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.
