iavf: fix reset task race with iavf_remove()

The reset task is currently scheduled from the watchdog or adminq tasks.
First, all direct calls to schedule the reset task are replaced with the
iavf_schedule_reset(), which is modified to accept the flag showing the
type of reset.

To prevent the reset task from starting once iavf_remove() starts, we need
to check the __IAVF_IN_REMOVE_TASK bit before we schedule it. This is now
easily added to iavf_schedule_reset().

Finally, remove the check for IAVF_FLAG_RESET_NEEDED in the watchdog task.
It is redundant since all callers who set the flag immediately schedules
the reset task.

Fixes: 3ccd54ef44eb ("iavf: Fix init state closure on remove")
Fixes: 14756b2ae265 ("iavf: Fix __IAVF_RESETTING state usage")
Signed-off-by: Ahmed Zaki <ahmed.zaki@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index bf5e3c8..8cbdebc 100644 (file)
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -520,7 +520,7 @@ int iavf_up(struct iavf_adapter *adapter);
 void iavf_down(struct iavf_adapter *adapter);
 int iavf_process_config(struct iavf_adapter *adapter);
 int iavf_parse_vf_resource_msg(struct iavf_adapter *adapter);
-void iavf_schedule_reset(struct iavf_adapter *adapter);
+void iavf_schedule_reset(struct iavf_adapter *adapter, u64 flags);
 void iavf_schedule_request_stats(struct iavf_adapter *adapter);
 void iavf_schedule_finish_config(struct iavf_adapter *adapter);
 void iavf_reset(struct iavf_adapter *adapter);

diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index b7141c2..2f47cfa 100644 (file)
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -532,8 +532,7 @@ static int iavf_set_priv_flags(struct net_device *netdev, u32 flags)
        /* issue a reset to force legacy-rx change to take effect */
        if (changed_flags & IAVF_FLAG_LEGACY_RX) {
                if (netif_running(netdev)) {
-                       adapter->flags |= IAVF_FLAG_RESET_NEEDED;
-                       queue_work(adapter->wq, &adapter->reset_task);
+                       iavf_schedule_reset(adapter, IAVF_FLAG_RESET_NEEDED);
                        ret = iavf_wait_for_reset(adapter);
                        if (ret)
                                netdev_warn(netdev, "Changing private flags timeout or interrupted waiting for reset");
@@ -676,8 +675,7 @@ 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);
+               iavf_schedule_reset(adapter, IAVF_FLAG_RESET_NEEDED);
                ret = iavf_wait_for_reset(adapter);
                if (ret)
                        netdev_warn(netdev, "Changing ring parameters timeout or interrupted waiting for reset");
@@ -1860,7 +1858,7 @@ static int iavf_set_channels(struct net_device *netdev,
 
        adapter->num_req_queues = num_req;
        adapter->flags |= IAVF_FLAG_REINIT_ITR_NEEDED;
-       iavf_schedule_reset(adapter);
+       iavf_schedule_reset(adapter, IAVF_FLAG_RESET_NEEDED);
 
        ret = iavf_wait_for_reset(adapter);
        if (ret)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 2a2ae3c..3a88d41 100644 (file)
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -301,12 +301,14 @@ static int iavf_lock_timeout(struct mutex *lock, unsigned int msecs)
 /**
  * iavf_schedule_reset - Set the flags and schedule a reset event
  * @adapter: board private structure
+ * @flags: IAVF_FLAG_RESET_PENDING or IAVF_FLAG_RESET_NEEDED
  **/
-void iavf_schedule_reset(struct iavf_adapter *adapter)
+void iavf_schedule_reset(struct iavf_adapter *adapter, u64 flags)
 {
-       if (!(adapter->flags &
-             (IAVF_FLAG_RESET_PENDING | IAVF_FLAG_RESET_NEEDED))) {
-               adapter->flags |= IAVF_FLAG_RESET_NEEDED;
+       if (!test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section) &&
+           !(adapter->flags &
+           (IAVF_FLAG_RESET_PENDING | IAVF_FLAG_RESET_NEEDED))) {
+               adapter->flags |= flags;
                queue_work(adapter->wq, &adapter->reset_task);
        }
 }
@@ -334,7 +336,7 @@ static void iavf_tx_timeout(struct net_device *netdev, unsigned int txqueue)
        struct iavf_adapter *adapter = netdev_priv(netdev);
 
