AM335x CPSW port mirroring

Andrey K.

Is there any way to enable port mirroring on CPSW? I want to snif network traffic an AM335x and I meet issue with CPSW - it is transfer only unicast packets that addressed to AM335x host and ignore all other packets.

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Andrey,

Do you mean that you need all packets that are received on one port to be transferred to the other port AND to the CPU?

0 Andrey K. over 10 years ago in reply to Biser Gatchev-XID

Prodigy 50 points

Ideally yes. If this is not possibly I can replace dual-port PHY with external three-port switch with full support of port mirroring (KSZ8863 for example). But in this case I still need to receive all packets from MII_1 of AM335x.

0 Schuyler Patton over 10 years ago in reply to Andrey K.

TI__Mastermind 34795 points

We are trying to test this capability. Do you have the am335x EVM-SK board?

0 Andrey K. over 10 years ago in reply to Schuyler Patton

Prodigy 50 points

No I have only BeagleBone and my own custom board based on Axonim MTAX-SOM-AM3354 module.

0 Andrey K. over 9 years ago in reply to Schuyler Patton

Prodigy 50 points

Hey! Are you found any solution? Or can you say, that this is not possibly?

0 Michael D. over 9 years ago in reply to Andrey K.

Prodigy 20 points

I am also trying to do this. Is it possible?

0 Andrey K. over 9 years ago in reply to Michael D.

Prodigy 50 points

Looks like no, this is not possibly both for AM335x and for new AM473x. This is very interesting CPUs with good SDK but fully not usably in my project. =(

0 Michael D. over 9 years ago in reply to Andrey K.

Prodigy 20 points

Done some more digging.

In April 2012 Mugunthan (a TI employee at the time - possibly still) says that CPSW doesn't support this feature (at least on TI814X). On being pressed further, it seems like the hardware isn't really geared up for it and the software driver doesn't (at the time) support the feature, but in theory it could be possible:

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/183933.aspx

In January 2014, Mugunthan submits a patch that appears to add at least partial support:

http://www.spinics.net/lists/linux-omap/msg102618.html

It appears here too, but with an older date:

https://gitorious.org/am335x/linux-am33x/commit/a867d485bc895237d5690ec6ba3e536ce2796200

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AM335x CPSW port mirroring