diff options
| author | Jeremy Kerr <jk@codeconstruct.com.au> | 2025-02-21 08:56:57 +0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-02-21 16:45:21 -0800 |
| commit | dcc35baae732b9079b2c6595cfd86da02b34a4e6 (patch) | |
| tree | e4b74881cc5203a918be40fd253ab6f170aa7dcb | |
| parent | e6a532185daae9302bf2f358c8675733093b906e (diff) | |
usb: Add base USB MCTP definitions
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>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patch.msgid.link/20250221-dev-mctp-usb-v3-1-3353030fe9cc@codeconstruct.com.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | MAINTAINERS | 1 | ||||
| -rw-r--r-- | include/linux/usb/mctp-usb.h | 30 | ||||
| -rw-r--r-- | include/uapi/linux/usb/ch9.h | 1 |
3 files changed, 32 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index b0cd54818bb3..8019d5a97546 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13896,6 +13896,7 @@ 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 diff --git a/include/linux/usb/mctp-usb.h b/include/linux/usb/mctp-usb.h new file mode 100644 index 000000000000..a2f6f1e04efb --- /dev/null +++ b/include/linux/usb/mctp-usb.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * mctp-usb.h - MCTP USB transport binding: common definitions, + * based on DMTF0283 specification: + * https://www.dmtf.org/sites/default/files/standards/documents/DSP0283_1.0.1.pdf + * + * These are protocol-level definitions, that may be shared between host + * and gadget drivers. + * + * Copyright (C) 2024-2025 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 */ diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h index 91f0f7e214a5..052290652046 100644 --- a/include/uapi/linux/usb/ch9.h +++ b/include/uapi/linux/usb/ch9.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 |