3 files changed, 14 insertions, 0 deletions

diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt
index 1910d097a0ad..dda15886bcb5 100644
--- a/Documentation/networking/dccp.txt
+++ b/Documentation/networking/dccp.txt
@@ -100,6 +100,10 @@ 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 2e8c5ad82793..61dd99c6c2a5 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -617,6 +617,7 @@ enum {
         NET_DCCP_DEFAULT_REQ_RETRIES = 7,
         NET_DCCP_DEFAULT_RETRIES1    = 8,
         NET_DCCP_DEFAULT_RETRIES2    = 9,
+        NET_DCCP_DEFAULT_TX_QLEN     = 10,
 };
 
 /* /proc/sys/net/ipx */
diff --git a/net/dccp/sysctl.c b/net/dccp/sysctl.c
index 8b62061e5701..4775ba3faa04 100644
--- a/net/dccp/sysctl.c
+++ b/net/dccp/sysctl.c
@@ -91,6 +91,15 @@ static struct ctl_table dccp_default_table[] = {
                 .mode           = 0644,
                 .proc_handler   = proc_dointvec,
         },
+        {
+                .ctl_name       = NET_DCCP_DEFAULT_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, }
 };