WebSVN – HelenOS – Diff – /branches/network/uspace/srv/net/structures/packet/packet_server.c


/*
 * Copyright (c) 2009 Lukas Mejdrech
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */
 
/** @addtogroup packet
 *  @{
 */
 
/** @file
 *  Packet server implementation.
 */
 
#include <align.h>
#include <async.h>
#include <errno.h>
#include <futex.h>
//#include <stdio.h>
#include <unistd.h>
 
#include <ipc/ipc.h>
#include <sys/mman.h>
 
#include "../../err.h"
#include "../../messages.h"
 
#include "packet.h"
#include "packet_header.h"
#include "packet_server.h"
 
/** The default address length reserved for new packets.
 */
#define DEFAULT_ADDR_LEN    32
 
/** The default prefix reserved for new packets.
 */
#define DEFAULT_PREFIX      0
 
/** The default suffix reserved for new packets.
 */
#define DEFAULT_SUFFIX      0
 
/** Returns the packet identifier message parameter.
 */
#define IPC_GET_ID( call )          ( packet_id_t ) IPC_GET_ARG1( * call )
 
/** Returns the maximal content length message parameter.
 */
#define IPC_GET_CONTENT( call )     ( size_t ) IPC_GET_ARG1( * call )
 
/** Returns the maximal address length message parameter.
 */
#define IPC_GET_ADDR_LEN( call )    ( size_t ) IPC_GET_ARG2( * call )
 
/** Returns the maximal prefix length message parameter.
 */
#define IPC_GET_PREFIX( call )      ( size_t ) IPC_GET_ARG3( * call )
 
/** Returns the maximal suffix length message parameter.
 */
#define IPC_GET_SUFFIX( call )      ( size_t ) IPC_GET_ARG4( * call )
 
#define FREE_QUEUES_COUNT   7
 
/** Packet server global data.
 */
static struct{
    /** Safety lock.
     */
    futex_t lock;
    /** Free packet queues.
     */
    packet_t free[ FREE_QUEUES_COUNT ];
    /** Packet length upper bounds of the free packet queues.
     *  The maximal lengths of packets in each queue in the ascending order.
     *  The last queue is not limited.
     */
    int sizes[ FREE_QUEUES_COUNT ];
    /** Total packets allocated.
     */
    unsigned int count;
} ps_globals = {
    { 1 },
    { NULL, NULL, NULL, NULL, NULL, NULL, NULL },
    { PAGE_SIZE, PAGE_SIZE * 2, PAGE_SIZE * 4, PAGE_SIZE * 8, PAGE_SIZE * 16, PAGE_SIZE * 32, PAGE_SIZE * 64 },
    0
};
 
/** Releases the packet and returns it to the appropriate free packet queue.
 *  Should be used only when the global data are locked.
 *  @param packet The packet to be released. Input parameter.
 */
void packet_release( packet_t packet );
 
/** Returns the packet of dimensions at least as given.
 *  Tries to reuse free packets first.
 *  Creates a&nbsp;new packet aligned to the memory page size if none available.
 *  Locks the global data during its processing.
 *  @param addr_len The source and destination addresses maximal length in bytes. Input parameter.
 *  @param max_prefix The maximal prefix length in bytes. Input parameter.
 *  @param max_content The maximal content length in bytes. Input parameter.
 *  @param max_suffix The maximal suffix length in bytes. Input parameter.
 *  @returns The packet of dimensions at least as given.
 *  @returns NULL if there is not enough memory left.
 */
packet_t packet_get( size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix );
 
/** Creates a&nbsp;new packet of dimensions at least as given.
 *  Should be used only when the global data are locked.
 *  @param length The total length of the packet, including the header, the addresses and the data of the packet. Input parameter.
 *  @param addr_len The source and destination addresses maximal length in bytes. Input parameter.
 *  @param max_prefix The maximal prefix length in bytes. Input parameter.
 *  @param max_content The maximal content length in bytes. Input parameter.
 *  @param max_suffix The maximal suffix length in bytes. Input parameter.
 *  @returns The packet of dimensions at least as given.
 *  @returns NULL if there is not enough memory left.
 */
packet_t    packet_create( size_t length, size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix );
 
/** Initializes the packet according to the given dimensions.
 *  @param packet The packet to be initialized. Input parameter.
 *  @param addr_len The source and destination addresses maximal length in bytes. Input parameter.
 *  @param max_prefix The maximal prefix length in bytes. Input parameter.
 *  @param max_content The maximal content length in bytes. Input parameter.
 *  @param max_suffix The maximal suffix length in bytes. Input parameter.
 */
void    packet_init( packet_t packet, size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix );
 
/** Shares the packet memory block.
 *  @param packet The packet to be shared.
 *  @returns EOK on success.
 *  @returns EINVAL if the packet is not valid.
 *  @returns EINVAL if the calling module does not accept the memory.
 *  @returns ENOMEM if the desired and actual sizes differ.
 *  @returns Other error codes as defined for the ipc_share_in_finalize() function.
 */
int packet_reply( const packet_t packet );
 
int packet_server_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
    packet_t packet;
 
