netdev - Re: [PATCH 4/4] net: bonding: add slave device addresses in mode alb

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Date:	Mon, 13 Apr 2009 07:56:38 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jiri Pirko <jpirko@...hat.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jgarzik@...ox.com, davem@...emloft.net,
	bridge@...ts.linux-foundation.org, fubar@...ibm.com,
	bonding-devel@...ts.sourceforge.net, kaber@...sh.net,
	mschmidt@...hat.com, dada1@...mosbay.com, ivecera@...hat.com
Subject: Re: [PATCH 4/4] net: bonding: add slave device addresses in mode
 alb

On Mon, 13 Apr 2009 10:46:15 +0200
Jiri Pirko <jpirko@...hat.com> wrote:

> When in mode alb, add all device addresses which belong to an enslaved slave
> device to the bond device. This ensures that all mac addresses will be
> treated as local and bonding in this mode will work fine in bridge.
> 
> Signed-off-by: Jiri Pirko <jpirko@...hat.com>
> ---
>  drivers/net/bonding/bond_main.c |   30 +++++++++++++++++++++++++++++-
>  1 files changed, 29 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 99610f3..47795c7 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -1385,6 +1385,11 @@ static void bond_setup_by_slave(struct net_device *bond_dev,
>  	bond->setup_by_slave = 1;
>  }
>  
> +static inline int should_copy_dev_addrs(struct bonding *bond)
> +{
> +	return bond->params.mode == BOND_MODE_ALB ? 1 : 0;
> +}

static inline bool should_copy_dev_addrs(const struct bonding *bond)
{
	return (bond->params.mode == BOND_MODE_ALB);
}

Three things are wrong with your style here:
   1. Needless use of tri-graph operator, just return the result
   2. Use const for test_foo() type functions
   3. Use bool to make it clearer what the result is.

>  /* enslave device <slave> to bond device <master> */
>  int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
>  {
> @@ -1510,6 +1515,13 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
>  	 */
>  	new_slave->original_flags = slave_dev->flags;
>  
> +	if (should_copy_dev_addrs(bond)) {
> +		res = dev_addr_add_multiple(bond_dev, slave_dev);
> +		if (res)
> +			goto err_free;
> +		dev_mac_address_changed(bond_dev);

The notifier (dev_mac_address_changed) should be part of dev_addr_add

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