NAME

       rdma_post_recv - post a work request to receive an incoming message.

SYNOPSIS

       #include <rdma/rdma_verbs.h>

       int rdma_post_recv (struct rdma_cm_id *id, void *context, void *addr, size_t length, struct ibv_mr *mr);

ARGUMENTS

       id          A reference to a communication identifier where the message buffer will be posted.

       context     User-defined context associated with the request.

       addr        The address of the memory buffer to post.

       length      The length of the memory buffer.

       mr          A registered memory region associated with the posted buffer.

DESCRIPTION

       Posts  a  work request to the receive queue of the queue pair associated with the rdma_cm_id.  The posted
       buffer will be queued to receive an incoming message sent by the remote peer.

RETURN VALUE

       Returns 0 on success, or -1 on error.  If an error occurs, errno will be  set  to  indicate  the  failure
       reason.

NOTES

       The user is responsible for ensuring that a receive buffer is posted and large enough to contain all sent
       data before the peer posts the corresponding send message.  The message buffer must have been  registered
       before  being  posted,  with  the  mr  parameter  referencing  the  registration.  The buffer must remain
       registered until the receive completes.

       Messages may be posted to an rdma_cm_id only after a queue pair has been associated  with  it.   A  queue
       pair  is  bound  to  an  rdma_cm_id  after calling rdma_create_ep or rdma_create_qp, if the rdma_cm_id is
       allocated using rdma_create_id.

       The user-defined context associated with the receive request will be returned to  the  user  through  the
       work completion wr_id, work request identifier, field.

SEE ALSO

       rdma_cm(7),  rdma_create_id(3),  rdma_create_ep(3),  rdma_create_qp(3),  rdma_reg_read(3), ibv_reg_mr(3),
       ibv_dereg_mr(3), rdma_post_recvv(3), rdma_post_send(3)