netdev - [RFC PATCH net-next 06/11] net: dsa: microchip: lan937x: get cascade tag protocol

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Date:   Thu, 2 Feb 2023 18:29:25 +0530
From:   Rakesh Sankaranarayanan <rakesh.sankaranarayanan@...rochip.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <andrew@...n.ch>, <f.fainelli@...il.com>, <olteanv@...il.com>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <woojung.huh@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>, <linux@...linux.org.uk>
Subject: [RFC PATCH net-next 06/11] net: dsa: microchip: lan937x: get cascade tag protocol

Update ksz_get_tag_protocol to return separate tag protocol if
switch is connected in cascade mode. Variable ds->dst->last_switch
will contain total number of switches registered. For cascaded
connection alone, this will be more than zero.

Signed-off-by: Rakesh Sankaranarayanan <rakesh.sankaranarayanan@...rochip.com>
---
 drivers/net/dsa/microchip/ksz_common.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index adf8391dd29f..2160a3e61a5a 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2567,9 +2567,13 @@ static enum dsa_tag_protocol ksz_get_tag_protocol(struct dsa_switch *ds,
 	    dev->chip_id == KSZ9567_CHIP_ID)
 		proto = DSA_TAG_PROTO_KSZ9477;
 
-	if (is_lan937x(dev))
+	if (is_lan937x(dev)) {
 		proto = DSA_TAG_PROTO_LAN937X_VALUE;
 
+		if (ds->dst->last_switch)
+			proto = DSA_TAG_PROTO_LAN937X_CASCADE_VALUE;
+	}
+
 	return proto;
 }
 
-- 
2.34.1