[PATCH net-next v3 0/3] ipv4: Flush the FIB once on multiple nexthop removal

[Cosmin Ratiu <cratiu@nvidia.com>]

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.

V2 -> V3: https://lore.kernel.org/netdev/8fea4084-c9ec-472a-b8ab-ecc87e537216@kernel.org/T/#t
- Split the patch into 3 (Ido Schimmel, David Ahern)
- Used WARN_ON_ONCE instead of WARN_ON (Ido Schimmel)

V1 -> V2:
- Fixes xmas tree in a couple places (Kuniyuki Iwashima)
- Added __must_check to remove_nexthop_from_groups() (Kuniyuki Iwashima)

Cosmin Ratiu (3):
  ipv4: Provide a FIB flushing signal from nexthop removal functions
  ipv4: Flush the FIB once on multiple nexthop removal
  ipv4: Add __must_check to nexthop removal functions

 net/ipv4/nexthop.c | 88 +++++++++++++++++++++++++++++-----------------
 1 file changed, 56 insertions(+), 32 deletions(-)

-- 
2.53.0