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dfedd3b6 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
396138f0 LB |
2 | /* |
3 | * net/dsa/tag_trailer.c - Trailer tag format handling | |
e84665c9 | 4 | * Copyright (c) 2008-2009 Marvell Semiconductor |
396138f0 LB |
5 | */ |
6 | ||
7 | #include <linux/etherdevice.h> | |
8 | #include <linux/list.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
ea5dd34b | 10 | |
396138f0 LB |
11 | #include "dsa_priv.h" |
12 | ||
4ed70ce9 | 13 | static struct sk_buff *trailer_xmit(struct sk_buff *skb, struct net_device *dev) |
396138f0 | 14 | { |
d945097b | 15 | struct dsa_port *dp = dsa_slave_to_port(dev); |
396138f0 LB |
16 | u8 *trailer; |
17 | ||
ef3f72fe | 18 | trailer = skb_put(skb, 4); |
396138f0 | 19 | trailer[0] = 0x80; |
d945097b | 20 | trailer[1] = 1 << dp->index; |
396138f0 LB |
21 | trailer[2] = 0x10; |
22 | trailer[3] = 0x00; | |
23 | ||
ef3f72fe | 24 | return skb; |
396138f0 LB |
25 | } |
26 | ||
29a097b7 | 27 | static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev) |
396138f0 | 28 | { |
396138f0 LB |
29 | u8 *trailer; |
30 | int source_port; | |
31 | ||
396138f0 | 32 | if (skb_linearize(skb)) |
54709795 | 33 | return NULL; |
396138f0 LB |
34 | |
35 | trailer = skb_tail_pointer(skb) - 4; | |
36 | if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 || | |
fbd03513 | 37 | (trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00) |
54709795 | 38 | return NULL; |
396138f0 LB |
39 | |
40 | source_port = trailer[1] & 7; | |
3775b1b7 | 41 | |
2231c43b | 42 | skb->dev = dsa_master_find_slave(dev, 0, source_port); |
3775b1b7 | 43 | if (!skb->dev) |
54709795 | 44 | return NULL; |
396138f0 | 45 | |
349b71d6 ZJ |
46 | if (pskb_trim_rcsum(skb, skb->len - 4)) |
47 | return NULL; | |
396138f0 | 48 | |
a86d8bec | 49 | return skb; |
396138f0 LB |
50 | } |
51 | ||
f81a43e8 | 52 | static const struct dsa_device_ops trailer_netdev_ops = { |
875138f8 | 53 | .name = "trailer", |
056eed2f | 54 | .proto = DSA_TAG_PROTO_TRAILER, |
3e8a72d1 FF |
55 | .xmit = trailer_xmit, |
56 | .rcv = trailer_rcv, | |
4e500251 | 57 | .needed_tailroom = 4, |
396138f0 | 58 | }; |
0b42f033 | 59 | |
f18bba50 | 60 | MODULE_LICENSE("GPL"); |
0b42f033 | 61 | MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_TRAILER); |
d3b8c049 AL |
62 | |
63 | module_dsa_tag_driver(trailer_netdev_ops); |