linux-kernel - [net-next PATCH RFC v5 10/16] net: dsa: tag_qca: add support for handling mdio Ethernet and MIB packet

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Date:   Tue, 14 Dec 2021 22:10:05 +0100
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Ansuel Smith <ansuelsmth@...il.com>
Subject: [net-next PATCH RFC v5 10/16] net: dsa: tag_qca: add support for handling mdio Ethernet and MIB packet

Add connect/disconnect helper to assign private struct to the cpu port
dsa priv.
Add support for Ethernet mdio packet and MIB packet if the dsa driver
provide an handler to correctly parse and elaborate the data.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 include/linux/dsa/tag_qca.h |  7 +++++++
 net/dsa/tag_qca.c           | 35 +++++++++++++++++++++++++++++++++--
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/include/linux/dsa/tag_qca.h b/include/linux/dsa/tag_qca.h
index cd6275bac103..203e72dad9bb 100644
--- a/include/linux/dsa/tag_qca.h
+++ b/include/linux/dsa/tag_qca.h
@@ -69,4 +69,11 @@ struct mib_ethhdr {
 	__be16 hdr;		/* qca hdr */
 } __packed;
 
+struct tag_qca_priv {
+	void (*rw_reg_ack_handler)(struct dsa_port *dp,
+				   struct sk_buff *skb);
+	void (*mib_autocast_handler)(struct dsa_port *dp,
+				     struct sk_buff *skb);
+};
+
 #endif /* __TAG_QCA_H */
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index f5547d357647..59e04157f53b 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -32,11 +32,15 @@ static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
 
 static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
 {
+	struct dsa_port *dp = dev->dsa_ptr;
+	struct tag_qca_priv *priv;
 	u16  hdr, pk_type;
 	__be16 *phdr;
 	int port;
 	u8 ver;
 
+	priv = dp->ds->tagger_data;
+
 	if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
 		return NULL;
 
@@ -52,12 +56,18 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
 	pk_type = FIELD_GET(QCA_HDR_RECV_TYPE, hdr);
 
 	/* Ethernet MDIO read/write packet */
-	if (pk_type == QCA_HDR_RECV_TYPE_RW_REG_ACK)
+	if (pk_type == QCA_HDR_RECV_TYPE_RW_REG_ACK) {
+		if (priv->rw_reg_ack_handler)
+			priv->rw_reg_ack_handler(dp, skb);
 		return NULL;
+	}
 
 	/* Ethernet MIB counter packet */
-	if (pk_type == QCA_HDR_RECV_TYPE_MIB)
+	if (pk_type == QCA_HDR_RECV_TYPE_MIB) {
+		if (priv->mib_autocast_handler)
+			priv->mib_autocast_handler(dp, skb);
 		return NULL;
+	}
 
 	/* Remove QCA tag and recalculate checksum */
 	skb_pull_rcsum(skb, QCA_HDR_LEN);
@@ -73,9 +83,30 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
 	return skb;
 }
 
+static int qca_tag_connect(struct dsa_switch *ds)
+{
+	struct tag_qca_priv *priv;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	ds->tagger_data = priv;
+
+	return 0;
+}
+
+static void qca_tag_disconnect(struct dsa_switch *ds)
+{
+	kfree(ds->tagger_data);
+	ds->tagger_data = NULL;
+}
+
 static const struct dsa_device_ops qca_netdev_ops = {
 	.name	= "qca",
 	.proto	= DSA_TAG_PROTO_QCA,
+	.connect = qca_tag_connect,
+	.disconnect = qca_tag_disconnect,
 	.xmit	= qca_tag_xmit,
 	.rcv	= qca_tag_rcv,
 	.needed_headroom = QCA_HDR_LEN,
-- 
2.33.1