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raw: complete rcu conversion

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raw_diag_dump() can use rcu_read_lock() instead of read_lock()

Now the hashinfo lock is only used from process context,
in write mode only, we can convert it to a spinlock,
and we do not need to block BH anymore.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220620100509.3493504-1-eric.dumazet@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet 2022-06-20 03:05:09 -07:00 committed by Paolo Abeni
parent f9aefd6b2a
commit af185d8c76
3 changed files with 8 additions and 8 deletions
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4
include/net/raw.h
View File

@ -32,7 +32,7 @@ int raw_rcv(struct sock *, struct sk_buff *);
#define RAW_HTABLE_SIZE MAX_INET_PROTOS
struct raw_hashinfo {
rwlock_t lock;
spinlock_t lock;
struct hlist_nulls_head ht[RAW_HTABLE_SIZE];
};
@ -40,7 +40,7 @@ static inline void raw_hashinfo_init(struct raw_hashinfo *hashinfo)
{
int i;
rwlock_init(&hashinfo->lock);
spin_lock_init(&hashinfo->lock);
for (i = 0; i < RAW_HTABLE_SIZE; i++)
INIT_HLIST_NULLS_HEAD(&hashinfo->ht[i], i);
}

8
net/ipv4/raw.c
View File

@ -95,10 +95,10 @@ int raw_hash_sk(struct sock *sk)
hlist = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
write_lock_bh(&h->lock);
spin_lock(&h->lock);
__sk_nulls_add_node_rcu(sk, hlist);
sock_set_flag(sk, SOCK_RCU_FREE);
write_unlock_bh(&h->lock);
spin_unlock(&h->lock);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
return 0;
@ -109,10 +109,10 @@ void raw_unhash_sk(struct sock *sk)
{
struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
write_lock_bh(&h->lock);
spin_lock(&h->lock);
if (__sk_nulls_del_node_init_rcu(sk))
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
write_unlock_bh(&h->lock);
spin_unlock(&h->lock);
}
EXPORT_SYMBOL_GPL(raw_unhash_sk);

4
net/ipv4/raw_diag.c
View File

@ -156,7 +156,7 @@ static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
s_slot = cb->args[0];
num = s_num = cb->args[1];
read_lock(&hashinfo->lock);
rcu_read_lock();
for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
num = 0;
@ -184,7 +184,7 @@ next:
}
out_unlock:
read_unlock(&hashinfo->lock);
rcu_read_unlock();
cb->args[0] = slot;
cb->args[1] = num;