Merge branch 'net-phylink-fix-pcs-without-autoneg'

Russell King says:

====================
net: phylink: fix PCS without autoneg

Eric Woudstra reported that a PCS attached using 2500base-X does not
see link when phylink is using in-band mode, but autoneg is disabled,
despite there being a valid 2500base-X signal being received. We have
these settings:

	act_link_an_mode = MLO_AN_INBAND
	pcs_neg_mode = PHYLINK_PCS_NEG_INBAND_DISABLED

Eric diagnosed it to phylink_decode_c37_word() setting state->link
false because the full-duplex bit isn't set in the non-existent link
partner advertisement word (which doesn't exist because in-band
autoneg is disabled!)

The test in phylink_mii_c22_pcs_decode_state() is supposed to catch
this state, but since we converted PCS to use neg_mode, testing the
Autoneg in the local advertisement is no longer sufficient - we need
to be looking at the neg_mode, which currently isn't provided.

We need to provide this via the .pcs_get_state() method, and this
will require modifying all PCS implementations to add the extra
argument to this method.

Patch 1 uses the PCS neg_mode in phylink_mac_pcs_get_state() to correct
the now obsolute usage of the Autoneg bit in the advertisement.

Patch 2 passes neg_mode into the .pcs_get_state() method, and updates
all users.

Patch 3 adds neg_mode as an argument to the various clause 22 state
decoder functions in phylink, modifying drivers to pass the neg_mode
through.

Patch 4 makes use of phylink_mii_c22_pcs_decode_state() rather than
using the Autoneg bit in the advertising field.

Patch 5 may be required for Eric's case - it ensures that we report
the correct state for interface types that we support only one set
of modes for when autoneg is disabled.
====================

Link: https://patch.msgid.link/Z4TbR93B-X8A8iHe@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kuba-moo

drivers/net/dsa/b53/b53_serdes.c

@@ -99,8 +99,8 @@ static void b53_serdes_an_restart(struct phylink_pcs *pcs)
 			 SERDES_MII_BLK, reg);
 }
 
-static void b53_serdes_get_state(struct phylink_pcs *pcs,
-				  struct phylink_link_state *state)
+static void b53_serdes_get_state(struct phylink_pcs *pcs, unsigned int neg_mode,
+				 struct phylink_link_state *state)
 {
 	struct b53_device *dev = pcs_to_b53_pcs(pcs)->dev;
 	u8 lane = pcs_to_b53_pcs(pcs)->lane;

drivers/net/dsa/mt7530.c

@@ -2994,7 +2994,7 @@ static int mt753x_pcs_validate(struct phylink_pcs *pcs,
 	return 0;
 }
 
-static void mt7530_pcs_get_state(struct phylink_pcs *pcs,
+static void mt7530_pcs_get_state(struct phylink_pcs *pcs, unsigned int neg_mode,
 				 struct phylink_link_state *state)
 {
 	struct mt7530_priv *priv = pcs_to_mt753x_pcs(pcs)->priv;

drivers/net/dsa/mv88e6xxx/pcs-6185.c

@@ -55,6 +55,7 @@ static irqreturn_t mv88e6185_pcs_handle_irq(int irq, void *dev_id)
 }
 
 static void mv88e6185_pcs_get_state(struct phylink_pcs *pcs,
+				    unsigned int neg_mode,
 				    struct phylink_link_state *state)
 {
 	struct mv88e6185_pcs *mpcs = pcs_to_mv88e6185_pcs(pcs);

drivers/net/dsa/mv88e6xxx/pcs-6352.c

@@ -158,6 +158,7 @@ static void marvell_c22_pcs_disable(struct phylink_pcs *pcs)
 }
 
 static void marvell_c22_pcs_get_state(struct phylink_pcs *pcs,
+				      unsigned int neg_mode,
 				      struct phylink_link_state *state)
 {
 	struct marvell_c22_pcs *mpcs = pcs_to_marvell_c22_pcs(pcs);

drivers/net/dsa/mv88e6xxx/pcs-639x.c

@@ -257,6 +257,7 @@ static int mv88e639x_sgmii_pcs_post_config(struct phylink_pcs *pcs,
 }
 
 static void mv88e639x_sgmii_pcs_get_state(struct phylink_pcs *pcs,
+					  unsigned int neg_mode,
 					  struct phylink_link_state *state)
 {
 	struct mv88e639x_pcs *mpcs = sgmii_pcs_to_mv88e639x_pcs(pcs);
@@ -395,6 +396,7 @@ static void mv88e639x_xg_pcs_disable(struct mv88e639x_pcs *mpcs)
 }
 
