From:   Daniel Machon <daniel.machon@microchip.com>
To:     <netdev@vger.kernel.org>
CC:     <davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
        <pabeni@redhat.com>, <lars.povlsen@microchip.com>,
        <Steen.Hegelund@microchip.com>, <daniel.machon@microchip.com>,
        <UNGLinuxDriver@microchip.com>, <joe@perches.com>,
        <error27@gmail.com>, <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH net] net: microchip: sparx5: fix deletion of existing DSCP mappings
Date:   Tue, 7 Mar 2023 12:21:03 +0100
Message-ID: <20230307112103.2733285-1-daniel.machon@microchip.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
Precedence: bulk

Fix deletion of existing DSCP mappings in the APP table.

Adding and deleting DSCP entries are replicated per-port, since the
mapping table is global for all ports in the chip. Whenever a mapping
for a DSCP value already exists, the old mapping is deleted first.
However, it is only deleted for the specified port. Fix this by calling
sparx5_dcb_ieee_delapp() instead of dcb_ieee_delapp() as it ought to be.

Reproduce:

// Map and remap DSCP value 63
$ dcb app add dev eth0 dscp-prio 63:1
$ dcb app add dev eth0 dscp-prio 63:2

$ dcb app show dev eth0 dscp-prio
dscp-prio 63:2

$ dcb app show dev eth1 dscp-prio
dscp-prio 63:1 63:2 <-- 63:1 should not be there

Fixes: 8dcf69a64118 ("net: microchip: sparx5: add support for offloading dscp table")
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
---
 .../ethernet/microchip/sparx5/sparx5_dcb.c    | 32 +++++++++----------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c b/drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c
index 871a3e62f852..2d763664dcda 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c
@@ -249,6 +249,21 @@ static int sparx5_dcb_ieee_dscp_setdel(struct net_device *dev,
 	return 0;
 }
 
+static int sparx5_dcb_ieee_delapp(struct net_device *dev, struct dcb_app *app)
+{
+	int err;
+
+	if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
+		err = sparx5_dcb_ieee_dscp_setdel(dev, app, dcb_ieee_delapp);
+	else
+		err = dcb_ieee_delapp(dev, app);
+
+	if (err < 0)
+		return err;
+
+	return sparx5_dcb_app_update(dev);
+}
+
 static int sparx5_dcb_ieee_setapp(struct net_device *dev, struct dcb_app *app)
 {
 	struct dcb_app app_itr;
@@ -264,7 +279,7 @@ static int sparx5_dcb_ieee_setapp(struct net_device *dev, struct dcb_app *app)
 	if (prio) {
 		app_itr = *app;
 		app_itr.priority = prio;
-		dcb_ieee_delapp(dev, &app_itr);
+		sparx5_dcb_ieee_delapp(dev, &app_itr);
 	}
 
 	if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
@@ -281,21 +296,6 @@ static int sparx5_dcb_ieee_setapp(struct net_device *dev, struct dcb_app *app)
 	return err;
 }
 
-static int sparx5_dcb_ieee_delapp(struct net_device *dev, struct dcb_app *app)
-{
-	int err;
-
-	if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
-		err = sparx5_dcb_ieee_dscp_setdel(dev, app, dcb_ieee_delapp);
-	else
-		err = dcb_ieee_delapp(dev, app);
-
-	if (err < 0)
-		return err;
-
-	return sparx5_dcb_app_update(dev);
-}
-
 static int sparx5_dcb_setapptrust(struct net_device *dev, u8 *selectors,
 				  int nselectors)
 {
-- 
2.34.1