usb: usbip: add initial support for USBIP server

The server uses host support to export a USB device to a remote
USBIP client. It supports control and bulk transfers, interrupt
transfers may also work, but this depends on the host controller used.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>

Author: jfischer-no

subsys/usb/host/CMakeLists.txt

@@ -16,4 +16,9 @@ zephyr_library_sources_ifdef(
 	usbh_shell.c
 )
 
+zephyr_library_sources_ifdef(
+  CONFIG_USBIP
+  usbip.c
+)
+
 zephyr_linker_sources(DATA_SECTIONS usbh_data.ld)

subsys/usb/host/Kconfig

@@ -53,4 +53,6 @@ config USBH_MAX_UHC_MSG
 	help
 	  Maximum number of USB host controller events that can be queued.
 
+rsource "Kconfig.usbip"
+
 endif # USB_HOST_STACK

subsys/usb/host/Kconfig.usbip

@@ -0,0 +1,42 @@
+# Copyright (c) 2024 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: Apache-2.0
+
+menuconfig USBIP
+	bool "USB USBIP support"
+	select EXPERIMENTAL
+	select EVENTS
+	depends on NETWORKING
+	depends on NET_IPV4
+	depends on NET_TCP
+	depends on NET_SOCKETS
+	help
+	  Experimental USB USBIP support.
+
+if USBIP
+
+config USBIP_THREAD_STACK_SIZE
+	int "USBIP thread stack size"
+	default 2048
+	help
+	  USBIP thread stack size in bytes.
+
+config USBIP_SUBMIT_BACKLOG_COUNT
+	int "Number of submit commands in the backlog"
+	range 32 128
+	default 48
+	help
+	  Number of submit commands that can be stored in the backlog.
+
+config USBIP_DEVICES_COUNT
+	int "Number of devices that can be exported"
+	range 1 255
+	default 1
+	help
+	  Number of devices that can be exported.
+
+module = USBIP
+module-str = usbip
+source "subsys/logging/Kconfig.template.log_config"
+
+endif # USBIP