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  1. /*
  2.  * Copyright (c) 2009 Lukas Mejdrech
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup packet
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  Packet server implementation.
  35.  */
  36.  
  37. #include <align.h>
  38. #include <async.h>
  39. #include <errno.h>
  40. #include <futex.h>
  41. //#include <stdio.h>
  42. #include <unistd.h>
  43.  
  44. #include <ipc/ipc.h>
  45. #include <sys/mman.h>
  46.  
  47. #include "../../err.h"
  48. #include "../../messages.h"
  49.  
  50. #include "packet.h"
  51. #include "packet_header.h"
  52. #include "packet_server.h"
  53.  
  54. /** The default address length reserved for new packets.
  55.  */
  56. #define DEFAULT_ADDR_LEN    32
  57.  
  58. /** The default prefix reserved for new packets.
  59.  */
  60. #define DEFAULT_PREFIX      0
  61.  
  62. /** The default suffix reserved for new packets.
  63.  */
  64. #define DEFAULT_SUFFIX      0
  65.  
  66. /** Returns the packet identifier message parameter.
  67.  */
  68. #define IPC_GET_ID( call )          ( packet_id_t ) IPC_GET_ARG1( * call )
  69.  
  70. /** Returns the maximal content length message parameter.
  71.  */
  72. #define IPC_GET_CONTENT( call )     ( size_t ) IPC_GET_ARG1( * call )
  73.  
  74. /** Returns the maximal address length message parameter.
  75.  */
  76. #define IPC_GET_ADDR_LEN( call )    ( size_t ) IPC_GET_ARG2( * call )
  77.  
  78. /** Returns the maximal prefix length message parameter.
  79.  */
  80. #define IPC_GET_PREFIX( call )      ( size_t ) IPC_GET_ARG3( * call )
  81.  
  82. /** Returns the maximal suffix length message parameter.
  83.  */
  84. #define IPC_GET_SUFFIX( call )      ( size_t ) IPC_GET_ARG4( * call )
  85.  
  86. #define FREE_QUEUES_COUNT   7
  87.  
  88. /** Packet server global data.
  89.  */
  90. static struct{
  91.     /** Safety lock.
  92.      */
  93.     futex_t lock;
  94.     /** Free packet queues.
  95.      */
  96.     packet_t free[ FREE_QUEUES_COUNT ];
  97.     /** Packet length upper bounds of the free packet queues.
  98.      *  The maximal lengths of packets in each queue in the ascending order.
  99.      *  The last queue is not limited.
  100.      */
  101.     int sizes[ FREE_QUEUES_COUNT ];
  102.     /** Total packets allocated.
  103.      */
  104.     unsigned int count;
  105. } ps_globals = {
  106.     { 1 },
  107.     { NULL, NULL, NULL, NULL, NULL, NULL, NULL },
  108.     { PAGE_SIZE, PAGE_SIZE * 2, PAGE_SIZE * 4, PAGE_SIZE * 8, PAGE_SIZE * 16, PAGE_SIZE * 32, PAGE_SIZE * 64 },
  109.     0
  110. };
  111.  
  112. /** Releases the packet and returns it to the appropriate free packet queue.
  113.  *  Should be used only when the global data are locked.
  114.  *  @param packet The packet to be released. Input parameter.
  115.  */
  116. void packet_release( packet_t packet );
  117.  
  118. /** Returns the packet of dimensions at least as given.
  119.  *  Tries to reuse free packets first.
  120.  *  Creates a&nbsp;new packet aligned to the memory page size if none available.
  121.  *  Locks the global data during its processing.
  122.  *  @param addr_len The source and destination addresses maximal length in bytes. Input parameter.
  123.  *  @param max_prefix The maximal prefix length in bytes. Input parameter.
  124.  *  @param max_content The maximal content length in bytes. Input parameter.
  125.  *  @param max_suffix The maximal suffix length in bytes. Input parameter.
