Linux DSA support for CPSW driver

reto hermann

Other Parts Discussed in Thread: DP83640

Dear all,

we are using the internal Ethernet switch of the AM3559 Processor together with two external PHYs (DP83640) and would like to have two logical Ethernet interfaces in Linux. The dual EMAC mode of the CPSW driver is no option for us, because we need the switch functionality and don't want to pass all the network traffic trough the software stack.

Linux supports an infrastructure (Distributed Network Architecture(DSA)) that allows to access the different ports of an external switch as multiple logical Ethernet ports.

Unfortunately, the CPSW Linux driver seems not to support this DSA mode.

Are there plans to add DSA-like functionality to the Linux CPSW driver ?
Is there anybody else, having the same problem ?

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

Hi Reto,

I will forward this to the Linux team.

0 Schuyler Patton over 11 years ago in reply to Biser Gatchev-XID

TI__Mastermind 40730 points

Could you provide an example of the logical network interfaces you need to have for your product? Or a block diagram of the topology you need?

0 reto hermann over 11 years ago in reply to Schuyler Patton

Intellectual 730 points

The hardware setup looks like this:

The aim of our application is to synchronize multiple daisy-chained devices using IEEE1588/PTP. This requires, that each devices behaves like a PTP Boundary Clock (BC) and that means that one Ethernet port acts as a PTP master the other as a PTP slave.

We plan to use the the open source LInux PTP project to implement the Boundary Clock. This project provides a daemon (ptp4l) that supports BC but requires two Ethernet interfaces, for example eth0 und eth1. So what we need is a driver, that represents the two physical ports (behind the switch) as two different interfaces in Linux. As far as I know this infrastructure is known as Distributed Switch Architecture (DSA)

There are drivers for some Marvell Semiconductor devices (see: http://lxr.free-electrons.com/source/drivers/net/dsa/) but since we use the internal switch of the AM335x we need a DSA-like extension of the CPSW driver.

Best regards

Reto

0 reto hermann over 11 years ago in reply to reto hermann

Intellectual 730 points

... is there any news ?

0 Antonio Pace over 9 years ago in reply to reto hermann

Prodigy 40 points

Hi all,

any news about this issue?

I have the same problem.

Antonio

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Linux DSA support for CPSW driver