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| -rw-r--r-- | docs/configuration/interfaces/ethernet.rst | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/docs/configuration/interfaces/ethernet.rst b/docs/configuration/interfaces/ethernet.rst index 25eebf25..8c6bcc07 100644 --- a/docs/configuration/interfaces/ethernet.rst +++ b/docs/configuration/interfaces/ethernet.rst @@ -92,13 +92,24 @@ Offloading the IPv4 ID is not sequentially incrementing it will be altered so that it is when a frame assembled via GRO is segmented via GSO. - .. warning:: Recent 1.3 rolling images also support XDP offloading which - stands for eXpress Data Path in the Linux Kernel. You must enable it for - every interface which should participate in the XDP forwarding. +.. cfgcmd:: set interfaces ethernet <interface> xdp - Enabling this feature will break any form of NAT or Firewalling on this - interface, as XDP is handled way earlier in the driver then NfTables. + Enable support for Linux :abbr:`XDP (eXpress Data Path)` on recent 1.3 rolling + releases. You must enable it for every interface which should participate in + the XDP forwarding. + XDP is an eBPF based high performance data path merged in the Linux kernel + since version 4.8. The idea behind XDP is to add an early hook in the RX path + of the kernel, and let a user supplied eBPF program decide the fate of the + packet. The hook is placed in the NIC driver just after the interrupt + processing, and before any memory allocation needed by the network stack + itself, because memory allocation can be an expensive operation. + + .. warning:: This is highly experimental! + + .. note:: Enabling this feature will break any form of NAT or Firewalling on + this interface, as XDP is handled way earlier in the driver then iptables/ + nftables. VLAN ==== |