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54a52823 GM |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * XRS700x tag format handling | |
4 | * Copyright (c) 2008-2009 Marvell Semiconductor | |
5 | * Copyright (c) 2020 NovaTech LLC | |
6 | */ | |
7 | ||
8 | #include <linux/bitops.h> | |
9 | ||
10 | #include "dsa_priv.h" | |
11 | ||
12 | static struct sk_buff *xrs700x_xmit(struct sk_buff *skb, struct net_device *dev) | |
13 | { | |
bd62e6f5 | 14 | struct dsa_port *partner, *dp = dsa_slave_to_port(dev); |
54a52823 GM |
15 | u8 *trailer; |
16 | ||
17 | trailer = skb_put(skb, 1); | |
18 | trailer[0] = BIT(dp->index); | |
19 | ||
bd62e6f5 GM |
20 | if (dp->hsr_dev) |
21 | dsa_hsr_foreach_port(partner, dp->ds, dp->hsr_dev) | |
22 | if (partner != dp) | |
23 | trailer[0] |= BIT(partner->index); | |
24 | ||
54a52823 GM |
25 | return skb; |
26 | } | |
27 | ||
28 | static struct sk_buff *xrs700x_rcv(struct sk_buff *skb, struct net_device *dev, | |
29 | struct packet_type *pt) | |
30 | { | |
31 | int source_port; | |
32 | u8 *trailer; | |
33 | ||
34 | trailer = skb_tail_pointer(skb) - 1; | |
35 | ||
36 | source_port = ffs((int)trailer[0]) - 1; | |
37 | ||
38 | if (source_port < 0) | |
39 | return NULL; | |
40 | ||
41 | skb->dev = dsa_master_find_slave(dev, 0, source_port); | |
42 | if (!skb->dev) | |
43 | return NULL; | |
44 | ||
45 | if (pskb_trim_rcsum(skb, skb->len - 1)) | |
46 | return NULL; | |
47 | ||
48 | /* Frame is forwarded by hardware, don't forward in software. */ | |
49 | skb->offload_fwd_mark = 1; | |
50 | ||
51 | return skb; | |
52 | } | |
53 | ||
54 | static const struct dsa_device_ops xrs700x_netdev_ops = { | |
55 | .name = "xrs700x", | |
56 | .proto = DSA_TAG_PROTO_XRS700X, | |
57 | .xmit = xrs700x_xmit, | |
58 | .rcv = xrs700x_rcv, | |
59 | .overhead = 1, | |
60 | .tail_tag = true, | |
61 | }; | |
62 | ||
63 | MODULE_LICENSE("GPL"); | |
64 | MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_XRS700X); | |
65 | ||
66 | module_dsa_tag_driver(xrs700x_netdev_ops); |