@@ -13775,6 +13775,7 @@ L: netdev@vger.kernel.org
S: Maintained
F: Documentation/networking/mctp.rst
F: drivers/net/mctp/
+F: include/linux/usb/mctp-usb.h
F: include/net/mctp.h
F: include/net/mctpdevice.h
F: include/net/netns/mctp.h
new file mode 100644
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * mctp-usb.h - MCTP USB transport binding: common definitions.
+ *
+ * These are protocol-level definitions, that may be shared between host
+ * and gadget drivers.
+ *
+ * Copyright (C) 2024 Code Construct Pty Ltd
+ */
+
+#ifndef __LINUX_USB_MCTP_USB_H
+#define __LINUX_USB_MCTP_USB_H
+
+#include <linux/types.h>
+
+struct mctp_usb_hdr {
+ __be16 id;
+ __u8 rsvd;
+ __u8 len;
+} __packed;
+
+#define MCTP_USB_XFER_SIZE 512
+#define MCTP_USB_BTU 68
+#define MCTP_USB_MTU_MIN MCTP_USB_BTU
+#define MCTP_USB_MTU_MAX (U8_MAX - sizeof(struct mctp_usb_hdr))
+#define MCTP_USB_DMTF_ID 0x1ab4
+
+#endif /* __LINUX_USB_MCTP_USB_H */
@@ -330,6 +330,7 @@ struct usb_device_descriptor {
#define USB_CLASS_AUDIO_VIDEO 0x10
#define USB_CLASS_BILLBOARD 0x11
#define USB_CLASS_USB_TYPE_C_BRIDGE 0x12
+#define USB_CLASS_MCTP 0x14
#define USB_CLASS_MISC 0xef
#define USB_CLASS_APP_SPEC 0xfe
#define USB_SUBCLASS_DFU 0x01
Upcoming changes will add a USB host (and later gadget) driver for the MCTP-over-USB protocol. Add a header that provides common definitions for protocol support: the packet header format and a few framing definitions. Add a define for the MCTP class code, as per https://usb.org/defined-class-codes. Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> --- MAINTAINERS | 1 + include/linux/usb/mctp-usb.h | 28 ++++++++++++++++++++++++++++ include/uapi/linux/usb/ch9.h | 1 + 3 files changed, 30 insertions(+)