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openmpi/ompi/mca/pml/dr/pml_dr_sendreq.c
Abhishek Kulkarni afbe3e99c6 * Wrap all the direct error-code checks of the form (OMPI_ERR_* == ret) with 
(OMPI_ERR_* = OPAL_SOS_GET_ERR_CODE(ret)), since the return value could be a
 SOS-encoded error. The OPAL_SOS_GET_ERR_CODE() takes in a SOS error and returns
 back the native error code.

* Since OPAL_SUCCESS is preserved by SOS, also change all calls of the form
  (OPAL_ERROR == ret) to (OPAL_SUCCESS != ret). We thus avoid having to
  decode 'ret' to get the native error code.

This commit was SVN r23162.
2010-05-17 23:08:56 +00:00

1172 строки
45 KiB
C
Исходник Ответственный История

/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2007 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) 2004-2006 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2007 Mellanox Technologies.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
#include "ompi_config.h"
#include "opal/util/crc.h"
#include "ompi/constants.h"
#include "ompi/mca/pml/pml.h"
#include "ompi/mca/btl/btl.h"
#include "ompi/class/ompi_seq_tracker.h"
#include "orte/mca/errmgr/errmgr.h"
#include "pml_dr.h"
#include "pml_dr_hdr.h"
#include "pml_dr_sendreq.h"
#include "pml_dr_recvreq.h"
#include "ompi/mca/bml/base/base.h"
/*
* The free call mark the final stage in a request life-cycle. Starting from this
* point the request is completed at both PML and user level, and can be used
* for others p2p communications. Therefore, in the case of the DR PML it should
* be added to the free request list.
*/
static int mca_pml_dr_send_request_free(struct ompi_request_t** request)
{
mca_pml_dr_send_request_t* sendreq = *(mca_pml_dr_send_request_t**)request;
assert( false == sendreq->req_send.req_base.req_free_called );
OPAL_THREAD_LOCK(&ompi_request_lock);
sendreq->req_send.req_base.req_free_called = true;
if( true == sendreq->req_send.req_base.req_pml_complete ) {
MCA_PML_DR_SEND_REQUEST_RETURN( sendreq );
}
OPAL_THREAD_UNLOCK(&ompi_request_lock);
*request = MPI_REQUEST_NULL;
return OMPI_SUCCESS;
}
static int mca_pml_dr_send_request_cancel(struct ompi_request_t* request, int complete)
{
/* we dont cancel send requests by now */
return OMPI_SUCCESS;
}
static void mca_pml_dr_send_request_construct(mca_pml_dr_send_request_t* req)
{
OBJ_CONSTRUCT(&req->req_vfrag0, mca_pml_dr_vfrag_t);
OBJ_CONSTRUCT(&req->req_retrans, opal_list_t);
req->req_vfrag0.vf_len = 1;
req->req_vfrag0.vf_mask = 1;
req->req_vfrag0.vf_send.pval = req;
req->req_send.req_base.req_type = MCA_PML_REQUEST_SEND;
req->req_send.req_base.req_ompi.req_free = mca_pml_dr_send_request_free;
req->req_send.req_base.req_ompi.req_cancel = mca_pml_dr_send_request_cancel;
}
static void mca_pml_dr_send_request_destruct(mca_pml_dr_send_request_t* req)
{
OBJ_DESTRUCT(&req->req_vfrag0);
OBJ_DESTRUCT(&req->req_retrans);
}
OBJ_CLASS_INSTANCE(
mca_pml_dr_send_request_t,
mca_pml_base_send_request_t,
mca_pml_dr_send_request_construct,
mca_pml_dr_send_request_destruct);
/**
* Handle error status on local completion
*/
static void mca_pml_dr_error_completion(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* ep,
struct mca_btl_base_descriptor_t* descriptor,
int status)
{
mca_pml_dr_vfrag_t* vfrag = (mca_pml_dr_vfrag_t*)descriptor->des_cbdata;
mca_pml_dr_send_request_t* sendreq = (mca_pml_dr_send_request_t*)vfrag->vf_send.pval;
switch(OPAL_SOS_GET_ERROR_CODE(status)) {
case OMPI_ERR_UNREACH:
case OMPI_ERR_CONNECTION_FAILED:
case OMPI_ERR_CONNECTION_REFUSED:
/**
* peer is no longer reachable through this btl
*/
mca_bml.bml_del_proc_btl(sendreq->req_proc->ompi_proc, btl);
break;
case OMPI_ERR_FATAL:
case OMPI_ERR_COMM_FAILURE:
/**
* btl is no longer available
*/
mca_bml.bml_del_btl(btl);
break;
default:
orte_errmgr.abort(-1, NULL);
break;
}
/* update pending counts */
OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth,-1);
OPAL_THREAD_ADD64(&vfrag->vf_pending,-1);
/* reset vfrag state - select new BTL */
mca_pml_dr_vfrag_reset(vfrag);
/* reschedule vfrag */
mca_pml_dr_vfrag_reschedule(vfrag);
}
/**
* Completion of a short message - nothing left to schedule.
