nes-proj/os/net/queuebuf.c

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/*
* Copyright (c) 2006, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
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* Implementation of the Packet queue buffers
* \author
* Adam Dunkels <adam@sics.se>
*/
/**
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* \addtogroup queuebuf
* @{
*/
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#include "contiki-net.h"
#include "net/queuebuf.h"
#if WITH_SWAP
#include "cfs/cfs.h"
#endif
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#include <string.h> /* for memcpy() */
/* Structure pointing to a buffer either stored
in RAM or swapped in CFS */
struct queuebuf {
#if QUEUEBUF_DEBUG
struct queuebuf *next;
const char *file;
int line;
clock_time_t time;
#endif /* QUEUEBUF_DEBUG */
#if WITH_SWAP
enum {IN_RAM, IN_CFS} location;
union {
#endif
struct queuebuf_data *ram_ptr;
#if WITH_SWAP
int swap_id;
};
#endif
};
/* The actual queuebuf data */
struct queuebuf_data {
uint8_t data[PACKETBUF_SIZE];
uint16_t len;
struct packetbuf_attr attrs[PACKETBUF_NUM_ATTRS];
struct packetbuf_addr addrs[PACKETBUF_NUM_ADDRS];
};
MEMB(bufmem, struct queuebuf, QUEUEBUF_NUM);
MEMB(buframmem, struct queuebuf_data, QUEUEBUFRAM_NUM);
#if WITH_SWAP
/* Swapping allows to store up to QUEUEBUF_NUM - QUEUEBUFRAM_NUM
queuebufs in CFS. The swap is made of several large CFS files.
Every buffer stored in CFS has a swap id, referring to a specific
offset in one of these files. */
#define NQBUF_FILES 4
#define NQBUF_PER_FILE 256
#define QBUF_FILE_SIZE (NQBUF_PER_FILE*sizeof(struct queuebuf_data))
#define NQBUF_ID (NQBUF_PER_FILE * NQBUF_FILES)
struct qbuf_file {
int fd;
int usage;
int renewable;
};
/* A statically allocated queuebuf used as a cache for swapped qbufs */
static struct queuebuf_data tmpdata;
/* A pointer to the qbuf associated to the data in tmpdata */
static struct queuebuf *tmpdata_qbuf = NULL;
/* The swap id counter */
static int next_swap_id = 0;
/* The swap files */
static struct qbuf_file qbuf_files[NQBUF_FILES];
/* The timer used to renew files during inactivity periods */
static struct ctimer renew_timer;
#endif
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#if QUEUEBUF_DEBUG
#include "lib/list.h"
LIST(queuebuf_list);
#endif /* QUEUEBUF_DEBUG */
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#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#ifdef QUEUEBUF_CONF_STATS
#define QUEUEBUF_STATS QUEUEBUF_CONF_STATS
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#else
#define QUEUEBUF_STATS 0
#endif /* QUEUEBUF_CONF_STATS */
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#if QUEUEBUF_STATS
uint8_t queuebuf_len, queuebuf_max_len;
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#endif /* QUEUEBUF_STATS */
#if WITH_SWAP
/*---------------------------------------------------------------------------*/
static void
qbuf_renew_file(int file)
{
int ret;
char name[2];
name[0] = 'a' + file;
name[1] = '\0';
if(qbuf_files[file].renewable == 1) {
PRINTF("qbuf_renew_file: removing file %d\n", file);
cfs_remove(name);
}
ret = cfs_open(name, CFS_READ | CFS_WRITE);
if(ret == -1) {
PRINTF("qbuf_renew_file: cfs open error\n");
}
qbuf_files[file].fd = ret;
qbuf_files[file].usage = 0;
qbuf_files[file].renewable = 0;
}
/*---------------------------------------------------------------------------*/
/* Renews every file with renewable flag set */
static void
qbuf_renew_all(void *unused)
{
int i;
for(i=0; i<NQBUF_FILES; i++) {
if(qbuf_files[i].renewable == 1) {
qbuf_renew_file(i);
}
}
}
/*---------------------------------------------------------------------------*/
/* Removes a queuebuf from its swap file */
static void
queuebuf_remove_from_file(int swap_id)
{
int fileid;
if(swap_id != -1) {
fileid = swap_id / NQBUF_PER_FILE;
qbuf_files[fileid].usage--;
/* The file is full but doesn't contain any more queuebuf, mark it as renewable */
if(qbuf_files[fileid].usage == 0 && fileid != next_swap_id / NQBUF_PER_FILE) {
