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From: Xiaoliang Yang <xiaoliang.yang_1@nxp.com>
To: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: "davem@davemloft.net" <davem@davemloft.net>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"allan.nielsen@microchip.com" <allan.nielsen@microchip.com>,
	"joergen.andreasen@microchip.com"
	<joergen.andreasen@microchip.com>,
	"UNGLinuxDriver@microchip.com" <UNGLinuxDriver@microchip.com>,
	"vinicius.gomes@intel.com" <vinicius.gomes@intel.com>,
	"michael.chan@broadcom.com" <michael.chan@broadcom.com>,
	"saeedm@mellanox.com" <saeedm@mellanox.com>,
	"jiri@mellanox.com" <jiri@mellanox.com>,
	"idosch@mellanox.com" <idosch@mellanox.com>,
	"alexandre.belloni@bootlin.com" <alexandre.belloni@bootlin.com>,
	"kuba@kernel.org" <kuba@kernel.org>, Po Liu <po.liu@nxp.com>,
	Leo Li <leoyang.li@nxp.com>
Subject: RE: [PATCH v3 net-next 5/8] net: dsa: felix: support psfp filter on vsc9959
Date: Tue, 31 Aug 2021 09:59:11 +0000	[thread overview]
Message-ID: <DB8PR04MB57855C49E4564A8B79C991C3F0CC9@DB8PR04MB5785.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20210831091759.dacg377d7jsiuylp@skbuf>



On Tue, Aug 31, 2021 at 17:18:00PM +0300, Vladimir Oltean wrote:
> > > > I think in previous versions you were automatically installing a
> > > > static MAC table entry when one was not present (either it was
> > > > absent, or the entry was dynamically learned). Why did that change?
> > >
> > > The PSFP gate and police action are set on ingress port, and "
> > > tc-filter" has no parameter to set the forward port for the filtered
> > > stream. And I also think that adding a FDB mac entry in tc-filter
> > > command is not good.
> >
> > Fair enough, but if that's what you want, we'll need to think a lot
> > harder about how this needs to be modeled.
> >
> > Would you not have to protect against a 'bridge fdb del' erasing your
> > MAC table entry after you've set up the TSN stream on it?
> >
> > Right now, DSA does not even call the driver's .port_fdb_del method
> > from atomic context, just from deferred work context. So even if you
> > wanted to complain and say "cannot remove FDB entry until SFID stops
> > pointing at it", that would not be possible with today's code structure.
> >
> > And what would you do if the bridge wants to delete the FDB entry
> > irrevocably, like when the user wants to delete the bridge in its
> > entirety? You would still remain with filters in tc which are not
> > backed by any MAC table entry.
> >
> > Hmm..
> > Either the TSN standards for PSFP and FRER are meant to be implemented
> > within the bridge driver itself, and not as part of tc, or the
> > Microchip implementation is very weird for wiring them into the bridge MAC
> table.
> >
> > Microchip people, any comments?
> 
> In sja1105's implementation of PSFP (which is not standard-compliant as it is
> based on TTEthernet, but makes more sense anyway), the Virtual Links (SFIDs
> here) are not based on the FDB table, but match only on the given source port.
> They behave much more like ACL entries.
> The way I've modeled them in Linux was to force the user to offload multiple
> actions for the same tc-filter, both a redirect action and a police/gate action.
> https://www.kernel.org/doc/html/latest/networking/dsa/sja1105.html#time-b
> ased-ingress-policing
> 
> I'm not saying this helps you, I'm just saying maybe the Microchip
> implementation is strange, but then again, I might be looking the wrong way
> at it.

Yes, Using redirect action can give PSFP filter a forward port to add MAC table entry. But it also has the issue that when using "bridge fdb del" to delete the MAC entry will cause the tc-filter rule not working.

  reply	other threads:[~2021-08-31  9:59 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-31  3:45 [PATCH v3 net-next 0/8] net: dsa: felix: psfp support " Xiaoliang Yang
2021-08-31  3:45 ` [PATCH v3 net-next 1/8] net: mscc: ocelot: export struct ocelot_mact_entry Xiaoliang Yang
2021-08-31  3:45 ` [PATCH v3 net-next 2/8] net: mscc: ocelot: add MAC table write and lookup operations Xiaoliang Yang
2021-08-31  3:45 ` [PATCH v3 net-next 3/8] net: mscc: ocelot: set vcap IS2 chain to goto PSFP chain Xiaoliang Yang
2021-08-31  3:45 ` [PATCH v3 net-next 4/8] net: mscc: ocelot: add gate and police action offload to PSFP Xiaoliang Yang
2021-08-31  3:45 ` [PATCH v3 net-next 5/8] net: dsa: felix: support psfp filter on vsc9959 Xiaoliang Yang
2021-08-31  7:54   ` Vladimir Oltean
2021-08-31  8:41     ` Xiaoliang Yang
2021-08-31  8:46       ` Vladimir Oltean
2021-08-31  8:55         ` Vladimir Oltean
2021-08-31  8:59         ` Xiaoliang Yang
2021-08-31  9:07           ` Vladimir Oltean
2021-08-31  9:18             ` Vladimir Oltean
2021-08-31  9:59               ` Xiaoliang Yang [this message]
2021-08-31 10:49                 ` Vladimir Oltean
2021-09-02  3:14                   ` Xiaoliang Yang
2021-09-09 11:33                   ` Joergen Andreasen
2021-09-09 12:01                     ` Vladimir Oltean
2021-08-31  3:45 ` [PATCH v3 net-next 6/8] net: dsa: felix: add stream gate settings for psfp Xiaoliang Yang
2021-08-31  3:45 ` [PATCH v3 net-next 7/8] net: mscc: ocelot: use index to set vcap policer Xiaoliang Yang
2021-08-31  3:45 ` [PATCH v3 net-next 8/8] net: dsa: felix: use vcap policer to set flow meter for psfp Xiaoliang Yang

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