openmpi/ompi/mca/osc/pt2pt/osc_pt2pt_component.c

/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University.
 *                         All rights reserved.
 * Copyright (c) 2004-2006 The Trustees of the University of Tennessee.
 *                         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.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */

#include "ompi_config.h"

#include <string.h>

#include "osc_pt2pt.h"
#include "osc_pt2pt_sendreq.h"
#include "osc_pt2pt_replyreq.h"
#include "osc_pt2pt_header.h"
#include "osc_pt2pt_obj_convert.h"
#include "osc_pt2pt_data_move.h"
#include "osc_pt2pt_buffer.h"

#include "opal/threads/mutex.h"
#include "ompi/info/info.h"
#include "ompi/communicator/communicator.h"
#include "ompi/mca/osc/osc.h"
#include "ompi/mca/osc/base/base.h"
#include "ompi/mca/pml/pml.h"
#include "ompi/datatype/dt_arch.h"

static int ompi_osc_pt2pt_component_open(void);
static void ompi_osc_pt2pt_component_fragment_cb(struct ompi_osc_pt2pt_buffer_t *buffer);

ompi_osc_pt2pt_component_t mca_osc_pt2pt_component = {
    { /* ompi_osc_base_component_t */
        { /* ompi_base_component_t */
            OMPI_OSC_BASE_VERSION_1_0_0,
            "pt2pt",
            OMPI_MAJOR_VERSION,  /* MCA component major version */
            OMPI_MINOR_VERSION,  /* MCA component minor version */
            OMPI_RELEASE_VERSION,  /* MCA component release version */
            ompi_osc_pt2pt_component_open,
            NULL
        },
        { /* mca_base_component_data */
            false /* checkpointable? */
        },
        ompi_osc_pt2pt_component_init,
        ompi_osc_pt2pt_component_query,
        ompi_osc_pt2pt_component_select,
        ompi_osc_pt2pt_component_finalize
    }
};


ompi_osc_pt2pt_module_t ompi_osc_pt2pt_module_template = {
    {
        ompi_osc_pt2pt_module_free,

        ompi_osc_pt2pt_module_put,
        ompi_osc_pt2pt_module_get,
        ompi_osc_pt2pt_module_accumulate,

        ompi_osc_pt2pt_module_fence,

        ompi_osc_pt2pt_module_start,
        ompi_osc_pt2pt_module_complete,
        ompi_osc_pt2pt_module_post,
        ompi_osc_pt2pt_module_wait,
        ompi_osc_pt2pt_module_test,

        ompi_osc_pt2pt_module_lock,
        ompi_osc_pt2pt_module_unlock,
    }
};

/* look up parameters for configuring this window.  The code first
   looks in the info structure passed by the user, then through mca
   parameters. */
static bool
check_config_value_bool(char *key, ompi_info_t *info)
{
    char *value_string;
    int value_len, ret, flag, param;
    bool result;

    ret = ompi_info_get_valuelen(info, key, &value_len, &flag);
    if (OMPI_SUCCESS != ret) goto info_not_found;
    if (flag == 0) goto info_not_found;
    value_len++;

    value_string = (char*)malloc(sizeof(char) * value_len);
    if (NULL == value_string) goto info_not_found;

    ret = ompi_info_get(info, key, value_len, value_string, &flag);
    if (OMPI_SUCCESS != ret) {
        free(value_string);
        goto info_not_found;
    }
    assert(flag != 0);
    ret = ompi_info_value_to_bool(value_string, &result);
    free(value_string);
    if (OMPI_SUCCESS != ret) goto info_not_found;
    return result;

 info_not_found:
    param = mca_base_param_find("osc", "pt2pt", key);
    if (param == OPAL_ERROR) return false;

    ret = mca_base_param_lookup_int(param, &flag);
    if (OMPI_SUCCESS != ret) return false;

    return OPAL_INT_TO_BOOL(flag);
}


static int
ompi_osc_pt2pt_component_open(void)
{
    int tmp;

    mca_base_param_reg_int(&mca_osc_pt2pt_component.super.osc_version,
                           "no_locks",
                           "Enable optimizations available only if MPI_LOCK is not used.",
                           false, false, 0, NULL);

    mca_base_param_reg_int(&mca_osc_pt2pt_component.super.osc_version,
                           "eager_limit",
                           "Max size of eagerly sent data",
                           false, false, 16 * 1024, 
                           &tmp);

    mca_osc_pt2pt_component.p2p_c_eager_size = tmp;

    return OMPI_SUCCESS;
}


int
ompi_osc_pt2pt_component_init(bool enable_progress_threads,
                             bool enable_mpi_threads)
{
    /* we can run with either threads or not threads (may not be able
       to do win locks)... */
    mca_osc_pt2pt_component.p2p_c_have_progress_threads = 
        enable_progress_threads;

