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 | 47 ++++++++++++++++++++++++++--------------------- net/bridge/br_private.h | 6 ++++-- net/bridge/br_switchdev.c | 2 +- 4 files changed, 33 insertions(+), 26 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..b19e310 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -40,7 +40,7 @@ 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); + 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 swdev_notify) { trace_fdb_delete(br, f); @@ -205,7 +206,7 @@ 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, swdev_notify); call_rcu(&f->rcu, fdb_rcu_free); } @@ -241,7 +242,7 @@ static void fdb_delete_local(struct net_bridge *br, return; } - fdb_delete(br, f); + fdb_delete(br, f, true); } void br_fdb_find_delete_local(struct net_bridge *br, @@ -356,7 +357,7 @@ void br_fdb_cleanup(struct work_struct *work) } else { spin_lock_bh(&br->hash_lock); if (!hlist_unhashed(&f->fdb_node)) - fdb_delete(br, f); + fdb_delete(br, f, true); spin_unlock_bh(&br->hash_lock); } } @@ -376,7 +377,7 @@ void br_fdb_flush(struct net_bridge *br) spin_lock_bh(&br->hash_lock); hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) { if (!f->is_static) - fdb_delete(br, f); + fdb_delete(br, f, true); } spin_unlock_bh(&br->hash_lock); } @@ -405,7 +406,7 @@ void br_fdb_delete_by_port(struct net_bridge *br, if (f->is_local) fdb_delete_local(br, p, f); else - fdb_delete(br, f); + fdb_delete(br, f, true); } spin_unlock_bh(&br->hash_lock); } @@ -531,7 +532,7 @@ static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, return 0; br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n", source ? source->dev->name : br->dev->name, addr, vid); - fdb_delete(br, fdb); + fdb_delete(br, fdb, true); } fdb = fdb_create(br, source, addr, vid, 1, 1); @@ -539,7 +540,7 @@ static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, return -ENOMEM; fdb_add_hw_addr(br, addr); - fdb_notify(br, fdb, RTM_NEWNEIGH); + fdb_notify(br, fdb, RTM_NEWNEIGH, true); return 0; } @@ -594,7 +595,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, fdb->added_by_user = 1; if (unlikely(fdb_modified)) { trace_br_fdb_update(br, source, addr, vid, added_by_user); - fdb_notify(br, fdb, RTM_NEWNEIGH); + fdb_notify(br, fdb, RTM_NEWNEIGH, true); } } } else { @@ -605,7 +606,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, fdb->added_by_user = 1; trace_br_fdb_update(br, source, addr, vid, added_by_user); - fdb_notify(br, fdb, RTM_NEWNEIGH); + fdb_notify(br, fdb, RTM_NEWNEIGH, true); } /* else we lose race and someone else inserts * it first, don't bother updating @@ -687,13 +688,15 @@ static inline size_t fdb_nlmsg_size(void) } static void fdb_notify(struct net_bridge *br, - const struct net_bridge_fdb_entry *fdb, int type) + const struct net_bridge_fdb_entry *fdb, int type, + bool swdev_notify) { struct net *net = dev_net(br->dev); struct sk_buff *skb; int err = -ENOBUFS; - br_switchdev_fdb_notify(fdb, type); + if (swdev_notify) + br_switchdev_fdb_notify(fdb, type); skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC); if (skb == NULL) @@ -832,7 +835,7 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source, fdb->used = jiffies; if (modified) { fdb->updated = jiffies; - fdb_notify(br, fdb, RTM_NEWNEIGH); + fdb_notify(br, fdb, RTM_NEWNEIGH, true); } return 0; @@ -856,7 +859,7 @@ 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, @@ -945,7 +948,7 @@ static int fdb_delete_by_addr_and_port(struct net_bridge *br, if (!fdb || fdb->dst != p) return -ENOENT; - fdb_delete(br, fdb); + fdb_delete(br, fdb, true); return 0; } @@ -1065,7 +1068,8 @@ 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 swdev_notify) { struct net_bridge_fdb_entry *fdb; bool modified = false; @@ -1083,7 +1087,7 @@ 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, swdev_notify); } else { fdb->updated = jiffies; @@ -1102,7 +1106,7 @@ 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, swdev_notify); } err_unlock: @@ -1112,7 +1116,8 @@ 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 swdev_notify) { struct net_bridge_fdb_entry *fdb; int err = 0; @@ -1121,7 +1126,7 @@ 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, swdev_notify); else err = -ENOENT; diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 1a50931..80a69b8 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -553,9 +553,11 @@ 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 swdev_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 swdev_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