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Date:	Thu, 28 Jan 2016 16:44:55 +0800
From:	<zyjzyj2000@...il.com>
To:	<emil.s.tantilov@...el.com>, <jay.vosburgh@...onical.com>,
	<zyjzyj2000@...il.com>, <mkubecek@...e.cz>, <vfalico@...il.com>,
	<gospo@...ulusnetworks.com>, <netdev@...r.kernel.org>,
	<boris.shteinbock@...driver.com>
Subject: [PATCH 1/1] bonding: Use notifiers for slave link state detection

From: Zhu Yanjun <zyjzyj2000@...il.com>

This is just a test patch. Jay and Emil helped me a lot. The original patch
is in net-next. But kernel v4.4 needs this patch, too. As such, I backport
to kernel v4.4.
 
Bonding will utilize notifier callbacks to detect slave
link state changes. It is intended to be used with miimon
set to zero, and does not support the updelay or downdelay
options to bonding.

Signed-off-by: Zhu Yanjun <zyjzyj2000@...il.com>
---
 drivers/net/bonding/bond_main.c |  303 ++++++++++++++++++++-------------------
 1 file changed, 155 insertions(+), 148 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 56b5605..5156ad1 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2015,203 +2015,207 @@ static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *in
 /*-------------------------------- Monitoring -------------------------------*/
 
 /* called with rcu_read_lock() */
-static int bond_miimon_inspect(struct bonding *bond)
+static int bond_miimon_inspect_slave(struct bonding *bond, struct slave *slave,
+				     unsigned long event)
 {
-	int link_state, commit = 0;
-	struct list_head *iter;
-	struct slave *slave;
+	int link_state;
 	bool ignore_updelay;
 
-	ignore_updelay = !rcu_dereference(bond->curr_active_slave);
+	ignore_updelay = !rcu_dereference_rtnl(bond->curr_active_slave);
 
-	bond_for_each_slave_rcu(bond, slave, iter) {
-		slave->new_link = BOND_LINK_NOCHANGE;
+	slave->new_link = BOND_LINK_NOCHANGE;
 
-		link_state = bond_check_dev_link(bond, slave->dev, 0);
+	link_state = bond_check_dev_link(bond, slave->dev, 0);
 
-		switch (slave->link) {
-		case BOND_LINK_UP:
-			if (link_state)
-				continue;
+	switch (slave->link) {
+	case BOND_LINK_UP:
+		if (link_state)
+			return 0;
 
-			bond_set_slave_link_state(slave, BOND_LINK_FAIL,
+		bond_set_slave_link_state(slave, BOND_LINK_FAIL,
+					  BOND_SLAVE_NOTIFY_LATER);
+		slave->delay = bond->params.downdelay;
+		if (slave->delay) {
+			netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
+				    (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) ?
+				    (bond_is_active_slave(slave) ?
+				     "active " : "backup ") : "",
+				    slave->dev->name,
+				    bond->params.downdelay * bond->params.miimon);
+		}
+		/*FALLTHRU*/
+	case BOND_LINK_FAIL:
+		if (link_state) {
+			/* recovered before downdelay expired */
+			bond_set_slave_link_state(slave, BOND_LINK_UP,
 						  BOND_SLAVE_NOTIFY_LATER);
-			slave->delay = bond->params.downdelay;
-			if (slave->delay) {
-				netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
-					    (BOND_MODE(bond) ==
-					     BOND_MODE_ACTIVEBACKUP) ?
-					     (bond_is_active_slave(slave) ?
-					      "active " : "backup ") : "",
-					    slave->dev->name,
-					    bond->params.downdelay * bond->params.miimon);
-			}
-			/*FALLTHRU*/
-		case BOND_LINK_FAIL:
-			if (link_state) {
-				/* recovered before downdelay expired */
-				bond_set_slave_link_state(slave, BOND_LINK_UP,
-							  BOND_SLAVE_NOTIFY_LATER);
-				slave->last_link_up = jiffies;
-				netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
-					    (bond->params.downdelay - slave->delay) *
-					    bond->params.miimon,
-					    slave->dev->name);
-				continue;
-			}
+			slave->last_link_up = jiffies;
+			netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
+				    (bond->params.downdelay - slave->delay) *
+				    bond->params.miimon, slave->dev->name);
+			return 0;
+		}
 
-			if (slave->delay <= 0) {
-				slave->new_link = BOND_LINK_DOWN;
-				commit++;
-				continue;
-			}
+		if (slave->delay <= 0) {
+			slave->new_link = BOND_LINK_DOWN;
+			return 1;
+		}
 
-			slave->delay--;
-			break;
+		slave->delay--;
+		break;
 
