Merge #18903

18903: pkg/tinyusb: add tinyUSB netdev driver r=dylad a=gschorcht

### Contribution description

This PR adds the tinyUSB netdev driver.

The tinyUSB netdev driver is part of the tinyUSB package and is enabled by module `tinyusb_netdev`. It is available for boards that provide the `tinyusb_device` feature.

**Please note** Since the tinyUSB package is distinct from (and incompatible with) the USB stack provided around USBUS in RIOT (see USB), the tinyUSB netdev driver cannot be used together with with any USBUS device class.

The tinyUSB netdev driver uses Ethernet over USB and supports the following protocols:
- CDC ECM (Ethernet Control Model)
- CDC NCM (Network Control Model)
- RNDIS (Microsoft Remote NDIS)

While Linux and macOS support all these protocols, Microsoft Windows only supports the RNDIS protocol and since Windows version 11 also the CDC NCM protocol. macOS supports the RNDIS protocol since version 10.15 (Catalina).

Which protocol is used is selected by the corresponding pseudomodules `tinyusb_class_net_cdc_ecm`, `tinyusb_class_net_cdc_ncm` and `tinyusb_class_net_rndis`.

The CDC ECM protocol (`tinyusb_class_net_cdc_ecm`) and the RNDIS protocol (`tinyusb_class_net_rndis`) can be used simultaneously to support all operating systems, for example :
```
USEMODULE='tinyusb_netdev tinyusb_class_net_rndis tinyusb_class_net_cdc_ecm' \
BOARD=... make -C ... flash
 ```
In this case, the CDC ECM protocol is the default protocol and the RNDIS protocol the alternative protocol defined as second device configuration. The CDC NCM protocol cannot be used together with the CDC ECM or the RNDIS protocol.

This PR includes PR #18983 for now to be compilable. 

Comparison with USBUS CDC ECM (`nucleo-f767zi` board):
```
   text	   data	    bss	    dec	    hex	filename
  65916	    596	  18728	  85240	  14cf8	tests_pkg_tinyusb_netdev.elf
```
```
   text	   data	    bss	    dec	    hex	filename
  63120	    544	  15444	  79108	  13504	tests_usbus_cdc_ecm.elf

```

### Testing procedure

Use a board that is supported by tinyUSB. Compile and flash the test application for each protocol:

