linux-kernel - Re: [PATCH v2 net-next] net: stmmac: Add support for DWMAC5 with TSN features

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Message-Id: <20171101.204858.1211893549464034006.davem@davemloft.net>
Date:   Wed, 01 Nov 2017 20:48:58 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     Jose.Abreu@...opsys.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Joao.Pinto@...opsys.com, peppe.cavallaro@...com,
        alexandre.torgue@...com
Subject: Re: [PATCH v2 net-next] net: stmmac: Add support for DWMAC5 with
 TSN features

From: Jose Abreu <Jose.Abreu@...opsys.com>
Date: Fri, 27 Oct 2017 14:55:44 +0100

> This adds support for IP version 5 of DWMAC. The new introduced
> features are the Enhancements to Scheduled Traffic (EST) as
> defined by IEEE802.1Qbv-2015 and Frame Preemption (FPE) as
> defined by IEEE802.1Qbu.
> 
> In order to not break previous setups all the necessary
> configuration is only performed when GMAC5 is detected and
> only when all the necessary parameters are available in the
> Device Tree.
> 
> EST:
> The IEEE802.1Qbv-2015 defines the schedule for each of the
> queues which makes the IP aware of traffic arrival time. This
> information can be used to block the lower priority traffic
> from transmission in this time window/slot.
> 
> FPE:
> The IEEE802.1Qbu defines a mechanism which breaks interfering
> frames into smaller fragments shuch that we have a more efficient
> use of network bandwidth. This needs EST enabled.
> 
> Signed-off-by: Jose Abreu <joabreu@...opsys.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Joao Pinto <jpinto@...opsys.com>
> Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
> Cc: Alexandre Torgue <alexandre.torgue@...com>
> ---
> Changes since v1:
> - Removed DT parsing

This patch is pointless until something is added which turns on the
boolean enable values.