[NET]: prot_inuse cleanups and optimizations

1) Cleanups (all functions are prefixed by sock_prot_inuse)

sock_prot_inc_use(prot) -> sock_prot_inuse_add(prot,-1)
sock_prot_dec_use(prot) -> sock_prot_inuse_add(prot,-1)
sock_prot_inuse()       -> sock_prot_inuse_get()

New functions :

sock_prot_inuse_init() and sock_prot_inuse_free() to abstract pcounter use.

2) if CONFIG_PROC_FS=n, we can zap 'inuse' member from "struct proto",
since nobody wants to read the inuse value.

This saves 1372 bytes on i386/SMP and some cpu cycles.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 57 insertions, 36 deletions

diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 65ddb25d62e8..761bdc01425d 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -293,7 +293,7 @@ static inline void inet_unhash(struct inet_hashinfo *hashinfo, struct sock *sk)
         }
 
         if (__sk_del_node_init(sk))
-                sock_prot_dec_use(sk->sk_prot);
+                sock_prot_inuse_add(sk->sk_prot, -1);
         write_unlock_bh(lock);
 out:
         if (sk->sk_state == TCP_LISTEN)
diff --git a/include/net/sock.h b/include/net/sock.h
index 3d938f6c6725..786fae858e77 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -548,7 +548,9 @@ struct proto {
         int                     (*get_port)(struct sock *sk, unsigned short snum);
 
         /* Keeping track of sockets in use */
+#ifdef CONFIG_PROC_FS
         struct pcounter         inuse;
+#endif
 
         /* Memory pressure */
         void                    (*enter_memory_pressure)(void);
@@ -584,9 +586,6 @@ struct proto {
 #endif
 };
 
-#define DEFINE_PROTO_INUSE(NAME) DEFINE_PCOUNTER(NAME)
-#define REF_PROTO_INUSE(NAME) PCOUNTER_MEMBER_INITIALIZER(NAME, .inuse)
-
 extern int proto_register(struct proto *prot, int alloc_slab);
 extern void proto_unregister(struct proto *prot);
 
@@ -615,21 +614,42 @@ static inline void sk_refcnt_debug_release(const struct sock *sk)
 #define sk_refcnt_debug_release(sk) do { } while (0)
 #endif /* SOCK_REFCNT_DEBUG */
 
+
+#ifdef CONFIG_PROC_FS
+# define DEFINE_PROTO_INUSE(NAME) DEFINE_PCOUNTER(NAME)
+# define REF_PROTO_INUSE(NAME) PCOUNTER_MEMBER_INITIALIZER(NAME, .inuse)
 /* Called with local bh disabled */
-static __inline__ void sock_prot_inc_use(struct proto *prot)
+static inline void sock_prot_inuse_add(struct proto *prot, int inc)
 {
-        pcounter_add(&prot->inuse, 1);
+        pcounter_add(&prot->inuse, inc);
 }
-
-static __inline__ void sock_prot_dec_use(struct proto *prot)
+static inline int sock_prot_inuse_init(struct proto *proto)
 {
-        pcounter_add(&prot->inuse, -1);
+        return pcounter_alloc(&proto->inuse);
 }
-
-static __inline__ int sock_prot_inuse(struct proto *proto)
+static inline int sock_prot_inuse_get(struct proto *proto)
 {
         return pcounter_getval(&proto->inuse);
 }
+static inline void sock_prot_inuse_free(struct proto *proto)
+{
+        pcounter_free(&proto->inuse);
+}
+#else
+# define DEFINE_PROTO_INUSE(NAME)
+# define REF_PROTO_INUSE(NAME)
+static void inline sock_prot_inuse_add(struct proto *prot, int inc)
+{
+}
+static int inline sock_prot_inuse_init(struct proto *proto)
+{
+        return 0;
+}
+static void inline sock_prot_inuse_free(struct proto *proto)
+{
+}
+#endif
+
 
