- Import infrastructure for caching flows as a means of accelerating L3 and L2 lookups

  as well as providing stateful load balancing when used with RADIX_MPATH.
- Currently compiled in to i386 and amd64 but disabled by default, it can be enabled at
  runtime with 'sysctl net.inet.flowtable.enable=1'.

- Embedded users can remove it entirely from the kernel by adding 'nooption FLOWTABLE' to
  their kernel config files.

- A minimal hookup will be added to ip_output in a subsequent commit. I would like to see
  more review before bringing in changes that require more churn.

Supported by: Bitgravity Inc.

3 files changed, 5 insertions, 0 deletions

diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index b06d8d2..fe3f1ff 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -553,6 +553,9 @@ options 	LIBMCHAIN
 # libalias library, performing NAT
 options		LIBALIAS
 
+# flowtable cache
+options		FLOWTABLE
+
 #
 # SCTP is a NEW transport protocol defined by
 # RFC2960 updated by RFC3309 and RFC3758.. and
diff --git a/sys/conf/files b/sys/conf/files
index 9bb1480..17847b4 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -2145,6 +2145,7 @@ net/bpf_jitter.c		optional bpf_jitter
 net/bpf_filter.c		optional bpf | netgraph_bpf
 net/bpf_zerocopy.c		optional bpf
 net/bridgestp.c			optional bridge | if_bridge
+net/flowtable.c			optional flowtable
 net/ieee8023ad_lacp.c		optional lagg
 net/if.c			standard
 net/if_arcsubr.c		optional arcnet
diff --git a/sys/conf/options b/sys/conf/options
index e95b84d..ade971b 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -417,6 +417,7 @@ TCP_OFFLOAD_DISABLE	opt_inet.h #Disable code to dispatch tcp offloading
 TCP_SIGNATURE		opt_inet.h
 VLAN_ARRAY		opt_vlan.h
 XBONEHACK
+FLOWTABLE		opt_route.h
 
 #
 # SCTP