/* * Copyright (c) 2004-2005 The Trustees of Indiana University. * All rights reserved. * Copyright (c) 2004-2005 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 #include #include "include/types.h" #include "mca/pml/base/pml_base_sendreq.h" #include "mca/ns/base/base.h" #include "mca/oob/base/base.h" #include "mca/rml/rml.h" #include "mca/errmgr/errmgr.h" #include "dps/dps.h" #include "btl_openib.h" #include "btl_openib_endpoint.h" #include "btl_openib_proc.h" #include "btl_openib_frag.h" #include "class/ompi_free_list.h" #include #include extern int errno; static void mca_btl_openib_endpoint_construct(mca_btl_base_endpoint_t* endpoint); static void mca_btl_openib_endpoint_destruct(mca_btl_base_endpoint_t* endpoint); int mca_btl_openib_endpoint_create_qp( mca_btl_openib_module_t* openib_btl, struct ibv_pd* pd, struct ibv_cq* cq, struct ibv_qp_attr* qp_attr, struct ibv_qp** qp ); int mca_btl_openib_endpoint_qp_init_query( mca_btl_openib_module_t* openib_btl, struct ibv_qp* qp, struct ibv_qp_attr* attr, uint32_t lcl_psn, uint32_t rem_qp_num, uint32_t rem_psn, uint16_t rem_lid, uint32_t port_num ); static inline int mca_btl_openib_endpoint_post_send(mca_btl_openib_module_t* openib_btl, mca_btl_openib_endpoint_t * endpoint, mca_btl_openib_frag_t * frag) { struct ibv_qp* ib_qp; struct ibv_send_wr* bad_wr; frag->sg_entry.addr = (uintptr_t) frag->hdr; if(frag->base.des_flags && MCA_BTL_DES_FLAGS_PRIORITY && frag->size <= openib_btl->super.btl_eager_limit){ ib_qp = endpoint->lcl_qp_high; } else { ib_qp = endpoint->lcl_qp_low; } frag->sr_desc.opcode = IBV_WR_SEND; frag->sr_desc.send_flags = IBV_SEND_SIGNALED; frag->sg_entry.length = frag->segment.seg_len + ((unsigned char*) frag->segment.seg_addr.pval - (unsigned char*) frag->hdr); /* sizeof(mca_btl_openib_header_t); */ /* TODO: should check if we can inline send,, but can't find * inline send defined in openib verbs api. * if(frag->sg_entry.len <= openib_btl->ib_inline_max) { */ if(ibv_post_send(ib_qp, &frag->sr_desc, &bad_wr)) { opal_output(0, "%s: error posting send request errno says %s\n", __func__, strerror(errno)); return OMPI_ERROR; } mca_btl_openib_endpoint_post_rr(endpoint, 1); return OMPI_ERROR; } OBJ_CLASS_INSTANCE(mca_btl_openib_endpoint_t, opal_list_item_t, mca_btl_openib_endpoint_construct, mca_btl_openib_endpoint_destruct); /* * Initialize state of the endpoint instance. * */ static void mca_btl_openib_endpoint_construct(mca_btl_base_endpoint_t* endpoint) { endpoint->endpoint_btl = 0; endpoint->endpoint_proc = 0; endpoint->endpoint_tstamp = 0.0; endpoint->endpoint_state = MCA_BTL_IB_CLOSED; endpoint->endpoint_retries = 0; OBJ_CONSTRUCT(&endpoint->endpoint_send_lock, opal_mutex_t); OBJ_CONSTRUCT(&endpoint->endpoint_recv_lock, opal_mutex_t); OBJ_CONSTRUCT(&endpoint->pending_send_frags, opal_list_t); } /* * Destroy a endpoint * */ static void mca_btl_openib_endpoint_destruct(mca_btl_base_endpoint_t* endpoint) { } /* * Send connection information to remote endpoint using OOB * */ static void mca_btl_openib_endpoint_send_cb( int status, orte_process_name_t* endpoint, orte_buffer_t* buffer, orte_rml_tag_t