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Date: Tue, 29 Jan 2013 14:17:49 -0800
From: Jay Vosburgh <fubar@...ibm.com>
To: Jiri Pirko <jiri@...nulli.us>
cc: netdev@...r.kernel.org, davem@...emloft.net, andy@...yhouse.net,
stephen@...workplumber.org, psimerda@...hat.com, dcbw@...hat.com
Subject: Re: [patch net-next V3] bond: have random dev address by default instead of zeroes
Jiri Pirko <jiri@...nulli.us> wrote:
>Tue, Jan 29, 2013 at 07:32:36PM CET, fubar@...ibm.com wrote:
>>Jiri Pirko <jiri@...nulli.us> wrote:
>>
>>>Makes more sense to have randomly generated address by default than to
>>>have all zeroes. It also allows user to for example put the bond into
>>>bridge without need to have any slaves in it.
>>>
>>>Also note that this changes only behaviour of bonds with no slaves. Once
>>>the first slave device is enslaved, its address will be used (no change
>>>here).
>>>
>>>Also, fix dev_assign_type values on the way.
>>>
>>>Reported-by: Pavel Šimerda <psimerda@...hat.com>
>>>Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>>>---
>>>
>>>v2->v3:
>>>- call_netdevice_notifiers is called after dev_addr change.
>>>- use bond->get_dev_addr_from_first_slave to know when to get addr from the
>>> first slave
>>
>> Was there a problem with using the dev_addr_type to determine
>>this? If it's really necessary, I think the name of this field is
>>really verbose; even "addr_from_first" should be sufficient in my mind.
>
>It is necessary. Bridge call dev_set_mac_address() which sets
>dev->addr_assign_type = NET_ADDR_SET and that causes unwanted behaviour.
Ok.
>And as for the verbosity thing, I like more verbose better in situations
>like this. Zero room for confusion.
Fair enough, but the name doesn't need to be a whole sentence.
I think something like "mac_from_first_slave" is just as clear, and I'd
even go as far as "mac_from_first". If it's really that complicated
(and I don't think this is), add a comment somewhere.
-J
>> -J
>>
>>---
>> -Jay Vosburgh, IBM Linux Technology Center, fubar@...ibm.com
>>
>>
>>>v1->v2:
>>>- fixed assign value of bond_dev->addr_assign_type in bond_set_dev_addr()
>>>- added note to patch description
>>>
>>> drivers/net/bonding/bond_main.c | 38 +++++++++++++++++++-------------------
>>> drivers/net/bonding/bonding.h | 1 +
>>> 2 files changed, 20 insertions(+), 19 deletions(-)
>>>
>>>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>>>index 564cf42..8692df8 100644
>>>--- a/drivers/net/bonding/bond_main.c
>>>+++ b/drivers/net/bonding/bond_main.c
>>>@@ -1320,14 +1320,15 @@ static void bond_netpoll_cleanup(struct net_device *bond_dev)
>>>
>>> /*---------------------------------- IOCTL ----------------------------------*/
>>>
>>>-static int bond_sethwaddr(struct net_device *bond_dev,
>>>- struct net_device *slave_dev)
>>>+static void bond_set_dev_addr(struct net_device *bond_dev,
>>>+ struct net_device *slave_dev)
>>> {
>>> pr_debug("bond_dev=%p\n", bond_dev);
>>> pr_debug("slave_dev=%p\n", slave_dev);
>>> pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
>>> memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
>>>- return 0;
>>>+ bond_dev->addr_assign_type = NET_ADDR_SET;
>>>+ call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
>>> }
>>>
>>> static netdev_features_t bond_fix_features(struct net_device *dev,
>>>@@ -1628,10 +1629,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
>>>
>>> /* If this is the first slave, then we need to set the master's hardware
>>> * address to be the same as the slave's. */
>>>- if (is_zero_ether_addr(bond->dev->dev_addr))
>>>- memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
>>>- slave_dev->addr_len);
>>>-
>>>+ if (bond->get_dev_addr_from_first_slave)
>>>+ bond_set_dev_addr(bond->dev, slave_dev);
>>>
>>> new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
>>> if (!new_slave) {
>>>@@ -2048,12 +2047,8 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
>>>
>>> if (bond->slave_cnt == 0) {
>>> bond_set_carrier(bond);
>>>-
>>>- /* if the last slave was removed, zero the mac address
>>>- * of the master so it will be set by the application
>>>- * to the mac address of the first slave
>>>- */
>>>- memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
>>>+ eth_hw_addr_random(bond_dev);
>>>+ bond->get_dev_addr_from_first_slave = true;
>>>
>>> if (bond_vlan_used(bond)) {
>>> pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
>>>@@ -2234,11 +2229,8 @@ static int bond_release_all(struct net_device *bond_dev)
>>> write_lock_bh(&bond->lock);
>>> }
>>>
>>>- /* zero the mac address of the master so it will be
>>>- * set by the application to the mac address of the
>>>- * first slave
>>>- */
>>>- memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
>>>+ eth_hw_addr_random(bond_dev);
>>>+ bond->get_dev_addr_from_first_slave = true;
>>>
>>> if (bond_vlan_used(bond)) {
>>> pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
>>>@@ -3708,7 +3700,8 @@ static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd
>>> break;
>>> case BOND_SETHWADDR_OLD:
>>> case SIOCBONDSETHWADDR:
>>>- res = bond_sethwaddr(bond_dev, slave_dev);
>>>+ bond_set_dev_addr(bond_dev, slave_dev);
>>>+ res = 0;
>>> break;
>>> case BOND_CHANGE_ACTIVE_OLD:
>>> case SIOCBONDCHANGEACTIVE:
>>>@@ -4858,6 +4851,13 @@ static int bond_init(struct net_device *bond_dev)
>>>
>>> bond_debug_register(bond);
>>>
>>>+ /* Ensure valid dev_addr */
>>>+ if (is_zero_ether_addr(bond_dev->dev_addr) &&
>>>+ bond_dev->addr_assign_type == NET_ADDR_PERM) {
>>>+ eth_hw_addr_random(bond_dev);
>>>+ bond->get_dev_addr_from_first_slave = true;
>>>+ }
>>>+
>>> __hw_addr_init(&bond->mc_list);
>>> return 0;
>>> }
>>>diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
>>>index 0d282d2..3200638 100644
>>>--- a/drivers/net/bonding/bonding.h
>>>+++ b/drivers/net/bonding/bonding.h
>>>@@ -248,6 +248,7 @@ struct bonding {
>>> /* debugging support via debugfs */
>>> struct dentry *debug_dir;
>>> #endif /* CONFIG_DEBUG_FS */
>>>+ bool get_dev_addr_from_first_slave;
>>> };
>>>
>>> static inline bool bond_vlan_used(struct bonding *bond)
>>>--
>>>1.8.1
>>>
>>
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