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ipv4: add (struct uncached_list)->quarantine list
This is an optimization to keep the per-cpu lists as short as possible: Whenever rt_flush_dev() changes one rtable dst.dev matching the disappearing device, it can can transfer the object to a quarantine list, waiting for a final rt_del_uncached_list(). Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 9 additions and 3 deletions
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@ -1485,6 +1485,7 @@ static bool rt_cache_route(struct fib_nh_common *nhc, struct rtable *rt)
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struct uncached_list {
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spinlock_t lock;
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struct list_head head;
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struct list_head quarantine;
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};
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static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt_uncached_list);
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@ -1506,7 +1507,7 @@ void rt_del_uncached_list(struct rtable *rt)
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struct uncached_list *ul = rt->rt_uncached_list;
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spin_lock_bh(&ul->lock);
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list_del(&rt->rt_uncached);
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list_del_init(&rt->rt_uncached);
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spin_unlock_bh(&ul->lock);
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}
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}
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@ -1521,20 +1522,24 @@ static void ipv4_dst_destroy(struct dst_entry *dst)
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void rt_flush_dev(struct net_device *dev)
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{
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struct rtable *rt;
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struct rtable *rt, *safe;
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int cpu;
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for_each_possible_cpu(cpu) {
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struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu);
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if (list_empty(&ul->head))
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continue;
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spin_lock_bh(&ul->lock);
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list_for_each_entry(rt, &ul->head, rt_uncached) {
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list_for_each_entry_safe(rt, safe, &ul->head, rt_uncached) {
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if (rt->dst.dev != dev)
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continue;
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rt->dst.dev = blackhole_netdev;
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dev_replace_track(dev, blackhole_netdev,
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&rt->dst.dev_tracker,
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GFP_ATOMIC);
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list_move(&rt->rt_uncached, &ul->quarantine);
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}
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spin_unlock_bh(&ul->lock);
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}
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@ -3706,6 +3711,7 @@ int __init ip_rt_init(void)
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struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu);
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INIT_LIST_HEAD(&ul->head);
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INIT_LIST_HEAD(&ul->quarantine);
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spin_lock_init(&ul->lock);
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}
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#ifdef CONFIG_IP_ROUTE_CLASSID
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