source: mainline/uspace/lib/net/generic/packet_remote.c@ 38aaacc2

/*
 * 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 client interface implementation for standalone remote modules.
 *  @see packet_client.h
 */

#include <async.h>
#include <errno.h>
#include <ipc/ipc.h>
#include <sys/mman.h>

#include <net_err.h>
#include <net_messages.h>
#include <packet/packet.h>
#include <packet/packet_client.h>
#include <packet/packet_header.h>
#include <packet/packet_messages.h>

/** Obtains the packet from the packet server as the shared memory block.
 *  Creates the local packet mapping as well.
 *  @param[in] phone The packet server module phone.
 *  @param[out] packet The packet reference pointer to store the received packet reference.
 *  @param[in] packet_id The packet identifier.
 *  @param[in] size The packet total size in bytes.
 *  @returns EOK on success.
 *  @returns Other error codes as defined for the pm_add() function.
 *  @returns Other error codes as defined for the async_share_in_start() function.
 */
int packet_return(int phone, packet_ref packet, packet_id_t packet_id, size_t size);

int packet_translate(int phone, packet_ref packet, packet_id_t packet_id){
        ERROR_DECLARE;

        ipcarg_t size;
        packet_t next;

        if(! packet){
                return EINVAL;
        }
        *packet = pm_find(packet_id);
        if(!(*packet)){
                ERROR_PROPAGATE(async_req_1_1(phone, NET_PACKET_GET_SIZE, packet_id, &size));
                ERROR_PROPAGATE(packet_return(phone, packet, packet_id, size));
        }
        if((** packet).next){
                return packet_translate(phone, &next, (** packet).next);
        }else return EOK;
}

int packet_return(int phone, packet_ref packet, packet_id_t packet_id, size_t size){
        ERROR_DECLARE;

        aid_t message;
        ipc_call_t answer;
        ipcarg_t result;

        message = async_send_1(phone, NET_PACKET_GET, packet_id, &answer);
        *packet = (packet_t) as_get_mappable_page(size);
        if(ERROR_OCCURRED(async_share_in_start_0_0(phone, * packet, size))
                || ERROR_OCCURRED(pm_add(*packet))){
                munmap(*packet, size);
                async_wait_for(message, NULL);
                return ERROR_CODE;
        }
        async_wait_for(message, &result);
        return result;
}

packet_t packet_get_4(int phone, size_t max_content, size_t addr_len, size_t max_prefix, size_t max_suffix){
        ERROR_DECLARE;

        ipcarg_t packet_id;
        ipcarg_t size;
        packet_t packet;

        if(ERROR_OCCURRED(async_req_4_2(phone, NET_PACKET_CREATE_4, max_content, addr_len, max_prefix, max_suffix, &packet_id, &size))){
                return NULL;
        }
        packet = pm_find(packet_id);
        if(! packet){
                if(ERROR_OCCURRED(packet_return(phone, &packet, packet_id, size))){
                        return NULL;
                }
        }
        return packet;
}

packet_t packet_get_1(int phone, size_t content){
        ERROR_DECLARE;

        ipcarg_t packet_id;
        ipcarg_t size;
        packet_t packet;

        if(ERROR_OCCURRED(async_req_1_2(phone, NET_PACKET_CREATE_1, content, &packet_id, &size))){
                return NULL;
        }
        packet = pm_find(packet_id);
        if(! packet){
                if(ERROR_OCCURRED(packet_return(phone, &packet, packet_id, size))){
                        return NULL;
                }
        }
        return packet;
}

void pq_release(int phone, packet_id_t packet_id){
        async_msg_1(phone, NET_PACKET_RELEASE, packet_id);
}

/** @}
 */