[U-Boot] [PATCH v2 24/45] net: mvpp2: adapt rxq distribution to PPv2.2

[Stefan Roese]

From: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>

In PPv2.1, we have a maximum of 8 RXQs per port, with a default of 4
RXQs per port, and we were assigning RXQs 0->3 to the first port, 4->7
to the second port, 8->11 to the third port, etc.

In PPv2.2, we have a maximum of 32 RXQs per port, and we must allocate
RXQs from the range of 32 RXQs available for each port. So port 0 must
use RXQs in the range 0->31, port 1 in the range 32->63, etc.

This commit adapts the mvpp2 to this difference between PPv2.1 and
PPv2.2:

- The constant definition MVPP2_MAX_RXQ is replaced by a new field
  'max_port_rxqs' in 'struct mvpp2', which stores the maximum number of
  RXQs per port. This field is initialized during ->probe() depending
  on the IP version.

- MVPP2_RXQ_TOTAL_NUM is removed, and instead we calculate the total
  number of RXQs by multiplying the number of ports by the maximum of
  RXQs per port. This was anyway used in only one place.

- In mvpp2_port_probe(), the calculation of port->first_rxq is adjusted
  to cope with the different allocation strategy between PPv2.1 and
  PPv2.2. Due to this change, the 'next_first_rxq' argument of this
  function is no longer needed and is removed.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
Signed-off-by: Stefan Roese <sr at denx.de>
---

Changes in v2: None

 drivers/net/mvpp2.c | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/drivers/net/mvpp2.c b/drivers/net/mvpp2.c
index 16a9c75cf0..c683fff53f 100644
--- a/drivers/net/mvpp2.c
+++ b/drivers/net/mvpp2.c
@@ -454,9 +454,6 @@ do {									\
 /* Maximum number of TXQs used by single port */
 #define MVPP2_MAX_TXQ			8
 
-/* Maximum number of RXQs used by single port */
-#define MVPP2_MAX_RXQ			8
-
 /* Default number of TXQs in use */
 #define MVPP2_DEFAULT_TXQ		1
 
@@ -464,9 +461,6 @@ do {									\
 #define MVPP2_DEFAULT_RXQ		1
 #define CONFIG_MV_ETH_RXQ		8	/* increment by 8 */
 
-/* Total number of RXQs available to all ports */
-#define MVPP2_RXQ_TOTAL_NUM		(MVPP2_MAX_PORTS * MVPP2_MAX_RXQ)
-
 /* Max number of Rx descriptors */
 #define MVPP2_MAX_RXD			16
 
@@ -772,6 +766,9 @@ struct mvpp2 {
 	/* HW version */
 	enum { MVPP21, MVPP22 } hw_version;
 
+	/* Maximum number of RXQs per port */
+	unsigned int max_port_rxqs;
+
 	struct mii_dev *bus;
 };
 
@@ -3700,7 +3697,8 @@ static int mvpp2_port_init(struct udevice *dev, struct mvpp2_port *port)
 	struct mvpp2_txq_pcpu *txq_pcpu;
 	int queue, cpu, err;
 
-	if (port->first_rxq + rxq_number > MVPP2_RXQ_TOTAL_NUM)
+	if (port->first_rxq + rxq_number >
+	    MVPP2_MAX_PORTS * priv->max_port_rxqs)
 		return -EINVAL;
 
 	/* Disable port */
@@ -3808,8 +3806,7 @@ static int mvpp2_port_init(struct udevice *dev, struct mvpp2_port *port)
 static int mvpp2_port_probe(struct udevice *dev,
 			    struct mvpp2_port *port,
 			    int port_node,
-			    struct mvpp2 *priv,
-			    int *next_first_rxq)
+			    struct mvpp2 *priv)
 {
 	int phy_node;
 	u32 id;
@@ -3843,7 +3840,10 @@ static int mvpp2_port_probe(struct udevice *dev,
 
 	port->priv = priv;
 	port->id = id;
-	port->first_rxq = *next_first_rxq;
+	if (priv->hw_version == MVPP21)
+		port->first_rxq = port->id * rxq_number;
+	else
+		port->first_rxq = port->id * priv->max_port_rxqs;
 	port->phy_node = phy_node;
 	port->phy_interface = phy_mode;
 	port->phyaddr = phyaddr;
@@ -3877,8 +3877,6 @@ static int mvpp2_port_probe(struct udevice *dev,
 	}
 	mvpp2_port_power_up(port);
 
-	/* Increment the first Rx queue number to be used by the next port */
-	*next_first_rxq += CONFIG_MV_ETH_RXQ;
 	priv->port_list[id] = port;
 	return 0;
 }
@@ -3995,7 +3993,8 @@ static int mvpp2_init(struct udevice *dev, struct mvpp2 *priv)
 	u32 val;
 
 	/* Checks for hardware constraints (U-Boot uses only one rxq) */
-	if ((rxq_number > MVPP2_MAX_RXQ) || (txq_number > MVPP2_MAX_TXQ)) {
+	if ((rxq_number > priv->max_port_rxqs) ||
+	    (txq_number > MVPP2_MAX_TXQ)) {
 		dev_err(&pdev->dev, "invalid queue size parameter\n");
 		return -EINVAL;
 	}
@@ -4388,8 +4387,7 @@ static int mvpp2_probe(struct udevice *dev)
 		return err;
 	}
 
-	return mvpp2_port_probe(dev, port, dev_of_offset(dev), priv,
-				&buffer_loc.first_rxq);
+	return mvpp2_port_probe(dev, port, dev_of_offset(dev), priv);
 }
 
 static const struct eth_ops mvpp2_ops = {
@@ -4477,6 +4475,11 @@ static int mvpp2_base_probe(struct udevice *dev)
 			return PTR_ERR(priv->iface_base);
 	}
 
+	if (priv->hw_version == MVPP21)
+		priv->max_port_rxqs = 8;
+	else
+		priv->max_port_rxqs = 32;
+
 	/* Finally create and register the MDIO bus driver */
 	bus = mdio_alloc();
 	if (!bus) {
-- 
2.12.1