include/uapi/rdma/ib_user_mad.h

Source file repositories/reference/linux-study-clean/include/uapi/rdma/ib_user_mad.h

File Facts

System
Linux kernel
Corpus path
include/uapi/rdma/ib_user_mad.h
Extension
.h
Size
8530 bytes
Lines
235
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ib_user_mad_hdr_old {
	__u32	id;
	__u32	status;
	__u32	timeout_ms;
	__u32	retries;
	__u32	length;
	__be32	qpn;
	__be32  qkey;
	__be16	lid;
	__u8	sl;
	__u8	path_bits;
	__u8	grh_present;
	__u8	gid_index;
	__u8	hop_limit;
	__u8	traffic_class;
	__u8	gid[16];
	__be32	flow_label;
};

/**
 * ib_user_mad_hdr - MAD packet header
 *   This layout allows specifying/receiving the P_Key index.  To use
 *   this capability, an application must call the
 *   IB_USER_MAD_ENABLE_PKEY ioctl on the user MAD file handle before
 *   any other actions with the file handle.
 * @id - ID of agent MAD received with/to be sent with
 * @status - 0 on successful receive, ETIMEDOUT if no response
 *   received (transaction ID in data[] will be set to TID of original
 *   request) (ignored on send)
 * @timeout_ms - Milliseconds to wait for response (unset on receive)
 * @retries - Number of automatic retries to attempt
 * @qpn - Remote QP number received from/to be sent to
 * @qkey - Remote Q_Key to be sent with (unset on receive)
 * @lid - Remote lid received from/to be sent to
 * @sl - Service level received with/to be sent with
 * @path_bits - Local path bits received with/to be sent with
 * @grh_present - If set, GRH was received/should be sent
 * @gid_index - Local GID index to send with (unset on receive)
 * @hop_limit - Hop limit in GRH
 * @traffic_class - Traffic class in GRH
 * @gid - Remote GID in GRH
 * @flow_label - Flow label in GRH
 * @pkey_index - P_Key index
 */
struct ib_user_mad_hdr {
	__u32	id;
	__u32	status;
	__u32	timeout_ms;
	__u32	retries;
	__u32	length;
	__be32	qpn;
	__be32  qkey;
	__be16	lid;
	__u8	sl;
	__u8	path_bits;
	__u8	grh_present;
	__u8	gid_index;
	__u8	hop_limit;
	__u8	traffic_class;
	__u8	gid[16];
	__be32	flow_label;
	__u16	pkey_index;
	__u8	reserved[6];
};

/**
 * ib_user_mad - MAD packet
 * @hdr - MAD packet header
 * @data - Contents of MAD
 *
 */
struct ib_user_mad {
	struct ib_user_mad_hdr hdr;
	__aligned_u64	data[];
};

/*
 * Earlier versions of this interface definition declared the
 * method_mask[] member as an array of __u32 but treated it as a
 * bitmap made up of longs in the kernel.  This ambiguity meant that
 * 32-bit big-endian applications that can run on both 32-bit and
 * 64-bit kernels had no consistent ABI to rely on, and 64-bit
 * big-endian applications that treated method_mask as being made up
 * of 32-bit words would have their bitmap misinterpreted.
 *
 * To clear up this confusion, we change the declaration of
 * method_mask[] to use unsigned long and handle the conversion from
 * 32-bit userspace to 64-bit kernel for big-endian systems in the
 * compat_ioctl method.  Unfortunately, to keep the structure layout
 * the same, we need the method_mask[] array to be aligned only to 4

Annotation

Implementation Notes