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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [redboot/] [v2_0/] [src/] [net/] [pktbuf.c] - Blame information for rev 773

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//==========================================================================
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//
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//      net/pktbuf.c
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//
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//      Stand-alone network packet support for RedBoot
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//
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//==========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s):    gthomas
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// Contributors: gthomas
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// Date:         2000-07-14
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// Purpose:      
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// Description:  
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//              
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// This code is part of RedBoot (tm).
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include <redboot.h>
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#include <net/net.h>
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#define MAX_PKTBUF CYGNUM_REDBOOT_NETWORKING_MAX_PKTBUF
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#define BUFF_STATS 1
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#if BUFF_STATS
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int max_alloc = 0;
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int num_alloc = 0;
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int num_free  = 0;
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#endif
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static pktbuf_t  pktbuf_list[MAX_PKTBUF];
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static word      bufdata[MAX_PKTBUF][ETH_MAX_PKTLEN/2 + 1];
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static pktbuf_t *free_list;
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/*
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 * Initialize the free list.
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 */
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void
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__pktbuf_init(void)
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{
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    int  i;
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    word *p;
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    static int init = 0;
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    if (init) return;
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    init = 1;
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    for (i = 0; i < MAX_PKTBUF; i++) {
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        p = bufdata[i];
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        if ((((unsigned long)p) & 2) != 0)
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            ++p;
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        pktbuf_list[i].buf = p;
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        pktbuf_list[i].bufsize = ETH_MAX_PKTLEN;
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        pktbuf_list[i].next = free_list;
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        free_list = &pktbuf_list[i];
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    }
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}
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void
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__pktbuf_dump(void)
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{
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    int i;
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    for (i = 0; i < MAX_PKTBUF; i++) {
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        diag_printf("Buf[%d]/%p: buf: %p, len: %d/%d, next: %p\n",
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                    i,
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                    (void*)&pktbuf_list[i],
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                    (void*)pktbuf_list[i].buf,
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                    pktbuf_list[i].bufsize,
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                    pktbuf_list[i].pkt_bytes,
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                    (void*)pktbuf_list[i].next);
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    }
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    diag_printf("Free list = %p\n", (void*)free_list);
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}
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/*
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 * simple pktbuf allocation
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 */
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pktbuf_t *
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__pktbuf_alloc(int nbytes)
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{
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    pktbuf_t *p = free_list;
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    if (p) {
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        free_list = p->next;
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        p->ip_hdr  = (ip_header_t *)p->buf;
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        p->tcp_hdr = (tcp_header_t *)(p->ip_hdr + 1);
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        p->pkt_bytes = 0;
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#if BUFF_STATS
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        ++num_alloc;
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        if ((num_alloc - num_free) > max_alloc)
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            max_alloc = num_alloc - num_free;
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#endif
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    }
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    return p;
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}
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/*
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 * free a pktbuf.
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 */
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void
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__pktbuf_free(pktbuf_t *pkt)
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{
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#if BUFF_STATS
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    --num_alloc;
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#endif
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#ifdef BSP_LOG
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    {
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        int i;
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        word *p;
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        for (i = 0; i < MAX_PKTBUF; i++) {
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            p = bufdata[i];
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            if ((((unsigned long)p) & 2) == 0)
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                ++p;
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            if (p == (word *)pkt)
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                break;
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        }
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        if (i < MAX_PKTBUF) {
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            BSPLOG(bsp_log("__pktbuf_free: bad pkt[%x].\n", pkt));
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            BSPLOG(while(1));
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        }
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    }
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#endif
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    pkt->next = free_list;
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    free_list = pkt;
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}
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