From: Christophe Gouault <redacted>
Date: Fri,  1 Aug 2014 11:12:26 +0200

This patchset enables to hash more policies than just non-prefixed
ones: hash policies whose prefix lengths are greater or equal to
configurable thresholds.

These thresholds are configured via netlink message
XFRM_MSG_NEWSPDINFO, attributes XFRMA_SPD_IPV4_HTHRESH and
XFRMA_SPD_IPV6_HTHRESH.

The related iproute2 patch for configuring the thresholds is available
on demand.

Since this is not urgent, and a new feature, I'll let Steffen review this
when he gets back.