target/linux/generic/pending-5.15/736-02-net-ethernet-mediatek-mtk_ppe-prefer-newly-added-l2-.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Mon, 20 Mar 2023 15:37:55 +0100
   3 Subject: [PATCH] net: ethernet: mediatek: mtk_ppe: prefer newly added l2
   4  flows over existing ones
   5
   6 When a device is roaming between interfaces and a new flow entry is created,
   7 we should assume that its output device is more up to date than whatever
   8 entry existed already.
   9
  10 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  11 ---
  12
  13 --- a/drivers/net/ethernet/mediatek/mtk_ppe.c
  14 +++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
  15 @@ -639,10 +639,20 @@ void mtk_foe_entry_clear(struct mtk_ppe
  16  static int
  17  mtk_foe_entry_commit_l2(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
  18  {
  19 +       struct mtk_flow_entry *prev;
  20 +
  21         entry->type = MTK_FLOW_TYPE_L2;
  22
  23 -       return rhashtable_insert_fast(&ppe->l2_flows, &entry->l2_node,
  24 -                                     mtk_flow_l2_ht_params);
  25 +       prev = rhashtable_lookup_get_insert_fast(&ppe->l2_flows, &entry->l2_node,
  26 +                                                mtk_flow_l2_ht_params);
  27 +       if (likely(!prev))
  28 +               return 0;
  29 +
  30 +       if (IS_ERR(prev))
  31 +               return PTR_ERR(prev);
  32 +
  33 +       return rhashtable_replace_fast(&ppe->l2_flows, &prev->l2_node,
  34 +                                      &entry->l2_node, mtk_flow_l2_ht_params);
  35  }
  36
  37  int mtk_foe_entry_commit(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)