1. RNDIS
    ```
    BOARD=... make -j8 -C tests/pkg_tinyusb_netdev flash
    ```
2. CDC ECM
    ```
    CLASS=tinyusb_class_net_cdc_ecm BOARD=... make -j8 -C tests/pkg_tinyusb_netdev flash
    ```
3. CDC NCM
    ```
    CLASS=tinyusb_class_net_cdc_ncm BOARD=... make -j8 -C tests/pkg_tinyusb_netdev flash
    ```
For each test, a network interface should be added on the host. Use command `ifconfig` on USB device and on the host and check that both have a link local address. In syslog there should be an output like the following:
<details>

```
Nov 13 18:14:46 gunny8 kernel: [4611465.480025] usb 1-2.2: new full-speed USB device number 28 using xhci_hcd
Nov 13 18:14:47 gunny8 kernel: [4611465.581641] usb 1-2.2: New USB device found, idVendor=1209, idProduct=7d01, bcdDevice= 1.00
Nov 13 18:14:47 gunny8 kernel: [4611465.581646] usb 1-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Nov 13 18:14:47 gunny8 kernel: [4611465.581650] usb 1-2.2: Product: nucleo-f767zi
Nov 13 18:14:47 gunny8 kernel: [4611465.581653] usb 1-2.2: Manufacturer: RIOT-os.org
Nov 13 18:14:47 gunny8 kernel: [4611465.581654] usb 1-2.2: SerialNumber: 6591620BCB270283
Nov 13 18:14:47 gunny8 vmnetBridge: RTM_NEWLINK: name:usb0 index:508 flags:0x00001002
Nov 13 18:14:47 gunny8 vmnet-natd: RTM_NEWLINK: name:usb0 index:508 flags:0x00001002
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.1066] manager: (usb0): new Ethernet device (/org/freedesktop/NetworkManager/Devices/528)
Nov 13 18:14:47 gunny8 kernel: [4611465.594604] rndis_host 1-2.2:1.0 usb0: register 'rndis_host' at usb-0000:00:14.0-2.2, RNDIS device, fa:db:7c:1b:58:80
Nov 13 18:14:47 gunny8 mtp-probe: checking bus 1, device 28: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.2"
Nov 13 18:14:47 gunny8 mtp-probe: bus: 1, device: 28 was not an MTP device
Nov 13 18:14:47 gunny8 systemd-udevd[17796]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
Nov 13 18:14:47 gunny8 vmnet-natd: RTM_NEWLINK: name:usb0 index:508 flags:0x00001002
Nov 13 18:14:47 gunny8 kernel: [4611465.643852] rndis_host 1-2.2:1.0 enp0s20f0u2u2: renamed from usb0
Nov 13 18:14:47 gunny8 vmnetBridge: RTM_NEWLINK: name:usb0 index:508 flags:0x00001002
Nov 13 18:14:47 gunny8 vmnet-natd: RTM_NEWLINK: name:enp0s20f0u2u2 index:508 flags:0x00001002
Nov 13 18:14:47 gunny8 vmnetBridge: RTM_NEWLINK: name:enp0s20f0u2u2 index:508 flags:0x00001002
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.1833] device (usb0): interface index 508 renamed iface from 'usb0' to 'enp0s20f0u2u2'
Nov 13 18:14:47 gunny8 upowerd[2845]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.2/1-2.2:1.1
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.2037] device (enp0s20f0u2u2): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Nov 13 18:14:47 gunny8 vmnet-natd: RTM_NEWLINK: name:enp0s20f0u2u2 index:508 flags:0x00011043
Nov 13 18:14:47 gunny8 vmnetBridge: RTM_NEWLINK: name:enp0s20f0u2u2 index:508 flags:0x00011043
Nov 13 18:14:47 gunny8 vmnetBridge: Adding interface enp0s20f0u2u2 index:508
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.2075] device (enp0s20f0u2u2): carrier: link connected
Nov 13 18:14:47 gunny8 upowerd[2845]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.2/1-2.2:1.0
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.2129] settings: (enp0s20f0u2u2): created default wired connection 'Kabelgebundene Verbindung 2'
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <warn>  [1668359687.2142] device (enp0s20f0u2u2): connectivity: "/proc/sys/net/ipv4/conf/enp0s20f0u2u2/rp_filter" is set to "1". This might break connectivity checking for IPv4 on this device
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.2151] device (enp0s20f0u2u2): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'managed')
Nov 13 18:14:47 gunny8 vmnetBridge: RTM_NEWLINK: name:enp0s20f0u2u2 index:508 flags:0x00011043
Nov 13 18:14:47 gunny8 vmnet-natd: RTM_NEWLINK: name:enp0s20f0u2u2 index:508 flags:0x00011043
Nov 13 18:14:47 gunny8 upowerd[2845]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.2
Nov 13 18:14:47 gunny8 systemd-udevd[17796]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.2403] policy: auto-activating connection 'Kabelgebundene Verbindung 2' (0b1ae45e-c76e-3efb-a2cd-138ca2b2a59c)
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.2414] device (enp0s20f0u2u2): Activation: starting connection 'Kabelgebundene Verbindung 2' (0b1ae45e-c76e-3efb-a2cd-138ca2b2a59c)
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.2419] device (enp0s20f0u2u2): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.2429] device (enp0s20f0u2u2): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.2440] device (enp0s20f0u2u2): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Nov 13 18:14:47 gunny8 NetworkManager[24229]: <info>  [1668359687.2445] dhcp4 (enp0s20f0u2u2): activation: beginning transaction (timeout in 45 seconds)
Nov 13 18:14:47 gunny8 vmnetBridge: RTM_NEWLINK: name:enp0s20f0u2u2 index:508 flags:0x00011043
Nov 13 18:14:47 gunny8 vmnet-natd: RTM_NEWLINK: name:enp0s20f0u2u2 index:508 flags:0x00011043
Nov 13 18:14:47 gunny8 avahi-daemon[1464]: Joining mDNS multicast group on interface enp0s20f0u2u2.IPv6 with address fe80::dba4:adb8:9ffe:d93e.
Nov 13 18:14:47 gunny8 avahi-daemon[1464]: New relevant interface enp0s20f0u2u2.IPv6 for mDNS.
Nov 13 18:14:47 gunny8 avahi-daemon[1464]: Registering new address record for fe80::dba4:adb8:9ffe:d93e on enp0s20f0u2u2.*.
Nov 13 18:14:47 gunny8 kernel: [4611465.895046] userif-1: sent link down event.
Nov 13 18:14:47 gunny8 kernel: [4611465.895052] userif-1: sent link up event.
```

</details>

Ping from and to the host.

