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kernel: add a fast path for the bridge code
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This caches flows between MAC addresses on separate ports, including their VLAN
in order to bypass the normal bridge forwarding code.
In my test on MT7622, this reduces LAN->WLAN bridging CPU usage by 6-10%,
potentially even more on weaker platforms

Signed-off-by: Felix Fietkau <nbd@nbd.name>
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nbd168 committed Feb 12, 2022
1 parent 8f5875c commit 94b4da9
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