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rpma_recv(3) RPMA Programmer's Manual rpma_recv(3)


rpma_recv - initiate the receive operation


      #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);


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_conn_completion_get(3).

The attribute flags set the completion notification indicator:

  • RPMA_F_COMPLETION_ON_ERROR - generate the completion on error
  • RPMA_F_COMPLETION_ALWAYS - generate the completion regardless of result of the operation


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


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


rpma_recv() can fail with the following errors:
  • RPMA_E_INVAL - conn or src is NULL
  • RPMA_E_PROVIDER - ibv_post_recv(3) failed


rpma_conn_req_connect(3), rpma_mr_reg(3), librpma(7) and
21 October 2020 RPMA