openmpi/ompi/mca/btl/gm/btl_gm_component.c

/*
 * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2005 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, 
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2007-2008 Cisco Systems, Inc.  All rights reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */


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

#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif

#include "opal/mca/base/mca_base_param.h"
#include "ompi/mca/mpool/base/base.h" 
#include "ompi/mca/mpool/rdma/mpool_rdma.h"
#include "btl_gm.h"
#include "btl_gm_frag.h"
#include "btl_gm_endpoint.h" 
#include "ompi/mca/btl/base/base.h" 
#include "ompi/mca/btl/base/btl_base_error.h"
#include "btl_gm_endpoint.h"
#include "orte/runtime/orte_globals.h"
#include "orte/util/name_fns.h"
#include "ompi/runtime/ompi_module_exchange.h"
#include "ompi/runtime/mpiruntime.h"


#if OMPI_ENABLE_PROGRESS_THREADS
static void* mca_btl_gm_progress_thread( opal_object_t* arg );
#endif
static int gm_reg_mr(void *reg_data, void *base, size_t size,
        mca_mpool_base_registration_t *reg);
static int gm_dereg_mr(void *reg_data, mca_mpool_base_registration_t *reg);


mca_btl_gm_component_t mca_btl_gm_component = {
    {
        /* First, the mca_base_component_t struct containing meta information
           about the component itself */

        {
            MCA_BTL_BASE_VERSION_2_0_0,

            "gm", /* 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_gm_component_open,  /* component open */
            mca_btl_gm_component_close  /* component close */
        },
        {
            /* The component is not checkpoint ready */
            MCA_BASE_METADATA_PARAM_NONE
        },

        mca_btl_gm_component_init,  
        mca_btl_gm_component_progress,
    }
};


/*
 * utility routines for parameter registration
 */

static inline char* mca_btl_gm_param_register_string(
                                                     const char* param_name, 
                                                     const char* default_value)
{
    char *param_value;
    int id = mca_base_param_register_string("btl","gm",param_name,NULL,default_value);
    mca_base_param_lookup_string(id, &param_value);
    return param_value;
}

static inline int mca_btl_gm_param_register_int(
        const char* param_name, 
        int default_value)
{
    int id = mca_base_param_register_int("btl","gm",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_gm_component_open(void)
{  
    /* initialize state */
    mca_btl_gm_component.gm_num_btls=0;
    mca_btl_gm_component.gm_btls=NULL;
    
    /* initialize objects */ 
    OBJ_CONSTRUCT(&mca_btl_gm_component.gm_procs, opal_list_t);
    OBJ_CONSTRUCT(&mca_btl_gm_component.gm_lock, opal_mutex_t);

    /* register GM component parameters */
    mca_btl_gm_component.gm_free_list_num =
        mca_btl_gm_param_register_int ("free_list_num", 8);
    mca_btl_gm_component.gm_free_list_max =
        mca_btl_gm_param_register_int ("free_list_max", -1);
    mca_btl_gm_component.gm_free_list_inc =
        mca_btl_gm_param_register_int ("free_list_inc", 8);
    mca_btl_gm_component.gm_debug = 
        mca_btl_gm_param_register_int("debug", 0); 
    mca_btl_gm_component.gm_mpool_name = 
        mca_btl_gm_param_register_string("mpool", "rdma");
    mca_btl_gm_component.gm_max_ports = 
        mca_btl_gm_param_register_int("max_ports", 16); 
    mca_btl_gm_component.gm_max_boards = 
        mca_btl_gm_param_register_int("max_boards", 4); 
    mca_btl_gm_component.gm_max_btls = 
        mca_btl_gm_param_register_int("max_modules", 4); 
    mca_btl_gm_component.gm_num_high_priority = 
        mca_btl_gm_param_register_int("num_high_priority", 8); 
    mca_btl_gm_component.gm_num_repost = 
        mca_btl_gm_param_register_int("num_repost", 4); 
    mca_btl_gm_component.gm_port_name=
        mca_btl_gm_param_register_string("port_name", "OMPI"); 

