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Date: Tue, 15 Feb 2022 19:02:12 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Florian Fainelli <f.fainelli@...il.com>,
Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
Roopa Prabhu <roopa@...dia.com>,
Nikolay Aleksandrov <nikolay@...dia.com>,
Jiri Pirko <jiri@...dia.com>, Ido Schimmel <idosch@...dia.com>,
Rafael Richter <rafael.richter@....de>,
Daniel Klauer <daniel.klauer@....de>,
Tobias Waldekranz <tobias@...dekranz.com>
Subject: [PATCH v3 net-next 05/11] net: bridge: switchdev: differentiate new VLANs from changed ones
br_switchdev_port_vlan_add() currently emits a SWITCHDEV_PORT_OBJ_ADD
event with a SWITCHDEV_OBJ_ID_PORT_VLAN for 2 distinct cases:
- a struct net_bridge_vlan got created
- an existing struct net_bridge_vlan was modified
This makes it impossible for switchdev drivers to properly balance
PORT_OBJ_ADD with PORT_OBJ_DEL events, so if we want to allow that to
happen, we must provide a way for drivers to distinguish between a
VLAN with changed flags and a new one.
Annotate struct switchdev_obj_port_vlan with a "bool changed" that
distinguishes the 2 cases above.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
v2->v3:
- drop "old_flags" from struct switchdev_obj_port_vlan, nobody needs it
now, in v2 only DSA needed it to filter out BRENTRY transitions, that
is now solved cleaner.
v1->v2:
- patch is new, logically replaces the need for "net: bridge: vlan:
notify a switchdev deletion when modifying flags of existing VLAN"
include/net/switchdev.h | 7 +++++++
net/bridge/br_private.h | 6 +++---
net/bridge/br_switchdev.c | 3 ++-
net/bridge/br_vlan.c | 10 +++++-----
4 files changed, 17 insertions(+), 9 deletions(-)
diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index d353793dfeb5..92cc763991e9 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -81,6 +81,13 @@ struct switchdev_obj_port_vlan {
struct switchdev_obj obj;
u16 flags;
u16 vid;
+ /* If set, the notifier signifies a change of one of the following
+ * flags for a VLAN that already exists:
+ * - BRIDGE_VLAN_INFO_PVID
+ * - BRIDGE_VLAN_INFO_UNTAGGED
+ * Entries with BRIDGE_VLAN_INFO_BRENTRY unset are not notified at all.
+ */
+ bool changed;
};
#define SWITCHDEV_OBJ_PORT_VLAN(OBJ) \
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 2661dda1a92b..48bc61ebc211 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1985,7 +1985,7 @@ void br_switchdev_mdb_notify(struct net_device *dev,
struct net_bridge_port_group *pg,
int type);
int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
- struct netlink_ext_ack *extack);
+ bool changed, struct netlink_ext_ack *extack);
int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
void br_switchdev_init(struct net_bridge *br);
@@ -2052,8 +2052,8 @@ static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
return 0;
}
-static inline int br_switchdev_port_vlan_add(struct net_device *dev,
- u16 vid, u16 flags,
+static inline int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid,
+ u16 flags, bool changed,
struct netlink_ext_ack *extack)
{
return -EOPNOTSUPP;
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index f8fbaaa7c501..fb5115387d82 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -160,13 +160,14 @@ br_switchdev_fdb_notify(struct net_bridge *br,
}
int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
- struct netlink_ext_ack *extack)
+ bool changed, struct netlink_ext_ack *extack)
{
struct switchdev_obj_port_vlan v = {
.obj.orig_dev = dev,
.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
.flags = flags,
.vid = vid,
+ .changed = changed,
};
return switchdev_port_obj_add(dev, &v.obj, extack);
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 990fe0db476d..30486f20e29f 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -109,7 +109,7 @@ static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
/* Try switchdev op first. In case it is not supported, fallback to
* 8021q add.
*/
- err = br_switchdev_port_vlan_add(dev, v->vid, flags, extack);
+ err = br_switchdev_port_vlan_add(dev, v->vid, flags, false, extack);
if (err == -EOPNOTSUPP)
return vlan_vid_add(dev, br->vlan_proto, v->vid);
v->priv_flags |= BR_VLFLAG_ADDED_BY_SWITCHDEV;
@@ -303,7 +303,7 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags,
} else {
if (br_vlan_should_use(v)) {
err = br_switchdev_port_vlan_add(dev, v->vid, flags,
- extack);
+ false, extack);
if (err && err != -EOPNOTSUPP)
goto out;
}
@@ -707,7 +707,7 @@ static int br_vlan_add_existing(struct net_bridge *br,
*/
if (becomes_brentry || would_change) {
err = br_switchdev_port_vlan_add(br->dev, vlan->vid, flags,
- extack);
+ would_change, extack);
if (err && err != -EOPNOTSUPP)
return err;
}
@@ -1282,8 +1282,8 @@ int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
if (would_change) {
/* Pass the flags to the hardware bridge */
- ret = br_switchdev_port_vlan_add(port->dev, vid,
- flags, extack);
+ ret = br_switchdev_port_vlan_add(port->dev, vid, flags,
+ true, extack);
if (ret && ret != -EOPNOTSUPP)
return ret;
}
--
2.25.1
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