Merge branch 'ipv4-flush-the-fib-once-on-multiple-nexthop-removal'

Cosmin Ratiu says:

====================
ipv4: Flush the FIB once on multiple nexthop removal

This series optimizes multiple nexthop removal performance from having
to do a FIB flush for each nexthop being removed to only doing a single
FIB flush after all nexthops are removed.

This dramatically improves performance in scenarios where there are
many nexthops and many ipv4 routes. Please see individual patches for
more details and for a test scenario.
====================

Link: https://patch.msgid.link/20260507075606.322405-1-cratiu@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>