NAME

       rdma_post_read - post an RDMA read work request.

SYNOPSIS

       #include <rdma/rdma_verbs.h>

       int  rdma_post_read  (struct  rdma_cm_id  *id,  void  *context, void *addr, size_t length,
       struct ibv_mr *mr, int flags, uint64_t remote_addr, uint32_t rkey);

ARGUMENTS

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

       context     User-defined context associated with the request.

       addr        The address of the local destination of the read request.

       length      The length of the read operation.

       mr          Registered memory region associated with the local buffer.

       flags       Optional flags used to control the read operation.

       remote_addr The address of the remote registered memory to read from.

       rkey        The registered memory key associated with the remote address.

DESCRIPTION

       Posts a work request to the send queue of the queue pair associated with  the  rdma_cm_id.
       The contents of the remote memory region will be read into the local data buffer.

RETURN VALUE

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

NOTES

       For a list of supported flags, see ibv_post_send.  Both the remote and local data  buffers
       must  have  been  registered  before  the  read  is  issued,  and  the buffers must remain
       registered until the read completes.

       Read operations may not be posted to an rdma_cm_id or the corresponding queue  pair  until
       it has been connected.

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

SEE ALSO

       rdma_cm(7),   rdma_connect(3),   rdma_accept(3),   ibv_post_send(3),   rdma_post_readv(3),
       rdma_reg_read(3), rdma_reg_msgs(3)