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Date: Tue, 22 Oct 2013 15:38:49 +0800
From: Ding Tianhong <dingtianhong@...wei.com>
To: Veaceslav Falico <vfalico@...hat.com>
CC: <netdev@...r.kernel.org>, <jiri@...nulli.us>,
Jay Vosburgh <fubar@...ibm.com>,
Andy Gospodarek <andy@...yhouse.net>
Subject: Re: [PATCH net-next v2] bonding: move bond-specific init after enslave
happens
On 2013/10/21 17:48, Veaceslav Falico wrote:
> As Jiri noted, currently we first do all bonding-specific initialization
> (specifically - bond_select_active_slave(bond)) before we actually attach
> the slave (so that it becomes visible through bond_for_each_slave() and
> friends). This might result in bond_select_active_slave() not seeing the
> first/new slave and, thus, not actually selecting an active slave.
>
> Fix this by moving all the bond-related init part after we've actually
> completely initialized and linked (via bond_master_upper_dev_link()) the
> new slave.
>
> Also, remove the bond_(de/a)ttach_slave(), it's useless to have functions
> to ++/-- one int.
>
> After this we have all the initialization of the new slave *before*
> linking, and all the stuff that needs to be done on bonding *after* it. It
> has also a bonus effect - we can remove the locking on the new slave init
> completely, and only use it for bond_select_active_slave().
>
> Reported-by: Jiri Pirko <jiri@...nulli.us>
> CC: Jay Vosburgh <fubar@...ibm.com>
> CC: Andy Gospodarek <andy@...yhouse.net>
> Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
> ---
>
> Notes:
> v1 -> v2:
> Move the bond_(de/a)ttach_slave() functionality, and remove these
> functions.
>
> drivers/net/bonding/bond_main.c | 65 +++++++++--------------------------------
> 1 file changed, 14 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index d90734f..2daa066 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -967,33 +967,6 @@ void bond_select_active_slave(struct bonding *bond)
> }
> }
>
> -/*--------------------------- slave list handling ---------------------------*/
> -
> -/*
> - * This function attaches the slave to the end of list.
> - *
> - * bond->lock held for writing by caller.
> - */
> -static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
> -{
> - bond->slave_cnt++;
> -}
> -
> -/*
> - * This function detaches the slave from the list.
> - * WARNING: no check is made to verify if the slave effectively
> - * belongs to <bond>.
> - * Nothing is freed on return, structures are just unchained.
> - * If any slave pointer in bond was pointing to <slave>,
> - * it should be changed by the calling function.
> - *
> - * bond->lock held for writing by caller.
> - */
> -static void bond_detach_slave(struct bonding *bond, struct slave *slave)
> -{
> - bond->slave_cnt--;
> -}
> -
> #ifdef CONFIG_NET_POLL_CONTROLLER
> static inline int slave_enable_netpoll(struct slave *slave)
> {
> @@ -1471,22 +1444,13 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> goto err_close;
> }
>
> - write_lock_bh(&bond->lock);
> -
> prev_slave = bond_last_slave(bond);
> - bond_attach_slave(bond, new_slave);
>
> new_slave->delay = 0;
> new_slave->link_failure_count = 0;
>
> - write_unlock_bh(&bond->lock);
> -
> - bond_compute_features(bond);
> -
> bond_update_speed_duplex(new_slave);
>
> - read_lock(&bond->lock);
> -
> new_slave->last_arp_rx = jiffies -
> (msecs_to_jiffies(bond->params.arp_interval) + 1);
> for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
> @@ -1547,12 +1511,9 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> }
> }
>
> - write_lock_bh(&bond->curr_slave_lock);
> -
> switch (bond->params.mode) {
> case BOND_MODE_ACTIVEBACKUP:
> bond_set_slave_inactive_flags(new_slave);
> - bond_select_active_slave(bond);
> break;
> case BOND_MODE_8023AD:
> /* in 802.3ad mode, the internal mechanism
> @@ -1578,7 +1539,6 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> case BOND_MODE_ALB:
> bond_set_active_slave(new_slave);
> bond_set_slave_inactive_flags(new_slave);
> - bond_select_active_slave(bond);
> break;
> default:
> pr_debug("This slave is always active in trunk mode\n");
> @@ -1596,10 +1556,6 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> break;
> } /* switch(bond_mode) */
>
> - write_unlock_bh(&bond->curr_slave_lock);
> -
> - bond_set_carrier(bond);
> -
> #ifdef CONFIG_NET_POLL_CONTROLLER
> slave_dev->npinfo = bond->dev->npinfo;
> if (slave_dev->npinfo) {
> @@ -1614,8 +1570,6 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> }
> #endif
>
> - read_unlock(&bond->lock);
> -
> res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
> new_slave);
> if (res) {
> @@ -1629,6 +1583,17 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> goto err_unregister;
> }
>
> + bond->slave_cnt++;
> + bond_compute_features(bond);
> + bond_set_carrier(bond);
> +
> + if (USES_PRIMARY(bond->params.mode)) {
> + 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);
> + }
>
> pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
> bond_dev->name, slave_dev->name,
> @@ -1648,7 +1613,6 @@ err_detach:
>
> vlan_vids_del_by_dev(slave_dev, bond_dev);
> write_lock_bh(&bond->lock);
> - bond_detach_slave(bond, new_slave);
> if (bond->primary_slave == new_slave)
> bond->primary_slave = NULL;
> if (bond->curr_active_slave == new_slave) {
> @@ -1686,7 +1650,6 @@ err_free:
> kfree(new_slave);
>
> err_undo_flags:
> - bond_compute_features(bond);
> /* Enslave of first slave has failed and we need to fix master's mac */
> if (!bond_has_slaves(bond) &&
> ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr))
> @@ -1740,6 +1703,9 @@ static int __bond_release_one(struct net_device *bond_dev,
>
> write_unlock_bh(&bond->lock);
>
> + /* release the slave from its bond */
> + bond->slave_cnt--;
> +
> bond_upper_dev_unlink(bond_dev, slave_dev);
> /* unregister rx_handler early so bond_handle_frame wouldn't be called
> * for this slave anymore.
> @@ -1764,9 +1730,6 @@ static int __bond_release_one(struct net_device *bond_dev,
>
> bond->current_arp_slave = NULL;
>
> - /* release the slave from its bond */
> - bond_detach_slave(bond, slave);
> -
> if (!all && !bond->params.fail_over_mac) {
> if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
> bond_has_slaves(bond))
>
Acked-by: Ding Tianhong@...wei.com
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