    OBJ_CONSTRUCT(&mca_osc_pt2pt_component.p2p_c_lock, opal_mutex_t);

    OBJ_CONSTRUCT(&mca_osc_pt2pt_component.p2p_c_modules,
                  opal_hash_table_t);
    opal_hash_table_init(&mca_osc_pt2pt_component.p2p_c_modules, 2);

    OBJ_CONSTRUCT(&mca_osc_pt2pt_component.p2p_c_sendreqs, opal_free_list_t);
    opal_free_list_init(&mca_osc_pt2pt_component.p2p_c_sendreqs,
                        sizeof(ompi_osc_pt2pt_sendreq_t),
                        OBJ_CLASS(ompi_osc_pt2pt_sendreq_t),
                        1, -1, 1);

    OBJ_CONSTRUCT(&mca_osc_pt2pt_component.p2p_c_replyreqs, opal_free_list_t);
    opal_free_list_init(&mca_osc_pt2pt_component.p2p_c_replyreqs,
                        sizeof(ompi_osc_pt2pt_replyreq_t),
                        OBJ_CLASS(ompi_osc_pt2pt_replyreq_t),
                        1, -1, 1);

    OBJ_CONSTRUCT(&mca_osc_pt2pt_component.p2p_c_longreqs, opal_free_list_t);
    opal_free_list_init(&mca_osc_pt2pt_component.p2p_c_longreqs,
                        sizeof(ompi_osc_pt2pt_longreq_t),
                        OBJ_CLASS(ompi_osc_pt2pt_longreq_t),
                        1, -1, 1);

    OBJ_CONSTRUCT(&mca_osc_pt2pt_component.p2p_c_buffers, opal_free_list_t);
    opal_free_list_init(&mca_osc_pt2pt_component.p2p_c_buffers,
                        mca_osc_pt2pt_component.p2p_c_eager_size +
                        sizeof(ompi_osc_pt2pt_buffer_t),
                        OBJ_CLASS(ompi_osc_pt2pt_buffer_t),
                        1, -1, 1);

    return OMPI_SUCCESS;
}


int 
ompi_osc_pt2pt_component_finalize(void)
{
    size_t num_modules;

    if (0 !=
        (num_modules = opal_hash_table_get_size(&mca_osc_pt2pt_component.p2p_c_modules))) {
        opal_output(ompi_osc_base_output,
                    "WARNING: There were %d Windows created but not freed.",
                    num_modules);
        opal_progress_unregister(ompi_osc_pt2pt_progress);
    }

    OBJ_DESTRUCT(&mca_osc_pt2pt_component.p2p_c_buffers);
    OBJ_DESTRUCT(&mca_osc_pt2pt_component.p2p_c_longreqs);
    OBJ_DESTRUCT(&mca_osc_pt2pt_component.p2p_c_replyreqs);
    OBJ_DESTRUCT(&mca_osc_pt2pt_component.p2p_c_sendreqs);
    OBJ_DESTRUCT(&mca_osc_pt2pt_component.p2p_c_modules);
    OBJ_DESTRUCT(&mca_osc_pt2pt_component.p2p_c_lock);

    return OMPI_SUCCESS;
}


int
ompi_osc_pt2pt_component_query(ompi_win_t *win,
                              ompi_info_t *info,
                              ompi_communicator_t *comm)
{
    /* we can always run - return a low priority */
    return 5;
}


int 
ompi_osc_pt2pt_component_select(ompi_win_t *win,
                               ompi_info_t *info,
                               ompi_communicator_t *comm)
{
    ompi_osc_pt2pt_module_t *module;
    int ret, i;
    ompi_osc_pt2pt_buffer_t *buffer;
    opal_free_list_item_t *item;

    /* create module structure */
    module = (ompi_osc_pt2pt_module_t*)malloc(sizeof(ompi_osc_pt2pt_module_t));
    if (NULL == module) return OMPI_ERROR;

