[Intel-wired-lan] [PATCH net] ice: roll back the port VLAN when ice_eswitch_br_set_pvid() fails

[Linkui Xiao <xiaolinkui@126.com>]

From: Linkui Xiao <xiaolinkui@kylinos.cn>

ice_eswitch_br_set_pvid() puts the VF VSI into port VLAN mode with
ice_vf_vsi_enable_port_vlan() before it programs the port VLAN itself.
Both error paths below that point return the error code straight away,
so nothing is undone when set_port_vlan() or add_vlan() fails.

The stale port VLAN is the more visible half of the problem.
set_port_vlan() turns on Rx VLAN pruning in the VSI context and relies
on the add_vlan() call right after it to install the matching prune
filter, so a failing add_vlan() leaves the VF VSI pruning away every
packet it receives, while port->pvid stays 0 and the bridge is told the
VLAN was not offloaded.

The VLAN ops table is never restored either.
ice_vf_vsi_disable_port_vlan() is only ever called from
ice_eswitch_br_clear_pvid(), which is reached from
ice_eswitch_br_vlan_cleanup() only when port->pvid matches the VLAN
being removed. Neither the failed VLAN, which was never inserted into
port->vlans, nor a port->pvid value ever got that far, so the VSI keeps
the port VLAN flavour of its inner and outer vlan_ops until the VF VSI 
is rebuilt:
dis_rx_filtering() turns into a no-op and, in Double VLAN Mode, the
inner add_vlan() and del_vlan() stop doing anything.

Unwind both steps the way ice_eswitch_br_clear_pvid() does: clear the
port VLAN from the VSI context when it was already programmed, then
hand the VLAN ops back to ice_port_vlan_off().

Fixes: 2946204b3fa8 ("ice: implement bridge port vlan")
Cc: stable@vger.kernel.org
Signed-off-by: Linkui Xiao <xiaolinkui@kylinos.cn>
---
 drivers/net/ethernet/intel/ice/ice_eswitch_br.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_eswitch_br.c b/drivers/net/ethernet/intel/ice/ice_eswitch_br.c
index 1d8a6b95ccda..53ce98ba7007 100644
--- a/drivers/net/ethernet/intel/ice/ice_eswitch_br.c
+++ b/drivers/net/ethernet/intel/ice/ice_eswitch_br.c
@@ -679,16 +679,23 @@ ice_eswitch_br_set_pvid(struct ice_esw_br_port *port,
 	vlan_ops = ice_get_compat_vsi_vlan_ops(port->vsi);
 	err = vlan_ops->set_port_vlan(port->vsi, &port_vlan);
 	if (err)
-		return err;
+		goto err_disable_port_vlan;
 
 	err = vlan_ops->add_vlan(port->vsi, &port_vlan);
 	if (err)
-		return err;
+		goto err_clear_port_vlan;
 
 	ice_eswitch_br_port_vlans_flush(port);
 	port->pvid = vlan->vid;
 
 	return 0;
+
+err_clear_port_vlan:
+	vlan_ops->clear_port_vlan(port->vsi);
+err_disable_port_vlan:
+	ice_vf_vsi_disable_port_vlan(port->vsi);
+
+	return err;
 }
 
 static struct ice_esw_br_vlan *
-- 
2.25.1