/*
 * Copyright (c) 2004-2007 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */


#include "ompi_config.h"
#include "ompi/constants.h"
#include "opal/event/event.h"
#include "opal/util/if.h"
#include "opal/util/argv.h"
#include "opal/util/output.h"
#include "ompi/mca/pml/pml.h"
#include "ompi/mca/btl/btl.h"

#include "opal/mca/base/mca_base_param.h"
#include "ompi/runtime/ompi_module_exchange.h"

#include "orte/mca/errmgr/errmgr.h"
#include "btl_elan.h"
#include "btl_elan_frag.h"
#include "btl_elan_endpoint.h" 

#include "ompi/mca/btl/base/base.h" 
#include "ompi/mca/btl/base/btl_base_error.h" 
#include "ompi/datatype/convertor.h" 

#include "elan/elan.h"

#include "opal/util/os_path.h"
#include "opal/util/opal_environ.h"
#include "ompi/communicator/communicator.h" 
mca_btl_elan_component_t mca_btl_elan_component = {
    {
        /* First, the mca_base_component_t struct containing meta information
           about the component itself */

        {
            /* Indicate that we are a pml v1.0.0 component (which also implies a
               specific MCA version) */
            MCA_BTL_BASE_VERSION_1_0_1,
            "elan", /* MCA component name */
            OMPI_MAJOR_VERSION,  /* MCA component major version */
            OMPI_MINOR_VERSION,  /* MCA component minor version */
            OMPI_RELEASE_VERSION,  /* MCA component release version */
            mca_btl_elan_component_open,  /* component open */
            mca_btl_elan_component_close  /* component close */
        },

        /* Next the MCA v1.0.0 component meta data */

        {
            /* The component is not checkpoint ready */
            MCA_BASE_METADATA_PARAM_NONE
        },
        mca_btl_elan_component_init,  
        mca_btl_elan_component_progress,
    }
};


/*
 * utility routines for parameter registration
 */

static inline int
mca_btl_elan_param_register_int( const char* param_name, 
                                 int default_value )
{
    int id = mca_base_param_register_int("btl","elan",param_name,NULL,default_value);
    int param_value = default_value;
    mca_base_param_lookup_int(id,&param_value);
    return param_value;
}

/*
 *  Called by MCA framework to open the component, registers
 *  component parameters.
 */

int mca_btl_elan_component_open(void)
{
    /* initialize state */
    mca_btl_elan_component.elan_num_btls = 0;
    mca_btl_elan_component.elan_btls = NULL;

    mca_btl_elan_module.super.btl_exclusivity = 0;
    mca_btl_elan_module.super.btl_eager_limit =  2*1024 - sizeof(mca_btl_elan_hdr_t);
    mca_btl_elan_module.super.btl_rndv_eager_limit = 32*1024 - sizeof(mca_btl_elan_hdr_t);
    mca_btl_elan_module.super.btl_max_send_size = 64*1024; /*64*1024;*/
    mca_btl_elan_module.super.btl_rdma_pipeline_send_length = 512 * 1024;
    mca_btl_elan_module.super.btl_rdma_pipeline_frag_size = 128 * 1024;
    mca_btl_elan_module.super.btl_min_rdma_pipeline_size = 128 * 1024;
    mca_btl_elan_module.super.btl_flags = /* MCA_BTL_FLAGS_SEND_INPLACE | MCA_BTL_FLAGS_GET |*/ MCA_BTL_FLAGS_PUT | MCA_BTL_FLAGS_SEND;
    /* mca_btl_elan_module.super.btl_flags = MCA_BTL_FLAGS_SEND_INPLACE|MCA_BTL_FLAGS_RDMA | MCA_BTL_FLAGS_SEND ;*/
    mca_btl_elan_module.super.btl_bandwidth = 1959;
    mca_btl_elan_module.super.btl_latency = 4;
    mca_btl_base_param_register(&mca_btl_elan_component.super.btl_version,
                                &mca_btl_elan_module.super);

    /* register Elan4 component parameters */
    mca_btl_elan_component.elan_free_list_num =
        mca_btl_elan_param_register_int ("free_list_num", 8);
    mca_btl_elan_component.elan_free_list_max =
        mca_btl_elan_param_register_int ("free_list_max", 128);
    mca_btl_elan_component.elan_free_list_inc =
        mca_btl_elan_param_register_int ("free_list_inc", 32);

    mca_base_param_reg_string( (mca_base_component_t*)&mca_btl_elan_component, "elanidmap",
                               "System-wide configuration file for the Quadrics network (elanidmap)",
                               false, false, "/etc/elanidmap", &mca_btl_elan_component.elanidmap_file );
    mca_base_param_reg_int( (mca_base_component_t*)&mca_btl_elan_component, "max_posted_recv",
                            "Number of received posted in advance. Increasing this number for"
                            " communication bound application can lead to visible improvement"
                            " in performances",
                            false, false, 128, &mca_btl_elan_component.elan_max_posted_recv );
 
    return OMPI_SUCCESS;
}

/*
 * component cleanup - sanity checking of queue lengths
 */

int mca_btl_elan_component_close(void)
{
    if( NULL != mca_btl_elan_component.elan_btls ) {
        free( mca_btl_elan_component.elan_btls );
        mca_btl_elan_component.elan_btls = NULL;
        mca_btl_elan_component.elan_num_btls = 0;

