ipv6: Teach tree walker to skip multipath routes (b5cb5a75) · Commits · 戴 / test

As explained in previous patch, fib6_ifdown() needs to consider the state of all the sibling routes when a multipath route is traversed. This is done by evaluating all the siblings when the first sibling in a multipath route is traversed. If the multipath route does not need to be flushed (e.g., not all siblings are dead), then we should just skip the multipath route as our work is done. Have the tree walker jump to the last sibling when it is determined that the multipath route needs to be skipped. Signed-off-by:

Ido Schimmel <idosch@mellanox.com> Acked-by:

David Ahern <dsahern@gmail.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/ipv6/ip6_fib.c

+9 −2

Original line number	Diff line number	Diff line
		@@ -1887,7 +1887,7 @@ static int fib6_clean_node(struct fib6_walker *w)

		for_each_fib6_walker_rt(w) {
		res = c->func(rt, c->arg);
		if (res < 0) {
		if (res == -1) {
		w->leaf = rt;
		res = fib6_del(rt, &info);
		if (res) {
		@@ -1900,6 +1900,12 @@ static int fib6_clean_node(struct fib6_walker *w)
		continue;
		}
		return 0;
		} else if (res == -2) {
		if (WARN_ON(!rt->rt6i_nsiblings))
		continue;
		rt = list_last_entry(&rt->rt6i_siblings,
		struct rt6_info, rt6i_siblings);
		continue;
		}
		WARN_ON(res != 0);
		}
		@@ -1911,7 +1917,8 @@ static int fib6_clean_node(struct fib6_walker *w)
		* Convenient frontend to tree walker.
		*
		* func is called on each route.
		* It may return -1 -> delete this route.
		* It may return -2 -> skip multipath route.
		* -1 -> delete this route.
		* 0 -> continue walking
		*/

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