ipv4: update ARPD help text

Removed the statements about ARP cache size as this config option does
not affect it. The cache size is controlled by neigh_table gc thresholds.

Remove also expiremental and obsolete markings as the API originally
intended for arp caching is useful for implementing ARP-like protocols
(e.g. NHRP) in user space and has been there for a long enough time.

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 22 deletions

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 5b919f7b45db..70491d9035eb 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -273,29 +273,20 @@ config IP_PIMSM_V2
           you want to play with it.
 
 config ARPD
-        bool "IP: ARP daemon support (EXPERIMENTAL)"
-        depends on EXPERIMENTAL
+        bool "IP: ARP daemon support"
         ---help---
-          Normally, the kernel maintains an internal cache which maps IP
-          addresses to hardware addresses on the local network, so that
-          Ethernet/Token Ring/ etc. frames are sent to the proper address on
-          the physical networking layer. For small networks having a few
-          hundred directly connected hosts or less, keeping this address
-          resolution (ARP) cache inside the kernel works well. However,
-          maintaining an internal ARP cache does not work well for very large
-          switched networks, and will use a lot of kernel memory if TCP/IP
-          connections are made to many machines on the network.
-
-          If you say Y here, the kernel's internal ARP cache will never grow
-          to more than 256 entries (the oldest entries are expired in a LIFO
-          manner) and communication will be attempted with the user space ARP
-          daemon arpd. Arpd then answers the address resolution request either
-          from its own cache or by asking the net.
-
-          This code is experimental and also obsolete. If you want to use it,
-          you need to find a version of the daemon arpd on the net somewhere,
-          and you should also say Y to "Kernel/User network link driver",
-          below. If unsure, say N.
+          The kernel maintains an internal cache which maps IP addresses to
+          hardware addresses on the local network, so that Ethernet/Token Ring/
+          etc. frames are sent to the proper address on the physical networking
+          layer. Normally, kernel uses the ARP protocol to resolve these
+          mappings.
+
+          Saying Y here adds support to have an user space daemon to do this
+          resolution instead. This is useful for implementing an alternate
+          address resolution protocol (e.g. NHRP on mGRE tunnels) and also for
+          testing purposes.
+
+          If unsure, say N.
 
 config SYN_COOKIES
         bool "IP: TCP syncookie support (disabled per default)"