Rework if_gif(4) to use new encap_lookup_t method to speedup lookup

of needed interface when many gif interfaces are present.

Remove rmlock from gif_softc, use epoch(9) and CK_LIST instead.
Move more AF-related code into AF-related locations.
Use hash table to speedup lookup of needed softc. Interfaces
with GIF_IGNORE_SOURCE flag are stored in plain CK_LIST.
Sysctl net.link.gif.parallel_tunnels is removed. The removal was planed
16 years ago, and actually it could work only for outbound direction.
Each protocol, that can be handled by if_gif(4) interface is registered
by separate encap handler, this helps avoid invoking the handler
for unrelated protocols (GRE, PIM, etc.).

This change allows dramatically improve performance when many gif(4)
interfaces are used.

Sponsored by:	Yandex LLC

1 files changed, 1 insertions, 9 deletions

diff --git a/share/man/man4/gif.4 b/share/man/man4/gif.4
index 76b7976e7ff9..752282bcf830 100644
--- a/share/man/man4/gif.4
+++ b/share/man/man4/gif.4
@@ -29,7 +29,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd September 10, 2015
+.Dd June 5, 2018
 .Dt GIF 4
 .Os
 .Sh NAME
@@ -169,14 +169,6 @@ This behavior may be modified at runtime by setting the
 variable
 .Va net.link.gif.max_nesting
 to the desired level of nesting.
-Additionally,
-.Nm
-tunnels are restricted to one per pair of end points.
-Parallel tunnels may be enabled by setting the
-.Xr sysctl 8
-variable
-.Va net.link.gif.parallel_tunnels
-to 1.
 .Sh SEE ALSO
 .Xr gre 4 ,
 .Xr inet 4 ,