From: Petr Machata <pe...@mellanox.com>
Date: Wed, 05 Sep 2018 12:16:00 +0200
> MC-aware mode was recently enabled by mlxsw on Spectrum switches in
> commit 7b8195306694 ("mlxsw: spectrum: Configure MC-aware mode on mlxsw
> ports"). Unfortunately, testing has shown that the fix is incomplete and
> in the presented form actually makes the problem even worse, because any
> amount of MC traffic causes UC disruption.
>
> The reason for this is that currently, mlxsw configures the MC-specific
> TCs (8..15) to map to pool 0. It also configures a maximum buffer size
> of 0, but for MC traffic that maximum is disregarded and not part of the
> quota. Therefore MC traffic is always admitted to the egress buffer.
>
> Fix the configuration by directing the MC TCs into pool 15, which is
> dedicated to MC traffic and recognized as such by the silicon.
>
> Fixes: 7b8195306694 ("mlxsw: spectrum: Configure MC-aware mode on mlxsw
> ports")
> Signed-off-by: Petr Machata <pe...@mellanox.com>
> Acked-by: Jiri Pirko <j...@mellanox.com>
Applied, thank you.