    /* fill in the function pointer part */
    memcpy(module, &ompi_osc_pt2pt_module_template, 
           sizeof(ompi_osc_base_module_t));

    /* initialize the p2p part */
    OBJ_CONSTRUCT(&(module->p2p_lock), opal_mutex_t);
    OBJ_CONSTRUCT(&(module->p2p_acc_lock), opal_mutex_t);

    module->p2p_win = win;

    ret = ompi_comm_dup(comm, &(module->p2p_comm));
    if (ret != OMPI_SUCCESS) {
        OBJ_DESTRUCT(&(module->p2p_acc_lock));
        OBJ_DESTRUCT(&(module->p2p_lock));
        free(module);
        return ret;
    }

    module->p2p_cb_request = NULL;

    OBJ_CONSTRUCT(&module->p2p_pending_control_sends, opal_list_t);

    OBJ_CONSTRUCT(&module->p2p_pending_sendreqs, opal_list_t);
    module->p2p_num_pending_sendreqs = (unsigned int*)malloc(sizeof(unsigned int) * 
                                                      ompi_comm_size(module->p2p_comm));
    if (NULL == module->p2p_num_pending_sendreqs) {
        OBJ_DESTRUCT(&module->p2p_pending_sendreqs);
        ompi_comm_free(&comm);
        OBJ_DESTRUCT(&(module->p2p_acc_lock));
        OBJ_DESTRUCT(&(module->p2p_lock));
        free(module);
        return ret;
    }
    memset(module->p2p_num_pending_sendreqs, 0, 
           sizeof(unsigned int) * ompi_comm_size(module->p2p_comm));

    module->p2p_num_pending_out = 0;
    module->p2p_num_pending_in = 0;
    module->p2p_num_post_msgs = 0;
    module->p2p_num_complete_msgs = 0;
    module->p2p_tag_counter = 0;

    OBJ_CONSTRUCT(&(module->p2p_long_msgs), opal_list_t);

    OBJ_CONSTRUCT(&(module->p2p_copy_pending_sendreqs), opal_list_t);
    module->p2p_copy_num_pending_sendreqs = (unsigned int*)malloc(sizeof(unsigned int) * 
                                                           ompi_comm_size(module->p2p_comm));
    if (NULL == module->p2p_copy_num_pending_sendreqs) {
        OBJ_DESTRUCT(&module->p2p_copy_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_long_msgs);
        free(module->p2p_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_pending_sendreqs);
        ompi_comm_free(&comm);
        OBJ_DESTRUCT(&(module->p2p_acc_lock));
        OBJ_DESTRUCT(&(module->p2p_lock));
        free(module);
        return ret;
    }
    memset(module->p2p_num_pending_sendreqs, 0, 
           sizeof(unsigned int) * ompi_comm_size(module->p2p_comm));

    /* fence data */
    module->p2p_fence_coll_counts = (int*)malloc(sizeof(int) * 
                                                 ompi_comm_size(module->p2p_comm));
    if (NULL == module->p2p_fence_coll_counts) {
        free(module->p2p_copy_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_copy_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_long_msgs);
        free(module->p2p_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_pending_sendreqs);
        ompi_comm_free(&comm);
        OBJ_DESTRUCT(&(module->p2p_acc_lock));
        OBJ_DESTRUCT(&(module->p2p_lock));
        free(module);
        return ret;
    }
    for (i = 0 ; i < ompi_comm_size(module->p2p_comm) ; ++i) {
        module->p2p_fence_coll_counts[i] = 1;
    }

    module->p2p_fence_coll_results = (unsigned int*)malloc(sizeof(unsigned short) * 
                                                    ompi_comm_size(module->p2p_comm));
    if (NULL == module->p2p_fence_coll_results) {
        free(module->p2p_fence_coll_counts);
        free(module->p2p_copy_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_copy_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_long_msgs);
        free(module->p2p_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_pending_sendreqs);
        ompi_comm_free(&comm);
        OBJ_DESTRUCT(&(module->p2p_acc_lock));
        OBJ_DESTRUCT(&(module->p2p_lock));
        free(module);
        return ret;
    }

