From: Ioana Ciornei <[email protected]>
The 802.1Q tagging performs an unbalanced setup in terms of RX VIDs on
the CPU port. For the ingress path of a 802.1Q switch to work, the RX
VID of a port needs to be seen as tagged egress on the CPU port.
While configuring the other front-panel ports to be part of this VID,
for bridge scenarios, the untagged flag is applied even on the CPU port
in dsa_switch_vlan_add. This happens because DSA applies the same flags
on the CPU port as on the (bridge-controlled) slave ports, and the
effect in this case is that the CPU port tagged settings get deleted.
Instead of fixing DSA by introducing a way to control VLAN flags on the
CPU port (and hence stop inheriting from the slave ports) - a hard,
perhaps intractable problem - avoid this situation by moving the setup
part of the RX VID on the CPU port after all the other front-panel ports
have been added to the VID.
Fixes: f9bbe4477c30 ("net: dsa: Optional VLAN-based port separation for
switches without tagging")
Signed-off-by: Ioana Ciornei <[email protected]>
Signed-off-by: Vladimir Oltean <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
---
Changes in v2:
None.
net/dsa/tag_8021q.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/net/dsa/tag_8021q.c b/net/dsa/tag_8021q.c
index 8ae48c7e1e76..4adec6bbfe59 100644
--- a/net/dsa/tag_8021q.c
+++ b/net/dsa/tag_8021q.c
@@ -128,10 +128,7 @@ int dsa_port_setup_8021q_tagging(struct dsa_switch *ds,
int port, bool enabled)
u16 flags;
if (i == upstream)
- /* CPU port needs to see this port's RX VID
- * as tagged egress.
- */
- flags = 0;
+ continue;
else if (i == port)
/* The RX VID is pvid on this port */
flags = BRIDGE_VLAN_INFO_UNTAGGED |
@@ -150,6 +147,20 @@ int dsa_port_setup_8021q_tagging(struct dsa_switch *ds,
int port, bool enabled)
return err;
}
}
+
+ /* CPU port needs to see this port's RX VID
+ * as tagged egress.
+ */
+ if (enabled)
+ err = dsa_port_vid_add(upstream_dp, rx_vid, 0);
+ else
+ err = dsa_port_vid_del(upstream_dp, rx_vid);
+ if (err) {
+ dev_err(ds->dev, "Failed to apply RX VID %d to port %d: %d\n",
+ rx_vid, port, err);
+ return err;
+ }
+
/* Finally apply the TX VID on this port and on the CPU port */
if (enabled)
err = dsa_port_vid_add(dp, tx_vid, BRIDGE_VLAN_INFO_UNTAGGED);
--
2.17.1
