EFADV_QUERY_DEVICE

Section: EFA Direct Verbs Manual (3)
Updated: 2019-04-22
Page Index
 

NAME

efadv_query_device - Query device capabilities  

SYNOPSIS


#include <infiniband/efadv.h>

int efadv_query_device(struct ibv_context *ibvctx,
               struct efadv_device_attr *attr,
               uint32_t inlen);

 

DESCRIPTION

efadv_query_device() Queries EFA device specific attributes.

Compatibility is handled using the comp_mask and inlen fields.


struct efadv_device_attr {
    uint64_t comp_mask;
    uint32_t max_sq_wr;
    uint32_t max_rq_wr;
    uint16_t max_sq_sge;
    uint16_t max_rq_sge;
    uint16_t inline_buf_size;
    uint8_t reserved[2];
    uint32_t device_caps;
    uint32_t max_rdma_size;
};

inlen
In: Size of struct efadv_device_attr.
comp_mask
Compatibility mask.
max_sq_wr
Maximum Send Queue (SQ) Work Requests (WRs).
max_rq_wr
Maximum Receive Queue (RQ) Work Requests (WRs).
max_sq_sge
Maximum Send Queue (SQ) Scatter Gather Elements (SGEs).
max_rq_sge
Maximum Receive Queue (RQ) Scatter Gather Elements (SGEs).
inline_buf_size
Maximum inline buffer size.
device_caps
Bitmask of device capabilities:

EFADV_DEVICE_ATTR_CAPS_RDMA_READ: RDMA read is supported.

EFADV_DEVICE_ATTR_CAPS_RNR_RETRY: RNR retry is supported for SRD QPs.

max_rdma_size
Maximum RDMA transfer size in bytes.
 

RETURN VALUE

efadv_query_device() 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

Gal Pressman <galpress@amazon.com>


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
SEE ALSO
NOTES
AUTHORS