a7y18lte-ubports/android_kernel_samsung_universal7885
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bonding: "primary_reselect" with "failure" is not working properly

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When "primary_reselect" is set to "failure", primary interface should
not become active until current active slave is down. But if we set first
member of bond device as a "primary" interface and "primary_reselect"
is set to "failure" then whenever primary interface's link get back(up)
it become active slave even if current active slave is still up.

With this patch, "bond_find_best_slave" will not traverse members if
primary interface is not candidate for failover/reselection and current
active slave is still up.

Signed-off-by: Mazhar Rana <mazhar.rana@cyberoam.com>
Signed-off-by: Jay Vosburgh <j.vosburgh@gmail.com>
Signed-off-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mazhar Rana 2015-07-07 15:04:50 +05:30 committed by David S. Miller
parent fc24f2b209
commit b5a983f314
1 changed files with 34 additions and 17 deletions
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51
drivers/net/bonding/bond_main.c
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@ -689,40 +689,57 @@ out:
} }
static bool bond_should_change_active(struct bonding *bond) static struct slave *bond_choose_primary_or_current(struct bonding *bond)
{ {
struct slave *prim = rtnl_dereference(bond->primary_slave); struct slave *prim = rtnl_dereference(bond->primary_slave);
struct slave *curr = rtnl_dereference(bond->curr_active_slave); struct slave *curr = rtnl_dereference(bond->curr_active_slave);
if (!prim || !curr || curr->link != BOND_LINK_UP) if (!prim || prim->link != BOND_LINK_UP) {
return true; if (!curr || curr->link != BOND_LINK_UP)
return NULL;
return curr;
}
if (bond->force_primary) { if (bond->force_primary) {
bond->force_primary = false; bond->force_primary = false;
return true; return prim;
}
if (!curr || curr->link != BOND_LINK_UP)
return prim;
/* At this point, prim and curr are both up */
switch (bond->params.primary_reselect) {
case BOND_PRI_RESELECT_ALWAYS:
return prim;
case BOND_PRI_RESELECT_BETTER:
if (prim->speed < curr->speed)
return curr;
if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
return curr;
return prim;
case BOND_PRI_RESELECT_FAILURE:
return curr;
default:
netdev_err(bond->dev, "impossible primary_reselect %d\n",
bond->params.primary_reselect);
return curr;
} }
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 * bond_find_best_slave - select the best available slave to be the active one
* @bond: our bonding struct * @bond: our bonding struct
*/ */
static struct slave *bond_find_best_slave(struct bonding *bond) static struct slave *bond_find_best_slave(struct bonding *bond)
{ {
struct slave *slave, *bestslave = NULL, *primary; struct slave *slave, *bestslave = NULL;
struct list_head *iter; struct list_head *iter;
int mintime = bond->params.updelay; int mintime = bond->params.updelay;
primary = rtnl_dereference(bond->primary_slave); slave = bond_choose_primary_or_current(bond);
if (primary && primary->link == BOND_LINK_UP && if (slave)
bond_should_change_active(bond)) return slave;
return primary;
bond_for_each_slave(bond, slave, iter) { bond_for_each_slave(bond, slave, iter) {
if (slave->link == BOND_LINK_UP) if (slave->link == BOND_LINK_UP)