target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_ar8216.c

   1 /*
   2  *  Atheros AR71xx built-in ethernet mac driver
   3  *  Special support for the Atheros ar8216 switch chip
   4  *
   5  *  Copyright (C) 2009-2010 Gabor Juhos <juhosg@openwrt.org>
   6  *
   7  *  Based on Atheros' AG7100 driver
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #include "ag71xx.h"
  15
  16 #define AR8216_PACKET_TYPE_MASK         0xf
  17 #define AR8216_PACKET_TYPE_NORMAL       0
  18
  19 #define AR8216_HEADER_LEN       2
  20
  21 void ag71xx_add_ar8216_header(struct ag71xx *ag, struct sk_buff *skb)
  22 {
  23         skb_push(skb, AR8216_HEADER_LEN);
  24         skb->data[0] = 0x10;
  25         skb->data[1] = 0x80;
  26 }
  27
  28 int ag71xx_remove_ar8216_header(struct ag71xx *ag, struct sk_buff *skb,
  29                                 int pktlen)
  30 {
  31         u8 type;
  32
  33         type = skb->data[1] & AR8216_PACKET_TYPE_MASK;
  34         switch (type) {
  35         case AR8216_PACKET_TYPE_NORMAL:
  36                 break;
  37
  38         default:
  39                 return -EINVAL;
  40         }
  41
  42         skb_pull(skb, AR8216_HEADER_LEN);
  43         return 0;
  44 }