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

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Date:   Wed, 14 Aug 2019 08:45:07 +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

> > -----Original Message-----
> > From: Allan W. Nielsen <allan.nielsen@...rochip.com>
> > Sent: Tuesday, August 13, 2019 2:16 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 08/13/2019 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://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatc
> > >
> > hwork.ozlabs.org%2Fproject%2Fnetdev%2Flist%2F%3Fseries%3D115399%26s
> > tat
> > >
> > e%3D*&amp;data=02%7C01%7Cyangbo.lu%40nxp.com%7C42cd202cb17b45
> > 69821708d
> > >
> > 71fb5c5de%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C6370127
> > 37899910
> > >
> > 736&amp;sdata=QnsDaWPHK9rb0XWg%2BduYEha6fuYSlv4YZdsu5f4kbfc%3D
> > &amp;res
> > > erved=0
> > >
> > > 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.
> 
> [Y.b. Lu] Sorry. I missed your previous comments on the TRAP action.
> With my configuration in the patch, it indeed worked. Maybe it was because "the CPU port is not touched by MASK_MODE" which I saw in RM.
Okay. If this is working, then you should properly test and see if the DROP
action is working on your target. I do not have access to the SoC which incldues
Felix, so I cannot check.

> I will try your suggestion too. It sound more proper.
Sounds good - thanks

/Allan