ice: clear port vlan config during reset

Since commit 2a2cb4c6 ("ice: replace ice_vf_recreate_vsi() with
ice_vf_reconfig_vsi()") VF VSI is only reconfigured instead of
recreated. The context configuration from previous setting is still the
same. If any of the config needs to be cleared it needs to be cleared
explicitly.

Previously there was assumption that port vlan will be cleared
automatically. Now, when VSI is only reconfigured we have to do it in the
code.

Not clearing port vlan configuration leads to situation when the driver
VSI config is different than the VSI config in HW. Traffic can't be
passed after setting and clearing port vlan, because of invalid VSI
config in HW.

Example reproduction:
> ip a a dev $(VF) $(VF_IP_ADDRESS)
> ip l s dev $(VF) up
> ping $(VF_IP_ADDRESS)
ping is working fine here
> ip link set eth5 vf 0 vlan 100
> ip link set eth5 vf 0 vlan 0
> ping $(VF_IP_ADDRESS)
ping isn't working

Fixes: 2a2cb4c6 ("ice: replace ice_vf_recreate_vsi() with ice_vf_reconfig_vsi()")
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Tested-by: Piotr Tyda <piotr.tyda@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

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

@@ -335,6 +335,13 @@ static int ice_vf_rebuild_host_vlan_cfg(struct ice_vf *vf, struct ice_vsi *vsi)
 
 		err = vlan_ops->add_vlan(vsi, &vf->port_vlan_info);
 	} else {
+		/* clear possible previous port vlan config */
+		err = ice_vsi_clear_port_vlan(vsi);
+		if (err) {
+			dev_err(dev, "failed to clear port VLAN via VSI parameters for VF %u, error %d\n",
+				vf->vf_id, err);
+			return err;
+		}
 		err = ice_vsi_add_vlan_zero(vsi);
 	}
 

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

@@ -787,3 +787,60 @@ int ice_vsi_clear_outer_port_vlan(struct ice_vsi *vsi)
 	kfree(ctxt);
 	return err;
 }
+
+int ice_vsi_clear_port_vlan(struct ice_vsi *vsi)
+{
+	struct ice_hw *hw = &vsi->back->hw;
+	struct ice_vsi_ctx *ctxt;
+	int err;
+
+	ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
+	if (!ctxt)
+		return -ENOMEM;
+
+	ctxt->info = vsi->info;
+
+	ctxt->info.port_based_outer_vlan = 0;
+	ctxt->info.port_based_inner_vlan = 0;
+
+	ctxt->info.inner_vlan_flags =
+		FIELD_PREP(ICE_AQ_VSI_INNER_VLAN_TX_MODE_M,
+			   ICE_AQ_VSI_INNER_VLAN_TX_MODE_ALL);
+	if (ice_is_dvm_ena(hw)) {
+		ctxt->info.inner_vlan_flags |=
+			FIELD_PREP(ICE_AQ_VSI_INNER_VLAN_EMODE_M,
+				   ICE_AQ_VSI_INNER_VLAN_EMODE_NOTHING);
+		ctxt->info.outer_vlan_flags =
+			FIELD_PREP(ICE_AQ_VSI_OUTER_VLAN_TX_MODE_M,
+				   ICE_AQ_VSI_OUTER_VLAN_TX_MODE_ALL);
+		ctxt->info.outer_vlan_flags |=
+			FIELD_PREP(ICE_AQ_VSI_OUTER_TAG_TYPE_M,
+				   ICE_AQ_VSI_OUTER_TAG_VLAN_8100);
+		ctxt->info.outer_vlan_flags |=
+			ICE_AQ_VSI_OUTER_VLAN_EMODE_NOTHING <<
+			ICE_AQ_VSI_OUTER_VLAN_EMODE_S;
+	}
+
+	ctxt->info.sw_flags2 &= ~ICE_AQ_VSI_SW_FLAG_RX_VLAN_PRUNE_ENA;
+	ctxt->info.valid_sections =
+		cpu_to_le16(ICE_AQ_VSI_PROP_OUTER_TAG_VALID |
+			    ICE_AQ_VSI_PROP_VLAN_VALID |
+			    ICE_AQ_VSI_PROP_SW_VALID);
+
+	err = ice_update_vsi(hw, vsi->idx, ctxt, NULL);
+	if (err) {
+		dev_err(ice_pf_to_dev(vsi->back), "update VSI for clearing port based VLAN failed, err %d aq_err %s\n",
+			err, ice_aq_str(hw->adminq.sq_last_status));
+	} else {
+		vsi->info.port_based_outer_vlan =
+			ctxt->info.port_based_outer_vlan;
+		vsi->info.port_based_inner_vlan =
+			ctxt->info.port_based_inner_vlan;
+		vsi->info.outer_vlan_flags = ctxt->info.outer_vlan_flags;
+		vsi->info.inner_vlan_flags = ctxt->info.inner_vlan_flags;
+		vsi->info.sw_flags2 = ctxt->info.sw_flags2;
+	}
+
+	kfree(ctxt);
+	return err;
+}

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

@@ -36,5 +36,6 @@ int ice_vsi_ena_outer_insertion(struct ice_vsi *vsi, u16 tpid);
 int ice_vsi_dis_outer_insertion(struct ice_vsi *vsi);
 int ice_vsi_set_outer_port_vlan(struct ice_vsi *vsi, struct ice_vlan *vlan);
 int ice_vsi_clear_outer_port_vlan(struct ice_vsi *vsi);
+int ice_vsi_clear_port_vlan(struct ice_vsi *vsi);
 
 #endif /* _ICE_VSI_VLAN_LIB_H_ */