1 files changed, 125 insertions, 0 deletions
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
new file mode 100644
index 000000000..e5ff7c34e
--- /dev/null
+++ b/net/dsa/tag_qca.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/bitfield.h>
+#include <net/dsa.h>
+#include <linux/dsa/tag_qca.h>
+
+#include "tag.h"
+
+#define QCA_NAME "qca"
+
+static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct dsa_port *dp = dsa_slave_to_port(dev);
+	__be16 *phdr;
+	u16 hdr;
+
+	skb_push(skb, QCA_HDR_LEN);
+
+	dsa_alloc_etype_header(skb, QCA_HDR_LEN);
+	phdr = dsa_etype_header_pos_tx(skb);
+
+	/* Set the version field, and set destination port information */
+	hdr = FIELD_PREP(QCA_HDR_XMIT_VERSION, QCA_HDR_VERSION);
+	hdr |= QCA_HDR_XMIT_FROM_CPU;
+	hdr |= FIELD_PREP(QCA_HDR_XMIT_DP_BIT, BIT(dp->index));
+
+	*phdr = htons(hdr);
+
+	return skb;
+}
+
+static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
+{
+	struct qca_tagger_data *tagger_data;
+	struct dsa_port *dp = dev->dsa_ptr;
+	struct dsa_switch *ds = dp->ds;
+	u8 ver, pk_type;
+	__be16 *phdr;
+	int port;
+	u16 hdr;
+
+	BUILD_BUG_ON(sizeof(struct qca_mgmt_ethhdr) != QCA_HDR_MGMT_HEADER_LEN + QCA_HDR_LEN);
+
+	tagger_data = ds->tagger_data;
+
+	if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
+		return NULL;
+
+	phdr = dsa_etype_header_pos_rx(skb);
+	hdr = ntohs(*phdr);
+
+	/* Make sure the version is correct */
+	ver = FIELD_GET(QCA_HDR_RECV_VERSION, hdr);
+	if (unlikely(ver != QCA_HDR_VERSION))
+		return NULL;
+
+	/* Get pk type */
+	pk_type = FIELD_GET(QCA_HDR_RECV_TYPE, hdr);
+
+	/* Ethernet mgmt read/write packet */
+	if (pk_type == QCA_HDR_RECV_TYPE_RW_REG_ACK) {
+		if (likely(tagger_data->rw_reg_ack_handler))
+			tagger_data->rw_reg_ack_handler(ds, skb);
+		return NULL;
+	}
+
+	/* Ethernet MIB counter packet */
+	if (pk_type == QCA_HDR_RECV_TYPE_MIB) {
+		if (likely(tagger_data->mib_autocast_handler))
+			tagger_data->mib_autocast_handler(ds, skb);
+		return NULL;
+	}
+
+	/* Get source port information */
+	port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, hdr);
+
+	skb->dev = dsa_master_find_slave(dev, 0, port);
+	if (!skb->dev)
+		return NULL;
+
+	/* Remove QCA tag and recalculate checksum */
+	skb_pull_rcsum(skb, QCA_HDR_LEN);
+	dsa_strip_etype_header(skb, QCA_HDR_LEN);
+
+	return skb;
+}
+
+static int qca_tag_connect(struct dsa_switch *ds)
+{
+	struct qca_tagger_data *tagger_data;
+
+	tagger_data = kzalloc(sizeof(*tagger_data), GFP_KERNEL);
+	if (!tagger_data)
+		return -ENOMEM;
+
+	ds->tagger_data = tagger_data;
+
+	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_NAME,
+	.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,
+	.promisc_on_master = true,
+};
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA, QCA_NAME);
+
+module_dsa_tag_driver(qca_netdev_ops);