-		case BOND_LINK_DOWN:
-			if (!link_state)
-				continue;
+	case BOND_LINK_DOWN:
+		if (!link_state)
+			return 0;
 
-			bond_set_slave_link_state(slave, BOND_LINK_BACK,
-						  BOND_SLAVE_NOTIFY_LATER);
-			slave->delay = bond->params.updelay;
-
-			if (slave->delay) {
-				netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
-					    slave->dev->name,
-					    ignore_updelay ? 0 :
-					    bond->params.updelay *
-					    bond->params.miimon);
-			}
-			/*FALLTHRU*/
-		case BOND_LINK_BACK:
-			if (!link_state) {
-				bond_set_slave_link_state(slave,
-							  BOND_LINK_DOWN,
-							  BOND_SLAVE_NOTIFY_LATER);
-				netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
-					    (bond->params.updelay - slave->delay) *
-					    bond->params.miimon,
-					    slave->dev->name);
+		bond_set_slave_link_state(slave, BOND_LINK_BACK,
+					  BOND_SLAVE_NOTIFY_LATER);
+		slave->delay = bond->params.updelay;
 
-				continue;
-			}
+		if (slave->delay) {
+			netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
+				    slave->dev->name, ignore_updelay ? 0 :
+				    bond->params.updelay * bond->params.miimon);
+		}
+		/*FALLTHRU*/
+	case BOND_LINK_BACK:
+		if (!link_state) {
+			bond_set_slave_link_state(slave, BOND_LINK_DOWN,
+						  BOND_SLAVE_NOTIFY_LATER);
+			netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
+				    (bond->params.updelay - slave->delay) *
+				    bond->params.miimon, slave->dev->name);
 
-			if (ignore_updelay)
-				slave->delay = 0;
+			return 0;
+		}
 
-			if (slave->delay <= 0) {
-				slave->new_link = BOND_LINK_UP;
-				commit++;
-				ignore_updelay = false;
-				continue;
-			}
+		if (ignore_updelay)
+			slave->delay = 0;
 
-			slave->delay--;
-			break;
+		if (slave->delay <= 0) {
+			slave->new_link = BOND_LINK_UP;
+			return 1;
 		}
+
+		slave->delay--;
+		break;
 	}
 
-	return commit;
+	return 0;
 }
 
-static void bond_miimon_commit(struct bonding *bond)
+static int bond_miimon_inspect(struct bonding *bond)
 {
 	struct list_head *iter;
-	struct slave *slave, *primary;
+	struct slave *slave;
+	int commit = 0;
 
-	bond_for_each_slave(bond, slave, iter) {
-		switch (slave->new_link) {
-		case BOND_LINK_NOCHANGE:
-			continue;
+	bond_for_each_slave_rcu(bond, slave, iter)
+		commit += bond_miimon_inspect_slave(bond, slave, 0xFF);
 
-		case BOND_LINK_UP:
-			bond_set_slave_link_state(slave, BOND_LINK_UP,
-						  BOND_SLAVE_NOTIFY_NOW);
-			slave->last_link_up = jiffies;
+	return commit;
+}
 
-			primary = rtnl_dereference(bond->primary_slave);
-			if (BOND_MODE(bond) == BOND_MODE_8023AD) {
-				/* prevent it from being the active one */
-				bond_set_backup_slave(slave);
-			} else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
-				/* make it immediately active */
-				bond_set_active_slave(slave);
-			} else if (slave != primary) {
-				/* prevent it from being the active one */
-				bond_set_backup_slave(slave);
-			}
+static void bond_miimon_commit_slave(struct bonding *bond, struct slave *slave)
+{
+	struct slave *primary;
 
-			netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
-				    slave->dev->name,
-				    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
-				    slave->duplex ? "full" : "half");
+	switch (slave->new_link) {
+	case BOND_LINK_NOCHANGE:
+		return;
 
-			/* notify ad that the link status has changed */
-			if (BOND_MODE(bond) == BOND_MODE_8023AD)
-				bond_3ad_handle_link_change(slave, BOND_LINK_UP);
+	case BOND_LINK_UP:
+		bond_set_slave_link_state(slave, BOND_LINK_UP,
+					  BOND_SLAVE_NOTIFY_NOW);
+		slave->last_link_up = jiffies;
 
-			if (bond_is_lb(bond))
-				bond_alb_handle_link_change(bond, slave,
-							    BOND_LINK_UP);
+		primary = rtnl_dereference(bond->primary_slave);
+		if (BOND_MODE(bond) == BOND_MODE_8023AD) {
+			/* prevent it from being the active one */
+			bond_set_backup_slave(slave);
+		} else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
+			/* make it immediately active */
+			bond_set_active_slave(slave);
+		} else if (slave != primary) {
+			/* prevent it from being the active one */
+			bond_set_backup_slave(slave);
+		}
 
