Commit bb298ca3 authored by David S. Miller's avatar David S. Miller
Browse files

[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: default avatarDavid S. Miller <davem@davemloft.net>
parent f7704347

net/ipv4/Kconfig

+38 −26
Original line number Diff line number Diff line 
#

# 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 @@ config IP_ADVANCED_ROUTER 


	  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

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