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From: David Miller <davem@davemloft.net>
To: olteanv@gmail.com
Cc: kuba@kernel.org, kurt@linutronix.de, andrew@lunn.ch,
	vivien.didelot@gmail.com, f.fainelli@gmail.com,
	netdev@vger.kernel.org, robh+dt@kernel.org,
	devicetree@vger.kernel.org, bigeasy@linutronix.de,
	richardcochran@gmail.com, kamil.alkhouri@hs-offenburg.de,
	ilias.apalodimas@linaro.org, ivan.khoronzhuk@linaro.org,
	vinicius.gomes@intel.com, xiaoliang.yang_1@nxp.com,
	Po.Liu@nxp.com
Subject: Re: [PATCH v3 0/8] Hirschmann Hellcreek DSA driver
Date: Mon, 24 Aug 2020 15:35:18 -0700 (PDT)	[thread overview]
Message-ID: <20200824.153518.700546598086140133.davem@davemloft.net> (raw)
In-Reply-To: <20200824220203.atjmjrydq4qyt33x@skbuf>

From: Vladimir Oltean <olteanv@gmail.com>
Date: Tue, 25 Aug 2020 01:02:03 +0300

> Just my comment on patch 5/8 about netdev->tc_to_txq. There are 2
> distinct things about that:
> - accessing struct net_device directly hurts the DSA model a little bit.
> - I think there's some confusion regarding the use of netdev->tc_to_txq
>   itself. I don't think that's the right place to setup a VLAN PCP to
>   traffic class mapping. That's simply "what traffic class does each
>   netdev queue have". I would even go as far as say that Linux doesn't
>   support a VLAN PCP to TC mapping (similar to the DSCP to TC mapping
>   from the DCB ops) at all, except for the ingress-qos-map and
>   egress-qos-map of the 8021q driver, which can't be offloaded and don't
>   map nicely over existing hardware anyway (what hardware has an
>   ingress-qos-map and an egress-qos-map per individual VLAN?!).
>   Although I do really see the need for having a mapping between VLAN
>   PCP and traffic class, I would suggest Kurt to not expose this through
>   taprio/mqprio (hardcode the PCP mapping as 1-to-1 with TC, as other
>   drivers do), and let's try to come up separately with an abstraction
>   for that.

Agreed, Kurt can you repost this series without the TAPRIO support for
now since it's controversial and needs more discussion and changes?

Thank you.

  reply	other threads:[~2020-08-24 22:35 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-20  8:11 Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 1/8] net: dsa: Add tag handling for Hirschmann Hellcreek switches Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 2/8] net: dsa: Add DSA driver " Kurt Kanzenbach
2020-08-24 22:44   ` Andrew Lunn
2020-08-25  9:07     ` Kurt Kanzenbach
2020-08-25 13:56       ` Andrew Lunn
2020-08-25 14:48         ` Kurt Kanzenbach
2020-08-27 10:29           ` Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 3/8] net: dsa: hellcreek: Add PTP clock support Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 4/8] net: dsa: hellcreek: Add support for hardware timestamping Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 5/8] net: dsa: hellcreek: Add TAPRIO offloading support Kurt Kanzenbach
2020-08-22 14:39   ` Vladimir Oltean
2020-08-24  6:10     ` Kurt Kanzenbach
2020-08-24 23:45       ` Vinicius Costa Gomes
2020-08-25  9:42         ` Kurt Kanzenbach
2020-08-25 17:58           ` Vinicius Costa Gomes
2020-08-27 10:12             ` Kurt Kanzenbach
2020-08-25  9:46         ` Vladimir Oltean
2020-08-25 10:09           ` Kurt Kanzenbach
2020-08-25 17:33           ` Vinicius Costa Gomes
2020-08-24 22:56   ` Vladimir Oltean
2020-08-25  9:33     ` Kurt Kanzenbach
2020-08-25  9:38       ` Vladimir Oltean
2020-08-25  9:55         ` Kurt Kanzenbach
2020-08-27 16:25           ` Richard Cochran
2020-08-28 12:31             ` Kurt Kanzenbach
2020-08-24 23:57   ` Vinicius Costa Gomes
2020-08-25  9:23     ` Kurt Kanzenbach
2020-08-25  9:32       ` Vladimir Oltean
2020-09-01 14:20         ` Kurt Kanzenbach
2020-09-01 14:47           ` Vladimir Oltean
2020-08-25 17:50       ` Vinicius Costa Gomes
2020-08-20  8:11 ` [PATCH v3 6/8] net: dsa: hellcreek: Add PTP status LEDs Kurt Kanzenbach
2020-08-24 22:50   ` Andrew Lunn
2020-08-20  8:11 ` [PATCH v3 7/8] dt-bindings: Add vendor prefix for Hirschmann Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 8/8] dt-bindings: net: dsa: Add documentation for Hellcreek switches Kurt Kanzenbach
2020-08-24 22:52   ` Andrew Lunn
2020-08-25 22:28   ` Rob Herring
2020-08-24 21:31 ` [PATCH v3 0/8] Hirschmann Hellcreek DSA driver Jakub Kicinski
2020-08-24 22:02   ` Vladimir Oltean
2020-08-24 22:35     ` David Miller [this message]
2020-08-24 22:57       ` Vladimir Oltean
2020-08-25 11:21       ` Kurt Kanzenbach
2020-08-25 17:14         ` Florian Fainelli

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