-			if (BOND_MODE(bond) == BOND_MODE_XOR)
-				bond_update_slave_arr(bond, NULL);
+		netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
+			    slave->dev->name,
+			    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
+			    slave->duplex ? "full" : "half");
 
-			if (!bond->curr_active_slave || slave == primary)
-				goto do_failover;
+		/* notify ad that the link status has changed */
+		if (BOND_MODE(bond) == BOND_MODE_8023AD)
+			bond_3ad_handle_link_change(slave, BOND_LINK_UP);
 
-			continue;
+		if (bond_is_lb(bond))
+			bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
 
-		case BOND_LINK_DOWN:
-			if (slave->link_failure_count < UINT_MAX)
-				slave->link_failure_count++;
+		if (BOND_MODE(bond) == BOND_MODE_XOR)
+			bond_update_slave_arr(bond, NULL);
 
-			bond_set_slave_link_state(slave, BOND_LINK_DOWN,
-						  BOND_SLAVE_NOTIFY_NOW);
+		if (!bond->curr_active_slave || slave == primary)
+			goto do_failover;
 
-			if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
-			    BOND_MODE(bond) == BOND_MODE_8023AD)
-				bond_set_slave_inactive_flags(slave,
-							      BOND_SLAVE_NOTIFY_NOW);
+		goto out;
 
-			netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
-				    slave->dev->name);
+	case BOND_LINK_DOWN:
+		if (slave->link_failure_count < UINT_MAX)
+			slave->link_failure_count++;
 
-			if (BOND_MODE(bond) == BOND_MODE_8023AD)
-				bond_3ad_handle_link_change(slave,
-							    BOND_LINK_DOWN);
+		bond_set_slave_link_state(slave, BOND_LINK_DOWN,
+					  BOND_SLAVE_NOTIFY_NOW);
 
-			if (bond_is_lb(bond))
-				bond_alb_handle_link_change(bond, slave,
-							    BOND_LINK_DOWN);
+		if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
+		    BOND_MODE(bond) == BOND_MODE_8023AD)
+			bond_set_slave_inactive_flags(slave,
+						      BOND_SLAVE_NOTIFY_NOW);
 
-			if (BOND_MODE(bond) == BOND_MODE_XOR)
-				bond_update_slave_arr(bond, NULL);
+		netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
+			    slave->dev->name);
 
-			if (slave == rcu_access_pointer(bond->curr_active_slave))
-				goto do_failover;
+		if (BOND_MODE(bond) == BOND_MODE_8023AD)
+			bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
 
-			continue;
+		if (bond_is_lb(bond))
+			bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
 
-		default:
-			netdev_err(bond->dev, "invalid new link %d on slave %s\n",
-				   slave->new_link, slave->dev->name);
-			slave->new_link = BOND_LINK_NOCHANGE;
+		if (BOND_MODE(bond) == BOND_MODE_XOR)
+			bond_update_slave_arr(bond, NULL);
 
-			continue;
-		}
+		if (slave == rcu_access_pointer(bond->curr_active_slave))
+			goto do_failover;
 
-do_failover:
-		block_netpoll_tx();
-		bond_select_active_slave(bond);
-		unblock_netpoll_tx();
+		goto out;
+
+	default:
+		netdev_err(bond->dev, "invalid new link %d on slave %s\n",
+			   slave->new_link, slave->dev->name);
+		slave->new_link = BOND_LINK_NOCHANGE;
+
+		goto out;
 	}
 
+do_failover:
+	block_netpoll_tx();
+	bond_select_active_slave(bond);
+	unblock_netpoll_tx();
+
+out:
 	bond_set_carrier(bond);
 }
 
+static void bond_miimon_commit(struct bonding *bond)
+{
+	struct list_head *iter;
+	struct slave *slave;
+
+	bond_for_each_slave(bond, slave, iter)
+		bond_miimon_commit_slave(bond, slave);
+}
+
 /* bond_mii_monitor
  *
  * Really a wrapper that splits the mii monitor into two phases: an
@@ -3019,6 +3023,9 @@ static int bond_slave_netdev_event(unsigned long event,
 			bond_3ad_adapter_speed_duplex_changed(slave);
 		/* Fallthrough */
 	case NETDEV_DOWN:
+		if (bond_miimon_inspect_slave(bond, slave, event))
+			bond_miimon_commit_slave(bond, slave);
+
 		/* Refresh slave-array if applicable!
 		 * If the setup does not use miimon or arpmon (mode-specific!),
 		 * then these events will not cause the slave-array to be
-- 
1.7.9.5

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