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-rw-r--r--include/net/inet_hashtables.h85
1 files changed, 42 insertions, 43 deletions
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 5cc182f..f44bb5c 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -41,8 +41,8 @@
* I'll experiment with dynamic table growth later.
*/
struct inet_ehash_bucket {
- struct hlist_head chain;
- struct hlist_head twchain;
+ struct hlist_nulls_head chain;
+ struct hlist_nulls_head twchain;
};
/* There are a few simple rules, which allow for local port reuse by
@@ -77,13 +77,20 @@ struct inet_ehash_bucket {
* ports are created in O(1) time? I thought so. ;-) -DaveM
*/
struct inet_bind_bucket {
+#ifdef CONFIG_NET_NS
struct net *ib_net;
+#endif
unsigned short port;
signed short fastreuse;
struct hlist_node node;
struct hlist_head owners;
};
+static inline struct net *ib_net(struct inet_bind_bucket *ib)
+{
+ return read_pnet(&ib->ib_net);
+}
+
#define inet_bind_bucket_for_each(tb, node, head) \
hlist_for_each_entry(tb, node, head, node)
@@ -92,6 +99,18 @@ struct inet_bind_hashbucket {
struct hlist_head chain;
};
+/*
+ * Sockets can be hashed in established or listening table
+ * We must use different 'nulls' end-of-chain value for listening
+ * hash table, or we might find a socket that was closed and
+ * reallocated/inserted into established hash table
+ */
+#define LISTENING_NULLS_BASE (1U << 29)
+struct inet_listen_hashbucket {
+ spinlock_t lock;
+ struct hlist_nulls_head head;
+};
+
/* This is for listening sockets, thus all sockets which possess wildcards. */
#define INET_LHTABLE_SIZE 32 /* Yes, really, this is all you need. */
@@ -104,7 +123,7 @@ struct inet_hashinfo {
* TIME_WAIT sockets use a separate chain (twchain).
*/
struct inet_ehash_bucket *ehash;
- rwlock_t *ehash_locks;
+ spinlock_t *ehash_locks;
unsigned int ehash_size;
unsigned int ehash_locks_mask;
@@ -116,22 +135,21 @@ struct inet_hashinfo {
unsigned int bhash_size;
/* Note : 4 bytes padding on 64 bit arches */
- /* All sockets in TCP_LISTEN state will be in here. This is the only
- * table where wildcard'd TCP sockets can exist. Hash function here
- * is just local port number.
- */
- struct hlist_head listening_hash[INET_LHTABLE_SIZE];
+ struct kmem_cache *bind_bucket_cachep;
/* All the above members are written once at bootup and
* never written again _or_ are predominantly read-access.
*
* Now align to a new cache line as all the following members
- * are often dirty.
+ * might be often dirty.
*/
- rwlock_t lhash_lock ____cacheline_aligned;
- atomic_t lhash_users;
- wait_queue_head_t lhash_wait;
- struct kmem_cache *bind_bucket_cachep;
+ /* All sockets in TCP_LISTEN state will be in here. This is the only
+ * table where wildcard'd TCP sockets can exist. Hash function here
+ * is just local port number.
+ */
+ struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE]
+ ____cacheline_aligned_in_smp;
+
};
static inline struct inet_ehash_bucket *inet_ehash_bucket(
@@ -141,7 +159,7 @@ static inline struct inet_ehash_bucket *inet_ehash_bucket(
return &hashinfo->ehash[hash & (hashinfo->ehash_size - 1)];
}
-static inline rwlock_t *inet_ehash_lockp(
+static inline spinlock_t *inet_ehash_lockp(
struct inet_hashinfo *hashinfo,
unsigned int hash)
{
@@ -166,16 +184,16 @@ static inline int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
size = 4096;
if (sizeof(rwlock_t) != 0) {
#ifdef CONFIG_NUMA
- if (size * sizeof(rwlock_t) > PAGE_SIZE)
- hashinfo->ehash_locks = vmalloc(size * sizeof(rwlock_t));
+ if (size * sizeof(spinlock_t) > PAGE_SIZE)
+ hashinfo->ehash_locks = vmalloc(size * sizeof(spinlock_t));
else
#endif
- hashinfo->ehash_locks = kmalloc(size * sizeof(rwlock_t),
+ hashinfo->ehash_locks = kmalloc(size * sizeof(spinlock_t),
GFP_KERNEL);
if (!hashinfo->ehash_locks)
return ENOMEM;
for (i = 0; i < size; i++)
- rwlock_init(&hashinfo->ehash_locks[i]);
+ spin_lock_init(&hashinfo->ehash_locks[i]);
}
hashinfo->ehash_locks_mask = size - 1;
return 0;
@@ -186,7 +204,7 @@ static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
if (hashinfo->ehash_locks) {
#ifdef CONFIG_NUMA
unsigned int size = (hashinfo->ehash_locks_mask + 1) *
- sizeof(rwlock_t);
+ sizeof(spinlock_t);
if (size > PAGE_SIZE)
vfree(hashinfo->ehash_locks);
else
@@ -229,26 +247,7 @@ extern void __inet_inherit_port(struct sock *sk, struct sock *child);
extern void inet_put_port(struct sock *sk);
-extern void inet_listen_wlock(struct inet_hashinfo *hashinfo);
-
-/*
- * - We may sleep inside this lock.
- * - If sleeping is not required (or called from BH),
- * use plain read_(un)lock(&inet_hashinfo.lhash_lock).
- */
-static inline void inet_listen_lock(struct inet_hashinfo *hashinfo)
-{
- /* read_lock synchronizes to candidates to writers */
- read_lock(&hashinfo->lhash_lock);
- atomic_inc(&hashinfo->lhash_users);
- read_unlock(&hashinfo->lhash_lock);
-}
-
-static inline void inet_listen_unlock(struct inet_hashinfo *hashinfo)
-{
- if (atomic_dec_and_test(&hashinfo->lhash_users))
- wake_up(&hashinfo->lhash_wait);
-}
+void inet_hashinfo_init(struct inet_hashinfo *h);
extern void __inet_hash_nolisten(struct sock *sk);
extern void inet_hash(struct sock *sk);
@@ -299,25 +298,25 @@ typedef __u64 __bitwise __addrpair;
((__force __u64)(__be32)(__saddr)));
#endif /* __BIG_ENDIAN */
#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
- (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
+ (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
((*((__addrpair *)&(inet_sk(__sk)->daddr))) == (__cookie)) && \
((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#define INET_TW_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
- (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
+ (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
((*((__addrpair *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) && \
((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#else /* 32-bit arch */
#define INET_ADDR_COOKIE(__name, __saddr, __daddr)
#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif) \
- (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
+ (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
(inet_sk(__sk)->daddr == (__saddr)) && \
(inet_sk(__sk)->rcv_saddr == (__daddr)) && \
((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#define INET_TW_MATCH(__sk, __net, __hash,__cookie, __saddr, __daddr, __ports, __dif) \
- (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
+ (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
(inet_twsk(__sk)->tw_daddr == (__saddr)) && \
(inet_twsk(__sk)->tw_rcv_saddr == (__daddr)) && \
((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
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