    * answer_count = 0;
    switch( IPC_GET_METHOD( * call )){
        case IPC_M_PHONE_HUNGUP:
            return EOK;
        case NET_PACKET_CREATE_1:
            packet = packet_get( DEFAULT_ADDR_LEN, DEFAULT_PREFIX, IPC_GET_CONTENT( call ), DEFAULT_SUFFIX );
            if( ! packet ) return ENOMEM;
            * answer_count = 2;
            IPC_SET_ARG1( * answer, packet->packet_id );
            IPC_SET_ARG2( * answer, packet->length );
            return EOK;
        case NET_PACKET_CREATE_4:
            packet = packet_get( IPC_GET_ADDR_LEN( call ), IPC_GET_PREFIX( call ), IPC_GET_CONTENT( call ), IPC_GET_SUFFIX( call ));
            if( ! packet ) return ENOMEM;
            * answer_count = 2;
            IPC_SET_ARG1( * answer, packet->packet_id );
            IPC_SET_ARG2( * answer, packet->length );
            return EOK;
        case NET_PACKET_GET:
            packet = pm_find( IPC_GET_ID( call ));
            if( ! packet_is_valid( packet )) return ENOENT;
            return packet_reply( packet );
        case NET_PACKET_GET_SIZE:
            packet = pm_find( IPC_GET_ID( call ));
            if( ! packet_is_valid( packet )) return ENOENT;
            * answer_count = 1;
            IPC_SET_ARG1( * answer, packet->length );
            return EOK;
        case NET_PACKET_RELEASE:
            packet = pm_find( IPC_GET_ID( call ));
            if( ! packet_is_valid( packet )) return ENOENT;
            futex_down( & ps_globals.lock );
            pq_destroy( packet, packet_release );
            futex_up( & ps_globals.lock );
            return EOK;
    }
    return ENOTSUP;
}
 
void packet_release( packet_t packet ){
    int index;
 
    for( index = 0; ( index < FREE_QUEUES_COUNT - 1 ) && ( packet->length > ps_globals.sizes[ index ] ); ++ index );
    ps_globals.free[ index ] = pq_add( ps_globals.free[ index ], packet, packet->length, packet->length );
}
 
packet_t packet_get( size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix ){
    int index;
    packet_t packet;
    size_t length;
 
    length = ALIGN_UP( sizeof( struct packet ) + 2 * addr_len + max_prefix + max_content + max_suffix, PAGE_SIZE );
    futex_down( & ps_globals.lock );
    for( index = 0; index < FREE_QUEUES_COUNT - 1; ++ index ){
        if( length <= ps_globals.sizes[ index ] ){
            packet = ps_globals.free[ index ];
            while( packet_is_valid( packet ) && ( packet->length < length )){
                packet = pm_find( packet->next );
            }
            if( packet ){
                packet_init( packet, addr_len, max_prefix, max_content, max_suffix );
                futex_up( & ps_globals.lock );
                return packet;
            }
        }
    }
    packet = packet_create( length, addr_len, max_prefix, max_content, max_suffix );
    futex_up( & ps_globals.lock );
    return packet;
}
 
packet_t packet_create( size_t length, size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix ){
    ERROR_DECLARE;
 
    packet_t    packet;
 
    // already locked
    packet = ( packet_t ) mmap( NULL, length, PROTO_READ | PROTO_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0 );
    if( packet == MAP_FAILED ) return NULL;
    ++ ps_globals.count;
    packet->packet_id = ps_globals.count;
    packet->length = length;
    packet_init( packet, addr_len, max_prefix, max_content, max_suffix );
    packet->magic_value = PACKET_MAGIC_VALUE;
    if( ERROR_OCCURRED( pm_add( packet ))){
        munmap( packet, packet->length );
        return NULL;
    }
    packet_release( packet );
    return packet;
}
 
void packet_init( packet_t packet, size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix ){
    packet->order = 0;
    packet->metric = 0;
    packet->previous = 0;
    packet->next = 0;
    packet->addr_len = addr_len;
    packet->src_addr = sizeof( struct packet );
    packet->dest_addr = packet->src_addr + packet->addr_len;
    packet->max_prefix = max_prefix;
    packet->max_content = max_content;
    packet->data_start = packet->dest_addr + packet->addr_len + packet->max_prefix;
    packet->data_end = packet->data_start;
}
 
int packet_reply( const packet_t packet ){
    ipc_callid_t    callid;
    size_t          size;
 
    if( ! packet_is_valid( packet )) return EINVAL;
    if( ipc_share_in_receive( & callid, & size ) <= 0 ) return EINVAL;
    if( size != packet->length ) return ENOMEM;
    return ipc_share_in_finalize( callid, packet, PROTO_READ | PROTO_WRITE );
}
 
/** @}
 */
 
Subversion Repositories HelenOS

(root)/branches/network/uspace/srv/net/structures/packet/packet_server.c – Rev 3990 → 4192
