netdev - Re: [PATCH] bonding: rejoin multicast groups on VLANs

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Date:	Wed, 29 Sep 2010 10:17:13 -0300
From:	Flavio Leitner <fbl@...hat.com>
To:	netdev@...r.kernel.org
Cc:	bonding-devel@...ts.sourceforge.net,
	Jay Vosburgh <fubar@...ibm.com>
Subject: Re: [PATCH] bonding: rejoin multicast groups on VLANs


forgot CC to bonding-devel

On Wed, Sep 29, 2010 at 04:12:24AM -0300, Flavio Leitner wrote:
> It fixes bonding to rejoin multicast groups added
> to VLAN devices on top of bonding when a failover
> happens.
> 
> The first packet may be discarded, so the timer
> assure that at least 3 Reports are sent.
> 
> Signed-off-by: Flavio Leitner <fleitner@...hat.com>
> ---
>  drivers/net/bonding/bond_main.c |   59 +++++++++++++++++++++++++++++++++-----
>  drivers/net/bonding/bonding.h   |    2 +
>  2 files changed, 53 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 3b16f62..a23a5fa 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -865,18 +865,14 @@ static void bond_mc_del(struct bonding *bond, void *addr)
>  }
>  
>  
> -/*
> - * Retrieve the list of registered multicast addresses for the bonding
> - * device and retransmit an IGMP JOIN request to the current active
> - * slave.
> - */
> -static void bond_resend_igmp_join_requests(struct bonding *bond)
> +static void __bond_resend_igmp_join_requests(struct net_device *dev)
>  {
>  	struct in_device *in_dev;
>  	struct ip_mc_list *im;
>  
>  	rcu_read_lock();
> -	in_dev = __in_dev_get_rcu(bond->dev);
> +
> +	in_dev = __in_dev_get_rcu(dev);
>  	if (in_dev) {
>  		for (im = in_dev->mc_list; im; im = im->next)
>  			ip_mc_rejoin_group(im);
> @@ -885,6 +881,42 @@ static void bond_resend_igmp_join_requests(struct bonding *bond)
>  	rcu_read_unlock();
>  }
>  
> +
> +/*
> + * Retrieve the list of registered multicast addresses for the bonding
> + * device and retransmit an IGMP JOIN request to the current active
> + * slave.
> + */
> +static void bond_resend_igmp_join_requests(struct bonding *bond)
> +{
> +	struct net_device *vlan_dev;
> +	struct vlan_entry *vlan;
> +
> +	read_lock(&bond->lock);
> +	if (bond->kill_timers)
> +		goto out;
> +
> +	/* rejoin all groups on bond device */
> +	__bond_resend_igmp_join_requests(bond->dev);
> +
> +	if (!bond->vlgrp)
> +		goto reschedule;
> +
> +	/* rejoin all groups on vlan devices */
> +	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
> +		vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
> +		if (vlan_dev)
> +			__bond_resend_igmp_join_requests(vlan_dev);
> +	}
> +
> +reschedule:
> +	if (--bond->resend_igmp > 0)
> +		mod_timer(&bond->mc_timer, jiffies + HZ/5);
> +
> +out:
> +	read_unlock(&bond->lock);
> +}
> +
>  /*
>   * flush all members of flush->mc_list from device dev->mc_list
>   */
> @@ -944,7 +976,10 @@ static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
>  
>  		netdev_for_each_mc_addr(ha, bond->dev)
>  			dev_mc_add(new_active->dev, ha->addr);
> -		bond_resend_igmp_join_requests(bond);
> +
> +		/* rejoin multicast groups */
> +		bond->resend_igmp = 3;
> +		mod_timer(&bond->mc_timer, jiffies + 1);
>  	}
>  }
>  
> @@ -3741,9 +3776,15 @@ static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
>  static int bond_open(struct net_device *bond_dev)
>  {
>  	struct bonding *bond = netdev_priv(bond_dev);
> +	struct timer_list *mc_timer = &bond->mc_timer;
>  
>  	bond->kill_timers = 0;
>  
> +	/* multicast */
> +	init_timer(mc_timer);
> +	mc_timer->data = (unsigned long)bond;
> +	mc_timer->function = (void *)&bond_resend_igmp_join_requests;
> +
>  	if (bond_is_lb(bond)) {
>  		/* bond_alb_initialize must be called before the timer
>  		 * is started.
> @@ -3808,6 +3849,8 @@ static int bond_close(struct net_device *bond_dev)
>  
>  	write_unlock_bh(&bond->lock);
>  
> +	del_timer_sync(&bond->mc_timer);
> +
>  	if (bond->params.miimon) {  /* link check interval, in milliseconds. */
>  		cancel_delayed_work(&bond->mii_work);
>  	}
> diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
> index c6fdd85..5fd4164 100644
> --- a/drivers/net/bonding/bonding.h
> +++ b/drivers/net/bonding/bonding.h
> @@ -198,6 +198,8 @@ struct bonding {
>  	s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
>  	rwlock_t lock;
>  	rwlock_t curr_slave_lock;
> +	struct   timer_list mc_timer;
> +	s8       resend_igmp;
>  	s8       kill_timers;
>  	s8	 send_grat_arp;
>  	s8	 send_unsol_na;
> -- 
> 1.7.2.3
> 
> --
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-- 
Flavio
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