LwIP on STM32MP135 FreeRTOS bare-metal

[Sxx]

Hello everyone.

I'm working on a bare metal project for STM32MP135D using FreeRTOS (V10.6.2) and LwIP (V2.1.0).

I write a custom TCP server that work together with a custom UDP client. Both this use raw API.

I'm experimenting strange problems:

sometime the TCP server not ack the respective client or not provide resoinse to it.

I've notice that if putting around tcp_output() and udp_send() a LOCK_TCPIP_CORE/UNLOCK_TCPIP_CORE  the problem seems disappear.

You think there is a problem on this LwIP implementation or in my lwipopts.h settings?

At follow my "lwipopts.h"

Thanks in advance for your help

#ifndef __LWIPOPTS_H__
#define __LWIPOPTS_H__

/**
* NO_SYS==1: Provides VERY minimal functionality. Otherwise,
* use lwIP facilities.
*/
#define NO_SYS 0

/* ---------- Memory options ---------- */
/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
byte alignment -> define MEM_ALIGNMENT to 2. */
#define MEM_ALIGNMENT 4

/* MEM_SIZE: the size of the heap memory. If the application will send
a lot of data that needs to be copied, this should be set high. */
#define MEM_SIZE (30*1024)

/* Relocate the LwIP RAM heap pointer */
extern unsigned char memp_memory_LWIP_HEAP_RAM_base[];
#define LWIP_RAM_HEAP_POINTER (&memp_memory_LWIP_HEAP_RAM_base[0])

/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
connections. */
#define MEMP_NUM_TCP_PCB 10

/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
segments. */
#define MEMP_NUM_TCP_SEG TCP_SND_QUEUELEN

/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool.
@ note: used to allocate Tx pbufs only */

/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
#define PBUF_POOL_BUFSIZE 1536

/* LWIP_SUPPORT_CUSTOM_PBUF == 1: to pass directly MAC Rx buffers to the stack
no copy is needed */
#define LWIP_SUPPORT_CUSTOM_PBUF 1

/* ---------- IPv4 options ---------- */
#define LWIP_IPV4 1

/* ---------- TCP options ---------- */
#define LWIP_TCP 1
#define TCP_TTL 255

/* Controls if TCP should queue segments that arrive out of
order. Define to 0 if your device is low on memory. */

/* TCP Maximum segment size. */
#define TCP_MSS (1500 - 40) /* TCP_MSS = (Ethernet MTU - IP header size - TCP header size) */

/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF (4*TCP_MSS)

/* TCP receive window. */
#define TCP_WND (4*TCP_MSS)

/* ---------- ICMP options ---------- */
#define LWIP_ICMP 1

/* ---------- DHCP options ---------- */
#define LWIP_DHCP 1

/* ---------- UDP options ---------- */
#define LWIP_UDP 1
#define UDP_TTL 255

/* ---------- Statistics options ---------- */
#define LWIP_STATS 0

/* ---------- link callback options ---------- */
/* LWIP_NETIF_LINK_CALLBACK==1: Support a callback function from an interface
* whenever the link changes (i.e., link down)
*/
#define LWIP_NETIF_LINK_CALLBACK 1

/*
--------------------------------------
---------- Checksum options ----------
--------------------------------------
*/

/*
The STM32H7xx allows computing and verifying the IP, UDP, TCP and ICMP checksums by hardware:
- To use this feature let the following define uncommented.
- To disable it and process by CPU comment the the checksum.
*/
#define CHECKSUM_BY_HARDWARE

#ifdef CHECKSUM_BY_HARDWARE
/* CHECKSUM_GEN_IP==0: Generate checksums by hardware for outgoing IP packets.*/
#define CHECKSUM_GEN_IP 0
/* CHECKSUM_GEN_UDP==0: Generate checksums by hardware for outgoing UDP packets.*/
#define CHECKSUM_GEN_UDP 0
/* CHECKSUM_GEN_TCP==0: Generate checksums by hardware for outgoing TCP packets.*/
#define CHECKSUM_GEN_TCP 0
/* CHECKSUM_CHECK_IP==0: Check checksums by hardware for incoming IP packets.*/
#define CHECKSUM_CHECK_IP 0
/* CHECKSUM_CHECK_UDP==0: Check checksums by hardware for incoming UDP packets.*/
#define CHECKSUM_CHECK_UDP 0
/* CHECKSUM_CHECK_TCP==0: Check checksums by hardware for incoming TCP packets.*/
#define CHECKSUM_CHECK_TCP 0
/* CHECKSUM_GEN_ICMP==1: Check checksums by hardware for outgoing ICMP packets.*/
/* Hardware TCP/UDP checksum insertion not supported when packet is an IPv4 fragment */
#define CHECKSUM_GEN_ICMP 1
/* CHECKSUM_CHECK_ICMP==0: Check checksums by hardware for incoming ICMP packets.*/
#define CHECKSUM_CHECK_ICMP 0

#else
/* CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.*/
#define CHECKSUM_GEN_IP 1
/* CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.*/
#define CHECKSUM_GEN_UDP 1
/* CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.*/
#define CHECKSUM_GEN_TCP 1
/* CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.*/
#define CHECKSUM_CHECK_IP 1
/* CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.*/
#define CHECKSUM_CHECK_UDP 1
/* CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.*/
#define CHECKSUM_CHECK_TCP 1
/* CHECKSUM_GEN_ICMP==1: Check checksums by hardware for outgoing ICMP packets.*/
#define CHECKSUM_GEN_ICMP 1
/* CHECKSUM_CHECK_ICMP==1: Check checksums by hardware for incoming ICMP packets.*/
#define CHECKSUM_CHECK_ICMP 1
#endif

/*
----------------------------------------------
---------- Sequential layer options ----------
----------------------------------------------
*/
/**
* LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
*/
#define LWIP_NETCONN 0

/*
------------------------------------
---------- Socket options ----------
------------------------------------
*/
/**
* LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
*/
#define LWIP_SOCKET 0

/*
---------------------------------
---------- OS options ----------
---------------------------------
*/

#define TCPIP_THREAD_NAME "TCP/IP"
#define TCPIP_THREAD_STACKSIZE 2048
#define TCPIP_MBOX_SIZE 6
#define DEFAULT_UDP_RECVMBOX_SIZE 6
#define DEFAULT_TCP_RECVMBOX_SIZE 6
#define DEFAULT_ACCEPTMBOX_SIZE 6
#define DEFAULT_THREAD_STACKSIZE 512
#define TCPIP_THREAD_PRIO osPriorityHigh
#define DEFAULT_THREAD_PRIO osPriorityNormal 

/*
---------------------------------
---------- CUSTOM options ----------
---------------------------------
*/
#define LWIP_SINGLE_NETIF 1 
#define MEMP_MEM_INIT 1 

#define ETHIF_NUM_RX_QUEUE_MSG 5
#define ETHIF_NUM_TX_QUEUE_MSG 5

#endif /* __LWIPOPTS_H__ */