fix(esp_tinyusb): Fix NCM NTB buffers configuration

device/esp_tinyusb/CHANGELOG.md

@@ -1,3 +1,7 @@
+## [Unreleased]
+
+- esp_tinyusb: Added possibility to configure NCM Transfer Blocks (NTB) via menuconfig
+
 ## 1.6.0
 
 - CDC-ACM: Fixed memory leak on deinit

device/esp_tinyusb/Kconfig

@@ -285,6 +285,51 @@ menu "TinyUSB Stack"
             config TINYUSB_NET_MODE_NONE
                 bool "None"
         endchoice
+
+        config TINYUSB_NCM_OUT_NTB_BUFFS_COUNT
+            int "Number of NCM NTB buffers for reception side"
+            depends on TINYUSB_NET_MODE_NCM
+            default 3
+            range 1 6
+            help
+                Number of NTB buffers for reception side.
+                Can be increased to improve performance and stability with the cost of additional RAM requirements.
+                Helps to mitigate "tud_network_can_xmit: request blocked" warning message when running NCM device.
+
+        config TINYUSB_NCM_IN_NTB_BUFFS_COUNT
+            int "Number of NCM NTB buffers for transmission side"
+            depends on TINYUSB_NET_MODE_NCM
+            default 3
+            range 1 6
+            help
+                Number of NTB buffers for transmission side.
+                Can be increased to improve performance and stability with the cost of additional RAM requirements.
+                Helps to mitigate "tud_network_can_xmit: request blocked" warning message when running NCM device.
+
+        config TINYUSB_NCM_OUT_NTB_BUFF_MAX_SIZE
+            int "NCM NTB Buffer size for reception size"
+            depends on TINYUSB_NET_MODE_NCM
+            default 8192
+            range 1600 10240
+            help
+              Size of NTB buffers on the reception side. The minimum size used by Linux is 2048 bytes.
+              NTB buffer size must be significantly larger than the MTU (Maximum Transmission Unit).
+              The typical default MTU size for Ethernet is 1500 bytes, plus an additional packet overhead.
+              To improve performance, the NTB buffer size should be large enough to fit multiple MTU-sized
+              frames in a single NTB buffer and it's length should be multiple of 4.
+
+        config TINYUSB_NCM_IN_NTB_BUFF_MAX_SIZE
+            int "NCM NTB Buffer size for transmission size"
+            depends on TINYUSB_NET_MODE_NCM
+            default 8192
+            range 1600 10240
+            help
+              Size of NTB buffers on the transmission side. The minimum size used by Linux is 2048 bytes.
+              NTB buffer size must be significantly larger than the MTU (Maximum Transmission Unit).
+              The typical default MTU size for Ethernet is 1500 bytes, plus an additional packet overhead.
+              To improve performance, the NTB buffer size should be large enough to fit multiple MTU-sized
+              frames in a single NTB buffer and it's length should be multiple of 4.
+
     endmenu # "Network driver (ECM/NCM/RNDIS)"
 
     menu "Vendor Specific Interface"

device/esp_tinyusb/include/tusb_config.h

@@ -1,6 +1,6 @@
 /*
  * SPDX-FileCopyrightText: 2019 Ha Thach (tinyusb.org),
- * SPDX-FileContributor: 2020-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileContributor: 2020-2025 Espressif Systems (Shanghai) CO LTD
  * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2019 Ha Thach (tinyusb.org),
@@ -173,6 +173,12 @@ extern "C" {
 #define CFG_TUD_DFU_RUNTIME         CONFIG_TINYUSB_DFU_MODE_DFU_RUNTIME
 #define CFG_TUD_BTH                 CONFIG_TINYUSB_BTH_ENABLED
 
+// NCM NET Mode NTB buffers configuration
+#define CFG_TUD_NCM_OUT_NTB_N         CONFIG_TINYUSB_NCM_OUT_NTB_BUFFS_COUNT
+#define CFG_TUD_NCM_IN_NTB_N          CONFIG_TINYUSB_NCM_IN_NTB_BUFFS_COUNT
+#define CFG_TUD_NCM_OUT_NTB_MAX_SIZE  CONFIG_TINYUSB_NCM_OUT_NTB_BUFF_MAX_SIZE
+#define CFG_TUD_NCM_IN_NTB_MAX_SIZE   CONFIG_TINYUSB_NCM_IN_NTB_BUFF_MAX_SIZE
+
 #ifdef __cplusplus
 }
 #endif