[PATCH CFT net-next 0/6] net: stmmac/xpcs: modernise PCS support

Hi,

This series updates xpcs and stmmac for the recent changes to phylink
to better support split PCS and to get rid of private MAC validation
functions.

This series is slightly more involved than other conversions as stmmac
has already had optional proper split PCS support.

The patches:

1) Provide a function to query the xpcs for the interface modes that
   are supported.

2) Populates the MAC capabilities and switches stmmac_validate() to use
   phylink_get_linkmodes(). We do not use phylink_generic_validate() yet
   as (a) we do not always have the supported interfaces populated, and
   (b) the existing code does not restrict based on interface. There
   should be no functional effect from this patch.

3) Populates phylink's supported interfaces from the xpcs when the xpcs
   is configured by firmware and also the firmware configured interface
   mode. Note: this will restrict stmmac to only supporting these
   interfaces modes - stmmac maintainers need to verify that this
   behaviour is acceptable.

4) stmmac_validate() tail-calls xpcs_validate(), but we don't need it to
   now that PCS have their own validation method. Convert stmmac and
   xpcs to use this method instead.

5) xpcs sets the poll field of phylink_pcs to true, meaning xpcs
   requires its status to be polled. There is no need to also set the
   phylink_config.pcs_poll. Remove this.

6) Switch to phylink_generic_validate(). This is probably the most
   contravertial change in this patch set as this will cause the MAC to
   restrict link modes based on the interface mode. From an inspection
   of the xpcs driver, this should be safe, as XPCS only further
   restricts the link modes to a subset of these (whether that is
   correct or not is not an issue I am addressing here.) For
   implementations that do not use xpcs, this is a more open question
   and needs feedback from stmmac maintainers.

Please review and test this series. Thanks!

 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 144 ++++++----------------
 drivers/net/pcs/pcs-xpcs.c                        |  41 +++---
 include/linux/pcs/pcs-xpcs.h                      |   3 +-
 3 files changed, 67 insertions(+), 121 deletions(-)

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

Add a function to the xpcs driver to retrieve the supported PHY
interface modes, which can be used by drivers to fill in phylink's
supported_interfaces mask.

We validate the interface bit index to ensure that it fits within the
bitmap as xpcs lists PHY_INTERFACE_MODE_MAX in an entry.

Signed-off-by: Russell King (Oracle) <redacted>
---
 drivers/net/pcs/pcs-xpcs.c   | 14 ++++++++++++++
 include/linux/pcs/pcs-xpcs.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index cd6742e6ba8b..f45821524fab 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c

@@ -662,6 +662,20 @@ void xpcs_validate(struct dw_xpcs *xpcs, unsigned long *supported,
 }
 EXPORT_SYMBOL_GPL(xpcs_validate);
 
+void xpcs_get_interfaces(struct dw_xpcs *xpcs, unsigned long *interfaces)
+{
+	int i, j;
+
+	for (i = 0; i < DW_XPCS_INTERFACE_MAX; i++) {
+		const struct xpcs_compat *compat = &xpcs->id->compat[i];
+
+		for (j = 0; j < compat->num_interfaces; j++)
+			if (compat->interface[j] < PHY_INTERFACE_MODE_MAX)
+				__set_bit(compat->interface[j], interfaces);
+	}
+}
+EXPORT_SYMBOL_GPL(xpcs_get_interfaces);
+
 int xpcs_config_eee(struct dw_xpcs *xpcs, int mult_fact_100ns, int enable)
 {
 	int ret;

diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index add077a81b21..3126a4924d92 100644
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h

@@ -33,6 +33,7 @@ int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
 		   unsigned int mode);
 void xpcs_validate(struct dw_xpcs *xpcs, unsigned long *supported,
 		   struct phylink_link_state *state);
+void xpcs_get_interfaces(struct dw_xpcs *xpcs, unsigned long *interfaces);
 int xpcs_config_eee(struct dw_xpcs *xpcs, int mult_fact_100ns,
 		    int enable);
 struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev,

-- 
2.30.2

Add the MAC speed, duplex and pause capabilities to the phylink_config
structure, and switch stmmac_validate() to use phylink_get_linkmodes()
to generate the mask of supported ethtool link modes.