    /* register gm module parameters */
    mca_btl_gm_module.super.btl_exclusivity = MCA_BTL_EXCLUSIVITY_DEFAULT;
    mca_btl_gm_module.super.btl_eager_limit = 32*1024;
    mca_btl_gm_module.super.btl_rndv_eager_limit = 32*1024;
    mca_btl_gm_module.super.btl_max_send_size = 64*1024;
    mca_btl_gm_module.super.btl_rdma_pipeline_send_length = 512*1024;
    mca_btl_gm_module.super.btl_rdma_pipeline_frag_size = 128*1024;
    mca_btl_gm_module.super.btl_min_rdma_pipeline_size = 128*1024;
#if OMPI_MCA_BTL_GM_HAVE_RDMA_PUT 
    mca_btl_gm_module.super.btl_flags  =  MCA_BTL_FLAGS_PUT |
        MCA_BTL_FLAGS_NEED_ACK | MCA_BTL_FLAGS_NEED_CSUM; 
#else
    mca_btl_gm_module.super.btl_flags = MCA_BTL_FLAGS_SEND;
#endif
    mca_btl_gm_module.super.btl_bandwidth = 250;
    mca_btl_gm_module.super.btl_latency = 0;
    mca_btl_base_param_register(&mca_btl_gm_component.super.btl_version,
            &mca_btl_gm_module.super);
    
    /* compute the eager frag size */
    mca_btl_gm_component.gm_eager_frag_size =
        gm_min_size_for_length(mca_btl_gm_module.super.btl_eager_limit) - 1;
    mca_btl_gm_module.super.btl_eager_limit = 
        gm_max_length_for_size(mca_btl_gm_component.gm_eager_frag_size) -
        sizeof(mca_btl_base_header_t);
 
    /* compute the max frag size */
    mca_btl_gm_component.gm_max_frag_size = 
        gm_min_size_for_length(mca_btl_gm_module.super.btl_max_send_size) - 1;
    mca_btl_gm_module.super.btl_max_send_size = 
        gm_max_length_for_size(mca_btl_gm_component.gm_max_frag_size) -
        sizeof(mca_btl_base_header_t);

    return OMPI_SUCCESS;
}


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

int mca_btl_gm_component_close(void)
{
    return OMPI_SUCCESS;
}

static int gm_reg_mr(void *reg_data, void *base, size_t size,
        mca_mpool_base_registration_t *reg)
{
    struct gm_port *port = (struct gm_port*)reg_data;
    int rc;

    rc = gm_register_memory(port, base, size);

    if(rc != GM_SUCCESS)
        return OMPI_ERR_OUT_OF_RESOURCE;

    return MPI_SUCCESS;
}

static int gm_dereg_mr(void *reg_data, mca_mpool_base_registration_t *reg)
{
    struct gm_port *port = (struct gm_port*)reg_data;
    int rc;

    rc = gm_deregister_memory(port, reg->base, reg->bound - reg->base + 1);

    if(rc != GM_SUCCESS) {
        opal_output(0, "%s: error unpinning gm memory errno says %s\n",
                 __func__, strerror(errno));
        return OMPI_ERROR;
    }

    return OMPI_SUCCESS;
}

/**
 * Initialize module instance
 */

static int
mca_btl_gm_module_init (mca_btl_gm_module_t * btl)
{
    mca_mpool_base_resources_t resources;
    int32_t num_high_priority;
    int32_t i;
    int rc;

    /* initialize objects */
    OBJ_CONSTRUCT(&btl->gm_frag_eager, ompi_free_list_t);
    OBJ_CONSTRUCT(&btl->gm_frag_max, ompi_free_list_t);
    OBJ_CONSTRUCT(&btl->gm_frag_user, ompi_free_list_t);
    OBJ_CONSTRUCT(&btl->gm_pending, opal_list_t);
    OBJ_CONSTRUCT(&btl->gm_repost, opal_list_t);
#if OMPI_ENABLE_PROGRESS_THREADS
    OBJ_CONSTRUCT(&btl->gm_thread, opal_thread_t);
#endif

    btl->error_cb = NULL;
    /* query nic tokens */
    btl->gm_num_send_tokens = gm_num_send_tokens (btl->port);
    btl->gm_max_send_tokens = btl->gm_num_send_tokens;
    btl->gm_num_recv_tokens = gm_num_receive_tokens (btl->port);
    btl->gm_max_recv_tokens = btl->gm_num_recv_tokens;