*/
static void mca_pml_dr_match_completion(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* ep,
struct mca_btl_base_descriptor_t* descriptor,
int status)
{
mca_pml_dr_vfrag_t* vfrag = (mca_pml_dr_vfrag_t*)descriptor->des_cbdata;
mca_pml_dr_send_request_t* sendreq = (mca_pml_dr_send_request_t*)vfrag->vf_send.pval;
/* kill pending wdog timer */
MCA_PML_DR_VFRAG_WDOG_STOP(vfrag);
/* free any descriptor used to retransmit */
if(descriptor != sendreq->req_descriptor) {
mca_bml_base_free( (mca_bml_base_btl_t*)descriptor->des_context, descriptor);
}
/* check completion status */
if(OMPI_SUCCESS != status) {
mca_pml_dr_error_completion(btl,ep,descriptor,status);
return;
}
/* wait for local completion */
OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth,-1);
if(OPAL_THREAD_ADD64(&vfrag->vf_pending,-1) > 0)
return;
/* wait for positive ack to complete request */
OPAL_THREAD_LOCK(&ompi_request_lock);
if(vfrag->vf_ack == vfrag->vf_mask) {
/* return descriptor */
if(NULL != sendreq->req_descriptor) {
if(NULL != sendreq->req_descriptor->des_context) {
mca_bml_base_free((mca_bml_base_btl_t*)sendreq->req_descriptor->des_context, sendreq->req_descriptor);
}
sendreq->req_descriptor = NULL;
}
/* update statistics and complete */
sendreq->req_bytes_delivered = sendreq->req_send.req_bytes_packed;
MCA_PML_DR_DEBUG(1, (0, "%s:%d: inserting vid %d into sequence tracker\n",
__FILE__, __LINE__, vfrag->vf_id));
ompi_seq_tracker_insert(&sendreq->req_endpoint->seq_sends, vfrag->vf_id);
MCA_PML_DR_SEND_REQUEST_PML_COMPLETE(sendreq);
/* on negative ack need to retransmit */
} else if(vfrag->vf_state & MCA_PML_DR_VFRAG_NACKED) {
MCA_PML_DR_VFRAG_WDOG_START(vfrag);
MCA_PML_DR_SEND_REQUEST_EAGER_RETRY(sendreq, vfrag);
/* start ack timer */
} else {
MCA_PML_DR_VFRAG_ACK_START(vfrag);
}
OPAL_THREAD_UNLOCK(&ompi_request_lock);
/* check for pending requests */
MCA_PML_DR_SEND_REQUEST_PROCESS_PENDING();
}
/*
* Completion of the first fragment of a long message that
* requires an acknowledgement
*/
static void mca_pml_dr_rndv_completion(
mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* ep,
struct mca_btl_base_descriptor_t* descriptor,
int status)
{
mca_pml_dr_vfrag_t* vfrag = (mca_pml_dr_vfrag_t*)descriptor->des_cbdata;
mca_pml_dr_send_request_t* sendreq = (mca_pml_dr_send_request_t*)vfrag->vf_send.pval;
bool schedule = false;
/* kill pending wdog timer */
MCA_PML_DR_VFRAG_WDOG_STOP(vfrag);
/* free any descriptor used to retransmit */
if(descriptor != sendreq->req_descriptor) {
mca_bml_base_free( (mca_bml_base_btl_t*)descriptor->des_context, descriptor );
}
/* check completion status */
if(OMPI_SUCCESS != status) {
mca_pml_dr_error_completion(btl,ep,descriptor,status);
return;
}
/* local completion */
OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth,-1);
if(OPAL_THREAD_ADD64(&vfrag->vf_pending,-1) > 0)
return;
/* wait for positive ack to complete request */
OPAL_THREAD_LOCK(&ompi_request_lock);
if(vfrag->vf_ack == vfrag->vf_mask) {
if(sendreq->req_descriptor) {
if(NULL != sendreq->req_descriptor->des_context) {
mca_bml_base_free((mca_bml_base_btl_t*)sendreq->req_descriptor->des_context, sendreq->req_descriptor);
}
sendreq->req_descriptor = NULL;
}
/* update statistics and complete */
MCA_PML_DR_DEBUG(1, (0, "%s:%d: inserting vid %d into sequence tracker\n",
__FILE__, __LINE__, vfrag->vf_id));
ompi_seq_tracker_insert(&sendreq->req_endpoint->seq_sends, vfrag->vf_id);
if(sendreq->req_bytes_delivered == sendreq->req_send.req_bytes_packed) {
MCA_PML_DR_SEND_REQUEST_PML_COMPLETE(sendreq);
} else {
schedule = true;
}
OPAL_THREAD_UNLOCK(&ompi_request_lock);
if(schedule) {
mca_pml_dr_send_request_schedule(sendreq);
}
/* on negative ack need to retransmit */
} else if(vfrag->vf_state & MCA_PML_DR_VFRAG_NACKED) {
MCA_PML_DR_VFRAG_ACK_RESET(vfrag);
MCA_PML_DR_SEND_REQUEST_RNDV_PROBE(sendreq, vfrag);
OPAL_THREAD_UNLOCK(&ompi_request_lock);
/* setup ack timer */
} else {
OPAL_THREAD_UNLOCK(&ompi_request_lock);
MCA_PML_DR_VFRAG_ACK_START(vfrag);
}
/* check for pending requests */
MCA_PML_DR_SEND_REQUEST_PROCESS_PENDING();
}
/**
* Completion of additional fragments of a large message - may need
* to schedule additional fragments.
*/
static void mca_pml_dr_frag_completion(
mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* ep,
struct mca_btl_base_descriptor_t* descriptor,
int status)
{
mca_pml_dr_vfrag_t* vfrag = (mca_pml_dr_vfrag_t*)descriptor->des_cbdata;
mca_pml_dr_send_request_t* sendreq = (mca_pml_dr_send_request_t*)vfrag->vf_send.pval;
mca_bml_base_btl_t* bml_btl = vfrag->bml_btl;
bool schedule = false;
/* check completion status */
if(OMPI_SUCCESS != status) {
mca_pml_dr_error_completion(btl,ep,descriptor,status);
return;
}
/* have all pending frags completed for this vfrag? */
OPAL_THREAD_LOCK(&ompi_request_lock);
vfrag->vf_pending -= 1;
if(vfrag->vf_pending == 0) {
MCA_PML_DR_VFRAG_WDOG_STOP(vfrag);
/* has the vfrag already been acked */
if (vfrag->vf_ack == vfrag->vf_mask) {
sendreq->req_bytes_delivered += vfrag->vf_size;
assert(sendreq->req_bytes_delivered <= sendreq->req_send.req_bytes_packed);
/* is this vfrag in the process of being retransmitted */
if(vfrag->vf_state & MCA_PML_DR_VFRAG_RETRANS) {
opal_list_remove_item(&sendreq->req_retrans, (opal_list_item_t*)vfrag);
vfrag->vf_state &= ~MCA_PML_DR_VFRAG_RETRANS;
}
/* record vfrag id to drop duplicate acks */
MCA_PML_DR_DEBUG(1, (0, "%s:%d: inserting vid %d into sequence tracker\n",
__FILE__, __LINE__, vfrag->vf_id));
ompi_seq_tracker_insert(&sendreq->req_endpoint->seq_sends, vfrag->vf_id);
/* return this vfrag */
MCA_PML_DR_VFRAG_RETURN(vfrag);
/* waiting on ack */
} else if (vfrag->vf_idx == vfrag->vf_len) {
MCA_PML_DR_VFRAG_ACK_START(vfrag);
}
/* if not reset the watchdog timer */
} else {
MCA_PML_DR_VFRAG_WDOG_RESET(vfrag);
}
/* are we done with this request ? */
if(OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth, -1) == 0 &&
sendreq->req_bytes_delivered == sendreq->req_send.req_bytes_packed) {
MCA_PML_DR_SEND_REQUEST_PML_COMPLETE(sendreq);
} else if (sendreq->req_send_offset < sendreq->req_send.req_bytes_packed ||
opal_list_get_size(&sendreq->req_retrans)) {
schedule = true;
}
OPAL_THREAD_UNLOCK(&ompi_request_lock);
/* return the descriptor */
mca_bml_base_free(bml_btl, descriptor);
/* schedule remainder of message? */
if(schedule) {
mca_pml_dr_send_request_schedule(sendreq);
}
/* check for pending requests */
MCA_PML_DR_SEND_REQUEST_PROCESS_PENDING();
}
/**
* Buffer the entire message and mark as complete.
