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

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: 34c5880de94c ("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>

diff --git a/net/dsa/port.c b/net/dsa/port.c
index 2dd76eb1621c74b514f3e0480a688da7ff44627b..a8895ee3cd600ca8cfd1cc88a6614a910cc76b7f 100644 (file)
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -145,11 +145,14 @@ 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_set_mst_state(struct dsa_port *dp,