qbuf_files[fileid].renewable = 1;
/* This file is renewable, set a timer to renew files */
ctimer_set(&renew_timer, 0, qbuf_renew_all, NULL);
}
if(tmpdata_qbuf->swap_id == swap_id) {
tmpdata_qbuf->swap_id = -1;
}
}
}
/*---------------------------------------------------------------------------*/
static int
get_new_swap_id(void)
{
int fileid;
int swap_id = next_swap_id;
fileid = swap_id / NQBUF_PER_FILE;
if(swap_id % NQBUF_PER_FILE == 0) { /* This is the first id in the file */
if(qbuf_files[fileid].renewable) {
qbuf_renew_file(fileid);
}
if(qbuf_files[fileid].usage>0) {
return -1;
}
}
qbuf_files[fileid].usage++;
next_swap_id = (next_swap_id+1) % NQBUF_ID;
return swap_id;
}
/*---------------------------------------------------------------------------*/
/* Flush tmpdata to CFS */
static int
queuebuf_flush_tmpdata(void)
{
int fileid, fd, ret;
cfs_offset_t offset;
if(tmpdata_qbuf) {
queuebuf_remove_from_file(tmpdata_qbuf->swap_id);
tmpdata_qbuf->swap_id = get_new_swap_id();
if(tmpdata_qbuf->swap_id == -1) {
return -1;
}
fileid = tmpdata_qbuf->swap_id / NQBUF_PER_FILE;
offset = (tmpdata_qbuf->swap_id % NQBUF_PER_FILE) * sizeof(struct queuebuf_data);
fd = qbuf_files[fileid].fd;
ret = cfs_seek(fd, offset, CFS_SEEK_SET);
if(ret == -1) {
PRINTF("queuebuf_flush_tmpdata: cfs seek error\n");
return -1;
}
ret = cfs_write(fd, &tmpdata, sizeof(struct queuebuf_data));
if(ret == -1) {
PRINTF("queuebuf_flush_tmpdata: cfs write error\n");
return -1;
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
/* If the queuebuf is in CFS, load it to tmpdata */
static struct queuebuf_data *
queuebuf_load_to_ram(struct queuebuf *b)
{
int fileid, fd, ret;
cfs_offset_t offset;
if(b->location == IN_RAM) { /* the qbuf is loacted in RAM */
return b->ram_ptr;
} else { /* the qbuf is located in CFS */
if(tmpdata_qbuf && tmpdata_qbuf->swap_id == b->swap_id) { /* the qbuf is already in tmpdata */
return &tmpdata;
} else { /* the qbuf needs to be loaded from CFS */
tmpdata_qbuf = b;
/* read the qbuf from CFS */
fileid = b->swap_id / NQBUF_PER_FILE;
offset = (b->swap_id % NQBUF_PER_FILE) * sizeof(struct queuebuf_data);
fd = qbuf_files[fileid].fd;
ret = cfs_seek(fd, offset, CFS_SEEK_SET);
if(ret == -1) {
PRINTF("queuebuf_load_to_ram: cfs seek error\n");
}
ret = cfs_read(fd, &tmpdata, sizeof(struct queuebuf_data));
if(ret == -1) {
PRINTF("queuebuf_load_to_ram: cfs read error\n");
}
return &tmpdata;
}
}
}
#else /* WITH_SWAP */
/*---------------------------------------------------------------------------*/
static struct queuebuf_data *
queuebuf_load_to_ram(struct queuebuf *b)
{
return b->ram_ptr;
}
#endif /* WITH_SWAP */
/*---------------------------------------------------------------------------*/
void
queuebuf_init(void)
{
#if WITH_SWAP
int i;
for(i=0; i<NQBUF_FILES; i++) {
qbuf_files[i].renewable = 1;
qbuf_renew_file(i);
}
#endif
memb_init(&buframmem);
memb_init(&bufmem);
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#if QUEUEBUF_STATS
queuebuf_max_len = 0;
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#endif /* QUEUEBUF_STATS */
}
/*---------------------------------------------------------------------------*/
int
queuebuf_numfree(void)
{
return memb_numfree(&bufmem);
}
/*---------------------------------------------------------------------------*/
#if QUEUEBUF_DEBUG
struct queuebuf *
queuebuf_new_from_packetbuf_debug(const char *file, int line)
#else /* QUEUEBUF_DEBUG */
struct queuebuf *
queuebuf_new_from_packetbuf(void)
#endif /* QUEUEBUF_DEBUG */
{
struct queuebuf *buf;
struct queuebuf_data *buframptr;
buf = memb_alloc(&bufmem);
if(buf != NULL) {
#if QUEUEBUF_DEBUG
list_add(queuebuf_list, buf);
buf->file = file;
buf->line = line;
buf->time = clock_time();
#endif /* QUEUEBUF_DEBUG */
buf->ram_ptr = memb_alloc(&buframmem);
#if WITH_SWAP
/* If the allocation failed, store the qbuf in swap files */
if(buf->ram_ptr != NULL) {
buf->location = IN_RAM;
buframptr = buf->ram_ptr;
} else {
buf->location = IN_CFS;
buf->swap_id = -1;
tmpdata_qbuf = buf;
buframptr = &tmpdata;
}
#else
