| Message ID | 20210324095639.1354700-1-olteanv@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v3,net] net: dsa: only unset VLAN filtering when last port leaves last VLAN-aware bridge | expand |
On Wed Mar 24 2021, Vladimir Oltean wrote: > From: Vladimir Oltean <vladimir.oltean@nxp.com> > > DSA is aware of switches with global VLAN filtering since the blamed > commit, but it makes a bad decision when multiple bridges are spanning > the same switch: > > ip link add br0 type bridge vlan_filtering 1 > ip link add br1 type bridge vlan_filtering 1 > ip link set swp2 master br0 > ip link set swp3 master br0 > ip link set swp4 master br1 > ip link set swp5 master br1 > ip link set swp5 nomaster > ip link set swp4 nomaster > [138665.939930] sja1105 spi0.1: port 3: dsa_core: VLAN filtering is a global setting > [138665.947514] DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE > > When all ports leave br1, DSA blindly attempts to disable VLAN filtering > on the switch, ignoring the fact that br0 still exists and is VLAN-aware > too. It fails while doing that. > > This patch checks whether any port exists at all and is under a > VLAN-aware bridge. > > Fixes: d371b7c92d19 ("net: dsa: Unset vlan_filtering when ports leave the bridge") > Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> > Tested-by: Florian Fainelli <f.fainelli@gmail.com> > Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Hello: This patch was applied to netdev/net.git (refs/heads/master): On Wed, 24 Mar 2021 11:56:39 +0200 you wrote: > From: Vladimir Oltean <vladimir.oltean@nxp.com> > > DSA is aware of switches with global VLAN filtering since the blamed > commit, but it makes a bad decision when multiple bridges are spanning > the same switch: > > ip link add br0 type bridge vlan_filtering 1 > ip link add br1 type bridge vlan_filtering 1 > ip link set swp2 master br0 > ip link set swp3 master br0 > ip link set swp4 master br1 > ip link set swp5 master br1 > ip link set swp5 nomaster > ip link set swp4 nomaster > [138665.939930] sja1105 spi0.1: port 3: dsa_core: VLAN filtering is a global setting > [138665.947514] DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE > > [...] Here is the summary with links: - [v3,net] net: dsa: only unset VLAN filtering when last port leaves last VLAN-aware bridge https://git.kernel.org/netdev/net/c/479dc497db83 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
diff --git a/net/dsa/switch.c b/net/dsa/switch.c index 4b5da89dc27a..32963276452f 100644 --- a/net/dsa/switch.c +++ b/net/dsa/switch.c @@ -107,7 +107,7 @@ static int dsa_switch_bridge_leave(struct dsa_switch *ds, bool unset_vlan_filtering = br_vlan_enabled(info->br); struct dsa_switch_tree *dst = ds->dst; struct netlink_ext_ack extack = {0}; - int err, i; + int err, port; if (dst->index == info->tree_index && ds->index == info->sw_index && ds->ops->port_bridge_join) @@ -124,13 +124,16 @@ static int dsa_switch_bridge_leave(struct dsa_switch *ds, * it. That is a good thing, because that lets us handle it and also * handle the case where the switch's vlan_filtering setting is global * (not per port). When that happens, the correct moment to trigger the - * vlan_filtering callback is only when the last port left this bridge. + * vlan_filtering callback is only when the last port leaves the last + * VLAN-aware bridge. */ if (unset_vlan_filtering && ds->vlan_filtering_is_global) { - for (i = 0; i < ds->num_ports; i++) { - if (i == info->port) - continue; - if (dsa_to_port(ds, i)->bridge_dev == info->br) { + for (port = 0; port < ds->num_ports; port++) { + struct net_device *bridge_dev; + + bridge_dev = dsa_to_port(ds, port)->bridge_dev; + + if (bridge_dev && br_vlan_enabled(bridge_dev)) { unset_vlan_filtering = false; break; }