diff --git a/examples/device/cdc_dual_ports/src/tusb_config.h b/examples/device/cdc_dual_ports/src/tusb_config.h
index f8c36a90d..633a3faea 100644
--- a/examples/device/cdc_dual_ports/src/tusb_config.h
+++ b/examples/device/cdc_dual_ports/src/tusb_config.h
@@ -103,8 +103,8 @@
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
-// CDC Endpoint transfer buffer size, more is faster
-// Only increase RX_EPSIZE if your host driver/application support zero-length packet (ZLP)
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
diff --git a/examples/device/cdc_msc/src/tusb_config.h b/examples/device/cdc_msc/src/tusb_config.h
index c4f4374a2..f0709d8fb 100644
--- a/examples/device/cdc_msc/src/tusb_config.h
+++ b/examples/device/cdc_msc/src/tusb_config.h
@@ -103,8 +103,8 @@
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
-// CDC Endpoint transfer buffer size, more is faster
-// Only increase RX_EPSIZE if your host driver/application support zero-length packet (ZLP)
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
diff --git a/examples/device/cdc_msc_freertos/src/tusb_config.h b/examples/device/cdc_msc_freertos/src/tusb_config.h
index 33342819e..a78f2ea05 100644
--- a/examples/device/cdc_msc_freertos/src/tusb_config.h
+++ b/examples/device/cdc_msc_freertos/src/tusb_config.h
@@ -110,8 +110,8 @@
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
-// CDC Endpoint transfer buffer size, more is faster
-// Only increase RX_EPSIZE if your host driver/application support zero-length packet (ZLP)
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
diff --git a/examples/device/cdc_uac2/src/tusb_config.h b/examples/device/cdc_uac2/src/tusb_config.h
index 6724b83b3..358ff6747 100644
--- a/examples/device/cdc_uac2/src/tusb_config.h
+++ b/examples/device/cdc_uac2/src/tusb_config.h
@@ -159,8 +159,8 @@ extern "C" {
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
-// CDC Endpoint transfer buffer size, more is faster
-// Only increase RX_EPSIZE if your host driver/application support zero-length packet (ZLP)
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
diff --git a/examples/device/printer_to_cdc/src/tusb_config.h b/examples/device/printer_to_cdc/src/tusb_config.h
index d12313ce5..74b96c8f6 100644
--- a/examples/device/printer_to_cdc/src/tusb_config.h
+++ b/examples/device/printer_to_cdc/src/tusb_config.h
@@ -102,7 +102,8 @@ extern "C" {
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
-// CDC Endpoint transfer buffer size
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
diff --git a/examples/dual/dynamic_switch/src/tusb_config.h b/examples/dual/dynamic_switch/src/tusb_config.h
index f9500f923..f3e016305 100644
--- a/examples/dual/dynamic_switch/src/tusb_config.h
+++ b/examples/dual/dynamic_switch/src/tusb_config.h
@@ -129,7 +129,8 @@ extern "C" {
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
-// CDC Endpoint transfer buffer size, more is faster
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
diff --git a/examples/dual/host_hid_to_device_cdc/src/tusb_config.h b/examples/dual/host_hid_to_device_cdc/src/tusb_config.h
index 0a7137d29..fb2a401b5 100644
--- a/examples/dual/host_hid_to_device_cdc/src/tusb_config.h
+++ b/examples/dual/host_hid_to_device_cdc/src/tusb_config.h
@@ -114,7 +114,8 @@
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
-// CDC Endpoint transfer buffer size, more is faster
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
diff --git a/examples/dual/host_info_to_device_cdc/src/tusb_config.h b/examples/dual/host_info_to_device_cdc/src/tusb_config.h
index 8f3ed6357..99e9315a4 100644
--- a/examples/dual/host_info_to_device_cdc/src/tusb_config.h
+++ b/examples/dual/host_info_to_device_cdc/src/tusb_config.h
@@ -114,7 +114,8 @@
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 256)
 
