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net: ethernet: mtk_eth_soc: avoid creating duplicate offload entries

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Sometimes multiple CLS_REPLACE calls are issued for the same connection.
rhashtable_insert_fast does not check for these duplicates, so multiple
hardware flow entries can be created.
Fix this by checking for an existing entry early

Fixes: 502e84e238 ("net: ethernet: mtk_eth_soc: add flow offloading support")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Felix Fietkau 2021-09-22 16:55:48 -07:00 committed by David S. Miller
parent 31339440b2
commit e68daf61ed
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/mediatek/mtk_ppe_offload.c
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@ -186,6 +186,9 @@ mtk_flow_offload_replace(struct mtk_eth *eth, struct flow_cls_offload *f)
int hash;
int i;
if (rhashtable_lookup(&eth->flow_table, &f->cookie, mtk_flow_ht_params))
return -EEXIST;
if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_META)) {
struct flow_match_meta match;