mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 01:05:08 +07:00
c39d0454ec
Since CHANGEUPPER can now fail, add support for it in the newly introduced netdev notifier error injection infrastructure. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
125 lines
4.0 KiB
Plaintext
125 lines
4.0 KiB
Plaintext
Notifier error injection
|
|
========================
|
|
|
|
Notifier error injection provides the ability to inject artificial errors to
|
|
specified notifier chain callbacks. It is useful to test the error handling of
|
|
notifier call chain failures which is rarely executed. There are kernel
|
|
modules that can be used to test the following notifiers.
|
|
|
|
* CPU notifier
|
|
* PM notifier
|
|
* Memory hotplug notifier
|
|
* powerpc pSeries reconfig notifier
|
|
* Netdevice notifier
|
|
|
|
CPU notifier error injection module
|
|
-----------------------------------
|
|
This feature can be used to test the error handling of the CPU notifiers by
|
|
injecting artificial errors to CPU notifier chain callbacks.
|
|
|
|
If the notifier call chain should be failed with some events notified, write
|
|
the error code to debugfs interface
|
|
/sys/kernel/debug/notifier-error-inject/cpu/actions/<notifier event>/error
|
|
|
|
Possible CPU notifier events to be failed are:
|
|
|
|
* CPU_UP_PREPARE
|
|
* CPU_UP_PREPARE_FROZEN
|
|
* CPU_DOWN_PREPARE
|
|
* CPU_DOWN_PREPARE_FROZEN
|
|
|
|
Example1: Inject CPU offline error (-1 == -EPERM)
|
|
|
|
# cd /sys/kernel/debug/notifier-error-inject/cpu
|
|
# echo -1 > actions/CPU_DOWN_PREPARE/error
|
|
# echo 0 > /sys/devices/system/cpu/cpu1/online
|
|
bash: echo: write error: Operation not permitted
|
|
|
|
Example2: inject CPU online error (-2 == -ENOENT)
|
|
|
|
# echo -2 > actions/CPU_UP_PREPARE/error
|
|
# echo 1 > /sys/devices/system/cpu/cpu1/online
|
|
bash: echo: write error: No such file or directory
|
|
|
|
PM notifier error injection module
|
|
----------------------------------
|
|
This feature is controlled through debugfs interface
|
|
/sys/kernel/debug/notifier-error-inject/pm/actions/<notifier event>/error
|
|
|
|
Possible PM notifier events to be failed are:
|
|
|
|
* PM_HIBERNATION_PREPARE
|
|
* PM_SUSPEND_PREPARE
|
|
* PM_RESTORE_PREPARE
|
|
|
|
Example: Inject PM suspend error (-12 = -ENOMEM)
|
|
|
|
# cd /sys/kernel/debug/notifier-error-inject/pm/
|
|
# echo -12 > actions/PM_SUSPEND_PREPARE/error
|
|
# echo mem > /sys/power/state
|
|
bash: echo: write error: Cannot allocate memory
|
|
|
|
Memory hotplug notifier error injection module
|
|
----------------------------------------------
|
|
This feature is controlled through debugfs interface
|
|
/sys/kernel/debug/notifier-error-inject/memory/actions/<notifier event>/error
|
|
|
|
Possible memory notifier events to be failed are:
|
|
|
|
* MEM_GOING_ONLINE
|
|
* MEM_GOING_OFFLINE
|
|
|
|
Example: Inject memory hotplug offline error (-12 == -ENOMEM)
|
|
|
|
# cd /sys/kernel/debug/notifier-error-inject/memory
|
|
# echo -12 > actions/MEM_GOING_OFFLINE/error
|
|
# echo offline > /sys/devices/system/memory/memoryXXX/state
|
|
bash: echo: write error: Cannot allocate memory
|
|
|
|
powerpc pSeries reconfig notifier error injection module
|
|
--------------------------------------------------------
|
|
This feature is controlled through debugfs interface
|
|
/sys/kernel/debug/notifier-error-inject/pSeries-reconfig/actions/<notifier event>/error
|
|
|
|
Possible pSeries reconfig notifier events to be failed are:
|
|
|
|
* PSERIES_RECONFIG_ADD
|
|
* PSERIES_RECONFIG_REMOVE
|
|
* PSERIES_DRCONF_MEM_ADD
|
|
* PSERIES_DRCONF_MEM_REMOVE
|
|
|
|
Netdevice notifier error injection module
|
|
----------------------------------------------
|
|
This feature is controlled through debugfs interface
|
|
/sys/kernel/debug/notifier-error-inject/netdev/actions/<notifier event>/error
|
|
|
|
Netdevice notifier events which can be failed are:
|
|
|
|
* NETDEV_REGISTER
|
|
* NETDEV_CHANGEMTU
|
|
* NETDEV_CHANGENAME
|
|
* NETDEV_PRE_UP
|
|
* NETDEV_PRE_TYPE_CHANGE
|
|
* NETDEV_POST_INIT
|
|
* NETDEV_PRECHANGEMTU
|
|
* NETDEV_PRECHANGEUPPER
|
|
* NETDEV_CHANGEUPPER
|
|
|
|
Example: Inject netdevice mtu change error (-22 == -EINVAL)
|
|
|
|
# cd /sys/kernel/debug/notifier-error-inject/netdev
|
|
# echo -22 > actions/NETDEV_CHANGEMTU/error
|
|
# ip link set eth0 mtu 1024
|
|
RTNETLINK answers: Invalid argument
|
|
|
|
For more usage examples
|
|
-----------------------
|
|
There are tools/testing/selftests using the notifier error injection features
|
|
for CPU and memory notifiers.
|
|
|
|
* tools/testing/selftests/cpu-hotplug/on-off-test.sh
|
|
* tools/testing/selftests/memory-hotplug/on-off-test.sh
|
|
|
|
These scripts first do simple online and offline tests and then do fault
|
|
injection tests if notifier error injection module is available.
|