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i40e: Restore VF MSI-X state during PCI reset

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[ 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: 19b7960b2d ("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>
This commit is contained in:
Andrii Staikov 2023-12-21 14:27:35 +01:00 committed by Greg Kroah-Hartman
parent 01c2d73ae2
commit 863ca421b4
3 changed files with 32 additions and 0 deletions
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3
drivers/net/ethernet/intel/i40e/i40e_main.c
View File

@ -15716,6 +15716,9 @@ static void i40e_pci_error_reset_done(struct pci_dev *pdev)
struct i40e_pf *pf = pci_get_drvdata(pdev);
i40e_reset_and_rebuild(pf, false, false);
#ifdef CONFIG_PCI_IOV
i40e_restore_all_vfs_msi_state(pdev);
#endif /* CONFIG_PCI_IOV */
}
/**

26
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
View File

@ -99,6 +99,32 @@ void i40e_vc_notify_reset(struct i40e_pf *pf)
(u8 *)&pfe, sizeof(struct virtchnl_pf_event));
}
#ifdef CONFIG_PCI_IOV
void i40e_restore_all_vfs_msi_state(struct pci_dev *pdev)
{
u16 vf_id;
u16 pos;
/* Continue only if this is a PF */
if (!pdev->is_physfn)
return;
if (!pci_num_vf(pdev))
return;
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
if (pos) {
struct pci_dev *vf_dev = NULL;
pci_read_config_word(pdev, pos + PCI_SRIOV_VF_DID, &vf_id);
while ((vf_dev = pci_get_device(pdev->vendor, vf_id, vf_dev))) {
if (vf_dev->is_virtfn && vf_dev->physfn == pdev)
pci_restore_msi_state(vf_dev);
}
}
}
#endif /* CONFIG_PCI_IOV */
/**
* i40e_vc_notify_vf_reset
* @vf: pointer to the VF structure

3
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h
View File

@ -141,5 +141,8 @@ int i40e_ndo_set_vf_spoofchk(struct net_device *netdev, int vf_id, bool enable);
void i40e_vc_notify_link_state(struct i40e_pf *pf);
void i40e_vc_notify_reset(struct i40e_pf *pf);
#ifdef CONFIG_PCI_IOV
void i40e_restore_all_vfs_msi_state(struct pci_dev *pdev);
#endif /* CONFIG_PCI_IOV */
#endif /* _I40E_VIRTCHNL_PF_H_ */