1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
6 #include <linux/etherdevice.h>
7 #include <linux/bitfield.h>
9 #include <linux/dsa/tag_qca.h>
13 static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
15 struct dsa_port *dp = dsa_slave_to_port(dev);
19 skb_push(skb, QCA_HDR_LEN);
21 dsa_alloc_etype_header(skb, QCA_HDR_LEN);
22 phdr = dsa_etype_header_pos_tx(skb);
24 /* Set the version field, and set destination port information */
25 hdr = FIELD_PREP(QCA_HDR_XMIT_VERSION, QCA_HDR_VERSION);
26 hdr |= QCA_HDR_XMIT_FROM_CPU;
27 hdr |= FIELD_PREP(QCA_HDR_XMIT_DP_BIT, BIT(dp->index));
34 static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
36 struct qca_tagger_data *tagger_data;
37 struct dsa_port *dp = dev->dsa_ptr;
38 struct dsa_switch *ds = dp->ds;
44 BUILD_BUG_ON(sizeof(struct qca_mgmt_ethhdr) != QCA_HDR_MGMT_HEADER_LEN + QCA_HDR_LEN);
46 tagger_data = ds->tagger_data;
48 if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
51 phdr = dsa_etype_header_pos_rx(skb);
54 /* Make sure the version is correct */
55 ver = FIELD_GET(QCA_HDR_RECV_VERSION, hdr);
56 if (unlikely(ver != QCA_HDR_VERSION))
60 pk_type = FIELD_GET(QCA_HDR_RECV_TYPE, hdr);
62 /* Ethernet mgmt read/write packet */
63 if (pk_type == QCA_HDR_RECV_TYPE_RW_REG_ACK) {
64 if (likely(tagger_data->rw_reg_ack_handler))
65 tagger_data->rw_reg_ack_handler(ds, skb);
69 /* Ethernet MIB counter packet */
70 if (pk_type == QCA_HDR_RECV_TYPE_MIB) {
71 if (likely(tagger_data->mib_autocast_handler))
72 tagger_data->mib_autocast_handler(ds, skb);
76 /* Remove QCA tag and recalculate checksum */
77 skb_pull_rcsum(skb, QCA_HDR_LEN);
78 dsa_strip_etype_header(skb, QCA_HDR_LEN);
80 /* Get source port information */
81 port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, hdr);
83 skb->dev = dsa_master_find_slave(dev, 0, port);
90 static int qca_tag_connect(struct dsa_switch *ds)
92 struct qca_tagger_data *tagger_data;
94 tagger_data = kzalloc(sizeof(*tagger_data), GFP_KERNEL);
98 ds->tagger_data = tagger_data;
103 static void qca_tag_disconnect(struct dsa_switch *ds)
105 kfree(ds->tagger_data);
106 ds->tagger_data = NULL;
109 static const struct dsa_device_ops qca_netdev_ops = {
111 .proto = DSA_TAG_PROTO_QCA,
112 .connect = qca_tag_connect,
113 .disconnect = qca_tag_disconnect,
114 .xmit = qca_tag_xmit,
116 .needed_headroom = QCA_HDR_LEN,
117 .promisc_on_master = true,
120 MODULE_LICENSE("GPL");
121 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
123 module_dsa_tag_driver(qca_netdev_ops);