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

On 3/27/17 9:08 PM, Eric W. Biederman wrote:

Overall I like what is being accomplished by this patchset.
I especially like the fact that the forwarding path is left
essentially unchanged, and that the struct mpls_route shirnks a little
for the common case.

I believe we should just kill MAX_NEW_LABELS.

I think the only significant change from your patch is the removal of an
array from mpls_route_config.

With the removal of MAX_NEW_LABELS I would replace it by a sanity check
in mpls_rt_alloc that verifies that the amount we are going to allocate
for struct mpls_route is < PAGE_SIZE.  Anything larger is just
asking for trouble.

Sure. We would want a consistent API across architectures. As I recall
some of them have 64kB page sizes, so rather than page size let's limit
to the number 4096 rather than PAGE_SIZE.

That should put our practical limit just a little bit below 32 nexthops
adding 32 labels each.

I send out a v2 soon.