PROCESSOR-SDK-AM64X: Multicast Filter on AM64x-EVM PRU port

Milan Stevanovic

I am using ti-processor-sdk-linux-am64xx-evm-08.04.01.04 release for AM64x-EVM boards.

For testing multicast filtering, I am using PRU port ETH1 on both boards. I expected PRU to drop multicast packages if they are not in MC table.

But when I checked statistics I see number of frames increasing when I ping like example 224.0.0.5(01:00:5e:00:00:05) and this address is not in MC table.

Broadcast is disabled (sysctl net.ipv4.icmp_echo_ignore_broadcasts=0)

root@am64xx-evm:~# ethtool -S eth2 | grep multicast
rx_multicast_frames: 1954
tx_multicast_frames: 485

root@am64xx-evm:~# ethtool -S eth2 | grep multicast
rx_multicast_frames: 2059
tx_multicast_frames: 485

Is MAC filterring working? How I can confirm if MAC filtering is working?

over 1 year ago

0 Nick Saulnier over 1 year ago

TI__Guru 72515 points

Hello Milan,

My understanding was that multicast filtering was not supported as per https://software-dl.ti.com/processor-sdk-linux/esd/AM64X/08_04_01_04/exports/docs/linux/Foundational_Components/PRU-ICSS/Linux_Drivers/PRU_ICSSG_Ethernet.html#features-supported . I will double-check with the developers.

Regards,

Nick

0 Milan Stevanovic over 1 year ago in reply to Nick Saulnier

Intellectual 576 points

Hi Nick,

Thanks for response. Please if you could double check... But also, can you please check if this feature is planned and when

I will try to do same investigation on CPSW switch.. According doc this should be supported https://software-dl.ti.com/processor-sdk-linux/esd/AM64X/08_04_01_04/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/Network/CPSW3g.html#multi-mac-mode

Can you confirm also multicast support on CPSW

0 Nick Saulnier over 1 year ago in reply to Milan Stevanovic

TI__Guru 72515 points

Hello Milan,

Linux support for multicast filtering

I got confirmation that multicast filtering is not currently supported for Linux PRU Ethernet. I do not see any current requirements listed for multicast filtering for AM64x PRU Ethernet, so at this point in time I do not believe there is a planned timeframe.

CPSW multicast filtering

I would assume that CPSW supports multicast filtering based on some internal discussions I found, but I have not tried it myself at this point.

Does the PRU firmware itself currently support multicast filtering?

Support for PRU Ethernet multicast filtering was added to the firmware and TI-RTOS for PRU-ICSS devices (e.g., AM57x). However, I cannot find any documentation for whether support was added to the firmware and MCU+ drivers for PRU_ICSSG devices (e.g., AM64x, AM65x).

I am reassigning your thread to a PRU firmware team member who can comment on whether multicast filtering functionality currently exists in the PRU_ICSSG dual EMAC firmware.

Regards,

Nick

0 Nick Saulnier over 1 year ago in reply to Nick Saulnier

TI__Guru 72515 points

Hello Milan,

Apologies for the delayed response. I have reassigned your thread to another member of the firmware team. Please ping the thread if you do not have a response within the next couple of business days.

Regards,

Nick

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PROCESSOR-SDK-AM64X: Multicast Filter on AM64x-EVM PRU port