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Date: Tue, 29 Jan 2013 23:20:17 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Jay Vosburgh <fubar@...ibm.com>
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
Tue, Jan 29, 2013 at 11:17:49PM CET, fubar@...ibm.com wrote:
>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.
Okay - I will redo this.
>
> -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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>>
>
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