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Date: Fri, 18 Sep 2009 21:52:29 +0200
From: Jiri Pirko <jpirko@...hat.com>
To: Nicolas de Pesloüan <nicolas.2p.debian@...e.fr>
Cc: netdev@...r.kernel.org, davem@...emloft.net, fubar@...ibm.com,
bonding-devel@...ts.sourceforge.net
Subject: Re: [PATCH net-next-2.6] bonding: introduce primary_reselect option
Fri, Sep 18, 2009 at 09:32:11PM CEST, nicolas.2p.debian@...e.fr wrote:
> Jiri Pirko a écrit :
>> (updated 3)
>>
>> In some cases there is not desirable to switch back to primary interface when
>> it's link recovers and rather stay with currently active one. We need to avoid
>> packetloss as much as we can in some cases. This is solved by introducing
>> primary_reselect option. Note that enslaved primary slave is set as current
>> active no matter what.
>>
>> Signed-off-by: Jiri Pirko <jpirko@...hat.com>
>>
>> diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
>> index d5181ce..fd650e0 100644
>> --- a/Documentation/networking/bonding.txt
>> +++ b/Documentation/networking/bonding.txt
>> @@ -614,6 +614,32 @@ primary
>> The primary option is only valid for active-backup mode.
>> +primary_reselect
>> +
>> + Specifies the behavior of the current active slave when the primary was
>> + down and comes back up. This option is designed to prevent
>> + flip-flopping between the primary slave and other slaves. The possible
>> + values and their respective effects are:
>> +
>> + always or 0 (default)
>> +
>> + The primary slave becomes the active slave whenever it comes
>> + back up.
>> +
>> + better or 1
>> +
>> + The primary slave becomes the active slave when it comes back
>> + up, if the speed and duplex of the primary slave is better
>> + than the speed and duplex of the current active slave.
>> +
>> + failure or 2
>> +
>> + The primary slave becomes the active slave only if the current
>> + active slave fails and the primary slave is up.
>> +
>> + When no slave are active, if the primary comes back up, it becomes the
>> + active slave, regardless of the value of primary_reselect.
>> +
>> 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 699bfdd..1127361 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 char *primary_reselect;
>> static char *lacp_rate;
>> static char *ad_select;
>> static char *xmit_hash_policy;
>> @@ -126,6 +127,13 @@ 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_reselect, charp, 0);
>> +MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
>> + "once it comes up; "
>> + "0 for always (default), "
>> + "1 for only if speed of primary is not "
>> + "better, "
>> + "2 for never");
>
> You should remove "not" for option value 1 and use the word failure for
> option value 2.
>
> MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
> "once it comes up; "
> "0 for always (default), "
> "1 for only if speed of primary is "
> "better, "
> "2 for only on active slave "
> "failure");
Okay, I wasn't sure how to put it here. This sounds good, going to resend.
Thanks Nicolas.
>
> Apart from this small detail, this sounds good for me.
>
>> module_param(lacp_rate, charp, 0);
>> MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
>> "(slow/fast)");
>> @@ -200,6 +208,13 @@ const struct bond_parm_tbl fail_over_mac_tbl[] = {
>> { NULL, -1},
>> };
>> +const struct bond_parm_tbl pri_reselect_tbl[] = {
>> +{ "always", BOND_PRI_RESELECT_ALWAYS},
>> +{ "better", BOND_PRI_RESELECT_BETTER},
>> +{ "failure", BOND_PRI_RESELECT_FAILURE},
>> +{ NULL, -1},
>> +};
>> +
>> struct bond_parm_tbl ad_select_tbl[] = {
>> { "stable", BOND_AD_STABLE},
>> { "bandwidth", BOND_AD_BANDWIDTH},
>> @@ -1070,6 +1085,25 @@ out:
>> }
>> +static bool bond_should_change_active(struct bonding *bond)
>> +{
>> + struct slave *prim = bond->primary_slave;
>> + struct slave *curr = bond->curr_active_slave;
>> +
>> + if (!prim || !curr || curr->link != BOND_LINK_UP)
>> + return true;
>> + if (bond->force_primary) {
>> + bond->force_primary = false;
>> + return true;
>> + }
>> + if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
>> + (prim->speed < curr->speed ||
>> + (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
>> + return false;
>> + if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
>> + return false;
>> + return true;
>> +}
>> /**
>> * find_best_interface - select the best available slave to be the active one
>> @@ -1094,7 +1128,8 @@ static struct slave *bond_find_best_slave(struct bonding *bond)
>> }
>> if ((bond->primary_slave) &&
>> - bond->primary_slave->link == BOND_LINK_UP) {
>> + bond->primary_slave->link == BOND_LINK_UP &&
>> + bond_should_change_active(bond)) {
>> new_active = bond->primary_slave;
>> }
>> @@ -1675,8 +1710,10 @@ 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);
>> @@ -4643,7 +4680,7 @@ int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
>> static int bond_check_params(struct bond_params *params)
>> {
>> - int arp_validate_value, fail_over_mac_value;
>> + int arp_validate_value, fail_over_mac_value, primary_reselect_value;
>> /*
>> * Convert string parameters.