*/
int mca_pml_dr_send_request_start_buffered(
mca_pml_dr_send_request_t* sendreq,
mca_bml_base_btl_t* bml_btl,
size_t size)
{
mca_btl_base_descriptor_t* descriptor;
mca_btl_base_segment_t* segment;
mca_pml_dr_hdr_t* hdr;
struct iovec iov;
unsigned int iov_count;
size_t max_data;
int rc;
uint32_t csum;
bool do_csum = mca_pml_dr.enable_csum &&
(bml_btl->btl_flags & MCA_BTL_FLAGS_NEED_CSUM);
/* allocate descriptor */
mca_bml_base_alloc(bml_btl, &descriptor, MCA_BTL_NO_ORDER,
sizeof(mca_pml_dr_rendezvous_hdr_t) + size,
MCA_BTL_DES_FLAGS_PRIORITY);
if(NULL == descriptor) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
sendreq->req_descriptor = descriptor; /* hang on to this for later */
segment = descriptor->des_src;
/* pack the data into the BTL supplied buffer */
iov.iov_base = (IOVBASE_TYPE*)((unsigned char*)segment->seg_addr.pval +
sizeof(mca_pml_dr_rendezvous_hdr_t));
iov.iov_len = size;
iov_count = 1;
max_data = size;
if((rc = opal_convertor_pack( &sendreq->req_send.req_base.req_convertor,
&iov,
&iov_count,
&max_data)) < 0) {
mca_bml_base_free(bml_btl, descriptor);
return rc;
}
csum = sendreq->req_send.req_base.req_convertor.checksum;
/* update lengths */
segment->seg_len = sizeof(mca_pml_dr_rendezvous_hdr_t) + max_data;
sendreq->req_vfrag0.vf_size = max_data;
sendreq->req_vfrag0.bml_btl = bml_btl;
sendreq->req_vfrag0.vf_state |= MCA_PML_DR_VFRAG_RNDV;
sendreq->req_vfrag0.vf_pending = 1;
descriptor->des_cbfunc = mca_pml_dr_rndv_completion;
descriptor->des_flags |= MCA_BTL_DES_FLAGS_PRIORITY;
descriptor->des_cbdata = &sendreq->req_vfrag0;
/* buffer the remainder of the message */
rc = mca_pml_base_bsend_request_alloc((ompi_request_t*)sendreq);
if(OMPI_SUCCESS != rc) {
mca_bml_base_free(bml_btl, descriptor);
return rc;
}
iov.iov_base = (IOVBASE_TYPE*)(((unsigned char*)sendreq->req_send.req_addr) + max_data);
iov.iov_len = sendreq->req_send.req_bytes_packed - max_data;
max_data = iov.iov_len;
if((rc = opal_convertor_pack( &sendreq->req_send.req_base.req_convertor,
&iov,
&iov_count,
&max_data)) < 0) {
mca_bml_base_free(bml_btl, descriptor);
return rc;
}
/* build rendezvous header */
hdr = (mca_pml_dr_hdr_t*)segment->seg_addr.pval;
hdr->hdr_common.hdr_flags = 0;
hdr->hdr_common.hdr_csum = 0;
hdr->hdr_common.hdr_type = MCA_PML_DR_HDR_TYPE_RNDV;
hdr->hdr_common.hdr_dst = sendreq->req_endpoint->dst;
hdr->hdr_common.hdr_src = sendreq->req_endpoint->src;
hdr->hdr_common.hdr_ctx = sendreq->req_send.req_base.req_comm->c_contextid;
hdr->hdr_common.hdr_vid = sendreq->req_vfrag0.vf_id;
hdr->hdr_match.hdr_tag = sendreq->req_send.req_base.req_tag;
hdr->hdr_match.hdr_seq = sendreq->req_send.req_base.req_sequence;
hdr->hdr_match.hdr_csum = csum;
hdr->hdr_match.hdr_src_ptr.pval = &sendreq->req_vfrag0;
hdr->hdr_rndv.hdr_msg_length = sendreq->req_send.req_bytes_packed;
hdr->hdr_common.hdr_csum = (do_csum ?
opal_csum(hdr, sizeof(mca_pml_dr_rendezvous_hdr_t)) :
OPAL_CSUM_ZERO);
/* re-init convertor for packed data (it keep the flags) */
opal_convertor_prepare_for_send( &sendreq->req_send.req_base.req_convertor,
&(ompi_mpi_byte.dt.super),
sendreq->req_send.req_bytes_packed,
sendreq->req_send.req_addr );
/* request is complete at mpi level */
OPAL_THREAD_LOCK(&ompi_request_lock);
MCA_PML_DR_SEND_REQUEST_MPI_COMPLETE(sendreq);
OPAL_THREAD_UNLOCK(&ompi_request_lock);
/* send */
MCA_PML_DR_VFRAG_WDOG_START(&sendreq->req_vfrag0);
rc = mca_bml_base_send(bml_btl, descriptor, MCA_BTL_TAG_PML);
if(OMPI_SUCCESS != rc) {
mca_bml_base_free(bml_btl, descriptor );
}
return rc;
}
/**
* BTL requires "specially" allocated memory. Request a segment that
* is used for initial hdr and any eager data.