    /* dont allow high priority to exceed 1/2 of available recv tokens */
    num_high_priority = mca_btl_gm_component.gm_num_high_priority;
    if(num_high_priority > (btl->gm_num_recv_tokens >> 1)) {
        num_high_priority = btl->gm_num_recv_tokens >> 1;
    }
    if(mca_btl_gm_component.gm_num_repost > num_high_priority >> 1) {
        btl->gm_num_repost = (num_high_priority >> 1);
    } else {
        btl->gm_num_repost = mca_btl_gm_component.gm_num_repost;
    }
                                                                                                  
    /* initialize memory pool */
    resources.reg_data = (void*)btl->port;
    resources.sizeof_reg = sizeof(mca_mpool_base_registration_t);
    resources.register_mem = gm_reg_mr;
    resources.deregister_mem = gm_dereg_mr;
    btl->super.btl_mpool = mca_mpool_base_module_create(
        mca_btl_gm_component.gm_mpool_name,
        &btl->super,
        &resources);
    if(NULL == btl->super.btl_mpool) {
        opal_output (0, "[%s:%d] unable to initialize mpool", __FILE__, __LINE__);
        return OMPI_ERROR;
    }
 
    /* initialize free lists */
    ompi_free_list_init_new( &btl->gm_frag_eager,
            sizeof (mca_btl_gm_frag_eager_t),
            opal_cache_line_size,
            OBJ_CLASS (mca_btl_gm_frag_eager_t),
            (1 << mca_btl_gm_component.gm_eager_frag_size) + sizeof (uintptr_t),
            opal_cache_line_size, 
            btl->gm_max_send_tokens,  
            mca_btl_gm_component.gm_free_list_max, 
            mca_btl_gm_component.gm_free_list_inc,
            btl->super.btl_mpool ); 

    ompi_free_list_init_new( &btl->gm_frag_max,
            sizeof (mca_btl_gm_frag_max_t),
            opal_cache_line_size,
            OBJ_CLASS (mca_btl_gm_frag_max_t),
            (1 << mca_btl_gm_component.gm_max_frag_size) + sizeof (uintptr_t),
            opal_cache_line_size,
            btl->gm_max_recv_tokens,
            mca_btl_gm_component.gm_free_list_max, 
            mca_btl_gm_component.gm_free_list_inc,
            btl->super.btl_mpool ); 

    ompi_free_list_init_new( &btl->gm_frag_user,
            sizeof (mca_btl_gm_frag_user_t),
            opal_cache_line_size,
            OBJ_CLASS (mca_btl_gm_frag_user_t),
            0,opal_cache_line_size,
            mca_btl_gm_component.gm_free_list_num,  
            mca_btl_gm_component.gm_free_list_max, 
            mca_btl_gm_component.gm_free_list_inc,
            NULL );


    /* post receive buffers */
    for(i=0; i<num_high_priority; i++) {
        mca_btl_gm_frag_t* frag;
        MCA_BTL_GM_FRAG_ALLOC_EAGER(btl, frag, rc);
        if(NULL == frag) {
            return rc;
        }
        frag->type = MCA_BTL_GM_EAGER;
        frag->base.des_src = NULL;
        frag->base.des_src_cnt = 0;
        frag->base.des_dst = &frag->segment;
        frag->base.des_dst_cnt = 1;
        frag->priority = GM_HIGH_PRIORITY;
        gm_provide_receive_buffer(btl->port, frag->hdr, frag->size, frag->priority);
    }

    for(i=mca_btl_gm_component.gm_num_high_priority; i<btl->gm_max_recv_tokens; i++) {
        mca_btl_gm_frag_t* frag;
        MCA_BTL_GM_FRAG_ALLOC_MAX(btl, frag, rc);
        if(NULL == frag) {
            return rc;
        }
        frag->type = MCA_BTL_GM_SEND;
        frag->base.des_src = NULL;
        frag->base.des_src_cnt = 0;
        frag->base.des_dst = &frag->segment;
        frag->base.des_dst_cnt = 1;
        frag->priority = GM_LOW_PRIORITY;
        gm_provide_receive_buffer(btl->port, frag->hdr, frag->size, frag->priority);
    }