        adapter->tx_timeout_count++;
-       iavf_schedule_reset(adapter);
+       iavf_schedule_reset(adapter, IAVF_FLAG_RESET_NEEDED);
 }
 
 /**
@@ -2478,7 +2480,7 @@ int iavf_parse_vf_resource_msg(struct iavf_adapter *adapter)
                        adapter->vsi_res->num_queue_pairs);
                adapter->flags |= IAVF_FLAG_REINIT_MSIX_NEEDED;
                adapter->num_req_queues = adapter->vsi_res->num_queue_pairs;
-               iavf_schedule_reset(adapter);
+               iavf_schedule_reset(adapter, IAVF_FLAG_RESET_NEEDED);
 
                return -EAGAIN;
        }
@@ -2775,14 +2777,6 @@ 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->aq_required = 0;
-               adapter->current_op = VIRTCHNL_OP_UNKNOWN;
-               mutex_unlock(&adapter->crit_lock);
-               queue_work(adapter->wq, &adapter->reset_task);
-               return;
-       }
-
        switch (adapter->state) {
        case __IAVF_STARTUP:
                iavf_startup(adapter);
@@ -2910,11 +2904,10 @@ static void iavf_watchdog_task(struct work_struct *work)
        /* check for hw reset */
        reg_val = rd32(hw, IAVF_VF_ARQLEN1) & IAVF_VF_ARQLEN1_ARQENABLE_MASK;
        if (!reg_val) {
-               adapter->flags |= IAVF_FLAG_RESET_PENDING;
                adapter->aq_required = 0;
                adapter->current_op = VIRTCHNL_OP_UNKNOWN;
                dev_err(&adapter->pdev->dev, "Hardware reset detected\n");
-               queue_work(adapter->wq, &adapter->reset_task);
+               iavf_schedule_reset(adapter, IAVF_FLAG_RESET_PENDING);
                mutex_unlock(&adapter->crit_lock);
                queue_delayed_work(adapter->wq,
                                   &adapter->watchdog_task, HZ * 2);
@@ -3288,9 +3281,7 @@ static void iavf_adminq_task(struct work_struct *work)
        } while (pending);
        mutex_unlock(&adapter->crit_lock);
 
-       if ((adapter->flags &
-            (IAVF_FLAG_RESET_PENDING | IAVF_FLAG_RESET_NEEDED)) ||
-           adapter->state == __IAVF_RESETTING)
+       if (iavf_is_reset_in_progress(adapter))
                goto freedom;
 
        /* check for error indications */
@@ -4387,8 +4378,7 @@ 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);
+               iavf_schedule_reset(adapter, IAVF_FLAG_RESET_NEEDED);
                ret = iavf_wait_for_reset(adapter);
                if (ret < 0)
                        netdev_warn(netdev, "MTU change interrupted waiting for reset");

diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 073ac29..be3c007 100644 (file)
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -1961,9 +1961,8 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
                case VIRTCHNL_EVENT_RESET_IMPENDING:
                        dev_info(&adapter->pdev->dev, "Reset indication received from the PF\n");
                        if (!(adapter->flags & IAVF_FLAG_RESET_PENDING)) {
-                               adapter->flags |= IAVF_FLAG_RESET_PENDING;
                                dev_info(&adapter->pdev->dev, "Scheduling reset task\n");
-                               queue_work(adapter->wq, &adapter->reset_task);
+                               iavf_schedule_reset(adapter, IAVF_FLAG_RESET_PENDING);
                        }
                        break;
                default: