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 dev
->stats
.tx_packets
++;
45 dev
->stats
.tx_bytes
+= skb
->len
;
47 if (skb_cow_head(skb
, 0) < 0)
50 skb_push(skb
, QCA_HDR_LEN
);
52 memmove(skb
->data
, skb
->data
+ QCA_HDR_LEN
, 2 * ETH_ALEN
);
53 phdr
= (u16
*)(skb
->data
+ 2 * ETH_ALEN
);
55 /* Set the version field, and set destination port information */
56 hdr
= QCA_HDR_VERSION
<< QCA_HDR_XMIT_VERSION_S
|
57 QCA_HDR_XMIT_FROM_CPU
|
65 static struct sk_buff
*qca_tag_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
66 struct packet_type
*pt
)
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 /* Get source port information */
93 port
= (hdr
& QCA_HDR_RECV_SOURCE_PORT_MASK
);
95 skb
->dev
= dsa_master_get_slave(dev
, 0, port
);
102 const struct dsa_device_ops qca_netdev_ops
= {
103 .xmit
= qca_tag_xmit
,