EFADV_QUERY_DEVICE(3) EFA Direct Verbs Manual EFADV_QUERY_DEVICE(3) NAME efadv_query_device - Query device capabilities SYNOPSIS #include 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 EFADV_DEVICE_ATTR_CAPS_UNSOLICITED_WRITE_RECV: Indicates the device has support for creating QPs that can receive unsolicited RDMA write with immediate. RQ with this feature enabled will not consume any work requests in order to receive RDMA write with immediate and a WC generated for such receive will be marked as unsolicited. 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 o Compatibility mask (comp_mask) is an out field and currently has no values. AUTHORS Gal Pressman efa 2019-04-22 EFADV_QUERY_DEVICE(3)