Do not automatically bail out on sending notifications about activity on
non-user-added FDB entries. Instead, notify about this activity except
for cases where the activity itself originates in a notification, to
avoid sending duplicate notifications.

Signed-off-by: Petr Machata <pe...@mellanox.com>
---
 net/bridge/br.c           |  4 ++--
 net/bridge/br_fdb.c       | 40 +++++++++++++++++++++++++++-------------
 net/bridge/br_private.h   |  4 ++--
 net/bridge/br_switchdev.c |  2 +-
 4 files changed, 32 insertions(+), 18 deletions(-)

diff --git a/net/bridge/br.c b/net/bridge/br.c
index 671d13c..c6b033e 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -141,7 +141,7 @@ static int br_switchdev_event(struct notifier_block *unused,
        case SWITCHDEV_FDB_ADD_TO_BRIDGE:
                fdb_info = ptr;
                err = br_fdb_external_learn_add(br, p, fdb_info->addr,
-                                               fdb_info->vid);
+                                               fdb_info->vid, false);
                if (err) {
                        err = notifier_from_errno(err);
                        break;
@@ -152,7 +152,7 @@ static int br_switchdev_event(struct notifier_block *unused,
        case SWITCHDEV_FDB_DEL_TO_BRIDGE:
                fdb_info = ptr;
                err = br_fdb_external_learn_del(br, p, fdb_info->addr,
-                                               fdb_info->vid);
+                                               fdb_info->vid, false);
                if (err)
                        err = notifier_from_errno(err);
                break;
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index a1c409c..272d1a2 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -39,8 +39,8 @@ static const struct rhashtable_params br_fdb_rht_params = {
 static struct kmem_cache *br_fdb_cache __read_mostly;
 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
                      const unsigned char *addr, u16 vid);
-static void fdb_notify(struct net_bridge *br,
-                      const struct net_bridge_fdb_entry *, int);
+static void __fdb_notify(struct net_bridge *br,
+                        const struct net_bridge_fdb_entry *, int, bool);
 
 int __init br_fdb_init(void)
 {
@@ -195,7 +195,8 @@ static void fdb_del_hw_addr(struct net_bridge *br, const 
unsigned char *addr)
        }
 }
 
-static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
+static void __fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
+                        bool notify)
 {
        trace_fdb_delete(br, f);
 
@@ -205,10 +206,15 @@ static void fdb_delete(struct net_bridge *br, struct 
net_bridge_fdb_entry *f)
        hlist_del_init_rcu(&f->fdb_node);
        rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
                               br_fdb_rht_params);
-       fdb_notify(br, f, RTM_DELNEIGH);
+       __fdb_notify(br, f, RTM_DELNEIGH, notify);
        call_rcu(&f->rcu, fdb_rcu_free);
 }
 
+static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
+{
+       __fdb_delete(br, f, true);
+}
+
 /* Delete a local entry if no other port had the same address. */
 static void fdb_delete_local(struct net_bridge *br,
                             const struct net_bridge_port *p,
@@ -514,6 +520,12 @@ static struct net_bridge_fdb_entry *fdb_create(struct 
net_bridge *br,
        return fdb;
 }
 
+static void fdb_notify(struct net_bridge *br,
+                      const struct net_bridge_fdb_entry *fdb, int type)
+{
+       __fdb_notify(br, fdb, type, true);
+}
+
 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
                  const unsigned char *addr, u16 vid)
 {
@@ -686,14 +698,16 @@ static inline size_t fdb_nlmsg_size(void)
                + nla_total_size(sizeof(struct nda_cacheinfo));
 }
 
-static void fdb_notify(struct net_bridge *br,
-                      const struct net_bridge_fdb_entry *fdb, int type)
+static void __fdb_notify(struct net_bridge *br,
+                        const struct net_bridge_fdb_entry *fdb, int type,
+                        bool notify)
 {
        struct net *net = dev_net(br->dev);
        struct sk_buff *skb;
        int err = -ENOBUFS;
 
-       br_switchdev_fdb_notify(fdb, type);
+       if (notify)
+               br_switchdev_fdb_notify(fdb, type);
 
        skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
        if (skb == NULL)
@@ -856,7 +870,7 @@ static int __br_fdb_add(struct ndmsg *ndm, struct 
net_bridge *br,
                rcu_read_unlock();
                local_bh_enable();
        } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
-               err = br_fdb_external_learn_add(br, p, addr, vid);
+               err = br_fdb_external_learn_add(br, p, addr, vid, true);
        } else {
                spin_lock_bh(&br->hash_lock);
                err = fdb_add_entry(br, p, addr, ndm->ndm_state,
@@ -1065,7 +1079,7 @@ void br_fdb_unsync_static(struct net_bridge *br, struct 
net_bridge_port *p)
 }
 
 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
-                             const unsigned char *addr, u16 vid)
+                             const unsigned char *addr, u16 vid, bool notify)
 {
        struct net_bridge_fdb_entry *fdb;
        bool modified = false;
@@ -1083,7 +1097,7 @@ int br_fdb_external_learn_add(struct net_bridge *br, 
struct net_bridge_port *p,
                        goto err_unlock;
                }
                fdb->added_by_external_learn = 1;
-               fdb_notify(br, fdb, RTM_NEWNEIGH);
+               __fdb_notify(br, fdb, RTM_NEWNEIGH, notify);
        } else {
                fdb->updated = jiffies;
 
@@ -1102,7 +1116,7 @@ int br_fdb_external_learn_add(struct net_bridge *br, 
struct net_bridge_port *p,
                }
 
                if (modified)
-                       fdb_notify(br, fdb, RTM_NEWNEIGH);
+                       __fdb_notify(br, fdb, RTM_NEWNEIGH, notify);
        }
 
 err_unlock:
@@ -1112,7 +1126,7 @@ int br_fdb_external_learn_add(struct net_bridge *br, 
struct net_bridge_port *p,
 }
 
 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
-                             const unsigned char *addr, u16 vid)
+                             const unsigned char *addr, u16 vid, bool notify)
 {
        struct net_bridge_fdb_entry *fdb;
        int err = 0;
@@ -1121,7 +1135,7 @@ int br_fdb_external_learn_del(struct net_bridge *br, 
struct net_bridge_port *p,
 
        fdb = br_fdb_find(br, addr, vid);
        if (fdb && fdb->added_by_external_learn)
-               fdb_delete(br, fdb);
+               __fdb_delete(br, fdb, notify);
        else
                err = -ENOENT;
 
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 1a50931..b9ab4e5 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -553,9 +553,9 @@ int br_fdb_dump(struct sk_buff *skb, struct 
netlink_callback *cb,
 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
-                             const unsigned char *addr, u16 vid);
+                             const unsigned char *addr, u16 vid, bool notify);
 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
-                             const unsigned char *addr, u16 vid);
+                             const unsigned char *addr, u16 vid, bool notify);
 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
                          const unsigned char *addr, u16 vid);
 
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index 71a03c4..35474d4 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -118,7 +118,7 @@ br_switchdev_fdb_call_notifiers(bool adding, const unsigned 
char *mac,
 void
 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
 {
-       if (!fdb->added_by_user || !fdb->dst)
+       if (!fdb->dst)
                return;
 
        switch (type) {
-- 
2.4.11

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