[PATCH net-next 0/3][pull request] 40GbE Intel Wired LAN Driver Updates 2021-10-18

[PATCH net-next 0/3][pull request] 40GbE Intel Wired LAN Driver Updates 2021-10-18

[Tony Nguyen]

Mateusz Palczewski says:

Use single state machine for driver initialization
and for service initialized driver. The init state
machine implemented in init_task() is merged
into the watchdog_task(). The init_task() function
is removed.

The following are changes since commit 041c61488236a5a84789083e3d9f0a51139b6edf:
  sfc: Fix reading non-legacy supported link modes
and are available in the git repository at:
  git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue 40GbE

Mateusz Palczewski (3):
  iavf: Refactor iavf state machine tracking
  iavf: Add __IAVF_INIT_FAILED state
  iavf: Combine init and watchdog state machines

 drivers/net/ethernet/intel/iavf/iavf.h        |  12 +-
 drivers/net/ethernet/intel/iavf/iavf_main.c   | 192 ++++++++----------
 .../net/ethernet/intel/iavf/iavf_virtchnl.c   |   2 +-
 3 files changed, 101 insertions(+), 105 deletions(-)

-- 
2.31.1

[PATCH net-next 1/3] iavf: Refactor iavf state machine tracking

[Tony Nguyen]

From: Mateusz Palczewski <mateusz.palczewski@intel.com>

Replace state changes of iavf state machine
with a method that also tracks the previous
state the machine was on.

This change is required for further work with
refactoring init and watchdog state machines.

Tracking of previous state would help us
recover iavf after failure has occurred.

Signed-off-by: Jakub Pawlak <jakub.pawlak@intel.com>
Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/iavf/iavf.h        | 10 +++++
 drivers/net/ethernet/intel/iavf/iavf_main.c   | 37 ++++++++++---------
 .../net/ethernet/intel/iavf/iavf_virtchnl.c   |  2 +-
 3 files changed, 31 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index 68c80f04113c..cd359cfe5cce 100644
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -312,6 +312,7 @@ struct iavf_adapter {
 	struct iavf_hw hw; /* defined in iavf_type.h */
 
 	enum iavf_state_t state;
+	enum iavf_state_t last_state;
 	unsigned long crit_section;
 
 	struct delayed_work watchdog_task;
@@ -393,6 +394,15 @@ struct iavf_device {
 extern char iavf_driver_name[];
 extern struct workqueue_struct *iavf_wq;
 
+static inline void iavf_change_state(struct iavf_adapter *adapter,
+				     enum iavf_state_t state)
+{
+	if (adapter->state != state) {
+		adapter->last_state = adapter->state;
+		adapter->state = state;
+	}
+}
+
 int iavf_up(struct iavf_adapter *adapter);
 void iavf_down(struct iavf_adapter *adapter);
 int iavf_process_config(struct iavf_adapter *adapter);
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index ca4712a73574..3df018c879e1 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -960,7 +960,7 @@ static void iavf_configure(struct iavf_adapter *adapter)
  **/
 static void iavf_up_complete(struct iavf_adapter *adapter)
 {
-	adapter->state = __IAVF_RUNNING;
+	iavf_change_state(adapter, __IAVF_RUNNING);
 	clear_bit(__IAVF_VSI_DOWN, adapter->vsi.state);
 
 	iavf_napi_enable_all(adapter);
@@ -1729,7 +1729,7 @@ static int iavf_startup(struct iavf_adapter *adapter)
 		iavf_shutdown_adminq(hw);
 		goto err;
 	}
-	adapter->state = __IAVF_INIT_VERSION_CHECK;
+	iavf_change_state(adapter, __IAVF_INIT_VERSION_CHECK);
 err:
 	return err;
 }
@@ -1753,7 +1753,7 @@ static int iavf_init_version_check(struct iavf_adapter *adapter)
 	if (!iavf_asq_done(hw)) {
 		dev_err(&pdev->dev, "Admin queue command never completed\n");
 		iavf_shutdown_adminq(hw);
-		adapter->state = __IAVF_STARTUP;
+		iavf_change_state(adapter, __IAVF_STARTUP);
 		goto err;
 	}
 
