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Alexander Duyck e962f30297 fib_trie: Fix trie balancing issue if new node pushes down existing node 
This patch addresses an issue with the level compression of the fib_trie.
Specifically in the case of adding a new leaf that triggers a new node to
be added that takes the place of the old node.  The result is a trie where
the 1 child tnode is on one side and one leaf is on the other which gives
you a very deep trie.  Below is the script I used to generate a trie on
dummy0 with a 10.X.X.X family of addresses.

  ip link add type dummy
  ipval=184549374
  bit=2
  for i in `seq 1 23`
  do
    ifconfig dummy0:$bit $ipval/8
    ipval=`expr $ipval - $bit`
    bit=`expr $bit \* 2`
  done
  cat /proc/net/fib_triestat

Running the script before the patch:

	Local:
		Aver depth:     10.82
		Max depth:      23
		Leaves:         29
		Prefixes:       30
		Internal nodes: 27
		  1: 26  2: 1
		Pointers: 56
	Null ptrs: 1
	Total size: 5  kB

After applying the patch and repeating:

	Local:
		Aver depth:     4.72
		Max depth:      9
		Leaves:         29
		Prefixes:       30
		Internal nodes: 12
		  1: 3  2: 2  3: 7
		Pointers: 70
	Null ptrs: 30
	Total size: 4  kB

