netdev - Re: [patch net-next 1/6] fib: introduce FIB notification infrastructure

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Date:   Thu, 22 Sep 2016 08:13:50 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, idosch@...lanox.com,
        eladr@...lanox.com, yotamg@...lanox.com, nogahf@...lanox.com,
        ogerlitz@...lanox.com, roopa@...ulusnetworks.com,
        nikolay@...ulusnetworks.com, linville@...driver.com,
        andy@...yhouse.net, f.fainelli@...il.com, dsa@...ulusnetworks.com,
        jhs@...atatu.com, vivien.didelot@...oirfairelinux.com,
        andrew@...n.ch, ivecera@...hat.com, kaber@...sh.net,
        john@...ozen.org
Subject: Re: [patch net-next 1/6] fib: introduce FIB notification
 infrastructure

On Wed, Sep 21, 2016 at 01:53:09PM +0200, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...lanox.com>
> 
> This allows to pass information about added/deleted FIB entries/rules to
> whoever is interested. This is done in a very similar way as devinet
> notifies address additions/removals.
> 
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>

[...]

>  #include <linux/slab.h>
>  #include <linux/export.h>
>  #include <linux/vmalloc.h>
> +#include <linux/notifier.h>
>  #include <net/net_namespace.h>
>  #include <net/ip.h>
>  #include <net/protocol.h>
> @@ -84,6 +85,44 @@
>  #include <trace/events/fib.h>
>  #include "fib_lookup.h"
>  
> +static BLOCKING_NOTIFIER_HEAD(fib_chain);
> +
> +int register_fib_notifier(struct notifier_block *nb)
> +{
> +	return blocking_notifier_chain_register(&fib_chain, nb);
> +}
> +EXPORT_SYMBOL(register_fib_notifier);

If we remove and insert the switch driver, then the existing FIB entries
should be replayed when we register our notification block. Otherwise,
all of these entries will be missing from the switch's tables. I believe
it should be handled like register_netdevice_notifier(), where
"registration and up events are replayed".