The following commit has been merged in the batadv/net-next branch: commit 84a8b5b2be497afdc91c85b916a0c3d753b838ca Author: Remi Pommarel repk@triplefau.lt Date: Fri Nov 22 16:52:52 2024 +0100

batman-adv: Don't keep redundant TT change events

When adding a local TT twice within the same OGM interval (e.g. happens when flag get updated), the flags of the first TT change entry is updated with the second one and both change events is added to the change list. This leads to having the same ADD change entry twice. Similarly, a DEL+DEL scenario is also creating twice the same event.

Deduplicate ADD+ADD or DEL+DEL scenarios to reduce the TT change events that need to be sent in both OGM and TT response.

Signed-off-by: Remi Pommarel repk@triplefau.lt Co-Developed-by: Sven Eckelmann sven@narfation.org Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Simon Wunderlich sw@simonwunderlich.de

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 6e0345b91ece2..41e5de514694a 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -438,7 +438,7 @@ static void batadv_tt_local_event(struct batadv_priv *bat_priv,

del_op_requested = flags & BATADV_TT_CLIENT_DEL;

- /* check for ADD+DEL or DEL+ADD events */ + /* check for ADD+DEL, DEL+ADD, ADD+ADD or DEL+DEL events */ spin_lock_bh(&bat_priv->tt.changes_list_lock); changes = READ_ONCE(bat_priv->tt.local_changes); list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, @@ -446,30 +446,26 @@ static void batadv_tt_local_event(struct batadv_priv *bat_priv, if (!batadv_compare_eth(entry->change.addr, common->addr)) continue;

- /* DEL+ADD in the same orig interval have no effect and can be - * removed to avoid silly behaviour on the receiver side. The - * other way around (ADD+DEL) can happen in case of roaming of - * a client still in the NEW state. Roaming of NEW clients is - * now possible due to automatically recognition of "temporary" - * clients - */ del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL; - if (!del_op_requested && del_op_entry) - goto del; - if (del_op_requested && !del_op_entry) - goto del; - - /* this is a second add in the same originator interval. It - * means that flags have been changed: update them! - */ - if (!del_op_requested && !del_op_entry) - entry->change.flags = flags; + if (del_op_requested != del_op_entry) { + /* DEL+ADD in the same orig interval have no effect and + * can be removed to avoid silly behaviour on the + * receiver side. The other way around (ADD+DEL) can + * happen in case of roaming of a client still in the + * NEW state. Roaming of NEW clients is now possible due + * to automatically recognition of "temporary" clients + */ + list_del(&entry->list); + kmem_cache_free(batadv_tt_change_cache, entry); + changes--; + } else { + /* this is a second add or del in the same originator + * interval. It could mean that flags have been changed + * (e.g. double add): update them + */ + entry->change.flags = flags; + }

- continue; -del: - list_del(&entry->list); - kmem_cache_free(batadv_tt_change_cache, entry); - changes--; kmem_cache_free(batadv_tt_change_cache, tt_change_node); goto update_changes; }