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LEARN ABOUT DEBIAN

ibv_reg_mr

IBV_REG_MR(3)						  Libibverbs Programmer's Manual					     IBV_REG_MR(3)

NAME

       ibv_reg_mr, ibv_dereg_mr - register or deregister a memory region (MR)

SYNOPSIS

       #include <infiniband/verbs.h>

       struct ibv_mr *ibv_reg_mr(struct ibv_pd *pd, void *addr,
				 size_t length, int access);

       int ibv_dereg_mr(struct ibv_mr *mr);

DESCRIPTION

       ibv_reg_mr()  registers	a  memory region (MR) associated with the protection domain pd.  The MR's starting address is addr and its size is
       length.	The argument access describes the desired memory protection attributes; it is either 0 or the bitwise OR of one  or  more  of  the
       following flags:

       IBV_ACCESS_LOCAL_WRITE  Enable Local Write Access

       IBV_ACCESS_REMOTE_WRITE	Enable Remote Write Access

       IBV_ACCESS_REMOTE_READ Enable Remote Read Access

       IBV_ACCESS_REMOTE_ATOMIC Enable Remote Atomic Operation Access (if supported)

       IBV_ACCESS_MW_BIND Enable Memory Window Binding

       If IBV_ACCESS_REMOTE_WRITE or IBV_ACCESS_REMOTE_ATOMIC is set, then IBV_ACCESS_LOCAL_WRITE must be set too.

       Local read access is always enabled for the MR.

       ibv_dereg_mr() deregisters the MR mr.

RETURN VALUE

       ibv_reg_mr()  returns  a  pointer to the registered MR, or NULL if the request fails.  The local key (L_Key) field lkey is used as the lkey
       field of struct ibv_sge when posting buffers with ibv_post_* verbs, and the the remote key (R_Key) field rkey is used by  remote  processes
       to  perform  Atomic  and  RDMA  operations.   The  remote  process  places  this rkey as the rkey field of struct ibv_send_wr passed to the
       ibv_post_send function.

       ibv_dereg_mr() returns 0 on success, or the value of errno on failure (which indicates the failure reason).

NOTES

       ibv_dereg_mr() fails if any memory window is still bound to this MR.

SEE ALSO

       ibv_alloc_pd(3), ibv_post_send(3), ibv_post_recv(3), ibv_post_srq_recv(3)

AUTHORS

       Dotan Barak <dotanba@gmail.com>

libibverbs							    2006-10-31							     IBV_REG_MR(3)