From b5e33a1571580430ff4c7bd5b176d0450e9918db Mon Sep 17 00:00:00 2001 From: Horatiu Vultur Date: Thu, 19 Aug 2021 19:49:57 +0300 Subject: [PATCH 1/2] net: mscc: ocelot: be able to reuse a devlink_port after teardown There are cases where we would like to continue probing the switch even if one port has failed to probe. When that happens, we need to unregister a devlink_port of type DEVLINK_PORT_FLAVOUR_PHYSICAL and re-register it of type DEVLINK_PORT_FLAVOUR_UNUSED. This is fine, except when calling devlink_port_attrs_set on a structure on which devlink_port_register has been previously called, there is a WARN_ON in devlink_port_attrs_set that devlink_port->devlink must be NULL. So don't assume that the memory behind dlp is clean when calling ocelot_port_devlink_init, just zero-initialize it. Signed-off-by: Horatiu Vultur Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- drivers/net/ethernet/mscc/ocelot_net.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c index 5e8965be968a..9044737936d2 100644 --- a/drivers/net/ethernet/mscc/ocelot_net.c +++ b/drivers/net/ethernet/mscc/ocelot_net.c @@ -164,6 +164,7 @@ int ocelot_port_devlink_init(struct ocelot *ocelot, int port, struct devlink *dl = ocelot->devlink; struct devlink_port_attrs attrs = {}; + memset(dlp, 0, sizeof(*dlp)); memcpy(attrs.switch_id.id, &ocelot->base_mac, id_len); attrs.switch_id.id_len = id_len; attrs.phys.port_number = port; From 5c8bb71dbdf816f9da7447557070d344edca8942 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Thu, 19 Aug 2021 19:49:58 +0300 Subject: [PATCH 2/2] net: mscc: ocelot: allow probing to continue with ports that fail to register The existing ocelot device trees, like ocelot_pcb123.dts for example, have SERDES ports (ports 4 and higher) that do not have status = "disabled"; but on the other hand do not have a phy-handle or a fixed-link either. So from the perspective of phylink, they have broken DT bindings. Since the blamed commit, probing for the entire switch will fail when such a device tree binding is encountered on a port. There used to be this piece of code which skipped ports without a phy-handle: phy_node = of_parse_phandle(portnp, "phy-handle", 0); if (!phy_node) continue; but now it is gone. Anyway, fixed-link setups are a thing which should work out of the box with phylink, so it would not be in the best interest of the driver to add that check back. Instead, let's look at what other drivers do. Since commit 86f8b1c01a0a ("net: dsa: Do not make user port errors fatal"), DSA continues after a switch port fails to register, and works only with the ports that succeeded. We can achieve the same behavior in ocelot by unregistering the devlink port for ports where ocelot_port_phylink_create() failed (called via ocelot_probe_port), and clear the bit in devlink_ports_registered for that port. This will make the next iteration reconsider the port that failed to probe as an unused port, and re-register a devlink port of type UNUSED for it. No other cleanup should need to be performed, since ocelot_probe_port() should be self-contained when it fails. Fixes: e6e12df625f2 ("net: mscc: ocelot: convert to phylink") Reported-and-tested-by: Horatiu Vultur Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- drivers/net/ethernet/mscc/ocelot_vsc7514.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/mscc/ocelot_vsc7514.c b/drivers/net/ethernet/mscc/ocelot_vsc7514.c index 18aed504f45d..291ae6817c26 100644 --- a/drivers/net/ethernet/mscc/ocelot_vsc7514.c +++ b/drivers/net/ethernet/mscc/ocelot_vsc7514.c @@ -978,14 +978,15 @@ static int mscc_ocelot_init_ports(struct platform_device *pdev, of_node_put(portnp); goto out_teardown; } - devlink_ports_registered |= BIT(port); err = ocelot_probe_port(ocelot, port, target, portnp); if (err) { - of_node_put(portnp); - goto out_teardown; + ocelot_port_devlink_teardown(ocelot, port); + continue; } + devlink_ports_registered |= BIT(port); + ocelot_port = ocelot->ports[port]; priv = container_of(ocelot_port, struct ocelot_port_private, port);