Signed-off-by: Russell King (Oracle) <redacted>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 125 ++++++------------
 1 file changed, 42 insertions(+), 83 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c26ac288f981..09bef8310360 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -942,95 +942,22 @@ static void stmmac_validate(struct phylink_config *config,
 {
 	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
 	__ETHTOOL_DECLARE_LINK_MODE_MASK(mac_supported) = { 0, };
-	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
-	int tx_cnt = priv->plat->tx_queues_to_use;
-	int max_speed = priv->plat->max_speed;
-
-	phylink_set(mac_supported, 10baseT_Half);
-	phylink_set(mac_supported, 10baseT_Full);
-	phylink_set(mac_supported, 100baseT_Half);
-	phylink_set(mac_supported, 100baseT_Full);
-	phylink_set(mac_supported, 1000baseT_Half);
-	phylink_set(mac_supported, 1000baseT_Full);
-	phylink_set(mac_supported, 1000baseKX_Full);
 
+	/* This is very similar to phylink_generic_validate() except that
+	 * we always use PHY_INTERFACE_MODE_INTERNAL to get all capabilities.
+	 * This is because we don't always have config->supported_interfaces
+	 * populated (only when we have the XPCS.)
+	 *
+	 * When we do have an XPCS, we could pass state->interface, as XPCS
+	 * limits to a subset of the ethtool link modes allowed here.
+	 */
 	phylink_set(mac_supported, Autoneg);
-	phylink_set(mac_supported, Pause);
-	phylink_set(mac_supported, Asym_Pause);
 	phylink_set_port_modes(mac_supported);
-
-	/* Cut down 1G if asked to */
-	if ((max_speed > 0) && (max_speed < 1000)) {
-		phylink_set(mask, 1000baseT_Full);
-		phylink_set(mask, 1000baseX_Full);
-	} else if (priv->plat->has_gmac4) {
-		if (!max_speed || max_speed >= 2500) {
-			phylink_set(mac_supported, 2500baseT_Full);
-			phylink_set(mac_supported, 2500baseX_Full);
-		}
-	} else if (priv->plat->has_xgmac) {
-		if (!max_speed || (max_speed >= 2500)) {
-			phylink_set(mac_supported, 2500baseT_Full);
-			phylink_set(mac_supported, 2500baseX_Full);
-		}
-		if (!max_speed || (max_speed >= 5000)) {
-			phylink_set(mac_supported, 5000baseT_Full);
-		}
-		if (!max_speed || (max_speed >= 10000)) {
-			phylink_set(mac_supported, 10000baseSR_Full);
-			phylink_set(mac_supported, 10000baseLR_Full);
-			phylink_set(mac_supported, 10000baseER_Full);
-			phylink_set(mac_supported, 10000baseLRM_Full);
-			phylink_set(mac_supported, 10000baseT_Full);
-			phylink_set(mac_supported, 10000baseKX4_Full);
-			phylink_set(mac_supported, 10000baseKR_Full);
-		}
-		if (!max_speed || (max_speed >= 25000)) {
-			phylink_set(mac_supported, 25000baseCR_Full);
-			phylink_set(mac_supported, 25000baseKR_Full);
-			phylink_set(mac_supported, 25000baseSR_Full);
-		}
-		if (!max_speed || (max_speed >= 40000)) {
-			phylink_set(mac_supported, 40000baseKR4_Full);
-			phylink_set(mac_supported, 40000baseCR4_Full);
-			phylink_set(mac_supported, 40000baseSR4_Full);
-			phylink_set(mac_supported, 40000baseLR4_Full);
-		}
-		if (!max_speed || (max_speed >= 50000)) {
-			phylink_set(mac_supported, 50000baseCR2_Full);
-			phylink_set(mac_supported, 50000baseKR2_Full);
-			phylink_set(mac_supported, 50000baseSR2_Full);
-			phylink_set(mac_supported, 50000baseKR_Full);
-			phylink_set(mac_supported, 50000baseSR_Full);
-			phylink_set(mac_supported, 50000baseCR_Full);
-			phylink_set(mac_supported, 50000baseLR_ER_FR_Full);
-			phylink_set(mac_supported, 50000baseDR_Full);
-		}
-		if (!max_speed || (max_speed >= 100000)) {
-			phylink_set(mac_supported, 100000baseKR4_Full);
-			phylink_set(mac_supported, 100000baseSR4_Full);
-			phylink_set(mac_supported, 100000baseCR4_Full);
-			phylink_set(mac_supported, 100000baseLR4_ER4_Full);
-			phylink_set(mac_supported, 100000baseKR2_Full);
-			phylink_set(mac_supported, 100000baseSR2_Full);
-			phylink_set(mac_supported, 100000baseCR2_Full);
-			phylink_set(mac_supported, 100000baseLR2_ER2_FR2_Full);
-			phylink_set(mac_supported, 100000baseDR2_Full);
-		}
-	}
-
-	/* Half-Duplex can only work with single queue */
-	if (tx_cnt > 1) {
-		phylink_set(mask, 10baseT_Half);
-		phylink_set(mask, 100baseT_Half);
-		phylink_set(mask, 1000baseT_Half);
-	}
+	phylink_get_linkmodes(mac_supported, PHY_INTERFACE_MODE_INTERNAL,
+			      config->mac_capabilities);
 
 	linkmode_and(supported, supported, mac_supported);
-	linkmode_andnot(supported, supported, mask);
-
 	linkmode_and(state->advertising, state->advertising, mac_supported);
-	linkmode_andnot(state->advertising, state->advertising, mask);
 
 	/* If PCS is supported, check which modes it supports. */
 	if (priv->hw->xpcs)

@@ -1253,6 +1180,7 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
 {
 	struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
 	struct fwnode_handle *fwnode = of_fwnode_handle(priv->plat->phylink_node);
+	int max_speed = priv->plat->max_speed;
 	int mode = priv->plat->phy_interface;
 	struct phylink *phylink;
 

@@ -1266,6 +1194,37 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
 	if (!fwnode)
 		fwnode = dev_fwnode(priv->device);
 
+	priv->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
+		MAC_10 | MAC_100;
+
+	if (!max_speed || max_speed >= 1000)
+		priv->phylink_config.mac_capabilities |= MAC_1000;
+
+	if (priv->plat->has_gmac4) {
+		if (!max_speed || max_speed >= 2500)
+			priv->phylink_config.mac_capabilities |= MAC_2500FD;
+	} else if (priv->plat->has_xgmac) {
+		if (!max_speed || max_speed >= 2500)
+			priv->phylink_config.mac_capabilities |= MAC_2500FD;
+		if (!max_speed || max_speed >= 5000)
+			priv->phylink_config.mac_capabilities |= MAC_5000FD;
+		if (!max_speed || max_speed >= 10000)
+			priv->phylink_config.mac_capabilities |= MAC_10000FD;
+		if (!max_speed || max_speed >= 25000)
+			priv->phylink_config.mac_capabilities |= MAC_25000FD;
+		if (!max_speed || max_speed >= 40000)
+			priv->phylink_config.mac_capabilities |= MAC_40000FD;
+		if (!max_speed || max_speed >= 50000)
+			priv->phylink_config.mac_capabilities |= MAC_50000FD;
+		if (!max_speed || max_speed >= 100000)
+			priv->phylink_config.mac_capabilities |= MAC_100000FD;
+	}
+
+	/* Half-Duplex can only work with single queue */
+	if (priv->plat->tx_queues_to_use > 1)
+		priv->phylink_config.mac_capabilities &=
+			~(MAC_10HD | MAC_100HD | MAC_1000HD);
+
 	phylink = phylink_create(&priv->phylink_config, fwnode,
 				 mode, &stmmac_phylink_mac_ops);
 	if (IS_ERR(phylink))

-- 
2.30.2

Fill in phylink's supported_interfaces bitmap with the PHY interface
modes which can be used to talk to the PHY.

We indicate that the PHY interface mode passed in platform data is
always supported, as this is the initial mode passed into phylink.
When there is no PCS specified, we assume that this is the only mode
that is supported - indeed, the driver appears not to support dynamic
switching of interface types at present.

When a xpcs is present, it defines the PHY interface modes that the
stmmac driver can support. Request the supported interfaces from the
xpcs driver, and pass them to phylink.

Signed-off-by: Russell King (Oracle) <redacted>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 09bef8310360..b8ec8afb95a6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -1194,6 +1194,14 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
 	if (!fwnode)
 		fwnode = dev_fwnode(priv->device);
 
+	/* Set the platform/firmware specified interface mode */
+	__set_bit(mode, priv->phylink_config.supported_interfaces);
+
+	/* If we have an xpcs, it defines which PHY interfaces are supported. */
+	if (priv->hw->xpcs)
+		xpcs_get_interfaces(priv->hw->xpcs,
+				    priv->phylink_config.supported_interfaces);
+
 	priv->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
 		MAC_10 | MAC_100;
 

-- 
2.30.2

stmmac explicitly calls the xpcs driver to validate the ethtool
linkmodes. This is no longer necessary as phylink now supports
validation through a PCS method. Convert both drivers to use this
new mechanism.

