From 582a2dbc72ac5dd2b3ae4f75bccd4b4c73bb0e1f Mon Sep 17 00:00:00 2001
From: Xin Long <lucien.xin@gmail.com>
Date: Wed, 18 May 2022 12:09:15 -0400
Subject: [PATCH] Documentation: add description for net.core.gro_normal_batch
Git-commit: 582a2dbc72ac5dd2b3ae4f75bccd4b4c73bb0e1f
Patch-mainline: v5.19-rc1
References: git-fixes

Describe it in admin-guide/sysctl/net.rst like other Network core options.
Users need to know gro_normal_batch for performance tuning.

Fixes: 323ebb61e32b ("net: use listified RX for handling GRO_NORMAL skbs")
Reported-by: Prijesh Patel <prpatel@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Edward Cree <ecree.xilinx@gmail.com>
Link: https://lore.kernel.org/r/acf8a2c03b91bcde11f67ff89b6050089c0712a3.1652888963.git.lucien.xin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 Documentation/admin-guide/sysctl/net.rst |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/Documentation/admin-guide/sysctl/net.rst
+++ b/Documentation/admin-guide/sysctl/net.rst
@@ -365,6 +365,15 @@ new netns has been created.
 
 Default : 0  (for compatibility reasons)
 
+gro_normal_batch
+----------------
+
+Maximum number of the segments to batch up on output of GRO. When a packet
+exits GRO, either as a coalesced superframe or as an original packet which
+GRO has decided not to coalesce, it is placed on a per-NAPI list. This
+list is then passed to the stack when the number of segments reaches the
+gro_normal_batch limit.
+
 2. /proc/sys/net/unix - Parameters for Unix domain sockets
 ----------------------------------------------------------