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//==========================================================================

//

//      net/pktbuf.c

//

//      Stand-alone network packet support for RedBoot

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas

// Date:         2000-07-14

// Purpose:      

// Description:  

//              

// This code is part of RedBoot (tm).

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <redboot.h>

#include <net/net.h>

#define MAX_PKTBUF CYGNUM_REDBOOT_NETWORKING_MAX_PKTBUF

#define BUFF_STATS 1

#if BUFF_STATS

int max_alloc = 0;

int num_alloc = 0;

int num_free  = 0;

#endif

static pktbuf_t  pktbuf_list[MAX_PKTBUF];

static word      bufdata[MAX_PKTBUF][ETH_MAX_PKTLEN/2 + 1];

static pktbuf_t *free_list;

/*

 * Initialize the free list.

 */

void

__pktbuf_init(void)

{

    int  i;

    word *p;

    static int init = 0;

    if (init) return;

    init = 1;

    for (i = 0; i < MAX_PKTBUF; i++) {

        p = bufdata[i];

        if ((((unsigned long)p) & 2) != 0)

            ++p;

        pktbuf_list[i].buf = p;

        pktbuf_list[i].bufsize = ETH_MAX_PKTLEN;

        pktbuf_list[i].next = free_list;

        free_list = &pktbuf_list[i];

    }

}

void

__pktbuf_dump(void)

{

    int i;

    for (i = 0; i < MAX_PKTBUF; i++) {

        diag_printf("Buf[%d]/%p: buf: %p, len: %d/%d, next: %p\n",

                    i,

                    (void*)&pktbuf_list[i],

                    (void*)pktbuf_list[i].buf,

                    pktbuf_list[i].bufsize,

                    pktbuf_list[i].pkt_bytes,

                    (void*)pktbuf_list[i].next);

    }

    diag_printf("Free list = %p\n", (void*)free_list);

}

/*

 * simple pktbuf allocation

 */

pktbuf_t *

__pktbuf_alloc(int nbytes)

{

    pktbuf_t *p = free_list;

    if (p) {

        free_list = p->next;

        p->ip_hdr  = (ip_header_t *)p->buf;

        p->tcp_hdr = (tcp_header_t *)(p->ip_hdr + 1);

        p->pkt_bytes = 0;

#if BUFF_STATS

        ++num_alloc;

        if ((num_alloc - num_free) > max_alloc)

            max_alloc = num_alloc - num_free;

#endif

    }

    return p;

}

/*

 * free a pktbuf.

 */

void

__pktbuf_free(pktbuf_t *pkt)

{

#if BUFF_STATS

    --num_alloc;

#endif

#ifdef BSP_LOG

    {

        int i;

        word *p;

        for (i = 0; i < MAX_PKTBUF; i++) {

            p = bufdata[i];

            if ((((unsigned long)p) & 2) == 0)

                ++p;

            if (p == (word *)pkt)

                break;

        }

        if (i < MAX_PKTBUF) {

            BSPLOG(bsp_log("__pktbuf_free: bad pkt[%x].\n", pkt));

            BSPLOG(while(1));

        }

    }

#endif

    pkt->next = free_list;

    free_list = pkt;

}