netdev - Re: [patch net-next 0/8] ipv4: fib: Allow modules to dump FIB tables

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Date:   Wed, 16 Nov 2016 08:38:13 -0800
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>, idosch@...lanox.com,
        eladr@...lanox.com, yotamg@...lanox.com, nogahf@...lanox.com,
        arkadis@...lanox.com, Or Gerlitz <ogerlitz@...lanox.com>,
        roopa <roopa@...ulusnetworks.com>,
        David Ahern <dsa@...ulusnetworks.com>,
        nikolay@...ulusnetworks.com, Andy Gospodarek <andy@...yhouse.net>,
        vivien.didelot@...oirfairelinux.com, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "Duyck, Alexander H" <alexander.h.duyck@...el.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        "kaber@...sh.net" <kaber@...sh.net>
Subject: Re: [patch net-next 0/8] ipv4: fib: Allow modules to dump FIB tables

On Wed, Nov 16, 2016 at 6:08 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> From: Jiri Pirko <jiri@...lanox.com>
>
> Ido says:
>
> In kernel 4.9 the switchdev-specific FIB offload mechanism was replaced
> by a new FIB notification chain to which modules could register in order
> to be notified about the addition and deletion of FIB entries. The
> motivation for this change was that switchdev drivers need to be able to
> reflect the entire FIB table and not only FIBs configured on top of the
> port netdevs themselves. This is useful in case of in-band management.
>
> The fundamental problem with this approach is that upon registration
> listeners lose all the information previously sent in the chain and
> thus have an incomplete view of the FIB tables, which can result in
> packet loss. This patchset fixes that by introducing a new API to dump
> the FIB tables.
>
> The entire dump process is done under RCU and thus the FIB notification
> chain is converted to be atomic. The listeners are modified accordingly.
> This is done in the first five patches.
>
> The sixth patch adds the dump callback itself and the next patches call
> it from current listeners of the FIB notification chain.
>
> Ido Schimmel (8):
>   ipv4: fib: Export free_fib_info()
>   mlxsw: spectrum_router: Implement FIB offload in delayed work
>   rocker: Implement FIB offload in delayed work
>   ipv4: fib: Convert FIB notification chain to be atomic
>   net: ipv4: Send notifications only after removing FIB alias
>   ipv4: fib: Add an API to request a FIB dump
>   mlxsw: spectrum_router: Request a dump of FIB tables during init
>   rocker: Request a dump of FIB tables during init
>
>  drivers/net/ethernet/mellanox/mlxsw/core.c         |   6 +
>  drivers/net/ethernet/mellanox/mlxsw/core.h         |   1 +
>  .../net/ethernet/mellanox/mlxsw/spectrum_router.c  |  73 ++++++++++--
>  drivers/net/ethernet/rocker/rocker_main.c          |  59 ++++++++--
>  drivers/net/ethernet/rocker/rocker_ofdpa.c         |   1 +
>  include/net/ip_fib.h                               |   1 +
>  net/ipv4/fib_semantics.c                           |   1 +
>  net/ipv4/fib_trie.c                                | 128 +++++++++++++++++++--
>  8 files changed, 242 insertions(+), 28 deletions(-)
>

So for the pieces related to the fib_trie itself this patch series
looks good to me.

Acked-by: Alexander Duyck <alexander.h.duyck@...el.com>