drivers/net/sk98lin/uboot_skb.c

   1 /*
   2  * Definitions for the 'struct sk_buff' memory handlers in U-Boot.
   3  *
   4  * (C) Copyright 2003
   5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #include <config.h>
  27 #include <common.h>
  28 #include "u-boot_compat.h"
  29
  30 #define MAX_SKB         50
  31
  32 static struct sk_buff *sk_table[MAX_SKB];
  33
  34
  35 struct sk_buff * alloc_skb(u32 size, int dummy)
  36 {
  37         int i;
  38         struct sk_buff * ret = NULL;
  39
  40         for (i = 0; i < MAX_SKB; i++)
  41         {
  42                 if (sk_table[i])
  43                 {
  44                                 /* Already allocated.
  45                                  */
  46                         continue;
  47                 }
  48
  49                 sk_table[i] = malloc(sizeof(struct sk_buff));
  50                 if (! sk_table[i])
  51                 {
  52                         printf("alloc_skb: malloc failed\n");
  53                         break;
  54                 }
  55
  56                 memset(sk_table[i], 0, sizeof(struct sk_buff));
  57                 sk_table[i]->data = sk_table[i]->data_unaligned =
  58                                                             malloc(size + 16);
  59                 if (! sk_table[i]->data)
  60                 {
  61                         printf("alloc_skb: malloc failed\n");
  62                         free(sk_table[i]);
  63                         sk_table[i] = NULL;
  64                         break;
  65                 }
  66
  67                 sk_table[i]->data += 16 - ((u32)sk_table[i]->data & 15);
  68                 sk_table[i]->len = size;
  69
  70                 break;
  71         }
  72
  73         if (i < MAX_SKB)
  74         {
  75                 ret = sk_table[i];
  76         }
  77
  78         if (! ret)
  79         {
  80                 printf("Unable to allocate skb!\n");
  81         }
  82
  83         return ret;
  84 }
  85
  86 void dev_kfree_skb_any(struct sk_buff *skb)
  87 {
  88         int i;
  89
  90         for (i = 0; i < MAX_SKB; i++)
  91         {
  92                 if (sk_table[i] != skb)
  93                 {
  94                         continue;
  95                 }
  96
  97                 free(skb->data_unaligned);
  98                 free(skb);
  99                 sk_table[i] = NULL;
 100                 break;
 101         }
 102
 103         if (i == MAX_SKB)
 104         {
 105                 printf("SKB allocation error!\n");
 106         }
 107 }
 108
 109 void skb_reserve(struct sk_buff *skb, unsigned int len)
 110 {
 111         skb->data+=len;
 112 }
 113
 114 void skb_put(struct sk_buff *skb, unsigned int len)
 115 {
 116         skb->len+=len;
 117 }