        /* release resources */        
        OBJ_DESTRUCT(&mca_btl_elan_component.elan_procs);
        OBJ_DESTRUCT(&mca_btl_elan_component.elan_frag_eager);
        OBJ_DESTRUCT(&mca_btl_elan_component.elan_frag_user);
        OBJ_DESTRUCT(&mca_btl_elan_component.elan_frag_max);
        OBJ_DESTRUCT(&mca_btl_elan_component.elan_lock);
    }
    return OMPI_SUCCESS;
}

/*
 *  Elan4 component initialization:
 *  (1) read interface list from kernel and compare against component parameters
 *      then create a BTL instance for selected interfaces
 *  (2) setup Elan4 listen socket for incoming connection attempts
 *  (3) register BTL parameters with the MCA
 */
mca_btl_base_module_t**
mca_btl_elan_component_init( int *num_btl_modules,
                             bool enable_progress_threads,
                             bool enable_mpi_threads )
{

    mca_btl_base_module_t** btls;
    size_t i , count, vpid;

    *num_btl_modules = 0;
    if (enable_progress_threads) { 
        ompi_modex_send(&mca_btl_elan_component.super.btl_version, NULL, 0);
        return NULL;
    }

    /* Retrieve the position of the node in the elan network */
    {
        FILE* position;
        char file_line[255];
        int my_elan_position;

        position = fopen("/proc/qsnet/elan3/device0/position","r");
        if( NULL == position ) {
            position = fopen("/proc/qsnet/elan4/device0/position","r");
            if( NULL == position ) {
                opal_output( 0, "Unable to retrieve the node position on the elan network" );
                return NULL;
            }
        }
        if( 0 == fscanf( position, "%s%i", file_line, &my_elan_position ) ) {
            opal_output( 0, "Unable to read the network position" );
            return NULL;
        }
        fclose(position);
        vpid = my_elan_position;
    }
   
    OBJ_CONSTRUCT (&mca_btl_elan_component.elan_lock, opal_mutex_t);
    OBJ_CONSTRUCT (&mca_btl_elan_component.elan_frag_eager, ompi_free_list_t);
    OBJ_CONSTRUCT (&mca_btl_elan_component.elan_frag_max, ompi_free_list_t);
    OBJ_CONSTRUCT (&mca_btl_elan_component.elan_frag_user, ompi_free_list_t);
    OBJ_CONSTRUCT(&mca_btl_elan_component.elan_procs, opal_list_t);
    ompi_free_list_init_new( &mca_btl_elan_component.elan_frag_eager,
                             sizeof(mca_btl_elan_frag_t) + mca_btl_elan_module.super.btl_eager_limit,
                             CACHE_LINE_SIZE,
                             OBJ_CLASS(mca_btl_elan_frag_t),
                             0,CACHE_LINE_SIZE,
                             mca_btl_elan_component.elan_free_list_num,
                             mca_btl_elan_component.elan_free_list_max,
                             mca_btl_elan_component.elan_free_list_inc,
                             NULL ); /* use default allocator */

    ompi_free_list_init_new( &mca_btl_elan_component.elan_frag_user,
                             sizeof(mca_btl_elan_frag_t),
                             CACHE_LINE_SIZE,
                             OBJ_CLASS(mca_btl_elan_frag_t),
                             0,CACHE_LINE_SIZE,
                             mca_btl_elan_component.elan_free_list_num,
                             mca_btl_elan_component.elan_free_list_max,
                             mca_btl_elan_component.elan_free_list_inc,
                             NULL ); /* use default allocator */

    ompi_free_list_init_new( &mca_btl_elan_component.elan_frag_max,
                             sizeof(mca_btl_elan_frag_t)+mca_btl_elan_module.super.btl_max_send_size,
                             CACHE_LINE_SIZE,
                             OBJ_CLASS(mca_btl_elan_frag_t),
                             0,CACHE_LINE_SIZE,
                             mca_btl_elan_component.elan_free_list_num,
                             mca_btl_elan_component.elan_free_list_max,
                             mca_btl_elan_component.elan_free_list_inc,
                             NULL ); /* use default allocator */
    
