2 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <linux/etherdevice.h>
19 #define QCA_HDR_VERSION 0x2
21 #define QCA_HDR_RECV_VERSION_MASK GENMASK(15, 14)
22 #define QCA_HDR_RECV_VERSION_S 14
23 #define QCA_HDR_RECV_PRIORITY_MASK GENMASK(13, 11)
24 #define QCA_HDR_RECV_PRIORITY_S 11
25 #define QCA_HDR_RECV_TYPE_MASK GENMASK(10, 6)
26 #define QCA_HDR_RECV_TYPE_S 6
27 #define QCA_HDR_RECV_FRAME_IS_TAGGED BIT(3)
28 #define QCA_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0)
30 #define QCA_HDR_XMIT_VERSION_MASK GENMASK(15, 14)
31 #define QCA_HDR_XMIT_VERSION_S 14
32 #define QCA_HDR_XMIT_PRIORITY_MASK GENMASK(13, 11)
33 #define QCA_HDR_XMIT_PRIORITY_S 11
34 #define QCA_HDR_XMIT_CONTROL_MASK GENMASK(10, 8)
35 #define QCA_HDR_XMIT_CONTROL_S 8
36 #define QCA_HDR_XMIT_FROM_CPU BIT(7)
37 #define QCA_HDR_XMIT_DP_BIT_MASK GENMASK(6, 0)
39 static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
41 struct dsa_slave_priv *p = netdev_priv(dev);
44 if (skb_cow_head(skb, QCA_HDR_LEN) < 0)
47 skb_push(skb, QCA_HDR_LEN);
49 memmove(skb->data, skb->data + QCA_HDR_LEN, 2 * ETH_ALEN);
50 phdr = (u16 *)(skb->data + 2 * ETH_ALEN);
52 /* Set the version field, and set destination port information */
53 hdr = QCA_HDR_VERSION << QCA_HDR_XMIT_VERSION_S |
54 QCA_HDR_XMIT_FROM_CPU |
62 static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
63 struct packet_type *pt)
65 struct dsa_switch_tree *dst = dev->dsa_ptr;
66 struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
67 struct dsa_switch *ds;
72 if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
75 /* The QCA header is added by the switch between src addr and Ethertype
76 * At this point, skb->data points to ethertype so header should be
79 phdr = (__be16 *)(skb->data - 2);
82 /* Make sure the version is correct */
83 ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S;
84 if (unlikely(ver != QCA_HDR_VERSION))
87 /* Remove QCA tag and recalculate checksum */
88 skb_pull_rcsum(skb, QCA_HDR_LEN);
89 memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - QCA_HDR_LEN,
90 ETH_HLEN - QCA_HDR_LEN);
92 /* This protocol doesn't support cascading multiple switches so it's
93 * safe to assume the switch is first in the tree
99 /* Get source port information */
100 port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
101 if (!ds->ports[port].netdev)
104 if (unlikely(ds->cpu_port_mask & BIT(port)))
107 /* Update skb & forward the frame accordingly */
108 skb->dev = ds->ports[port].netdev;
113 const struct dsa_device_ops qca_netdev_ops = {
114 .xmit = qca_tag_xmit,