From: Felix Fietkau Date: Mon, 20 Mar 2023 15:37:55 +0100 Subject: [PATCH] net: ethernet: mediatek: mtk_ppe: prefer newly added l2 flows over existing ones When a device is roaming between interfaces and a new flow entry is created, we should assume that its output device is more up to date than whatever entry existed already. Signed-off-by: Felix Fietkau --- --- a/drivers/net/ethernet/mediatek/mtk_ppe.c +++ b/drivers/net/ethernet/mediatek/mtk_ppe.c @@ -662,10 +662,20 @@ void mtk_foe_entry_clear(struct mtk_ppe static int mtk_foe_entry_commit_l2(struct mtk_ppe *ppe, struct mtk_flow_entry *entry) { + struct mtk_flow_entry *prev; + entry->type = MTK_FLOW_TYPE_L2; - return rhashtable_insert_fast(&ppe->l2_flows, &entry->l2_node, - mtk_flow_l2_ht_params); + prev = rhashtable_lookup_get_insert_fast(&ppe->l2_flows, &entry->l2_node, + mtk_flow_l2_ht_params); + if (likely(!prev)) + return 0; + + if (IS_ERR(prev)) + return PTR_ERR(prev); + + return rhashtable_replace_fast(&ppe->l2_flows, &prev->l2_node, + &entry->l2_node, mtk_flow_l2_ht_params); } int mtk_foe_entry_commit(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)