netdev - Re: [PATCH v5 net-next 5/5] net: dsa: microchip: Enable HSR offloading for KSZ9477

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Message-ID: <c0103cd4-7779-1f7c-2d90-d1d0512aa1ba@gmail.com>
Date: Thu, 21 Sep 2023 10:52:58 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Lukasz Majewski <lukma@...x.de>, Tristram.Ha@...rochip.com,
 Eric Dumazet <edumazet@...gle.com>, Andrew Lunn <andrew@...n.ch>,
 davem@...emloft.net, Woojung Huh <woojung.huh@...rochip.com>,
 Vladimir Oltean <olteanv@...il.com>, Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH v5 net-next 5/5] net: dsa: microchip: Enable HSR
 offloading for KSZ9477

On 9/20/23 04:43, Lukasz Majewski wrote:
> This patch adds functions for providing in KSZ9477 switch HSR
> (High-availability Seamless Redundancy) hardware offloading.
> 
> According to AN3474 application note following features are provided:
> - TX packet duplication from host to switch (NETIF_F_HW_HSR_DUP)
> - RX packet duplication discarding
> - Prevention of packet loop
> 
> For last two ones - there is a probability that some packets will not
> be filtered in HW (in some special cases - described in AN3474).
> Hence, the HSR core code shall be used to discard those not caught frames.
> 
> Moreover, some switch registers adjustments are required - like setting
> MAC address of HSR network interface.
> 
> Additionally, the KSZ9477 switch has been configured to forward frames
> between HSR ports (e.g. 1,2) members to provide support for
> NETIF_F_HW_HSR_FWD flag.
> 
> Join and leave functions are written in a way, that are executed with
> single port - i.e. configuration is NOT done only when second HSR port
> is configured.
> 
> Co-developed-by: Vladimir Oltean <vladimir.oltean@....com>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> Signed-off-by: Lukasz Majewski <lukma@...x.de>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
-- 
Florian