[U-Boot] [RFC PATCH 1/3] expose eth_is_active() function to test network device state

[Bernhard Nortmann]

The previous eth_device struct returned by eth_get_dev() allowed
code to directly query the state member field. However, with
CONFIG_DM_ETH this data gets encapsulated (i.e. private), and
eth_get_dev() returns a udevice struct 'abstraction' instead.

This breaks legacy code relying on the former behaviour - e.g.
netconsole.
(see http://lists.denx.de/pipermail/u-boot/2015-June/216528.html)

The patch introduces a method to retrieve the ethernet device
state in a 'clean' and uniform way, supporting both legacy code
and driver model. The new function eth_is_active() accepts a
device struct pointer and tests it for ETH_STATE_ACTIVE.

Signed-off-by: Bernhard Nortmann <bernhard.nortmann at web.de>
---

 include/net.h |  6 ++++++
 net/eth.c     | 18 +++++++++++++++++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/include/net.h b/include/net.h
index d09bec9..c135ec4 100644
--- a/include/net.h
+++ b/include/net.h
@@ -149,7 +149,13 @@ struct udevice *eth_get_dev(void); /* get the current device */
  */
 struct udevice *eth_get_dev_by_name(const char *devname);
 unsigned char *eth_get_ethaddr(void); /* get the current device MAC */
+
 /* Used only when NetConsole is enabled */
+# ifdef CONFIG_DM_ETH
+int eth_is_active(struct udevice *dev); /* Test device for active state */
+# else
+int eth_is_active(struct eth_device *dev); /* Test device for active state */
+# endif
 int eth_init_state_only(void); /* Set active state */
 void eth_halt_state_only(void); /* Set passive state */
 #endif
diff --git a/net/eth.c b/net/eth.c
index d3ec8d6..d3ff7c6 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -386,6 +386,17 @@ void eth_halt(void)
 	priv->state = ETH_STATE_PASSIVE;
 }
 
+int eth_is_active(struct udevice *dev)
+{
+	struct eth_device_priv *priv;
+
+	if (!dev || !device_active(dev))
+		return 0;
+
+	priv = dev->uclass_priv;
+	return priv->state == ETH_STATE_ACTIVE;
+}
+
 int eth_send(void *packet, int length)
 {
 	struct udevice *current;
@@ -577,7 +588,7 @@ UCLASS_DRIVER(eth) = {
 	.per_device_auto_alloc_size = sizeof(struct eth_device_priv),
 	.flags		= DM_UC_FLAG_SEQ_ALIAS,
 };
-#endif
+#endif /* #ifdef CONFIG_DM_ETH */
 
 #ifndef CONFIG_DM_ETH
 
@@ -915,6 +926,11 @@ void eth_halt(void)
 	eth_current->state = ETH_STATE_PASSIVE;
 }
 
+int eth_is_active(struct eth_device *dev)
+{
+	return dev && dev->state == ETH_STATE_ACTIVE;
+}
+
 int eth_send(void *packet, int length)
 {
 	if (!eth_current)
-- 
2.4.6