Re: [PATCH RFC net] net: dsa: mv88e6xxx: allow use of PHYs on CPU and DSA ports

Martyn Welch reports that his CPU port is unable to link where it has
been necessary to use one of the switch ports with an internal PHY for
the CPU port. The reason behind this is the port control register is
left forcing the link down, preventing traffic flow.

This occurs because during initialisation, phylink expects the link to
be down, and DSA forces the link down by synthesising a call to the
DSA drivers phylink_mac_link_down() method, but we don't touch the
forced-link state when we later reconfigure the port.

Resolve this by also unforcing the link state when we are operating in
PHY mode and the PPU is set to poll the PHY to retrieve link status
information.

Reported-by: Martyn Welch <redacted>
Signed-off-by: Russell King (Oracle) <redacted>
---
This patch requires:
https://lore.kernel.org/r/E1muXm7-00EwJB-7n@rmk-PC.armlinux.org.uk (local)

If we convert Marvell DSA filly to split PCS (we have 6185 and 6352
complete, 6390 and 6393 remain), the "legacy_march2020" patches, and
the phylink get_caps patches, we can then make Marvell DSA a non-
legacy phylink driver. This gives much cleaner semantics concerning
when the phylink_mac_config() method is called. Specifically, being
non-legacy means phylink_mac_config() will no longer be called just
before every phylink_mac_link_up() method call, and will not be called
for in-band advertisement changes.

This means that phylink_mac_config() will only be called when the port
needs to be reconfigured, which allows drivers to force the link down
for safe reconfiguration without potentially causing an infinite loop
of link-down link-up events that can occur with the legacy behaviour.

Thus, being non-legacy and allowing the forcing removes the need for
DSA to synthesise a call to phylink_mac_link_down() at initialisation
time for this driver... but we need all DSA drivers to be non-legacy
before we can safely remove that.

 drivers/net/dsa/mv88e6xxx/chip.c | 56 +++++++++++++++++++-------------
 1 file changed, 34 insertions(+), 22 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c

b/drivers/net/dsa/mv88e6xxx/chip.c
index 9f675464efc3..b033e653d3f4 100644

--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c

@@ -698,7 +698,7 @@ static void mv88e6xxx_mac_config(struct dsa_switch

*ds, int port,
 {
        struct mv88e6xxx_chip *chip = ds->priv;
        struct mv88e6xxx_port *p;
-       int err;
+       int err = 0;
 
        p = &chip->ports[port];
 

@@ -711,31 +711,43 @@ static void mv88e6xxx_mac_config(struct

dsa_switch *ds, int port,
                return;
 
        mv88e6xxx_reg_lock(chip);
-       /* In inband mode, the link may come up at any time while the
link
-        * is not forced down. Force the link down while we reconfigure
the
-        * interface mode.
-        */
-       if (mode == MLO_AN_INBAND && p->interface != state->interface
&&
-           chip->info->ops->port_set_link)
-               chip->info->ops->port_set_link(chip, port,
LINK_FORCED_DOWN);
 
-       err = mv88e6xxx_port_config_interface(chip, port, state-

quoted

interface);

-       if (err && err != -EOPNOTSUPP)
-               goto err_unlock;
-
-       err = mv88e6xxx_serdes_pcs_config(chip, port, mode, state-

quoted

interface,

-                                         state->advertising);
-       /* FIXME: we should restart negotiation if something changed -
which
-        * is something we get if we convert to using phylinks PCS
operations.
-        */
-       if (err > 0)
-               err = 0;
+       if (mode != MLO_AN_PHY || !mv88e6xxx_phy_is_internal(ds, port))
{
+               /* In inband mode, the link may come up at any time
while the
+                * link is not forced down. Force the link down while
we
+                * reconfigure the interface mode.
+                */
+               if (mode == MLO_AN_INBAND &&
+                   p->interface != state->interface &&
+                   chip->info->ops->port_set_link)
+                       chip->info->ops->port_set_link(chip, port,
+                                                     
LINK_FORCED_DOWN);
+
+               err = mv88e6xxx_port_config_interface(chip, port,
+                                                     state-

quoted

interface);

+               if (err && err != -EOPNOTSUPP)
+                       goto err_unlock;
+
+               err = mv88e6xxx_serdes_pcs_config(chip, port, mode,
+                                                 state->interface,
+                                                 state->advertising);
+               /* FIXME: we should restart negotiation if something
changed -
+                * which is something we get if we convert to using
phylinks
+                * PCS operations.
+                */
+               if (err > 0)
+                       err = 0;
+       }
 
        /* Undo the forced down state above after completing
configuration
-        * irrespective of its state on entry, which allows the link to
come up.
+        * irrespective of its state on entry, which allows the link to
come
+        * up in the in-band case where there is no separate SERDES.
Also
+        * ensure that the link can come up if the PPU is in use and we
are
+        * in PHY mode (we treat the PPU as an effective in-band
mechanism.)
         */
-       if (mode == MLO_AN_INBAND && p->interface != state->interface
&&
-           chip->info->ops->port_set_link)
+       if (chip->info->ops->port_set_link &&
+           ((mode == MLO_AN_INBAND && p->interface != state-

quoted

interface) ||

+            (mode == MLO_AN_PHY && mv88e6xxx_port_ppu_updates(chip,
port))))
                chip->info->ops->port_set_link(chip, port,
LINK_UNFORCED);
 
        p->interface = state->interface;