On 15.02.2018 16:05, Stephan Hilchenbach wrote:
Hello Experts,
I have a problem with my Ethernet driver connecting a Ti AM335x CPSW
switch to the LwIP stack v1.4.1.
1.4.1 is rather old. There have been numerous bugs fixed since then.
The port stops transmitting after some minutes or hours. The DMA
hardware register shows no errors but the transmission stalled. The
DMA does not process further packets, but the content of the next
packets looks OK.
When I run Wireshark I observe always the same sequence. Every time
before the port stops transmission, the last packet sent was an ARP
broadcast to the connected host "TexasIns_e4:2a:20 Broadcast ARP Who
has 192.168.1.31? Tell 192.168.1.211". Curiously this is the only time
the LwIP generates this request after connection was established.
There are no other ARP broadcasts until the Tx stall. Attached is a
screenshot.
A screenshot? WTF? If this is a screenshot of a wireshark log, please
attach a pcap file instead.
I have two questions about this:
1. What is the reason for the LwIP to generate this ARP broadcast
during transmission?
Don't know. Attach a pcap including an explanation of which IPs we see,
which device has which address and what they do. I'm too lazy to try to
find that out myself. And I could be wrong.
2. Can the LwIP cause a hardware Tx port to stall (because of the
packet content)?
No. In general, lwIP has *nothing* to do with your hardware. The netif
driver is responsible for that.
Simon
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