@@ -1776,8 +1776,7 @@ static int iavf_init_version_check(struct iavf_adapter *adapter)
 			err);
 		goto err;
 	}
-	adapter->state = __IAVF_INIT_GET_RESOURCES;
-
+	iavf_change_state(adapter, __IAVF_INIT_GET_RESOURCES);
 err:
 	return err;
 }
@@ -1893,7 +1892,7 @@ static int iavf_init_get_resources(struct iavf_adapter *adapter)
 	if (netdev->features & NETIF_F_GRO)
 		dev_info(&pdev->dev, "GRO is enabled\n");
 
-	adapter->state = __IAVF_DOWN;
+	iavf_change_state(adapter, __IAVF_DOWN);
 	set_bit(__IAVF_VSI_DOWN, adapter->vsi.state);
 	rtnl_unlock();
 
@@ -1941,7 +1940,7 @@ static void iavf_watchdog_task(struct work_struct *work)
 		goto restart_watchdog;
 
 	if (adapter->flags & IAVF_FLAG_PF_COMMS_FAILED)
-		adapter->state = __IAVF_COMM_FAILED;
+		iavf_change_state(adapter, __IAVF_COMM_FAILED);
 
 	switch (adapter->state) {
 	case __IAVF_COMM_FAILED:
@@ -1952,7 +1951,7 @@ static void iavf_watchdog_task(struct work_struct *work)
 			/* A chance for redemption! */
 			dev_err(&adapter->pdev->dev,
 				"Hardware came out of reset. Attempting reinit.\n");
-			adapter->state = __IAVF_STARTUP;
+			iavf_change_state(adapter, __IAVF_STARTUP);
 			adapter->flags &= ~IAVF_FLAG_PF_COMMS_FAILED;
 			queue_delayed_work(iavf_wq, &adapter->init_task, 10);
 			mutex_unlock(&adapter->crit_lock);
@@ -1999,9 +1998,10 @@ static void iavf_watchdog_task(struct work_struct *work)
 		goto restart_watchdog;
 	}
 
-		/* check for hw reset */
+	/* check for hw reset */
 	reg_val = rd32(hw, IAVF_VF_ARQLEN1) & IAVF_VF_ARQLEN1_ARQENABLE_MASK;
 	if (!reg_val) {
+		iavf_change_state(adapter, __IAVF_RESETTING);
 		adapter->flags |= IAVF_FLAG_RESET_PENDING;
 		adapter->aq_required = 0;
 		adapter->current_op = VIRTCHNL_OP_UNKNOWN;
@@ -2081,7 +2081,7 @@ static void iavf_disable_vf(struct iavf_adapter *adapter)
 	adapter->netdev->flags &= ~IFF_UP;
 	mutex_unlock(&adapter->crit_lock);
 	adapter->flags &= ~IAVF_FLAG_RESET_PENDING;
-	adapter->state = __IAVF_DOWN;
+	iavf_change_state(adapter, __IAVF_DOWN);
 	wake_up(&adapter->down_waitqueue);
 	dev_info(&adapter->pdev->dev, "Reset task did not complete, VF disabled\n");
 }
@@ -2191,7 +2191,7 @@ static void iavf_reset_task(struct work_struct *work)
 	}
 	iavf_irq_disable(adapter);
 
-	adapter->state = __IAVF_RESETTING;
+	iavf_change_state(adapter, __IAVF_RESETTING);
 	adapter->flags &= ~IAVF_FLAG_RESET_PENDING;
 
 	/* free the Tx/Rx rings and descriptors, might be better to just
@@ -2291,11 +2291,14 @@ static void iavf_reset_task(struct work_struct *work)
 
 		iavf_configure(adapter);
 
+		/* iavf_up_complete() will switch device back
+		 * to __IAVF_RUNNING
+		 */
 		iavf_up_complete(adapter);
 
 		iavf_irq_enable(adapter, true);
 	} else {
-		adapter->state = __IAVF_DOWN;
+		iavf_change_state(adapter, __IAVF_DOWN);
 		wake_up(&adapter->down_waitqueue);
 	}
 	mutex_unlock(&adapter->client_lock);
@@ -3297,7 +3300,7 @@ static int iavf_close(struct net_device *netdev)
 		adapter->flags |= IAVF_FLAG_CLIENT_NEEDS_CLOSE;
 