    /* pwsc data */
    module->p2p_pw_group = NULL;
    module->p2p_sc_group = NULL;
    module->p2p_sc_remote_active_ranks =
        (bool*)malloc(sizeof(bool) * ompi_comm_size(module->p2p_comm));
    if (NULL == module->p2p_sc_remote_active_ranks) {
        free(module->p2p_fence_coll_results);
        free(module->p2p_fence_coll_counts);
        free(module->p2p_copy_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_copy_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_long_msgs);
        free(module->p2p_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_pending_sendreqs);
        ompi_comm_free(&comm);
        OBJ_DESTRUCT(&(module->p2p_acc_lock));
        OBJ_DESTRUCT(&(module->p2p_lock));
        free(module);
        return OMPI_ERROR;
    }
    module->p2p_sc_remote_ranks =
        (int*)malloc(sizeof(int) * ompi_comm_size(module->p2p_comm));
    if (NULL == module->p2p_sc_remote_ranks) {
        free(module->p2p_sc_remote_active_ranks);
        free(module->p2p_fence_coll_results);
        free(module->p2p_fence_coll_counts);
        free(module->p2p_copy_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_copy_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_long_msgs);
        free(module->p2p_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_pending_sendreqs);
        ompi_comm_free(&comm);
        OBJ_DESTRUCT(&(module->p2p_acc_lock));
        OBJ_DESTRUCT(&(module->p2p_lock));
        free(module);
        return OMPI_ERROR;
    }

    /* lock data */
    module->p2p_lock_status = 0;
    module->p2p_shared_count = 0;
    OBJ_CONSTRUCT(&(module->p2p_locks_pending), opal_list_t);
    module->p2p_lock_received_ack = 0;

    /* update component data */
    OPAL_THREAD_LOCK(&mca_osc_pt2pt_component.p2p_c_lock);
    opal_hash_table_set_value_uint32(&mca_osc_pt2pt_component.p2p_c_modules,
                                     module->p2p_comm->c_contextid,
                                     module);

    if (1 == opal_hash_table_get_size(&mca_osc_pt2pt_component.p2p_c_modules)) {
        /* start progress thread */
        opal_progress_register(ompi_osc_pt2pt_progress);
    }
    OPAL_THREAD_UNLOCK(&mca_osc_pt2pt_component.p2p_c_lock);

    /* fill in window information */
    win->w_osc_module = (ompi_osc_base_module_t*) module;
    if (check_config_value_bool("no_locks", info)) {
        win->w_flags |= OMPI_WIN_NO_LOCKS;
    }

    /* sync memory - make sure all initialization completed */
    opal_atomic_mb();

    /* start up receive for protocol headers */
    OPAL_FREE_LIST_GET(&mca_osc_pt2pt_component.p2p_c_buffers,
                       item, ret);
    if (NULL == item) {
        free(module->p2p_sc_remote_ranks);
        free(module->p2p_sc_remote_active_ranks);
        free(module->p2p_fence_coll_results);
        free(module->p2p_fence_coll_counts);
        free(module->p2p_copy_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_copy_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_long_msgs);
        free(module->p2p_num_pending_sendreqs);
        OBJ_DESTRUCT(&module->p2p_pending_sendreqs);
        ompi_comm_free(&comm);
        OBJ_DESTRUCT(&(module->p2p_acc_lock));
        OBJ_DESTRUCT(&(module->p2p_lock));
        free(module);
        return OMPI_ERROR;
    }
    buffer = (ompi_osc_pt2pt_buffer_t*) item;
    buffer->cbfunc = ompi_osc_pt2pt_component_fragment_cb;
    buffer->cbdata = (void*) module;
    
    ret = MCA_PML_CALL(irecv(buffer->payload,
                             mca_osc_pt2pt_component.p2p_c_eager_size,
                             MPI_BYTE,
                             MPI_ANY_SOURCE,
                             CONTROL_MSG_TAG,
                             module->p2p_comm,
                             &buffer->request));
    opal_list_append(&module->p2p_pending_control_sends, 
                     &buffer->super.super);

    return ret;
}


/* dispatch for callback on message completion */
static void
ompi_osc_pt2pt_component_fragment_cb(struct ompi_osc_pt2pt_buffer_t *pt2pt_buffer)
{
    int ret;
    void *payload, *buffer;
    size_t buffer_len;
    ompi_osc_pt2pt_module_t *module;
    ompi_osc_pt2pt_buffer_t *new_pt2pt_buffer;
    opal_free_list_item_t *item;

    buffer = pt2pt_buffer->payload;
    buffer_len = pt2pt_buffer->status._count;
    module = pt2pt_buffer->cbdata;