### Issues/PRs references

Depends on PR #18983

Co-authored-by: Gunar Schorcht <gunar@schorcht.net>

drivers/Kconfig.net

@@ -36,6 +36,7 @@ rsource "$(RIOTCPU)/stm32/periph/Kconfig.eth"
 rsource "sx126x/Kconfig"
 rsource "sx127x/Kconfig"
 rsource "sx1280/Kconfig"
+rsource "$(RIOTPKG)/tinyusb/netdev/Kconfig"
 rsource "tja1042/Kconfig"
 rsource "w5100/Kconfig"
 endmenu # Network Device Drivers

drivers/include/net/netdev.h

@@ -332,6 +332,7 @@ typedef enum {
  NETDEV_ESP_ETH,
  NETDEV_ESP_WIFI,
  NETDEV_CDC_ECM,
+ NETDEV_TINYUSB,
  /* add more if needed */
 } netdev_type_t;
 /** @} */

pkg/tinyusb/Kconfig

@@ -126,6 +126,9 @@ config MODULE_TINYUSB_HOST
  help
  Select to enable tinyUSB host stack
 
+config MODULE_TINYUSB_LIB_NETWORKING
+ bool
+
 config MODULE_TINYUSB_PORTABLE_ESPRESSIF
  bool
  help
@@ -170,13 +173,7 @@ menu "Device Classes"
  bool "Musical Instrument Digital Interface (MIDI)"
  depends on MODULE_TINYUSB_DEVICE
 
- config MODULE_TINYUSB_CLASS_NET_ECM_RNDIS
- bool "Network with RNDIS, Ethernet Control Model (ECM)"
- depends on MODULE_TINYUSB_DEVICE
-
- config MODULE_TINYUSB_CLASS_NET_NCM
- bool "Network with Network Control Model (NCM)"
- depends on MODULE_TINYUSB_DEVICE
+ rsource "Kconfig.net"
 
  config MODULE_TINYUSB_CLASS_USBTMC
  bool "Test and Measurement Class (USBTMC)"

pkg/tinyusb/Kconfig.net

@@ -0,0 +1,60 @@
+# Copyright (c) 2022 Gunar Schorcht
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+#
+
+menuconfig MODULE_TINYUSB_CLASS_NET
+ bool "Network Device Class"
+ depends on MODULE_TINYUSB_DEVICE
+
+if MODULE_TINYUSB_CLASS_NET
+
+config MODULE_TINYUSB_CLASS_NET_CDC_ECM
+ bool "CDC ECM network device"
+ default y
+
+config MODULE_TINYUSB_CLASS_NET_CDC_NCM
+ bool "CDC NCM network device"
+
+config MODULE_TINYUSB_CLASS_NET_RNDIS
+ bool "RNDIS network device"
+ select MODULE_TINYUSB_LIB_NETWORKING
+
+config TUSBD_NET_NUMOF
+ int
+ default 1
+
+if TUSBD_NET_NUMOF > 0
+
+config TUSBD_NET_NOTIF_EP_SIZE
+ int "Net Notification endpoint size [byte]"
+ default 64
+
+config TUSBD_NET_FS_EP_SIZE
+ int "Net Full-Speed endpoint size [byte]"
+ default 64
+
+config TUSBD_NET_HS_EP_SIZE
+ int "Net High-Speed endpoint size [byte]"
+ default 512
+
+config TUSBD_NET_MTU_SIZE
+ int "MTU size [byte]"
+ default 1514
+
+config TUSBD_NET_DESC_STRING
+ string "Class descriptor string"
+ default "TinyUSB Net"
+
+config TUSBD_NET_CUSTOM_MAC
+ bool "Use custom MAC address string"
+
+config TUSBD_NET_MAC_STRING
+ string "MAC address string"
+ depends on TUSBD_ECM_CUSTOM_MAC
+ default "0123456789ab"
+
+endif # TUSBD_NET_NUMOF > 0
+endif # MODULE_TINYUSB_CLASS_NET