    /* enable rdma */
    if( GM_SUCCESS != gm_allow_remote_memory_access (btl->port) ) {
        opal_output (0, "[%s:%d] unable to allow remote memory access", __FILE__, __LINE__);
        return OMPI_ERROR;
    }

#if OMPI_ENABLE_PROGRESS_THREADS
    /* start progress thread */
    btl->gm_progress = true;
    btl->gm_thread.t_run = mca_btl_gm_progress_thread;
    btl->gm_thread.t_arg = btl;
    if(OPAL_SUCCESS != (rc = opal_thread_start(&btl->gm_thread))) {
        opal_output (0, "[%s:%d] unable to create progress thread, retval=%d", __FILE__, __LINE__, rc);
        return rc;
    }
#endif
    return OMPI_SUCCESS;
}


/* 
 * Scan all ports on the boards. As it's difficult to find the total number of boards
 * so we use a predefined maximum.  
 */
static int mca_btl_gm_discover( void )
{
    uint32_t board_no;
    uint32_t  port_no;
    uint32_t node_id;
    struct gm_port* port;
#if GM_API_VERSION > 0x200
    uint32_t global_id;
#else
    char  global_id[GM_MAX_HOST_NAME_LEN];
#endif  /* GM_API_VERSION > 0x200 */
    int rc;
    
    for( board_no = 0; board_no < mca_btl_gm_component.gm_max_boards; board_no++ ) {
        mca_btl_gm_module_t *btl;

        /* open the first available gm port for this board  */
        for( port_no = 4; port_no < mca_btl_gm_component.gm_max_ports; port_no++ ) {
            if (3 == port_no) {
                continue;  /* port 0,1,3 reserved  */
            } else if (GM_SUCCESS == gm_open(&port, board_no, port_no,
                mca_btl_gm_component.gm_port_name, GM_API_VERSION) ) {
                break;
            }
        }
        if( port_no == mca_btl_gm_component.gm_max_ports ) {
            continue;
        }

        /*  Get node local Id */
        if( GM_SUCCESS != gm_get_node_id( port, &node_id) ) {
            opal_output (0, " failure to get node_id \n");
            continue;
        }
        /* Gather an unique id for the node */
#if GM_API_VERSION > 0x200
        if (GM_SUCCESS != gm_node_id_to_global_id( port, node_id, &global_id) ) {
            opal_output (0, "[%s:%d] Unable to get my GM global unique id", __FILE__, __LINE__);
            continue;
        }
#else
        if( GM_SUCCESS != gm_get_host_name( port, global_id ) ) {
            opal_output( 0, "[%s:%d] Unable to get the GM host name\n", __FILE__, __LINE__);
            continue;
        }
#endif  /* GM_API_VERSION > 0x200 */

        /* create the btl module */
        btl = (mca_btl_gm_module_t *)malloc( sizeof(mca_btl_gm_module_t) );
        if (NULL == btl) {
            opal_output( 0, "[%s:%d] out of resources", __FILE__, __LINE__);
            return OMPI_ERR_OUT_OF_RESOURCE;
        }
        /* copy the basic informations into the new BTL */
        memcpy (btl, &mca_btl_gm_module, sizeof(mca_btl_gm_module_t));

        /* setup local address */
        btl->port = port;
        btl->gm_addr.port_id  = port_no;
        btl->gm_addr.node_id = node_id;
#if GM_API_VERSION > 0x200
        btl->gm_addr.global_id = global_id;
#else
        strncpy( btl->gm_addr.global_id, global_id, GM_MAX_HOST_NAME_LEN );
#endif  /* GM_API_VERSION > 0x200 */

        if(mca_btl_gm_component.gm_debug > 0) {
            opal_output(0,
                        "%s gm_port %08lX, "
                        "board %" PRIu32 ", global %" PRIu32 " "
                        "node %" PRIu32 "port %" PRIu32 "\n", 
                        ORTE_NAME_PRINT(ORTE_PROC_MY_NAME), 
                        (unsigned long) port, board_no, global_id, node_id, port_no);
        }

        if((rc = mca_btl_gm_module_init(btl)) != OMPI_SUCCESS) {
            opal_output(0, "[%s:%d] unable to initialze gm port", __FILE__, __LINE__);
            return rc;
        }

        /* everything is OK let's mark it as usable and go to the next one */
        mca_btl_gm_component.gm_btls[mca_btl_gm_component.gm_num_btls] = btl;
        if(++mca_btl_gm_component.gm_num_btls >= mca_btl_gm_component.gm_max_btls ) {
            break;
        }
    }
    return OMPI_SUCCESS;
}

/*
 *  Register GM component addressing information. The MCA framework
 *  will make this available to all peers.
 */

static int
mca_btl_gm_modex_send(void)
{
    int         rc;
    size_t      i;
    size_t      size;
    mca_btl_gm_addr_t *addrs = NULL;

    size = mca_btl_gm_component.gm_num_btls * sizeof (mca_btl_gm_addr_t);
    if (0 != size) {
        addrs = (mca_btl_gm_addr_t *)malloc (size);
        if (NULL == addrs) {
            return OMPI_ERR_OUT_OF_RESOURCE;
        }

        for (i = 0; i < mca_btl_gm_component.gm_num_btls; i++) {
            mca_btl_gm_module_t *btl = mca_btl_gm_component.gm_btls[i];
            addrs[i] = btl->gm_addr;
            MCA_BTL_GM_ADDR_HTON(addrs[i]);
        }
    }
    rc = ompi_modex_send (&mca_btl_gm_component.super.btl_version, addrs, size);
    if (NULL != addrs) {
        free (addrs);
    }
    return rc;
}
                                                                                                                

/*
 * Initialize the GM component,
 * check how many boards are available and open ports on them.
 */
                                                                                                                
mca_btl_base_module_t **
mca_btl_gm_component_init (int *num_btl_modules,
                           bool enable_progress_threads,
                           bool enable_mpi_threads)
{
    mca_btl_base_module_t **btls;
    *num_btl_modules = 0;

    OPAL_THREAD_LOCK(&mca_btl_gm_component.gm_lock);

    /* Currently refuse to run if MPI_THREAD_MULTIPLE is enabled */
    if (ompi_mpi_thread_multiple && !mca_btl_base_thread_multiple_override) {
        mca_btl_gm_component.gm_num_btls = 0;
        mca_btl_gm_modex_send();
        OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
        return NULL;
    }

    /* try to initialize GM */
    if( GM_SUCCESS != gm_init() ) {
        opal_output( 0, "[%s:%d] error in initializing the gm library\n", __FILE__, __LINE__ );
        mca_btl_gm_component.gm_num_btls = 0;
        mca_btl_gm_modex_send();
        OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
        return NULL;
    }

    /* First discover all available boards. For each board we create a unique BTL */
    mca_btl_gm_component.gm_btls = malloc( mca_btl_gm_component.gm_max_btls * sizeof (mca_btl_gm_module_t *));
    if (NULL == mca_btl_gm_component.gm_btls) {
        opal_output( 0, "[%s:%d] out of resources.", __FILE__, __LINE__ );
        OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
        return NULL;
    }

    /* initialize gm */
    if (OMPI_SUCCESS != mca_btl_gm_discover()) {
        mca_btl_base_error_no_nics("Myrinet/GM", "NIC");
        mca_btl_gm_component.gm_num_btls = 0;
        mca_btl_gm_modex_send();
        OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
        return NULL;
    }
    if (mca_btl_gm_component.gm_num_btls == 0) {
        mca_btl_base_error_no_nics("Myrinet/GM", "NIC");
        mca_btl_gm_component.gm_num_btls = 0;
        mca_btl_gm_modex_send();
        OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
        return NULL;
    }

    /* publish GM parameters with the MCA framework */
    if (OMPI_SUCCESS != mca_btl_gm_modex_send()) {
        OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
        return NULL;
    }

