netdev - [PATCH iwl-net V3,2/2] i40e: Fully suspend and resume IO operations in EEH case

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Message-Id: <20240514202141.408-3-thinhtr@linux.ibm.com>
Date: Tue, 14 May 2024 15:21:41 -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,
        horms@...nel.org
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 V3,2/2] i40e: Fully suspend and resume IO operations in EEH case

When EEH events occurs, the callback functions in the i40e, which are
managed by the EEH driver, will completely suspend and resume all IO
operations.

- 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

Fixes: a5f3d2c17b07 ("powerpc/pseries/pci: Add MSI domains")
Tested-by: Robert Thomas <rob.thomas@....com>
Signed-off-by: Thinh Tran <thinhtr@...ux.ibm.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 281c8ec27af2..9f71a61e0c52 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -11138,6 +11138,8 @@ static void i40e_reset_and_rebuild(struct i40e_pf *pf, bool reinit,
 	ret = i40e_reset(pf);
 	if (!ret)
 		i40e_rebuild(pf, reinit, lock_acquired);
+	else
+		dev_err(&pf->pdev->dev, "%s: i40e_reset() FAILED", __func__);
 }
 
 /**
@@ -16459,7 +16461,7 @@ static pci_ers_result_t i40e_pci_error_detected(struct pci_dev *pdev,
 
 	/* shutdown all operations */
 	if (!test_bit(__I40E_SUSPENDED, pf->state))
-		i40e_prep_for_reset(pf);
+		i40e_io_suspend(pf);
 
 	/* Request a slot reset */
 	return PCI_ERS_RESULT_NEED_RESET;
@@ -16481,7 +16483,8 @@ static pci_ers_result_t i40e_pci_error_slot_reset(struct pci_dev *pdev)
 	u32 reg;
 
 	dev_dbg(&pdev->dev, "%s\n", __func__);
-	if (pci_enable_device_mem(pdev)) {
+	/* enable I/O and memory of the device  */
+	if (pci_enable_device(pdev)) {
 		dev_info(&pdev->dev,
 			 "Cannot re-enable PCI device after reset.\n");
 		result = PCI_ERS_RESULT_DISCONNECT;
@@ -16544,7 +16547,7 @@ static void i40e_pci_error_resume(struct pci_dev *pdev)
 	if (test_bit(__I40E_SUSPENDED, pf->state))
 		return;
 
-	i40e_handle_reset_warning(pf, false);
+	i40e_io_resume(pf);
 }
 
 /**
-- 
2.25.1