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Diffstat (limited to 'docs/configuration/interfaces/ethernet.rst')
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diff --git a/docs/configuration/interfaces/ethernet.rst b/docs/configuration/interfaces/ethernet.rst index b4151dd2..2debed16 100644 --- a/docs/configuration/interfaces/ethernet.rst +++ b/docs/configuration/interfaces/ethernet.rst @@ -66,6 +66,40 @@ Ethernet options set interfaces ethernet eth0 mirror eth1 +Offloading +---------- + +.. cfgcmd:: set interfaces ethernet <interface> offload <gro | gso | sg | + tso | ufo> + + Enable different types of hardware offloading on the given NIC. + + Generic segmentation offload is a pure software offload that is meant to deal + with cases where device drivers cannot perform the offloads described above. + What occurs in GSO is that a given skbuff will have its data broken out over + multiple skbuffs that have been resized to match the MSS provided via + skb_shinfo()->gso_size. + + Before enabling any hardware segmentation offload a corresponding software + offload is required in GSO. Otherwise it becomes possible for a frame to be + re-routed between devices and end up being unable to be transmitted. + + Generic receive offload is the complement to GSO. Ideally any frame assembled + by GRO should be segmented to create an identical sequence of frames using + GSO, and any sequence of frames segmented by GSO should be able to be + reassembled back to the original by GRO. The only exception to this is IPv4 + ID in the case that the DF bit is set for a given IP header. If the value of + 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. + + 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. + + VLAN ==== |