[PATCH] net: Bring up all interfaces before going interactive

[Sascha Hauer <s.hauer@pengutronix.de>]

So far we only bring up network interfaces when we actually need them.
This means we could be idling in the shell for long and once the user
decides to do networking he has to wait for the link to be established.
We can do better: Before going interactive bring up all known network
interfaces which makes the links established when the user needs them.

To implement this we have to rework carrier checking a bit, because
otherwise barebox would wait for the links to be established before
dropping to the shell.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 common/startup.c |  3 +++
 include/net.h    |  3 +++
 net/eth.c        | 34 +++++++++++++++++++++-------------
 3 files changed, 27 insertions(+), 13 deletions(-)

diff --git a/common/startup.c b/common/startup.c
index f53b73f81a..f63a0ae7d5 100644
--- a/common/startup.c
+++ b/common/startup.c
@@ -37,6 +37,7 @@
 #include <linux/ctype.h>
 #include <watchdog.h>
 #include <glob.h>
+#include <net.h>
 #include <bselftest.h>
 
 extern initcall_t __barebox_initcalls_start[], __barebox_early_initcalls_end[],
@@ -208,6 +209,8 @@ enum autoboot_state do_autoboot_countdown(void)
 				&outkey);
 	command_slice_acquire();
 
+	eth_open_all();
+
 	if (ret == 0)
 		autoboot_state = AUTOBOOT_BOOT;
 	else if (menu_exists && outkey == 'm')
diff --git a/include/net.h b/include/net.h
index 310bf5169d..338033d698 100644
--- a/include/net.h
+++ b/include/net.h
@@ -79,6 +79,8 @@ struct eth_device {
 #define ETH_MODE_STATIC 1
 #define ETH_MODE_DISABLED 2
 	unsigned int global_mode;
+
+	uint64_t last_link_check;
 };
 
 #define dev_to_edev(d) container_of(d, struct eth_device, dev)
@@ -109,6 +111,7 @@ int eth_open(struct eth_device *edev);
 void eth_close(struct eth_device *edev);
 int eth_send(struct eth_device *edev, void *packet, int length);	   /* Send a packet		*/
 int eth_rx(void);			/* Check for received packets	*/
+void eth_open_all(void);
 struct eth_device *of_find_eth_device_by_node(struct device_node *np);
 
 /* associate a MAC address to a ethernet device. Should be called by
diff --git a/net/eth.c b/net/eth.c
index bc641dc8e4..8f6ff7db3a 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -20,8 +20,6 @@
 #include <linux/ctype.h>
 #include <linux/stat.h>
 
-static uint64_t last_link_check;
-
 LIST_HEAD(netdev_list);
 
 struct eth_ethaddr {
@@ -173,7 +171,7 @@ int eth_complete(struct string_list *sl, char *instr)
 /*
  * Check for link if we haven't done so for longer.
  */
-static int eth_carrier_check(struct eth_device *edev, int force)
+static int eth_carrier_check(struct eth_device *edev, bool may_wait)
 {
 	int ret;
 
@@ -183,15 +181,17 @@ static int eth_carrier_check(struct eth_device *edev, int force)
 	if (!edev->phydev)
 		return 0;
 
-	if (force)
-		phy_wait_aneg_done(edev->phydev);
-
-	if (force || is_timeout(last_link_check, 5 * SECOND) ||
-			!edev->phydev->link) {
+	if (!edev->last_link_check ||
+	    is_timeout(edev->last_link_check, 5 * SECOND)) {
 		ret = phy_update_status(edev->phydev);
 		if (ret)
 			return ret;
-		last_link_check = get_time_ns();
+		edev->last_link_check = get_time_ns();
+	}
+
+	if (may_wait && !edev->phydev->link) {
+		phy_wait_aneg_done(edev->phydev);
+		edev->last_link_check = get_time_ns();
 	}
 
 	return edev->phydev->link ? 0 : -ENETDOWN;
@@ -237,7 +237,7 @@ int eth_send(struct eth_device *edev, void *packet, int length)
 	if (slice_acquired(eth_device_slice(edev)))
 		return eth_queue(edev, packet, length);
 
-	ret = eth_carrier_check(edev, 0);
+	ret = eth_carrier_check(edev, true);
 	if (ret)
 		return ret;
 
@@ -258,7 +258,7 @@ static void eth_do_work(struct eth_device *edev)
 	int ret;
 
 	if (!phy_acquired(edev->phydev)) {
-		ret = eth_carrier_check(edev, 0);
+		ret = eth_carrier_check(edev, false);
 		if (ret)
 			return;
 	}
@@ -455,12 +455,12 @@ int eth_open(struct eth_device *edev)
 	if (edev->active)
 		return 0;
 
+	edev->last_link_check = 0;
+
 	ret = edev->open(edev);
 	if (!ret)
 		edev->active = 1;
 
-	eth_carrier_check(edev, 1);
-
 	return ret;
 }
 
@@ -522,6 +522,14 @@ struct eth_device *of_find_eth_device_by_node(struct device_node *np)
 }
 EXPORT_SYMBOL(of_find_eth_device_by_node);
 
+void eth_open_all(void)
+{
+	struct eth_device *edev;
+
+	list_for_each_entry(edev, &netdev_list, list)
+		eth_open(edev);
+}
+
 static int of_populate_ethaddr(void)
 {
 	char str[sizeof("xx:xx:xx:xx:xx:xx")];
-- 
2.30.2