 /* With per-bucket locks this operation is not-atomic, so that
  * this version is not worse.
diff --git a/include/net/udp.h b/include/net/udp.h
index 93796beac8ff..c6669c0a74c7 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -115,7 +115,7 @@ static inline void udp_lib_unhash(struct sock *sk)
         write_lock_bh(&udp_hash_lock);
         if (sk_del_node_init(sk)) {
                 inet_sk(sk)->num = 0;
-                sock_prot_dec_use(sk->sk_prot);
+                sock_prot_inuse_add(sk->sk_prot, -1);
         }
         write_unlock_bh(&udp_hash_lock);
 }
diff --git a/net/core/sock.c b/net/core/sock.c
index 3d7757ee2fc8..1c4b1cd16d65 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1913,7 +1913,7 @@ int proto_register(struct proto *prot, int alloc_slab)
         char *request_sock_slab_name = NULL;
         char *timewait_sock_slab_name;
 
-        if (pcounter_alloc(&prot->inuse) != 0) {
+        if (sock_prot_inuse_init(prot) != 0) {
                 printk(KERN_CRIT "%s: Can't alloc inuse counters!\n", prot->name);
                 goto out;
         }
@@ -1984,7 +1984,7 @@ out_free_sock_slab:
         kmem_cache_destroy(prot->slab);
         prot->slab = NULL;
 out_free_inuse:
-        pcounter_free(&prot->inuse);
+        sock_prot_inuse_free(prot);
 out:
         return -ENOBUFS;
 }
@@ -1997,7 +1997,7 @@ void proto_unregister(struct proto *prot)
         list_del(&prot->node);
         write_unlock(&proto_list_lock);
 
-        pcounter_free(&prot->inuse);
+        sock_prot_inuse_free(prot);
 
         if (prot->slab != NULL) {
                 kmem_cache_destroy(prot->slab);
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 88a059e04e30..619c63c6948a 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -278,7 +278,7 @@ unique:
         sk->sk_hash = hash;
         BUG_TRAP(sk_unhashed(sk));
         __sk_add_node(sk, &head->chain);
-        sock_prot_inc_use(sk->sk_prot);
+        sock_prot_inuse_add(sk->sk_prot, 1);
         write_unlock(lock);
 
         if (twp) {
@@ -321,7 +321,7 @@ void __inet_hash_nolisten(struct inet_hashinfo *hashinfo, struct sock *sk)
 
         write_lock(lock);
         __sk_add_node(sk, list);
-        sock_prot_inc_use(sk->sk_prot);
+        sock_prot_inuse_add(sk->sk_prot, 1);
         write_unlock(lock);
 }
 EXPORT_SYMBOL_GPL(__inet_hash_nolisten);
@@ -342,7 +342,7 @@ void __inet_hash(struct inet_hashinfo *hashinfo, struct sock *sk)
 
         inet_listen_wlock(hashinfo);
         __sk_add_node(sk, list);
-        sock_prot_inc_use(sk->sk_prot);
+        sock_prot_inuse_add(sk->sk_prot, 1);
         write_unlock(lock);
         wake_up(&hashinfo->lhash_wait);
 }
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 1b7db4208969..876169f3a528 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -91,7 +91,7 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
 
         /* Step 2: Remove SK from established hash. */
         if (__sk_del_node_init(sk))
-                sock_prot_dec_use(sk->sk_prot);
+                sock_prot_inuse_add(sk->sk_prot, -1);
 
         /* Step 3: Hash TW into TIMEWAIT chain. */
         inet_twsk_add_node(tw, &ehead->twchain);
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 53bc010beefd..cb3787fbeb90 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -53,13 +53,14 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
 {
         socket_seq_show(seq);
         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
-                   sock_prot_inuse(&tcp_prot), atomic_read(&tcp_orphan_count),
+                   sock_prot_inuse_get(&tcp_prot),
+                   atomic_read(&tcp_orphan_count),
                    tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
                    atomic_read(&tcp_memory_allocated));
-        seq_printf(seq, "UDP: inuse %d mem %d\n", sock_prot_inuse(&udp_prot),
+        seq_printf(seq, "UDP: inuse %d mem %d\n", sock_prot_inuse_get(&udp_prot),
                    atomic_read(&udp_memory_allocated));
-        seq_printf(seq, "UDPLITE: inuse %d\n", sock_prot_inuse(&udplite_prot));
-        seq_printf(seq, "RAW: inuse %d\n", sock_prot_inuse(&raw_prot));
+        seq_printf(seq, "UDPLITE: inuse %d\n", sock_prot_inuse_get(&udplite_prot));
+        seq_printf(seq, "RAW: inuse %d\n", sock_prot_inuse_get(&raw_prot));
         seq_printf(seq,  "FRAG: inuse %d memory %d\n",
                         ip_frag_nqueues(), ip_frag_mem());
         return 0;
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 5aec5a5e5f16..e811034b1b01 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -92,7 +92,7 @@ void raw_hash_sk(struct sock *sk, struct raw_hashinfo *h)
 
