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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * mctp-usb.h - MCTP USB transport binding: common definitions,
4 * based on DMTF0283 specification:
5 * https://www.dmtf.org/sites/default/files/standards/documents/DSP0283_1.0.1.pdf
6 *
7 * These are protocol-level definitions, that may be shared between host
8 * and gadget drivers.
9 *
10 * Copyright (C) 2024-2025 Code Construct Pty Ltd
11 */
12
13#ifndef __LINUX_USB_MCTP_USB_H
14#define __LINUX_USB_MCTP_USB_H
15
16#include <linux/types.h>
17
18struct mctp_usb_hdr {
19 __be16 id;
20 u8 rsvd;
21 u8 len;
22} __packed;
23
24#define MCTP_USB_XFER_SIZE 512
25#define MCTP_USB_BTU 68
26#define MCTP_USB_MTU_MIN MCTP_USB_BTU
27#define MCTP_USB_MTU_MAX (U8_MAX - sizeof(struct mctp_usb_hdr))
28#define MCTP_USB_DMTF_ID 0x1ab4
29
30#endif /* __LINUX_USB_MCTP_USB_H */