From: Jiri Pirko <j...@resnulli.us>
Date: Sun, 8 Oct 2017 11:53:26 +0200
> From: Ido Schimmel <ido...@mellanox.com>
>
> In commit fc922bb0dd94 ("mlxsw: spectrum_router: Use one LPM tree for
> all virtual routers") I increased the scale of supported VRFs by having
> all of them share the same LPM tree.
>
> In order to avoid look-ups for prefix lengths that don't exist, each
> route removal would trigger an aggregation across all the active virtual
> routers to see which prefix lengths are in use and which aren't and
> structure the tree accordingly.
>
> With the way the data structures are currently laid out, this is a very
> expensive operation. When preformed repeatedly - due to the invocation
> of the abort mechanism - and with enough VRFs, this can result in a hung
> task.
>
> For now, avoid this optimization until it can be properly re-added in
> net-next.
>
> Fixes: fc922bb0dd94 ("mlxsw: spectrum_router: Use one LPM tree for all
> virtual routers")
> Signed-off-by: Ido Schimmel <ido...@mellanox.com>
> Reported-by: David Ahern <d...@cumulusnetworks.com>
> Tested-by: David Ahern <d...@cumulusnetworks.com>
> Signed-off-by: Jiri Pirko <j...@mellanox.com>
Applied.