Signed-off-by: Russell King (Oracle) <redacted>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c |  4 ---
 drivers/net/pcs/pcs-xpcs.c                    | 27 ++++++++-----------
 include/linux/pcs/pcs-xpcs.h                  |  2 --
 3 files changed, 11 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index b8ec8afb95a6..6f35ea30823c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -958,10 +958,6 @@ static void stmmac_validate(struct phylink_config *config,
 
 	linkmode_and(supported, supported, mac_supported);
 	linkmode_and(state->advertising, state->advertising, mac_supported);
-
-	/* If PCS is supported, check which modes it supports. */
-	if (priv->hw->xpcs)
-		xpcs_validate(priv->hw->xpcs, supported, state);
 }
 
 static void stmmac_mac_config(struct phylink_config *config, unsigned int mode,

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index f45821524fab..61418d4dc0cd 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c

@@ -632,35 +632,29 @@ static void xpcs_resolve_pma(struct dw_xpcs *xpcs,
 	}
 }
 
-void xpcs_validate(struct dw_xpcs *xpcs, unsigned long *supported,
-		   struct phylink_link_state *state)
+static int xpcs_validate(struct phylink_pcs *pcs, unsigned long *supported,
+			 const struct phylink_link_state *state)
 {
-	__ETHTOOL_DECLARE_LINK_MODE_MASK(xpcs_supported);
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(xpcs_supported) = { 0, };
 	const struct xpcs_compat *compat;
+	struct dw_xpcs *xpcs;
 	int i;
 
-	/* phylink expects us to report all supported modes with
-	 * PHY_INTERFACE_MODE_NA, just don't limit the supported and
-	 * advertising masks and exit.
-	 */
-	if (state->interface == PHY_INTERFACE_MODE_NA)
-		return;
-
-	linkmode_zero(xpcs_supported);
-
+	xpcs = phylink_pcs_to_xpcs(pcs);
 	compat = xpcs_find_compat(xpcs->id, state->interface);
 
-	/* Populate the supported link modes for this
-	 * PHY interface type
+	/* Populate the supported link modes for this PHY interface type.
+	 * FIXME: what about the port modes and autoneg bit? This masks
+	 * all those away.
 	 */
 	if (compat)
 		for (i = 0; compat->supported[i] != __ETHTOOL_LINK_MODE_MASK_NBITS; i++)
 			set_bit(compat->supported[i], xpcs_supported);
 
 	linkmode_and(supported, supported, xpcs_supported);
-	linkmode_and(state->advertising, state->advertising, xpcs_supported);
+
+	return 0;
 }
-EXPORT_SYMBOL_GPL(xpcs_validate);
 
 void xpcs_get_interfaces(struct dw_xpcs *xpcs, unsigned long *interfaces)
 {

@@ -1120,6 +1114,7 @@ static const struct xpcs_id xpcs_id_list[] = {
 };
 
 static const struct phylink_pcs_ops xpcs_phylink_ops = {
+	.pcs_validate = xpcs_validate,
 	.pcs_config = xpcs_config,
 	.pcs_get_state = xpcs_get_state,
 	.pcs_link_up = xpcs_link_up,

diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index 3126a4924d92..266eb26fb029 100644
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h

@@ -31,8 +31,6 @@ void xpcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
 		  phy_interface_t interface, int speed, int duplex);
 int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
 		   unsigned int mode);
-void xpcs_validate(struct dw_xpcs *xpcs, unsigned long *supported,
-		   struct phylink_link_state *state);
 void xpcs_get_interfaces(struct dw_xpcs *xpcs, unsigned long *interfaces);
 int xpcs_config_eee(struct dw_xpcs *xpcs, int mult_fact_100ns,
 		    int enable);

-- 
2.30.2

Phylink will use PCS polling whenever the PCS's poll member is set, so
setting phylink_config.pcs_poll as well is redundant.

Signed-off-by: Russell King (Oracle) <redacted>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 6f35ea30823c..94f7282da006 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -1182,7 +1182,6 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
 
 	priv->phylink_config.dev = &priv->dev->dev;
 	priv->phylink_config.type = PHYLINK_NETDEV;
-	priv->phylink_config.pcs_poll = true;
 	if (priv->plat->mdio_bus_data)
 		priv->phylink_config.ovr_an_inband =
 			mdio_bus_data->xpcs_an_inband;

-- 
2.30.2

Convert stmmac to use phylink_generic_validate() now that we have the
MAC capabilities and supported interfaces filled in, and we have the
PCS validation handled via the PCS operations.

