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---
layout: page
title: EFADV_QUERY_MR
section: 3
tagline: Verbs
date: 2023-11-13
header: "EFA Direct Verbs Manual"
footer: efa
---
# NAME
efadv_query_mr - Query EFA specific Memory Region attributes
# SYNOPSIS
```c
#include <infiniband/efadv.h>
int efadv_query_mr(struct ibv_mr *ibvmr, struct efadv_mr_attr *attr, uint32_t inlen);
```
# DESCRIPTION
**efadv_query_mr()** queries device-specific Memory Region attributes.
Compatibility is handled using the comp_mask and inlen fields.
```c
struct efadv_mr_attr {
uint64_t comp_mask;
uint16_t ic_id_validity;
uint16_t recv_ic_id;
uint16_t rdma_read_ic_id;
uint16_t rdma_recv_ic_id;
};
```
*inlen*
: In: Size of struct efadv_mr_attr.
*comp_mask*
: Compatibility mask.
*ic_id_validity*
: Validity mask of interconnect id fields:
EFADV_MR_ATTR_VALIDITY_RECV_IC_ID:
recv_ic_id has a valid value.
EFADV_MR_ATTR_VALIDITY_RDMA_READ_IC_ID:
rdma_read_ic_id has a valid value.
EFADV_MR_ATTR_VALIDITY_RDMA_RECV_IC_ID:
rdma_recv_ic_id has a valid value.
*recv_ic_id*
: Physical interconnect used by the device to reach the MR for receive operation.
*rdma_read_ic_id*
: Physical interconnect used by the device to reach the MR for RDMA read operation.
*rdma_recv_ic_id*
: Physical interconnect used by the device to reach the MR for RDMA write receive.
# RETURN VALUE
**efadv_query_mr()** returns 0 on success, or the value of errno on failure
(which indicates the failure reason).
# SEE ALSO
**efadv**(7)
# NOTES
* Compatibility mask (comp_mask) is an out field and currently has no values.
# AUTHORS
Michael Margolin <mrgolin@amazon.com>
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