What this fix does is start the rebalance at the newly created tnode
instead of at the parent tnode.  This way if there is a gap between the
parent and the new node it doesn't prevent the new tnode from being
coalesced with any pre-existing nodes that may have been pushed into one
of the new nodes child branches.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2014-12-12 10:58:53 -05:00
..
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-12-11 14:27:06 -08:00
Kconfig net: Move fou_build_header into fou.c and refactor 2014-11-05 16:30:02 -05:00
Makefile net: Add Geneve tunneling protocol driver 2014-10-06 00:32:20 -04:00
af_inet.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-29 20:47:48 -08:00
ah4.c ipsec: Remove obsolete MAX_AH_AUTH_LEN 2014-09-18 10:54:36 +02:00
arp.c neigh: remove dynamic neigh table registration support 2014-11-11 15:23:54 -05:00
cipso_ipv4.c cipso: remove NULL assignment on static 2014-11-04 15:09:52 -05:00
datagram.c net: Save TX flow hash in sock and set in skbuf on xmit 2014-07-07 21:14:21 -07:00
devinet.c ipv4: fail early when creating netdev named all or default 2014-07-29 11:43:50 -07:00
esp4.c net: esp: Convert NETDEBUG to pr_info 2014-11-06 15:11:10 -05:00
fib_frontend.c ipv4: Restore accept_local behaviour in fib_validate_source() 2014-08-22 12:23:10 -07:00
fib_lookup.h ipv4: make fib_detect_death static 2013-12-28 17:01:46 -05:00
fib_rules.c ipv4: Fix incorrect error code when adding an unreachable route 2014-11-16 14:11:45 -05:00
fib_semantics.c ipv4: fix nexthop attlen check in fib_nh_match 2014-10-14 15:59:37 -04:00
fib_trie.c fib_trie: Fix trie balancing issue if new node pushes down existing node 2014-12-12 10:58:53 -05:00
fou.c gue: Call remcsum_adjust 2014-11-26 12:25:44 -05:00
geneve.c vlan: introduce *vlan_hwaccel_push_inside helpers 2014-11-21 14:20:17 -05:00
gre_demux.c net: Fix GRE RX to use skb_transport_header for GRE header offset 2014-09-08 15:23:05 -07:00
gre_offload.c gre: Set inner mac header in gro complete 2014-12-05 21:18:34 -08:00
icmp.c icmp: Remove some spurious dropped packet profile hits from the ICMP path 2014-11-18 15:28:28 -05:00
igmp.c ipv6: mld: fix add_grhead skb_over_panic for devs with large MTUs 2014-11-16 16:55:06 -05:00
inet_connection_sock.c ipv4: make ip_local_reserved_ports per netns 2014-05-14 15:31:45 -04:00
inet_diag.c inet_diag: fix inet_diag_dump_icsk() to use correct state for timewait sockets 2014-01-13 22:35:46 -08:00
inet_fragment.c net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
inet_hashtables.c net: use reciprocal_scale() helper 2014-08-23 12:21:21 -07:00
inet_lro.c lro: remove dead code 2013-12-29 16:34:25 -05:00
inet_timewait_sock.c tcp/dccp: remove twchain 2013-10-08 23:19:24 -04:00
inetpeer.c inet: remove dead inetpeer sequence code 2014-09-08 16:42:42 -07:00
ip_forward.c net: rename local_df to ignore_df 2014-05-12 14:03:41 -04:00
ip_fragment.c net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
ip_gre.c fou: Fix typo in returning flags in netlink 2014-11-05 22:18:20 -05:00
ip_input.c net: Fix memory leak if TPROXY used with TCP early demux 2014-01-27 16:22:11 -08:00
ip_options.c ipv4: rename ip_options_echo to __ip_options_echo() 2014-09-28 16:35:42 -04:00
ip_output.c put iov_iter into msghdr 2014-12-09 16:29:03 -05:00
ip_sockglue.c net: introduce helper macro for_each_cmsghdr 2014-12-10 22:41:55 -05:00
ip_tunnel.c ip_tunnel: Ops registration for secondary encap (fou, gue) 2014-11-12 15:01:35 -05:00
ip_tunnel_core.c ipv4: fix a potential use after free in ip_tunnel_core.c 2014-10-17 23:45:26 -04:00
ip_vti.c ip_tunnel: the lack of vti_link_ops' dellink() cause kernel panic 2014-11-23 21:11:17 -05:00
ipcomp.c ipcomp4: Use the IPsec protocol multiplexer API 2014-02-25 07:04:17 +01:00
ipconfig.c ipv4: remove 0/NULL assignment on static 2014-11-04 15:09:52 -05:00
ipip.c fou: Fix typo in returning flags in netlink 2014-11-05 22:18:20 -05:00
ipmr.c net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
netfilter.c netfilter: remove double colon 2014-02-19 11:41:25 +01:00
ping.c put iov_iter into msghdr 2014-12-09 16:29:03 -05:00
proc.c tcp_cubic: add SNMP counters to track how effective is Hystart 2014-12-09 14:58:23 -05:00
protocol.c net: Export inet_offloads and inet6_offloads 2014-09-19 17:15:31 -04:00
raw.c put iov_iter into msghdr 2014-12-09 16:29:03 -05:00
route.c ipv4: Do not cache routing failures due to disabled forwarding. 2014-10-30 19:20:40 -04:00
syncookies.c net: allow setting ecn via routing table 2014-11-04 16:06:09 -05:00
sysctl_net_ipv4.c tcp: allow for bigger reordering level 2014-10-29 15:05:15 -04:00
tcp.c Merge branch 'for-davem-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-12-10 13:17:23 -05:00
tcp_bic.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_cong.c tcp: spelling s/plugable/pluggable 2014-11-04 15:09:52 -05:00
tcp_cubic.c tcp_cubic: refine Hystart delay threshold 2014-12-09 14:58:23 -05:00
tcp_dctcp.c net: tcp: add DCTCP congestion control algorithm 2014-09-29 00:13:10 -04:00
tcp_diag.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_fastopen.c tcp: remove unnecessary assignment. 2014-09-29 12:31:12 -04:00
tcp_highspeed.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_htcp.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_hybla.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_illinois.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_input.c switch tcp_sock->ucopy from iovec (ucopy.iov) to msghdr (ucopy.msg) 2014-12-09 16:28:22 -05:00
tcp_ipv4.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-12-10 15:48:20 -05:00
tcp_lp.c tcp: remove in_flight parameter from cong_avoid() methods 2014-05-03 19:23:07 -04:00
tcp_memcontrol.c mm: memcontrol: lockless page counters 2014-12-10 17:41:04 -08:00
tcp_metrics.c tcp: don't allow syn packets without timestamps to pass tcp_tw_recycle logic 2014-08-14 14:38:54 -07:00
tcp_minisocks.c tcp: change TCP_ECN prefixes to lower case 2014-09-29 14:41:22 -04:00
tcp_offload.c net: Remove MPLS GSO feature. 2014-11-05 23:52:33 -08:00
tcp_output.c Merge branch 'for-davem-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-12-10 13:17:23 -05:00
tcp_probe.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_scalable.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_timer.c net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
tcp_vegas.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_vegas.h net: ipv4/ipv6: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
tcp_veno.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_westwood.c net: tcp: split ack slow/fast events from cwnd_event 2014-09-29 00:13:10 -04:00
tcp_yeah.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tunnel4.c
…
udp.c ip_generic_getfrag, udplite_getfrag: switch to passing msghdr 2014-12-09 16:28:22 -05:00
udp_diag.c netlink: rename ssk to sk in struct netlink_skb_params 2013-04-19 14:57:56 -04:00
udp_impl.h net: ipv4/ipv6: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
udp_offload.c net: Remove MPLS GSO feature. 2014-11-05 23:52:33 -08:00
udp_tunnel.c udp-tunnel: Add a few more UDP tunnel APIs 2014-09-19 15:57:15 -04:00
udplite.c net: Eliminate no_check from protosw 2014-05-23 16:28:53 -04:00
xfrm4_input.c xfrm4: Add IPsec protocol multiplexer 2014-02-25 07:04:16 +01:00
xfrm4_mode_beet.c ipv4: ERROR: code indent should use tabs where possible 2013-12-26 13:43:21 -05:00
xfrm4_mode_transport.c
…
xfrm4_mode_tunnel.c inetpeer: get rid of ip_id_count 2014-06-02 11:00:41 -07:00
xfrm4_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-05-24 00:32:30 -04:00
xfrm4_policy.c xfrm: Introduce xfrm_input_afinfo to access the the callbacks properly 2014-03-14 07:28:07 +01:00
xfrm4_protocol.c xfrm4: Remove duplicate semicolon 2014-06-30 07:49:47 +02:00
xfrm4_state.c inet: make no_pmtu_disc per namespace and kill ipv4_config 2013-12-18 16:58:20 -05:00
xfrm4_tunnel.c sit: add IPv4 over IPv4 support 2013-05-31 17:19:05 -07:00