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Date:   Mon, 18 May 2020 19:14:28 -0700
From:   Roopa Prabhu <>
Subject: [PATCH net-next 0/6] Support for fdb ECMP nexthop groups

From: Roopa Prabhu <>

This series introduces ecmp nexthops and nexthop groups
for mac fdb entries. In subsequent patches this is used
by the vxlan driver fdb entries. The use case is
E-VPN multihoming [1,2,3] which requires bridged vxlan traffic
to be load balanced to remote switches (vteps) belonging to
the same multi-homed ethernet segment (This is analogous to
a multi-homed LAG but over vxlan).

Changes include new nexthop flag NHA_FDB for nexthops
referenced by fdb entries. These nexthops only have ip.
The patches make sure that routes dont reference such nexthops.

$ip nexthop add id 12 via fdb
$ip nexthop add id 13 via fdb
$ip nexthop add id 102 group 12/13 fdb

$bridge fdb add 02:02:00:00:00:13 dev vxlan1000 nhid 101 self

[1] E-VPN
[2] E-VPN VxLAN:
[3] LPC talk with mention of nexthop groups for L2 ecmp

Nikolay Aleksandrov (1):
  nexthop: dereference nh only once in nexthop_select_path

Roopa Prabhu (5):
  nexthop: support for fdb ecmp nexthops
  vxlan: ecmp support for mac fdb entries
  nexthop: add support for notifiers
  vxlan: support for nexthop notifiers
  selftests: net: add fdb nexthop tests

 drivers/net/vxlan.c                         | 318 ++++++++++++++++++++++------
 include/net/ip6_fib.h                       |   1 +
 include/net/netns/nexthop.h                 |   1 +
 include/net/nexthop.h                       |  44 ++++
 include/net/vxlan.h                         |  24 +++
 include/uapi/linux/neighbour.h              |   1 +
 include/uapi/linux/nexthop.h                |   3 +
 net/core/neighbour.c                        |   2 +
 net/ipv4/nexthop.c                          | 170 ++++++++++++---
 net/ipv6/route.c                            |   5 +
 tools/testing/selftests/net/ | 140 +++++++++++-
 11 files changed, 617 insertions(+), 92 deletions(-)


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