net: dsa: don't warn in dsa_port_set_state_now() when driver doesn't support it

BugLink: https://bugs.launchpad.net/bugs/1990564
commit 211987f3ac734000ea1548784b2a4539a974fbc8 upstream.

ds->ops->port_stp_state_set() is, like most DSA methods, optional, and
if absent, the port is supposed to remain in the forwarding state (as
standalone). Such is the case with the mv88e6060 driver, which does not
offload the bridge layer. DSA warns that the STP state can't be changed
to FORWARDING as part of dsa_port_enable_rt(), when in fact it should not.

The error message is also not up to modern standards, so take the
opportunity to make it more descriptive.

Fixes: fd3645413197 ("net: dsa: change scope of STP state setter")
Reported-by: Sergei Antonov <saproj@gmail.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Sergei Antonov <saproj@gmail.com>
Link: https://lore.kernel.org/r/20220816201445.1809483-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/net/dsa/port.c b/net/dsa/port.c
index 63e88de96393640c90f365947b7828bc8bfca7ee..a21015d6bd3651cbd73dec5578feeba0d753a7d4 100644 (file)
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -111,11 +111,14 @@ int dsa_port_set_state(struct dsa_port *dp, u8 state, bool do_fast_age)
 static void dsa_port_set_state_now(struct dsa_port *dp, u8 state,
                                   bool do_fast_age)
 {
+       struct dsa_switch *ds = dp->ds;
        int err;
 
        err = dsa_port_set_state(dp, state, do_fast_age);
-       if (err)
-               pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
+       if (err && err != -EOPNOTSUPP) {
+               dev_err(ds->dev, "port %d failed to set STP state %u: %pe\n",
+                       dp->index, state, ERR_PTR(err));
+       }
 }
 
 int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy)