]> www.pilppa.org Git - linux-2.6-omap-h63xx.git/blobdiff - net/ipv4/tcp_ipv4.c
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6-omap-h63xx.git] / net / ipv4 / tcp_ipv4.c
index 011478e46c406bd7dd75c2b2d06f578714d98606..d13688e3558d1a48728d32e13a38ba09309ec573 100644 (file)
@@ -1364,6 +1364,10 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
        tcp_mtup_init(newsk);
        tcp_sync_mss(newsk, dst_mtu(dst));
        newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
+       if (tcp_sk(sk)->rx_opt.user_mss &&
+           tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
+               newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
+
        tcp_initialize_rcv_mss(newsk);
 
 #ifdef CONFIG_TCP_MD5SIG
@@ -1946,6 +1950,12 @@ static void *listening_get_idx(struct seq_file *seq, loff_t *pos)
        return rc;
 }
 
+static inline int empty_bucket(struct tcp_iter_state *st)
+{
+       return hlist_empty(&tcp_hashinfo.ehash[st->bucket].chain) &&
+               hlist_empty(&tcp_hashinfo.ehash[st->bucket].twchain);
+}
+
 static void *established_get_first(struct seq_file *seq)
 {
        struct tcp_iter_state* st = seq->private;
@@ -1958,6 +1968,10 @@ static void *established_get_first(struct seq_file *seq)
                struct inet_timewait_sock *tw;
                rwlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket);
 
+               /* Lockless fast path for the common case of empty buckets */
+               if (empty_bucket(st))
+                       continue;
+
                read_lock_bh(lock);
                sk_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) {
                        if (sk->sk_family != st->family ||
@@ -2008,13 +2022,15 @@ get_tw:
                read_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket));
                st->state = TCP_SEQ_STATE_ESTABLISHED;
 
-               if (++st->bucket < tcp_hashinfo.ehash_size) {
-                       read_lock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket));
-                       sk = sk_head(&tcp_hashinfo.ehash[st->bucket].chain);
-               } else {
-                       cur = NULL;
-                       goto out;
-               }
+               /* Look for next non empty bucket */
+               while (++st->bucket < tcp_hashinfo.ehash_size &&
+                               empty_bucket(st))
+                       ;
+               if (st->bucket >= tcp_hashinfo.ehash_size)
+                       return NULL;
+
+               read_lock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket));
+               sk = sk_head(&tcp_hashinfo.ehash[st->bucket].chain);
        } else
                sk = sk_next(sk);