mlxsw: spectrum: Set port's shared buffer size to 0

idosch · davem330 · commit d6b7c13b018f · 2016-04-06T17:24:17.000-04:00
In addition to the priority group (PG) buffers in the headroom, the
device enables the allocation of headroom shared buffer, which can
be shared between different PGs.

However, we are not going to use the headroom shared buffer and instead
allow the user to use its size for PGs or the switch's shared buffer.

Signed-off-by: Ido Schimmel &lt;idosch@mellanox.com&gt;
Signed-off-by: Jiri Pirko &lt;jiri@mellanox.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -2455,6 +2455,8 @@ MLXSW_ITEM32(reg, pbmc, xoff_timer_value, 0x04, 16, 16);
  */
 MLXSW_ITEM32(reg, pbmc, xoff_refresh, 0x04, 0, 16);
 
+#define MLXSW_REG_PBMC_PORT_SHARED_BUF_IDX 11
+
 /* reg_pbmc_buf_lossy
  * The field indicates if the buffer is lossy.
  * 0 - Lossless
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
@@ -80,6 +80,8 @@ static int mlxsw_sp_port_pb_init(struct mlxsw_sp_port *mlxsw_sp_port)
 		pb = &mlxsw_sp_pbs[i];
 		mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl, pb->index, pb->size);
 	}
+	mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl,
+					 MLXSW_REG_PBMC_PORT_SHARED_BUF_IDX, 0);
 	return mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core,
 			       MLXSW_REG(pbmc), pbmc_pl);
 }

Original file line number	Diff line number	Diff line change
`@@ -80,6 +80,8 @@ static int mlxsw_sp_port_pb_init(struct mlxsw_sp_port *mlxsw_sp_port)`
`80`	`80`	`pb = &mlxsw_sp_pbs[i];`
`81`	`81`	`mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl, pb->index, pb->size);`
`82`	`82`	`}`
	`83`	`+ mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl,`
	`84`	`+ MLXSW_REG_PBMC_PORT_SHARED_BUF_IDX, 0);`
`83`	`85`	`return mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core,`
`84`	`86`	`MLXSW_REG(pbmc), pbmc_pl);`
`85`	`87`	`}`