 	iavf_down(adapter);
-	adapter->state = __IAVF_DOWN_PENDING;
+	iavf_change_state(adapter, __IAVF_DOWN_PENDING);
 	iavf_free_traffic_irqs(adapter);
 
 	mutex_unlock(&adapter->crit_lock);
@@ -3679,7 +3682,7 @@ static void iavf_init_task(struct work_struct *work)
 			"Failed to communicate with PF; waiting before retry\n");
 		adapter->flags |= IAVF_FLAG_PF_COMMS_FAILED;
 		iavf_shutdown_adminq(hw);
-		adapter->state = __IAVF_STARTUP;
+		iavf_change_state(adapter, __IAVF_STARTUP);
 		queue_delayed_work(iavf_wq, &adapter->init_task, HZ * 5);
 		goto out;
 	}
@@ -3705,7 +3708,7 @@ static void iavf_shutdown(struct pci_dev *pdev)
 	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. */
-	adapter->state = __IAVF_REMOVE;
+	iavf_change_state(adapter, __IAVF_REMOVE);
 	adapter->aq_required = 0;
 	mutex_unlock(&adapter->crit_lock);
 
@@ -3778,7 +3781,7 @@ static int iavf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	hw->back = adapter;
 
 	adapter->msg_enable = BIT(DEFAULT_DEBUG_LEVEL_SHIFT) - 1;
-	adapter->state = __IAVF_STARTUP;
+	iavf_change_state(adapter, __IAVF_STARTUP);
 
 	/* Call save state here because it relies on the adapter struct. */
 	pci_save_state(pdev);
@@ -3954,7 +3957,7 @@ static void iavf_remove(struct pci_dev *pdev)
 		dev_warn(&adapter->pdev->dev, "failed to acquire crit_lock in %s\n", __FUNCTION__);
 
 	/* Shut down all the garbage mashers on the detention level */
-	adapter->state = __IAVF_REMOVE;
+	iavf_change_state(adapter, __IAVF_REMOVE);
 	adapter->aq_required = 0;
 	adapter->flags &= ~IAVF_FLAG_REINIT_ITR_NEEDED;
 	iavf_free_all_tx_resources(adapter);
diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 8eb8d4663a81..8c3f0f77cb57 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -1735,7 +1735,7 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 		iavf_free_all_tx_resources(adapter);
 		iavf_free_all_rx_resources(adapter);
 		if (adapter->state == __IAVF_DOWN_PENDING) {
-			adapter->state = __IAVF_DOWN;
+			iavf_change_state(adapter, __IAVF_DOWN);
 			wake_up(&adapter->down_waitqueue);
 		}
 		break;
-- 
2.31.1

[PATCH net-next 2/3] iavf: Add __IAVF_INIT_FAILED state

[Tony Nguyen]

From: Mateusz Palczewski <mateusz.palczewski@intel.com>

This commit adds a new state, __IAVF_INIT_FAILED to the state machine.
From now on initialization functions report errors not by returning an
error value, but by changing the state to indicate that something went
wrong.

Signed-off-by: Jakub Pawlak <jakub.pawlak@intel.com>
Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/iavf/iavf.h      |  1 +
 drivers/net/ethernet/intel/iavf/iavf_main.c | 35 ++++++++++++---------
 2 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index cd359cfe5cce..d27821d5b4ad 100644
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -177,6 +177,7 @@ enum iavf_state_t {
 	__IAVF_INIT_VERSION_CHECK,	/* aq msg sent, awaiting reply */
 	__IAVF_INIT_GET_RESOURCES,	/* aq msg sent, awaiting reply */
 	__IAVF_INIT_SW,		/* got resources, setting up structs */
+	__IAVF_INIT_FAILED,	/* init failed, restarting procedure */
 	__IAVF_RESETTING,		/* in reset */
 	__IAVF_COMM_FAILED,		/* communication with PF failed */
 	/* Below here, watchdog is running */
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 3df018c879e1..291473ba70af 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -14,7 +14,7 @@
 static int iavf_setup_all_tx_resources(struct iavf_adapter *adapter);
 static int iavf_setup_all_rx_resources(struct iavf_adapter *adapter);
 static int iavf_close(struct net_device *netdev);
-static int iavf_init_get_resources(struct iavf_adapter *adapter);
+static void iavf_init_get_resources(struct iavf_adapter *adapter);
 static int iavf_check_reset_complete(struct iavf_hw *hw);
 
