This patch series introduces a new feature to netconsole which allows appending a message ID to the userdata dictionary.
If the msgid feature is enabled, the message ID is built from a per-target 32 bit counter that is incremented and appended to every message sent to the target.
Example:: echo 1 > "/sys/kernel/config/netconsole/cmdline0/userdata/msgid_enabled" echo "This is message #1" > /dev/kmsg echo "This is message #2" > /dev/kmsg 13,434,54928466,-;This is message #1 msgid=1 13,435,54934019,-;This is message #2 msgid=2
This feature can be used by the target to detect if messages were dropped or reordered before reaching the target. This allows system administrators to assess the reliability of their netconsole pipeline and detect loss of messages due to network contention or temporary unavailability.
Suggested-by: Breno Leitao leitao@debian.org Signed-off-by: Gustavo Luiz Duarte gustavold@gmail.com
Note to maintainer: This will conflict with a fix I sent recently to net:
c85bf1975108 netconsole: fix appending sysdata when sysdata_fields == SYSDATA_RELEASE
Please let me know if I should rebase at some point and send a v2.
--- Gustavo Luiz Duarte (5): netconsole: introduce 'msgid' as a new sysdata field netconsole: implement configfs for msgid_enabled netconsole: append msgid to sysdata selftests: netconsole: Add tests for 'msgid' feature in sysdata docs: netconsole: document msgid feature
Documentation/networking/netconsole.rst | 22 +++++++ drivers/net/netconsole.c | 67 +++++++++++++++++++++- .../selftests/drivers/net/netcons_sysdata.sh | 30 ++++++++++ 3 files changed, 118 insertions(+), 1 deletion(-) --- base-commit: 0097c4195b1d0ca57d15979626c769c74747b5a0 change-id: 20250609-netconsole-msgid-b93c6f8e9c60
Best regards,