*/
int mca_pml_dr_send_request_start_copy(
mca_pml_dr_send_request_t* sendreq,
mca_bml_base_btl_t* bml_btl,
size_t size)
{
mca_btl_base_descriptor_t* descriptor;
mca_btl_base_segment_t* segment;
mca_pml_dr_hdr_t* hdr;
struct iovec iov;
unsigned int iov_count;
size_t max_data;
int rc;
bool do_csum = mca_pml_dr.enable_csum &&
(bml_btl->btl_flags & MCA_BTL_FLAGS_NEED_CSUM);
/* allocate descriptor */
mca_bml_base_alloc(bml_btl, &descriptor,
MCA_BTL_NO_ORDER,
sizeof(mca_pml_dr_match_hdr_t) + size,
MCA_BTL_DES_FLAGS_PRIORITY);
if(NULL == descriptor) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
sendreq->req_descriptor = descriptor; /* hang on to this for later */
segment = descriptor->des_src;
/* pack the data into the supplied buffer */
iov.iov_base = (IOVBASE_TYPE*)((unsigned char*)segment->seg_addr.pval + sizeof(mca_pml_dr_match_hdr_t));
iov.iov_len = size;
iov_count = 1;
max_data = size;
if(size > 0) {
if((rc = opal_convertor_pack( &sendreq->req_send.req_base.req_convertor,
&iov,
&iov_count,
&max_data)) < 0) {
mca_bml_base_free(bml_btl, descriptor);
return rc;
}
}
/* build match header */
hdr = (mca_pml_dr_hdr_t*)segment->seg_addr.pval;
hdr->hdr_common.hdr_flags = 0;
hdr->hdr_common.hdr_csum = 0;
hdr->hdr_common.hdr_type = MCA_PML_DR_HDR_TYPE_MATCH;
hdr->hdr_common.hdr_dst = sendreq->req_endpoint->dst;
hdr->hdr_common.hdr_ctx = sendreq->req_send.req_base.req_comm->c_contextid;
hdr->hdr_common.hdr_src = sendreq->req_endpoint->src;
hdr->hdr_match.hdr_tag = sendreq->req_send.req_base.req_tag;
hdr->hdr_match.hdr_seq = sendreq->req_send.req_base.req_sequence;
hdr->hdr_match.hdr_csum = (size > 0 && do_csum ?
sendreq->req_send.req_base.req_convertor.checksum : OPAL_CSUM_ZERO);
hdr->hdr_match.hdr_src_ptr.pval = &sendreq->req_vfrag0;
hdr->hdr_common.hdr_vid = sendreq->req_vfrag0.vf_id;
hdr->hdr_common.hdr_csum = (do_csum ?
opal_csum(hdr, sizeof(mca_pml_dr_match_hdr_t)) :
OPAL_CSUM_ZERO);
/* vfrag status */
sendreq->req_vfrag0.vf_size = max_data;
sendreq->req_vfrag0.bml_btl = bml_btl;
sendreq->req_vfrag0.vf_pending = 1;
/* short message */
descriptor->des_cbfunc = mca_pml_dr_match_completion;
descriptor->des_flags |= MCA_BTL_DES_FLAGS_PRIORITY;
descriptor->des_cbdata = &sendreq->req_vfrag0;
segment->seg_len = sizeof(mca_pml_dr_match_hdr_t) + max_data;
/* signal request completion */
OPAL_THREAD_LOCK(&ompi_request_lock);
MCA_PML_DR_SEND_REQUEST_MPI_COMPLETE(sendreq);
OPAL_THREAD_UNLOCK(&ompi_request_lock);
/* send */
MCA_PML_DR_VFRAG_WDOG_START(&sendreq->req_vfrag0);
rc = mca_bml_base_send(bml_btl, descriptor, MCA_BTL_TAG_PML);
if(OMPI_SUCCESS != rc) {
mca_bml_base_free(bml_btl, descriptor );
}
return rc;
}
/**
* BTL can send directly from user buffer so allow the BTL
* to prepare the segment list.
*/
int mca_pml_dr_send_request_start_prepare(
mca_pml_dr_send_request_t* sendreq,
mca_bml_base_btl_t* bml_btl,
size_t size)
{
mca_btl_base_descriptor_t* descriptor;
mca_btl_base_segment_t* segment;
mca_pml_dr_hdr_t* hdr;
int rc;
bool do_csum = mca_pml_dr.enable_csum &&
(bml_btl->btl_flags & MCA_BTL_FLAGS_NEED_CSUM);
/* prepare descriptor */
mca_bml_base_prepare_src( bml_btl,
NULL,
&sendreq->req_send.req_base.req_convertor,
MCA_BTL_NO_ORDER,
sizeof(mca_pml_dr_match_hdr_t),
&size,
MCA_BTL_DES_FLAGS_PRIORITY,
&descriptor );
if(NULL == descriptor) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
sendreq->req_descriptor = descriptor; /* hang on to this for later */
segment = descriptor->des_src;
/* build match header */
hdr = (mca_pml_dr_hdr_t*)segment->seg_addr.pval;
hdr->hdr_common.hdr_flags = 0;
hdr->hdr_common.hdr_csum = 0;
hdr->hdr_common.hdr_type = MCA_PML_DR_HDR_TYPE_MATCH;
hdr->hdr_common.hdr_dst = sendreq->req_endpoint->dst;
hdr->hdr_common.hdr_ctx = sendreq->req_send.req_base.req_comm->c_contextid;
hdr->hdr_common.hdr_src = sendreq->req_endpoint->src;
hdr->hdr_match.hdr_tag = sendreq->req_send.req_base.req_tag;
hdr->hdr_match.hdr_seq = sendreq->req_send.req_base.req_sequence;
hdr->hdr_match.hdr_csum = (size > 0 && do_csum ?
sendreq->req_send.req_base.req_convertor.checksum : OPAL_CSUM_ZERO);
hdr->hdr_match.hdr_src_ptr.pval = &sendreq->req_vfrag0;
hdr->hdr_common.hdr_vid = sendreq->req_vfrag0.vf_id;
hdr->hdr_common.hdr_csum = (do_csum ?
