netdev - Re: [PATCH net-next v2 1/2] nsh: encapsulation module

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Message-ID: <20160217033132.GA47212@ast-mbp.thefacebook.com>
Date:	Tue, 16 Feb 2016 19:31:33 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Brian Russell <brussell@...cade.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/2] nsh: encapsulation module

On Thu, Feb 11, 2016 at 07:57:05PM +0000, Brian Russell wrote:
> Support encap/decap of Network Service Header (NSH) as defined in
> https://tools.ietf.org/html/draft-ietf-sfc-nsh-01
> 
> Includes support for Type 1 and Type 2 metadata and a simple registration
> for listeners to see decapsulated packets based on the Type/Class.
> 
> Signed-off-by: Brian Russell <brussell@...cade.com>
...
> +int nsh_register_listener(struct nsh_listener *listener)
> +{
> +	if (listener->max_ctx_hdrs > limit_ctx_hdrs)
> +		return -ENOMEM;
> +
> +	mutex_lock(&nsh_listener_mutex);
> +	list_add(&listener->list, &nsh_listeners);
> +	mutex_unlock(&nsh_listener_mutex);
> +	return 0;
> +}
> +EXPORT_SYMBOL(nsh_register_listener);
> +EXPORT_SYMBOL(nsh_unregister_listener);

looks like this patch doesn't actually implement the protocol,
but rather provides a placeholder for out of tree modules?