["Pause"])
+ require_link_autoneg(cfg)
+ pause_setup(cfg)
+
+ # Set peer user intent to RX on TX on, with Pause autoneg on
+ set_peer_pauseparams(cfg, 1, 1, True)
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ # Set the local intent to RX on TX off with pause autoneg
+ ksft_eq(set_local_pauseparams(cfg, 1, 0, True), 0)
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ check_local_pauseparams(cfg, True, 1, 0)
+ # Peer advertisiong Pause + Asym and us advertising Pause means we are
+ # actually using RX on TX on here, which is different than the intent.
+ check_local_advertising(cfg, ["Pause", "Asym_Pause"])
+ check_local_lp_advertising(cfg, ["Pause"])
+
+ # Disable pause autoneg
+ ksft_eq(set_local_pause_autoneg(cfg, False), 0)
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ # The pauseparams must still be what we configured before, and not the
+ # previously negotiated ones
+ check_local_pauseparams(cfg, False, 1, 0)
+
+ # Re-enable autoneg
+ ksft_eq(set_local_pause_autoneg(cfg, True), 0)
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ check_local_pauseparams(cfg, True, 1, 0)
+ # We must be advertising our intent again, and not RX on TX on, which would
+ # be "Pause" only.
+ check_local_advertising(cfg, ["Pause", "Asym_Pause"])
+ check_local_lp_advertising(cfg, ["Pause"])
+
+@ksft_disruptive
+def pause_autoneg_off_while_link_autoneg_on(cfg):
+ """ Validate that when link autoneg is on but pause autoneg is off, we do
+ not use negotiated pause parameters.
+
+ Failing this test means the MAC driver incorrectly accounts for the
+ negotiated pause parameters even with pause aneg off, likely due to
+ confusion between link autoneg and pause autoneg.
+ """
+
+ require_pause_supported_anyof(cfg, ["Pause", "Asym_Pause"])
+ require_controllable_lp(cfg)
+ require_peer_pause_supported_allof(cfg, ["Pause"])
+ require_link_autoneg(cfg)
+ pause_setup(cfg)
+
+ rx, tx = supported_pauseparams(cfg)
+
+ # Enable pause autoneg with all the locally supported modes enabled
+ set_peer_pauseparams(cfg, 1, 1, True)
+ ksft_eq(set_local_pauseparams(cfg, rx, tx, True), 0)
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ # Disable Pause autoneg
+ ksft_eq(set_local_pauseparams(cfg, rx, tx, False), 0)
+ ksft_eq(wait_for_aneg(cfg), True)
+ # Pause autoneg must read "disabled"
+ check_local_pauseparams(cfg, False, rx, tx)
+
+ set_peer_pauseparams(cfg, 0, 0, True)
+ ksft_eq(wait_for_aneg(cfg, link_drop=True), True)
+
+ ip(f"link set {cfg.remote_ifname} down", host=cfg.remote)
+ ip(f"link set {cfg.remote_ifname} up", host=cfg.remote)
+ ksft_eq(wait_for_aneg(cfg, link_drop=True), True)
+
+ # Pause autoneg must still be off even after a link renegotiation
+ check_local_pauseparams(cfg, False, rx, tx)
+
+@ksft_disruptive
+def pause_autoneg_link_autoneg(cfg):
+ """Validate pause autoneg and link autoneg interactions. The link autoneg's
+ admin status (i.e. do we autoneg link parameters or force them) must not
+ impact the pause autoneg status. While link autoneg is disabled, we don't
+ negotiate the pause params, however we must keep pause autoneg on as this
+ is the user intent. When link autoneg is re-enabled, pause params must be
+ derived from the negotiation.
+ """
+
+ require_pause_supported_anyof(cfg, ["Pause", "Asym_Pause"])
+ require_controllable_lp(cfg)
+ require_peer_pause_supported_allof(cfg, ["Pause"])
+ require_link_autoneg(cfg)
+ pause_setup(cfg)
+
+ rx, tx = supported_pauseparams(cfg)
+ adv = pause_to_linkmodes(rx, tx)
+
+ # Enable all possible pause modes and autoneg
+ set_peer_pauseparams(cfg, 1, 1, True)
+ ksft_eq(set_local_pauseparams(cfg, rx, tx, True), 0)
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ check_local_pauseparams(cfg, True, rx, tx)
+ check_local_advertising(cfg, adv)
+ check_local_lp_advertising(cfg, ["Pause"])
+
+ # Disable link autoneg, at the speed and duplex the link runs at
+ forced = forced_link_settings(cfg)
+ if not forced:
+ raise KsftSkipEx("Can't tell what to force the link at")
+
+ ret, _ = ethtool_ret(f"-s {cfg.remote_ifname} autoneg off {forced}",
+ is_get=False, host=cfg.remote)
+ if ret != 0:
+ raise KsftSkipEx(f"Can't force the peer's link at {forced}")
+
+ ret, _ = ethtool_ret(f"-s {cfg.ifname} autoneg off {forced}",
+ is_get=False)
+ if ret != 0:
+ raise KsftSkipEx(f"Can't force the link at {forced}")
+
+ if not wait_for_aneg(cfg):
+ raise KsftSkipEx(f"No link when forced at {forced}")
+
+ # We must have pause autoneg still enabled, even if we don't negotiate pause
+ check_local_pauseparams(cfg, True, rx, tx)
+
+ # Re-enable autoneg
+ ethtool(f"-s {cfg.remote_ifname} autoneg on", host=cfg.remote)
+ ethtool(f"-s {cfg.ifname} autoneg on")
+ ksft_eq(wait_for_aneg(cfg), True)
+
+ # Pause autoneg must still be on
+ check_local_pauseparams(cfg, True, rx, tx)
+ check_local_advertising(cfg, adv)
+ check_local_lp_advertising(cfg, ["Pause"])
+
def main():
with NetDrvEpEnv(__file__, nsim_test=False) as cfg:
cfg.ethnl = EthtoolFamily()
ksft_run([pause_test_support,
pause_advertising_test,
pause_aneg_resolution,
+ pause_autoneg_state_adv,
+ pause_autoneg_state_params,
+ pause_autoneg_off_while_link_autoneg_on,
+ pause_autoneg_link_autoneg,
],
args=(cfg, ))
ksft_exit()
--
2.55.0
^ permalink raw reply [flat|nested] 4+ messages in thread