1 files changed, 38 insertions, 26 deletions

diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 646b6ea7fe26..35f49e65e295 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -108,7 +108,7 @@ struct inet_hashinfo {
         struct inet_bind_hashbucket     *bhash;
 
         int                             bhash_size;
-        int                             ehash_size;
+        unsigned int                    ehash_size;
 
         /* 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
@@ -130,17 +130,16 @@ struct inet_hashinfo {
         int                             port_rover;
 };
 
-static inline int inet_ehashfn(const __u32 laddr, const __u16 lport,
-                               const __u32 faddr, const __u16 fport,
-                               const int ehash_size)
+static inline unsigned int inet_ehashfn(const __u32 laddr, const __u16 lport,
+                               const __u32 faddr, const __u16 fport)
 {
-        int h = (laddr ^ lport) ^ (faddr ^ fport);
+        unsigned int h = (laddr ^ lport) ^ (faddr ^ fport);
         h ^= h >> 16;
         h ^= h >> 8;
-        return h & (ehash_size - 1);
+        return h;
 }
 
-static inline int inet_sk_ehashfn(const struct sock *sk, const int ehash_size)
+static inline int inet_sk_ehashfn(const struct sock *sk)
 {
         const struct inet_sock *inet = inet_sk(sk);
         const __u32 laddr = inet->rcv_saddr;
@@ -148,7 +147,14 @@ static inline int inet_sk_ehashfn(const struct sock *sk, const int ehash_size)
         const __u32 faddr = inet->daddr;
         const __u16 fport = inet->dport;
 
-        return inet_ehashfn(laddr, lport, faddr, fport, ehash_size);
+        return inet_ehashfn(laddr, lport, faddr, fport);
+}
+
+static inline struct inet_ehash_bucket *inet_ehash_bucket(
+        struct inet_hashinfo *hashinfo,
+        unsigned int hash)
+{
+        return &hashinfo->ehash[hash & (hashinfo->ehash_size - 1)];
 }
 
 extern struct inet_bind_bucket *
@@ -235,9 +241,11 @@ static inline void __inet_hash(struct inet_hashinfo *hashinfo,
                 lock = &hashinfo->lhash_lock;
                 inet_listen_wlock(hashinfo);
         } else {
-                sk->sk_hashent = inet_sk_ehashfn(sk, hashinfo->ehash_size);
-                list = &hashinfo->ehash[sk->sk_hashent].chain;
-                lock = &hashinfo->ehash[sk->sk_hashent].lock;
+                struct inet_ehash_bucket *head;
+                sk->sk_hash = inet_sk_ehashfn(sk);
+                head = inet_ehash_bucket(hashinfo, sk->sk_hash);
+                list = &head->chain;
+                lock = &head->lock;
                 write_lock(lock);
         }
         __sk_add_node(sk, list);
@@ -268,9 +276,8 @@ static inline void inet_unhash(struct inet_hashinfo *hashinfo, struct sock *sk)
                 inet_listen_wlock(hashinfo);
                 lock = &hashinfo->lhash_lock;
         } else {
-                struct inet_ehash_bucket *head = &hashinfo->ehash[sk->sk_hashent];
-                lock = &head->lock;
-                write_lock_bh(&head->lock);
+                lock = &inet_ehash_bucket(hashinfo, sk->sk_hash)->lock;
+                write_lock_bh(lock);
         }
 
         if (__sk_del_node_init(sk))
@@ -337,23 +344,27 @@ sherry_cache:
 #define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
         const __u64 __name = (((__u64)(__daddr)) << 32) | ((__u64)(__saddr));
 #endif /* __BIG_ENDIAN */
-#define INET_MATCH(__sk, __cookie, __saddr, __daddr, __ports, __dif)\
-        (((*((__u64 *)&(inet_sk(__sk)->daddr))) == (__cookie))  &&      \
+#define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
+        (((__sk)->sk_hash == (__hash))                          &&      \
+         ((*((__u64 *)&(inet_sk(__sk)->daddr))) == (__cookie))  &&      \
          ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports))   &&      \
          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
-#define INET_TW_MATCH(__sk, __cookie, __saddr, __daddr, __ports, __dif)\
-        (((*((__u64 *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) &&  \
+#define INET_TW_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
+        (((__sk)->sk_hash == (__hash))                          &&      \
+         ((*((__u64 *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) &&  \
          ((*((__u32 *)&(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, __cookie, __saddr, __daddr, __ports, __dif)    \
-        ((inet_sk(__sk)->daddr          == (__saddr))           &&      \
+#define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)    \
+        (((__sk)->sk_hash == (__hash))                          &&      \
+         (inet_sk(__sk)->daddr          == (__saddr))           &&      \
          (inet_sk(__sk)->rcv_saddr      == (__daddr))           &&      \
          ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports))   &&      \
          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
-#define INET_TW_MATCH(__sk, __cookie, __saddr, __daddr, __ports, __dif) \
-        ((inet_twsk(__sk)->tw_daddr     == (__saddr))           &&      \
+#define INET_TW_MATCH(__sk, __hash,__cookie, __saddr, __daddr, __ports, __dif)  \
+        (((__sk)->sk_hash == (__hash))                          &&      \
+         (inet_twsk(__sk)->tw_daddr     == (__saddr))           &&      \
          (inet_twsk(__sk)->tw_rcv_saddr == (__daddr))           &&      \
          ((*((__u32 *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) &&   \
          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
@@ -378,18 +389,19 @@ static inline struct sock *
         /* Optimize here for direct hit, only listening connections can
          * have wildcards anyways.
          */
-        const int hash = inet_ehashfn(daddr, hnum, saddr, sport, hashinfo->ehash_size);
-        struct inet_ehash_bucket *head = &hashinfo->ehash[hash];
+        unsigned int hash = inet_ehashfn(daddr, hnum, saddr, sport);
+        struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash);
 
+        prefetch(head->chain.first);
         read_lock(&head->lock);
         sk_for_each(sk, node, &head->chain) {
-                if (INET_MATCH(sk, acookie, saddr, daddr, ports, dif))
+                if (INET_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
                         goto hit; /* You sunk my battleship! */
         }
 
         /* Must check for a TIME_WAIT'er before going to listener hash. */
         sk_for_each(sk, node, &(head + hashinfo->ehash_size)->chain) {
-                if (INET_TW_MATCH(sk, acookie, saddr, daddr, ports, dif))
+                if (INET_TW_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
                         goto hit;
         }
         sk = NULL;