i40e: Restore VF MSI-X state during PCI reset
authorAndrii Staikov <andrii.staikov@intel.com>
Thu, 21 Dec 2023 13:27:35 +0000 (14:27 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 10 Jan 2024 16:16:52 +0000 (17:16 +0100)
commit17f5cfeb15d683d2481498b26b0ed1c4e86380c1
treed6c38ae76db6f6fb90ccb00f6cde360a2c35e154
parent1ee4eb8024eec36d134337e769e14c800bcacaad
i40e: Restore VF MSI-X state during PCI reset

[ Upstream commit 371e576ff3e8580d91d49026e5d5faebf5565558 ]

During a PCI FLR the MSI-X Enable flag in the VF PCI MSI-X capability
register will be cleared. This can lead to issues when a VF is
assigned to a VM because in these cases the VF driver receives no
indication of the PF PCI error/reset and additionally it is incapable
of restoring the cleared flag in the hypervisor configuration space
without fully reinitializing the driver interrupt functionality.

Since the VF driver is unable to easily resolve this condition on its own,
restore the VF MSI-X flag during the PF PCI reset handling.

Fixes: 19b7960b2da1 ("i40e: implement split PCI error reset handler")
Co-developed-by: Karen Ostrowska <karen.ostrowska@intel.com>
Signed-off-by: Karen Ostrowska <karen.ostrowska@intel.com>
Co-developed-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Andrii Staikov <andrii.staikov@intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/net/ethernet/intel/i40e/i40e_main.c
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h