-// CDC Endpoint transfer buffer size, more is faster
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
diff --git a/src/class/cdc/cdc_device.c b/src/class/cdc/cdc_device.c
index 3f207462e..c7547c92b 100644
--- a/src/class/cdc/cdc_device.c
+++ b/src/class/cdc/cdc_device.c
@@ -356,7 +356,7 @@ uint16_t cdcd_open(uint8_t rhport, const tusb_desc_interface_t* itf_desc, uint16
         } else {
           tu_edpt_stream_t *stream_rx = &p_cdc->rx_stream;
           tu_edpt_stream_open(stream_rx, rhport, desc_ep,
-                              _cdcd_cfg.rx_need_zlp ? CFG_TUD_CDC_RX_EPSIZE : tu_edpt_packet_size(desc_ep));
+                              CFG_TUD_CDC_RX_NEED_ZLP ? CFG_TUD_CDC_RX_EPSIZE : tu_edpt_packet_size(desc_ep));
           if (!_cdcd_cfg.rx_persistent) {
             tu_edpt_stream_clear(stream_rx);
           }
diff --git a/src/class/cdc/cdc_device.h b/src/class/cdc/cdc_device.h
index 3baf84d00..0348bd2ec 100644
--- a/src/class/cdc/cdc_device.h
+++ b/src/class/cdc/cdc_device.h
@@ -65,13 +65,17 @@
   #endif
 #endif
 
+// Enable multi-packet RX transfer with ZLP termination for better throughput. Requires host support for ZLP.
+#ifndef CFG_TUD_CDC_RX_NEED_ZLP
+  #define CFG_TUD_CDC_RX_NEED_ZLP 0
+#endif
+
 #ifndef CFG_TUD_CDC_CONFIGURE_DEFAULT
   #define CFG_TUD_CDC_CONFIGURE_DEFAULT()       \
   {                                           \
   .rx_persistent                   = false, \
   .tx_persistent                   = false, \
   .tx_overwritabe_if_not_connected = true,  \
-  .rx_need_zlp                     = false  \
   }
 #endif
 
@@ -82,7 +86,6 @@ typedef struct {
   bool rx_persistent; // keep rx fifo data even with bus reset or disconnect
   bool tx_persistent; // keep tx fifo data even with reset or disconnect
   bool tx_overwritabe_if_not_connected; // if not connected, tx fifo can be overwritten
-  bool rx_need_zlp; // requires host support ZLP, allow transfer more than one packet in a single transfer, better throughput.
 } tud_cdc_configure_t;
 
 // Configure CDC driver behavior
diff --git a/src/class/vendor/vendor_device.c b/src/class/vendor/vendor_device.c
index c55cad627..e1017ba48 100644
--- a/src/class/vendor/vendor_device.c
+++ b/src/class/vendor/vendor_device.c
@@ -71,8 +71,6 @@ typedef struct {
 CFG_TUD_MEM_SECTION static vendord_epbuf_t _vendord_epbuf[CFG_TUD_VENDOR];
 #endif
 
-static tud_vendor_configure_t _vendord_cfg = CFG_TUD_VENDOR_CONFIGURE_DEFAULT();
-
 //--------------------------------------------------------------------+
 // Weak stubs: invoked if no strong implementation is available
 //--------------------------------------------------------------------+
@@ -87,15 +85,6 @@ TU_ATTR_WEAK void tud_vendor_tx_cb(uint8_t idx, uint32_t sent_bytes) {
   (void) sent_bytes;
 }
 
-//--------------------------------------------------------------------
-// Application API
-//--------------------------------------------------------------------
-bool tud_vendor_configure(const tud_vendor_configure_t* driver_cfg) {
-  TU_VERIFY(driver_cfg != NULL);
-  _vendord_cfg = *driver_cfg;
-  return true;
-}
-
 bool tud_vendor_n_mounted(uint8_t idx) {
   TU_VERIFY(idx < CFG_TUD_VENDOR);
   vendord_interface_t *p_itf = &_vendord_itf[idx];
@@ -307,7 +296,7 @@ uint16_t vendord_open(uint8_t rhport, const tusb_desc_interface_t *desc_itf, uin
       const tusb_desc_endpoint_t* desc_ep = (const tusb_desc_endpoint_t*) p_desc;
       TU_ASSERT(usbd_edpt_open(rhport, desc_ep));
 
