1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
6 #include <linux/etherdevice.h>
11 #define QCA_HDR_VERSION 0x2
13 #define QCA_HDR_RECV_VERSION_MASK GENMASK(15, 14)
14 #define QCA_HDR_RECV_VERSION_S 14
15 #define QCA_HDR_RECV_PRIORITY_MASK GENMASK(13, 11)
16 #define QCA_HDR_RECV_PRIORITY_S 11
17 #define QCA_HDR_RECV_TYPE_MASK GENMASK(10, 6)
18 #define QCA_HDR_RECV_TYPE_S 6
19 #define QCA_HDR_RECV_FRAME_IS_TAGGED BIT(3)
20 #define QCA_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0)
22 #define QCA_HDR_XMIT_VERSION_MASK GENMASK(15, 14)
23 #define QCA_HDR_XMIT_VERSION_S 14
24 #define QCA_HDR_XMIT_PRIORITY_MASK GENMASK(13, 11)
25 #define QCA_HDR_XMIT_PRIORITY_S 11
26 #define QCA_HDR_XMIT_CONTROL_MASK GENMASK(10, 8)
27 #define QCA_HDR_XMIT_CONTROL_S 8
28 #define QCA_HDR_XMIT_FROM_CPU BIT(7)
29 #define QCA_HDR_XMIT_DP_BIT_MASK GENMASK(6, 0)
31 static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
33 struct dsa_port *dp = dsa_slave_to_port(dev);
37 if (skb_cow_head(skb, QCA_HDR_LEN) < 0)
40 skb_push(skb, QCA_HDR_LEN);
42 memmove(skb->data, skb->data + QCA_HDR_LEN, 2 * ETH_ALEN);
43 phdr = (__be16 *)(skb->data + 2 * ETH_ALEN);
45 /* Set the version field, and set destination port information */
46 hdr = QCA_HDR_VERSION << QCA_HDR_XMIT_VERSION_S |
47 QCA_HDR_XMIT_FROM_CPU | BIT(dp->index);
54 static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
55 struct packet_type *pt)
62 if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
65 /* The QCA header is added by the switch between src addr and Ethertype
66 * At this point, skb->data points to ethertype so header should be
69 phdr = (__be16 *)(skb->data - 2);
72 /* Make sure the version is correct */
73 ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S;
74 if (unlikely(ver != QCA_HDR_VERSION))
77 /* Remove QCA tag and recalculate checksum */
78 skb_pull_rcsum(skb, QCA_HDR_LEN);
79 memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - QCA_HDR_LEN,
80 ETH_HLEN - QCA_HDR_LEN);
82 /* Get source port information */
83 port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
85 skb->dev = dsa_master_find_slave(dev, 0, port);
92 static const struct dsa_device_ops qca_netdev_ops = {
94 .proto = DSA_TAG_PROTO_QCA,
97 .overhead = QCA_HDR_LEN,
100 MODULE_LICENSE("GPL");
101 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
103 module_dsa_tag_driver(qca_netdev_ops);