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inet: Add a count to struct inet_listen_hashbucket

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This patch adds a count to the 'struct inet_listen_hashbucket'.
It counts how many sk is hashed to a bucket.  It will be
used to decide if the (to-be-added) portaddr listener's hashtable
should be used during inet[6]_lookup_listener().

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau 2017-12-01 12:52:29 -08:00 committed by David S. Miller
parent fb7516d424
commit 76d013b20b
2 changed files with 10 additions and 2 deletions
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1
include/net/inet_hashtables.h
View file

@ -111,6 +111,7 @@ struct inet_bind_hashbucket {
*/
struct inet_listen_hashbucket {
spinlock_t lock;
unsigned int count;
struct hlist_head head;
};

11
net/ipv4/inet_hashtables.c
View file

@ -476,6 +476,7 @@ int __inet_hash(struct sock *sk, struct sock *osk)
hlist_add_tail_rcu(&sk->sk_node, &ilb->head);
else
hlist_add_head_rcu(&sk->sk_node, &ilb->head);
ilb->count++;
sock_set_flag(sk, SOCK_RCU_FREE);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
unlock:
@ -502,6 +503,7 @@ EXPORT_SYMBOL_GPL(inet_hash);
void inet_unhash(struct sock *sk)
{
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
struct inet_listen_hashbucket *ilb;
spinlock_t *lock;
bool listener = false;
int done;
@ -510,7 +512,8 @@ void inet_unhash(struct sock *sk)
return;
if (sk->sk_state == TCP_LISTEN) {
lock = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)].lock;
ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
lock = &ilb->lock;
listener = true;
} else {
lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
@ -522,8 +525,11 @@ void inet_unhash(struct sock *sk)
done = __sk_del_node_init(sk);
else
done = __sk_nulls_del_node_init_rcu(sk);
if (done)
if (done) {
if (listener)
ilb->count--;
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
}
spin_unlock_bh(lock);
}
EXPORT_SYMBOL_GPL(inet_unhash);
@ -658,6 +664,7 @@ void inet_hashinfo_init(struct inet_hashinfo *h)
for (i = 0; i < INET_LHTABLE_SIZE; i++) {
spin_lock_init(&h->listening_hash[i].lock);
INIT_HLIST_HEAD(&h->listening_hash[i].head);
h->listening_hash[i].count = 0;
}
}
EXPORT_SYMBOL_GPL(inet_hashinfo_init);