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ibv_dereg_mr

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>