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)