-      uint16_t rx_xfer_len = _vendord_cfg.rx_need_zlp ? CFG_TUD_VENDOR_RX_EPSIZE : tu_edpt_packet_size(desc_ep);
+      uint16_t rx_xfer_len = CFG_TUD_VENDOR_RX_NEED_ZLP ? CFG_TUD_VENDOR_RX_EPSIZE : tu_edpt_packet_size(desc_ep);
 
   #if CFG_TUD_VENDOR_TXRX_BUFFERED
       // open endpoint stream
diff --git a/src/class/vendor/vendor_device.h b/src/class/vendor/vendor_device.h
index 491a7d7fb..28accc698 100644
--- a/src/class/vendor/vendor_device.h
+++ b/src/class/vendor/vendor_device.h
@@ -74,24 +74,11 @@ extern "C" {
   #define CFG_TUD_VENDOR_RX_MANUAL_XFER 0
 #endif
 
-//--------------------------------------------------------------------+
-// Driver Configuration
-//--------------------------------------------------------------------+
-typedef struct TU_ATTR_PACKED {
-  bool rx_need_zlp : 1; // requires host support ZLP, allow transfer more than one packet in a single transfer, better throughput.
-} tud_vendor_configure_t;
-TU_VERIFY_STATIC(sizeof(tud_vendor_configure_t) == 1, "size is not correct");
-
-#ifndef CFG_TUD_VENDOR_CONFIGURE_DEFAULT
-  #define CFG_TUD_VENDOR_CONFIGURE_DEFAULT() \
-    {                                    \
-      .rx_need_zlp = false,              \
-    }
+// Enable multi-packet RX transfer with ZLP termination for better throughput. Requires host support for ZLP.
+#ifndef CFG_TUD_VENDOR_RX_NEED_ZLP
+  #define CFG_TUD_VENDOR_RX_NEED_ZLP 0
 #endif
 
-// Configure CDC driver behavior
-bool tud_vendor_configure(const tud_vendor_configure_t* driver_cfg);
-
 //--------------------------------------------------------------------+
 // Application API (Multiple Interfaces) i.e CFG_TUD_VENDOR > 1
 //--------------------------------------------------------------------+
diff --git a/test/fuzz/device/cdc/src/tusb_config.h b/test/fuzz/device/cdc/src/tusb_config.h
index b4b45d798..14b7b627d 100644
--- a/test/fuzz/device/cdc/src/tusb_config.h
+++ b/test/fuzz/device/cdc/src/tusb_config.h
@@ -101,7 +101,8 @@
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
-// CDC Endpoint transfer buffer size, more is faster
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
diff --git a/test/fuzz/device/msc/src/tusb_config.h b/test/fuzz/device/msc/src/tusb_config.h
index 3400c141d..7a4a24fb8 100644
--- a/test/fuzz/device/msc/src/tusb_config.h
+++ b/test/fuzz/device/msc/src/tusb_config.h
@@ -101,7 +101,8 @@
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
-// CDC Endpoint transfer buffer size, more is faster
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
diff --git a/test/fuzz/device/net/src/tusb_config.h b/test/fuzz/device/net/src/tusb_config.h
index 46fc10cdb..de45e9ead 100644
--- a/test/fuzz/device/net/src/tusb_config.h
+++ b/test/fuzz/device/net/src/tusb_config.h
@@ -106,7 +106,8 @@
 #define CFG_TUD_CDC_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
-// CDC Endpoint transfer buffer size, more is faster
+// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
+// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
 #define CFG_TUD_CDC_RX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)
 #define CFG_TUD_CDC_TX_EPSIZE  (TUD_OPT_HIGH_SPEED ? 512 : 64)