[Intel-wired-lan] [PATCH iwl-net v6 1/4] iavf: Wait for reset in callbacks which trigger it

Kamil Maziarz kamil.maziarz at intel.com
Thu May 11 09:56:25 UTC 2023


From: Marcin Szycik <marcin.szycik at linux.intel.com>

There was a fail when trying to add the interface to bonding
right after changing the MTU on the interface. It was caused
by bonding interface unable to open the interface due to
interface being in __RESETTING state because of MTU change.

Add new reset_waitqueue to indicate that reset has finished.
Add waiting for reset to finish in .

Add waiting for reset to finish in callbacks which trigger hw reset:
iavf_set_priv_flags(), iavf_change_mtu() and iavf_set_ringparam().
We choose 5 sec for the timeout waiting time because the same interval
is used in oot where waiting

Add a function iavf_wait_for_reset() to reuse waiting for reset code and
use it also in iavf_set_channels(), which already waits for reset.
We don't use error handling in iavf_set_channels() as this could
cause the device to be in incorrect state if the reset was scheduled
but hit timeout or the waitng function was interrupted by a signal.

We use a 5000ms timeout period because on Hyper-V based systems,
this operation takes around 3000-4000ms. In normal circumstances,
it doesn't take more than 500ms to complete.

Fixes: aa626da947e9 ("iavf: Detach device during reset task")
Signed-off-by: Marcin Szycik <marcin.szycik at linux.intel.com>
Co-developed-by: Dawid Wesierski <dawidx.wesierski at intel.com>
Signed-off-by: Dawid Wesierski <dawidx.wesierski at intel.com>
Signed-off-by: Sylwester Dziedziuch <sylwesterx.dziedziuch at intel.com>
Signed-off-by: Kamil Maziarz <kamil.maziarz at intel.com>
---
v1->v3: changes were done internally
v4: fixed SOB's
v5: changed the way we wake up the reset_waitqueue to make sure that reset is woken up
v6: no changes
---
 drivers/net/ethernet/intel/iavf/iavf.h        |  2 +
 .../net/ethernet/intel/iavf/iavf_ethtool.c    | 31 ++++++-----
 drivers/net/ethernet/intel/iavf/iavf_main.c   | 51 ++++++++++++++++++-
 .../net/ethernet/intel/iavf/iavf_virtchnl.c   |  1 +
 4 files changed, 68 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index 9abaff1f2aff..c51b9ed4dc29 100644
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -257,6 +257,7 @@ struct iavf_adapter {
 	struct work_struct adminq_task;
 	struct delayed_work client_task;
 	wait_queue_head_t down_waitqueue;
+	wait_queue_head_t reset_waitqueue;
 	wait_queue_head_t vc_waitqueue;
 	struct iavf_q_vector *q_vectors;
 	struct list_head vlan_filter_list;
@@ -591,5 +592,6 @@ void iavf_add_adv_rss_cfg(struct iavf_adapter *adapter);
 void iavf_del_adv_rss_cfg(struct iavf_adapter *adapter);
 struct iavf_mac_filter *iavf_add_filter(struct iavf_adapter *adapter,
 					const u8 *macaddr);
+int iavf_wait_for_reset(struct iavf_adapter *adapter);
 int iavf_lock_timeout(struct mutex *lock, unsigned int msecs);
 #endif /* _IAVF_H_ */
diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index 6f171d1d85b7..b7141c2a941d 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -484,6 +484,7 @@ static int iavf_set_priv_flags(struct net_device *netdev, u32 flags)
 {
 	struct iavf_adapter *adapter = netdev_priv(netdev);
 	u32 orig_flags, new_flags, changed_flags;
+	int ret = 0;
 	u32 i;
 
 	orig_flags = READ_ONCE(adapter->flags);
@@ -533,10 +534,13 @@ static int iavf_set_priv_flags(struct net_device *netdev, u32 flags)
 		if (netif_running(netdev)) {
 			adapter->flags |= IAVF_FLAG_RESET_NEEDED;
 			queue_work(adapter->wq, &adapter->reset_task);
+			ret = iavf_wait_for_reset(adapter);
+			if (ret)
+				netdev_warn(netdev, "Changing private flags timeout or interrupted waiting for reset");
 		}
 	}
 
-	return 0;
+	return ret;
 }
 
 /**
@@ -627,6 +631,7 @@ static int iavf_set_ringparam(struct net_device *netdev,
 {
 	struct iavf_adapter *adapter = netdev_priv(netdev);
 	u32 new_rx_count, new_tx_count;
+	int ret = 0;
 
 	if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
 		return -EINVAL;
@@ -673,9 +678,12 @@ static int iavf_set_ringparam(struct net_device *netdev,
 	if (netif_running(netdev)) {
 		adapter->flags |= IAVF_FLAG_RESET_NEEDED;
 		queue_work(adapter->wq, &adapter->reset_task);
+		ret = iavf_wait_for_reset(adapter);
+		if (ret)
+			netdev_warn(netdev, "Changing ring parameters timeout or interrupted waiting for reset");
 	}
 
