Commit 12fa7438 authored by Haiyang Zhang's avatar Haiyang Zhang Committed by David S. Miller
Browse files

hv_netvsc: Update document for XDP support 



Added the new section in the document regarding XDP support
by hv_netvsc driver.

Signed-off-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 351e1581

Documentation/networking/device_drivers/microsoft/netvsc.txt

+21 −0
Original line number Diff line number Diff line
@@ -82,3 +82,24 @@ Features 
  contain one or more packets. The send buffer is an optimization, the driver

  will use slower method to handle very large packets or if the send buffer

  area is exhausted.



  XDP support

  -----------

  XDP (eXpress Data Path) is a feature that runs eBPF bytecode at the early

  stage when packets arrive at a NIC card. The goal is to increase performance

  for packet processing, reducing the overhead of SKB allocation and other

  upper network layers.



  hv_netvsc supports XDP in native mode, and transparently sets the XDP

  program on the associated VF NIC as well.



  Setting / unsetting XDP program on synthetic NIC (netvsc) propagates to

  VF NIC automatically. Setting / unsetting XDP program on VF NIC directly

  is not recommended, also not propagated to synthetic NIC, and may be

  overwritten by setting of synthetic NIC.



  XDP program cannot run with LRO (RSC) enabled, so you need to disable LRO

  before running XDP:

	ethtool -K eth0 lro off



  XDP_REDIRECT action is not yet supported.

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