Reformat NCM class.

src/class/net/ncm.h

@@ -25,58 +25,59 @@
  * This file is part of the TinyUSB stack.
  */
 
-
 #ifndef _TUSB_NCM_H_
 #define _TUSB_NCM_H_
 
 #include "common/tusb_common.h"
-#include "lwipopts.h"
 
-#ifndef CFG_TUD_NCM_IN_NTB_MAX_SIZE
+// NTB buffers size for reception side, must be >> MTU to avoid TCP retransmission (driver issue ?)
-    #define CFG_TUD_NCM_IN_NTB_MAX_SIZE             (2 * TCP_MSS + 100)
+// Linux use 2048 as minimal size
-#endif
 #ifndef CFG_TUD_NCM_OUT_NTB_MAX_SIZE
-    #define CFG_TUD_NCM_OUT_NTB_MAX_SIZE            (2 * TCP_MSS + 100)
+  #define CFG_TUD_NCM_OUT_NTB_MAX_SIZE 3200
 #endif
 
+// NTB buffers size for reception side, must be > MTU
+// Linux use 2048 as minimal size
+#ifndef CFG_TUD_NCM_IN_NTB_MAX_SIZE
+  #define CFG_TUD_NCM_IN_NTB_MAX_SIZE 3200
+#endif
+
+// Number of NTB buffers for reception side
+// Depending on the configuration, this parameter could be increased with the cost of additional RAM requirements
+// On Full-Speed (RP2040) :
+//    1  - good performance
+//    2  - up to 30% more performance with iperf with small packets
+//    >2 - no performance gain
+// On High-Speed (STM32F7) :
+//    No performance gain
 #ifndef CFG_TUD_NCM_OUT_NTB_N
-    /// number of NTB buffers for reception side
-    ///    1  - good performance
-    ///    2  - up to 30% more performance with iperf with small packets
-    ///    >2 - no performance gain
-    /// -> for performance optimizations this parameter could be increased with the cost of additional RAM requirements
   #define CFG_TUD_NCM_OUT_NTB_N 1
 #endif
 
+// Number of NTB buffers for transmission side
+// Depending on the configuration, this parameter could be increased with the cost of additional RAM requirements
+// On Full-Speed (RP2040) :
+//    1 - good performance but SystemView shows lost events (on load test)
+//    2 - up to 50% more performance with iperf with small packets, "tud_network_can_xmit: request blocked"
+//        happens from time to time with SystemView
+//    3 - "tud_network_can_xmit: request blocked" never happens
+//    >3 - no performance gain
+// On High-Speed (STM32F7) :
+//    No performance gain
 #ifndef CFG_TUD_NCM_IN_NTB_N
-    /// number of NTB buffers for transmission side
-    ///    1 - good performance but SystemView shows lost events (on load test)
-    ///    2 - up to 50% more performance with iperf with small packets, "tud_network_can_xmit: request blocked"
-    ///        happens from time to time with SystemView
-    ///    3 - "tud_network_can_xmit: request blocked" never happens
-    ///    >2 - no performance gain
-    /// -> for performance optimizations this parameter could be increased with the cost of additional RAM requirements
   #define CFG_TUD_NCM_IN_NTB_N 1
 #endif
 
+// How many datagrams it is allowed to put into an NTB for transmission side
 #ifndef CFG_TUD_NCM_IN_MAX_DATAGRAMS_PER_NTB
-    /// this is for the transmission side for allocation of \a ndp16_datagram_t
   #define CFG_TUD_NCM_IN_MAX_DATAGRAMS_PER_NTB 8
 #endif
 
+// This tells the host how many datagrams it is allowed to put into an NTB
 #ifndef CFG_TUD_NCM_OUT_MAX_DATAGRAMS_PER_NTB
-    /// this tells the host how many datagrams it is allowed to put into an NTB
   #define CFG_TUD_NCM_OUT_MAX_DATAGRAMS_PER_NTB 6
 #endif
 
-#ifndef CFG_TUD_NCM_ALIGNMENT
-    #define CFG_TUD_NCM_ALIGNMENT                   4
-#endif
-#if (CFG_TUD_NCM_ALIGNMENT != 4)
-    #error "CFG_TUD_NCM_ALIGNMENT must be 4, otherwise the headers and start of datagrams have to be aligned (which they are currently not)"
-#endif
-
-
 // Table 6.2 Class-Specific Request Codes for Network Control Model subclass
 typedef enum
 {
@@ -98,7 +99,6 @@ typedef enum
   NCM_SET_CRC_MODE                                 = 0x8A,
 } ncm_request_code_t;
 
-
 #define NTH16_SIGNATURE 0x484D434E
 #define NDP16_SIGNATURE_NCM0 0x304D434E
 #define NDP16_SIGNATURE_NCM1 0x314D434E
@@ -160,5 +160,4 @@ struct ncm_notify_t {
   uint32_t downlink, uplink;
 };
 
-
 #endif