netdev - [RFC PATCH net-next 0/5] Support for fdb ECMP nexthop groups

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Message-Id: <1588631301-21564-1-git-send-email-roopa@cumulusnetworks.com>
Date:   Mon,  4 May 2020 15:28:16 -0700
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     dsahern@...il.com, davem@...emloft.net
Cc:     netdev@...r.kernel.org, nikolay@...ulusnetworks.com,
        idosch@...lanox.com, jiri@...lanox.com, petrm@...lanox.com
Subject: [RFC PATCH net-next 0/5] Support for fdb ECMP nexthop groups

From: Roopa Prabhu <roopa@...ulusnetworks.com>

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.

example:
$ip nexthop add id 12 via 172.16.1.2 fdb
$ip nexthop add id 13 via 172.16.1.3 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 https://tools.ietf.org/html/rfc7432
[2] E-VPN VxLAN: https://tools.ietf.org/html/rfc8365
[3] LPC talk with mention of nexthop groups for L2 ecmp
http://vger.kernel.org/lpc_net2018_talks/scaling_bridge_fdb_database_slidesV3.pdf

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                         | 319 ++++++++++++++++++++++------
 include/net/netns/nexthop.h                 |   1 +
 include/net/nexthop.h                       |  26 +++
 include/uapi/linux/neighbour.h              |   1 +
 include/uapi/linux/nexthop.h                |   1 +
 net/ipv4/nexthop.c                          | 127 +++++++++--
 tools/testing/selftests/net/fib_nexthops.sh |  77 ++++++-
 7 files changed, 464 insertions(+), 88 deletions(-)

-- 
2.1.4