 char iavf_driver_name[] = "iavf";
@@ -1688,9 +1688,9 @@ static int iavf_process_aq_command(struct iavf_adapter *adapter)
  *
  * Function process __IAVF_STARTUP driver state.
  * When success the state is changed to __IAVF_INIT_VERSION_CHECK
- * when fails it returns -EAGAIN
+ * when fails the state is changed to __IAVF_INIT_FAILED
  **/
-static int iavf_startup(struct iavf_adapter *adapter)
+static void iavf_startup(struct iavf_adapter *adapter)
 {
 	struct pci_dev *pdev = adapter->pdev;
 	struct iavf_hw *hw = &adapter->hw;
@@ -1730,8 +1730,9 @@ static int iavf_startup(struct iavf_adapter *adapter)
 		goto err;
 	}
 	iavf_change_state(adapter, __IAVF_INIT_VERSION_CHECK);
+	return;
 err:
-	return err;
+	iavf_change_state(adapter, __IAVF_INIT_FAILED);
 }
 
 /**
@@ -1740,9 +1741,9 @@ static int iavf_startup(struct iavf_adapter *adapter)
  *
  * Function process __IAVF_INIT_VERSION_CHECK driver state.
  * When success the state is changed to __IAVF_INIT_GET_RESOURCES
- * when fails it returns -EAGAIN
+ * when fails the state is changed to __IAVF_INIT_FAILED
  **/
-static int iavf_init_version_check(struct iavf_adapter *adapter)
+static void iavf_init_version_check(struct iavf_adapter *adapter)
 {
 	struct pci_dev *pdev = adapter->pdev;
 	struct iavf_hw *hw = &adapter->hw;
@@ -1777,8 +1778,9 @@ static int iavf_init_version_check(struct iavf_adapter *adapter)
 		goto err;
 	}
 	iavf_change_state(adapter, __IAVF_INIT_GET_RESOURCES);
+	return;
 err:
-	return err;
+	iavf_change_state(adapter, __IAVF_INIT_FAILED);
 }
 
 /**
@@ -1788,9 +1790,9 @@ static int iavf_init_version_check(struct iavf_adapter *adapter)
  * Function process __IAVF_INIT_GET_RESOURCES driver state and
  * finishes driver initialization procedure.
  * When success the state is changed to __IAVF_DOWN
- * when fails it returns -EAGAIN
+ * when fails the state is changed to __IAVF_INIT_FAILED
  **/
-static int iavf_init_get_resources(struct iavf_adapter *adapter)
+static void iavf_init_get_resources(struct iavf_adapter *adapter)
 {
 	struct net_device *netdev = adapter->netdev;
 	struct pci_dev *pdev = adapter->pdev;
@@ -1818,7 +1820,7 @@ static int iavf_init_get_resources(struct iavf_adapter *adapter)
 		 */
 		iavf_shutdown_adminq(hw);
 		dev_err(&pdev->dev, "Unable to get VF config due to PF error condition, not retrying\n");
-		return 0;
+		return;
 	}
 	if (err) {
 		dev_err(&pdev->dev, "Unable to get VF config (%d)\n", err);
@@ -1910,7 +1912,7 @@ static int iavf_init_get_resources(struct iavf_adapter *adapter)
 	else
 		iavf_init_rss(adapter);
 
-	return err;
+	return;
 err_mem:
 	iavf_free_rss(adapter);
 err_register:
@@ -1921,7 +1923,7 @@ static int iavf_init_get_resources(struct iavf_adapter *adapter)
 	kfree(adapter->vf_res);
 	adapter->vf_res = NULL;
 err:
-	return err;
+	iavf_change_state(adapter, __IAVF_INIT_FAILED);
 }
 
 /**
@@ -3658,15 +3660,18 @@ static void iavf_init_task(struct work_struct *work)
 	}
 	switch (adapter->state) {
 	case __IAVF_STARTUP:
-		if (iavf_startup(adapter) < 0)
+		iavf_startup(adapter);
+		if (adapter->state == __IAVF_INIT_FAILED)
 			goto init_failed;
 		break;
 	case __IAVF_INIT_VERSION_CHECK:
-		if (iavf_init_version_check(adapter) < 0)
+		iavf_init_version_check(adapter);
+		if (adapter->state == __IAVF_INIT_FAILED)
 			goto init_failed;
 		break;
 	case __IAVF_INIT_GET_RESOURCES:
-		if (iavf_init_get_resources(adapter) < 0)
+		iavf_init_get_resources(adapter);
+		if (adapter->state == __IAVF_INIT_FAILED)
 			goto init_failed;
 		goto out;
 	default:
-- 
2.31.1

