netdev - Re: [PATCH 3/3] ocelot_ace: fix action of trap

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Date:   Tue, 13 Aug 2019 08:16:04 +0200
From:   "Allan W. Nielsen" <allan.nielsen@...rochip.com>
To:     "Y.b. Lu" <yangbo.lu@....com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH 3/3] ocelot_ace: fix action of trap

The 08/13/2019 02:12, Y.b. Lu wrote:
> > -----Original Message-----
> > From: Allan W. Nielsen <allan.nielsen@...rochip.com>
> > Sent: Monday, August 12, 2019 8:32 PM
> > To: Y.b. Lu <yangbo.lu@....com>
> > Cc: netdev@...r.kernel.org; David S . Miller <davem@...emloft.net>;
> > Alexandre Belloni <alexandre.belloni@...tlin.com>; Microchip Linux Driver
> > Support <UNGLinuxDriver@...rochip.com>
> > Subject: Re: [PATCH 3/3] ocelot_ace: fix action of trap
> > 
> > The 08/12/2019 18:48, Yangbo Lu wrote:
> > > The trap action should be copying the frame to CPU and dropping it for
> > > forwarding, but current setting was just copying frame to CPU.
> > 
> > Are there any actions which do a "copy-to-cpu" and still forward the frame in
> > HW?
> 
> [Y.b. Lu] We're using Felix switch whose code hadn't been accepted by upstream.
> https://patchwork.ozlabs.org/project/netdev/list/?series=115399&state=*
> 
> I'd like to trap all IEEE 1588 PTP Ethernet frames to CPU through etype 0x88f7.
> When I used current TRAP option, I found the frames were not only copied to CPU, but also forwarded to other ports.
> So I just made the TRAP option same with DROP option except enabling CPU_COPY_ENA in the patch.
This is still wrong to do - and it will not work for Ocelot (and I doubt it will
work for your Felix target).

The policer setting in the drop action ensure that the frame is dropped even if
other pipe-line steps in the switch has set the copy-to-cpu flag.

I think you can fix this patch my just clearing the port mask, and not set the
policer.

/Allan