| 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 "tag.h" |
|---|
| 11 | |
|---|
| 12 | #define XRS700X_NAME "xrs700x" |
|---|
| 13 | |
|---|
| 14 | static struct sk_buff *xrs700x_xmit(struct sk_buff *skb, struct net_device *dev) |
|---|
| 15 | { |
|---|
| 16 | struct dsa_port *partner, *dp = dsa_user_to_port(dev); |
|---|
| 17 | u8 *trailer; |
|---|
| 18 | |
|---|
| 19 | trailer = skb_put(skb, len: 1); |
|---|
| 20 | trailer[0] = BIT(dp->index); |
|---|
| 21 | |
|---|
| 22 | if (dp->hsr_dev) |
|---|
| 23 | dsa_hsr_foreach_port(partner, dp->ds, dp->hsr_dev) |
|---|
| 24 | if (partner != dp) |
|---|
| 25 | trailer[0] |= BIT(partner->index); |
|---|
| 26 | |
|---|
| 27 | return skb; |
|---|
| 28 | } |
|---|
| 29 | |
|---|
| 30 | static struct sk_buff *xrs700x_rcv(struct sk_buff *skb, struct net_device *dev) |
|---|
| 31 | { |
|---|
| 32 | int source_port; |
|---|
| 33 | u8 *trailer; |
|---|
| 34 | |
|---|
| 35 | trailer = skb_tail_pointer(skb) - 1; |
|---|
| 36 | |
|---|
| 37 | source_port = ffs((int)trailer[0]) - 1; |
|---|
| 38 | |
|---|
| 39 | if (source_port < 0) |
|---|
| 40 | return NULL; |
|---|
| 41 | |
|---|
| 42 | skb->dev = dsa_conduit_find_user(dev, device: 0, port: source_port); |
|---|
| 43 | if (!skb->dev) |
|---|
| 44 | return NULL; |
|---|
| 45 | |
|---|
| 46 | if (pskb_trim_rcsum(skb, len: skb->len - 1)) |
|---|
| 47 | return NULL; |
|---|
| 48 | |
|---|
| 49 | /* Frame is forwarded by hardware, don't forward in software. */ |
|---|
| 50 | dsa_default_offload_fwd_mark(skb); |
|---|
| 51 | |
|---|
| 52 | return skb; |
|---|
| 53 | } |
|---|
| 54 | |
|---|
| 55 | static const struct dsa_device_ops xrs700x_netdev_ops = { |
|---|
| 56 | .name = XRS700X_NAME, |
|---|
| 57 | .proto = DSA_TAG_PROTO_XRS700X, |
|---|
| 58 | .xmit = xrs700x_xmit, |
|---|
| 59 | .rcv = xrs700x_rcv, |
|---|
| 60 | .needed_tailroom = 1, |
|---|
| 61 | }; |
|---|
| 62 | |
|---|
| 63 | MODULE_DESCRIPTION("DSA tag driver for XRS700x switches" ); |
|---|
| 64 | MODULE_LICENSE("GPL" ); |
|---|
| 65 | MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_XRS700X, XRS700X_NAME); |
|---|
| 66 | |
|---|
| 67 | module_dsa_tag_driver(xrs700x_netdev_ops); |
|---|
| 68 | |
|---|