tag, void* cbdata) { OBJ_RELEASE(buffer); } static int mca_btl_openib_endpoint_send_connect_req(mca_btl_base_endpoint_t* endpoint) { orte_buffer_t* buffer = OBJ_NEW(orte_buffer_t); int rc; if(NULL == buffer) { ORTE_ERROR_LOG(ORTE_ERR_OUT_OF_RESOURCE); return ORTE_ERR_OUT_OF_RESOURCE; } /* pack the info in the send buffer */ rc = orte_dps.pack(buffer, &endpoint->lcl_qp_high->qp_num, 1, ORTE_UINT32); if(rc != ORTE_SUCCESS) { ORTE_ERROR_LOG(rc); return rc; } rc = orte_dps.pack(buffer, &endpoint->lcl_qp_low->qp_num, 1, ORTE_UINT32); if(rc != ORTE_SUCCESS) { ORTE_ERROR_LOG(rc); return rc; } rc = orte_dps.pack(buffer, &endpoint->lcl_psn_high, 1, ORTE_UINT32); if(rc != ORTE_SUCCESS) { ORTE_ERROR_LOG(rc); return rc; } rc = orte_dps.pack(buffer, &endpoint->lcl_psn_low, 1, ORTE_UINT32); if(rc != ORTE_SUCCESS) { ORTE_ERROR_LOG(rc); return rc; } rc = orte_dps.pack(buffer, &endpoint->endpoint_btl->ib_port_attr->lid, 1, ORTE_UINT16); if(rc != ORTE_SUCCESS) { ORTE_ERROR_LOG(rc); return rc; } /* send to endpoint */ rc = orte_rml.send_buffer_nb(&endpoint->endpoint_proc->proc_guid, buffer, ORTE_RML_TAG_DYNAMIC-1, 0, mca_btl_openib_endpoint_send_cb, NULL); DEBUG_OUT("Sending High Priority QP num = %d, Low Priority QP num = %d, LID = %d", endpoint->lcl_qp_prop_high.qp_num, endpoint->lcl_qp_prop_low.qp_num, endpoint->endpoint_btl->port.lid); if(rc < 0) { ORTE_ERROR_LOG(rc); return rc; } return OMPI_SUCCESS; } /* * Send connect ACK to remote endpoint * */ static int mca_btl_openib_endpoint_send_connect_ack(mca_btl_base_endpoint_t* endpoint) { orte_buffer_t* buffer = OBJ_NEW(orte_buffer_t); int rc; uint32_t zero = 0; /* pack the info in the send buffer */ if(ORTE_SUCCESS != (rc = orte_dps.pack(buffer, &zero, 1, ORTE_UINT32))) { ORTE_ERROR_LOG(rc); return rc; } if(ORTE_SUCCESS != (rc = orte_dps.pack(buffer, &zero, 1, ORTE_UINT32))) { ORTE_ERROR_LOG(rc); return rc; } if(ORTE_SUCCESS != (rc = orte_dps.pack(buffer, &zero, 1, ORTE_UINT32))) { ORTE_ERROR_LOG(rc); return rc; } if(ORTE_SUCCESS != (rc = orte_dps.pack(buffer, &zero, 1, ORTE_UINT32))) { ORTE_ERROR_LOG(rc); return rc; } if(ORTE_SUCCESS != (rc = orte_dps.pack(buffer, &zero, 1, ORTE_UINT16))) { ORTE_ERROR_LOG(rc); return rc; } /* send to endpoint */ rc = orte_rml.send_buffer_nb(&endpoint->endpoint_proc->proc_guid, buffer, ORTE_RML_TAG_DYNAMIC-1, 0, mca_btl_openib_endpoint_send_cb, NULL); if(rc < 0) { ORTE_ERROR_LOG(rc); } return rc; } /* * Set remote connection info * * XXX: Currently size is unutilized, this shall change * as soon as we add more info to be exchanged at connection * setup. * */ static int mca_btl_openib_endpoint_set_remote_info(mca_btl_base_endpoint_t* endpoint, orte_buffer_t* buffer) { int rc; size_t cnt = 1; rc = orte_dps.unpack(buffer, &endpoint->rem_qp_num_high, &cnt, ORTE_UINT32); if(ORTE_SUCCESS != rc) { ORTE_ERROR_LOG(rc); return rc; } rc = orte_dps.unpack(buffer, &endpoint->rem_qp_num_low, &cnt, ORTE_UINT32); if(ORTE_SUCCESS != rc) { ORTE_ERROR_LOG(rc); return rc; } rc = orte_dps.unpack(buffer, &endpoint->rem_psn_high, &cnt, ORTE_UINT32); if(ORTE_SUCCESS != rc) { ORTE_ERROR_LOG(rc); return rc; } rc = orte_dps.unpack(buffer, &endpoint->rem_psn_low, &cnt, ORTE_UINT32); if(ORTE_SUCCESS != rc) { ORTE_ERROR_LOG(rc); return rc; } rc = orte_dps.unpack(buffer, &endpoint->rem_lid, &cnt, ORTE_UINT16); if(ORTE_SUCCESS != rc) { ORTE_ERROR_LOG(rc); return rc; } DEBUG_OUT("Received High Priority QP num = %d, Low Priority QP num %d, LID = %d", endpoint->rem_qp_num_high, endpoint->rem_qp_num_low, endpoint->rem_lid); return ORTE_SUCCESS; } /* * Start to connect to the endpoint. We send our Queue Pair * information over the TCP OOB communication mechanism. * On completion of our send, a send completion handler * is called. * */ static int mca_btl_openib_endpoint_start_connect(mca_btl_base_endpoint_t* endpoint) { int rc; mca_btl_openib_module_t* openib_btl = (mca_btl_openib_module_t*) endpoint->endpoint_btl; /* Create the High Priority Queue Pair */ if(OMPI_SUCCESS != (rc = mca_btl_openib_endpoint_create_qp(openib_btl, openib_btl->ib_pd, openib_btl->ib_cq_high, endpoint->lcl_qp_attr_high, &endpoint->lcl_qp_high))) { opal_output(0, "[%lu,%lu,%lu] %s:%d errcode %d\n", ORTE_NAME_ARGS(orte_process_info.my_name), __FILE__,__LINE__,rc); return rc; } endpoint->lcl_psn_high = lrand48() & 0xffffff; /* Create the Low Priority Queue Pair */ if(OMPI_SUCCESS != (rc = mca_btl_openib_endpoint_create_qp(openib_btl, openib_btl->ib_pd, openib_btl->ib_cq_low, endpoint->lcl_qp_attr_low, &endpoint->lcl_qp_low))) { opal_output(0, "[%lu,%lu,%lu] %s:%d errcode %d\n", ORTE_NAME_ARGS(orte_process_info.my_name), __FILE__,__LINE__,rc); return rc; } endpoint->lcl_psn_low = lrand48() & 0xffffff; DEBUG_OUT("Initialized High Priority QP num = %d, Low Priority QP num = %d, LID = %d", endpoint->lcl_qp_high->qp_num, endpoint->lcl_qp_low.qp_num, openib_btl->ib_port_attr->lid); /* Send connection info over to remote endpoint */ endpoint->endpoint_state = MCA_BTL_IB_CONNECTING; if(OMPI_SUCCESS != (rc = mca_btl_openib_endpoint_send_connect_req(endpoint))) { opal_output(0, "[%lu,%lu,%lu] %s:%d errcode %d\n", ORTE_NAME_ARGS(orte_process_info.my_name), __FILE__,__LINE__,rc); return rc; } return OMPI_SUCCESS; } /* * Reply to a `start - connect' message * */ static int mca_btl_openib_endpoint_reply_start_connect(mca_btl_openib_endpoint_t *endpoint, orte_buffer_t* buffer) { int rc; mca_btl_openib_module_t* openib_btl = (mca_btl_openib_module_t*) endpoint->endpoint_btl; /* Create the High Priority Queue Pair */ if(OMPI_SUCCESS != (rc = mca_btl_openib_endpoint_create_qp(openib_btl, openib_btl->ib_pd, openib_btl->ib_cq_high, endpoint->lcl_qp_attr_high, &endpoint->lcl_qp_high))) { opal_output(0, "[%lu,%lu,%lu] %s:%d errcode %d\n", ORTE_NAME_ARGS(orte_process_info.my_name), __FILE__,__LINE__,rc); return rc; } endpoint->lcl_psn_high = lrand48() & 0xffffff; /* Create the Low Priority Queue Pair */ if(OMPI_SUCCESS != (rc = mca_btl_openib_endpoint_create_qp(openib_btl, openib_btl->ib_pd, openib_btl->ib_cq_low, endpoint->lcl_qp_attr_low, &endpoint->lcl_qp_low))) { opal_output(0, "[%lu,%lu,%lu] %s:%d errcode %d\n", ORTE_NAME_ARGS(orte_process_info.my_name), __FILE__,__LINE__,rc); return