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Date: Thu, 13 Aug 2009 08:44:55 -0700
From: Jay Vosburgh <fubar@...ibm.com>
To: Jiri Pirko <jpirko@...hat.com>
cc: davem@...emloft.net, bonding-devel@...ts.sourceforge.net,
netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] bonding: introduce primary_lazy option
Jiri Pirko <jpirko@...hat.com> wrote:
>In some cases there is not desirable to switch back to primary interface when
>it's link recovers and rather stay wiith currently active one. We need to avoid
>packetloss as much as we can in some cases. This is solved by introducing
>primary_lazy option. Note that enslaved primary slave is set as current
>active no matter what.
Are you just looking for a way to insure that, when the bond
first comes up (is configured at boot, for example), a particular slave
is the active slave? In that case, why can't an explicit selection be
made via either ifenslave -c or /sys/class/net/bond0/bonding/active ?
-J
>Signed-off-by: Jiri Pirko <jpirko@...hat.com>
>
>diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
>index d5181ce..f1b82af 100644
>--- a/Documentation/networking/bonding.txt
>+++ b/Documentation/networking/bonding.txt
>@@ -614,6 +614,15 @@ primary
>
> The primary option is only valid for active-backup mode.
>
>+primary_lazy
>+
>+ Specifies the behaviour of the primary slave in case of
>+ it's link recovery has been detected. By default (value 0) the
>+ primary slave is set as active slave immediately after the link
>+ recovery. If the value is 1 then current active slave doesn't
>+ change as long as it's link status doesn't change. This prevents
>+ the bonding device from flip-flopping.
>+
> updelay
>
> Specifies the time, in milliseconds, to wait before enabling a
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 3bf0cc6..00fbb9d 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -94,6 +94,7 @@ static int downdelay;
> static int use_carrier = 1;
> static char *mode;
> static char *primary;
>+static int primary_lazy;
> static char *lacp_rate;
> static char *ad_select;
> static char *xmit_hash_policy;
>@@ -126,6 +127,9 @@ MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
> "6 for balance-alb");
> module_param(primary, charp, 0);
> MODULE_PARM_DESC(primary, "Primary network device to use");
>+module_param(primary_lazy, int, 0);
>+MODULE_PARM_DESC(primary_lazy, "Do not set primary slave active once it comes up; "
>+ "0 for off (default), 1 for on");
> module_param(lacp_rate, charp, 0);
> MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
> "(slow/fast)");
>@@ -1067,7 +1071,6 @@ out:
>
> }
>
>-
> /**
> * find_best_interface - select the best available slave to be the active one
> * @bond: our bonding struct
>@@ -1097,9 +1100,11 @@ static struct slave *bond_find_best_slave(struct bonding *bond)
> * and primary_slave that may be up and able to arp
> */
> if ((bond->primary_slave) &&
>- (!bond->params.arp_interval) &&
>- (IS_UP(bond->primary_slave->dev))) {
>+ (IS_UP(bond->primary_slave->dev)) &&
>+ (!(bond->params.primary_lazy && old_active &&
>+ (IS_UP(old_active->dev))) || bond->force_primary)) {
> new_active = bond->primary_slave;
>+ bond->force_primary = false;
> }
>
> /* remember where to stop iterating over the slaves */
>@@ -1674,8 +1679,10 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
>
> if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
> /* if there is a primary slave, remember it */
>- if (strcmp(bond->params.primary, new_slave->dev->name) == 0)
>+ if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
> bond->primary_slave = new_slave;
>+ bond->force_primary = true;
>+ }
> }
>
> write_lock_bh(&bond->curr_slave_lock);
>@@ -2929,7 +2936,9 @@ static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
> */
> if (bond->primary_slave &&
> (bond->primary_slave != bond->curr_active_slave) &&
>- (bond->primary_slave->link == BOND_LINK_UP))
>+ (bond->primary_slave->link == BOND_LINK_UP) &&
>+ !(bond->params.primary_lazy && bond->curr_active_slave &&
>+ bond->curr_active_slave->link == BOND_LINK_UP))
> commit++;
>
> read_unlock(&bond->curr_slave_lock);