opal_csum(hdr, sizeof(mca_pml_dr_match_hdr_t)) :
OPAL_CSUM_ZERO);
/* short message */
descriptor->des_cbfunc = mca_pml_dr_match_completion;
descriptor->des_flags |= MCA_BTL_DES_FLAGS_PRIORITY;
descriptor->des_cbdata = &sendreq->req_vfrag0;
/* vfrag state */
sendreq->req_vfrag0.vf_size = size;
sendreq->req_vfrag0.bml_btl = bml_btl;
sendreq->req_vfrag0.vf_pending = 1;
/* send */
MCA_PML_DR_VFRAG_WDOG_START(&sendreq->req_vfrag0);
rc = mca_bml_base_send(bml_btl, descriptor, MCA_BTL_TAG_PML);
if(OMPI_SUCCESS != rc) {
mca_bml_base_free(bml_btl, descriptor );
}
return rc;
}
/**
* Rendezvous is required. Eager send up to
* the btls eager limit.
*/
int mca_pml_dr_send_request_start_rndv(
mca_pml_dr_send_request_t* sendreq,
mca_bml_base_btl_t* bml_btl,
size_t size,
int flags)
{
mca_btl_base_descriptor_t* des;
mca_btl_base_segment_t* segment;
mca_pml_dr_hdr_t* hdr;
int rc;
bool do_csum = mca_pml_dr.enable_csum &&
(bml_btl->btl_flags & MCA_BTL_FLAGS_NEED_CSUM);
/* prepare descriptor */
if(size == 0) {
mca_bml_base_alloc( bml_btl,
&des,
MCA_BTL_NO_ORDER,
sizeof(mca_pml_dr_rendezvous_hdr_t),
MCA_BTL_DES_FLAGS_PRIORITY );
} else {
mca_bml_base_prepare_src( bml_btl,
NULL,
&sendreq->req_send.req_base.req_convertor,
MCA_BTL_NO_ORDER,
sizeof(mca_pml_dr_rendezvous_hdr_t),
&size,
MCA_BTL_DES_FLAGS_PRIORITY,
&des );
}
if(NULL == des) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
sendreq->req_descriptor = des; /*hang on to this for later */
segment = des->des_src;
/* build hdr */
hdr = (mca_pml_dr_hdr_t*)segment->seg_addr.pval;
hdr->hdr_common.hdr_flags = flags;
hdr->hdr_common.hdr_type = MCA_PML_DR_HDR_TYPE_RNDV;
hdr->hdr_common.hdr_dst = sendreq->req_endpoint->dst;
hdr->hdr_common.hdr_src = sendreq->req_endpoint->src;
hdr->hdr_common.hdr_ctx = sendreq->req_send.req_base.req_comm->c_contextid;
hdr->hdr_common.hdr_vid = sendreq->req_vfrag0.vf_id;
hdr->hdr_common.hdr_csum = 0;
hdr->hdr_match.hdr_tag = sendreq->req_send.req_base.req_tag;
hdr->hdr_match.hdr_seq = sendreq->req_send.req_base.req_sequence;
hdr->hdr_match.hdr_src_ptr.pval = &sendreq->req_vfrag0;
hdr->hdr_match.hdr_csum = size > 0 ? sendreq->req_send.req_base.req_convertor.checksum : OPAL_CSUM_ZERO;
hdr->hdr_rndv.hdr_msg_length = sendreq->req_send.req_bytes_packed;
hdr->hdr_common.hdr_csum = (do_csum ?
opal_csum(hdr, sizeof(mca_pml_dr_rendezvous_hdr_t)) :
OPAL_CSUM_ZERO);
/* first fragment of a long message */
des->des_flags |= MCA_BTL_DES_FLAGS_PRIORITY;
des->des_cbdata = &sendreq->req_vfrag0;
des->des_cbfunc = mca_pml_dr_rndv_completion;
/* vfrag state */
sendreq->req_vfrag0.vf_size = size;
sendreq->req_vfrag0.bml_btl = bml_btl;
sendreq->req_vfrag0.vf_state |= MCA_PML_DR_VFRAG_RNDV;
sendreq->req_vfrag0.vf_pending = 1;
/* send */
MCA_PML_DR_VFRAG_WDOG_START(&sendreq->req_vfrag0);
rc = mca_bml_base_send(bml_btl, des, MCA_BTL_TAG_PML);
if(OMPI_SUCCESS != rc) {
mca_bml_base_free(bml_btl, des );
}
return rc;
}
/**
* Schedule pipeline of send descriptors for the given request,
* using send protocol.
*/
int mca_pml_dr_send_request_schedule(mca_pml_dr_send_request_t* sendreq)
{
/*
* Only allow one thread in this routine for a given request.
* However, we cannot block callers on a mutex, so simply keep track
* of the number of times the routine has been called and run through
* the scheduling logic once for every call.
*/
mca_pml_dr_endpoint_t* endpoint = sendreq->req_endpoint;
assert(sendreq->req_vfrag0.vf_recv.pval != NULL);
if(OPAL_THREAD_ADD32(&sendreq->req_lock,1) == 1) {
do {
size_t bytes_remaining;
/*
* VFrags w/ nacks or that timed out
*/
while(opal_list_get_size(&sendreq->req_retrans) &&
sendreq->req_pipeline_depth < mca_pml_dr.send_pipeline_depth) {
mca_pml_dr_vfrag_t* vfrag;
OPAL_THREAD_LOCK(&ompi_request_lock);
vfrag = (mca_pml_dr_vfrag_t*)opal_list_get_first(&sendreq->req_retrans);
OPAL_THREAD_UNLOCK(&ompi_request_lock);
if(NULL == vfrag) {
break;
}
/*
* Retransmit fragments that have not been acked.
