netdev - [PATCH net-next 00/14] mlxsw: Add support for new reset flow

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Date: Wed, 15 Nov 2023 13:17:09 +0100
From: Petr Machata <petrm@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, <netdev@...r.kernel.org>
CC: Ido Schimmel <idosch@...dia.com>, Petr Machata <petrm@...dia.com>, "Amit
 Cohen" <amcohen@...dia.com>, <mlxsw@...dia.com>
Subject: [PATCH net-next 00/14] mlxsw: Add support for new reset flow

Ido Schimmel writes:

This patchset changes mlxsw to issue a PCI reset during probe and
devlink reload so that the PCI firmware could be upgraded without a
reboot.

Unlike the old version of this patchset [1], in this version the driver
no longer tries to issue a PCI reset by triggering a PCI link toggle on
its own, but instead calls the PCI core to issue the reset.

The PCI APIs require the device lock to be held which is why patches
#1-#6 adjust devlink to acquire the device lock during reload.

Patches #7 adds reset method quirk for NVIDIA Spectrum devices.

Patch #8 adds a debug level print in PCI core so that device ready delay
will be printed even if it is shorter than one second.

Patches #9-#11 are straightforward preparations in mlxsw.

Patch #12 finally implements the new reset flow in mlxsw.

Patch #13 adds PCI reset handlers in mlxsw to avoid user space from
resetting the device from underneath an unaware driver. Instead, the
driver is gracefully de-initialized before the PCI reset and then
initialized again after it.

Patch #14 adds a PCI reset selftest to make sure this code path does not
regress.

[1] https://lore.kernel.org/netdev/cover.1679502371.git.petrm@nvidia.com/

Amit Cohen (3):
  mlxsw: Extend MRSR pack() function to support new commands
  mlxsw: pci: Rename mlxsw_pci_sw_reset()
  mlxsw: pci: Move software reset code to a separate function

Ido Schimmel (11):
  devlink: Move private netlink flags to C file
  devlink: Acquire device lock during netns dismantle
  devlink: Enable the use of private flags in post_doit operations
  devlink: Allow taking device lock in pre_doit operations
  devlink: Acquire device lock during reload command
  devlink: Add device lock assert in reload operation
  PCI: Add no PM reset quirk for NVIDIA Spectrum devices
  PCI: Add debug print for device ready delay
  mlxsw: pci: Add support for new reset flow
  mlxsw: pci: Implement PCI reset handlers
  selftests: mlxsw: Add PCI reset test

 Documentation/netlink/specs/devlink.yaml      |  4 +-
 drivers/net/ethernet/mellanox/mlxsw/pci.c     | 90 +++++++++++++++++--
 drivers/net/ethernet/mellanox/mlxsw/reg.h     | 16 +++-
 drivers/pci/pci.c                             |  3 +
 drivers/pci/quirks.c                          | 13 +++
 net/devlink/core.c                            |  4 +-
 net/devlink/dev.c                             |  8 ++
 net/devlink/devl_internal.h                   | 21 ++++-
 net/devlink/health.c                          |  3 +-
 net/devlink/netlink.c                         | 47 +++++++---
 net/devlink/netlink_gen.c                     |  4 +-
 net/devlink/netlink_gen.h                     |  5 ++
 net/devlink/region.c                          |  3 +-
 .../selftests/drivers/net/mlxsw/pci_reset.sh  | 58 ++++++++++++
 14 files changed, 248 insertions(+), 31 deletions(-)
 create mode 100755 tools/testing/selftests/drivers/net/mlxsw/pci_reset.sh

-- 
2.41.0