mlxsw: spectrum: Store local port to module mapping during init

The port netdevs are each associated with a different local port number
in the device. These local ports are grouped into groups of 4 (e.g.
(1-4), (5-8)) called clusters. The cluster constitutes the one of two
possible modules they can be mapped to. This mapping is board-specific
and done by the device's firmware during init.

When splitting a port by 4, the device requires us to first unmap all
the ports in the cluster and then map each to a single lane in the module
associated with the port netdev used as the handle for the operation.
This means that two port netdevs will disappear, as only 100Gb/s (4
lanes) ports can be split and we are guaranteed to have two of these
((1, 3), (5, 7) etc.) in a cluster.

When unsplit occurs we need to reinstantiate the two original 100Gb/s
ports and map each to its origianl module. Therefore, during driver init
store the initial local port to module mapping, so it can be used later
during unsplitting.

Note that a by 2 split doesn't require us to store the mapping, as we
only need to reinstantiate one port whose module is known.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 0dd72f8..240881c 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -305,18 +305,19 @@ mlxsw_sp_port_system_port_mapping_set(struct mlxsw_sp_port *mlxsw_sp_port)
        return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sspr), sspr_pl);
 }
 
-static int mlxsw_sp_port_module_check(struct mlxsw_sp_port *mlxsw_sp_port,
-                                     bool *p_usable)
+static int mlxsw_sp_port_module_info_get(struct mlxsw_sp *mlxsw_sp,
+                                        u8 local_port, u8 *p_module,
+                                        u8 *p_width)
 {
-       struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
        char pmlp_pl[MLXSW_REG_PMLP_LEN];
        int err;
 
-       mlxsw_reg_pmlp_pack(pmlp_pl, mlxsw_sp_port->local_port);
+       mlxsw_reg_pmlp_pack(pmlp_pl, local_port);
        err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(pmlp), pmlp_pl);
        if (err)
                return err;
-       *p_usable = mlxsw_reg_pmlp_width_get(pmlp_pl) ? true : false;
+       *p_module = mlxsw_reg_pmlp_module_get(pmlp_pl, 0);
+       *p_width = mlxsw_reg_pmlp_width_get(pmlp_pl);
        return 0;
 }
 
@@ -1365,7 +1366,6 @@ static int mlxsw_sp_port_create(struct mlxsw_sp *mlxsw_sp, u8 local_port)
        struct mlxsw_sp_port *mlxsw_sp_port;
        struct devlink_port *devlink_port;
        struct net_device *dev;
-       bool usable;
        size_t bytes;
        int err;
 
@@ -1416,19 +1416,6 @@ static int mlxsw_sp_port_create(struct mlxsw_sp *mlxsw_sp, u8 local_port)
         */
        dev->hard_header_len += MLXSW_TXHDR_LEN;
 
-       err = mlxsw_sp_port_module_check(mlxsw_sp_port, &usable);
-       if (err) {
-               dev_err(mlxsw_sp->bus_info->dev, "Port %d: Failed to check module\n",
-                       mlxsw_sp_port->local_port);
-               goto err_port_module_check;
-       }
-
-       if (!usable) {
-               dev_dbg(mlxsw_sp->bus_info->dev, "Port %d: Not usable, skipping initialization\n",
-                       mlxsw_sp_port->local_port);
-               goto port_not_usable;
-       }
-
        devlink_port = &mlxsw_sp_port->devlink_port;
        err = devlink_port_register(devlink, devlink_port, local_port);
        if (err) {
@@ -1496,8 +1483,6 @@ err_port_swid_set:
 err_port_system_port_mapping_set:
        devlink_port_unregister(&mlxsw_sp_port->devlink_port);
 err_devlink_port_register:
-port_not_usable:
-err_port_module_check:
 err_dev_addr_init:
        free_percpu(mlxsw_sp_port->pcpu_stats);
 err_alloc_stats:
@@ -1559,6 +1544,7 @@ static void mlxsw_sp_ports_remove(struct mlxsw_sp *mlxsw_sp)
 static int mlxsw_sp_ports_create(struct mlxsw_sp *mlxsw_sp)
 {
        size_t alloc_size;
+       u8 module, width;
        int i;
        int err;
 
@@ -1568,6 +1554,13 @@ static int mlxsw_sp_ports_create(struct mlxsw_sp *mlxsw_sp)
                return -ENOMEM;
 
        for (i = 1; i < MLXSW_PORT_MAX_PORTS; i++) {
+               err = mlxsw_sp_port_module_info_get(mlxsw_sp, i, &module,
+                                                   &width);
+               if (err)
+                       goto err_port_module_info_get;
+               if (!width)
+                       continue;
+               mlxsw_sp->port_to_module[i] = module;
                err = mlxsw_sp_port_create(mlxsw_sp, i);
                if (err)
                        goto err_port_create;
@@ -1575,6 +1568,7 @@ static int mlxsw_sp_ports_create(struct mlxsw_sp *mlxsw_sp)
        return 0;
 
 err_port_create:
+err_port_module_info_get:
        for (i--; i >= 1; i--)
                mlxsw_sp_port_remove(mlxsw_sp, i);
        kfree(mlxsw_sp->ports);

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index 6bf6dac..a7d86ac 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -123,6 +123,7 @@ struct mlxsw_sp {
        u32 ageing_time;
        struct mlxsw_sp_upper master_bridge;
        struct mlxsw_sp_upper lags[MLXSW_SP_LAG_MAX];
+       u8 port_to_module[MLXSW_PORT_MAX_PORTS];
 };
 
 static inline struct mlxsw_sp_upper *