netdev - [PATCH net-next 07/15] net: dsa: sja1105: exit sja1105_vlan

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Date:   Sun, 10 May 2020 19:42:47 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com
Cc:     davem@...emloft.net, kuba@...nel.org, rmk+kernel@...linux.org.uk,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 07/15] net: dsa: sja1105: exit sja1105_vlan_filtering when called multiple times

From: Vladimir Oltean <vladimir.oltean@....com>

VLAN filtering is a global property for sja1105, and that means that we
rely on the DSA core to not call us more than once.

But we need to introduce some per-port state for the tagger, namely the
xmit_tpid, and the best place to do that is where the xmit_tpid changes,
namely in sja1105_vlan_filtering. So at the moment, exit early from the
function to avoid unnecessarily resetting the switch for each port call.
Then we'll change the xmit_tpid prior to the early exit in the next
patch.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/dsa/sja1105/sja1105_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 15db37067bf1..8cf17238bc6a 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -2141,6 +2141,9 @@ static int sja1105_vlan_filtering(struct dsa_switch *ds, int port, bool enabled)
 	else
 		state = SJA1105_VLAN_FILTERING_FULL;

+	if (priv->vlan_state == state)
+		return 0;
+
 	priv->vlan_state = state;

 	table = &priv->static_config.tables[BLK_IDX_GENERAL_PARAMS];
-- 
2.17.1