    /* return array of BTLs */
    btls = (mca_btl_base_module_t**) malloc (
                mca_btl_gm_component.gm_num_btls * sizeof(mca_btl_base_module_t *));
    if (NULL == btls) {
        OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
        return NULL;
    }

    memcpy(btls, mca_btl_gm_component.gm_btls,
           mca_btl_gm_component.gm_num_btls * sizeof(mca_btl_gm_module_t *));
    *num_btl_modules = mca_btl_gm_component.gm_num_btls;
    OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
    return btls;
}
                                                                                                                

/*
 *  GM component progress.
 */


int mca_btl_gm_component_progress()
{
    static int32_t inprogress = 0;
    int count = 0;
    size_t i;
    
    /* could get into deadlock in this case as we post recvs after callback completes */
    if(OPAL_THREAD_ADD32(&inprogress, 1) > 1) {
        OPAL_THREAD_ADD32(&inprogress, -1);
        return OMPI_SUCCESS;
    }

    OPAL_THREAD_LOCK(&mca_btl_gm_component.gm_lock);
    for( i = 0; i < mca_btl_gm_component.gm_num_btls; ) {
        mca_btl_gm_module_t* btl = mca_btl_gm_component.gm_btls[i];
        gm_recv_event_t* event = gm_receive(btl->port);

        /* If there are no receive events just skip the function call */
        switch(gm_ntohc(event->recv.type)) {
            case GM_FAST_RECV_EVENT:
            case GM_FAST_PEER_RECV_EVENT:
            case GM_FAST_HIGH_RECV_EVENT:
            case GM_FAST_HIGH_PEER_RECV_EVENT:
                {
                unsigned char* buffer = (unsigned char*)gm_ntohp(event->recv.buffer);
                mca_btl_gm_frag_t* frag = (mca_btl_gm_frag_t*)*((uintptr_t*)(buffer - sizeof(uintptr_t)));
                mca_btl_base_header_t* hdr = (mca_btl_base_header_t *)gm_ntohp(event->recv.message);
                mca_btl_active_message_callback_t* reg;
                frag->segment.seg_addr.pval = (hdr+1);
                frag->segment.seg_len = gm_ntohl(event->recv.length) - sizeof(mca_btl_base_header_t);
                reg = mca_btl_base_active_message_trigger + hdr->tag;

                /* cbfunc may be null if interface goes down.. */
                if(reg->cbfunc) { 
                    OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
                    reg->cbfunc(&btl->super, hdr->tag, &frag->base, reg->cbdata);
                    OPAL_THREAD_LOCK(&mca_btl_gm_component.gm_lock);
                } else { 
                    btl->error_cb(&btl->super, MCA_BTL_ERROR_FLAGS_FATAL);
                    return 0;
                }
                MCA_BTL_GM_FRAG_POST(btl,frag);
                count++;
                break;
                }
            case GM_RECV_EVENT:
            case GM_PEER_RECV_EVENT:
            case GM_HIGH_RECV_EVENT:
            case GM_HIGH_PEER_RECV_EVENT:
                {
                unsigned char* buffer = (unsigned char*)gm_ntohp(event->recv.buffer);
                mca_btl_gm_frag_t* frag = (mca_btl_gm_frag_t*)*((uintptr_t*)(buffer - sizeof(uintptr_t)));
                mca_btl_base_header_t* hdr = (mca_btl_base_header_t*)buffer;
                mca_btl_active_message_callback_t* reg;
                frag->segment.seg_addr.pval = (hdr+1);
                frag->segment.seg_len = gm_ntohl(event->recv.length) - sizeof(mca_btl_base_header_t);
                reg = mca_btl_base_active_message_trigger + hdr->tag;
                if(reg->cbfunc) { 
                    OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
                    reg->cbfunc(&btl->super, hdr->tag, &frag->base, reg->cbdata);
                    OPAL_THREAD_LOCK(&mca_btl_gm_component.gm_lock);
                    
