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authorArnaldo Carvalho de Melo <acme@ghostprotocols.net>2005-08-09 20:09:46 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 15:42:18 -0700
commite48c414ee61f4ac8d5cff2973e66a7cbc8a93aa5 (patch)
treec4656efe48b75adf5742514c3e4286007f20bdca /include/net/inet_hashtables.h
parent8feaf0c0a5488b3d898a9c207eb6678f44ba3f26 (diff)
[INET]: Generalise the TCP sock ID lookup routines
And also some TIME_WAIT functions. [acme@toy net-2.6.14]$ grep built-in /tmp/before.size /tmp/after.size /tmp/before.size: 282955 13122 9312 305389 4a8ed net/ipv4/built-in.o /tmp/after.size: 281566 13122 9312 304000 4a380 net/ipv4/built-in.o [acme@toy net-2.6.14]$ I kept them still inlined, will uninline at some point to see what would be the performance difference. Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/inet_hashtables.h')
-rw-r--r--include/net/inet_hashtables.h77
1 files changed, 72 insertions, 5 deletions
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index c38c637e0734..b5c0d64ea741 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -30,6 +30,7 @@
#include <net/tcp_states.h>
#include <asm/atomic.h>
+#include <asm/byteorder.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
@@ -285,13 +286,13 @@ extern struct sock *__inet_lookup_listener(const struct hlist_head *head,
const int dif);
/* Optimize the common listener case. */
-static inline struct sock *inet_lookup_listener(struct inet_hashinfo *hashinfo,
- const u32 daddr,
- const unsigned short hnum,
- const int dif)
+static inline struct sock *
+ inet_lookup_listener(struct inet_hashinfo *hashinfo,
+ const u32 daddr,
+ const unsigned short hnum, const int dif)
{
struct sock *sk = NULL;
- struct hlist_head *head;
+ const struct hlist_head *head;
read_lock(&hashinfo->lhash_lock);
head = &hashinfo->listening_hash[inet_lhashfn(hnum)];
@@ -351,4 +352,70 @@ sherry_cache:
((*((__u32 *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#endif /* 64-bit arch */
+
+/*
+ * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
+ * not check it for lookups anymore, thanks Alexey. -DaveM
+ *
+ * Local BH must be disabled here.
+ */
+static inline struct sock *
+ __inet_lookup_established(struct inet_hashinfo *hashinfo,
+ const u32 saddr, const u16 sport,
+ const u32 daddr, const u16 hnum,
+ const int dif)
+{
+ INET_ADDR_COOKIE(acookie, saddr, daddr)
+ const __u32 ports = INET_COMBINED_PORTS(sport, hnum);
+ struct sock *sk;
+ const struct hlist_node *node;
+ /* 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];
+
+ read_lock(&head->lock);
+ sk_for_each(sk, node, &head->chain) {
+ if (INET_MATCH(sk, 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))
+ goto hit;
+ }
+ sk = NULL;
+out:
+ read_unlock(&head->lock);
+ return sk;
+hit:
+ sock_hold(sk);
+ goto out;
+}
+
+static inline struct sock *__inet_lookup(struct inet_hashinfo *hashinfo,
+ const u32 saddr, const u16 sport,
+ const u32 daddr, const u16 hnum,
+ const int dif)
+{
+ struct sock *sk = __inet_lookup_established(hashinfo, saddr, sport, daddr,
+ hnum, dif);
+ return sk ? : inet_lookup_listener(hashinfo, daddr, hnum, dif);
+}
+
+static inline struct sock *inet_lookup(struct inet_hashinfo *hashinfo,
+ const u32 saddr, const u16 sport,
+ const u32 daddr, const u16 dport,
+ const int dif)
+{
+ struct sock *sk;
+
+ local_bh_disable();
+ sk = __inet_lookup(hashinfo, saddr, sport, daddr, ntohs(dport), dif);
+ local_bh_enable();
+
+ return sk;
+}
#endif /* _INET_HASHTABLES_H */