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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2011 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2009 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2007 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) 2006-2007 Voltaire. All rights reserved.
* Copyright (c) 2009 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2010-2014 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2021 Google, LLC. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#include "opal/mca/btl/sm/btl_sm.h"
#include "opal/mca/btl/sm/btl_sm_fbox.h"
#include "opal/mca/btl/sm/btl_sm_fifo.h"
#include "opal/mca/btl/sm/btl_sm_frag.h"
/**
* Initiate a send to the peer.
*
* @param btl (IN) BTL module
* @param peer (IN) BTL peer addressing
*/
int mca_btl_sm_send(struct mca_btl_base_module_t *btl, struct mca_btl_base_endpoint_t *endpoint,
struct mca_btl_base_descriptor_t *descriptor, mca_btl_base_tag_t tag)
{
mca_btl_sm_frag_t *frag = (mca_btl_sm_frag_t *) descriptor;
const size_t total_size = frag->segments[0].seg_len;
if (frag->base.des_cbfunc) {
/* in order to work around a long standing ob1 bug (see #3845) we have to always
* make the callback. once this is fixed in ob1 we can restore the code below. */
frag->base.des_flags |= MCA_BTL_DES_SEND_ALWAYS_CALLBACK;
}
/* header (+ optional inline data) */
frag->hdr->len = total_size;
/* type of message, pt-2-pt, one-sided, etc */
frag->hdr->tag = tag;
/* clear the complete flag if it has been set */
frag->hdr->flags &= ~MCA_BTL_SM_FLAG_COMPLETE;
/* post the relative address of the descriptor into the peer's fifo */
if (opal_list_get_size(&endpoint->pending_frags) || !sm_fifo_write_ep(frag->hdr, endpoint)) {
if (frag->base.des_cbfunc) {
frag->base.des_flags |= MCA_BTL_DES_SEND_ALWAYS_CALLBACK;
}
OPAL_THREAD_LOCK(&endpoint->pending_frags_lock);
opal_list_append(&endpoint->pending_frags, (opal_list_item_t *) frag);
if (!endpoint->waiting) {
OPAL_THREAD_LOCK(&mca_btl_sm_component.lock);
opal_list_append(&mca_btl_sm_component.pending_endpoints, &endpoint->super);
OPAL_THREAD_UNLOCK(&mca_btl_sm_component.lock);
endpoint->waiting = true;
}
OPAL_THREAD_UNLOCK(&endpoint->pending_frags_lock);
return OPAL_SUCCESS;
}
return OPAL_SUCCESS;
}
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