    /* post a new receive message */

    /* start up receive for protocol headers */
    OPAL_FREE_LIST_GET(&mca_osc_pt2pt_component.p2p_c_buffers,
                       item, ret);
    assert(NULL != item);
    new_pt2pt_buffer = (ompi_osc_pt2pt_buffer_t*) item;
    new_pt2pt_buffer->cbfunc = ompi_osc_pt2pt_component_fragment_cb;
    new_pt2pt_buffer->cbdata = (void*) module;
    
    ret = MCA_PML_CALL(irecv(new_pt2pt_buffer->payload,
                             mca_osc_pt2pt_component.p2p_c_eager_size,
                             MPI_BYTE,
                             MPI_ANY_SOURCE,
                             CONTROL_MSG_TAG,
                             module->p2p_comm,
                             &new_pt2pt_buffer->request));
    assert(OMPI_SUCCESS == ret);
    opal_list_append(&module->p2p_pending_control_sends, 
                     &new_pt2pt_buffer->super.super);

    assert(buffer_len >=
           sizeof(ompi_osc_pt2pt_base_header_t));

    /* handle message */
    switch (((ompi_osc_pt2pt_base_header_t*) buffer)->hdr_type) {
    case OMPI_OSC_PT2PT_HDR_PUT:
        {
            ompi_osc_pt2pt_send_header_t *header;

            /* get our header and payload */
            header = (ompi_osc_pt2pt_send_header_t*) 
                buffer;
            payload = (void*) (header + 1);

#if !defined(WORDS_BIGENDIAN) && OMPI_ENABLE_HETEROGENEOUS_SUPPORT
            if (header->hdr_base.hdr_flags & OMPI_OSC_PT2PT_HDR_FLAG_NBO) {
                OMPI_OSC_PT2PT_SEND_HDR_NTOH(*header);
            }
#endif

            assert(module == ompi_osc_pt2pt_windx_to_module(header->hdr_windx));

            if (!ompi_win_exposure_epoch(module->p2p_win)) {
                if (OMPI_WIN_FENCE & ompi_win_get_mode(module->p2p_win)) {
                    /* well, we're definitely in an access epoch now */
                    ompi_win_set_mode(module->p2p_win, 
                                      OMPI_WIN_FENCE | 
                                      OMPI_WIN_ACCESS_EPOCH |
                                      OMPI_WIN_EXPOSE_EPOCH);
                }
            }

            ret = ompi_osc_pt2pt_sendreq_recv_put(module, header, payload);
        }
        break;

    case OMPI_OSC_PT2PT_HDR_ACC: 
        {
            ompi_osc_pt2pt_send_header_t *header;

            /* get our header and payload */
            header = (ompi_osc_pt2pt_send_header_t*) 
                buffer;
            payload = (void*) (header + 1);

#if !defined(WORDS_BIGENDIAN) && OMPI_ENABLE_HETEROGENEOUS_SUPPORT
            if (header->hdr_base.hdr_flags & OMPI_OSC_PT2PT_HDR_FLAG_NBO) {
                OMPI_OSC_PT2PT_SEND_HDR_NTOH(*header);
            }
#endif

            assert(module == ompi_osc_pt2pt_windx_to_module(header->hdr_windx));

            if (!ompi_win_exposure_epoch(module->p2p_win)) {
                if (OMPI_WIN_FENCE & ompi_win_get_mode(module->p2p_win)) {
                    /* well, we're definitely in an access epoch now */
                    ompi_win_set_mode(module->p2p_win, 
                                      OMPI_WIN_FENCE | 
                                      OMPI_WIN_ACCESS_EPOCH |
                                      OMPI_WIN_EXPOSE_EPOCH);
                }
            }

            /* receive into temporary buffer */
            ret = ompi_osc_pt2pt_sendreq_recv_accum(module, header, payload);
        }
        break;

    case OMPI_OSC_PT2PT_HDR_GET:
        {
            ompi_datatype_t *datatype;
            ompi_osc_pt2pt_send_header_t *header;
            ompi_osc_pt2pt_replyreq_t *replyreq;
            ompi_proc_t *proc;