         write_lock_bh(&h->lock);
         sk_add_node(sk, head);
-        sock_prot_inc_use(sk->sk_prot);
+        sock_prot_inuse_add(sk->sk_prot, 1);
         write_unlock_bh(&h->lock);
 }
 EXPORT_SYMBOL_GPL(raw_hash_sk);
@@ -101,7 +101,7 @@ void raw_unhash_sk(struct sock *sk, struct raw_hashinfo *h)
 {
         write_lock_bh(&h->lock);
         if (sk_del_node_init(sk))
-                sock_prot_dec_use(sk->sk_prot);
+                sock_prot_inuse_add(sk->sk_prot, -1);
         write_unlock_bh(&h->lock);
 }
 EXPORT_SYMBOL_GPL(raw_unhash_sk);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 02fcccd0486e..cb2411cb87da 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -230,7 +230,7 @@ gotit:
         if (sk_unhashed(sk)) {
                 head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
                 sk_add_node(sk, head);
-                sock_prot_inc_use(sk->sk_prot);
+                sock_prot_inuse_add(sk->sk_prot, 1);
         }
         error = 0;
 fail:
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 0765d8bd380f..a66a7d8e2811 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -43,7 +43,7 @@ void __inet6_hash(struct inet_hashinfo *hashinfo,
         }
 
         __sk_add_node(sk, list);
-        sock_prot_inc_use(sk->sk_prot);
+        sock_prot_inuse_add(sk->sk_prot, 1);
         write_unlock(lock);
 }
 EXPORT_SYMBOL(__inet6_hash);
@@ -216,7 +216,7 @@ unique:
         BUG_TRAP(sk_unhashed(sk));
         __sk_add_node(sk, &head->chain);
         sk->sk_hash = hash;
-        sock_prot_inc_use(sk->sk_prot);
+        sock_prot_inuse_add(sk->sk_prot, 1);
         write_unlock(lock);
 
         if (twp != NULL) {
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 20fece4ad3d8..bf2a686aa13d 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -268,8 +268,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                                 struct inet_connection_sock *icsk = inet_csk(sk);
 
                                 local_bh_disable();
-                                sock_prot_dec_use(sk->sk_prot);
-                                sock_prot_inc_use(&tcp_prot);
+                                sock_prot_inuse_add(sk->sk_prot, -1);
+                                sock_prot_inuse_add(&tcp_prot, 1);
                                 local_bh_enable();
                                 sk->sk_prot = &tcp_prot;
                                 icsk->icsk_af_ops = &ipv4_specific;
@@ -282,8 +282,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
                                         prot = &udplite_prot;
                                 local_bh_disable();
-                                sock_prot_dec_use(sk->sk_prot);
-                                sock_prot_inc_use(prot);
+                                sock_prot_inuse_add(sk->sk_prot, -1);
+                                sock_prot_inuse_add(prot, 1);
                                 local_bh_enable();
                                 sk->sk_prot = prot;
                                 sk->sk_socket->ops = &inet_dgram_ops;
diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index 41e9980b3e0e..571d95a21c15 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -36,13 +36,13 @@ static struct proc_dir_entry *proc_net_devsnmp6;
 static int sockstat6_seq_show(struct seq_file *seq, void *v)
 {
         seq_printf(seq, "TCP6: inuse %d\n",
-                       sock_prot_inuse(&tcpv6_prot));
+                       sock_prot_inuse_get(&tcpv6_prot));
         seq_printf(seq, "UDP6: inuse %d\n",
-                       sock_prot_inuse(&udpv6_prot));
+                       sock_prot_inuse_get(&udpv6_prot));
         seq_printf(seq, "UDPLITE6: inuse %d\n",
-                        sock_prot_inuse(&udplitev6_prot));
+                        sock_prot_inuse_get(&udplitev6_prot));
         seq_printf(seq, "RAW6: inuse %d\n",
-                       sock_prot_inuse(&rawv6_prot));
+                       sock_prot_inuse_get(&rawv6_prot));
         seq_printf(seq, "FRAG6: inuse %d memory %d\n",
                        ip6_frag_nqueues(), ip6_frag_mem());
         return 0;