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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2012 Sandia National Laboratories. All rights reserved.
* Copyright (c) 2014-2018 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2020 IBM Corporation. All rights reserved.
* Copyright (c) 2021 Google, LLC. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#ifndef OSC_RDMA_FRAG_H
#define OSC_RDMA_FRAG_H
#include "osc_rdma.h"
#include "opal/align.h"
static inline void ompi_osc_rdma_frag_complete (ompi_osc_rdma_frag_t *frag)
{
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_INFO, "returning frag. pending = %d", frag->pending);
if (0 == OPAL_THREAD_ADD_FETCH32(&frag->pending, -1)) {
opal_atomic_rmb ();
(void) opal_atomic_swap_32 (&frag->pending, 1);
(void) opal_atomic_swap_64 (&frag->curr_index, 0);
}
}
/*
* Note: module lock must be held during this operation
*/
static inline int ompi_osc_rdma_frag_alloc (ompi_osc_rdma_module_t *module, size_t request_len,
ompi_osc_rdma_frag_t **buffer, char **ptr)
{
ompi_osc_rdma_frag_t *curr = module->rdma_frag;
int64_t my_index;
int ret;
/* ensure all buffers are 8-byte aligned */
request_len = OPAL_ALIGN(request_len, 8, size_t);
if (request_len > (mca_osc_rdma_component.buffer_size >> 1)) {
return OMPI_ERR_VALUE_OUT_OF_BOUNDS;
}
if (NULL == curr) {
opal_free_list_item_t *item = NULL;
void *_tmp_ptr = NULL;
item = opal_free_list_get (&mca_osc_rdma_component.frags);
if (OPAL_UNLIKELY(NULL == item)) {
OPAL_THREAD_UNLOCK(&module->lock);
return OMPI_ERR_OUT_OF_RESOURCE;
}
curr = (ompi_osc_rdma_frag_t *) item;
curr->handle = NULL;
curr->pending = 1;
curr->module = module;
curr->curr_index = 0;
if (module->use_memory_registration) {
ret = ompi_osc_rdma_register (module, MCA_BTL_ENDPOINT_ANY, curr->super.ptr, mca_osc_rdma_component.buffer_size,
MCA_BTL_REG_FLAG_ACCESS_ANY, &curr->handle);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
}
if (!opal_atomic_compare_exchange_strong_ptr ((opal_atomic_intptr_t *) &module->rdma_frag, (intptr_t *) &_tmp_ptr, (intptr_t) curr)) {
ompi_osc_rdma_deregister (module, curr->handle);
curr->handle = NULL;
opal_free_list_return (&mca_osc_rdma_component.frags, &curr->super);
curr = module->rdma_frag;
}
}
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_INFO, "allocating frag. pending = %d", curr->pending);
OPAL_THREAD_ADD_FETCH32(&curr->pending, 1);
my_index = opal_atomic_fetch_add_64 (&curr->curr_index, request_len);
if (my_index + request_len > mca_osc_rdma_component.buffer_size) {
if (my_index <= mca_osc_rdma_component.buffer_size) {
/* this thread caused the buffer to spill over */
ompi_osc_rdma_frag_complete (curr);
}
ompi_osc_rdma_frag_complete (curr);
return OPAL_ERR_OUT_OF_RESOURCE;
}
*ptr = (void *) ((intptr_t) curr->super.ptr + my_index);
*buffer = curr;
return OMPI_SUCCESS;
}
#endif
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