*/
while(vfrag->vf_idx < vfrag->vf_len &&
sendreq->req_pipeline_depth < mca_pml_dr.send_pipeline_depth) {
if(((uint64_t)1 << vfrag->vf_idx) & ~vfrag->vf_ack) {
mca_bml_base_btl_t* bml_btl = vfrag->bml_btl;
mca_pml_dr_frag_hdr_t* hdr;
mca_btl_base_descriptor_t* des;
size_t offset_in_vfrag = vfrag->vf_max_send_size * vfrag->vf_idx;
size_t offset_in_msg = vfrag->vf_offset + offset_in_vfrag;
size_t size;
int rc;
bool do_csum = mca_pml_dr.enable_csum &&
(bml_btl->btl_flags & MCA_BTL_FLAGS_NEED_CSUM);
if(vfrag->vf_idx == vfrag->vf_len - 1) {
size = vfrag->vf_size - offset_in_vfrag;
} else {
size = vfrag->vf_max_send_size;
}
/* pack into a descriptor */
opal_convertor_set_position(&sendreq->req_send.req_base.req_convertor, &offset_in_msg);
mca_bml_base_prepare_src( bml_btl,
NULL,
&sendreq->req_send.req_base.req_convertor,
MCA_BTL_NO_ORDER,
sizeof(mca_pml_dr_frag_hdr_t),
&size,
0,
&des );
if(des == NULL) {
OPAL_THREAD_LOCK(&ompi_request_lock);
opal_list_remove_item(&mca_pml_dr.send_active, (opal_list_item_t*)sendreq);
opal_list_append(&mca_pml_dr.send_pending, (opal_list_item_t*)sendreq);
OPAL_THREAD_UNLOCK(&ompi_request_lock);
break;
}
des->des_cbfunc = mca_pml_dr_frag_completion;
des->des_cbdata = vfrag;
/* setup header */
hdr = (mca_pml_dr_frag_hdr_t*)des->des_src->seg_addr.pval;
hdr->hdr_common.hdr_flags = 0;
hdr->hdr_common.hdr_csum = 0;
hdr->hdr_common.hdr_type = MCA_PML_DR_HDR_TYPE_FRAG;
hdr->hdr_common.hdr_dst = sendreq->req_endpoint->dst;
hdr->hdr_common.hdr_vid = vfrag->vf_id;
hdr->hdr_common.hdr_src = sendreq->req_endpoint->src;
hdr->hdr_common.hdr_ctx = sendreq->req_send.req_base.req_comm->c_contextid;
hdr->hdr_vlen = vfrag->vf_len;
hdr->hdr_frag_idx = vfrag->vf_idx;
hdr->hdr_frag_csum = sendreq->req_send.req_base.req_convertor.checksum;
hdr->hdr_frag_offset = offset_in_msg;
hdr->hdr_src_ptr.pval = vfrag;
hdr->hdr_dst_ptr = sendreq->req_vfrag0.vf_recv;
hdr->hdr_common.hdr_csum = (do_csum ?
opal_csum(hdr, sizeof(mca_pml_dr_frag_hdr_t)) :
OPAL_CSUM_ZERO);
/* adjust number of outstanding operations */
if(OPAL_THREAD_ADD64(&vfrag->vf_pending, 1) == 1) {
MCA_PML_DR_VFRAG_WDOG_START(vfrag);
}
OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth,1);
/* adjust send offset - may not have finished scheduling entire vfrag */
if(offset_in_msg + size > sendreq->req_send_offset) {
sendreq->req_send_offset = offset_in_msg + size;
}
/* initiate send - note that this may complete before the call returns */
rc = mca_bml_base_send( bml_btl, des, MCA_BTL_TAG_PML);
if(rc == OMPI_SUCCESS) {
bytes_remaining -= size;
} else {
OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth,-1);
mca_bml_base_free(bml_btl,des);
OPAL_THREAD_LOCK(&ompi_request_lock);
opal_list_remove_item(&mca_pml_dr.send_active, (opal_list_item_t*) sendreq);
opal_list_append(&mca_pml_dr.send_pending, (opal_list_item_t*)sendreq);
OPAL_THREAD_UNLOCK(&ompi_request_lock);
break;
}
}
vfrag->vf_idx++;
}
/* remove from retrans list */
if(vfrag->vf_idx == vfrag->vf_len) {
OPAL_THREAD_LOCK(&ompi_request_lock);
opal_list_remove_item(&sendreq->req_retrans, (opal_list_item_t*)vfrag);
vfrag->vf_state &= ~MCA_PML_DR_VFRAG_RETRANS;
OPAL_THREAD_UNLOCK(&ompi_request_lock);
}
}
/* allocate remaining bytes to BTLs */
bytes_remaining = sendreq->req_send.req_bytes_packed - sendreq->req_send_offset;
while(bytes_remaining > 0 &&
sendreq->req_pipeline_depth < mca_pml_dr.send_pipeline_depth) {
mca_pml_dr_frag_hdr_t* hdr;
mca_btl_base_descriptor_t* des;
mca_bml_base_btl_t* bml_btl = NULL;
mca_pml_dr_vfrag_t* vfrag = sendreq->req_vfrag;
size_t size = bytes_remaining;
/* offset tells us how much of the vfrag has been scheduled */
size_t bytes_sent = sendreq->req_send_offset - vfrag->vf_offset;
int rc;
bool do_csum;
/* do we need to allocate a new vfrag
(we scheduled all the vfrag already) */
if(vfrag->vf_size == bytes_sent) {
bml_btl = mca_bml_base_btl_array_get_next(&endpoint->bml_endpoint->btl_send);
MCA_PML_DR_VFRAG_ALLOC(vfrag,rc);
if(NULL == vfrag) {
OPAL_THREAD_LOCK(&mca_pml_dr.lock);
opal_list_remove_item(&mca_pml_dr.send_active, (opal_list_item_t*)sendreq);
opal_list_append(&mca_pml_dr.send_pending, (opal_list_item_t*)sendreq);
OPAL_THREAD_UNLOCK(&mca_pml_dr.lock);
break;
}
MCA_PML_DR_SEND_REQUEST_VFRAG_INIT(sendreq,endpoint,bytes_remaining,vfrag);
