netdev - Re: [PATCH net-next 3/7] mpls: Add a sysctl to control the size of the mpls label table

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Date:	Thu, 5 Mar 2015 01:45:55 -0800
From:	Vivek Venkatraman <vivek@...ulusnetworks.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	roopa <roopa@...ulusnetworks.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	santiago@...reenet.org, Simon Horman <horms@...ge.net.au>
Subject: Re: [PATCH net-next 3/7] mpls: Add a sysctl to control the size of
 the mpls label table

On Tue, Mar 3, 2015 at 5:11 PM, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> This sysctl gives two benefits.  By defaulting the table size to 0
> mpls even when compiled in and enabled defaults to not forwarding
> any packets.  This prevents unpleasant surprises for users.
>
> The other benefit is that as mpls labels are allocated locally a dense
> table a small dense label table may be used which saves memory and
> is extremely simple and efficient to implement.
>

The label space is often partitioned into multiple sets in MPLS and
used for different purposes - for example, LSP labels, VPN labels,
Segment labels. This in turn means that the table may no longer be
dense. A sysctl allowing min and max label that spans the sets of
labels may be useful. Or should the ILM be made a hash table?

> This sysctl allows userspace to choose the restrictions on the label
> table size userspace applications need to cope with.
>

Vivek
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