Re: [PATCH net-next v3 4/4] net: lan966x: Add ptp trap rules

[Michael Walle]

Am 2022-12-09 15:20, schrieb Horatiu Vultur:
> The 12/09/2022 15:05, Michael Walle wrote:
> > Am 2022-12-09 13:56, schrieb Vladimir Oltean:
> > > On Fri, Dec 09, 2022 at 01:58:57PM +0100, Horatiu Vultur wrote:
> > > > > Does it also work out of the box with the following patch if
> > > > > the interface is part of a bridge or do you still have to do
> > > > > the tc magic from above?
> > > >
> > > > You will still need to enable the TCAM using the tc command to have it
> > > > working when the interface is part of the bridge.
> > >
> > > FWIW, with ocelot (same VCAP mechanism), PTP traps work out of the box,
> > > no need to use tc. Same goes for ocelot-8021q, which also uses the
> > > VCAP.
> > > I wouldn't consider forcing the user to add any tc command in order for
> > > packet timestamping to work properly.
>
> On ocelot, the vcap is enabled at port initialization, while on other
> platforms(lan966x and sparx5) you have the option to enable or disable.
>
> > +1
> > Esp. because there is no warning. I.e. I tried this patch while
> > the interface was added on a bridge and there was no error
> > whatsoever.
>
> What error/warning were you expecting to see here?

Scrap that. ptp4l is reporting an error in case the device is part
of a bridge:
Jan  1 02:33:04 buildroot user.info syslog: [9184.261] driver rejected 
most general HWTSTAMP filter

Nevertheless, from a users POV I'd just expect it to work. How
would I know what I need to do here?

-michael