WLAN subsystem: Sysctl support for key TCP/IP parameters

It has been observed that default values for some of key tcp/ip
parameters are affecting the tput/performance of the system. Hence
extending configuration capabilities to TCP/Ip stack through
sysctl interface

Change-Id: I4287e9103769535f43e0934bac08435a524ee6a4
CRs-Fixed: 507581
Signed-off-by: Ravi Joshi <ravij@codeaurora.org>
Signed-off-by: Ganesh Babu Kumaravel <kganesh@codeaurora.org>
Signed-off-by: Mohit Khanna <mkhannaqca@codeaurora.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 193ba1fa8a9a..ce20968de667 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -32,6 +32,40 @@ int sysctl_tcp_retries2 __read_mostly = TCP_RETR2;
 int sysctl_tcp_orphan_retries __read_mostly;
 int sysctl_tcp_thin_linear_timeouts __read_mostly;
 
+/*Function to reset tcp_ack related sysctl on resetting master control */
+void set_tcp_default(void)
+{
+	sysctl_tcp_delack_seg	= TCP_DELACK_SEG;
+}
+
+/*sysctl handler for tcp_ack realted master control */
+int tcp_proc_delayed_ack_control(struct ctl_table *table, int write,
+				 void __user *buffer, size_t *length,
+				 loff_t *ppos)
+{
+	int ret = proc_dointvec_minmax(table, write, buffer, length, ppos);
+
+	/* The ret value will be 0 if the input validation is successful
+	 * and the values are written to sysctl table. If not, the stack
+	 * will continue to work with currently configured values
+	 */
+	return ret;
+}
+
+/*sysctl handler for tcp_ack realted master control */
+int tcp_use_userconfig_sysctl_handler(struct ctl_table *table, int write,
+				      void __user *buffer, size_t *length,
+				      loff_t *ppos)
+{
+	int ret = proc_dointvec_minmax(table, write, buffer, length, ppos);
+
+	if (write && ret == 0) {
+		if (!sysctl_tcp_use_userconfig)
+			set_tcp_default();
+	}
+	return ret;
+}
+
 static void tcp_write_err(struct sock *sk)
 {
 	sk->sk_err = sk->sk_err_soft ? : ETIMEDOUT;