i40e: Fix race condition while adding/deleting MAC/VLAN filters

There was a race condition in access to hw->aq.asq_last_status
while adding and deleting  MAC/VLAN filters causing
incorrect error status to be printed as ERROR OK instead of
the correct error.

Change calls to i40e_aq_add_macvlan in i40e_aqc_add_filters
and i40e_aq_remove_macvlan in i40e_aqc_del_filters
to  _v2 versions that return Admin Queue status on the stack
to avoid race conditions in access to hw->aq.asq_last_status.

Signed-off-by: Sylwester Dziedziuch <sylwesterx.dziedziuch@intel.com>
Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 748806c..b2c1861 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -2143,19 +2143,19 @@ void i40e_aqc_del_filters(struct i40e_vsi *vsi, const char *vsi_name,
                          int num_del, int *retval)
 {
        struct i40e_hw *hw = &vsi->back->hw;
+       enum i40e_admin_queue_err aq_status;
        i40e_status aq_ret;
-       int aq_err;
 
-       aq_ret = i40e_aq_remove_macvlan(hw, vsi->seid, list, num_del, NULL);
-       aq_err = hw->aq.asq_last_status;
+       aq_ret = i40e_aq_remove_macvlan_v2(hw, vsi->seid, list, num_del, NULL,
+                                          &aq_status);
 
        /* Explicitly ignore and do not report when firmware returns ENOENT */
-       if (aq_ret && !(aq_err == I40E_AQ_RC_ENOENT)) {
+       if (aq_ret && !(aq_status == I40E_AQ_RC_ENOENT)) {
                *retval = -EIO;
                dev_info(&vsi->back->pdev->dev,
                         "ignoring delete macvlan error on %s, err %s, aq_err %s\n",
                         vsi_name, i40e_stat_str(hw, aq_ret),
-                        i40e_aq_str(hw, aq_err));
+                        i40e_aq_str(hw, aq_status));
        }
 }
 
@@ -2178,10 +2178,10 @@ void i40e_aqc_add_filters(struct i40e_vsi *vsi, const char *vsi_name,
                          int num_add)
 {
        struct i40e_hw *hw = &vsi->back->hw;
-       int aq_err, fcnt;
+       enum i40e_admin_queue_err aq_status;
+       int fcnt;
 
-       i40e_aq_add_macvlan(hw, vsi->seid, list, num_add, NULL);
-       aq_err = hw->aq.asq_last_status;
+       i40e_aq_add_macvlan_v2(hw, vsi->seid, list, num_add, NULL, &aq_status);
        fcnt = i40e_update_filter_state(num_add, list, add_head);
 
        if (fcnt != num_add) {
@@ -2189,17 +2189,19 @@ void i40e_aqc_add_filters(struct i40e_vsi *vsi, const char *vsi_name,
                        set_bit(__I40E_VSI_OVERFLOW_PROMISC, vsi->state);
                        dev_warn(&vsi->back->pdev->dev,
                                 "Error %s adding RX filters on %s, promiscuous mode forced on\n",
-                                i40e_aq_str(hw, aq_err), vsi_name);
+                                i40e_aq_str(hw, aq_status), vsi_name);
                } else if (vsi->type == I40E_VSI_SRIOV ||
                           vsi->type == I40E_VSI_VMDQ1 ||
                           vsi->type == I40E_VSI_VMDQ2) {
                        dev_warn(&vsi->back->pdev->dev,
                                 "Error %s adding RX filters on %s, please set promiscuous on manually for %s\n",
-                                i40e_aq_str(hw, aq_err), vsi_name, vsi_name);
+                                i40e_aq_str(hw, aq_status), vsi_name,
+                                            vsi_name);
                } else {
                        dev_warn(&vsi->back->pdev->dev,
                                 "Error %s adding RX filters on %s, incorrect VSI type: %i.\n",
-                                i40e_aq_str(hw, aq_err), vsi_name, vsi->type);
+                                i40e_aq_str(hw, aq_status), vsi_name,
+                                            vsi->type);
                }
        }
 }