netdev - [PATCH net-next v3 0/5] Support for fdb ECMP nexthop groups

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1589998991-40120-1-git-send-email-roopa@cumulusnetworks.com>
Date:   Wed, 20 May 2020 11:23:06 -0700
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     dsahern@...il.com, davem@...emloft.net
Cc:     netdev@...r.kernel.org, nikolay@...ulusnetworks.com,
        jiri@...lanox.com, idosch@...lanox.com, petrm@...lanox.com
Subject: [PATCH net-next v3 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

v3 - fix wording in selftest print as pointed out by davidA

v2 -
	- dropped nikolays fixes for nexthop multipath null pointer deref
	  (he will send those separately)
	- added negative tests for route add with fdb nexthop + a few more
	- Fixes for a few  fdb replace conditions found during more testing
	- Moved to rcu_dereference_rtnl in vxlan_fdb_info and consolidate rcu
	  dereferences
	- Fixes to build failures Reported-by: kbuild test robot <lkp@...el.com>
	- DavidA, I am going to send a separate patch for the neighbor code validation
	  for NDA_NH_ID if thats ok.

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                         | 334 ++++++++++++++++++++++------
 include/net/ip6_fib.h                       |   1 +
 include/net/netns/nexthop.h                 |   1 +
 include/net/nexthop.h                       |  44 ++++
 include/net/vxlan.h                         |  25 +++
 include/uapi/linux/neighbour.h              |   1 +
 include/uapi/linux/nexthop.h                |   3 +
 net/core/neighbour.c                        |   2 +
 net/ipv4/nexthop.c                          | 158 ++++++++++---
 net/ipv6/route.c                            |   5 +
 tools/testing/selftests/net/fib_nexthops.sh | 160 ++++++++++++-
 11 files changed, 644 insertions(+), 90 deletions(-)

-- 
2.1.4