Signed-off-by: Russell King (Oracle) <redacted>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 26 +------------------
 1 file changed, 1 insertion(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 94f7282da006..ce3d9a789cef 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -936,30 +936,6 @@ static void stmmac_mac_flow_ctrl(struct stmmac_priv *priv, u32 duplex)
 			priv->pause, tx_cnt);
 }
 
-static void stmmac_validate(struct phylink_config *config,
-			    unsigned long *supported,
-			    struct phylink_link_state *state)
-{
-	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
-	__ETHTOOL_DECLARE_LINK_MODE_MASK(mac_supported) = { 0, };
-
-	/* This is very similar to phylink_generic_validate() except that
-	 * we always use PHY_INTERFACE_MODE_INTERNAL to get all capabilities.
-	 * This is because we don't always have config->supported_interfaces
-	 * populated (only when we have the XPCS.)
-	 *
-	 * When we do have an XPCS, we could pass state->interface, as XPCS
-	 * limits to a subset of the ethtool link modes allowed here.
-	 */
-	phylink_set(mac_supported, Autoneg);
-	phylink_set_port_modes(mac_supported);
-	phylink_get_linkmodes(mac_supported, PHY_INTERFACE_MODE_INTERNAL,
-			      config->mac_capabilities);
-
-	linkmode_and(supported, supported, mac_supported);
-	linkmode_and(state->advertising, state->advertising, mac_supported);
-}
-
 static void stmmac_mac_config(struct phylink_config *config, unsigned int mode,
 			      const struct phylink_link_state *state)
 {

@@ -1096,7 +1072,7 @@ static void stmmac_mac_link_up(struct phylink_config *config,
 }
 
 static const struct phylink_mac_ops stmmac_phylink_mac_ops = {
-	.validate = stmmac_validate,
+	.validate = phylink_generic_validate,
 	.mac_config = stmmac_mac_config,
 	.mac_link_down = stmmac_mac_link_down,
 	.mac_link_up = stmmac_mac_link_up,

-- 
2.30.2

On Thu, Dec 16, 2021 at 01:11:40PM +0000, Russell King (Oracle) wrote:

Hi,

This series updates xpcs and stmmac for the recent changes to phylink
to better support split PCS and to get rid of private MAC validation
functions.

This series is slightly more involved than other conversions as stmmac
has already had optional proper split PCS support.

The patches:

1) Provide a function to query the xpcs for the interface modes that
   are supported.

2) Populates the MAC capabilities and switches stmmac_validate() to use
   phylink_get_linkmodes(). We do not use phylink_generic_validate() yet
   as (a) we do not always have the supported interfaces populated, and
   (b) the existing code does not restrict based on interface. There
   should be no functional effect from this patch.

3) Populates phylink's supported interfaces from the xpcs when the xpcs
   is configured by firmware and also the firmware configured interface
   mode. Note: this will restrict stmmac to only supporting these
   interfaces modes - stmmac maintainers need to verify that this
   behaviour is acceptable.

4) stmmac_validate() tail-calls xpcs_validate(), but we don't need it to
   now that PCS have their own validation method. Convert stmmac and
   xpcs to use this method instead.

5) xpcs sets the poll field of phylink_pcs to true, meaning xpcs
   requires its status to be polled. There is no need to also set the
   phylink_config.pcs_poll. Remove this.

6) Switch to phylink_generic_validate(). This is probably the most
   contravertial change in this patch set as this will cause the MAC to
   restrict link modes based on the interface mode. From an inspection
   of the xpcs driver, this should be safe, as XPCS only further
   restricts the link modes to a subset of these (whether that is
   correct or not is not an issue I am addressing here.) For
   implementations that do not use xpcs, this is a more open question
   and needs feedback from stmmac maintainers.

Please review and test this series. Thanks!

Tested this patch series on my Intel Elkhart Lake setup with Marvell
88E1510 PHY. 

Everything works perfectly!

 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 144 ++++++----------------
 drivers/net/pcs/pcs-xpcs.c                        |  41 +++---
 include/linux/pcs/pcs-xpcs.h                      |   3 +-
 3 files changed, 67 insertions(+), 121 deletions(-)

On Fri, Dec 17, 2021 at 01:57:29PM +0800, Wong Vee Khee wrote:

On Thu, Dec 16, 2021 at 01:11:40PM +0000, Russell King (Oracle) wrote:

quoted

Hi,

This series updates xpcs and stmmac for the recent changes to phylink
to better support split PCS and to get rid of private MAC validation
functions.