    ompi_modex_send( &mca_btl_elan_component.super.btl_version, &vpid,
                     sizeof(vpid));

    mca_btl_elan_component.elan_num_btls = 1;
    mca_btl_elan_component.elan_btls = malloc( mca_btl_elan_component.elan_num_btls *
                                               sizeof(mca_btl_base_module_t*) );
    for( i = count = 0; i < mca_btl_elan_component.elan_num_btls; i++ ) {
        mca_btl_elan_module_t* btl =  malloc (sizeof (mca_btl_elan_module_t));	
        if(NULL == btl)
            continue;
        memcpy( btl, &mca_btl_elan_module, sizeof(mca_btl_elan_module_t) );
        OBJ_CONSTRUCT( &btl->elan_lock, opal_mutex_t );
        OBJ_CONSTRUCT( &btl->send_list, opal_list_t );
        OBJ_CONSTRUCT( &btl->rdma_list, opal_list_t );

        mca_btl_elan_component.elan_btls[count++] = btl;
    }
    mca_btl_elan_component.elan_num_btls = count ;
    btls = (mca_btl_base_module_t**)malloc( mca_btl_elan_component.elan_num_btls *
                                            sizeof(mca_btl_base_module_t*) );
    if( NULL == btls ) {
        free( mca_btl_elan_component.elan_btls );
        mca_btl_elan_component.elan_num_btls = 0;  /* no active BTL modules */
        return NULL;
    }
    memcpy( btls,  mca_btl_elan_component.elan_btls,
            mca_btl_elan_component.elan_num_btls * sizeof(mca_btl_elan_module_t*) );
    *num_btl_modules = mca_btl_elan_component.elan_num_btls;
    return btls;
}

/*
 *  Elan4 component progress.
 */
int mca_btl_elan_component_progress( void )
{
    int num_progressed = 0, i;

    for( i = 0; i < (int)mca_btl_elan_component.elan_num_btls; i++ ) {
        mca_btl_elan_module_t* elan_btl = mca_btl_elan_component.elan_btls[i];

        if( elan_queueRxPoll( elan_btl->rx_queue, 0 ) ) {
            mca_btl_active_message_callback_t* reg;
            mca_btl_elan_hdr_t* elan_hdr = NULL;
            mca_btl_elan_frag_t frag;

            elan_hdr = (mca_btl_elan_hdr_t*)elan_queueRxWait( elan_btl->rx_queue, NULL, 0 );
            frag.base.des_dst = &frag.segment;
            frag.base.des_dst->seg_addr.pval = (void*)(elan_hdr+1);
            frag.base.des_dst->seg_len = (size_t)elan_hdr->length;
            frag.base.des_dst_cnt = 1;
            frag.tag = (mca_btl_base_tag_t)elan_hdr->tag;
            frag.size = elan_hdr->length;

            reg = mca_btl_base_active_message_trigger + frag.tag;
            reg->cbfunc( &(elan_btl->super), frag.tag, &(frag.base), reg->cbdata );

            elan_queueRxComplete( elan_btl->rx_queue );
            num_progressed++;
        }
        /* If there are any pending sends check their completion */
        if( !opal_list_is_empty( &(elan_btl->send_list) ) ) {
            mca_btl_elan_frag_t* frag = (mca_btl_elan_frag_t*)opal_list_get_first( &(elan_btl->send_list) );
            if( elan_poll(frag->elan_event, 1) ) {
                OPAL_THREAD_LOCK(&elan_btl->elan_lock);
                opal_list_remove_first( &(elan_btl->send_list) );
                OPAL_THREAD_UNLOCK(&elan_btl->elan_lock);
                num_progressed++;

                frag->base.des_cbfunc( &(elan_btl->super), frag->endpoint,
                                       &(frag->base), OMPI_SUCCESS );
            }
        }
        /* If any RDMA have been posted, check their status */
        if( !opal_list_is_empty( &(elan_btl->rdma_list) ) ) {
            mca_btl_elan_frag_t* frag = (mca_btl_elan_frag_t*)opal_list_get_first( &(elan_btl->rdma_list) );
            if( elan_poll(frag->elan_event, 1) ) {
                OPAL_THREAD_LOCK(&elan_btl->elan_lock);
                opal_list_remove_first( &(elan_btl->rdma_list) );
                OPAL_THREAD_UNLOCK(&elan_btl->elan_lock);
                num_progressed++;

                frag->base.des_cbfunc( &(elan_btl->super), frag->endpoint,
                                       &(frag->base), OMPI_SUCCESS );
            }
        }
    }

    return num_progressed;
}