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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP/] [include/] [lwip/] [pbuf.h] - Blame information for rev 606

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1 606 jeremybenn
/*
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 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without modification,
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 * are permitted provided that the following conditions are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright notice,
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 *    this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 *    this list of conditions and the following disclaimer in the documentation
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 *    and/or other materials provided with the distribution.
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 * 3. The name of the author may not be used to endorse or promote products
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 *    derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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 * OF SUCH DAMAGE.
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 *
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 * This file is part of the lwIP TCP/IP stack.
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 *
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 * Author: Adam Dunkels <adam@sics.se>
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 *
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 */
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#ifndef __LWIP_PBUF_H__
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#define __LWIP_PBUF_H__
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#include "arch/cc.h"
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#define PBUF_TRANSPORT_HLEN 20
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#define PBUF_IP_HLEN        20
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typedef enum {
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  PBUF_TRANSPORT,
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  PBUF_IP,
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  PBUF_LINK,
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  PBUF_RAW
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} pbuf_layer;
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typedef enum {
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  PBUF_RAM,
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  PBUF_ROM,
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  PBUF_REF,
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  PBUF_POOL
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} pbuf_flag;
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/* Definitions for the pbuf flag field. These are NOT the flags that
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 * are passed to pbuf_alloc(). */
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#define PBUF_FLAG_RAM   0x00U    /* Flags that pbuf data is stored in RAM */
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#define PBUF_FLAG_ROM   0x01U    /* Flags that pbuf data is stored in ROM */
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#define PBUF_FLAG_POOL  0x02U    /* Flags that the pbuf comes from the pbuf pool */
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#define PBUF_FLAG_REF   0x04U    /* Flags thet the pbuf payload refers to RAM */
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/** indicates this packet was broadcast on the link */
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#define PBUF_FLAG_LINK_BROADCAST 0x80U
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struct pbuf {
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  /** next pbuf in singly linked pbuf chain */
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  struct pbuf *next;
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  /** pointer to the actual data in the buffer */
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  void *payload;
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  /**
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   * total length of this buffer and all next buffers in chain
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   * belonging to the same packet.
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   *
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   * For non-queue packet chains this is the invariant:
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   * p->tot_len == p->len + (p->next? p->next->tot_len: 0)
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   */
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  u16_t tot_len;
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  /** length of this buffer */
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  u16_t len;
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  /** flags telling the type of pbuf, see PBUF_FLAG_ */
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  u16_t flags;
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  /**
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   * the reference count always equals the number of pointers
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   * that refer to this pbuf. This can be pointers from an application,
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   * the stack itself, or pbuf->next pointers from a chain.
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   */
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  u16_t ref;
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};
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void pbuf_init(void);
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struct pbuf *pbuf_alloc(pbuf_layer l, u16_t size, pbuf_flag flag);
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void pbuf_realloc(struct pbuf *p, u16_t size);
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u8_t pbuf_header(struct pbuf *p, s16_t header_size);
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void pbuf_ref(struct pbuf *p);
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void pbuf_ref_chain(struct pbuf *p);
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u8_t pbuf_free(struct pbuf *p);
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u8_t pbuf_clen(struct pbuf *p);
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void pbuf_cat(struct pbuf *h, struct pbuf *t);
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void pbuf_chain(struct pbuf *h, struct pbuf *t);
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struct pbuf *pbuf_take(struct pbuf *f);
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struct pbuf *pbuf_dechain(struct pbuf *p);
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void pbuf_queue(struct pbuf *p, struct pbuf *n);
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struct pbuf * pbuf_dequeue(struct pbuf *p);
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#endif /* __LWIP_PBUF_H__ */

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