linux-kernel - [PATCH net-next, 4/4] hv_netvsc: Update document for XDP support

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Date:   Mon, 28 Oct 2019 21:07:11 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     "sashal@...nel.org" <sashal@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Haiyang Zhang <haiyangz@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>, vkuznets <vkuznets@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH net-next, 4/4] 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@...rosoft.com>
---
 .../networking/device_drivers/microsoft/netvsc.txt         | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/networking/device_drivers/microsoft/netvsc.txt b/Documentation/networking/device_drivers/microsoft/netvsc.txt
index 3bfa635..69ccfca 100644
--- a/Documentation/networking/device_drivers/microsoft/netvsc.txt
+++ b/Documentation/networking/device_drivers/microsoft/netvsc.txt
@@ -82,3 +82,17 @@ 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.
+
+  XDP program cannot run with LRO (RSC) enabled, so you need to disable LRO
+  before running XDP:
+	ethtool -K eth0 lro off
-- 
1.8.3.1