rc; } endpoint->lcl_psn_low = lrand48() & 0xffffff; DEBUG_OUT("Initialized High Priority QP num = %d, Low Priority QP num = %d, LID = %d", endpoint->lcl_qp_high->qp_num, endpoint->lcl_qp_low.qp_num, openib_btl->ib_port_attr->lid); /* Set the remote side info */ mca_btl_openib_endpoint_set_remote_info(endpoint, buffer); /* Connect to endpoint */ rc = mca_btl_openib_endpoint_connect(endpoint); if(rc != OMPI_SUCCESS) { opal_output(0, "[%lu,%lu,%lu] %s:%d errcode %d\n", ORTE_NAME_ARGS(orte_process_info.my_name), __FILE__,__LINE__,rc); return rc; } /* Send connection info over to remote endpoint */ if(OMPI_SUCCESS != (rc = mca_btl_openib_endpoint_send_connect_req(endpoint))) { opal_output(0, "[%lu,%lu,%lu] %s:%d errcode %d\n", ORTE_NAME_ARGS(orte_process_info.my_name), __FILE__,__LINE__,rc); return rc; } return OMPI_SUCCESS; } /* * */ static void mca_btl_openib_endpoint_connected(mca_btl_openib_endpoint_t *endpoint) { endpoint->endpoint_state = MCA_BTL_IB_CONNECTED; mca_btl_openib_progress_send_frags(endpoint); } /* * Non blocking OOB recv callback. * Read incoming QP and other info, and if this endpoint * is trying to connect, reply with our QP info, * otherwise try to modify QP's and establish * reliable connection * */ static void mca_btl_openib_endpoint_recv( int status, orte_process_name_t* endpoint, orte_buffer_t* buffer, orte_rml_tag_t tag, void* cbdata) { mca_btl_openib_proc_t *ib_proc; mca_btl_openib_endpoint_t *ib_endpoint; int endpoint_state; int rc; for(ib_proc = (mca_btl_openib_proc_t*) opal_list_get_first(&mca_btl_openib_component.ib_procs); ib_proc != (mca_btl_openib_proc_t*) opal_list_get_end(&mca_btl_openib_component.ib_procs); ib_proc = (mca_btl_openib_proc_t*)opal_list_get_next(ib_proc)) { if(ib_proc->proc_guid.vpid == endpoint->vpid) { /* Try to get the endpoint instance of this proc */ /* Limitation: Right now, we have only 1 endpoint * for every process. Need several changes, some * in PML/BTL interface to set this right */ ib_endpoint = ib_proc->proc_endpoints[0]; endpoint_state = ib_endpoint->endpoint_state; /* Update status */ switch(endpoint_state) { case MCA_BTL_IB_CLOSED : /* We had this connection closed before. * The endpoint is trying to connect. Move the * status of this connection to CONNECTING, * and then reply with our QP information */ if(OMPI_SUCCESS != (rc = mca_btl_openib_endpoint_reply_start_connect(ib_endpoint, buffer))) { opal_output(0, "[%lu,%lu,%lu] %s:%d errcode %d\n", ORTE_NAME_ARGS(orte_process_info.my_name), __FILE__,__LINE__,rc); break; } /* Setup state as connected */ ib_endpoint->endpoint_state = MCA_BTL_IB_CONNECT_ACK; break; case MCA_BTL_IB_CONNECTING : mca_btl_openib_endpoint_set_remote_info(ib_endpoint, buffer); if(OMPI_SUCCESS != (rc = mca_btl_openib_endpoint_connect(ib_endpoint))) { opal_output(0, "[%lu,%lu,%lu] %s:%d errcode %d\n", ORTE_NAME_ARGS(orte_process_info.my_name), __FILE__,__LINE__,rc); break; } /* Setup state as connected */ mca_btl_openib_endpoint_connected(ib_endpoint); /* Send him an ack */ mca_btl_openib_endpoint_send_connect_ack(ib_endpoint); break; case MCA_BTL_IB_CONNECT_ACK: mca_btl_openib_endpoint_connected(ib_endpoint); break; case MCA_BTL_IB_CONNECTED : break; default : opal_output(0, "Connected -> Connecting not possible.