net: Handle ethaddr changes as an env callback

When the ethaddr is changed in the env, update the device pdata at the
same time (only if it is probed for the DM case; only if registered for
the non-DM case). Again this gets us closer to completely non-polled
env needed to simplify the net_loop.

This requires that the NET feature select the REGEX feature.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

include/env_callback.h

@@ -52,7 +52,8 @@
 	"serverip:serverip," \
 	"nvlan:nvlan," \
 	"vlan:vlan," \
-	DNS_CALLBACK
+	DNS_CALLBACK \
+	"eth\\d?addr:ethaddr,"
 #else
 #define NET_CALLBACKS
 #endif

net/Kconfig

@@ -4,6 +4,7 @@
 
 menuconfig NET
 	bool "Networking support"
+	select REGEX
 
 if NET
 

net/eth.c

@@ -9,11 +9,13 @@
 #include <common.h>
 #include <command.h>
 #include <dm.h>
+#include <environment.h>
 #include <net.h>
 #include <miiphy.h>
 #include <phy.h>
 #include <asm/errno.h>
 #include <dm/device-internal.h>
+#include <dm/uclass-internal.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -294,6 +296,33 @@ static int eth_write_hwaddr(struct udevice *dev)
 	return ret;
 }
 
+static int on_ethaddr(const char *name, const char *value, enum env_op op,
+	int flags)
+{
+	int index;
+	int retval;
+	struct udevice *dev;
+
+	/* look for an index after "eth" */
+	index = simple_strtoul(name + 3, NULL, 10);
+
+	retval = uclass_find_device_by_seq(UCLASS_ETH, index, false, &dev);
+	if (!retval) {
+		struct eth_pdata *pdata = dev->platdata;
+		switch (op) {
+		case env_op_create:
+		case env_op_overwrite:
+			eth_parse_enetaddr(value, pdata->enetaddr);
+			break;
+		case env_op_delete:
+			memset(pdata->enetaddr, 0, 6);
+		}
+	}
+
+	return 0;
+}
+U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
+
 int eth_init(void)
 {
 	struct udevice *current;
@@ -311,25 +340,6 @@ int eth_init(void)
 		debug("Trying %s\n", current->name);
 
 		if (device_active(current)) {
-			uchar env_enetaddr[6];
-			struct eth_pdata *pdata = current->platdata;
-			int enetaddr_changed = 0;
-
-			/* Sync environment with network device */
-			if (eth_getenv_enetaddr_by_index("eth", current->seq,
-							 env_enetaddr)) {
-				enetaddr_changed = memcmp(pdata->enetaddr,
-					env_enetaddr, 6);
-				memcpy(pdata->enetaddr, env_enetaddr, 6);
-			} else {
-				memset(env_enetaddr, 0, 6);
-				enetaddr_changed = memcmp(pdata->enetaddr,
-					env_enetaddr, 6);
-				memset(pdata->enetaddr, 0, 6);
-			}
-			if (enetaddr_changed)
-				eth_write_hwaddr(current);
-
 			ret = eth_get_ops(current)->start(current);
 			if (ret >= 0) {
 				struct eth_device_priv *priv =
@@ -634,6 +644,36 @@ int eth_get_dev_index(void)
 	return eth_current->index;
 }
 
+static int on_ethaddr(const char *name, const char *value, enum env_op op,
+	int flags)
+{
+	int index;
+	struct eth_device *dev;
+
+	if (!eth_devices)
+		return 0;
+
+	/* look for an index after "eth" */
+	index = simple_strtoul(name + 3, NULL, 10);
+
+	dev = eth_devices;
+	do {
+		if (dev->index == index) {
+			switch (op) {
+			case env_op_create:
+			case env_op_overwrite:
+				eth_parse_enetaddr(value, dev->enetaddr);
+				break;
+			case env_op_delete:
+				memset(dev->enetaddr, 0, 6);
+			}
+		}
+	} while (dev != eth_devices);
+
+	return 0;
+}
+U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
+
 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 		   int eth_number)
 {
@@ -832,36 +872,13 @@ u32 ether_crc(size_t len, unsigned char const *p)
 
 int eth_init(void)
 {
-	struct eth_device *old_current, *dev;
+	struct eth_device *old_current;
 
 	if (!eth_current) {
 		puts("No ethernet found.\n");
 		return -ENODEV;
 	}
 
-	/* Sync environment with network devices */
-	dev = eth_devices;
-	do {
-		uchar env_enetaddr[6];
-		int enetaddr_changed = 0;
-
-		if (eth_getenv_enetaddr_by_index("eth", dev->index,
-						 env_enetaddr)) {
-			enetaddr_changed = memcmp(dev->enetaddr,
-				env_enetaddr, 6);
-			memcpy(dev->enetaddr, env_enetaddr, 6);
-		} else {
-			memset(env_enetaddr, 0, 6);
-			enetaddr_changed = memcmp(dev->enetaddr,
-				env_enetaddr, 6);
-			memset(dev->enetaddr, 0, 6);
-		}
-		if (enetaddr_changed)
-			eth_write_hwaddr(dev, "eth", dev->index);
-
-		dev = dev->next;
-	} while (dev != eth_devices);
-
 	old_current = eth_current;
 	do {
 		debug("Trying %s\n", eth_current->name);