netdev - Re: [PATCH net-next 0/4] net: mpls: Allow users to configure more labels per route

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Date:   Tue, 28 Mar 2017 10:59:58 +0100
From:   Robert Shearman <rshearma@...cade.com>
To:     David Ahern <dsa@...ulusnetworks.com>, <netdev@...r.kernel.org>
CC:     <roopa@...ulusnetworks.com>, <ebiederm@...ssion.com>
Subject: Re: [PATCH net-next 0/4] net: mpls: Allow users to configure more
 labels per route

On 25/03/17 17:03, David Ahern wrote:
> Bump the maximum number of labels for MPLS routes from 2 to 12. To keep
> memory consumption in check the labels array is moved to the end of mpls_nh
> and mpls_iptunnel_encap structs as a 0-sized array. Allocations use the
> maximum number of labels across all nexthops in a route for LSR and the
> number of labels configured for LWT.
>
> The mpls_route layout is changed to:
...
> Meaning the via follows its mpls_nh providing better locality as the
> number of labels increases. UDP_RR tests with namespaces shows no impact
> to a modest performance increase with this layout for 1 or 2 labels and
> 1 or 2 nexthops.
>
> The new limit is set to 12 to cover all currently known segment
> routing use cases.
>
> David Ahern (4):
>   mpls: Convert number of nexthops to u8
>   net: mpls: change mpls_route layout
>   net: mpls: bump maximum number of labels
>   net: mpls: Increase max number of labels for lwt encap
>
>  include/net/mpls_iptunnel.h |   4 +-
>  net/mpls/af_mpls.c          | 108 ++++++++++++++++++++++++++------------------
>  net/mpls/internal.h         |  52 ++++++++++++++-------
>  net/mpls/mpls_iptunnel.c    |  13 ++++--
>  4 files changed, 112 insertions(+), 65 deletions(-)
>

Acked-by: Robert Shearman <rshearma@...cade.com>