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authorDavid S. Miller <davem@davemloft.net>2008-04-17 23:56:30 -0700
committerDavid S. Miller <davem@davemloft.net>2008-04-17 23:56:30 -0700
commit1e42198609d73ed1a9adcba2af275c24c2678420 (patch)
tree32fd4d9073bfc0f3909af8f9fb4bcff38951d01a /net/ipv4
parent794eb6bf20ebf992c040ea831cd3a9c64b0c1f7a (diff)
parent4b119e21d0c66c22e8ca03df05d9de623d0eb50f (diff)
downloadlinux-1e42198609d73ed1a9adcba2af275c24c2678420.tar.bz2
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/Kconfig8
-rw-r--r--net/ipv4/ipconfig.c2
-rw-r--r--net/ipv4/tcp_input.c78
3 files changed, 57 insertions, 31 deletions
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 9c7e5ffb223d..4670683b4688 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -160,7 +160,7 @@ config IP_PNP_DHCP
If unsure, say Y. Note that if you want to use DHCP, a DHCP server
must be operating on your network. Read
- <file:Documentation/nfsroot.txt> for details.
+ <file:Documentation/filesystems/nfsroot.txt> for details.
config IP_PNP_BOOTP
bool "IP: BOOTP support"
@@ -175,7 +175,7 @@ config IP_PNP_BOOTP
does BOOTP itself, providing all necessary information on the kernel
command line, you can say N here. If unsure, say Y. Note that if you
want to use BOOTP, a BOOTP server must be operating on your network.
- Read <file:Documentation/nfsroot.txt> for details.
+ Read <file:Documentation/filesystems/nfsroot.txt> for details.
config IP_PNP_RARP
bool "IP: RARP support"
@@ -187,8 +187,8 @@ config IP_PNP_RARP
discovered automatically at boot time using the RARP protocol (an
older protocol which is being obsoleted by BOOTP and DHCP), say Y
here. Note that if you want to use RARP, a RARP server must be
- operating on your network. Read <file:Documentation/nfsroot.txt> for
- details.
+ operating on your network. Read
+ <file:Documentation/filesystems/nfsroot.txt> for details.
# not yet ready..
# bool ' IP: ARP support' CONFIG_IP_PNP_ARP
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 0b859d46ea74..0f42d1c1f690 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -1408,7 +1408,7 @@ late_initcall(ip_auto_config);
/*
* Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
- * command line parameter. See Documentation/nfsroot.txt.
+ * command line parameter. See Documentation/filesystems/nfsroot.txt.
*/
static int __init ic_proto_name(char *name)
{
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 1bdb1bd22134..cdc051bfdb4d 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3854,8 +3854,28 @@ static void tcp_ofo_queue(struct sock *sk)
}
}
+static int tcp_prune_ofo_queue(struct sock *sk);
static int tcp_prune_queue(struct sock *sk);
+static inline int tcp_try_rmem_schedule(struct sock *sk, unsigned int size)
+{
+ if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf ||
+ !sk_rmem_schedule(sk, size)) {
+
+ if (tcp_prune_queue(sk) < 0)
+ return -1;
+
+ if (!sk_rmem_schedule(sk, size)) {
+ if (!tcp_prune_ofo_queue(sk))
+ return -1;
+
+ if (!sk_rmem_schedule(sk, size))
+ return -1;
+ }
+ }
+ return 0;
+}
+
static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
{
struct tcphdr *th = tcp_hdr(skb);
@@ -3905,12 +3925,9 @@ static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
if (eaten <= 0) {
queue_and_out:
if (eaten < 0 &&
- (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf ||
- !sk_rmem_schedule(sk, skb->truesize))) {
- if (tcp_prune_queue(sk) < 0 ||
- !sk_rmem_schedule(sk, skb->truesize))
- goto drop;
- }
+ tcp_try_rmem_schedule(sk, skb->truesize))
+ goto drop;
+
skb_set_owner_r(skb, sk);
__skb_queue_tail(&sk->sk_receive_queue, skb);
}
@@ -3979,12 +3996,8 @@ drop:
TCP_ECN_check_ce(tp, skb);
- if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf ||
- !sk_rmem_schedule(sk, skb->truesize)) {
- if (tcp_prune_queue(sk) < 0 ||
- !sk_rmem_schedule(sk, skb->truesize))
- goto drop;
- }
+ if (tcp_try_rmem_schedule(sk, skb->truesize))
+ goto drop;
/* Disable header prediction. */
tp->pred_flags = 0;
@@ -4211,6 +4224,32 @@ static void tcp_collapse_ofo_queue(struct sock *sk)
}
}
+/*
+ * Purge the out-of-order queue.
+ * Return true if queue was pruned.
+ */
+static int tcp_prune_ofo_queue(struct sock *sk)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ int res = 0;
+
+ if (!skb_queue_empty(&tp->out_of_order_queue)) {
+ NET_INC_STATS_BH(LINUX_MIB_OFOPRUNED);
+ __skb_queue_purge(&tp->out_of_order_queue);
+
+ /* Reset SACK state. A conforming SACK implementation will
+ * do the same at a timeout based retransmit. When a connection
+ * is in a sad state like this, we care only about integrity
+ * of the connection not performance.
+ */
+ if (tp->rx_opt.sack_ok)
+ tcp_sack_reset(&tp->rx_opt);
+ sk_mem_reclaim(sk);
+ res = 1;
+ }
+ return res;
+}
+
/* Reduce allocated memory if we can, trying to get
* the socket within its memory limits again.
*
@@ -4244,20 +4283,7 @@ static int tcp_prune_queue(struct sock *sk)
/* Collapsing did not help, destructive actions follow.
* This must not ever occur. */
- /* First, purge the out_of_order queue. */
- if (!skb_queue_empty(&tp->out_of_order_queue)) {
- NET_INC_STATS_BH(LINUX_MIB_OFOPRUNED);
- __skb_queue_purge(&tp->out_of_order_queue);
-
- /* Reset SACK state. A conforming SACK implementation will
- * do the same at a timeout based retransmit. When a connection
- * is in a sad state like this, we care only about integrity
- * of the connection not performance.
- */
- if (tcp_is_sack(tp))
- tcp_sack_reset(&tp->rx_opt);
- sk_mem_reclaim(sk);
- }
+ tcp_prune_ofo_queue(sk);
if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
return 0;