Commit b5a983f3 authored by Mazhar Rana's avatar Mazhar Rana Committed by David S. Miller
Browse files

bonding: "primary_reselect" with "failure" is not working properly 



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: default avatarMazhar Rana <mazhar.rana@cyberoam.com>
Signed-off-by: default avatarJay Vosburgh <j.vosburgh@gmail.com>
Signed-off-by: default avatarJay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fc24f2b2

drivers/net/bonding/bond_main.c

+34 −17
Original line number Diff line number Diff line
@@ -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 *curr = rtnl_dereference(bond->curr_active_slave);



	if (!prim || !curr || curr->link != BOND_LINK_UP)

		return true;

	if (!prim || prim->link != BOND_LINK_UP) {

		if (!curr || curr->link != BOND_LINK_UP)

			return NULL;

		return curr;

	}



	if (bond->force_primary) {

		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

 */

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;

	int mintime = bond->params.updelay;



	primary = rtnl_dereference(bond->primary_slave);

	if (primary && primary->link == BOND_LINK_UP &&

	    bond_should_change_active(bond))

		return primary;

	slave = bond_choose_primary_or_current(bond);

	if (slave)

		return slave;



	bond_for_each_slave(bond, slave, iter) {

		if (slave->link == BOND_LINK_UP)

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