netdev - [PATCH] net: ethernet: ti: ale: ensure vlan/mdb deleted when no members

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Message-ID: <20191127155905.22921-1-grygorii.strashko@ti.com>
Date:   Wed, 27 Nov 2019 17:59:05 +0200
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     <netdev@...r.kernel.org>, "David S . Miller" <davem@...emloft.net>
CC:     Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Andrew Lunn <andrew@...n.ch>, Sekhar Nori <nsekhar@...com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: [PATCH] net: ethernet: ti: ale: ensure vlan/mdb deleted when no members

The recently updated ALE APIs cpsw_ale_del_mcast() and
cpsw_ale_del_vlan_modify() have an issue and will not delete ALE entry even
if VLAN/mcast group has no more members. Hence fix it here and delete ALE
entry if !port_mask.

The issue affected only new cpsw switchdev driver.

Fixes: e85c14370783 ("net: ethernet: ti: ale: modify vlan/mdb api for switchdev")
Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
---
 drivers/net/ethernet/ti/cpsw_ale.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw_ale.c b/drivers/net/ethernet/ti/cpsw_ale.c
index 929f3d3354e3..a5179ecfea05 100644
--- a/drivers/net/ethernet/ti/cpsw_ale.c
+++ b/drivers/net/ethernet/ti/cpsw_ale.c
@@ -396,12 +396,14 @@ int cpsw_ale_del_mcast(struct cpsw_ale *ale, const u8 *addr, int port_mask,
 	if (port_mask) {
 		mcast_members = cpsw_ale_get_port_mask(ale_entry,
 						       ale->port_mask_bits);
-		mcast_members &= ~port_mask;
-		cpsw_ale_set_port_mask(ale_entry, mcast_members,
+		port_mask = mcast_members & ~port_mask;
+	}
+
+	if (port_mask)
+		cpsw_ale_set_port_mask(ale_entry, port_mask,
 				       ale->port_mask_bits);
-	} else {
+	else
 		cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_FREE);
-	}
 
 	cpsw_ale_write(ale, idx, ale_entry);
 	return 0;
@@ -478,6 +480,10 @@ static void cpsw_ale_del_vlan_modify(struct cpsw_ale *ale, u32 *ale_entry,
 	members = cpsw_ale_get_vlan_member_list(ale_entry,
 						ale->vlan_field_bits);
 	members &= ~port_mask;
+	if (!members) {
+		cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_FREE);
+		return;
+	}
 
 	untag = cpsw_ale_get_vlan_untag_force(ale_entry,
 					      ale->vlan_field_bits);
-- 
2.17.1