[Intel-wired-lan] [PATCH net v1 0/2] Fix close path on shutdown and remove in iavf driver.

[Intel-wired-lan] [PATCH net v1 0/2] Fix close path on shutdown and remove in iavf driver.

[Mateusz Palczewski]

iavf_shutdown was implementing an incomplete version
of iavf_remove. It misses several calls to the kernel like
iavf_free_misc_irq, iavf_reset_interrupt_capability, iounmap
that might break the system on reboot or hibernation.

Fix a deadlock introduced by commit
974578017fc1f ("iavf: Add waiting so the port is initialized in remove")
due to race condition between iavf_shutdown and iavf_remove, where
iavf_remove stucks forever in while loop since iavf_shutdown already
set __IAVF_REMOVE adapter state.

SlawomirX Laba (2):
  iavf: Fix shutdown pci callback to match the remove one
  iavf: Fix race condition between iavf_shutdown and iavf_remove

 drivers/net/ethernet/intel/iavf/iavf_main.c | 59 ++++++++-------------
 1 file changed, 22 insertions(+), 37 deletions(-)

-- 
2.27.0

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[Intel-wired-lan] [PATCH net v1 1/2] iavf: Fix shutdown pci callback to match the remove one

[Mateusz Palczewski]

From: SlawomirX Laba <slawomirx.laba@intel.com>

Make the flow for pci shutdown be the same to the pci remove.

iavf_shutdown was implementing an incomplete version
of iavf_remove. It misses several calls  to the kernel like
iavf_free_misc_irq, iavf_reset_interrupt_capability, iounmap
that might break the system on reboot or hibernation.

Implement the call of iavf_remove directly in iavf_shutdown to
close this gap.

Fixes: 5eae00c57f5e ("i40evf: main driver core")
Signed-off-by: Slawomir Laba <slawomirx.laba@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 40 +++++++--------------
 1 file changed, 12 insertions(+), 28 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index f3ecb3bca33d..74be5e3a09df 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -4545,34 +4545,6 @@ int iavf_process_config(struct iavf_adapter *adapter)
 	return 0;
 }
 
-/**
- * iavf_shutdown - Shutdown the device in preparation for a reboot
- * @pdev: pci device structure
- **/
-static void iavf_shutdown(struct pci_dev *pdev)
-{
-	struct iavf_adapter *adapter = iavf_pdev_to_adapter(pdev);
-	struct net_device *netdev = adapter->netdev;
-
-	netif_device_detach(netdev);
-
-	if (netif_running(netdev))
-		iavf_close(netdev);
-
-	if (iavf_lock_timeout(&adapter->crit_lock, 5000))
-		dev_warn(&adapter->pdev->dev, "failed to acquire crit_lock in %s\n", __FUNCTION__);
-	/* Prevent the watchdog from running. */
-	iavf_change_state(adapter, __IAVF_REMOVE);
-	adapter->aq_required = 0;
-	mutex_unlock(&adapter->crit_lock);
-
-#ifdef CONFIG_PM
-	pci_save_state(pdev);
-
-#endif
-	pci_disable_device(pdev);
-}
-
 /**
  * iavf_probe - Device Initialization Routine
  * @pdev: PCI device information struct
@@ -4909,6 +4881,18 @@ static void iavf_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
+/**
+ * iavf_shutdown - Shutdown the device in preparation for a reboot
+ * @pdev: pci device structure
+ **/
+static void iavf_shutdown(struct pci_dev *pdev)
+{
+	iavf_remove(pdev);
+
+	if (system_state == SYSTEM_POWER_OFF)
+		pci_set_power_state(pdev, PCI_D3hot);
+}
+
 static SIMPLE_DEV_PM_OPS(iavf_pm_ops, iavf_suspend, iavf_resume);
 
 static struct pci_driver iavf_driver = {
-- 
2.27.0

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Re: [Intel-wired-lan] [PATCH net v1 1/2] iavf: Fix shutdown pci callback to match the remove one

[Tony Nguyen]

On 7/6/2022 6:54 AM, Mateusz Palczewski wrote:
> From: SlawomirX Laba <slawomirx.laba@intel.com>

From:/Signed-off-by: email name mismatch: 'From: SlawomirX Laba 
<slawomirx.laba@intel.com>' != 'Signed-off-by: Slawomir Laba 
<slawomirx.laba@intel.com>'

> Make the flow for pci shutdown be the same to the pci remove.
> 
> iavf_shutdown was implementing an incomplete version
> of iavf_remove. It misses several calls  to the kernel like
> iavf_free_misc_irq, iavf_reset_interrupt_capability, iounmap
> that might break the system on reboot or hibernation.
> 
> Implement the call of iavf_remove directly in iavf_shutdown to
> close this gap.
> 
> Fixes: 5eae00c57f5e ("i40evf: main driver core")
> Signed-off-by: Slawomir Laba <slawomirx.laba@intel.com>
> Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>

Same issue for patch 2.
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[Intel-wired-lan] [PATCH net v1 2/2] iavf: Fix race condition between iavf_shutdown and iavf_remove

[Mateusz Palczewski]

From: SlawomirX Laba <slawomirx.laba@intel.com>

Fix a deadlock introduced by commit
974578017fc1 ("iavf: Add waiting so the port is initialized in remove")
due to race condition between iavf_shutdown and iavf_remove, where
iavf_remove stucks forever in while loop since iavf_shutdown already
set __IAVF_REMOVE adapter state.

Fix this by checking if the __IAVF_IN_REMOVE_TASK has already been
set and return if so.

Fixes: 974578017fc1 ("iavf: Add waiting so the port is initialized in remove")
Signed-off-by: Slawomir Laba <slawomirx.laba@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 74be5e3a09df..d0889fe24b9e 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -4744,23 +4744,24 @@ static int __maybe_unused iavf_resume(struct device *dev_d)
 static void iavf_remove(struct pci_dev *pdev)
 {
 	struct iavf_adapter *adapter = iavf_pdev_to_adapter(pdev);
-	struct net_device *netdev = adapter->netdev;
 	struct iavf_fdir_fltr *fdir, *fdirtmp;
 	struct iavf_vlan_filter *vlf, *vlftmp;
+	struct iavf_cloud_filter *cf, *cftmp;
 	struct iavf_adv_rss *rss, *rsstmp;
 	struct iavf_mac_filter *f, *ftmp;
-	struct iavf_cloud_filter *cf, *cftmp;
-	struct iavf_hw *hw = &adapter->hw;
+	struct net_device *netdev;
+	struct iavf_hw *hw;
 	int err;
 
-	/* When reboot/shutdown is in progress no need to do anything
-	 * as the adapter is already REMOVE state that was set during
-	 * iavf_shutdown() callback.
-	 */
-	if (adapter->state == __IAVF_REMOVE)
+	if (!adapter)
+		return;
+
+	netdev = adapter->netdev;
+	hw = &adapter->hw;
+
+	if (test_and_set_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section))
 		return;
 
-	set_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section);
 	/* Wait until port initialization is complete.
 	 * There are flows where register/unregister netdev may race.
 	 */
-- 
2.27.0

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