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- // 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>
- #include <linux/list.h>
- #include <linux/slab.h>
- #include "dsa_priv.h"
- static struct sk_buff *trailer_xmit(struct sk_buff *skb, struct net_device *dev)
- {
- struct dsa_port *dp = dsa_slave_to_port(dev);
- u8 *trailer;
- trailer = skb_put(skb, 4);
- trailer[0] = 0x80;
- trailer[1] = 1 << dp->index;
- trailer[2] = 0x10;
- trailer[3] = 0x00;
- return skb;
- }
- static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,
- struct packet_type *pt)
- {
- u8 *trailer;
- int source_port;
- if (skb_linearize(skb))
- return NULL;
- trailer = skb_tail_pointer(skb) - 4;
- if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 ||
- (trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00)
- return NULL;
- source_port = trailer[1] & 7;
- skb->dev = dsa_master_find_slave(dev, 0, source_port);
- if (!skb->dev)
- return NULL;
- if (pskb_trim_rcsum(skb, skb->len - 4))
- return NULL;
- return skb;
- }
- static const struct dsa_device_ops trailer_netdev_ops = {
- .name = "trailer",
- .proto = DSA_TAG_PROTO_TRAILER,
- .xmit = trailer_xmit,
- .rcv = trailer_rcv,
- .overhead = 4,
- .tail_tag = true,
- };
- MODULE_LICENSE("GPL");
- MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_TRAILER);
- module_dsa_tag_driver(trailer_netdev_ops);
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