Wed, Apr 10, 2019 at 08:58:17AM CEST, ido...@mellanox.com wrote:
>In Spectrum-1, when a multicast packet is admitted to the shared buffer
>it increases the quotas of all the ports and {port, TC} to which it is
>forwarded to.
>
>The above means that multicast packets are accounted multiple times in
>the shared buffer and can therefore cause the associated shared buffer
>pool to fill up very quickly.
>
>To work around this issue, commit e83c045e53d7 ("mlxsw:
>spectrum_buffers: Configure MC pool") added a dedicated multicast pool
>in which multicast packets are accounted.
>
>The issue is not present in Spectrum-2, but in order to be backward
>compatible with Spectrum-1, its default behavior is to allow a multicast
>packet to increase multiple egress quotas instead of one.
>
>Until the new (non-backward compatible) mode is supported, configure a
>dedicated multicast pool as in Spectrum-1.
>
>Fixes: fe099bf682ab ("mlxsw: spectrum_buffers: Add Spectrum-2 shared buffer
>configuration")
>Signed-off-by: Ido Schimmel <ido...@mellanox.com>
>Reviewed-by: Petr Machata <pe...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
