netdev - Re: [PATCH net-next 2/2] bonding: remove alb_set_mac

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Message-ID: <537E17A5.8070604@gmail.com>
Date:	Thu, 22 May 2014 11:28:37 -0400
From:	Vlad Yasevich <vyasevich@...il.com>
To:	Veaceslav Falico <vfalico@...il.com>, netdev@...r.kernel.org
CC:	Jay Vosburgh <j.vosburgh@...il.com>,
	Andy Gospodarek <andy@...yhouse.net>
Subject: Re: [PATCH net-next 2/2] bonding: remove alb_set_mac_address()

On 05/22/2014 09:12 AM, Veaceslav Falico wrote:
> Currently it's called only from bond_alb_set_mac_address(), which is called
> only for ALB mode, and it does nothing in case the mode is ALB. So,
> basically, it's a no-op. All the needed functionality (modifying the active
> slave's mac address, per example) is handled by the
> bond_alb_set_mac_address() itself.
> 
> So remove it, as it's not needed.

>From the comments and code, it seems like it should be called for TLB
mode as well as it does that weird half-setting of the address that
TLB seems to want.  Is that not needed any more?

-vlad

> 
> CC: Jay Vosburgh <j.vosburgh@...il.com>
> CC: Andy Gospodarek <andy@...yhouse.net>
> Signed-off-by: Veaceslav Falico <vfalico@...il.com>
> ---
>  drivers/net/bonding/bond_alb.c | 61 ------------------------------------------
>  1 file changed, 61 deletions(-)
> 
> diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
> index 965518b..1d772b5 100644
> --- a/drivers/net/bonding/bond_alb.c
> +++ b/drivers/net/bonding/bond_alb.c
> @@ -1256,62 +1256,6 @@ static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slav
>  	return 0;
>  }
>  
> -/**
> - * alb_set_mac_address
> - * @bond:
> - * @addr:
> - *
> - * In TLB mode all slaves are configured to the bond's hw address, but set
> - * their dev_addr field to different addresses (based on their permanent hw
> - * addresses).
> - *
> - * For each slave, this function sets the interface to the new address and then
> - * changes its dev_addr field to its previous value.
> - *
> - * Unwinding assumes bond's mac address has not yet changed.
> - */
> -static int alb_set_mac_address(struct bonding *bond, void *addr)
> -{
> -	struct slave *slave, *rollback_slave;
> -	struct list_head *iter;
> -	struct sockaddr sa;
> -	char tmp_addr[ETH_ALEN];
> -	int res;
> -
> -	if (BOND_MODE(bond) == BOND_MODE_ALB)
> -		return 0;
> -
> -	bond_for_each_slave(bond, slave, iter) {
> -		/* save net_device's current hw address */
> -		ether_addr_copy(tmp_addr, slave->dev->dev_addr);
> -
> -		res = dev_set_mac_address(slave->dev, addr);
> -
> -		/* restore net_device's hw address */
> -		ether_addr_copy(slave->dev->dev_addr, tmp_addr);
> -
> -		if (res)
> -			goto unwind;
> -	}
> -
> -	return 0;
> -
> -unwind:
> -	memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
> -	sa.sa_family = bond->dev->type;
> -
> -	/* unwind from head to the slave that failed */
> -	bond_for_each_slave(bond, rollback_slave, iter) {
> -		if (rollback_slave == slave)
> -			break;
> -		ether_addr_copy(tmp_addr, rollback_slave->dev->dev_addr);
> -		dev_set_mac_address(rollback_slave->dev, &sa);
> -		ether_addr_copy(rollback_slave->dev->dev_addr, tmp_addr);
> -	}
> -
> -	return res;
> -}
> -
>  /************************ exported alb funcions ************************/
>  
>  int bond_alb_initialize(struct bonding *bond)
> @@ -1777,15 +1721,10 @@ int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
>  	struct bonding *bond = netdev_priv(bond_dev);
>  	struct sockaddr *sa = addr;
>  	struct slave *swap_slave;
> -	int res;
>  
>  	if (!is_valid_ether_addr(sa->sa_data))
>  		return -EADDRNOTAVAIL;
>  
> -	res = alb_set_mac_address(bond, addr);
> -	if (res)
> -		return res;
> -
>  	memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
>  
>  	/* If there is no curr_active_slave there is nothing else to do.
> 

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