netdev - [PATCH net 2/3] iavf: Move netdev_update

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Message-Id: <20230120211036.430946-3-anthony.l.nguyen@intel.com>
Date:   Fri, 20 Jan 2023 13:10:35 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com
Cc:     Marcin Szycik <marcin.szycik@...ux.intel.com>,
        netdev@...r.kernel.org, anthony.l.nguyen@...el.com,
        Phani Burra <phani.r.burra@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Marek Szlosek <marek.szlosek@...el.com>
Subject: [PATCH net 2/3] iavf: Move netdev_update_features() into watchdog task

From: Marcin Szycik <marcin.szycik@...ux.intel.com>

Remove netdev_update_features() from iavf_adminq_task(), as it can cause
deadlocks due to needing rtnl_lock. Instead use the
IAVF_FLAG_SETUP_NETDEV_FEATURES flag to indicate that netdev features need
to be updated in the watchdog task. iavf_set_vlan_offload_features()
and iavf_set_queue_vlan_tag_loc() can be called directly from
iavf_virtchnl_completion().

Suggested-by: Phani Burra <phani.r.burra@...el.com>
Signed-off-by: Marcin Szycik <marcin.szycik@...ux.intel.com>
Reviewed-by: Alexander Lobakin <alexandr.lobakin@...el.com>
Tested-by: Marek Szlosek <marek.szlosek@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c   | 27 +++++++------------
 .../net/ethernet/intel/iavf/iavf_virtchnl.c   |  8 ++++++
 2 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 0aa32c164ecf..de7112ae8416 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -2692,6 +2692,15 @@ static void iavf_watchdog_task(struct work_struct *work)
 		goto restart_watchdog;
 	}
 
+	if ((adapter->flags & IAVF_FLAG_SETUP_NETDEV_FEATURES) &&
+	    adapter->netdev_registered &&
+	    !test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section) &&
+	    rtnl_trylock()) {
+		netdev_update_features(adapter->netdev);
+		rtnl_unlock();
+		adapter->flags &= ~IAVF_FLAG_SETUP_NETDEV_FEATURES;
+	}
+
 	if (adapter->flags & IAVF_FLAG_PF_COMMS_FAILED)
 		iavf_change_state(adapter, __IAVF_COMM_FAILED);
 
@@ -3233,24 +3242,6 @@ static void iavf_adminq_task(struct work_struct *work)
 	} while (pending);
 	mutex_unlock(&adapter->crit_lock);
 
-	if ((adapter->flags & IAVF_FLAG_SETUP_NETDEV_FEATURES)) {
-		if (adapter->netdev_registered ||
-		    !test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section)) {
-			struct net_device *netdev = adapter->netdev;
-
-			rtnl_lock();
-			netdev_update_features(netdev);
-			rtnl_unlock();
-			/* Request VLAN offload settings */
-			if (VLAN_V2_ALLOWED(adapter))
-				iavf_set_vlan_offload_features
-					(adapter, 0, netdev->features);
-
-			iavf_set_queue_vlan_tag_loc(adapter);
-		}
-
-		adapter->flags &= ~IAVF_FLAG_SETUP_NETDEV_FEATURES;
-	}
 	if ((adapter->flags &
 	     (IAVF_FLAG_RESET_PENDING | IAVF_FLAG_RESET_NEEDED)) ||
 	    adapter->state == __IAVF_RESETTING)
diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 0752fd67c96e..365ca0c710c4 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -2226,6 +2226,14 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 
 		iavf_process_config(adapter);
 		adapter->flags |= IAVF_FLAG_SETUP_NETDEV_FEATURES;
+
+		/* Request VLAN offload settings */
+		if (VLAN_V2_ALLOWED(adapter))
+			iavf_set_vlan_offload_features(adapter, 0,
+						       netdev->features);
+
+		iavf_set_queue_vlan_tag_loc(adapter);
+
 		was_mac_changed = !ether_addr_equal(netdev->dev_addr,
 						    adapter->hw.mac.addr);
 
-- 
2.38.1