            /* get our header and payload */
            header = (ompi_osc_pt2pt_send_header_t*) 
                buffer;
            payload = (void*) (header + 1);

#if !defined(WORDS_BIGENDIAN) && OMPI_ENABLE_HETEROGENEOUS_SUPPORT
            if (header->hdr_base.hdr_flags & OMPI_OSC_PT2PT_HDR_FLAG_NBO) {
                OMPI_OSC_PT2PT_SEND_HDR_NTOH(*header);
            }
#endif

            assert(module == ompi_osc_pt2pt_windx_to_module(header->hdr_windx));

            if (!ompi_win_exposure_epoch(module->p2p_win)) {
                if (OMPI_WIN_FENCE & ompi_win_get_mode(module->p2p_win)) {
                    /* well, we're definitely in an access epoch now */
                    ompi_win_set_mode(module->p2p_win, 
                                      OMPI_WIN_FENCE | 
                                      OMPI_WIN_ACCESS_EPOCH |
                                      OMPI_WIN_EXPOSE_EPOCH);
                }
            }

            /* create or get a pointer to our datatype */
            proc = ompi_comm_peer_lookup( module->p2p_comm, header->hdr_origin );
            datatype = ompi_osc_pt2pt_datatype_create(proc, &payload);

            /* create replyreq sendreq */
            ret = ompi_osc_pt2pt_replyreq_alloc_init(module,
                                                  header->hdr_origin,
                                                  header->hdr_origin_sendreq,
                                                  header->hdr_target_disp,
                                                  header->hdr_target_count,
                                                  datatype,
                                                  &replyreq);

            /* send replyreq */
            ompi_osc_pt2pt_replyreq_send(module, replyreq);

            /* sendreq does the right retain, so we can release safely */
            OBJ_RELEASE(datatype);
        }
        break;

    case OMPI_OSC_PT2PT_HDR_REPLY:
        {
            ompi_osc_pt2pt_reply_header_t *header;
            ompi_osc_pt2pt_sendreq_t *sendreq;

            /* get our header and payload */
            header = (ompi_osc_pt2pt_reply_header_t*) 
                buffer;
            payload = (void*) (header + 1);

#if !defined(WORDS_BIGENDIAN) && OMPI_ENABLE_HETEROGENEOUS_SUPPORT
            if (header->hdr_base.hdr_flags & OMPI_OSC_PT2PT_HDR_FLAG_NBO) {
                OMPI_OSC_PT2PT_REPLY_HDR_NTOH(*header);
            }
#endif

            /* get original sendreq pointer */
            sendreq = (ompi_osc_pt2pt_sendreq_t*) header->hdr_origin_sendreq.pval;
            module = sendreq->req_module;

            /* receive data */
            ompi_osc_pt2pt_replyreq_recv(module, sendreq, header, payload);
        }
        break;
    case OMPI_OSC_PT2PT_HDR_POST:
        {
            ompi_osc_pt2pt_control_header_t *header = 
                (ompi_osc_pt2pt_control_header_t*) 
                buffer;

#if !defined(WORDS_BIGENDIAN) && OMPI_ENABLE_HETEROGENEOUS_SUPPORT
            if (header->hdr_base.hdr_flags & OMPI_OSC_PT2PT_HDR_FLAG_NBO) {
                OMPI_OSC_PT2PT_CONTROL_HDR_NTOH(*header);
            }
#endif

            assert(module == ompi_osc_pt2pt_windx_to_module(header->hdr_windx));

            OPAL_THREAD_ADD32(&(module->p2p_num_post_msgs), -1);
        }
        break;
    case OMPI_OSC_PT2PT_HDR_COMPLETE:
        {
            ompi_osc_pt2pt_control_header_t *header = 
                (ompi_osc_pt2pt_control_header_t*) 
                buffer;

#if !defined(WORDS_BIGENDIAN) && OMPI_ENABLE_HETEROGENEOUS_SUPPORT
            if (header->hdr_base.hdr_flags & OMPI_OSC_PT2PT_HDR_FLAG_NBO) {
                OMPI_OSC_PT2PT_CONTROL_HDR_NTOH(*header);
            }
#endif

            assert(module = ompi_osc_pt2pt_windx_to_module(header->hdr_windx));

