Re: [lwip-users] Network Loss causes network to go down

[Bomsta, Dan]

Thanks Trampas!  You went down the same road I started on with the ability to detect the disconnection.  I was told we cannot change the hardware, so I am trying to find the correct location in Lwip to “clean up” when there is no route.  Just haven’t found it yet.

 

The correct solution in using the carrier sense pin.

 

Thanks again,

Dan

 

From: lwip-users <lwip-users-bounces+dan.bomsta=address@hidden> On Behalf Of Trampas Stern
Sent: Tuesday, March 31, 2020 5:11 PM
To: Mailing list for lwIP users <address@hidden>
Subject: Re: [lwip-users] Network Loss causes network to go down

 

Dan,

 

I had been using a RMII phy and noticed similar issues.  Specifically I could not detect cable connected or disconnected using the RMII, the link activity bit does not work for cable connected/disconnected.  I was shocked to find that RMII did not provide this functionality.  Sure the LED blink but no bits in the RMII register map changes when cable is inserted or not. 

 

We had problems where it timeouts in setting up the netif/lwip  were causing watch dog time outs if cable was unplugged on boot. Then when cable was removed and reinserted (not a normal case for our device) we were having similar issues as you.  We could not find a way to know if the cable was connected or not, except by redesigning hardware.  So we are redesigning hardware to use hardware cable connection detection using PHY carrier sense pin.   The plan was try and shutdown lwip and restart netif and lwip when cable was plugged back in.  

 

Trampas

 

 

On Tue, Mar 31, 2020 at 5:51 PM Bomsta, Dan <address@hidden> wrote:

I have am working  on an issue with our device.  First here are the particulars

Micro:  STM32F427

LwIP: 2.0.3

WolfSSL: 3.15.3

Microchip managed switch KSZ8863RLLI.

 

If one removes the Ethernet cable from our device (typically during heavy traffic) the network is not usable for many minutes upon reconnecting the Ethernet cable.  I have been printing WolfSSL debug messages and Lwip debug messages without solving the issue yet.

 

No, we do not have the ability to “hardware” determine when the cable is unplugged.  Our system has these devices “daisy chained” so one would need to ping to determine if the network is available.  The last good trace I got is this (then my laptop crashed)

 

ip4_route: No route to 172.20.0.14

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: processing active pcb

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: processing active pcb

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: polling application

b

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

ip4_route: No route to 172.20.0.14

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

[512942] Link up? 0

tcp_slowtmr: processing active pcb

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: processing active pcb

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: polling application

b

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

ip4_route: No route to 172.20.0.14

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: processing active pcb

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: processing active pcb

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: polling application

b

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

ip4_route: No route to 172.20.0.14

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

[514966] Link up? 0

tcp_slowtmr: processing active pcb

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: processing active pcb

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: polling application

b

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

ip4_route: No route to 172.20.0.14

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: processing active pcb

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

[517070] Link up? 0

tcp_slowtmr: processing active pcb

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

tcp_slowtmr: polling application

b

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

ip4_route: No route to 172.20.0.14

data="">

=0x0)

sum)

4ac (0x14ac, 0x14ac, 0x64080000)

)

x64080000)

ac, 0x14ac, 0x64080000)

JSH˛ÓdĘÚ@¨0Ď$ü‡ouóćq

T

 

Any ideas would be greatly appreciated.

 

Dan

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