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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [redboot/] [v2_0/] [src/] [net/] [pktbuf.c] - Rev 256
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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; }
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