| // SPDX-License-Identifier: GPL-2.0+ |
| * net/dsa/tag_trailer.c - Trailer tag format handling |
| * Copyright (c) 2008-2009 Marvell Semiconductor |
| #include <linux/etherdevice.h> |
| #define TRAILER_NAME "trailer" |
| static struct sk_buff *trailer_xmit(struct sk_buff *skb, struct net_device *dev) |
| struct dsa_port *dp = dsa_slave_to_port(dev); |
| trailer = skb_put(skb, 4); |
| trailer[1] = 1 << dp->index; |
| static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev) |
| trailer = skb_tail_pointer(skb) - 4; |
| if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 || |
| (trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00) |
| source_port = trailer[1] & 7; |
| skb->dev = dsa_master_find_slave(dev, 0, source_port); |
| if (pskb_trim_rcsum(skb, skb->len - 4)) |
| static const struct dsa_device_ops trailer_netdev_ops = { |
| .proto = DSA_TAG_PROTO_TRAILER, |
| MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_TRAILER, TRAILER_NAME); |
| module_dsa_tag_driver(trailer_netdev_ops); |