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33 lines
1.2 KiB
Plaintext
33 lines
1.2 KiB
Plaintext
.. cfgcmd:: set interfaces {{ var0 }} <interface> xdp
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Enable support for Linux :abbr:`XDP (eXpress Data Path)` on recent 1.4 rolling
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releases. You must enable it for every interface which should participate in
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the XDP forwarding.
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XDP is an eBPF based high performance data path merged in the Linux kernel
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since version 4.8. The idea behind XDP is to add an early hook in the RX path
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of the kernel, and let a user supplied eBPF program decide the fate of the
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packet. The hook is placed in the NIC driver just after the interrupt
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processing, and before any memory allocation needed by the network stack
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itself, because memory allocation can be an expensive operation.
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.. warning:: This is highly experimental!
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.. note:: Enabling this feature will break any form of NAT or Firewalling on
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this interface, as XDP is handled way earlier in the driver then iptables/
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nftables.
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Enabling this feature will only load the XDP router code as described here:
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.. stop_vyoslinter
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https://blog.apnic.net/2020/04/30/how-to-build-an-xdp-based-bgp-peering-router/
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.. start_vyoslinter
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Example:
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.. code-block:: none
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set interfaces {{ var0 }} {{ var1 }} xdp
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