hv_netvsc: Update document for XDP support

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

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Haiyang Zhang 2020-01-23 13:52:35 -08:00 committed by David S. Miller
parent 351e158139
commit 12fa74383e
1 changed files with 21 additions and 0 deletions

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@ -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.