linux-kernel - [PATCH net-next v2 00/10] Convert mlx4 to use auxiliary bus

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Message-Id: <20230813145127.10653-1-petr.pavlu@suse.com>
Date:   Sun, 13 Aug 2023 16:51:17 +0200
From:   Petr Pavlu <petr.pavlu@...e.com>
To:     tariqt@...dia.com, yishaih@...dia.com, leon@...nel.org
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, jgg@...pe.ca, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Petr Pavlu <petr.pavlu@...e.com>
Subject: [PATCH net-next v2 00/10] Convert mlx4 to use auxiliary bus

This series converts the mlx4 drivers to use auxiliary bus, similarly to
how mlx5 was converted [1]. The first 6 patches are preparatory changes,
the remaining 4 are the final conversion.

Initial motivation for this change was to address a problem related to
loading mlx4_en/mlx4_ib by mlx4_core using request_module_nowait(). When
doing such a load in initrd, the operation is asynchronous to any init
control and can get unexpectedly affected/interrupted by an eventual
root switch. Using an auxiliary bus leaves these module loads to udevd
which better integrates with systemd processing. [2]

General benefit is to get rid of custom interface logic and instead use
a common facility available for this task. An obvious risk is that some
new bug is introduced by the conversion.

Leon Romanovsky was kind enough to check for me that the series passes
their verification tests.

Changes since v1 [3]:
* Fix a missing definition of the err variable in mlx4_en_add().
* Remove not needed comments about the event type in mlx4_en_event()
  and mlx4_ib_event().

[1] https://lore.kernel.org/netdev/20201101201542.2027568-1-leon@kernel.org/
[2] https://lore.kernel.org/netdev/0a361ac2-c6bd-2b18-4841-b1b991f0635e@suse.com/
[3] https://lore.kernel.org/netdev/20230804150527.6117-1-petr.pavlu@suse.com/

Petr Pavlu (10):
  mlx4: Get rid of the mlx4_interface.get_dev callback
  mlx4: Rename member mlx4_en_dev.nb to netdev_nb
  mlx4: Replace the mlx4_interface.event callback with a notifier
  mlx4: Get rid of the mlx4_interface.activate callback
  mlx4: Move the bond work to the core driver
  mlx4: Avoid resetting MLX4_INTFF_BONDING per driver
  mlx4: Register mlx4 devices to an auxiliary virtual bus
  mlx4: Connect the ethernet part to the auxiliary bus
  mlx4: Connect the infiniband part to the auxiliary bus
  mlx4: Delete custom device management logic

 drivers/infiniband/hw/mlx4/main.c             | 207 ++++++----
 drivers/infiniband/hw/mlx4/mlx4_ib.h          |   2 +
 drivers/net/ethernet/mellanox/mlx4/Kconfig    |   1 +
 drivers/net/ethernet/mellanox/mlx4/en_main.c  | 141 ++++---
 .../net/ethernet/mellanox/mlx4/en_netdev.c    |  64 +---
 drivers/net/ethernet/mellanox/mlx4/intf.c     | 361 ++++++++++++------
 drivers/net/ethernet/mellanox/mlx4/main.c     | 110 ++++--
 drivers/net/ethernet/mellanox/mlx4/mlx4.h     |  16 +-
 drivers/net/ethernet/mellanox/mlx4/mlx4_en.h  |   4 +-
 include/linux/mlx4/device.h                   |  20 +
 include/linux/mlx4/driver.h                   |  42 +-
 11 files changed, 572 insertions(+), 396 deletions(-)

base-commit: 2f4503f94c5d81d1589842bfb457be466c8c670b
-- 
2.35.3