[IPV4]: Move FIB lookup algorithm choice under IP_ADVANCED_ROUTING
Most users need not be concerned with a complex choice of what
FIB lookup algorithm to use. So give them the safe default of
IP_FIB_HASH if IP_ADVANCED_ROUTING is disabled.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 690e88b..7bcfb84 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -1,32 +1,6 @@
#
# IP configuration
#
-choice
- prompt "Choose IP: FIB lookup"
- depends on INET
- default IP_FIB_HASH
-
-config IP_FIB_HASH
- bool "FIB_HASH"
- ---help---
- Current FIB is very proven and good enough for most users.
-
-config IP_FIB_TRIE
- bool "FIB_TRIE"
- ---help---
- Use new experimental LC-trie as FIB lookup algoritm.
- This improves lookup performance
-
- LC-trie is described in:
-
- IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson
- IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999
- An experimental study of compression methods for dynamic tries
- Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002.
- http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/
-
-endchoice
-
config IP_MULTICAST
bool "IP: multicasting"
depends on INET
@@ -79,6 +53,44 @@
If unsure, say N here.
+choice
+ prompt "Choose IP: FIB lookup algorithm (choose FIB_HASH if unsure)"
+ depends on IP_ADVANCED_ROUTER
+ default IP_FIB_HASH
+
+config IP_FIB_HASH
+ bool "FIB_HASH"
+ ---help---
+ Current FIB is very proven and good enough for most users.
+
+config IP_FIB_TRIE
+ bool "FIB_TRIE"
+ ---help---
+ Use new experimental LC-trie as FIB lookup algoritm.
+ This improves lookup performance if you have a large
+ number of routes.
+
+ LC-trie is a longest matching prefix lookup algorithm which
+ performs better than FIB_HASH for large routing tables.
+ But, it consumes more memory and is more complex.
+
+ LC-trie is described in:
+
+ IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson
+ IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999
+ An experimental study of compression methods for dynamic tries
+ Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002.
+ http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/
+
+endchoice
+
+# If the user does not enable advanced routing, he gets the safe
+# default of the fib-hash algorithm.
+config IP_FIB_HASH
+ bool
+ depends on !IP_ADVANCED_ROUTER
+ default y
+
config IP_MULTIPLE_TABLES
bool "IP: policy routing"
depends on IP_ADVANCED_ROUTER