[PATCH net-next 3/3] iavf: Combine init and watchdog state machines

[Tony Nguyen]

From: Mateusz Palczewski <mateusz.palczewski@intel.com>

Use single state machine for driver initialization and for service
initialized driver. The init state machine implemented in init_task()
is merged into the watchdog_task(). The init_task() function is
removed.

Signed-off-by: Jakub Pawlak <jakub.pawlak@intel.com>
Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/iavf/iavf.h      |   1 -
 drivers/net/ethernet/intel/iavf/iavf_main.c | 136 ++++++++------------
 2 files changed, 57 insertions(+), 80 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index d27821d5b4ad..e0b88ff76466 100644
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -226,7 +226,6 @@ struct iavf_adapter {
 	struct work_struct reset_task;
 	struct work_struct adminq_task;
 	struct delayed_work client_task;
-	struct delayed_work init_task;
 	wait_queue_head_t down_waitqueue;
 	struct iavf_q_vector *q_vectors;
 	struct list_head vlan_filter_list;
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 291473ba70af..56956e449c97 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -1944,7 +1944,48 @@ static void iavf_watchdog_task(struct work_struct *work)
 	if (adapter->flags & IAVF_FLAG_PF_COMMS_FAILED)
 		iavf_change_state(adapter, __IAVF_COMM_FAILED);
 
+	if (adapter->flags & IAVF_FLAG_RESET_NEEDED &&
+	    adapter->state != __IAVF_RESETTING) {
+		iavf_change_state(adapter, __IAVF_RESETTING);
+		adapter->aq_required = 0;
+		adapter->current_op = VIRTCHNL_OP_UNKNOWN;
+	}
+
 	switch (adapter->state) {
+	case __IAVF_STARTUP:
+		iavf_startup(adapter);
+		mutex_unlock(&adapter->crit_lock);
+		queue_delayed_work(iavf_wq, &adapter->watchdog_task,
+				   msecs_to_jiffies(30));
+		return;
+	case __IAVF_INIT_VERSION_CHECK:
+		iavf_init_version_check(adapter);
+		mutex_unlock(&adapter->crit_lock);
+		queue_delayed_work(iavf_wq, &adapter->watchdog_task,
+				   msecs_to_jiffies(30));
+		return;
+	case __IAVF_INIT_GET_RESOURCES:
+		iavf_init_get_resources(adapter);
+		mutex_unlock(&adapter->crit_lock);
+		queue_delayed_work(iavf_wq, &adapter->watchdog_task,
+				   msecs_to_jiffies(1));
+		return;
+	case __IAVF_INIT_FAILED:
+		if (++adapter->aq_wait_count > IAVF_AQ_MAX_ERR) {
+			dev_err(&adapter->pdev->dev,
+				"Failed to communicate with PF; waiting before retry\n");
+			adapter->flags |= IAVF_FLAG_PF_COMMS_FAILED;
+			iavf_shutdown_adminq(hw);
+			mutex_unlock(&adapter->crit_lock);
+			queue_delayed_work(iavf_wq,
+					   &adapter->watchdog_task, (5 * HZ));
+			return;
+		}
+		/* Try again from failed step*/
+		iavf_change_state(adapter, adapter->last_state);
+		mutex_unlock(&adapter->crit_lock);
+		queue_delayed_work(iavf_wq, &adapter->watchdog_task, HZ);
+		return;
 	case __IAVF_COMM_FAILED:
 		reg_val = rd32(hw, IAVF_VFGEN_RSTAT) &
 			  IAVF_VFGEN_RSTAT_VFR_STATE_MASK;
@@ -1953,23 +1994,19 @@ static void iavf_watchdog_task(struct work_struct *work)
 			/* A chance for redemption! */
 			dev_err(&adapter->pdev->dev,
 				"Hardware came out of reset. Attempting reinit.\n");
-			iavf_change_state(adapter, __IAVF_STARTUP);
-			adapter->flags &= ~IAVF_FLAG_PF_COMMS_FAILED;
-			queue_delayed_work(iavf_wq, &adapter->init_task, 10);
-			mutex_unlock(&adapter->crit_lock);
-			/* Don't reschedule the watchdog, since we've restarted
-			 * the init task. When init_task contacts the PF and
+			/* When init task contacts the PF and
 			 * gets everything set up again, it'll restart the
 			 * watchdog for us. Down, boy. Sit. Stay. Woof.
 			 */
-			return;
+			iavf_change_state(adapter, __IAVF_STARTUP);
+			adapter->flags &= ~IAVF_FLAG_PF_COMMS_FAILED;
 		}
 		adapter->aq_required = 0;
 		adapter->current_op = VIRTCHNL_OP_UNKNOWN;
 		queue_delayed_work(iavf_wq,
 				   &adapter->watchdog_task,
 				   msecs_to_jiffies(10));
-		goto watchdog_done;
+		return;
 	case __IAVF_RESETTING:
 		mutex_unlock(&adapter->crit_lock);
 		queue_delayed_work(iavf_wq, &adapter->watchdog_task, HZ * 2);
@@ -1992,12 +2029,14 @@ static void iavf_watchdog_task(struct work_struct *work)
 			    adapter->state == __IAVF_RUNNING)
 				iavf_request_stats(adapter);
 		}
+		if (adapter->state == __IAVF_RUNNING)
+			iavf_detect_recover_hung(&adapter->vsi);
 		break;
 	case __IAVF_REMOVE:
 		mutex_unlock(&adapter->crit_lock);
 		return;
 	default:
-		goto restart_watchdog;
+		return;
 	}
 