>> @@ -4942,6 +4979,20 @@ static int bond_check_params(struct bond_params *params)
>> primary = NULL;
>> }
>> + if (primary && primary_reselect) {
>> + primary_reselect_value = bond_parse_parm(primary_reselect,
>> + pri_reselect_tbl);
>> + if (primary_reselect_value == -1) {
>> + pr_err(DRV_NAME
>> + ": Error: Invalid primary_reselect \"%s\"\n",
>> + primary_reselect ==
>> + NULL ? "NULL" : primary_reselect);
>> + return -EINVAL;
>> + }
>> + } else {
>> + primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
>> + }
>> +
>> if (fail_over_mac) {
>> fail_over_mac_value = bond_parse_parm(fail_over_mac,
>> fail_over_mac_tbl);
>> @@ -4973,6 +5024,7 @@ 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_reselect = primary_reselect_value;
>> 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 6044e12..42c44f2 100644
>> --- a/drivers/net/bonding/bond_sysfs.c
>> +++ b/drivers/net/bonding/bond_sysfs.c
>> @@ -1212,6 +1212,61 @@ static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR,
>> bonding_show_primary, bonding_store_primary);
>> /*
>> + * Show and set the primary_reselect flag.
>> + */
>> +static ssize_t bonding_show_primary_reselect(struct device *d,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + struct bonding *bond = to_bond(d);
>> +
>> + return sprintf(buf, "%s %d\n",
>> + pri_reselect_tbl[bond->params.primary_reselect].modename,
>> + bond->params.primary_reselect);
>> +}
>> +
>> +static ssize_t bonding_store_primary_reselect(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();
>> +
>> + new_value = bond_parse_parm(buf, pri_reselect_tbl);
>> + if (new_value < 0) {
>> + pr_err(DRV_NAME
>> + ": %s: Ignoring invalid primary_reselect value %.*s.\n",
>> + bond->dev->name,
>> + (int) strlen(buf) - 1, buf);
>> + ret = -EINVAL;
>> + goto out;
>> + } else {
>> + bond->params.primary_reselect = new_value;
>> + pr_info(DRV_NAME ": %s: setting primary_reselect to %s (%d).\n",
>> + bond->dev->name, pri_reselect_tbl[new_value].modename,
>> + new_value);
>> + if (new_value == BOND_PRI_RESELECT_ALWAYS ||
>> + new_value == BOND_PRI_RESELECT_BETTER) {
>> + 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);
>> + }
>> + }
>> +out:
>> + rtnl_unlock();
>> + return ret;
>> +}
>> +static DEVICE_ATTR(primary_reselect, S_IRUGO | S_IWUSR,
>> + bonding_show_primary_reselect,
>> + bonding_store_primary_reselect);
>> +
>> +/*
>> * Show and set the use_carrier flag.
>> */
>> static ssize_t bonding_show_carrier(struct device *d,
>> @@ -1500,6 +1555,7 @@ static struct attribute *per_bond_attrs[] = {
>> &dev_attr_num_unsol_na.attr,
>> &dev_attr_miimon.attr,
>> &dev_attr_primary.attr,
>> + &dev_attr_primary_reselect.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 6824771..b5b1530 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_reselect;
>> __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;
>> @@ -258,6 +260,10 @@ static inline bool bond_is_lb(const struct bonding *bond)
>> || bond->params.mode == BOND_MODE_ALB;
>> }
>> +#define BOND_PRI_RESELECT_ALWAYS 0
>> +#define BOND_PRI_RESELECT_BETTER 1
>> +#define BOND_PRI_RESELECT_FAILURE 2
>> +
>> #define BOND_FOM_NONE 0
>> #define BOND_FOM_ACTIVE 1
>> #define BOND_FOM_FOLLOW 2
>> @@ -348,6 +354,7 @@ extern const struct bond_parm_tbl bond_mode_tbl[];
>> extern const struct bond_parm_tbl xmit_hashtype_tbl[];
>> extern const struct bond_parm_tbl arp_validate_tbl[];
>> extern const struct bond_parm_tbl fail_over_mac_tbl[];
>> +extern const struct bond_parm_tbl pri_reselect_tbl[];
>> extern struct bond_parm_tbl ad_select_tbl[];
>> #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
>>
>
> Nicolas.
--
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