            /* we've heard from one more place, and have value reqs to
               process */
            OPAL_THREAD_ADD32(&(module->p2p_num_complete_msgs), -1);
            OPAL_THREAD_ADD32(&(module->p2p_num_pending_in), header->hdr_value[0]);
        }
        break;

    case OMPI_OSC_PT2PT_HDR_LOCK_REQ:
        {
            ompi_osc_pt2pt_control_header_t *header = 
                (ompi_osc_pt2pt_control_header_t*) 
                buffer;

#if !defined(WORDS_BIGENDIAN) && OMPI_ENABLE_HETEROGENEOUS_SUPPORT
            if (header->hdr_base.hdr_flags & OMPI_OSC_PT2PT_HDR_FLAG_NBO) {
                OMPI_OSC_PT2PT_CONTROL_HDR_NTOH(*header);
            }
#endif

            assert(module == ompi_osc_pt2pt_windx_to_module(header->hdr_windx));

            if (header->hdr_value[1] > 0) {
                ompi_osc_pt2pt_passive_lock(module, header->hdr_value[0], 
                                            header->hdr_value[1]);
            } else {
                OPAL_THREAD_ADD32(&(module->p2p_lock_received_ack), 1);
            }
        }
        break;

    case OMPI_OSC_PT2PT_HDR_UNLOCK_REQ:
        {
            ompi_osc_pt2pt_control_header_t *header = 
                (ompi_osc_pt2pt_control_header_t*) 
                buffer;

#if !defined(WORDS_BIGENDIAN) && OMPI_ENABLE_HETEROGENEOUS_SUPPORT
            if (header->hdr_base.hdr_flags & OMPI_OSC_PT2PT_HDR_FLAG_NBO) {
                OMPI_OSC_PT2PT_CONTROL_HDR_NTOH(*header);
            }
#endif

            assert(module == ompi_osc_pt2pt_windx_to_module(header->hdr_windx));

            ompi_osc_pt2pt_passive_unlock(module, header->hdr_value[0],
                                          header->hdr_value[1]);
        }
        break;

    default:
        opal_output_verbose(5, ompi_osc_base_output,
                            "received packet for Window with unknown type");
   }

    item = &(pt2pt_buffer->super);
    OPAL_FREE_LIST_RETURN(&mca_osc_pt2pt_component.p2p_c_buffers,
                          item);
}



static int
ompi_osc_pt2pt_request_test(ompi_request_t ** rptr,
                            int *completed,
                            ompi_status_public_t * status )
{
#if OMPI_ENABLE_PROGRESS_THREADS == 0
    ompi_request_t *request = *rptr;
#endif
    int ret = OMPI_SUCCESS;

#if OMPI_ENABLE_PROGRESS_THREADS == 0
    if (request->req_state == OMPI_REQUEST_INACTIVE ||
        request->req_complete) {
        ret = ompi_request_test(rptr, completed, status);
    } else {
        *completed = 0;
    }
#else
    ret = ompi_request_test(rptr, completed, status);
#endif

    return ret;
}

int
ompi_osc_pt2pt_progress(void)
{
    int ret, done, count = 0;
    void *node;
    uint32_t key;
    ompi_osc_pt2pt_module_t *module;
    opal_list_item_t *item;

    ret = opal_hash_table_get_first_key_uint32(&mca_osc_pt2pt_component.p2p_c_modules,
                                               &key,
                                               (void**) &module,
                                               &node);
    if (OMPI_SUCCESS != ret) return 0;

    do {
        /* loop through pending requests */
        for (item = opal_list_get_first(&module->p2p_pending_control_sends) ;
             item != opal_list_get_end(&module->p2p_pending_control_sends) ;
             item = opal_list_get_next(item)) {
            ompi_osc_pt2pt_buffer_t *buffer = 
                (ompi_osc_pt2pt_buffer_t*) item;

            ret = ompi_osc_pt2pt_request_test(&buffer->request, &done, &buffer->status);
            if (OMPI_SUCCESS == ret && done) {
                item = opal_list_remove_item(&module->p2p_pending_control_sends, 
                                             item);
                buffer->cbfunc(buffer);
            }
        }
    } while (OMPI_SUCCESS ==
             opal_hash_table_get_next_key_uint32(&mca_osc_pt2pt_component.p2p_c_modules,
                                                 &key,
                                                 (void**) &module,
                                                 node,
                                                 &node));

    return count;
}