 	/* check for hw reset */
@@ -2009,22 +2048,21 @@ static void iavf_watchdog_task(struct work_struct *work)
 		adapter->current_op = VIRTCHNL_OP_UNKNOWN;
 		dev_err(&adapter->pdev->dev, "Hardware reset detected\n");
 		queue_work(iavf_wq, &adapter->reset_task);
-		goto watchdog_done;
+		mutex_unlock(&adapter->crit_lock);
+		queue_delayed_work(iavf_wq,
+				   &adapter->watchdog_task, HZ * 2);
+		return;
 	}
 
 	schedule_delayed_work(&adapter->client_task, msecs_to_jiffies(5));
-watchdog_done:
-	if (adapter->state == __IAVF_RUNNING ||
-	    adapter->state == __IAVF_COMM_FAILED)
-		iavf_detect_recover_hung(&adapter->vsi);
 	mutex_unlock(&adapter->crit_lock);
 restart_watchdog:
+	queue_work(iavf_wq, &adapter->adminq_task);
 	if (adapter->aq_required)
 		queue_delayed_work(iavf_wq, &adapter->watchdog_task,
 				   msecs_to_jiffies(20));
 	else
 		queue_delayed_work(iavf_wq, &adapter->watchdog_task, HZ * 2);
-	queue_work(iavf_wq, &adapter->adminq_task);
 }
 
 static void iavf_disable_vf(struct iavf_adapter *adapter)
@@ -2310,6 +2348,8 @@ static void iavf_reset_task(struct work_struct *work)
 reset_err:
 	mutex_unlock(&adapter->client_lock);
 	mutex_unlock(&adapter->crit_lock);
+	if (running)
+		iavf_change_state(adapter, __IAVF_RUNNING);
 	dev_err(&adapter->pdev->dev, "failed to allocate resources during reinit\n");
 	iavf_close(netdev);
 }
@@ -3635,67 +3675,6 @@ int iavf_process_config(struct iavf_adapter *adapter)
 	return 0;
 }
 