  126.  *  @returns The packet of dimensions at least as given.
  127.  *  @returns NULL if there is not enough memory left.
  128.  */
  129. packet_t packet_get( size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix );
  130.  
  131. /** Creates a&nbsp;new packet of dimensions at least as given.
  132.  *  Should be used only when the global data are locked.
  133.  *  @param length The total length of the packet, including the header, the addresses and the data of the packet. Input parameter.
  134.  *  @param addr_len The source and destination addresses maximal length in bytes. Input parameter.
  135.  *  @param max_prefix The maximal prefix length in bytes. Input parameter.
  136.  *  @param max_content The maximal content length in bytes. Input parameter.
  137.  *  @param max_suffix The maximal suffix length in bytes. Input parameter.
  138.  *  @returns The packet of dimensions at least as given.
  139.  *  @returns NULL if there is not enough memory left.
  140.  */
  141. packet_t    packet_create( size_t length, size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix );
  142.  
  143. /** Initializes the packet according to the given dimensions.
  144.  *  @param packet The packet to be initialized. Input parameter.
  145.  *  @param addr_len The source and destination addresses maximal length in bytes. Input parameter.
  146.  *  @param max_prefix The maximal prefix length in bytes. Input parameter.
  147.  *  @param max_content The maximal content length in bytes. Input parameter.
  148.  *  @param max_suffix The maximal suffix length in bytes. Input parameter.
  149.  */
  150. void    packet_init( packet_t packet, size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix );
  151.  
  152. /** Shares the packet memory block.
  153.  *  @param packet The packet to be shared.
  154.  *  @returns EOK on success.
  155.  *  @returns EINVAL if the packet is not valid.
  156.  *  @returns EINVAL if the calling module does not accept the memory.
  157.  *  @returns ENOMEM if the desired and actual sizes differ.
  158.  *  @returns Other error codes as defined for the ipc_share_in_finalize() function.
  159.  */
  160. int packet_reply( const packet_t packet );
  161.  
  162. int packet_server_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  163.     packet_t packet;
  164.  
  165.     * answer_count = 0;
  166.     switch( IPC_GET_METHOD( * call )){
  167.         case IPC_M_PHONE_HUNGUP:
  168.             return EOK;
  169.         case NET_PACKET_CREATE_1:
  170.             packet = packet_get( DEFAULT_ADDR_LEN, DEFAULT_PREFIX, IPC_GET_CONTENT( call ), DEFAULT_SUFFIX );
  171.             if( ! packet ) return ENOMEM;
  172.             * answer_count = 2;
  173.             IPC_SET_ARG1( * answer, packet->packet_id );
  174.             IPC_SET_ARG2( * answer, packet->length );
  175.             return EOK;
  176.         case NET_PACKET_CREATE_4:
  177.             packet = packet_get( IPC_GET_ADDR_LEN( call ), IPC_GET_PREFIX( call ), IPC_GET_CONTENT( call ), IPC_GET_SUFFIX( call ));
  178.             if( ! packet ) return ENOMEM;
  179.             * answer_count = 2;
  180.             IPC_SET_ARG1( * answer, packet->packet_id );
  181.             IPC_SET_ARG2( * answer, packet->length );
  182.             return EOK;
  183.         case NET_PACKET_GET:
  184.             packet = pm_find( IPC_GET_ID( call ));
  185.             if( ! packet_is_valid( packet )) return ENOENT;
  186.             return packet_reply( packet );
  187.         case NET_PACKET_GET_SIZE:
  188.             packet = pm_find( IPC_GET_ID( call ));
  189.             if( ! packet_is_valid( packet )) return ENOENT;
  190.             * answer_count = 1;
  191.             IPC_SET_ARG1( * answer, packet->length );
  192.             return EOK;
  193.         case NET_PACKET_RELEASE:
  194.             packet = pm_find( IPC_GET_ID( call ));
  195.             if( ! packet_is_valid( packet )) return ENOENT;
  196.             futex_down( & ps_globals.lock );
  197.             pq_destroy( packet, packet_release );
  198.             futex_up( & ps_globals.lock );
  199.             return EOK;
  200.     }
  201.     return ENOTSUP;
  202. }
  203.  