vfrag->bml_btl = bml_btl;
bytes_sent = 0;
} else { /* always schedule the vfrag accross the same btl */
bml_btl = vfrag->bml_btl;
}
do_csum = mca_pml_dr.enable_csum &&
(bml_btl->btl_flags & MCA_BTL_FLAGS_NEED_CSUM);
/* makes sure that we don't exceed vfrag size */
if (size > vfrag->vf_max_send_size) {
size = vfrag->vf_max_send_size;
}
if (size > vfrag->vf_size - bytes_sent) {
size = vfrag->vf_size - bytes_sent;
}
/* pack into a descriptor */
opal_convertor_set_position(&sendreq->req_send.req_base.req_convertor, &sendreq->req_send_offset);
mca_bml_base_prepare_src( bml_btl,
NULL,
&sendreq->req_send.req_base.req_convertor,
MCA_BTL_NO_ORDER,
sizeof(mca_pml_dr_frag_hdr_t),
&size,
0,
&des );
if(des == NULL) {
OPAL_THREAD_LOCK(&mca_pml_dr.lock);
opal_list_remove_item(&mca_pml_dr.send_active, (opal_list_item_t*)sendreq);
opal_list_append(&mca_pml_dr.send_pending, (opal_list_item_t*)sendreq);
OPAL_THREAD_UNLOCK(&mca_pml_dr.lock);
break;
}
des->des_cbfunc = mca_pml_dr_frag_completion;
des->des_cbdata = vfrag;
/* setup header */
hdr = (mca_pml_dr_frag_hdr_t*)des->des_src->seg_addr.pval;
hdr->hdr_common.hdr_flags = 0;
hdr->hdr_common.hdr_csum = 0;
hdr->hdr_common.hdr_type = MCA_PML_DR_HDR_TYPE_FRAG;
hdr->hdr_common.hdr_dst = sendreq->req_endpoint->dst;
hdr->hdr_common.hdr_vid = vfrag->vf_id;
hdr->hdr_common.hdr_src = sendreq->req_endpoint->src;
hdr->hdr_common.hdr_ctx = sendreq->req_send.req_base.req_comm->c_contextid;
hdr->hdr_vlen = vfrag->vf_len;
hdr->hdr_frag_idx = vfrag->vf_idx;
hdr->hdr_frag_csum = (do_csum ?
sendreq->req_send.req_base.req_convertor.checksum : OPAL_CSUM_ZERO);
hdr->hdr_frag_offset = sendreq->req_send_offset;
hdr->hdr_src_ptr.pval = vfrag;
hdr->hdr_dst_ptr = sendreq->req_vfrag0.vf_recv;
hdr->hdr_common.hdr_csum = (do_csum ?
opal_csum(hdr, sizeof(mca_pml_dr_frag_hdr_t)): OPAL_CSUM_ZERO);
assert(hdr->hdr_frag_offset < sendreq->req_send.req_bytes_packed);
/* update state */
vfrag->vf_idx++;
if(OPAL_THREAD_ADD64(&vfrag->vf_pending,1) == 1) {
MCA_PML_DR_VFRAG_WDOG_START(vfrag);
}
sendreq->req_send_offset += size;
OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth,1);
/* initiate send - note that this may complete before the call returns */
rc = mca_bml_base_send( bml_btl, des, MCA_BTL_TAG_PML);
if(rc == OMPI_SUCCESS) {
bytes_remaining -= size;
} else {
sendreq->req_send_offset -= size;
OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth,-1);
mca_bml_base_free(bml_btl,des);
OPAL_THREAD_LOCK(&ompi_request_lock);
opal_list_remove_item(&mca_pml_dr.send_active, (opal_list_item_t*)sendreq);
opal_list_append(&mca_pml_dr.send_pending, (opal_list_item_t*)sendreq);
OPAL_THREAD_UNLOCK(&ompi_request_lock);
break;
}
}
} while (OPAL_THREAD_ADD32(&sendreq->req_lock,-1) > 0);
}
return OMPI_SUCCESS;
}
/**
* Acknowledgment of match vfrag.
*/
void mca_pml_dr_send_request_match_ack(
mca_btl_base_module_t* btl,
mca_pml_dr_ack_hdr_t* ack)
{
mca_pml_dr_vfrag_t* vfrag = (mca_pml_dr_vfrag_t*)ack->hdr_src_ptr.pval;
mca_pml_dr_send_request_t* sendreq = (mca_pml_dr_send_request_t*)vfrag->vf_send.pval;
OPAL_THREAD_LOCK(&ompi_request_lock);
vfrag->vf_ack = ack->hdr_vmask & vfrag->vf_mask;
if (vfrag->vf_pending == 0) {
MCA_PML_DR_VFRAG_ACK_STOP(vfrag);
/* need to retransmit? */
if(vfrag->vf_ack != vfrag->vf_mask) {
MCA_PML_DR_VFRAG_WDOG_START(vfrag);
MCA_PML_DR_SEND_REQUEST_EAGER_RETRY(sendreq, vfrag);
} else {
/* if already have local completion free descriptor and complete message */
/* return descriptor */
if(NULL != sendreq->req_descriptor) {
if(NULL != sendreq->req_descriptor->des_context) {
mca_bml_base_free((mca_bml_base_btl_t*)sendreq->req_descriptor->des_context, sendreq->req_descriptor );
}
sendreq->req_descriptor = NULL;
}
/* update statistics */
sendreq->req_bytes_delivered = vfrag->vf_size;
MCA_PML_DR_DEBUG(1, (0, "%s:%d: inserting vid %d into sequence tracker\n",
__FILE__, __LINE__, vfrag->vf_id));
ompi_seq_tracker_insert(&sendreq->req_endpoint->seq_sends, vfrag->vf_id);
MCA_PML_DR_SEND_REQUEST_PML_COMPLETE(sendreq);
}
/* wait for local completion */
} else {
/* need to retransmit? */
if (vfrag->vf_ack != vfrag->vf_mask) {
vfrag->vf_state |= MCA_PML_DR_VFRAG_NACKED;
} else {
vfrag->vf_recv = ack->hdr_dst_ptr;
}
}
OPAL_THREAD_UNLOCK(&ompi_request_lock);
}
/**
* Acknowledgment of rendezvous vfrag.
