RTCS DHCP Server Problem with MQX 4.2.0.2

[icelee]

hello

I'm using MQX 4.2.0.2 DHCP Server on FRDM-K64F.

Sometimes DHCP Server can't receive discover/request packet after boot.

I added log at function DHCPSRV_task() in rtcs/source/apps/dhcpsrv.c

It seems that when problem occurred, select() cannot out itself.

Could anyone help me with this?

Thanks.

[icelee · Accepted solution]

Forget to say, I'm also using NAT of RTCS.

And i found the reason of mem_alloc fail.

[reason]

In NAT_init_internal2() of rtcs\source\nat\nat.c,
Nat session use RTCS_part_create( PARTITION ALLOC ?) to get memory.

-----------------------------------------------------------------------------------------------------
nat_cfg_ptr->SESSION_PART = RTCS_part_create(sizeof(NAT_SESSION_STRUCT),
 NAT_SESSION_INITIAL_COUNT, NAT_SESSION_GROW_COUNT, NAT_SESSION_MAX, NULL, NULL);

_rtcs_part RTCS_part_create
   (
      uint32_t size,                       /* [IN] size of one block */
      uint32_t init,                       /* [IN] initial number of blocks */
      uint32_t grow,                       /* [IN] number of blocks to grow by */
      uint32_t max,                        /* [IN] maximum number of blocks */
      int32_t (_CODE_PTR_ cons)(void *),  /* [IN] block constructor */
      int32_t (_CODE_PTR_ dest)(void *)   /* [IN] block destroyer */
   )
-----------------------------------------------------------------------------------------------------

Pay attention, the argument "max" of RTCS_part_create funtion is setted by NAT_SESSION_MAX.
But the value define of NAT_SESSION_MAX is 0 !!!

When "max" is 0, it will get memory without limit.
That's why i found RTCS_mem_alloc_system failed in UDP_process().

[Solution]

・Freescale_MQX_4_2\rtcs\source\include\nat_prv.h
  change the value of NAT_SESSION_MAX to 1024
  #define NAT_SESSION_MAX             1024

・Freescale_MQX_4_2\rtcs\source\nat\natftp.c
　 the argument "max" of RTCS_part_create setted with NAT_SESSION_MAX.

・Freescale_MQX_4_2\rtcs\source\include\rtcscfg.h
  add the define below
    #define IPROUTEALLOC_SIZE_MAX 256
    #define IPGATEALLOC_SIZE_MAX 256
    #define IPMCBALLOC_SIZE_MAX 256
    #define RADIXALLOC_SIZE_MAX 256

・Freescale_MQX_4_2\rtcs\source\tcpip\ip.c
　 the argument "max" of RTCS_part_create functions setted with above definition.

Now DHCP server runs well about one week.
And the changes seems good.

Does someone has some experience of NAT session(NAT_SESSION_MAX) about RTCS_part_create?
Thanks.

[icelee]

I found the reason about this problem.

In the function UDP_process() (Freescale_MQX_4_2\rtcs\source\tcpip\udp.c),

before SOCK_select_signal() called, RTCS_mem_alloc_system() was failed.

And mem_alloc fail keep going on.

It seems that memory leak occurred.

Could anyone give me some guidance ?

Thanks.