Merge branch 'cpsw-delete-rx_descs'

Ivan Khoronzhuk says:

====================
net: ethernet: ti: cpsw: delete rx_descs property

There is no reason in rx_descs property because davinici_cpdma
driver splits pool of descriptors equally between tx and rx channels.
So, this patch series makes driver to use available number of
descriptors for rx channels.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/cpsw.txt

@@ -15,7 +15,6 @@ Required properties:
 - cpdma_channels 	: Specifies number of channels in CPDMA
 - ale_entries		: Specifies No of entries ALE can hold
 - bd_ram_size		: Specifies internal descriptor RAM size
-- rx_descs		: Specifies number of Rx descriptors
 - mac_control		: Specifies Default MAC control register content
 			  for the specific platform
 - slaves		: Specifies number for slaves

arch/arm/boot/dts/am33xx.dtsi

@@ -766,7 +766,6 @@
 			ale_entries = <1024>;
 			bd_ram_size = <0x2000>;
 			no_bd_ram = <0>;
-			rx_descs = <64>;
 			mac_control = <0x20>;
 			slaves = <2>;
 			active_slave = <0>;

arch/arm/boot/dts/am4372.dtsi

@@ -626,7 +626,6 @@
 			ale_entries = <1024>;
 			bd_ram_size = <0x2000>;
 			no_bd_ram = <0>;
-			rx_descs = <64>;
 			mac_control = <0x20>;
 			slaves = <2>;
 			active_slave = <0>;

arch/arm/boot/dts/dm814x.dtsi

@@ -509,7 +509,6 @@
 			ale_entries = <1024>;
 			bd_ram_size = <0x2000>;
 			no_bd_ram = <0>;
-			rx_descs = <64>;
 			mac_control = <0x20>;
 			slaves = <2>;
 			active_slave = <0>;

arch/arm/boot/dts/dra7.dtsi

@@ -1626,7 +1626,6 @@
 			ale_entries = <1024>;
 			bd_ram_size = <0x2000>;
 			no_bd_ram = <0>;
-			rx_descs = <64>;
 			mac_control = <0x20>;
 			slaves = <2>;
 			active_slave = <0>;

drivers/net/ethernet/ti/cpsw.c

@@ -1277,6 +1277,7 @@ static int cpsw_ndo_open(struct net_device *ndev)
 
 	if (!cpsw_common_res_usage_state(priv)) {
 		struct cpsw_priv *priv_sl0 = cpsw_get_slave_priv(priv, 0);
+		int buf_num;
 
 		/* setup tx dma to fixed prio and zero offset */
 		cpdma_control_set(priv->dma, CPDMA_TX_PRIO_FIXED, 1);
@@ -1304,10 +1305,8 @@ static int cpsw_ndo_open(struct net_device *ndev)
 			enable_irq(priv->irqs_table[0]);
 		}
 
-		if (WARN_ON(!priv->data.rx_descs))
-			priv->data.rx_descs = 128;
-
-		for (i = 0; i < priv->data.rx_descs; i++) {
+		buf_num = cpdma_chan_get_rx_buf_num(priv->dma);
+		for (i = 0; i < buf_num; i++) {
 			struct sk_buff *skb;
 
 			ret = -ENOMEM;
@@ -1998,12 +1997,6 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data,
 	}
 	data->bd_ram_size = prop;
 
-	if (of_property_read_u32(node, "rx_descs", &prop)) {
-		dev_err(&pdev->dev, "Missing rx_descs property in the DT.\n");
-		return -EINVAL;
-	}
-	data->rx_descs = prop;
-
 	if (of_property_read_u32(node, "mac_control", &prop)) {
 		dev_err(&pdev->dev, "Missing mac_control property in the DT.\n");
 		return -EINVAL;

drivers/net/ethernet/ti/cpsw.h

@@ -35,7 +35,6 @@ struct cpsw_platform_data {
 	u32	cpts_clock_shift; /* convert input clock ticks to nanoseconds */
 	u32	ale_entries;	/* ale table size */
 	u32	bd_ram_size;  /*buffer descriptor ram size */
-	u32	rx_descs;	/* Number of Rx Descriptios */
 	u32	mac_control;	/* Mac control register */
 	u16	default_vlan;	/* Def VLAN for ALE lookup in VLAN aware mode*/
 	bool	dual_emac;	/* Enable Dual EMAC mode */

drivers/net/ethernet/ti/davinci_cpdma.c

@@ -543,6 +543,12 @@ struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
 }
 EXPORT_SYMBOL_GPL(cpdma_chan_create);
 
+int cpdma_chan_get_rx_buf_num(struct cpdma_ctlr *ctlr)
+{
+	return ctlr->pool->num_desc / 2;
+}
+EXPORT_SYMBOL_GPL(cpdma_chan_get_rx_buf_num);
+
 int cpdma_chan_destroy(struct cpdma_chan *chan)
 {
 	struct cpdma_ctlr *ctlr;

drivers/net/ethernet/ti/davinci_cpdma.h

@@ -81,6 +81,7 @@ int cpdma_ctlr_dump(struct cpdma_ctlr *ctlr);
 
 struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
 				     cpdma_handler_fn handler);
+int cpdma_chan_get_rx_buf_num(struct cpdma_ctlr *ctlr);
 int cpdma_chan_destroy(struct cpdma_chan *chan);
 int cpdma_chan_start(struct cpdma_chan *chan);
 int cpdma_chan_stop(struct cpdma_chan *chan);