linux-kernel - [PATCH v2 2/2] net: Change default delay on IP autoconfig to 0ms

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Message-Id: <20240208100304.253337-1-david@davidv.dev>
Date: Thu,  8 Feb 2024 11:03:04 +0100
From: David Ventura <david@...idv.dev>
To: david@...idv.dev
Cc: Jonathan Corbet <corbet@....net>,
	"David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH v2 2/2] net: Change default delay on IP autoconfig to 0ms

Reduce the default settle time from 10ms to 0ms, based on previous discussions (
https://lore.kernel.org/netdev/1305696161-18277-1-git-send-email-micha@neli.hopto.org/t/
https://lore.kernel.org/netdev/580001e3-17ef-4f24-8fd8-bc14110e874e@lunn.ch/
) ARP and DHCP retries are expected to handle any lost transmissions.

This patch depends on 1f0aa0c947eeb4edb60add141a5bc2309f2dc8dd ("
net: make driver settling time configurable").

Signed-off-by: David Ventura <david@...idv.dev>
---
 Documentation/admin-guide/nfs/nfsroot.rst | 2 +-
 net/ipv4/ipconfig.c                       | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/nfs/nfsroot.rst b/Documentation/admin-guide/nfs/nfsroot.rst
index f26f7a342af6..fce610a4ec54 100644
--- a/Documentation/admin-guide/nfs/nfsroot.rst
+++ b/Documentation/admin-guide/nfs/nfsroot.rst
@@ -225,7 +225,7 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:<dns
 
 ip.dev_wait_ms=<value>
   Set the number of milliseconds to delay after opening the network device
-  which will be autoconfigured. Defaults to 10 milliseconds.
+  which will be autoconfigured. Defaults to 0 milliseconds.
 
 nfsrootdebug
   This parameter enables debugging messages to appear in the kernel
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index cbf35163b973..8b7d08649b09 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -99,7 +99,7 @@
 
 /* Wait for carrier timeout default in seconds */
 static unsigned int carrier_timeout = 120;
-static unsigned int dev_wait_ms = 10;
+static unsigned int dev_wait_ms = 0;
 
 /*
  * Public IP configuration
-- 
2.39.2