 static void mv88e639x_xg_pcs_get_state(struct phylink_pcs *pcs,
+				       unsigned int neg_mode,
 				       struct phylink_link_state *state)
 {
 	struct mv88e639x_pcs *mpcs = xg_pcs_to_mv88e639x_pcs(pcs);
@@ -889,14 +891,15 @@ static int mv88e6393x_xg_pcs_post_config(struct phylink_pcs *pcs,
 }
 
 static void mv88e6393x_xg_pcs_get_state(struct phylink_pcs *pcs,
+					unsigned int neg_mode,
 					struct phylink_link_state *state)
 {
 	struct mv88e639x_pcs *mpcs = xg_pcs_to_mv88e639x_pcs(pcs);
 	u16 status, lp_status;
 	int err;
 
 	if (state->interface != PHY_INTERFACE_MODE_USXGMII)
-		return mv88e639x_xg_pcs_get_state(pcs, state);
+		return mv88e639x_xg_pcs_get_state(pcs, neg_mode, state);
 
 	state->link = false;
 

drivers/net/dsa/qca/qca8k-8xxx.c

@@ -1491,7 +1491,7 @@ static struct qca8k_pcs *pcs_to_qca8k_pcs(struct phylink_pcs *pcs)
 	return container_of(pcs, struct qca8k_pcs, pcs);
 }
 
-static void qca8k_pcs_get_state(struct phylink_pcs *pcs,
+static void qca8k_pcs_get_state(struct phylink_pcs *pcs, unsigned int neg_mode,
 				struct phylink_link_state *state)
 {
 	struct qca8k_priv *priv = pcs_to_qca8k_pcs(pcs)->priv;

drivers/net/ethernet/cadence/macb_main.c

@@ -568,6 +568,7 @@ static void macb_usx_pcs_link_up(struct phylink_pcs *pcs, unsigned int neg_mode,
 }
 
 static void macb_usx_pcs_get_state(struct phylink_pcs *pcs,
+				   unsigned int neg_mode,
 				   struct phylink_link_state *state)
 {
 	struct macb *bp = container_of(pcs, struct macb, phylink_usx_pcs);
@@ -598,7 +599,7 @@ static int macb_usx_pcs_config(struct phylink_pcs *pcs,
 	return 0;
 }
 
-static void macb_pcs_get_state(struct phylink_pcs *pcs,
+static void macb_pcs_get_state(struct phylink_pcs *pcs, unsigned int neg_mode,
 			       struct phylink_link_state *state)
 {
 	state->link = 0;

drivers/net/ethernet/freescale/fman/fman_dtsec.c

@@ -755,12 +755,12 @@ static struct fman_mac *pcs_to_dtsec(struct phylink_pcs *pcs)
 	return container_of(pcs, struct fman_mac, pcs);
 }
 
-static void dtsec_pcs_get_state(struct phylink_pcs *pcs,
+static void dtsec_pcs_get_state(struct phylink_pcs *pcs, unsigned int neg_mode,
 				struct phylink_link_state *state)
 {
 	struct fman_mac *dtsec = pcs_to_dtsec(pcs);
 
-	phylink_mii_c22_pcs_get_state(dtsec->tbidev, state);
+	phylink_mii_c22_pcs_get_state(dtsec->tbidev, neg_mode, state);
 }
 
 static int dtsec_pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode,

drivers/net/ethernet/marvell/mvneta.c

@@ -3983,7 +3983,7 @@ static unsigned int mvneta_pcs_inband_caps(struct phylink_pcs *pcs,
 	return LINK_INBAND_DISABLE;
 }
 
-static void mvneta_pcs_get_state(struct phylink_pcs *pcs,
+static void mvneta_pcs_get_state(struct phylink_pcs *pcs, unsigned int neg_mode,
 				 struct phylink_link_state *state)
 {
 	struct mvneta_port *pp = mvneta_pcs_to_port(pcs);

drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c

@@ -6188,6 +6188,7 @@ static struct mvpp2_port *mvpp2_pcs_gmac_to_port(struct phylink_pcs *pcs)
 }
 
 static void mvpp2_xlg_pcs_get_state(struct phylink_pcs *pcs,
+				    unsigned int neg_mode,
 				    struct phylink_link_state *state)
 {
 	struct mvpp2_port *port = mvpp2_pcs_xlg_to_port(pcs);
@@ -6247,6 +6248,7 @@ static unsigned int mvpp2_gmac_pcs_inband_caps(struct phylink_pcs *pcs,
 }
 
 static void mvpp2_gmac_pcs_get_state(struct phylink_pcs *pcs,
+				     unsigned int neg_mode,
 				     struct phylink_link_state *state)
 {
 	struct mvpp2_port *port = mvpp2_pcs_gmac_to_port(pcs);