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bd954b8260
It would be nice if tagging protocol drivers could include just the header they need, since they are (mostly) data path and isolated from most of the other DSA core code does. Create a tag.c and a tag.h file which are meant to support tagging protocol drivers. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* net/dsa/tag_trailer.c - Trailer tag format handling
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* Copyright (c) 2008-2009 Marvell Semiconductor
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*/
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#include <linux/etherdevice.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include "tag.h"
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#define TRAILER_NAME "trailer"
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static struct sk_buff *trailer_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_port *dp = dsa_slave_to_port(dev);
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u8 *trailer;
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trailer = skb_put(skb, 4);
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trailer[0] = 0x80;
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trailer[1] = 1 << dp->index;
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trailer[2] = 0x10;
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trailer[3] = 0x00;
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return skb;
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}
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static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev)
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{
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u8 *trailer;
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int source_port;
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if (skb_linearize(skb))
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return NULL;
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trailer = skb_tail_pointer(skb) - 4;
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if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 ||
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(trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00)
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return NULL;
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source_port = trailer[1] & 7;
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skb->dev = dsa_master_find_slave(dev, 0, source_port);
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if (!skb->dev)
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return NULL;
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if (pskb_trim_rcsum(skb, skb->len - 4))
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return NULL;
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return skb;
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}
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static const struct dsa_device_ops trailer_netdev_ops = {
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.name = TRAILER_NAME,
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.proto = DSA_TAG_PROTO_TRAILER,
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.xmit = trailer_xmit,
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.rcv = trailer_rcv,
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.needed_tailroom = 4,
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};
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_TRAILER, TRAILER_NAME);
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module_dsa_tag_driver(trailer_netdev_ops);
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