rdma_reg_write(3) [centos man page]

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

NAME

       rdma_reg_write - register data buffer(s) for remote RDMA write access.

SYNOPSIS

       #include <rdma/rdma_verbs.h>

       struct ibv_mr * rdma_reg_write (struct rdma_cm_id *id, void *addr, size_t length);

ARGUMENTS

       id	   A reference to a communication identifier where the message buffer(s) will be used.

       addr	   The address of the memory buffer(s) to register.

       length	   The total length of the memory to register.

DESCRIPTION

       Registers  a  memory  buffer that will be accessed by a remote RDMA write operation.  Memory buffers registered using rdma_reg_write may be
       targeted in an RDMA write request, allowing the buffer to be specified on the remote side of an	RDMA  connection  as  the  remote_addr	of
       rdma_post_write, or similar call.

RETURN VALUE

       Returns	a  reference  to the registered memory region on success, or NULL on error.  If an error occurs, errno will be set to indicate the
       failure reason.

NOTES

       rdma_reg_write is used to register a data buffer that will be the target of an RDMA write operation on a  queue	pair  associated  with	an
       rdma_cm_id.   The  memory  buffer  is registered with the proteection domain associated with the idenfier.  The start of the data buffer is
       specified through the addr parameter, and the total size of the buffer is given by length.

       All data buffers should be registered before being posted as a work request.  Users  must  deregister  all  registered  memory  by  calling
       rdma_dereg_mr.

SEE ALSO

       rdma_cm(7), rdma_create_id(3), rdma_create_ep(3), rdma_reg_msgs(3), rdma_reg_read(3), ibv_reg_mr(3), ibv_dereg_mr(3), rdma_post_write(3)

librdmacm							    2010-07-19							 RDMA_REG_WRITE(3)

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

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)

librdmacm							    2010-07-19							 RDMA_POST_READ(3)