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+.\" -*- nroff -*-
+.\" Licensed under the OpenIB.org BSD license (FreeBSD Variant) - See COPYING.md
+.\"
+.TH IBV_QUERY_DEVICE 3 2006-10-31 libibverbs "Libibverbs Programmer's Manual"
+.SH "NAME"
+ibv_query_device \- query an RDMA device's attributes
+.SH "SYNOPSIS"
+.nf
+.B #include <infiniband/verbs.h>
+.sp
+.BI "int ibv_query_device(struct ibv_context " "*context",
+.BI "                     struct ibv_device_attr " "*device_attr" );
+.fi
+.SH "DESCRIPTION"
+.B ibv_query_device()
+returns the attributes of the device with context
+.I context\fR.
+The argument
+.I device_attr
+is a pointer to an ibv_device_attr struct, as defined in <infiniband/verbs.h>.
+.PP
+.nf
+struct ibv_device_attr {
+.in +8
+char                    fw_ver[64];             /* FW version */
+uint64_t                node_guid;              /* Node GUID (in network byte order) */
+uint64_t                sys_image_guid;         /* System image GUID (in network byte order) */
+uint64_t                max_mr_size;            /* Largest contiguous block that can be registered */
+uint64_t                page_size_cap;          /* Supported memory shift sizes */
+uint32_t                vendor_id;              /* Vendor ID, per IEEE */
+uint32_t                vendor_part_id;         /* Vendor supplied part ID */
+uint32_t                hw_ver;                 /* Hardware version */
+int                     max_qp;                 /* Maximum number of supported QPs */
+int                     max_qp_wr;              /* Maximum number of outstanding WR on any work queue */
+int                     device_cap_flags;       /* HCA capabilities mask */
+int                     max_sge;                /* Maximum number of s/g per WR for SQ & RQ of QP for non RDMA Read operations */
+int                     max_sge_rd;             /* Maximum number of s/g per WR for RDMA Read operations */
+int                     max_cq;                 /* Maximum number of supported CQs */
+int                     max_cqe;                /* Maximum number of CQE capacity per CQ */
+int                     max_mr;                 /* Maximum number of supported MRs */
+int                     max_pd;                 /* Maximum number of supported PDs */
+int                     max_qp_rd_atom;         /* Maximum number of RDMA Read & Atomic operations that can be outstanding per QP */
+int                     max_ee_rd_atom;         /* Maximum number of RDMA Read & Atomic operations that can be outstanding per EEC */
+int                     max_res_rd_atom;        /* Maximum number of resources used for RDMA Read & Atomic operations by this HCA as the Target */
+int                     max_qp_init_rd_atom;    /* Maximum depth per QP for initiation of RDMA Read & Atomic operations */ 
+int                     max_ee_init_rd_atom;    /* Maximum depth per EEC for initiation of RDMA Read & Atomic operations */
+enum ibv_atomic_cap     atomic_cap;             /* Atomic operations support level */
+int                     max_ee;                 /* Maximum number of supported EE contexts */
+int                     max_rdd;                /* Maximum number of supported RD domains */
+int                     max_mw;                 /* Maximum number of supported MWs */
+int                     max_raw_ipv6_qp;        /* Maximum number of supported raw IPv6 datagram QPs */
+int                     max_raw_ethy_qp;        /* Maximum number of supported Ethertype datagram QPs */
+int                     max_mcast_grp;          /* Maximum number of supported multicast groups */
+int                     max_mcast_qp_attach;    /* Maximum number of QPs per multicast group which can be attached */
+int                     max_total_mcast_qp_attach;/* Maximum number of QPs which can be attached to multicast groups */
+int                     max_ah;                 /* Maximum number of supported address handles */
+int                     max_fmr;                /* Maximum number of supported FMRs */
+int                     max_map_per_fmr;        /* Maximum number of (re)maps per FMR before an unmap operation in required */
+int                     max_srq;                /* Maximum number of supported SRQs */
+int                     max_srq_wr;             /* Maximum number of WRs per SRQ */
+int                     max_srq_sge;            /* Maximum number of s/g per SRQ */
+uint16_t                max_pkeys;              /* Maximum number of partitions */
+uint8_t                 local_ca_ack_delay;     /* Local CA ack delay */
+uint8_t                 phys_port_cnt;          /* Number of physical ports */
+.in -8
+};
+.fi
+.SH "RETURN VALUE"
+.B ibv_query_device()
+returns 0 on success, or the value of errno on failure (which indicates the failure reason).
+.SH "NOTES"
+The maximum values returned by this function are the upper limits of
+supported resources by the device.  However, it may not be possible to
+use these maximum values, since the actual number of any resource that
+can be created may be limited by the machine configuration, the amount
+of host memory, user permissions, and the amount of resources already
+in use by other users/processes.
+.SH "SEE ALSO"
+.BR ibv_open_device (3),
+.BR ibv_query_port (3),
+.BR ibv_query_pkey (3),
+.BR ibv_query_gid (3)
+.SH "AUTHORS"
+.TP
+Dotan Barak <dotanba@gmail.com>