-/**
- * iavf_init_task - worker thread to perform delayed initialization
- * @work: pointer to work_struct containing our data
- *
- * This task completes the work that was begun in probe. Due to the nature
- * of VF-PF communications, we may need to wait tens of milliseconds to get
- * responses back from the PF. Rather than busy-wait in probe and bog down the
- * whole system, we'll do it in a task so we can sleep.
- * This task only runs during driver init. Once we've established
- * communications with the PF driver and set up our netdev, the watchdog
- * takes over.
- **/
-static void iavf_init_task(struct work_struct *work)
-{
-	struct iavf_adapter *adapter = container_of(work,
-						    struct iavf_adapter,
-						    init_task.work);
-	struct iavf_hw *hw = &adapter->hw;
-
-	if (iavf_lock_timeout(&adapter->crit_lock, 5000)) {
-		dev_warn(&adapter->pdev->dev, "failed to acquire crit_lock in %s\n", __FUNCTION__);
-		return;
-	}
-	switch (adapter->state) {
-	case __IAVF_STARTUP:
-		iavf_startup(adapter);
-		if (adapter->state == __IAVF_INIT_FAILED)
-			goto init_failed;
-		break;
-	case __IAVF_INIT_VERSION_CHECK:
-		iavf_init_version_check(adapter);
-		if (adapter->state == __IAVF_INIT_FAILED)
-			goto init_failed;
-		break;
-	case __IAVF_INIT_GET_RESOURCES:
-		iavf_init_get_resources(adapter);
-		if (adapter->state == __IAVF_INIT_FAILED)
-			goto init_failed;
-		goto out;
-	default:
-		goto init_failed;
-	}
-
-	queue_delayed_work(iavf_wq, &adapter->init_task,
-			   msecs_to_jiffies(30));
-	goto out;
-init_failed:
-	if (++adapter->aq_wait_count > IAVF_AQ_MAX_ERR) {
-		dev_err(&adapter->pdev->dev,
-			"Failed to communicate with PF; waiting before retry\n");
-		adapter->flags |= IAVF_FLAG_PF_COMMS_FAILED;
-		iavf_shutdown_adminq(hw);
-		iavf_change_state(adapter, __IAVF_STARTUP);
-		queue_delayed_work(iavf_wq, &adapter->init_task, HZ * 5);
-		goto out;
-	}
-	queue_delayed_work(iavf_wq, &adapter->init_task, HZ);
-out:
-	mutex_unlock(&adapter->crit_lock);
-}
-
 /**
  * iavf_shutdown - Shutdown the device in preparation for a reboot
  * @pdev: pci device structure
@@ -3830,8 +3809,7 @@ static int iavf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	INIT_WORK(&adapter->adminq_task, iavf_adminq_task);
 	INIT_DELAYED_WORK(&adapter->watchdog_task, iavf_watchdog_task);
 	INIT_DELAYED_WORK(&adapter->client_task, iavf_client_task);
-	INIT_DELAYED_WORK(&adapter->init_task, iavf_init_task);
-	queue_delayed_work(iavf_wq, &adapter->init_task,
+	queue_delayed_work(iavf_wq, &adapter->watchdog_task,
 			   msecs_to_jiffies(5 * (pdev->devfn & 0x07)));
 
 	/* Setup the wait queue for indicating transition to down status */
@@ -3937,8 +3915,8 @@ static void iavf_remove(struct pci_dev *pdev)
 	int err;
 	/* Indicate we are in remove and not to run reset_task */
 	mutex_lock(&adapter->remove_lock);
-	cancel_delayed_work_sync(&adapter->init_task);
 	cancel_work_sync(&adapter->reset_task);
+	cancel_delayed_work_sync(&adapter->watchdog_task);
 	cancel_delayed_work_sync(&adapter->client_task);
 	if (adapter->netdev_registered) {
 		unregister_netdev(netdev);
-- 
2.31.1

Re: [PATCH net-next 0/3][pull request] 40GbE Intel Wired LAN Driver Updates 2021-10-18

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by Tony Nguyen <anthony.l.nguyen@intel.com>:

On Mon, 18 Oct 2021 14:26:22 -0700 you wrote:
> Mateusz Palczewski says:
> 
> Use single state machine for driver initialization
> and for service initialized driver. The init state
> machine implemented in init_task() is merged
> into the watchdog_task(). The init_task() function
> is removed.
> 
> [...]

Here is the summary with links:
  - [net-next,1/3] iavf: Refactor iavf state machine tracking
    https://git.kernel.org/netdev/net-next/c/45eebd62999d
  - [net-next,2/3] iavf: Add __IAVF_INIT_FAILED state
    https://git.kernel.org/netdev/net-next/c/59756ad6948b
  - [net-next,3/3] iavf: Combine init and watchdog state machines
    https://git.kernel.org/netdev/net-next/c/898ef1cb1cb2

You are awesome, thank you!
--
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