netdev - Re: [PATCHv2] bonding: Do not try to send packets over dead link in TLB mode.

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Date:	Sat, 12 Jul 2014 10:49:01 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Mahesh Bandewar <maheshb@...gle.com>
Cc:	Jay Vosburgh <j.vosburgh@...il.com>,
	Veaceslav Falico <vfalico@...hat.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Maciej Zenczykowski <maze@...gle.com>
Subject: Re: [PATCHv2] bonding: Do not try to send packets over dead link in
 TLB mode.

On Fri, 2014-07-11 at 14:10 -0700, Mahesh Bandewar wrote:
...
> This patch fixes these issues and distributes flows across the
> UP links only. Also the array construction of links which are
> capable of sending packets happen in the control path leaving
> only link-selection during the data-path.
...
> Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
> ---
...
>  
> +static int bond_tlb_update_slave_arr(struct bonding *bond)
> +{
> +	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
> +	struct slave *tx_slave;
> +	struct list_head *iter;
> +	struct tlb_up_slave *new_arr, *old_arr;
> +
> +	new_arr = kzalloc(offsetof(struct tlb_up_slave, arr[bond->slave_cnt]),
> +			  GFP_KERNEL);
> +	if (!new_arr)
> +		return -ENOMEM;
> +
> +	bond_for_each_slave(bond, tx_slave, iter) {
> +		if (bond_slave_can_tx(tx_slave))
> +			new_arr->arr[new_arr->count++] = tx_slave;
> +	}
> +
> +	old_arr = bond_info->slave_arr;

Check your patch with :

CONFIG_SPARSE_RCU_POINTER=y
make C=2 drivers/net/bonding/bond_alb.o

Hint : You need here to use

	old_arr = rtnl_dereference(bond_info->slave_arr);
	

> +	rcu_assign_pointer(bond_info->slave_arr, new_arr);
> +	if (old_arr)
> +		kfree_rcu(old_arr, rcu);
> +
> +	return 0;
> +}
> +


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