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Commit a460aa83 authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

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



Similar to commit 1c677b3d ("ipv4: fib: Add fib_info_hold() helper")
and commit b423cb10 ("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: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fc882fcf

include/net/ip6_fib.h

+16 −0
Original line number Diff line number Diff line
@@ -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,

net/ipv6/ip6_fib.c

+2 −10
Original line number Diff line number Diff line
@@ -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)

{