netdev - [patch net-next 0/6] ipv4: fib: Provide per-nexthop offload indication

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Date:   Wed,  2 Aug 2017 09:56:00 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com, mlxsw@...lanox.com,
        dsahern@...il.com, roopa@...ulusnetworks.com,
        nikolay@...ulusnetworks.com, hannes@...essinduktion.org,
        yoshfuji@...ux-ipv6.org, kuznet@....inr.ac.ru
Subject: [patch net-next 0/6] ipv4: fib: Provide per-nexthop offload indication

From: Jiri Pirko <jiri@...lanox.com>

Ido says:

Offload indication for IPv4 routes is currently set in the FIB info's
flags. When multipath routes are employed, this can lead to a route being
marked as offloaded although only one of its nexthops is actually
offloaded.

Instead, this patchset aims to proivde a higher resolution for the offload
indication and report it on a per-nexthop basis.

Example output from patched iproute:

$ ip route show 192.168.200.0/24
192.168.200.0/24
        nexthop via 192.168.100.2 dev enp3s0np7 weight 1 offload
        nexthop via 192.168.101.3 dev enp3s0np8 weight 1

And once the second gateway is resolved:

$ ip route show 192.168.200.0/24
192.168.200.0/24
        nexthop via 192.168.100.2 dev enp3s0np7 weight 1 offload
        nexthop via 192.168.101.3 dev enp3s0np8 weight 1 offload

First patch teaches the kernel to look for the offload indication in the
nexthop flags. Patches 2-5 adjust current capable drivers to provide
offload indication on a per-nexthop basis. Last patch removes no longer
used functions to set offload indication in the FIB info's flags.

Ido Schimmel (6):
  ipv4: fib: Set offload indication according to nexthop flags
  rocker: Provide offload indication using nexthop flags
  mlxsw: spectrum_router: Provide offload indication using nexthop flags
  mlxsw: spectrum_router: Don't check state when refreshing offload
    indication
  mlxsw: spectrum_router: Refresh offload indication upon group refresh
  ipv4: fib: Remove unused functions

 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 73 ++++++++++++++++++----
 drivers/net/ethernet/rocker/rocker_ofdpa.c         |  6 +-
 include/net/ip_fib.h                               | 13 ----
 net/ipv4/fib_semantics.c                           |  2 +
 4 files changed, 65 insertions(+), 29 deletions(-)

-- 
2.9.3