drivers/staging/otus/wrap_buf.c

   1 /*
   2  * Copyright (c) 2007-2008 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16 /*                                                                      */
  17 /*  Module Name : wrap_buf.c                                            */
  18 /*                                                                      */
  19 /*  Abstract                                                            */
  20 /*     This module contains wrapper functions for buffer management     */
  21 /*                                                                      */
  22 /*  NOTES                                                               */
  23 /*     Platform dependent.                                              */
  24 /*                                                                      */
  25 /************************************************************************/
  26
  27 #include "oal_dt.h"
  28 #include "usbdrv.h"
  29
  30
  31 #include <linux/netlink.h>
  32
  33 #include <net/iw_handler.h>
  34
  35
  36 /* Called to allocate buffer, must return a continue buffer space */
  37 zbuf_t *zfwBufAllocate(zdev_t *dev, u16_t len)
  38 {
  39     zbuf_t *buf;
  40
  41     /* Allocate SKB for packet*/
  42     buf = dev_alloc_skb(len);
  43
  44     return buf;
  45 }
  46
  47
  48 /* Called to free buffer, replace below 3 functions */
  49 void zfwBufFree(zdev_t *dev, zbuf_t *buf, u16_t status)
  50 {
  51     dev_kfree_skb_any(buf);
  52 }
  53
  54 /* Called to adjust buffer size and head pointer */
  55 u16_t zfwBufRemoveHead(zdev_t *dev, zbuf_t *buf, u16_t size)
  56 {
  57     /* zm_assert(buf->len > size); */
  58
  59     buf->data += size;
  60     buf->len -= size;
  61     return 0;
  62 }
  63
  64
  65
  66
  67 /* return tail if head==NULL, called to chain multiple buffer together */
  68 /* Used to chain Rx buffer to form a frame. if the prepared Rx buffer  */
  69 /* is greater than an ethernet frame(1518+32 byte), then this function    */
  70 /* will only be called with head=NULL.                                 */
  71 u16_t zfwBufChain(zdev_t *dev, zbuf_t **head, zbuf_t *tail)
  72 {
  73
  74     *head = tail;
  75     return 0;
  76 }
  77
  78
  79 /* Called when doing infra-bss forwarding */
  80 u16_t zfwBufCopy(zdev_t *dev, zbuf_t *dst, zbuf_t *src)
  81 {
  82     memcpy(dst->data, src->data, src->len);
  83     dst->tail = dst->data;
  84     skb_put(dst, src->len);
  85     return 0;
  86 }
  87
  88
  89 /* Called to adjust buffer size and tail pointer */
  90 u16_t zfwBufSetSize(zdev_t *dev, zbuf_t *buf, u16_t size)
  91 {
  92 #ifdef NET_SKBUFF_DATA_USES_OFFSET
  93     buf->tail = 0;
  94     buf->len = 0;
  95 #else
  96     buf->tail = buf->data;
  97     buf->len = 0;
  98 #endif
  99
 100     skb_put(buf, size);
 101     return 0;
 102 }
 103
 104 u16_t zfwBufGetSize(zdev_t *dev, zbuf_t *buf)
 105 {
 106     return buf->len;
 107 }
 108
 109 void zfwCopyBufContext(zdev_t *dev, zbuf_t *source, zbuf_t *dst)
 110 {
 111 }