This series is slightly more involved than other conversions as stmmac
has already had optional proper split PCS support.

The patches:

1) Provide a function to query the xpcs for the interface modes that
   are supported.

2) Populates the MAC capabilities and switches stmmac_validate() to use
   phylink_get_linkmodes(). We do not use phylink_generic_validate() yet
   as (a) we do not always have the supported interfaces populated, and
   (b) the existing code does not restrict based on interface. There
   should be no functional effect from this patch.

3) Populates phylink's supported interfaces from the xpcs when the xpcs
   is configured by firmware and also the firmware configured interface
   mode. Note: this will restrict stmmac to only supporting these
   interfaces modes - stmmac maintainers need to verify that this
   behaviour is acceptable.

4) stmmac_validate() tail-calls xpcs_validate(), but we don't need it to
   now that PCS have their own validation method. Convert stmmac and
   xpcs to use this method instead.

5) xpcs sets the poll field of phylink_pcs to true, meaning xpcs
   requires its status to be polled. There is no need to also set the
   phylink_config.pcs_poll. Remove this.

6) Switch to phylink_generic_validate(). This is probably the most
   contravertial change in this patch set as this will cause the MAC to
   restrict link modes based on the interface mode. From an inspection
   of the xpcs driver, this should be safe, as XPCS only further
   restricts the link modes to a subset of these (whether that is
   correct or not is not an issue I am addressing here.) For
   implementations that do not use xpcs, this is a more open question
   and needs feedback from stmmac maintainers.

Please review and test this series. Thanks!

Tested this patch series on my Intel Elkhart Lake setup with Marvell
88E1510 PHY. 

Everything works perfectly!

Can I take that as a tested-by please?

It would be good to get some feedback from other stmmac users, since I
believe stmmac is used in multiple different configurations.

Thanks!

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

On Fri, Jan 07, 2022 at 01:40:06PM +0000, Russell King (Oracle) wrote:

On Fri, Dec 17, 2021 at 01:57:29PM +0800, Wong Vee Khee wrote:

quoted

On Thu, Dec 16, 2021 at 01:11:40PM +0000, Russell King (Oracle) wrote:

quoted

Hi,

This series updates xpcs and stmmac for the recent changes to phylink
to better support split PCS and to get rid of private MAC validation
functions.

This series is slightly more involved than other conversions as stmmac
has already had optional proper split PCS support.

The patches:

1) Provide a function to query the xpcs for the interface modes that
   are supported.

2) Populates the MAC capabilities and switches stmmac_validate() to use
   phylink_get_linkmodes(). We do not use phylink_generic_validate() yet
   as (a) we do not always have the supported interfaces populated, and
   (b) the existing code does not restrict based on interface. There
   should be no functional effect from this patch.

3) Populates phylink's supported interfaces from the xpcs when the xpcs
   is configured by firmware and also the firmware configured interface
   mode. Note: this will restrict stmmac to only supporting these
   interfaces modes - stmmac maintainers need to verify that this
   behaviour is acceptable.

4) stmmac_validate() tail-calls xpcs_validate(), but we don't need it to
   now that PCS have their own validation method. Convert stmmac and
   xpcs to use this method instead.

5) xpcs sets the poll field of phylink_pcs to true, meaning xpcs
   requires its status to be polled. There is no need to also set the
   phylink_config.pcs_poll. Remove this.

6) Switch to phylink_generic_validate(). This is probably the most
   contravertial change in this patch set as this will cause the MAC to
   restrict link modes based on the interface mode. From an inspection
   of the xpcs driver, this should be safe, as XPCS only further
   restricts the link modes to a subset of these (whether that is
   correct or not is not an issue I am addressing here.) For
   implementations that do not use xpcs, this is a more open question
   and needs feedback from stmmac maintainers.

Please review and test this series. Thanks!

Tested this patch series on my Intel Elkhart Lake setup with Marvell
88E1510 PHY. 

Everything works perfectly!

Can I take that as a tested-by please?

Sure.

Tested-by: Wong Vee Khee <redacted> # Intel EHL

It would be good to get some feedback from other stmmac users, since I
believe stmmac is used in multiple different configurations.

Thanks!

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!