pkg/tinyusb/Makefile

@@ -8,10 +8,11 @@ PKG_LICENSE=MIT
 include $(RIOTBASE)/pkg/pkg.mk
 
 PSRC = $(PKG_SOURCE_DIR)/src
+PLIB = $(PKG_SOURCE_DIR)/lib
 
 .PHONY: all
 
-all: $(filter tinyusb_% stdio_tinyusb_cdc_acm,$(USEMODULE))
+all: $(filter tinyusb_% stdio_tinyusb_cdc_acm,$(filter-out tinyusb_class_net_%,$(USEMODULE)))
  $(QQ)"$(MAKE)" -C $(PSRC) -f $(RIOTBASE)/Makefile.base MODULE=tinyusb
 
 stdio_tinyusb_cdc_acm:
@@ -26,6 +27,9 @@ tinyusb_dfu:
 tinyusb_hw:
  $(QQ)"$(MAKE)" -C $(RIOTPKG)/$(PKG_NAME)/hw
 
+tinyusb_netdev:
+ $(QQ)"$(MAKE)" -C $(RIOTPKG)/$(PKG_NAME)/netdev
+
 tinyusb_class_audio:
  $(QQ)"$(MAKE)" -C $(PSRC)/class/audio -f $(RIOTBASE)/Makefile.base MODULE=$@
 
@@ -50,10 +54,7 @@ tinyusb_class_midi:
 tinyusb_class_msc:
  $(QQ)"$(MAKE)" -C $(PSRC)/class/msc -f $(RIOTBASE)/Makefile.base MODULE=$@
 
-tinyusb_class_net_ecm_rndis:
- $(QQ)"$(MAKE)" -C $(PSRC)/class/net -f $(RIOTBASE)/Makefile.base MODULE=$@
-
-tinyusb_class_net_ncm:
+tinyusb_class_net:
  $(QQ)"$(MAKE)" -C $(PSRC)/class/net -f $(RIOTBASE)/Makefile.base MODULE=$@
 
 tinyusb_class_usbtmc:
@@ -74,6 +75,9 @@ tinyusb_device:
 tinyusb_host:
  $(QQ)"$(MAKE)" -C $(PSRC)/host -f $(RIOTBASE)/Makefile.base MODULE=$@
 
+tinyusb_lib_networking:
+ $(QQ)"$(MAKE)" -C $(PLIB)/networking -f $(RIOTPKG)/$(PKG_NAME)/Makefile.lib_networking
+
 tinyusb_portable_espressif:
  $(QQ)"$(MAKE)" -C $(PSRC)/portable/espressif/esp32sx -f $(RIOTBASE)/Makefile.base MODULE=$@
 

pkg/tinyusb/Makefile.dep

@@ -30,6 +30,24 @@ ifneq (,$(filter tinyusb_dfu,$(USEMODULE)))
  endif
 endif
 
+ifneq (,$(filter tinyusb_class_net_%,$(USEMODULE)))
+ USEMODULE += tinyusb_class_net
+endif
+
+ifneq (,$(filter tinyusb_netdev,$(USEMODULE)))
+ USEMODULE += luid
+ USEMODULE += netdev_eth
+ USEMODULE += tinyusb_device
+ ifeq (,$(filter tinyusb_class_net_%,$(USEMODULE)))
+ # default to CDC ECM
+ USEMODULE += tinyusb_class_net_cdc_ecm
+ endif
+endif
+
+ifneq (,$(filter tinyusb_class_net_rndis,$(USEMODULE)))
+ USEMODULE += tinyusb_lib_networking
+endif
+
 ifeq (,$(filter tinyusb_class_%,$(USEMODULE)))
  $(error At least one tinyusb_class_* module has to be enabled)
 endif
@@ -60,10 +78,7 @@ endif
 ifneq (,$(filter tinyusb_class_midi,$(USEMODULE)))
  USEMODULE += tinyusb_device
 endif
-ifneq (,$(filter tinyusb_class_net_ecm_rndis,$(USEMODULE)))
- USEMODULE += tinyusb_device
-endif
-ifneq (,$(filter tinyusb_class_net_ncm,$(USEMODULE)))
+ifneq (,$(filter tinyusb_class_net,$(USEMODULE)))
  USEMODULE += tinyusb_device
 endif
 ifneq (,$(filter tinyusb_class_usbtmc,$(USEMODULE)))

