[RFC PATCH v2 net-next 04/16] net: dsa: sync up with bridge port's STP state when joining

Vladimir Oltean
2021-03-18T23:19:28Z

From: Vladimir Oltean <vladimir.oltean@nxp.com>

It may happen that we have the following topology:

ip link add br0 type bridge stp_state 1
ip link add bond0 type bond
ip link set bond0 master br0
ip link set swp0 master bond0
ip link set swp1 master bond0

STP decides that it should put bond0 into the BLOCKING state, and
that's that. The ports that are actively listening for the switchdev
port attributes emitted for the bond0 bridge port (because they are
offloading it) and have the honor of seeing that switchdev port
attribute can react to it, so we can program swp0 and swp1 into the
BLOCKING state.

But if then we do:

ip link set swp2 master bond0

then as far as the bridge is concerned, nothing has changed: it still
has one bridge port. But this new bridge port will not see any STP state
change notification and will remain FORWARDING, which is how the
standalone code leaves it in.

Add a function to the bridge which retrieves the current STP state, such
that drivers can synchronize to it when they may have missed switchdev
events.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
include/linux/if_bridge.h | 6 ++++++
net/bridge/br_stp.c | 14 ++++++++++++++
net/dsa/port.c | 7 +++++++
3 files changed, 27 insertions(+)

diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
index b979005ea39c..920d3a02cc68 100644
--- a/include/linux/if_bridge.h
+++ b/include/linux/if_bridge.h
@@ -136,6 +136,7 @@ struct net_device *br_fdb_find_port(const struct net_device *br_dev,
__u16 vid);
void br_fdb_clear_offload(const struct net_device *dev, u16 vid);
bool br_port_flag_is_set(const struct net_device *dev, unsigned long flag);
+u8 br_port_get_stp_state(const struct net_device *dev);
#else
static inline struct net_device *
br_fdb_find_port(const struct net_device *br_dev,
@@ -154,6 +155,11 @@ br_port_flag_is_set(const struct net_device *dev, unsigned long flag)
{
return false;
}
+
+static inline u8 br_port_get_stp_state(const struct net_device *dev)
+{
+ return BR_STATE_DISABLED;
+}
#endif

#endif
diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index 21c6781906aa..86b5e05d3f21 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -64,6 +64,20 @@ void br_set_state(struct net_bridge_port *p, unsigned int state)
}
}

+u8 br_port_get_stp_state(const struct net_device *dev)
+{
+ struct net_bridge_port *p;
+
+ ASSERT_RTNL();
+
+ p = br_port_get_rtnl(dev);
+ if (!p)
+ return BR_STATE_DISABLED;
+
+ return p->state;
+}
+EXPORT_SYMBOL_GPL(br_port_get_stp_state);
+
/* called under bridge lock */
struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no)
{
diff --git a/net/dsa/port.c b/net/dsa/port.c
index 346c50467810..785374744462 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -171,12 +171,19 @@ static int dsa_port_inherit_brport_flags(struct dsa_port *dp,
static int dsa_port_switchdev_sync(struct dsa_port *dp,
struct netlink_ext_ack *extack)
{
+ struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
+ u8 stp_state;
int err;

err = dsa_port_inherit_brport_flags(dp, extack);
if (err)
return err;

+ stp_state = br_port_get_stp_state(brport_dev);
+ err = dsa_port_set_state(dp, stp_state);
+ if (err && err != -EOPNOTSUPP)
+ return err;
+
return 0;
}

--
2.25.1