netdev - [net PATCH 2/4] net: dsa: qca8k: fix search_and

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Message-Id: <20230724032531.15998-2-ansuelsmth@gmail.com>
Date: Mon, 24 Jul 2023 05:25:29 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Christian Marangi <ansuelsmth@...il.com>,
	Atin Bainada <hi@...nb.me>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: stable@...r.kernel.org
Subject: [net PATCH 2/4] net: dsa: qca8k: fix search_and_insert wrong handling of new rule

On inserting a mdb entry, fdb_search_and_insert is used to add a port to
the qca8k target entry in the FDB db.

A FDB entry can't be modified so it needs to be removed and insert again
with the new values.

To detect if an entry already exist, the SEARCH operation is used and we
check the aging of the entry. If the entry is not 0, the entry exist and
we proceed to delete it.

Current code have 2 main problem:
- The condition to check if the FDB entry exist is wrong and should be
  the opposite.
- When a FDB entry doesn't exist, aging was never actually set to the
  STATIC value resulting in allocating an invalid entry.

Fix both problem by adding aging support to the function, calling the
function with STATIC as aging by default and finally by correct the
condition to check if the entry actually exist.

Fixes: ba8f870dfa63 ("net: dsa: qca8k: add support for mdb_add/del")
Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
Cc: stable@...r.kernel.org
---
 drivers/net/dsa/qca/qca8k-common.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/qca/qca8k-common.c b/drivers/net/dsa/qca/qca8k-common.c
index 8c2dc0e48ff4..4909603d07c8 100644
--- a/drivers/net/dsa/qca/qca8k-common.c
+++ b/drivers/net/dsa/qca/qca8k-common.c
@@ -244,7 +244,7 @@ void qca8k_fdb_flush(struct qca8k_priv *priv)
 }
 
 static int qca8k_fdb_search_and_insert(struct qca8k_priv *priv, u8 port_mask,
-				       const u8 *mac, u16 vid)
+				       const u8 *mac, u16 vid, u8 aging)
 {
 	struct qca8k_fdb fdb = { 0 };
 	int ret;
@@ -261,10 +261,12 @@ static int qca8k_fdb_search_and_insert(struct qca8k_priv *priv, u8 port_mask,
 		goto exit;
 
 	/* Rule exist. Delete first */
-	if (!fdb.aging) {
+	if (fdb.aging) {
 		ret = qca8k_fdb_access(priv, QCA8K_FDB_PURGE, -1);
 		if (ret)
 			goto exit;
+	} else {
+		fdb.aging = aging;
 	}
 
 	/* Add port to fdb portmask */
@@ -810,7 +812,8 @@ int qca8k_port_mdb_add(struct dsa_switch *ds, int port,
 	const u8 *addr = mdb->addr;
 	u16 vid = mdb->vid;
 
-	return qca8k_fdb_search_and_insert(priv, BIT(port), addr, vid);
+	return qca8k_fdb_search_and_insert(priv, BIT(port), addr, vid,
+					   QCA8K_ATU_STATUS_STATIC);
 }
 
 int qca8k_port_mdb_del(struct dsa_switch *ds, int port,
-- 
2.40.1