1c0e751391
- on ar724x, rx buffers can be aligned with an offset of 2, which keeps the ip header aligned - alignment offset is only added if the ar8216 workaround is not active and the phy driver does not advertise its own packet alignment - ar71xx and ar91xx can not handle rx alignment offsets, however taking a hit on unaligned exceptions seems to have less overhead than re-aligning the data for large packets - use memmove to re-align small packets, if necessary tested on ar9132, ar7240 and ar7242 based devices without ar8216 headers SVN-Revision: 20892
45 lines
974 B
C
45 lines
974 B
C
/*
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* Atheros AR71xx built-in ethernet mac driver
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* Special support for the Atheros ar8216 switch chip
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*
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* Copyright (C) 2009-2010 Gabor Juhos <juhosg@openwrt.org>
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*
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* Based on Atheros' AG7100 driver
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include "ag71xx.h"
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#define AR8216_PACKET_TYPE_MASK 0xf
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#define AR8216_PACKET_TYPE_NORMAL 0
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#define AR8216_HEADER_LEN 2
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void ag71xx_add_ar8216_header(struct ag71xx *ag, struct sk_buff *skb)
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{
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skb_push(skb, AR8216_HEADER_LEN);
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skb->data[0] = 0x10;
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skb->data[1] = 0x80;
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}
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int ag71xx_remove_ar8216_header(struct ag71xx *ag, struct sk_buff *skb,
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int pktlen)
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{
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u8 type;
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type = skb->data[1] & AR8216_PACKET_TYPE_MASK;
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switch (type) {
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case AR8216_PACKET_TYPE_NORMAL:
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break;
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default:
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return -EINVAL;
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}
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skb_pull(skb, AR8216_HEADER_LEN);
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return 0;
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}
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