mlxsw: spectrum: Adjust headroom buffers for 8x ports

[platform/kernel/linux-starfive.git] / drivers / net / ethernet / mellanox / mlxsw / spectrum.h

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index 6f96ca5..6e87457 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -374,6 +374,19 @@ mlxsw_sp_port_vlan_find_by_vid(const struct mlxsw_sp_port *mlxsw_sp_port,
        return NULL;
 }
 
+static inline void
+mlxsw_sp_port_headroom_8x_adjust(const struct mlxsw_sp_port *mlxsw_sp_port,
+                                u16 *p_size)
+{
+       /* Ports with eight lanes use two headroom buffers between which the
+        * configured headroom size is split. Therefore, multiply the calculated
+        * headroom size by two.
+        */
+       if (mlxsw_sp_port->mapping.width != 8)
+               return;
+       *p_size *= 2;
+}
+
 enum mlxsw_sp_flood_type {
        MLXSW_SP_FLOOD_TYPE_UC,
        MLXSW_SP_FLOOD_TYPE_BC,