                    MCA_BTL_GM_FRAG_POST(btl,frag);
                } else { 
                    btl->error_cb(&btl->super, MCA_BTL_ERROR_FLAGS_FATAL);
                    return 0;
                }
                count++;
                break;
                }
            case GM_NO_RECV_EVENT:
                i++;
                break;
            default:
                gm_unknown(btl->port, event);
                break;
        }
    }
    OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
    OPAL_THREAD_ADD32(&inprogress, -1);
    return count;
}


#if OMPI_ENABLE_PROGRESS_THREADS
static void* mca_btl_gm_progress_thread( opal_object_t* arg )
{
    opal_thread_t* thread = (opal_thread_t*)arg;
    mca_btl_gm_module_t* btl = thread->t_arg;

    /* This thread enter in a cancel enabled state */
    pthread_setcancelstate( PTHREAD_CANCEL_ENABLE, NULL );
    pthread_setcanceltype( PTHREAD_CANCEL_ASYNCHRONOUS, NULL );

    OPAL_THREAD_LOCK(&mca_btl_gm_component.gm_lock);
    while(btl->gm_progress) {
        gm_recv_event_t* event;

        /* dont process events while the app is in the library */
        while(ompi_progress_threads()) {
            OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
            while(ompi_progress_threads())
               sched_yield();
            usleep(100); /* give app a chance to re-enter library */
            OPAL_THREAD_LOCK(&mca_btl_gm_component.gm_lock);
        }

        /* otherwise processes any pending events */
        event = gm_blocking_receive_no_spin(btl->port);
        switch(gm_ntohc(event->recv.type)) {
            case GM_FAST_RECV_EVENT:
            case GM_FAST_PEER_RECV_EVENT:
            case GM_FAST_HIGH_RECV_EVENT:
            case GM_FAST_HIGH_PEER_RECV_EVENT:
                {
                unsigned char* buffer = (unsigned char*)gm_ntohp(event->recv.buffer);
                mca_btl_gm_frag_t* frag = (mca_btl_gm_frag_t*)*((uintptr_t*)(buffer - sizeof(uintptr_t)));
                mca_btl_base_header_t* hdr = (mca_btl_base_header_t *)gm_ntohp(event->recv.message);
                mca_btl_active_message_callback_t* reg;
                frag->segment.seg_addr.pval = (hdr+1);
                frag->segment.seg_len = gm_ntohl(event->recv.length) - sizeof(mca_btl_base_header_t);
                reg = mca_btl_base_active_message_trigger + hdr->tag;

                OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
                reg->cbfunc(&btl->super, hdr->tag, &frag->base, reg->cbdata);
                OPAL_THREAD_LOCK(&mca_btl_gm_component.gm_lock);

                MCA_BTL_GM_FRAG_POST(btl,frag);
                break;
                }
            case GM_RECV_EVENT:
            case GM_PEER_RECV_EVENT:
            case GM_HIGH_RECV_EVENT:
            case GM_HIGH_PEER_RECV_EVENT:
                {
                unsigned char* buffer = (unsigned char*)gm_ntohp(event->recv.buffer);
                mca_btl_gm_frag_t* frag = (mca_btl_gm_frag_t*)*((uintptr_t*)(buffer - sizeof(uintptr_t)));
                mca_btl_base_header_t* hdr = (mca_btl_base_header_t*)buffer;
                mca_btl_active_message_callback_t* reg;
                frag->segment.seg_addr.pval = (hdr+1);
                frag->segment.seg_len = gm_ntohl(event->recv.length) - sizeof(mca_btl_base_header_t);
                reg = mca_btl_base_active_message_trigger + hdr->tag;

                OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
                reg->cbfunc(&btl->super, hdr->tag, &frag->base, reg->cbdata);
                OPAL_THREAD_LOCK(&mca_btl_gm_component.gm_lock);

                MCA_BTL_GM_FRAG_POST(btl,frag);
                break;
                }
            case _GM_SLEEP_EVENT:
                OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
                gm_unknown(btl->port, event);
                OPAL_THREAD_LOCK(&mca_btl_gm_component.gm_lock);
                break;
            default:
                gm_unknown(btl->port, event);
                break;
        }
    }
    OPAL_THREAD_UNLOCK(&mca_btl_gm_component.gm_lock);
    return PTHREAD_CANCELED;
}
#endif