pkg/tinyusb/Makefile.include

@@ -1,3 +1,7 @@
+PSEUDOMODULES += tinyusb_class_net_cdc_ecm
+PSEUDOMODULES += tinyusb_class_net_cdc_ncm
+PSEUDOMODULES += tinyusb_class_net_rndis
+
 INCLUDES += -I$(RIOTBASE)/pkg/tinyusb/contrib
 INCLUDES += -I$(RIOTBASE)/pkg/tinyusb/contrib/include
 INCLUDES += -I$(RIOTBASE)/pkg/tinyusb/hw/include
@@ -30,10 +34,14 @@ else
  $(error CPU $(CPU) or CPU family $(CPU_FAM) not supported)
 endif
 
-ifneq (,$(filter tinyusb_class_net_ecm_rndis,$(USEMODULE)))
+ifneq (,$(filter tinyusb_class_net tinyusb_lib_networking,$(USEMODULE)))
  INCLUDES += -I$(PKGDIRBASE)/tinyusb/lib/networking
 endif
 
 ifneq (,$(filter tinyusb_dfu,$(USEMODULE)))
  INCLUDES += -I$(RIOTBASE)/pkg/tinyusb/dfu/include
 endif
+
+ifneq (,$(filter tinyusb_netdev,$(USEMODULE)))
+ INCLUDES += -I$(RIOTBASE)/pkg/tinyusb/netdev/include
+endif

pkg/tinyusb/Makefile.lib_networking

@@ -0,0 +1,5 @@
+MODULE = tinyusb_lib_networking
+
+SRC = rndis_reports.c
+
+include $(RIOTBASE)/Makefile.base

pkg/tinyusb/contrib/include/tinyusb.h

@@ -46,6 +46,10 @@
 extern "C" {
 #endif
 
+#if MODULE_TINYUSB_CLASS_NET_RNDIS
+#define SIZEOF_ETH_HDR 14
+#endif
+
 /**
  * @brief Initialize the tinyUSB stack including used peripherals and start the tinyUSB thread
  *

pkg/tinyusb/contrib/include/tinyusb_descriptors.h

@@ -56,6 +56,10 @@ enum {
 #if CONFIG_TUSBD_MSC_NUMOF
  TUSBD_ITF_MSC, /**< MSC interface */
 #endif
+#if CONFIG_TUSBD_NET_NUMOF
+ TUSBD_ITF_NET, /**< NET Notification interface */
+ TUSBD_ITF_NET_DATA, /**< NET Data interface */
+#endif
 #if CONFIG_TUSBD_VENDOR_NUMOF
  TUSBD_ITF_VENDOR, /**< Vendor interface */
 #endif
@@ -87,6 +91,11 @@ enum {
  TUSBD_EP_MSC_OUT = TUSBD_ITF_MSC + 0x01, /**< MSC EP OUT */
  TUSBD_EP_MSC_IN = TUSBD_ITF_MSC + 0x81, /**< MSC EP IN */
 #endif
+#if CONFIG_TUSBD_NET_NUMOF
+ TUSBD_EP_NET_NOTIF = TUSBD_ITF_NET + 0x81, /**< NET Notification EP IN */
+ TUSBD_EP_NET_OUT = TUSBD_ITF_NET_DATA + 0x01, /**< NET Data EP OUT */
+ TUSBD_EP_NET_IN = TUSBD_ITF_NET_DATA + 0x81, /**< NET Data EP IN */
+#endif
 #if CONFIG_TUSBD_VENDOR_NUMOF
  TUSBD_EP_VENDOR_OUT = TUSBD_ITF_VENDOR + 0x01, /**< Vendor EP OUT */
  TUSBD_EP_VENDOR_IN = TUSBD_ITF_VENDOR + 0x81, /**< Vendor EP IN */
@@ -123,6 +132,20 @@ enum {
 #if CONFIG_TUSBD_MSC_NUMOF
  TUSBD_STR_IDX_MSC,
 #endif
+
+#if CONFIG_TUSBD_NET_NUMOF
+#if CONFIG_TUSBD_NET_CDC_ECM
+ TUSBD_STR_IDX_NET_CDC_ECM,
+#endif /* CONFIG_TUSBD_NET_CDC_ECM */
+#if CONFIG_TUSBD_NET_CDC_NCM
+ TUSBD_STR_IDX_NET_CDC_NCM,
+#endif /* CONFIG_TUSBD_NET_CDC_NCM */
+#if CONFIG_TUSBD_NET_RNDIS
+ TUSBD_STR_IDX_NET_RNDIS,
+#endif /* CONFIG_TUSBD_NET_RNDIS */
+ TUSBD_STR_IDX_NET_MAC,
+#endif /* CONFIG_TUSBD_NET_NUMOF */
+
 #if CONFIG_TUSBD_VENDOR_NUMOF
  TUSBD_STR_IDX_VENDOR,
 #endif
@@ -134,22 +157,46 @@ enum {
 #define CONFIG_TUSBD_DFU_ALT_NUMOF 2
 
