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 18 struct 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 */ 31