RE: [PATCH v4 net-next 5/8] net: dsa: felix: support psfp filter on vsc9959

[Xiaoliang Yang]

Hi Vladimir,

On Thu, Sep 23, 2021 at 15:45:16 +0000, Vladimir Oltean wrote:
> > Maybe we need to use ocelot_mact_learn() instead of
> > ocelot_mact_write() after setting SFID in StreamData. I think this can
> > avoid writing a wrong entry.
> 
> So you're thinking of introducing a new ocelot_mact_learn_with_streamdata(),
> that writes the SFID and SSID of the STREAMDATA too, instead of editing them
> in-place for an existing MAC table entry, and then issuing a LEARN MAC Table
> command which would hopefully transfer the entire data structure to the MAC
> table?
> 
> Have you tried that?

Yes, I have tried. I mean writes SFID of STREAMDATA in vsc9959_mact_stream_set() first, then calls ocelot_mact_learn() function to write VID, mac and STREAMDATA in MAC table. We don't need to introduce a new function. Once we call ocelot_mact_learn() function, STREAMDATA will be stored in the learned entry.

> 
> In the documentation for the LEARN MAC Table command, I see:
> 
> Purpose: Insert/learn new entry in MAC table.  Position given by (MAC, VID)
> 
> Use: Configure MAC and VID of the new entry in MACHDATA and MACLDATA.
> Configure remaining entry fields in MACACCESS.  The location in the MAC
> table is calculated based on (MAC, VID).
> 
> I just hope it will transfer the STREAMDATA too, it doesn't explicitly say that it
> will...
> 
> And assuming it does, will the LEARN command overwrite an existing static
> FDB entry which has the same MAC DA and VLAN ID, but not SFID?
> I haven't tried that either.

I tried the case that when MAC table index has changed, STREAMDATA will keep move with VID and MAC. The entry { STREAMDATA , VID, MAC} also can overwrite a static exist entry. I think we can do like this.