ice: convert ice_mbx_clear_malvf to void and use WARN

The ice_mbx_clear_malvf function checks for a few error conditions before
clearing the appropriate data. These error conditions are really warnings
that should never occur in a properly initialized driver. Every caller of
ice_mbx_clear_malvf just prints a dev_dbg message on failure which will
generally be ignored.

Convert this function to void and switch the error return values to
WARN_ON. This will make any potentially misconfiguration more visible and
makes future refactors that involve changing how we store the malicious VF
data easier.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Tested-by: Marek Szlosek <marek.szlosek@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_sriov.c

@@ -204,10 +204,8 @@ void ice_free_vfs(struct ice_pf *pf)
 		}
 
 		/* clear malicious info since the VF is getting released */
-		if (ice_mbx_clear_malvf(&hw->mbx_snapshot, pf->vfs.malvfs,
-					ICE_MAX_SRIOV_VFS, vf->vf_id))
-			dev_dbg(dev, "failed to clear malicious VF state for VF %u\n",
-				vf->vf_id);
+		ice_mbx_clear_malvf(&hw->mbx_snapshot, pf->vfs.malvfs,
+				    ICE_MAX_SRIOV_VFS, vf->vf_id);
 
 		mutex_unlock(&vf->cfg_lock);
 	}

drivers/net/ethernet/intel/ice/ice_vf_lib.c

@@ -496,10 +496,8 @@ void ice_reset_all_vfs(struct ice_pf *pf)
 
 	/* clear all malicious info if the VFs are getting reset */
 	ice_for_each_vf(pf, bkt, vf)
-		if (ice_mbx_clear_malvf(&hw->mbx_snapshot, pf->vfs.malvfs,
-					ICE_MAX_SRIOV_VFS, vf->vf_id))
-			dev_dbg(dev, "failed to clear malicious VF state for VF %u\n",
-				vf->vf_id);
+		ice_mbx_clear_malvf(&hw->mbx_snapshot, pf->vfs.malvfs,
+				    ICE_MAX_SRIOV_VFS, vf->vf_id);
 
 	/* If VFs have been disabled, there is no need to reset */
 	if (test_and_set_bit(ICE_VF_DIS, pf->state)) {
@@ -705,10 +703,8 @@ int ice_reset_vf(struct ice_vf *vf, u32 flags)
 	ice_eswitch_replay_vf_mac_rule(vf);
 
 	/* if the VF has been reset allow it to come up again */
-	if (ice_mbx_clear_malvf(&hw->mbx_snapshot, pf->vfs.malvfs,
-				ICE_MAX_SRIOV_VFS, vf->vf_id))
-		dev_dbg(dev, "failed to clear malicious VF state for VF %u\n",
-			vf->vf_id);
+	ice_mbx_clear_malvf(&hw->mbx_snapshot, pf->vfs.malvfs,
+			    ICE_MAX_SRIOV_VFS, vf->vf_id);
 
 out_unlock:
 	if (flags & ICE_VF_RESET_LOCK)

drivers/net/ethernet/intel/ice/ice_vf_mbx.c

@@ -392,19 +392,19 @@ ice_mbx_report_malvf(struct ice_hw *hw, unsigned long *all_malvfs,
  * that the new VF loaded is not considered malicious before going
  * through the overflow detection algorithm.
  */
-int
+void
 ice_mbx_clear_malvf(struct ice_mbx_snapshot *snap, unsigned long *all_malvfs,
 		    u16 bitmap_len, u16 vf_id)
 {
-	if (!snap || !all_malvfs)
-		return -EINVAL;
+	if (WARN_ON(!snap || !all_malvfs))
+		return;
 
-	if (bitmap_len < snap->mbx_vf.vfcntr_len)
-		return -EINVAL;
+	if (WARN_ON(bitmap_len < snap->mbx_vf.vfcntr_len))
+		return;
 
 	/* Ensure VF ID value is not larger than bitmap or VF counter length */
-	if (vf_id >= bitmap_len || vf_id >= snap->mbx_vf.vfcntr_len)
-		return -EIO;
+	if (WARN_ON(vf_id >= bitmap_len || vf_id >= snap->mbx_vf.vfcntr_len))
+		return;
 
 	/* Clear VF ID bit in the bitmap tracking malicious VFs attached to PF */
 	clear_bit(vf_id, all_malvfs);
@@ -416,8 +416,6 @@ ice_mbx_clear_malvf(struct ice_mbx_snapshot *snap, unsigned long *all_malvfs,
 	 * values in the mailbox overflow detection algorithm.
 	 */
 	snap->mbx_vf.vf_cntr[vf_id] = 0;
-
-	return 0;
 }
 
 /**

drivers/net/ethernet/intel/ice/ice_vf_mbx.h

@@ -22,7 +22,7 @@ u32 ice_conv_link_speed_to_virtchnl(bool adv_link_support, u16 link_speed);
 int
 ice_mbx_vf_state_handler(struct ice_hw *hw, struct ice_mbx_data *mbx_data,
 			 u16 vf_id, bool *is_mal_vf);
-int
+void
 ice_mbx_clear_malvf(struct ice_mbx_snapshot *snap, unsigned long *all_malvfs,
 		    u16 bitmap_len, u16 vf_id);
 int ice_mbx_init_snapshot(struct ice_hw *hw, u16 vf_count);