TDA2SX: TCP ACK error

caojingu cao

Prodigy 20 points

Part Number: TDA2SX

Tool/software:

In recent days, we found an un-correct behavior about TDA2S's TCP protocol.

Please have a look of upper picture and let me elaborate the issue.

The IP address 172.16.2.92 represents TDA2S.

Our Soc linux kernal is 4.4.97 and Soc SDK version is 03.07

At #606880, Other node sent last PDU segment to TDA2S, the seq=119164610 and legth = 220.

So at TDA2S, we should expect one ACK with value is 119164610+220=119164830.

But from wireshark log we can find that finally we didn't get that.

So I think this is an issue.

2 months ago

0 Tanmay Patil 2 months ago

TI__Mastermind 27290 points

Hi,

Can you compare this with the capture on the SoC side (use tcpdump -i $IFNAME -w tda2s_capture.pcap)?

This would let us know if there are some drops in hardware for this or not.

Regards,
Tanmay

0 caojingu cao 2 months ago

Prodigy 20 points

Hello, I think it is not applicable to run tcpdump on the real vehicle.

This log is captured by Vector VN5650 and I think this instrument is reliable.

0 caojingu cao 2 months ago in reply to Tanmay Patil

Prodigy 20 points

Hello, I think it is not applicable to run tcpdump on the real vehicle.

This log is captured by Vector VN5650 and I think this instrument is reliable.

0 Tanmay Patil 2 months ago in reply to caojingu cao

TI__Mastermind 27290 points

Hi,

What I wanted to check here is that if the linux on TAD2 received the packet or not. The comparison between both dumps will give us the information on what is going on in the hardware.

In this type of network, it won't be helpful to gauge hardware behaviour using the statistics.

Regards,
Tanmay

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TDA2SX: TCP ACK error