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Date: Fri, 4 Nov 2022 20:05:30 -0700 From: Jakub Kicinski <kuba@...nel.org> To: Maxime Chevallier <maxime.chevallier@...tlin.com> Cc: davem@...emloft.net, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>, Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, linux-arm-kernel@...ts.infradead.org, Vladimir Oltean <vladimir.oltean@....com>, Luka Perkov <luka.perkov@...tura.hr>, Robert Marko <robert.marko@...tura.hr>, Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...ainline.org> Subject: Re: [PATCH net-next v8 3/5] net: dsa: add out-of-band tagging protocol On Fri, 4 Nov 2022 18:41:49 +0100 Maxime Chevallier wrote: > This tagging protocol is designed for the situation where the link > between the MAC and the Switch is designed such that the Destination > Port, which is usually embedded in some part of the Ethernet Header, is > sent out-of-band, and isn't present at all in the Ethernet frame. > > This can happen when the MAC and Switch are tightly integrated on an > SoC, as is the case with the Qualcomm IPQ4019 for example, where the DSA > tag is inserted directly into the DMA descriptors. In that case, > the MAC driver is responsible for sending the tag to the switch using > the out-of-band medium. To do so, the MAC driver needs to have the > information of the destination port for that skb. > > Add a new tagging protocol based on SKB extensions to convey the > information about the destination port to the MAC driver This is what METADATA_HW_PORT_MUX is for, you shouldn't have to allocate a piece of memory for every single packet. Also the series doesn't build.
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