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ipv6: fib: Add helpers to hold / drop a reference on rt6_info 

Similar to commit 1c677b3d28 ("ipv4: fib: Add fib_info_hold() helper")
and commit b423cb1080 ("ipv4: fib: Export free_fib_info()") add an
helper to hold a reference on rt6_info and export rt6_release() to drop
it and potentially release the route.

This is needed so that drivers capable of FIB offload could hold a
reference on the route before queueing it for offload and drop it after
the route has been programmed to the device's tables.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2017-08-03 13:28:25 +02:00 committed by David S. Miller
parent fc882fcff1
commit a460aa8396
2 changed files with 18 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/net/ip6_fib.h
View File

@ -187,6 +187,22 @@ static inline void ip6_rt_put(struct rt6_info *rt)
dst_release(&rt->dst);
}
void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);
static inline void rt6_hold(struct rt6_info *rt)
{
atomic_inc(&rt->rt6i_ref);
}
static inline void rt6_release(struct rt6_info *rt)
{
if (atomic_dec_and_test(&rt->rt6i_ref)) {
rt6_free_pcpu(rt);
dst_dev_put(&rt->dst);
dst_release(&rt->dst);
}
}
enum fib6_walk_state {
#ifdef CONFIG_IPV6_SUBTREES
FWS_S,

12
net/ipv6/ip6_fib.c
View File

@ -154,7 +154,7 @@ static void node_free(struct fib6_node *fn)
kmem_cache_free(fib6_node_kmem, fn);
}
static void rt6_free_pcpu(struct rt6_info *non_pcpu_rt)
void rt6_free_pcpu(struct rt6_info *non_pcpu_rt)
{
int cpu;
@ -177,15 +177,7 @@ static void rt6_free_pcpu(struct rt6_info *non_pcpu_rt)
free_percpu(non_pcpu_rt->rt6i_pcpu);
non_pcpu_rt->rt6i_pcpu = NULL;
}
static void rt6_release(struct rt6_info *rt)
{
if (atomic_dec_and_test(&rt->rt6i_ref)) {
rt6_free_pcpu(rt);
dst_dev_put(&rt->dst);
dst_release(&rt->dst);
}
}
EXPORT_SYMBOL_GPL(rt6_free_pcpu);
static void fib6_link_table(struct net *net, struct fib6_table *tb)
{