target/linux/generic/pending-5.10/700-net-ethernet-mtk_eth_soc-avoid-creating-duplicate-of.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Thu, 8 Jul 2021 07:08:29 +0200
   3 Subject: [PATCH] net: ethernet: mtk_eth_soc: avoid creating duplicate offload
   4  entries
   5
   6 Sometimes multiple CLS_REPLACE calls are issued for the same connection.
   7 rhashtable_insert_fast does not check for these duplicates, so multiple
   8 hardware flow entries can be created.
   9 Fix this by checking for an existing entry early
  10
  11 Fixes: 502e84e2382d ("net: ethernet: mtk_eth_soc: add flow offloading support")
  12 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  13 ---
  14
  15 --- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
  16 +++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
  17 @@ -187,6 +187,9 @@ mtk_flow_offload_replace(struct mtk_eth
  18         int hash;
  19         int i;
  20
  21 +       if (rhashtable_lookup(&eth->flow_table, &f->cookie, mtk_flow_ht_params))
  22 +               return -EEXIST;
  23 +
  24         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_META)) {
  25                 struct flow_match_meta match;
  26