\n"); } break; } } /* Okay, now that we are done receiving, * re-post the buffer */ mca_btl_openib_post_recv(); } void mca_btl_openib_post_recv() { orte_rml.recv_buffer_nb( ORTE_RML_NAME_ANY, ORTE_RML_TAG_DYNAMIC-1, 0, mca_btl_openib_endpoint_recv, NULL); } /* * Attempt to send a fragment using a given endpoint. If the endpoint is not * connected, queue the fragment and start the connection as required. */ int mca_btl_openib_endpoint_send( mca_btl_base_endpoint_t* endpoint, mca_btl_openib_frag_t* frag ) { int rc; mca_btl_openib_module_t *openib_btl; OPAL_THREAD_LOCK(&endpoint->endpoint_send_lock); switch(endpoint->endpoint_state) { case MCA_BTL_IB_CONNECTING: DEBUG_OUT("Queing because state is connecting"); opal_list_append(&endpoint->pending_send_frags, (opal_list_item_t *)frag); rc = OMPI_SUCCESS; break; case MCA_BTL_IB_CONNECT_ACK: DEBUG_OUT("Queuing because waiting for ack"); opal_list_append(&endpoint->pending_send_frags, (opal_list_item_t *)frag); rc = OMPI_SUCCESS; break; case MCA_BTL_IB_CLOSED: DEBUG_OUT("Connection to endpoint closed ... connecting ..."); opal_list_append(&endpoint->pending_send_frags, (opal_list_item_t *)frag); rc = mca_btl_openib_endpoint_start_connect(endpoint); break; case MCA_BTL_IB_FAILED: rc = OMPI_ERR_UNREACH; break; case MCA_BTL_IB_CONNECTED: { openib_btl = endpoint->endpoint_btl; DEBUG_OUT("Send to : %d, len : %d, frag : %p", endpoint->endpoint_proc->proc_guid.vpid, frag->ib_buf.desc.sg_entry.len, frag); rc = mca_btl_openib_endpoint_post_send(openib_btl, endpoint, frag); break; } default: rc = OMPI_ERR_UNREACH; } OPAL_THREAD_UNLOCK(&endpoint->endpoint_send_lock); return rc; } void mca_btl_openib_progress_send_frags(mca_btl_openib_endpoint_t* endpoint) { opal_list_item_t *frag_item; mca_btl_openib_frag_t *frag; mca_btl_openib_module_t* openib_btl; /*Check if endpoint is connected */ if(endpoint->endpoint_state != MCA_BTL_IB_CONNECTED) { return; } /* While there are frags in the list, * process them */ while(!opal_list_is_empty(&(endpoint->pending_send_frags))) { frag_item = opal_list_remove_first(&(endpoint->pending_send_frags)); frag = (mca_btl_openib_frag_t *) frag_item; openib_btl = endpoint->endpoint_btl; /* We need to post this one */ if(OMPI_SUCCESS != mca_btl_openib_endpoint_post_send(openib_btl, endpoint, frag)) opal_output(0, "error in mca_btl_openib_endpoint_send"); } } /* * Complete connection to endpoint. */ int mca_btl_openib_endpoint_connect( mca_btl_openib_endpoint_t *endpoint) { int rc; mca_btl_openib_module_t* openib_btl = (mca_btl_openib_module_t*) endpoint->endpoint_btl; /* Connection establishment RC */ rc = mca_btl_openib_endpoint_qp_init_query( openib_btl, endpoint->lcl_qp_high, endpoint->lcl_qp_attr_high, endpoint->lcl_psn_high, endpoint->rem_qp_num_high, endpoint->rem_psn_high, endpoint->rem_lid, openib_btl->port_num ); if(rc != OMPI_SUCCESS) { return rc; } rc = mca_btl_openib_endpoint_qp_init_query( openib_btl, endpoint->lcl_qp_low, endpoint->lcl_qp_attr_low, endpoint->lcl_psn_low, endpoint->rem_qp_num_low, endpoint->rem_psn_low, endpoint->rem_lid, openib_btl->port_num ); if(rc != OMPI_SUCCESS) { return rc; } mca_btl_openib_endpoint_post_rr(endpoint, 0); return OMPI_SUCCESS; } int mca_btl_openib_endpoint_create_qp( mca_btl_openib_module_t* openib_btl, struct ibv_pd* pd, struct ibv_cq* cq, struct ibv_qp_attr* qp_attr, struct ibv_qp** qp ) { { struct ibv_qp_init_attr qp_init_attr; qp_init_attr.send_cq = cq; qp_init_attr.recv_cq = cq; qp_init_attr.cap.max_send_wr = mca_btl_openib_component.ib_wq_size; qp_init_attr.cap.max_recv_wr = mca_btl_openib_component.ib_wq_size; qp_init_attr.cap.max_send_sge = mca_btl_openib_component.ib_sg_list_size; qp_init_attr.cap.max_recv_sge = mca_btl_openib_component.ib_sg_list_size; qp_init_attr.qp_type = IBV_QPT_RC; (*qp) = ibv_create_qp(pd, &qp_init_attr); if(NULL == (*qp)) { opal_output(0, "%s: error creating qp errno says %s\n", __func__, strerror(errno)); return OMPI_ERROR; } openib_btl->ib_inline_max = qp_init_attr.cap.max_inline_data; } { qp_attr->qp_state = IBV_QPS_INIT; qp_attr->pkey_index = mca_btl_openib_component.ib_pkey_ix; qp_attr->port_num = openib_btl->port_num; qp_attr->qp_access_flags = 0; if(ibv_modify_qp((*qp), qp_attr, IBV_QP_STATE | IBV_QP_PKEY_INDEX | IBV_QP_PORT | IBV_QP_ACCESS_FLAGS )) { opal_output(0, "%s: error modifying qp to INIT errno says %s\n", __func__, strerror(errno)); return OMPI_ERROR; } } return OMPI_SUCCESS; } int mca_btl_openib_endpoint_qp_init_query( mca_btl_openib_module_t* openib_btl, struct ibv_qp* qp, struct ibv_qp_attr* attr, uint32_t lcl_psn, uint32_t rem_qp_num, uint32_t rem_psn, uint16_t rem_lid, uint32_t port_num ) { attr->qp_state = IBV_QPS_RTR; attr->path_mtu = mca_btl_openib_component.ib_mtu; attr->dest_qp_num = rem_qp_num; attr->rq_psn = rem_psn; attr->max_dest_rd_atomic = mca_btl_openib_component.ib_max_rdma_dst_ops; attr->min_rnr_timer = mca_btl_openib_component.ib_min_rnr_timer; attr->ah_attr.is_global = 0; attr->ah_attr.dlid = rem_lid; attr->ah_attr.sl = mca_btl_openib_component.ib_service_level; attr->ah_attr.src_path_bits = mca_btl_openib_component.ib_src_path_bits; attr->ah_attr.port_num = port_num; if(ibv_modify_qp(qp, attr, IBV_QP_STATE | IBV_QP_AV | IBV_QP_PATH_MTU | IBV_QP_DEST_QPN | IBV_QP_RQ_PSN | IBV_QP_MAX_DEST_RD_ATOMIC | IBV_QP_MIN_RNR_TIMER)) { opal_output(0, "%s: error modifing QP to RTR errno says %s\n", __func__, strerror(errno)); return OMPI_ERROR; } attr->qp_state = IBV_QPS_RTS; attr->timeout = mca_btl_openib_component.ib_timeout; attr->retry_cnt = mca_btl_openib_component.ib_retry_count; attr->rnr_retry = mca_btl_openib_component.ib_rnr_retry; attr->sq_psn = lcl_psn; attr->max_rd_atomic = mca_btl_openib_component.ib_max_rdma_dst_ops; if (ibv_modify_qp(qp, attr, IBV_QP_STATE | IBV_QP_TIMEOUT | IBV_QP_RETRY_CNT | IBV_QP_RNR_RETRY | IBV_QP_SQ_PSN | IBV_QP_MAX_QP_RD_ATOMIC)) { opal_output(0, "%s: error modifying QP to RTS errno says %s\n", __func__, strerror(errno)); return OMPI_ERROR; } return OMPI_SUCCESS; }