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Message-ID: <1453266833-28386-2-git-send-email-zyjzyj2000@gmail.com>
Date: Wed, 20 Jan 2016 13:13:53 +0800
From: <zyjzyj2000@...il.com>
To: <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>
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.
Because of link flap from the slave interface, if the notifier
is NETDEV_UP while the actual link state is down, it is not
necessary to continue.
Signed-off-by: Jay Vosburgh <jay.vosburgh@...onical.com>
Tested-by: Tantilov, Emil S <emil.s.tantilov@...el.com>
Signed-off-by: Zhu Yanjun <zyjzyj2000@...il.com>
---
drivers/net/bonding/bond_main.c | 317 +++++++++++++++++++++------------------
1 file changed, 170 insertions(+), 147 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 56b5605..9f67948 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2015,203 +2015,223 @@ 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);
- 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;
+ /* Because of link flap from the slave interface, it is possilbe that
+ * the notifiler is NETDEV_UP while the actual link state is down. If
+ * so, it is not necessary to contiune.
+ */
+ switch (event) {
+ case NETDEV_UP:
+ if (!link_state)
+ return 0;
+ break;
+
+ case NETDEV_DOWN:
+ if (link_state)
+ return 0;
+ break;
+ }
+
+ 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 +3039,9 @@ 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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