net: ethernet: ti: cpsw: resolve build deps of cpsw drivers

A following patches introduce new CPSW switchdev driver which uses common
code with legacy CPSW driver. This will introduce build dependency between
CPSW switchdev and CPSW legacy drivers related to for_each_slave() and
cpsw_slave_index() - they can be compiled both, but only one of them will
be not functional depending in Kconfig settings due to duffrences in Slave
Ports indexes calculation.

To fix this make for_each_slave() local (it's used now only by legacy CPSW
driver) and convert cpsw_slave_index() to be a function pointer which is
assigned in probe. Driver to probe is defined by DT.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpsw.c

@@ -87,6 +87,17 @@ MODULE_PARM_DESC(descs_pool_size, "Number of CPDMA CPPI descriptors in pool");
 #define CPSW_XDP_CONSUMED		1
 #define CPSW_XDP_PASS			0
 
+static int cpsw_slave_index_priv(struct cpsw_common *cpsw,
+				 struct cpsw_priv *priv)
+{
+	return cpsw->data.dual_emac ? priv->emac_port : cpsw->data.active_slave;
+}
+
+static int cpsw_get_slave_port(u32 slave_num)
+{
+	return slave_num + 1;
+}
+
 static int cpsw_ndo_vlan_rx_add_vid(struct net_device *ndev,
 				    __be16 proto, u16 vid);
 
@@ -2774,6 +2785,8 @@ static int cpsw_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	platform_set_drvdata(pdev, cpsw);
+	cpsw_slave_index = cpsw_slave_index_priv;
+
 	cpsw->dev = dev;
 
 	mode = devm_gpiod_get_array_optional(dev, "mode", GPIOD_OUT_LOW);

drivers/net/ethernet/ti/cpsw_priv.c

@@ -19,6 +19,8 @@
 #include "cpsw_sl.h"
 #include "davinci_cpdma.h"
 
+int (*cpsw_slave_index)(struct cpsw_common *cpsw, struct cpsw_priv *priv);
+
 int cpsw_init_common(struct cpsw_common *cpsw, void __iomem *ss_regs,
 		     int ale_ageout, phys_addr_t desc_mem_phys,
 		     int descs_pool_size)

drivers/net/ethernet/ti/cpsw_priv.h

@@ -373,14 +373,8 @@ struct cpsw_priv {
 #define ndev_to_cpsw(ndev) (((struct cpsw_priv *)netdev_priv(ndev))->cpsw)
 #define napi_to_cpsw(napi)	container_of(napi, struct cpsw_common, napi)
 
-#define cpsw_slave_index(cpsw, priv)				\
-		((cpsw->data.dual_emac) ? priv->emac_port :	\
-		cpsw->data.active_slave)
-
-static inline int cpsw_get_slave_port(u32 slave_num)
-{
-	return slave_num + 1;
-}
+extern int (*cpsw_slave_index)(struct cpsw_common *cpsw,
+			       struct cpsw_priv *priv);
 
 struct addr_sync_ctx {
 	struct net_device *ndev;