netdev - [PATCH iwl-net V2,0/2] Fix repeated EEH reports in MSI domain

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Date: Mon, 13 May 2024 12:55:47 -0500
From: Thinh Tran <thinhtr@...ux.ibm.com>
To: netdev@...r.kernel.org, kuba@...nel.org, anthony.l.nguyen@...el.com,
        aleksandr.loktionov@...el.com, przemyslaw.kitszel@...el.com
Cc: jesse.brandeburg@...el.com, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, intel-wired-lan@...ts.osuosl.org,
        rob.thomas@....com, Thinh Tran <thinhtr@...ux.ibm.com>
Subject: [PATCH iwl-net V2,0/2] Fix repeated EEH reports in MSI domain

The patch fixes an issue where repeated EEH reports with a single error
on the bus of Intel X710 4-port 10G Base-T adapter in the MSI domain
causes the device to be permanently disabled.  It fully resets and
restarts the device when handling the PCI EEH error.

Two new functions, i40e_io_suspend() and i40e_io_resume(), have been
introduced.  These functions were factored out from the existing
i40e_suspend() and i40e_resume() respectively.  This factoring was
done due to concerns about the logic of the I40E_SUSPENSED state, which
caused the device not able to recover.  The functions are now used in the
EEH handling for device suspend/resume callbacks.

- In the PCI error detected callback, replaced i40e_prep_for_reset()
  with i40e_io_suspend(). The change is to fully suspend all I/O
  operations
- In the PCI error slot reset callback, replaced pci_enable_device_mem()
  with pci_enable_device(). This change enables both I/O and memory of 
  the device.
- In the PCI error resume callback, replaced i40e_handle_reset_warning()
  with i40e_io_resume(). This change allows the system to resume I/O 
  operations

v2: fixed typos and split into two commits

Thinh Tran (2):
  i40e: fractoring out i40e_suspend/i40e_resume
  i40e: Fully suspend and resume IO operations in EEH case

 drivers/net/ethernet/intel/i40e/i40e_main.c | 257 +++++++++++---------
 1 file changed, 140 insertions(+), 117 deletions(-)

-- 
2.25.1