linux-kernel - [PATCH net-next v6 2/5] net: dsa: tag

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Message-ID: <20260131021854.3405036-3-mmyangfl@gmail.com>
Date: Sat, 31 Jan 2026 10:18:48 +0800
From: David Yang <mmyangfl@...il.com>
To: netdev@...r.kernel.org
Cc: David Yang <mmyangfl@...il.com>,
	Andrew Lunn <andrew@...n.ch>,
	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>,
	Simon Horman <horms@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next v6 2/5] net: dsa: tag_yt921x: add priority support

Required by DCB/QoS support of the switch driver, since the rx packets
will have non-zero priorities.

Signed-off-by: David Yang <mmyangfl@...il.com>
---
 net/dsa/tag_yt921x.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/dsa/tag_yt921x.c b/net/dsa/tag_yt921x.c
index 098863d491ff..aefef8c770e3 100644
--- a/net/dsa/tag_yt921x.c
+++ b/net/dsa/tag_yt921x.c
@@ -69,7 +69,9 @@ yt921x_tag_xmit(struct sk_buff *skb, struct net_device *netdev)
 	tag[0] = htons(ETH_P_YT921X);
 	/* VLAN tag unrelated when TX */
 	tag[1] = 0;
-	tag[2] = 0;
+	ctrl = YT921X_TAG_CODE(YT921X_TAG_CODE_FORWARD) | YT921X_TAG_CODE_EN |
+	       YT921X_TAG_PRIO(skb->priority);
+	tag[2] = htons(ctrl);
 	ctrl = YT921X_TAG_TX_PORTS(dsa_xmit_port_mask(skb, netdev)) |
 	       YT921X_TAG_PORT_EN;
 	tag[3] = htons(ctrl);
@@ -112,6 +114,8 @@ yt921x_tag_rcv(struct sk_buff *skb, struct net_device *netdev)
 		return NULL;
 	}
 
+	skb->priority = FIELD_GET(YT921X_TAG_PRIO_M, rx);
+
 	if (!(rx & YT921X_TAG_CODE_EN)) {
 		dev_warn_ratelimited(&netdev->dev,
 				     "Tag code not enabled in rx packet\n");
-- 
2.51.0