 #if !defined(TUSBD_DESC_TOTAL_LEN)
+
+#if CONFIG_TUSBD_NET_CDC_ECM
+#define TUSBD_DESC_NET_LEN TUD_CDC_ECM_DESC_LEN
+#elif CONFIG_TUSBD_NET_CDC_NCM
+#define TUSBD_DESC_NET_LEN TUD_CDC_NCM_DESC_LEN
+#elif CONFIG_TUSBD_NET_RNDIS
+#define TUSBD_DESC_NET_LEN TUD_RNDIS_DESC_LEN
+#else
+#define TUSBD_DESC_NET_LEN 0
+#endif
+
 #define TUSBD_DESC_TOTAL_LEN (TUD_CONFIG_DESC_LEN + \
  (CONFIG_TUSBD_CDC_NUMOF * TUD_CDC_DESC_LEN) + \
  (CONFIG_TUSBD_DFU_NUMOF * TUD_DFU_DESC_LEN(CONFIG_TUSBD_DFU_ALT_NUMOF)) + \
  (CONFIG_TUSBD_DFU_RT_NUMOF * TUD_DFU_RT_DESC_LEN) + \
  (CONFIG_TUSBD_HID_NUMOF * TUD_HID_INOUT_DESC_LEN) + \
  (CONFIG_TUSBD_MSC_NUMOF * TUD_MSC_DESC_LEN) + \
- (CONFIG_TUSBD_VENDOR_NUMOF * TUD_VENDOR_DESC_LEN))
+ (CONFIG_TUSBD_VENDOR_NUMOF * TUD_VENDOR_DESC_LEN) + \
+ TUSBD_DESC_NET_LEN)
+
 #endif /* !defined(TUSBD_DESC_TOTAL_LEN) */
 
+/* If CDC ECM and RNDIS are used simultaneously, an alternative configuration
+ * descriptor is required. In this case, the main configuration descriptor
+ * contains the CDC ECM interface descriptor and the alternative configuration
+ * descriptor contains the RNDIS interface descriptor. */
+#if CONFIG_TUSBD_NET_CDC_ECM && CONFIG_TUSBD_NET_RNDIS
+
+#define TUSBD_DESC_ALT_NET_LEN TUD_RNDIS_DESC_LEN
+
 #define TUSBD_DESC_ALT_TOTAL_LEN (TUD_CONFIG_DESC_LEN + \
  (CONFIG_TUSBD_CDC_NUMOF * TUD_CDC_DESC_LEN) + \
  (CONFIG_TUSBD_DFU_NUMOF * TUD_DFU_DESC_LEN(CONFIG_TUSBD_DFU_ALT_NUMOF)) + \
  (CONFIG_TUSBD_DFU_RT_NUMOF * TUD_DFU_RT_DESC_LEN) + \
  (CONFIG_TUSBD_HID_NUMOF * TUD_HID_INOUT_DESC_LEN) + \
  (CONFIG_TUSBD_MSC_NUMOF * TUD_MSC_DESC_LEN) + \
- (CONFIG_TUSBD_VENDOR_NUMOF * TUD_VENDOR_DESC_LEN))
+ (CONFIG_TUSBD_VENDOR_NUMOF * TUD_VENDOR_DESC_LEN) + \
+ TUSBD_DESC_ALT_NET_LEN)
+
+#endif /* CONFIG_TUSBD_NET_CDC_ECM && CONFIG_TUSBD_NET_RNDIS */
 
 #endif /* !defined(CONFIG_TUSBD_USE_CUSTOM_DESC) */