table of contents
EFADV_QUERY_DEVICE(3) | EFA Direct Verbs Manual | EFADV_QUERY_DEVICE(3) |
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.
EFADV_DEVICE_ATTR_CAPS_CQ_WITH_SGID: Reading source address (SGID) from receive completion descriptors is supported. Valid only for unknown AH.
EFADV_DEVICE_ATTR_CAPS_RDMA_WRITE: RDMA write is supported
- 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¶
NOTES¶
- •
- Compatibility mask (comp_mask) is an out field and currently has no values.
AUTHORS¶
Gal Pressman <galpress@amazon.com>
2019-04-22 | efa |