librpma.7 rpma_atomic_write.3 rpma_conn_apply_remote_peer_cfg.3 rpma_conn_cfg_delete.3 rpma_conn_cfg_get_cq_size.3 rpma_conn_cfg_get_rcq_size.3 rpma_conn_cfg_get_rq_size.3 rpma_conn_cfg_get_sq_size.3 rpma_conn_cfg_get_timeout.3 rpma_conn_cfg_new.3 rpma_conn_cfg_set_cq_size.3 rpma_conn_cfg_set_rcq_size.3 rpma_conn_cfg_set_rq_size.3 rpma_conn_cfg_set_sq_size.3 rpma_conn_cfg_set_timeout.3 rpma_conn_delete.3 rpma_conn_disconnect.3 rpma_conn_get_cq.3 rpma_conn_get_event_fd.3 rpma_conn_get_private_data.3 rpma_conn_get_qp_num.3 rpma_conn_get_rcq.3 rpma_conn_next_event.3 rpma_conn_req_connect.3 rpma_conn_req_delete.3 rpma_conn_req_get_private_data.3 rpma_conn_req_new.3 rpma_conn_req_recv.3 rpma_cq_get_fd.3 rpma_cq_get_wc.3 rpma_cq_wait.3 rpma_ep_get_fd.3 rpma_ep_listen.3 rpma_ep_next_conn_req.3 rpma_ep_shutdown.3 rpma_err_2str.3 rpma_flush.3 rpma_log_get_threshold.3 rpma_log_set_function.3 rpma_log_set_threshold.3 rpma_mr_advise.3 rpma_mr_dereg.3 rpma_mr_get_descriptor.3 rpma_mr_get_descriptor_size.3 rpma_mr_get_ptr.3 rpma_mr_get_size.3 rpma_mr_reg.3 rpma_mr_remote_delete.3 rpma_mr_remote_from_descriptor.3 rpma_mr_remote_get_flush_type.3 rpma_mr_remote_get_size.3 rpma_peer_cfg_delete.3 rpma_peer_cfg_from_descriptor.3 rpma_peer_cfg_get_descriptor.3 rpma_peer_cfg_get_descriptor_size.3 rpma_peer_cfg_get_direct_write_to_pmem.3 rpma_peer_cfg_new.3 rpma_peer_cfg_set_direct_write_to_pmem.3 rpma_peer_delete.3 rpma_peer_new.3 rpma_read.3 rpma_recv.3 rpma_send.3 rpma_send_with_imm.3 rpma_utils_conn_event_2str.3 rpma_utils_get_ibv_context.3 rpma_utils_ibv_context_is_odp_capable.3 rpma_write.3 rpma_write_atomic.3 rpma_write_with_imm.3

NAME

rpma_recv - initiate the receive operation

SYNOPSIS

      #include <librpma.h>

      struct rpma_conn;
      struct rpma_mr_local;
      int rpma_recv(struct rpma_conn *conn,
                      struct rpma_mr_local *dst, size_t offset,
                      size_t len, const void *op_context);

DESCRIPTION

rpma_recv() initiates the receive operation which prepares a buffer for a message sent from other side of the connection. Please see rpma_send(3).

All buffers prepared via rpma_recv(3) form an unordered set. When a message arrives it is placed in one of the buffers awaitaning and a completion for the receive operation is generated.

A buffer for an incoming message have to be prepared beforehand.

The order of buffers in the set does not affect the order of completions of receive operations get via rpma_cq_get_wc(3).

op_context is returned in the wr_id field of the completion (struct ibv_wc).

NOTE

In the RDMA standard, receive requests form an ordered queue. The RPMA does NOT inherit this guarantee.

RETURN VALUE

The rpma_recv() function returns 0 on success or a negative error code on failure.

ERRORS

rpma_recv() can fail with the following errors:

RPMA_E_INVAL - conn == NULL
RPMA_E_INVAL - dst == NULL && (offset != 0 || len != 0)
RPMA_E_PROVIDER - ibv_post_recv(3) failed