-	return 0;
+	return ret;
 }
 
 /**
@@ -1830,7 +1838,7 @@ static int iavf_set_channels(struct net_device *netdev,
 {
 	struct iavf_adapter *adapter = netdev_priv(netdev);
 	u32 num_req = ch->combined_count;
-	int i;
+	int ret = 0;
 
 	if ((adapter->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_ADQ) &&
 	    adapter->num_tc) {
@@ -1854,20 +1862,11 @@ static int iavf_set_channels(struct net_device *netdev,
 	adapter->flags |= IAVF_FLAG_REINIT_ITR_NEEDED;
 	iavf_schedule_reset(adapter);
 
-	/* wait for the reset is done */
-	for (i = 0; i < IAVF_RESET_WAIT_COMPLETE_COUNT; i++) {
-		msleep(IAVF_RESET_WAIT_MS);
-		if (adapter->flags & IAVF_FLAG_RESET_PENDING)
-			continue;
-		break;
-	}
-	if (i == IAVF_RESET_WAIT_COMPLETE_COUNT) {
-		adapter->flags &= ~IAVF_FLAG_REINIT_ITR_NEEDED;
-		adapter->num_active_queues = num_req;
-		return -EOPNOTSUPP;
-	}
+	ret = iavf_wait_for_reset(adapter);
+	if (ret)
+		netdev_warn(netdev, "Changing channel count timeout or interrupted waiting for reset");
 
-	return 0;
+	return ret;
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 2de4baff4c20..bc17ea34bb73 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -166,6 +166,45 @@ static struct iavf_adapter *iavf_pdev_to_adapter(struct pci_dev *pdev)
 	return netdev_priv(pci_get_drvdata(pdev));
 }
 
+/**
+ * iavf_is_reset_in_progress - Check if a reset is in progress
+ * @adapter: board private structure
+ */
+static bool iavf_is_reset_in_progress(struct iavf_adapter *adapter)
+{
+	if (adapter->state == __IAVF_RESETTING ||
+	    adapter->flags & (IAVF_FLAG_RESET_PENDING |
+			      IAVF_FLAG_RESET_NEEDED))
+		return true;
+
+	return false;
+}
+
+/**
+ * iavf_wait_for_reset - Wait for reset to finish.
+ * @adapter: board private structure
+ *
+ * Returns 0 if reset finished successfully, negative on timeout or interrupt.
+ */
+int iavf_wait_for_reset(struct iavf_adapter *adapter)
+{
+	int ret = wait_event_interruptible_timeout(adapter->reset_waitqueue,
+					!iavf_is_reset_in_progress(adapter),
+					msecs_to_jiffies(5000));
+
+	/* If ret < 0 then it means wait was interrupted.
+	 * If ret == 0 then it means we got a timeout while waiting
+	 * for reset to finish.
+	 * If ret > 0 it means reset has finished.
+	 */
+	if (ret > 0)
+		return 0;
+	else if (ret < 0)
+		return -EINTR;
+	else
+		return -EBUSY;
+}
+
 /**
  * iavf_allocate_dma_mem_d - OS specific memory alloc for shared code
  * @hw:   pointer to the HW structure
@@ -3166,6 +3205,7 @@ static void iavf_reset_task(struct work_struct *work)
 
 	adapter->flags &= ~IAVF_FLAG_REINIT_ITR_NEEDED;
 
+	wake_up(&adapter->reset_waitqueue);
 	mutex_unlock(&adapter->client_lock);
 	mutex_unlock(&adapter->crit_lock);
 
@@ -4330,6 +4370,7 @@ static int iavf_close(struct net_device *netdev)
 static int iavf_change_mtu(struct net_device *netdev, int new_mtu)
 {
 	struct iavf_adapter *adapter = netdev_priv(netdev);
+	int ret = 0;
 
 	netdev_dbg(netdev, "changing MTU from %d to %d\n",
 		   netdev->mtu, new_mtu);
@@ -4342,9 +4383,14 @@ static int iavf_change_mtu(struct net_device *netdev, int new_mtu)
 	if (netif_running(netdev)) {
 		adapter->flags |= IAVF_FLAG_RESET_NEEDED;
 		queue_work(adapter->wq, &adapter->reset_task);
+		ret = iavf_wait_for_reset(adapter);
+		if (ret < 0)
+			netdev_warn(netdev, "MTU change interrupted waiting for reset");
+		else if (ret)
+			netdev_warn(netdev, "MTU change timed out waiting for reset");
 	}
 
-	return 0;
+	return ret;
 }
 
 #define NETIF_VLAN_OFFLOAD_FEATURES	(NETIF_F_HW_VLAN_CTAG_RX | \
@@ -4945,6 +4991,9 @@ static int iavf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* Setup the wait queue for indicating transition to down status */
 	init_waitqueue_head(&adapter->down_waitqueue);
 
+	/* Setup the wait queue for indicating transition to running state */
+	init_waitqueue_head(&adapter->reset_waitqueue);
+
 	/* Setup the wait queue for indicating virtchannel events */
 	init_waitqueue_head(&adapter->vc_waitqueue);
 
diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 7c0578b5457b..1bab896aaf40 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -2285,6 +2285,7 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 	case VIRTCHNL_OP_ENABLE_QUEUES:
 		/* enable transmits */
 		iavf_irq_enable(adapter, true);
+		wake_up(&adapter->reset_waitqueue);
 		adapter->flags &= ~IAVF_FLAG_QUEUES_DISABLED;
 		break;
 	case VIRTCHNL_OP_DISABLE_QUEUES:
-- 
2.31.1



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