if(buf->ram_ptr == NULL) {
PRINTF("queuebuf_new_from_packetbuf: could not queuebuf data\n");
memb_free(&bufmem, buf);
return NULL;
}
buframptr = buf->ram_ptr;
#endif
buframptr->len = packetbuf_copyto(buframptr->data);
packetbuf_attr_copyto(buframptr->attrs, buframptr->addrs);
#if WITH_SWAP
if(buf->location == IN_CFS) {
if(queuebuf_flush_tmpdata() == -1) {
/* We were unable to write the data in the swap */
memb_free(&bufmem, buf);
return NULL;
}
}
#endif
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#if QUEUEBUF_STATS
++queuebuf_len;
PRINTF("#A q=%d\n", queuebuf_len);
if(queuebuf_len > queuebuf_max_len) {
queuebuf_max_len = queuebuf_len;
}
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#endif /* QUEUEBUF_STATS */
} else {
PRINTF("queuebuf_new_from_packetbuf: could not allocate a queuebuf\n");
}
return buf;
}
/*---------------------------------------------------------------------------*/
void
queuebuf_update_attr_from_packetbuf(struct queuebuf *buf)
{
struct queuebuf_data *buframptr = queuebuf_load_to_ram(buf);
packetbuf_attr_copyto(buframptr->attrs, buframptr->addrs);
#if WITH_SWAP
if(buf->location == IN_CFS) {
queuebuf_flush_tmpdata();
}
#endif
}
/*---------------------------------------------------------------------------*/
void
queuebuf_update_from_packetbuf(struct queuebuf *buf)
{
struct queuebuf_data *buframptr = queuebuf_load_to_ram(buf);
packetbuf_attr_copyto(buframptr->attrs, buframptr->addrs);
buframptr->len = packetbuf_copyto(buframptr->data);
#if WITH_SWAP
if(buf->location == IN_CFS) {
queuebuf_flush_tmpdata();
}
#endif
}
/*---------------------------------------------------------------------------*/
void
queuebuf_free(struct queuebuf *buf)
{
if(memb_inmemb(&bufmem, buf)) {
#if WITH_SWAP
if(buf->location == IN_RAM) {
memb_free(&buframmem, buf->ram_ptr);
} else {
queuebuf_remove_from_file(buf->swap_id);
}
#else
memb_free(&buframmem, buf->ram_ptr);
#endif
memb_free(&bufmem, buf);
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#if QUEUEBUF_STATS
--queuebuf_len;
PRINTF("#A q=%d\n", queuebuf_len);
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#endif /* QUEUEBUF_STATS */
#if QUEUEBUF_DEBUG
list_remove(queuebuf_list, buf);
#endif /* QUEUEBUF_DEBUG */
}
}
/*---------------------------------------------------------------------------*/
void
queuebuf_to_packetbuf(struct queuebuf *b)
{
if(memb_inmemb(&bufmem, b)) {
struct queuebuf_data *buframptr = queuebuf_load_to_ram(b);
packetbuf_copyfrom(buframptr->data, buframptr->len);
packetbuf_attr_copyfrom(buframptr->attrs, buframptr->addrs);
}
}
/*---------------------------------------------------------------------------*/
void *
queuebuf_dataptr(struct queuebuf *b)
{
if(memb_inmemb(&bufmem, b)) {
struct queuebuf_data *buframptr = queuebuf_load_to_ram(b);
return buframptr->data;
}
return NULL;
}
/*---------------------------------------------------------------------------*/
int
queuebuf_datalen(struct queuebuf *b)
{
struct queuebuf_data *buframptr = queuebuf_load_to_ram(b);
return buframptr->len;
}
/*---------------------------------------------------------------------------*/
linkaddr_t *
queuebuf_addr(struct queuebuf *b, uint8_t type)
{
struct queuebuf_data *buframptr = queuebuf_load_to_ram(b);
return &buframptr->addrs[type - PACKETBUF_ADDR_FIRST].addr;
}
/*---------------------------------------------------------------------------*/
packetbuf_attr_t
queuebuf_attr(struct queuebuf *b, uint8_t type)
{
struct queuebuf_data *buframptr = queuebuf_load_to_ram(b);
return buframptr->attrs[type].val;
}
/*---------------------------------------------------------------------------*/
void
queuebuf_debug_print(void)
{
#if QUEUEBUF_DEBUG
struct queuebuf *q;
printf("queuebuf_list: ");
for(q = list_head(queuebuf_list); q != NULL;
q = list_item_next(q)) {
printf("%s,%d,%lu ", q->file, q->line, q->time);
}
printf("\n");
#endif /* QUEUEBUF_DEBUG */
}
/*---------------------------------------------------------------------------*/
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/** @} */