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bonding: IGMP handling cleanup 

Instead of iterating in_dev->mc_list from bonding driver, its better
to call a helper function provided by igmp.c
Details of implementation (locking) are private to igmp code.

ip_mc_rejoin_group(struct ip_mc_list *im) becomes
ip_mc_rejoin_groups(struct in_device *in_dev);

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-11-18 09:33:19 -08:00 committed by David S. Miller
parent dda0b38692
commit 866f3b25a2
3 changed files with 22 additions and 20 deletions
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8
drivers/net/bonding/bond_main.c
View File

@ -873,15 +873,11 @@ static void bond_mc_del(struct bonding *bond, void *addr)
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(dev);
if (in_dev) {
for (im = in_dev->mc_list; im; im = im->next)
ip_mc_rejoin_group(im);
}
if (in_dev)
ip_mc_rejoin_groups(in_dev);
rcu_read_unlock();
}

2
include/linux/igmp.h
View File

@ -238,7 +238,7 @@ extern void ip_mc_unmap(struct in_device *);
extern void ip_mc_remap(struct in_device *);
extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
extern void ip_mc_rejoin_group(struct ip_mc_list *im);
extern void ip_mc_rejoin_groups(struct in_device *in_dev);
#endif
#endif

32
net/ipv4/igmp.c
View File

@ -1267,26 +1267,32 @@ EXPORT_SYMBOL(ip_mc_inc_group);
/*
* Resend IGMP JOIN report; used for bonding.
* Called with rcu_read_lock()
*/
void ip_mc_rejoin_group(struct ip_mc_list *im)
void ip_mc_rejoin_groups(struct in_device *in_dev)
{
#ifdef CONFIG_IP_MULTICAST
struct in_device *in_dev = im->interface;
struct ip_mc_list *im;
int type;
if (im->multiaddr == IGMP_ALL_HOSTS)
return;
for_each_pmc_rcu(in_dev, im) {
if (im->multiaddr == IGMP_ALL_HOSTS)
continue;
/* a failover is happening and switches
* must be notified immediately */
if (IGMP_V1_SEEN(in_dev))
igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
else if (IGMP_V2_SEEN(in_dev))
igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
else
igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
/* a failover is happening and switches
* must be notified immediately
*/
if (IGMP_V1_SEEN(in_dev))
type = IGMP_HOST_MEMBERSHIP_REPORT;
else if (IGMP_V2_SEEN(in_dev))
type = IGMPV2_HOST_MEMBERSHIP_REPORT;
else
type = IGMPV3_HOST_MEMBERSHIP_REPORT;
igmp_send_report(in_dev, im, type);
}
#endif
}
EXPORT_SYMBOL(ip_mc_rejoin_group);
EXPORT_SYMBOL(ip_mc_rejoin_groups);
/*
* A socket has left a multicast group on device dev