This implements tx buffer sysctls for DCCP.
Signed-off-by: Ian McDonald <ian.mcdonald@xxxxxxxxxxx>
---
diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt
index c2328c8..b452ff8 100644
--- a/Documentation/networking/dccp.txt
+++ b/Documentation/networking/dccp.txt
@@ -104,6 +104,10 @@ rx_ccid = 2
seq_window = 100
The initial sequence window (sec. 7.5.2).
+tx_qlen = 5
+ The size of the transmit buffer in packets. A value of 0 corresponds
+ to an unbounded transmit buffer.
+
Notes
=====
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index d98562f..4db45ec 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -612,6 +612,7 @@ enum {
NET_DCCP_DEFAULT_ACK_RATIO = 4,
NET_DCCP_DEFAULT_SEND_ACKVEC = 5,
NET_DCCP_DEFAULT_SEND_NDP = 6,
+ NET_DCCP_TX_QLEN = 10,
};
/* /proc/sys/net/ipx */
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 6e557d8..ff2b77d 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -61,6 +61,10 @@ extern void dccp_time_wait(struct sock *
#define DCCP_XMIT_TIMEO 30000
/* Time in msecs for blocking transmit per packet */
+#define DCCP_DEFAULT_TX_QLEN 5
+
+extern int sysctl_dccp_tx_qlen;
+
/* is seq1 < seq2 ? */
static inline int before48(const u64 seq1, const u64 seq2)
{
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 72cbdcf..2729fdc 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -52,6 +52,9 @@ struct inet_hashinfo __cacheline_aligned
EXPORT_SYMBOL_GPL(dccp_hashinfo);
+/* the maximum queue length for tx in packets. 0 is no limit */
+int sysctl_dccp_tx_qlen;
+
void dccp_set_state(struct sock *sk, const int state)
{
const int oldstate = sk->sk_state;
@@ -1040,6 +1043,8 @@ static int __init dccp_init(void)
INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain);
}
+ sysctl_dccp_tx_qlen = DCCP_DEFAULT_TX_QLEN;
+
rc = dccp_mib_init();
if (rc)
goto out_free_dccp_bhash;
diff --git a/net/dccp/sysctl.c b/net/dccp/sysctl.c
index 38bc157..8aa8f30 100644
--- a/net/dccp/sysctl.c
+++ b/net/dccp/sysctl.c
@@ -11,6 +11,7 @@
#include <linux/mm.h>
#include <linux/sysctl.h>
+#include "dccp.h"
#include "feat.h"
#ifndef CONFIG_SYSCTL
@@ -66,6 +67,15 @@ static struct ctl_table dccp_default_tab
.mode = 0644,
.proc_handler = proc_dointvec,
},
+ {
+ .ctl_name = NET_DCCP_TX_QLEN,
+ .procname = "tx_qlen",
+ .data = &sysctl_dccp_tx_qlen,
+ .maxlen = sizeof(sysctl_dccp_tx_qlen),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+
{ .ctl_name = 0, }
};
-
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