i40e: don't hold spinlock while resetting VF

When we refactored handling of the PVID in commit 9af52f60b2d9
("i40e: use (add|rm)_vlan_all_mac helper functions when changing PVID")
we introduced a scheduling while atomic regression.

This occurred because we now held the spinlock across a call to
i40e_reset_vf(), which results in a usleep_range() call that triggers
a scheduling while atomic bug. This was rare as it only occurred if the
user configured a VLAN on a VF and also attempted to reconfigure the VF
from the host system with a port VLAN.

We do need to hold the lock while calling i40e_is_vsi_in_vlan(), but we
should not be holding it while we reset the VF.

We'll fix this by introducing a separate helper function
i40e_vsi_has_vlans which checks whether we have a PVID and whether the
VSI has configured VLANs. This helper function will manage its own need
for the mac_filter_hash_lock.

Then, we can move the acquiring of the spinlock until after we reset the
VF, which ensures that we do not sleep while holding the lock.

Using a separate function like this makes the code more clear and is
easier to read than attempting to release and re-acquire the spinlock
when we reset the VF.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 9e3667f..53ead12 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -2926,6 +2926,34 @@ error_param:
 }
 
 /**
+ * i40e_vsi_has_vlans - True if VSI has configured VLANs
+ * @vsi: pointer to the vsi
+ *
+ * Check if a VSI has configured any VLANs. False if we have a port VLAN or if
+ * we have no configured VLANs. Do not call while holding the
+ * mac_filter_hash_lock.
+ */
+static bool i40e_vsi_has_vlans(struct i40e_vsi *vsi)
+{
+       bool have_vlans;
+
+       /* If we have a port VLAN, then the VSI cannot have any VLANs
+        * configured, as all MAC/VLAN filters will be assigned to the PVID.
+        */
+       if (vsi->info.pvid)
+               return false;
+
+       /* Since we don't have a PVID, we know that if the device is in VLAN
+        * mode it must be because of a VLAN filter configured on this VSI.
+        */
+       spin_lock_bh(&vsi->mac_filter_hash_lock);
+       have_vlans = i40e_is_vsi_in_vlan(vsi);
+       spin_unlock_bh(&vsi->mac_filter_hash_lock);
+
+       return have_vlans;
+}
+
+/**
  * i40e_ndo_set_vf_port_vlan
  * @netdev: network interface device structure
  * @vf_id: VF identifier
@@ -2977,10 +3005,7 @@ int i40e_ndo_set_vf_port_vlan(struct net_device *netdev, int vf_id,
                /* duplicate request, so just return success */
                goto error_pvid;
 
-       /* Locked once because multiple functions below iterate list */
-       spin_lock_bh(&vsi->mac_filter_hash_lock);
-
-       if (le16_to_cpu(vsi->info.pvid) == 0 && i40e_is_vsi_in_vlan(vsi)) {
+       if (i40e_vsi_has_vlans(vsi)) {
                dev_err(&pf->pdev->dev,
                        "VF %d has already configured VLAN filters and the administrator is requesting a port VLAN override.\nPlease unload and reload the VF driver for this change to take effect.\n",
                        vf_id);
@@ -2993,6 +3018,9 @@ int i40e_ndo_set_vf_port_vlan(struct net_device *netdev, int vf_id,
                vsi = pf->vsi[vf->lan_vsi_idx];
        }
 
+       /* Locked once because multiple functions below iterate list */
+       spin_lock_bh(&vsi->mac_filter_hash_lock);
+
        /* Check for condition where there was already a port VLAN ID
         * filter set and now it is being deleted by setting it to zero.
         * Additionally check for the condition where there was a port