RDMA_POST_READ(3)       Librdmacm Programmer's Manual      RDMA_POST_READ(3)

NAME         top

       rdma_post_read - post an RDMA read work request.

SYNOPSIS         top

       #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         top

       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

       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

DESCRIPTION         top

       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         top

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

NOTES         top

       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

       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         top

       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)

COLOPHON         top

       This page is part of the rdma-core (RDMA Core Userspace Libraries and
       Daemons) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report
       for this manual page, send it to  This
       page was obtained from the project's upstream Git repository
       ⟨⟩ on 2019-09-26.  (At
       that time, the date of the most recent commit that was found in the
       repository was 2019-09-25.)  If you discover any rendering problems
       in this HTML version of the page, or you believe there is a better or
       more up-to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not part
       of the original manual page), send a mail to

librdmacm                        2010-07-19                RDMA_POST_READ(3)

Pages that refer to this page: rdma_get_recv_comp(3)rdma_get_send_comp(3)rdma_post_readv(3)rdma_reg_msgs(3)rdma_reg_read(3)rdma_cm(7)