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authorRobert Olsson <Robert.Olsson@data.slu.se>2005-08-25 13:01:03 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 16:08:31 -0700
commite5b4376074e02b783e56a8f7c42d544e18112c4e (patch)
tree7269e327d5132da92cd5c7238c03266b7c9f391b
parent3625796806419d97641d90e0f197eab9b952212e (diff)
[IPV4]: Prepare FIB core for RCU.
* RCU versions of hlist_***_rcu * fib_alias partial rcu port just whats needed now. Signed-off-by: Robert Olsson <Robert.Olsson@data.slu.se> Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/list.h21
-rw-r--r--net/ipv4/fib_lookup.h1
-rw-r--r--net/ipv4/fib_semantics.c3
3 files changed, 24 insertions, 1 deletions
diff --git a/include/linux/list.h b/include/linux/list.h
index 0f2435f92db..9b9b0eec1e8 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -634,6 +634,27 @@ static inline void hlist_add_after(struct hlist_node *n,
next->next->pprev = &next->next;
}
+static inline void hlist_add_before_rcu(struct hlist_node *n,
+ struct hlist_node *next)
+{
+ n->pprev = next->pprev;
+ n->next = next;
+ smp_wmb();
+ next->pprev = &n->next;
+ *(n->pprev) = n;
+}
+
+static inline void hlist_add_after_rcu(struct hlist_node *prev,
+ struct hlist_node *n)
+{
+ n->next = prev->next;
+ n->pprev = &prev->next;
+ smp_wmb();
+ prev->next = n;
+ if (n->next)
+ n->next->pprev = &n->next;
+}
+
#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
#define hlist_for_each(pos, head) \
diff --git a/net/ipv4/fib_lookup.h b/net/ipv4/fib_lookup.h
index b729d97cfa9..ef6609ea0eb 100644
--- a/net/ipv4/fib_lookup.h
+++ b/net/ipv4/fib_lookup.h
@@ -7,6 +7,7 @@
struct fib_alias {
struct list_head fa_list;
+ struct rcu_head rcu;
struct fib_info *fa_info;
u8 fa_tos;
u8 fa_type;
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 7e4651b3caa..d41219e8037 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -854,6 +854,7 @@ failure:
return NULL;
}
+/* Note! fib_semantic_match intentionally uses RCU list functions. */
int fib_semantic_match(struct list_head *head, const struct flowi *flp,
struct fib_result *res, __u32 zone, __u32 mask,
int prefixlen)
@@ -861,7 +862,7 @@ int fib_semantic_match(struct list_head *head, const struct flowi *flp,
struct fib_alias *fa;
int nh_sel = 0;
- list_for_each_entry(fa, head, fa_list) {
+ list_for_each_entry_rcu(fa, head, fa_list) {
int err;
if (fa->fa_tos &&