*/
void mca_pml_dr_send_request_rndv_ack(
mca_btl_base_module_t* btl,
mca_pml_dr_ack_hdr_t* ack)
{
mca_pml_dr_vfrag_t* vfrag = (mca_pml_dr_vfrag_t*)ack->hdr_src_ptr.pval;
mca_pml_dr_send_request_t* sendreq = (mca_pml_dr_send_request_t*)vfrag->vf_send.pval;
OPAL_THREAD_LOCK(&ompi_request_lock);
/* set acked bits */
vfrag->vf_ack = ack->hdr_vmask & vfrag->vf_mask;
/* local completion? */
if (vfrag->vf_pending == 0) {
bool schedule = false;
MCA_PML_DR_VFRAG_ACK_STOP(vfrag);
/* need to retransmit? */
if(vfrag->vf_ack != vfrag->vf_mask) {
/* got a NACK, resend eager data! */
MCA_PML_DR_VFRAG_WDOG_START(vfrag);
MCA_PML_DR_SEND_REQUEST_EAGER_RETRY(sendreq, vfrag);
OPAL_THREAD_UNLOCK(&ompi_request_lock);
} else {
/* return descriptor of first fragment */
if(NULL != sendreq->req_descriptor) {
if(NULL != sendreq->req_descriptor->des_context) {
mca_bml_base_free((mca_bml_base_btl_t*)sendreq->req_descriptor->des_context, sendreq->req_descriptor);
}
sendreq->req_descriptor = NULL;
}
/* done? */
sendreq->req_send_offset = ack->hdr_vlen;
sendreq->req_bytes_delivered = ack->hdr_vlen;
if(sendreq->req_bytes_delivered == sendreq->req_send.req_bytes_packed) {
MCA_PML_DR_SEND_REQUEST_PML_COMPLETE(sendreq);
} else {
/* start scheduling with a new vfrag */
vfrag->vf_recv = ack->hdr_dst_ptr;
/* vfrag->vf_state = 0; */
/* sendreq->req_send_offset = ack->hdr_vlen; */
vfrag->vf_state = 0;
vfrag->vf_size = ack->hdr_vlen;
schedule = true;
}
/* stash the vfrag id for duplicate acks.. */
MCA_PML_DR_DEBUG(1, (0, "%s:%d: inserting vid %d into sequence tracker\n",
__FILE__, __LINE__, vfrag->vf_id));
ompi_seq_tracker_insert(&sendreq->req_endpoint->seq_sends, vfrag->vf_id);
OPAL_THREAD_UNLOCK(&ompi_request_lock);
if(schedule) {
mca_pml_dr_send_request_schedule(sendreq);
}
}
/* wait for local completion */
} else {
/* need to retransmit? */
if(vfrag->vf_ack != vfrag->vf_mask) {
vfrag->vf_state |= MCA_PML_DR_VFRAG_NACKED;
} else {
/* will need this to schedule rest of the message */
vfrag->vf_recv = ack->hdr_dst_ptr;
vfrag->vf_state = 0;
vfrag->vf_size = ack->hdr_vlen;
sendreq->req_send_offset = ack->hdr_vlen;
sendreq->req_bytes_delivered = ack->hdr_vlen;
}
OPAL_THREAD_UNLOCK(&ompi_request_lock);
}
}
/**
* Acknowledgment of vfrag.
*/
void mca_pml_dr_send_request_frag_ack(
mca_btl_base_module_t* btl,
mca_pml_dr_ack_hdr_t* ack)
{
mca_pml_dr_vfrag_t* vfrag = (mca_pml_dr_vfrag_t*)ack->hdr_src_ptr.pval;
mca_pml_dr_send_request_t* sendreq = (mca_pml_dr_send_request_t*)vfrag->vf_send.pval;
bool schedule = false;
MCA_PML_DR_VFRAG_ACK_STOP(vfrag);
OPAL_THREAD_LOCK(&ompi_request_lock);
/* add in acknowledged fragments */
vfrag->vf_ack |= (ack->hdr_vmask & vfrag->vf_mask);
/* need to retransmit? */
if(vfrag->vf_ack != vfrag->vf_mask) {
MCA_PML_DR_DEBUG(0,(0, "got a vfrag NACK, retransmitting %llx\n", (long long)~vfrag->vf_ack));
MCA_PML_DR_SEND_REQUEST_VFRAG_RETRANS(sendreq,vfrag);
schedule = true;
/* acked and local completion */
} else if (vfrag->vf_pending == 0 && vfrag->vf_idx == vfrag->vf_len) {
/* update statistics */
sendreq->req_bytes_delivered += vfrag->vf_size;
assert(sendreq->req_bytes_delivered <= sendreq->req_send.req_bytes_packed);
/* stash the vfid for duplicate acks.. */
MCA_PML_DR_DEBUG(1,(0, "%s:%d: inserting vid %d into sequence tracker\n",
__FILE__, __LINE__, vfrag->vf_id));
ompi_seq_tracker_insert(&sendreq->req_endpoint->seq_sends, vfrag->vf_id);
/* return vfrag */
MCA_PML_DR_VFRAG_RETURN(vfrag);
/* are we done with this request ? */
if(sendreq->req_bytes_delivered == sendreq->req_send.req_bytes_packed) {
MCA_PML_DR_SEND_REQUEST_PML_COMPLETE(sendreq);
/* is there something left to schedule */
} else if (sendreq->req_send_offset < sendreq->req_send.req_bytes_packed) {
schedule = true;
}
}
OPAL_THREAD_UNLOCK(&ompi_request_lock);
if(schedule) {
mca_pml_dr_send_request_schedule(sendreq);
}
}
void mca_pml_dr_sendreq_cleanup_active(mca_btl_base_module_t* btl) {
opal_list_item_t* item;
for (item = opal_list_get_first(&mca_pml_dr.send_active) ;
item != opal_list_get_end(&mca_pml_dr.send_active) ;
item = opal_list_get_next(item)) {
mca_pml_dr_send_request_t* sendreq = (mca_pml_dr_send_request_t*) item;
mca_btl_base_descriptor_t* des = sendreq->req_descriptor;
/* The des may be NULL if
* first fragment of rndv was delivered */
if (NULL != des) {
mca_bml_base_btl_t* bml_btl = (mca_bml_base_btl_t*)des->des_context;
if( bml_btl && bml_btl->btl == btl) {
des->des_context = NULL;
}
}
}
}
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