CCS/RM48L952: EMACCore0RxIsr hang issue on RM48x-HDK.

WTMEC_Will Hsu

Part Number: RM48L952
Other Parts Discussed in Thread: TMDSRM48HDK

Tool/software: Code Composer Studio

Hi TI team

I'm testing ethernet function using lwIP_Demo_v03 on RM48x-HDK.
the lwIP demo is working fine.

When I use UDP test tool (NetMi.exe) to attack the ethernet port, EMACCore0RxIsr was not wotking.
How to fix EMACCore0RxIsr hang issue?
Thanks a million.

--> Hercules RM48x Development Kit (TMDSRM48HDK)
www.ti.com/.../tmdsrm48hdk

--> lwIP_Demo_v03
processors.wiki.ti.com/.../HALCoGen_Ethernet_Driver_and_lwIP_Integration_Demonstration

--> UDP test tool (NetMi.exe)
www.dropbox.com/.../NetMi.zip

--> lwip_main.c
/*
** Interrupt Handler for Core 0 Receive interrupt
*/
volatile int countEMACCore0RxIsr = 0;
#pragma INTERRUPT(EMACCore0RxIsr, IRQ)
void EMACCore0RxIsr(void)
{
countEMACCore0RxIsr++;
lwIPRxIntHandler(0);
}

--> Console log
HERCULES MICROCONTROLLERS
Texas Instruments
Big Endian device
Initializing ethernet (DHCP)
DEBUG - Getting PHY ID....SUCCESS
DEBUG - Getting PHY Alive Status...SUCCESS
DEBUG - Getting PHY Link Status...SUCCESS
DEBUG - Setting up Link...SUCCESS
..DONE
Starting Web Server..DONE

HERCULES MICROCONTROLLERS
Texas Instruments
Big Endian device
Device IP Address: 192.168.123.142
Webserver accessible @ http:\\192.168.123.142

over 6 years ago

0 Chuck Davenport over 6 years ago

TI__Guru 59540 points

Hello Will,

Note that the LwiP code is open source code that we have adapted to Hercules for the demo. We do not technically support this code base since it is 3rd party. With that stated, we can try to give some pointers. You mentioned that you are attacking the port using UDP? What is the nature of the attack and what is the intended result? What is the data rate you are using that causes the hang?

0 WTMEC_Will Hsu over 6 years ago in reply to Chuck Davenport

Expert 2620 points

Hi Chuck

Thank you for your response.

You mentioned that you are attacking the port using UDP?
[Will] : User Datagram Protocol floods.
en.wikipedia.org/.../UDP_flood_attack

What is the nature of the attack and what is the intended result?
[Will] : I need to prevent Distributed DoS attacks.

Distributed DoS attack
en.wikipedia.org/.../Denial-of-service_attack

What is the data rate you are using that causes the hang?
[Will] : 85Mbps

Please give some pointers.

Thanks a million.

From Will Hsu

0 Chuck Davenport over 6 years ago in reply to WTMEC_Will Hsu

TI__Guru 59540 points

Hello Will,

I will have one of my colleagues have a look as I think he has also dealt with some issues similar to this in the past.

0 WTMEC_Will Hsu over 6 years ago in reply to Chuck Davenport

Expert 2620 points

Hi Chuck
Any update about the issues?
Thanks.

0 QJ Wang over 6 years ago in reply to WTMEC_Will Hsu

TI__Guru**** 186196 points

Hello James,

Have you define your own UDP function to receive any message from your UDP tool?

for example:

udpc = udp_new()
udp_blind(udpc, ip_addr, port_number);
udp_recv(udpc, &your_udp_rx_function, ..)

0 WTMEC_Will Hsu over 6 years ago in reply to QJ Wang

Expert 2620 points

Hi QJ Wang
I didn't modify any code.
You mean is that I can avoid Dos attack using your example.
If EMACCore0RxIsr has hang up, how to restart it?

0 WTMEC_Will Hsu over 6 years ago in reply to WTMEC_Will Hsu

Expert 2620 points

Hi, QJ

I've tested ethernet port using TCP packet with packETH tool.

if TCP packet delay between 50us, EMACCore0RxIsr is working fine.

if TCP packet delay between 40us, EMACCore0RxIsr will stop working.

Please get me some help. thanks.

TCP packet detail : ping_packet_data56.pcap6518.ping_packet_data56.zip

0 QJ Wang over 6 years ago in reply to WTMEC_Will Hsu

TI__Guru**** 186196 points

Hello WIll,

Can you toggle one GIO pin to measure how long the RX ISR takes?

void EMACCore0RxIsr(void)

{

countEMACCore0RxIsr++;

gioToggleBit(gioPORTA, 1);

lwIPRxIntHandler(0);

gioToggleBit(gioPORTA, 1);

}

0 FelixHsieh over 6 years ago in reply to QJ Wang

Prodigy 80 points

HI, QJ

As attached

Normal packet

Storm packet

Thanks a lot.

Thanks and Regards,
Felix Hsieh

0 QJ Wang over 6 years ago in reply to FelixHsieh

TI__Guru**** 186196 points

Hi Felix,

Is the packet used for storm test the same as for the normal test? How long does the ISR take? is it almost 40us?

0 FelixHsieh over 6 years ago in reply to QJ Wang

Prodigy 80 points

Hi, QJ:

Is the packet used for storm test the same as for the normal test?

ans: yes

How long does the ISR take?

ans: almost 40us.

Thanks and Regards,
Felix Hsieh

0 QJ Wang over 6 years ago in reply to FelixHsieh

TI__Guru**** 186196 points

Hi Felix,

The LWIP is interrupt based, it doesn't use the any timer. The EMAC generates interrupts, LWIP processes the packet and sends to the application. When the interval of the coming packets is shorter than the CPU processing time, the RX FIFO over error occurs. The code will hang up.

Arm-based microcontrollers

Arm-based microcontrollers forum

CCS/RM48L952: EMACCore0RxIsr hang issue on RM48x-HDK.