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mld: convert ip6_sf_list to RCU

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The ip6_sf_list has been protected by mca_lock(spin_lock) so that the
critical section is atomic context. In order to switch this context,
changing locking is needed. The ip6_sf_list actually already protected
by RTNL So if it's converted to use RCU, its control path context can
be switched to sleepable.
But It doesn't remove mca_lock yet because ifmcaddr6 isn't converted
to RCU yet. So, It's not fully converted to the sleepable context.

Suggested-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Taehee Yoo
2021-03-25 16:16:54 +00:00
committed by David S. Miller
parent 882ba1f73c
commit 4b200e3989
2 changed files with 130 additions and 77 deletions
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7
include/net/if_inet6.h
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@@ -97,12 +97,13 @@ struct ipv6_mc_socklist {
};
struct ip6_sf_list {
struct ip6_sf_list *sf_next;
struct ip6_sf_list __rcu *sf_next;
struct in6_addr sf_addr;
unsigned long sf_count[2]; /* include/exclude counts */
unsigned char sf_gsresp; /* include in g & s response? */
unsigned char sf_oldin; /* change state */
unsigned char sf_crcount; /* retrans. left to send */
struct rcu_head rcu;
};
#define MAF_TIMER_RUNNING 0x01
@@ -115,8 +116,8 @@ struct ifmcaddr6 {
struct in6_addr mca_addr;
struct inet6_dev *idev;
struct ifmcaddr6 *next;
struct ip6_sf_list *mca_sources;
struct ip6_sf_list *mca_tomb;
struct ip6_sf_list __rcu *mca_sources;
struct ip6_sf_list __rcu *mca_tomb;
unsigned int mca_sfmode;
unsigned char mca_crcount;
unsigned long mca_sfcount[2];