>@@ -3035,7 +3044,9 @@ static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
> */
> if (bond->primary_slave &&
> (bond->primary_slave != bond->curr_active_slave) &&
>- (bond->primary_slave->link == BOND_LINK_UP)) {
>+ (bond->primary_slave->link == BOND_LINK_UP) &&
>+ !(bond->params.primary_lazy && bond->curr_active_slave &&
>+ bond->curr_active_slave->link == BOND_LINK_UP)) {
> write_lock_bh(&bond->curr_slave_lock);
> bond_change_active_slave(bond, bond->primary_slave);
> write_unlock_bh(&bond->curr_slave_lock);
>@@ -4987,6 +4998,17 @@ static int bond_check_params(struct bond_params *params)
> primary = NULL;
> }
>
>+ if (primary) {
>+ if ((primary_lazy != 0) && (primary_lazy != 1)) {
>+ pr_warning(DRV_NAME
>+ ": Warning: primary_lazy module parameter "
>+ "(%d), not of valid value (0/1), so it was "
>+ "set to 0\n",
>+ primary_lazy);
>+ primary_lazy = 1;
>+ }
>+ }
>+
> if (fail_over_mac) {
> fail_over_mac_value = bond_parse_parm(fail_over_mac,
> fail_over_mac_tbl);
>@@ -5018,6 +5040,7 @@ static int bond_check_params(struct bond_params *params)
> params->use_carrier = use_carrier;
> params->lacp_fast = lacp_fast;
> params->primary[0] = 0;
>+ params->primary_lazy = primary_lazy;
> params->fail_over_mac = fail_over_mac_value;
>
> if (primary) {
>diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
>index 55bf34f..573fe82 100644
>--- a/drivers/net/bonding/bond_sysfs.c
>+++ b/drivers/net/bonding/bond_sysfs.c
>@@ -1209,6 +1209,59 @@ static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR,
> bonding_show_primary, bonding_store_primary);
>
> /*
>+ * Show and set the primary_lazy flag.
>+ */
>+static ssize_t bonding_show_primary_lazy(struct device *d,
>+ struct device_attribute *attr,
>+ char *buf)
>+{
>+ struct bonding *bond = to_bond(d);
>+
>+ return sprintf(buf, "%d\n", bond->params.primary_lazy);
>+}
>+
>+static ssize_t bonding_store_primary_lazy(struct device *d,
>+ struct device_attribute *attr,
>+ const char *buf, size_t count)
>+{
>+ int new_value, ret = count;
>+ struct bonding *bond = to_bond(d);
>+
>+ if (!rtnl_trylock())
>+ return restart_syscall();
>+
>+ if (sscanf(buf, "%d", &new_value) != 1) {
>+ pr_err(DRV_NAME
>+ ": %s: no primary_lazy value specified.\n",
>+ bond->dev->name);
>+ ret = -EINVAL;
>+ goto out;
>+ }
>+ if ((new_value == 0) || (new_value == 1)) {
>+ bond->params.primary_lazy = new_value;
>+ pr_info(DRV_NAME ": %s: Setting primary_lazy to %d.\n",
>+ bond->dev->name, new_value);
>+ if (!bond->params.primary_lazy) {
>+ bond->force_primary = true;
>+ read_lock(&bond->lock);
>+ write_lock_bh(&bond->curr_slave_lock);
>+ bond_select_active_slave(bond);
>+ write_unlock_bh(&bond->curr_slave_lock);
>+ read_unlock(&bond->lock);
>+ }
>+ } else {
>+ pr_info(DRV_NAME
>+ ": %s: Ignoring invalid primary_lazy value %d.\n",
>+ bond->dev->name, new_value);
>+ }
>+out:
>+ rtnl_unlock();
>+ return count;
>+}
>+static DEVICE_ATTR(primary_lazy, S_IRUGO | S_IWUSR,
>+ bonding_show_primary_lazy, bonding_store_primary_lazy);
>+
>+/*
> * Show and set the use_carrier flag.
> */
> static ssize_t bonding_show_carrier(struct device *d,
>@@ -1497,6 +1550,7 @@ static struct attribute *per_bond_attrs[] = {
> &dev_attr_num_unsol_na.attr,
> &dev_attr_miimon.attr,
> &dev_attr_primary.attr,
>+ &dev_attr_primary_lazy.attr,
> &dev_attr_use_carrier.attr,
> &dev_attr_active_slave.attr,
> &dev_attr_mii_status.attr,
>diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
>index 6290a50..ac35c6c 100644
>--- a/drivers/net/bonding/bonding.h
>+++ b/drivers/net/bonding/bonding.h
>@@ -131,6 +131,7 @@ struct bond_params {
> int lacp_fast;
> int ad_select;
> char primary[IFNAMSIZ];
>+ int primary_lazy;
> __be32 arp_targets[BOND_MAX_ARP_TARGETS];
> };
>
>@@ -190,6 +191,7 @@ struct bonding {
> struct slave *curr_active_slave;
> struct slave *current_arp_slave;
> struct slave *primary_slave;
>+ bool force_primary;
> s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
> rwlock_t lock;
> rwlock_t curr_slave_lock;
---
-Jay Vosburgh, IBM Linux Technology Center, fubar@...ibm.com
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