bionic (3) rdma_post_readv.3.gz

NAME

       rdma_post_readv - post an RDMA read work request.

SYNOPSIS

       #include <rdma/rdma_verbs.h>

       int  rdma_post_readv  (struct  rdma_cm_id  *id,  void *context, struct ibv_sge *sgl, int nsge, 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.

       sgl         A scatter-gather list of the destination buffers of the read.

       nsge        The number of scatter-gather array entries.

       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 buffers.

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_read(3),  rdma_reg_read(3),
       rdma_reg_msgs(3)