linux-kernel - [PATCH net-next v2 0/6] netconsole: support automatic target recovery

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Message-Id: <20250921-netcons-retrigger-v2-0-a0e84006237f@gmail.com>
Date: Sun, 21 Sep 2025 22:55:40 +0100
From: Andre Carvalho <asantostc@...il.com>
To: Breno Leitao <leitao@...ian.org>, Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Shuah Khan <shuah@...nel.org>, Simon Horman <horms@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, Andre Carvalho <asantostc@...il.com>
Subject: [PATCH net-next v2 0/6] netconsole: support automatic target
 recovery

This patchset introduces target resume capability to netconsole allowing
it to recover targets when underlying low-level interface comes back
online.

The patchset starts by refactoring netconsole state representation in
order to allow representing deactivated targets (targets that are
disabled due to interfaces going down). It then modifies netconsole to
handle NETDEV_UP events for such targets and setups netpoll.

The patchset includes a selftest that validates netconsole target state
transitions and that target is functional after resumed.

Signed-off-by: Andre Carvalho <asantostc@...il.com>
---
Changes in v2:
- Attempt to resume target in the same thread, instead of using
workqueue .
- Add wrapper around __netpoll_setup (patch 4).
- Renamed resume_target to maybe_resume_target and moved conditionals to
inside its implementation, keeping code more clear.
- Verify that device addr matches target mac address when target was
setup using mac.
- Update selftest to cover targets bound by mac and interface name.
- Fix typo in selftest comment and sort tests alphabetically in
  Makefile.
- Link to v1:
https://lore.kernel.org/r/20250909-netcons-retrigger-v1-0-3aea904926cf@gmail.com

---
Andre Carvalho (4):
      netconsole: convert 'enabled' flag to enum for clearer state management
      netpoll: add wrapper around __netpoll_setup with dev reference
      netconsole: resume previously deactivated target
      selftests: netconsole: validate target reactivation

Breno Leitao (2):
      netconsole: add target_state enum
      netconsole: add STATE_DEACTIVATED to track targets disabled by low level

 drivers/net/netconsole.c                           | 102 +++++++++++++++------
 include/linux/netpoll.h                            |   1 +
 net/core/netpoll.c                                 |  20 ++++
 tools/testing/selftests/drivers/net/Makefile       |   1 +
 .../selftests/drivers/net/lib/sh/lib_netcons.sh    |  30 +++++-
 .../selftests/drivers/net/netcons_resume.sh        |  92 +++++++++++++++++++
 6 files changed, 216 insertions(+), 30 deletions(-)
---
base-commit: 312e6f7676e63bbb9b81e5c68e580a9f776cc6f0
change-id: 20250816-netcons-retrigger-a4f547bfc867

Best regards,
-- 
Andre Carvalho <asantostc@...il.com>