Re: [PATCH v3 net-next 08/10] net: mscc: ocelot: register devlink ports

On Sat, Jan 09, 2021 at 05:44:39PM -0800, Jakub Kicinski wrote:

On Fri,  8 Jan 2021 19:59:48 +0200 Vladimir Oltean wrote:

quoted

From: Vladimir Oltean <vladimir.oltean@nxp.com>

Add devlink integration into the mscc_ocelot switchdev driver. Only the
probed interfaces are registered with devlink, because for convenience,
struct devlink_port was included into struct ocelot_port_private, which
is only initialized for the ports that are used.

Since we use devlink_port_type_eth_set to link the devlink port to the
net_device, we can as well remove the .ndo_get_phys_port_name and
.ndo_get_port_parent_id implementations, since devlink takes care of
retrieving the port name and number automatically, once
.ndo_get_devlink_port is implemented.

Note that the felix DSA driver is already integrated with devlink by
default, since that is a thing that the DSA core takes care of. This is
the reason why these devlink stubs were put in ocelot_net.c and not in
the common library.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>

quoted

diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
index 2bd2840d88bd..d0d98c6adea8 100644
--- a/drivers/net/ethernet/mscc/ocelot_net.c
+++ b/drivers/net/ethernet/mscc/ocelot_net.c

@@ -8,6 +8,116 @@
 #include "ocelot.h"
 #include "ocelot_vcap.h"
 
+struct ocelot_devlink_private {
+	struct ocelot *ocelot;
+};

Why not make struct ocelot part of devlink_priv?

I am not sure what you mean.

quoted

+static const struct devlink_ops ocelot_devlink_ops = {
+};
+
+static int ocelot_port_devlink_init(struct ocelot *ocelot, int port)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+	int id_len = sizeof(ocelot->base_mac);
+	struct devlink *dl = ocelot->devlink;
+	struct devlink_port_attrs attrs = {};
+	struct ocelot_port_private *priv;
+	struct devlink_port *dlp;
+	int err;
+
+	if (!ocelot_port)
+		return 0;
+
+	priv = container_of(ocelot_port, struct ocelot_port_private, port);
+	dlp = &priv->devlink_port;
+
+	memcpy(attrs.switch_id.id, &ocelot->base_mac, id_len);
+	attrs.switch_id.id_len = id_len;
+	attrs.phys.port_number = port;
+
+	if (priv->dev)
+		attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
+	else
+		attrs.flavour = DEVLINK_PORT_FLAVOUR_UNUSED;
+
+	devlink_port_attrs_set(dlp, &attrs);
+
+	err = devlink_port_register(dl, dlp, port);
+	if (err)
+		return err;
+
+	if (priv->dev)
+		devlink_port_type_eth_set(dlp, priv->dev);

devlink_port_attrs_set() should be called before netdev is registered,
and devlink_port_type_eth_set() after. So this sequence makes me a tad
suspicious.

In particular IIRC devlink's .ndo_get_phys_port_name depends on it,
because udev event needs to carry the right info for interface renaming
to work reliably. No?

If I change the driver's Kconfig from tristate to bool, all is fine,
isn't it?

quoted

+	return 0;
+}
+
+static void ocelot_port_devlink_teardown(struct ocelot *ocelot, int port)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+	struct ocelot_port_private *priv;
+	struct devlink_port *dlp;
+
+	if (!ocelot_port)
+		return;
+
+	priv = container_of(ocelot_port, struct ocelot_port_private, port);
+	dlp = &priv->devlink_port;
+
+	devlink_port_unregister(dlp);
+}
+
+int ocelot_devlink_init(struct ocelot *ocelot)
+{
+	struct ocelot_devlink_private *dl_priv;
+	int port, err;
+
+	ocelot->devlink = devlink_alloc(&ocelot_devlink_ops, sizeof(*dl_priv));
+	if (!ocelot->devlink)
+		return -ENOMEM;
+	dl_priv = devlink_priv(ocelot->devlink);
+	dl_priv->ocelot = ocelot;
+
+	err = devlink_register(ocelot->devlink, ocelot->dev);
+	if (err)
+		goto free_devlink;
+
+	for (port = 0; port < ocelot->num_phys_ports; port++) {
+		err = ocelot_port_devlink_init(ocelot, port);
+		if (err) {
+			while (port-- > 0)
+				ocelot_port_devlink_teardown(ocelot, port);
+			goto unregister_devlink;

nit: should this also be on the error path below?

quoted

+		}
+	}
+
+	return 0;
+
+unregister_devlink:
+	devlink_unregister(ocelot->devlink);
+free_devlink:
+	devlink_free(ocelot->devlink);
+	return err;
+}

quoted

--- a/drivers/net/ethernet/mscc/ocelot_vsc7514.c
+++ b/drivers/net/ethernet/mscc/ocelot_vsc7514.c

@@ -1293,6 +1293,12 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 		}
 	}
 
+	err = ocelot_devlink_init(ocelot);
+	if (err) {
+		mscc_ocelot_release_ports(ocelot);
+		goto out_ocelot_deinit;

No need to add ocelot_deinit_timestamp(ocelot); to the error path?

Yes, the error handling could be better.