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rpma_mr_reg(3) RPMA Programmer's Manual rpma_mr_reg(3)


rpma_mr_reg - create a local memory registration object


#include <librpma.h>
struct rpma_peer;
struct rpma_mr_local;
int rpma_mr_reg(struct rpma_peer *peer, void *ptr, size_t size, int usage,
struct rpma_mr_local **mr_ptr);


rpma_mr_reg() registers a memory region and creates a local memory registration object. The usage parameter specifies the operations that can be performed on the given memory region which should be expressed as bitwise-inclusive OR of the following:

  • RPMA_MR_USAGE_READ_SRC - memory used as a source of the read operation
  • RPMA_MR_USAGE_READ_DST - memory used as a destination of the read operation
  • RPMA_MR_USAGE_WRITE_SRC - memory used as a source of the write operation
  • RPMA_MR_USAGE_WRITE_DST - memory used as a destination of the write operation
  • RPMA_MR_USAGE_FLUSH_TYPE_VISIBILITY - memory with available flush operation
  • RPMA_MR_USAGE_FLUSH_TYPE_PERSISTENT - memory with available persistent flush operation
  • RPMA_MR_USAGE_SEND - memory used for send operation
  • RPMA_MR_USAGE_RECV - memory used for receive operation


The rpma_mr_reg() function returns 0 on success or a negative error code on failure. rpma_mr_reg() does not set *mr_ptr value on failure.


rpma_mr_reg() can fail with the following errors:

  • RPMA_E_INVAL - peer or ptr or mr_ptr is NULL
  • RPMA_E_INVAL - size equals 0
  • RPMA_E_NOMEM - out of memory
  • RPMA_E_PROVIDER - memory registration failed


rpma_conn_req_recv(3), rpma_mr_dereg(3), rpma_mr_get_descriptor(3), rpma_mr_get_descriptor_size(3), rpma_peer_new(3), rpma_read(3), rpma_recv(3), rpma_send(3), rpma_write(3), rpma_atomic_write(3), librpma(7) and

29 May 2023 RPMA