netdev - [PATCH v3 net-next 2/2] net: ethernet: mtk_eth_soc: mtk

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230331124707.40296-2-nbd@nbd.name>
Date:   Fri, 31 Mar 2023 14:47:07 +0200
From:   Felix Fietkau <nbd@....name>
To:     netdev@...r.kernel.org
Subject: [PATCH v3 net-next 2/2] net: ethernet: mtk_eth_soc: mtk_ppe: prefer newly added l2 flows

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 <nbd@....name>
---
v2: fix patch description
 drivers/net/ethernet/mediatek/mtk_ppe.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c
index f9c9f2ea4206..dd9581334b05 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
@@ -635,10 +635,20 @@ void mtk_foe_entry_clear(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
 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)
-- 
2.39.0