  204. void packet_release( packet_t packet ){
  205.     int index;
  206.  
  207.     for( index = 0; ( index < FREE_QUEUES_COUNT - 1 ) && ( packet->length > ps_globals.sizes[ index ] ); ++ index );
  208.     ps_globals.free[ index ] = pq_add( ps_globals.free[ index ], packet, packet->length, packet->length );
  209. }
  210.  
  211. packet_t packet_get( size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix ){
  212.     int index;
  213.     packet_t packet;
  214.     size_t length;
  215.  
  216.     length = ALIGN_UP( sizeof( struct packet ) + 2 * addr_len + max_prefix + max_content + max_suffix, PAGE_SIZE );
  217.     futex_down( & ps_globals.lock );
  218.     for( index = 0; index < FREE_QUEUES_COUNT - 1; ++ index ){
  219.         if( length <= ps_globals.sizes[ index ] ){
  220.             packet = ps_globals.free[ index ];
  221.             while( packet_is_valid( packet ) && ( packet->length < length )){
  222.                 packet = pm_find( packet->next );
  223.             }
  224.             if( packet ){
  225.                 packet_init( packet, addr_len, max_prefix, max_content, max_suffix );
  226.                 futex_up( & ps_globals.lock );
  227.                 return packet;
  228.             }
  229.         }
  230.     }
  231.     packet = packet_create( length, addr_len, max_prefix, max_content, max_suffix );
  232.     futex_up( & ps_globals.lock );
  233.     return packet;
  234. }
  235.  
  236. packet_t packet_create( size_t length, size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix ){
  237.     ERROR_DECLARE;
  238.  
  239.     packet_t    packet;
  240.  
  241.     // already locked
  242.     packet = ( packet_t ) mmap( NULL, length, PROTO_READ | PROTO_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0 );
  243.     if( packet == MAP_FAILED ) return NULL;
  244.     ++ ps_globals.count;
  245.     packet->packet_id = ps_globals.count;
  246.     packet->length = length;
  247.     packet_init( packet, addr_len, max_prefix, max_content, max_suffix );
  248.     packet->magic_value = PACKET_MAGIC_VALUE;
  249.     if( ERROR_OCCURRED( pm_add( packet ))){
  250.         munmap( packet, packet->length );
  251.         return NULL;
  252.     }
  253.     packet_release( packet );
  254.     return packet;
  255. }
  256.  
  257. void packet_init( packet_t packet, size_t addr_len, size_t max_prefix, size_t max_content, size_t max_suffix ){
  258.     packet->order = 0;
  259.     packet->metric = 0;
  260.     packet->previous = 0;
  261.     packet->next = 0;
  262.     packet->addr_len = addr_len;
  263.     packet->src_addr = sizeof( struct packet );
  264.     packet->dest_addr = packet->src_addr + packet->addr_len;
  265.     packet->max_prefix = max_prefix;
  266.     packet->max_content = max_content;
  267.     packet->data_start = packet->dest_addr + packet->addr_len + packet->max_prefix;
  268.     packet->data_end = packet->data_start;
  269. }
  270.  
  271. int packet_reply( const packet_t packet ){
  272.     ipc_callid_t    callid;
  273.     size_t          size;
  274.  
  275.     if( ! packet_is_valid( packet )) return EINVAL;
  276.     if( ipc_share_in_receive( & callid, & size ) <= 0 ) return EINVAL;
  277.     if( size != packet->length ) return ENOMEM;
  278.     return ipc_share_in_finalize( callid, packet, PROTO_READ | PROTO_WRITE );
  279. }
  280.  
  281. /** @}
  282.  */
  283.