Commit e5b43760 authored by Robert Olsson's avatar Robert Olsson Committed by David S. Miller
Browse files

[IPV4]: Prepare FIB core for RCU. 



* RCU versions of hlist_***_rcu
* fib_alias partial rcu port just whats needed now.

Signed-off-by: default avatarRobert Olsson <Robert.Olsson@data.slu.se>
Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 36257968

include/linux/list.h

+21 −0
Original line number Diff line number Diff line
@@ -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) \

net/ipv4/fib_lookup.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

net/ipv4/fib_semantics.c

+2 −1
Original line number Diff line number Diff line
@@ -854,6 +854,7 @@ fib_create_info(const struct rtmsg *r, struct kern_rta *rta, 
	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 &&