layout: page title: EFADV_QUERY_CQ section: 3 tagline: Verbs date: 2025-04-15 header: “EFA Direct Verbs Manual” footer: efa

NAME

efadv_query_cq - Query EFA specific Completion Queue attributes

#include <infiniband/efadv.h>

int efadv_query_cq(struct ibv_cq *ibvcq, struct efadv_cq_attr *attr,
                   uint32_t inlen);

efadv_query_cq() queries device-specific Completion Queue attributes.

Compatibility is handled using the comp_mask and inlen fields.

struct efadv_cq_attr {
	uint64_t comp_mask;
	uint8_t *buffer;
	uint32_t entry_size;
	uint32_t num_entries;
};

inlen : In: Size of struct efadv_cq_attr.

comp_mask : Compatibility mask.

buffer : Completion queue buffer.

entry_size : Size of each completion queue entry.

num_entries : Maximal number of entries in the completion queue.

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