TMS320C6655: The first Ethernet Frame is not captured by the Wireshark

Chunhua Ni

Part Number: TMS320C6655

Hello,

Development Environment: CCS5.5, Win11 64 bits

HW Environment: C6655+PHY 88E1112 is connected to a 10M/100M network adaptor installed on PC. Wireshark captures the traffic on the network.

Issue: When the DSP transmits the Ethernet Frames via Channel 0, Wireshark does not capture the first Ethernet Frame only. However, bit 0 in TXINTSTATRAW register is set.

Investigation: During the initiation, SGMII mode is reported as 100M in Full duplex, the link is up in MR_LP_ADV_ABILITY register. I initiated EMAC registers as well as the Transmit Buffer Descriptor, and write the TX HDP0 with the pointer to the Transmit Buffer Descriptor. Bit 0 in TXINTSTATRAW register is set, however, Wireshark does not capture this frame. If I repeat writing the TX HDP0 with the pointer to the Transmit Buffer Descriptor (Owner is set), the succeeding frames are captured by Wireshark successfully.

I think the EMAC has send out the first Ethernet frame successfully since bit 0 in TXINTSTATRAW register is set. But it is confused that why does Wireshark fail to catpure this frame?

MAC Control Register is configured by setting the following fields to 1:

EXT_EN,
TX_PTYPE
GMII_EN
FULLDUPLEX

Please TI experts provide some advice why does this sympton happen? Note: CSL is not used in the development.

over 2 years ago

0 Ranjeet Kumar over 2 years ago

TI__Intellectual 870 points

Hi Chunhua Ni,

Will provide the solution to your query ASAP.

Thanks

0 Chunhua Ni over 2 years ago in reply to Ranjeet Kumar

Prodigy 80 points

Hello Ranjeet,

I am not sure whether we can get some clues from the thread via the link below.

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/686161/tms570ls3137-emac-module-is-initialized-but-no-packets-are-sent/2537603?tisearch=e2e-sitesearch&keymatch=EMAC%252525252520idle#2537603

Thanks.

0 Ranjeet Kumar over 2 years ago in reply to Chunhua Ni

TI__Intellectual 870 points

Hi Chunhua Li

From my side, I can confirm from the CCS (code composer studio), whether we can get the details of the registers.

But, From Wireshark's point of view, we could not confirm whether it is a bug in the software. In the processor forum, we could not provide support for external tools like Wireshark.

Thanks,

0 Ranjeet Kumar over 2 years ago in reply to Ranjeet Kumar

TI__Intellectual 870 points

Hi Chunhua Li

From the Memory map, I can confirm that I can read the register value at 0x02C08080 as "0" in all 8 bits in LSB. TXINTSTATRAW register value set at 0

Thanks,

0 Chunhua Ni over 2 years ago in reply to Ranjeet Kumar

Prodigy 80 points

Hello Ranjeet,

When the first Ethernet frame is send out, bit 0 in TXINTSTATRAW is set, and Statistics Register TXGOODFRAMES is increased by one (from 0 to 1). The behavior is correct.

I did another test on a National Instrument Ethernet card and with customized tool, first frame is captured successfully. Therefore, the root cause may be the wireshark together with adaptor.

Thanks for your effort.

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TMS320C6655: The first Ethernet Frame is not captured by the Wireshark