[INET]: Move the TCP hashtable functions/structs to inet_hashtables.[ch]

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 118 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6c9f6f7cab5c..ff5d30ac2b06 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -30,6 +30,7 @@
 #include <linux/slab.h>
 #include <linux/cache.h>
 #include <linux/percpu.h>
+#include <net/inet_hashtables.h>
 #include <net/checksum.h>
 #include <net/request_sock.h>
 #include <net/sock.h>
@@ -40,101 +41,6 @@
 #endif
 #include <linux/seq_file.h>
 
-/* This is for all connections with a full identity, no wildcards.
- * New scheme, half the table is for TIME_WAIT, the other half is
- * for the rest.  I'll experiment with dynamic table growth later.
- */
-struct inet_ehash_bucket {
-	rwlock_t	  lock;
-	struct hlist_head chain;
-} __attribute__((__aligned__(8)));
-
-/* This is for listening sockets, thus all sockets which possess wildcards. */
-#define INET_LHTABLE_SIZE	32	/* Yes, really, this is all you need. */
-
-/* There are a few simple rules, which allow for local port reuse by
- * an application.  In essence:
- *
- *	1) Sockets bound to different interfaces may share a local port.
- *	   Failing that, goto test 2.
- *	2) If all sockets have sk->sk_reuse set, and none of them are in
- *	   TCP_LISTEN state, the port may be shared.
- *	   Failing that, goto test 3.
- *	3) If all sockets are bound to a specific inet_sk(sk)->rcv_saddr local
- *	   address, and none of them are the same, the port may be
- *	   shared.
- *	   Failing this, the port cannot be shared.
- *
- * The interesting point, is test #2.  This is what an FTP server does
- * all day.  To optimize this case we use a specific flag bit defined
- * below.  As we add sockets to a bind bucket list, we perform a
- * check of: (newsk->sk_reuse && (newsk->sk_state != TCP_LISTEN))
- * As long as all sockets added to a bind bucket pass this test,
- * the flag bit will be set.
- * The resulting situation is that tcp_v[46]_verify_bind() can just check
- * for this flag bit, if it is set and the socket trying to bind has
- * sk->sk_reuse set, we don't even have to walk the owners list at all,
- * we return that it is ok to bind this socket to the requested local port.
- *
- * Sounds like a lot of work, but it is worth it.  In a more naive
- * implementation (ie. current FreeBSD etc.) the entire list of ports
- * must be walked for each data port opened by an ftp server.  Needless
- * to say, this does not scale at all.  With a couple thousand FTP
- * users logged onto your box, isn't it nice to know that new data
- * ports are created in O(1) time?  I thought so. ;-)	-DaveM
- */
-struct inet_bind_bucket {
-	unsigned short		port;
-	signed short		fastreuse;
-	struct hlist_node	node;
-	struct hlist_head	owners;
-};
-
-#define inet_bind_bucket_for_each(tb, node, head) \
-	hlist_for_each_entry(tb, node, head, node)
-
-struct inet_bind_hashbucket {
-	spinlock_t		lock;
-	struct hlist_head	chain;
-};
-
-struct inet_hashinfo {
-	/* This is for sockets with full identity only.  Sockets here will
-	 * always be without wildcards and will have the following invariant:
-	 *
-	 *          TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
-	 *
-	 * First half of the table is for sockets not in TIME_WAIT, second half
-	 * is for TIME_WAIT sockets only.
-	 */
-	struct inet_ehash_bucket	*ehash;
-
-	/* Ok, let's try this, I give up, we do need a local binding
-	 * TCP hash as well as the others for fast bind/connect.
-	 */
-	struct inet_bind_hashbucket	*bhash;
-
-	int				bhash_size;
-	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
-	 * is just local port number.
-	 */
-	struct hlist_head		listening_hash[INET_LHTABLE_SIZE];
-
-	/* 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.
-	 */
-	rwlock_t			lhash_lock ____cacheline_aligned;
-	atomic_t			lhash_users;
-	wait_queue_head_t		lhash_wait;
-	spinlock_t			portalloc_lock;
-};
-
 extern struct inet_hashinfo	tcp_hashinfo;
 #define tcp_ehash		(tcp_hashinfo.ehash)
 #define tcp_bhash		(tcp_hashinfo.bhash)
@@ -147,19 +53,8 @@ extern struct inet_hashinfo	tcp_hashinfo;
 #define tcp_portalloc_lock	(tcp_hashinfo.portalloc_lock)
 
 extern kmem_cache_t *tcp_bucket_cachep;
-extern struct inet_bind_bucket *
-	    inet_bind_bucket_create(kmem_cache_t *cachep,
-				    struct inet_bind_hashbucket *head,
-				    const unsigned short snum);
-extern void inet_bind_bucket_destroy(kmem_cache_t *cachep,
-				     struct inet_bind_bucket *tb);
-extern int tcp_port_rover;
 
-/* These are AF independent. */
-static inline int inet_bhashfn(const __u16 lport, const int bhash_size)
-{
-	return lport & (bhash_size - 1);
-}
+extern int tcp_port_rover;
 
 extern void tcp_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
 			  unsigned short snum);
@@ -359,17 +254,6 @@ extern void tcp_tw_deschedule(struct tcp_tw_bucket *tw);
 	 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr))	&& \
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 
-/* These can have wildcards, don't try too hard. */
-static inline int inet_lhashfn(const unsigned short num)
-{
-	return num & (INET_LHTABLE_SIZE - 1);
-}
-
-static inline int inet_sk_listen_hashfn(const struct sock *sk)
-{
-	return inet_lhashfn(inet_sk(sk)->num);
-}
-
 #define MAX_TCP_HEADER	(128 + MAX_HEADER)
 
 /*