AM335x Starter Kit Promiscous Mode

Kiros Yeh

Hi All

I have a issue about promiscous mode.

SDK : am335x-evm-sdk-src-06.00.00.00

Environment :

Step 1 : Enable both network interface eth0 and eth1.

Step 2 : Specify IP address with eth0. And I can ping a public IP via eth0.

Step 3 : Enable promiscous mode with eth0. ( ifconfig eth0 promisc)

Step 4 : Link down eth0 (ifconfig eth0 down).

Step 5 : For a while, enable eth0 again.( ifconfig eth0 up).

Now i can not ping a pubilc IP anymore. Both network interface can't work.

I have to link down eth1/eth0 and link up eth1/eth0 again.

If i don't enable promiscous mode with eth0 ( Skip step 3), everything is ok.

I don't modify any code about cpsw.

I think that maybe it's a bug of promiscous mode.

I found that driver will enable ALE_BYPASS mode when enable promiscous mode.

Anyone have idea?

Thanks

Kiros

0 Biser Gatchev-XID over 11 years ago

Here is a thread that discusses similar issues: http://e2e.ti.com/support/arm/sitara_arm/f/791/p/144193/620979.aspx

0 Kiros Yeh over 11 years ago in reply to Biser Gatchev-XID

Hi Biser

Thanks for your information.

In dual mac mode, if I want to receive all unicast packets, I need to enable bypass mode, right?

But when I enable ALE_BYPASS, there will be an issue that I said.

If i disable ALE_BYPASS, everything is ok.

But I can't receive all packets without ALE_BYPASS.

Thanks

Kiros

0 -DK- over 11 years ago in reply to Kiros Yeh

From a HW perspective, enabling ALE_BYPASS has the same effect as running in Dual-MAC mode: all packets are directed to port 0.

I'm not a SW expert so I can't comment on that portion of your question.

Processors forum