tcp: add tcp_wstamp_ns socket field
TCP will soon provide earliest departure time on TX skbs.
It needs to track this in a new variable.
tcp_mstamp_refresh() needs to update this variable, and
became too big to stay an inline.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index b95aa72..5a8105e 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -45,6 +45,22 @@
#include <trace/events/tcp.h>
+/* Refresh clocks of a TCP socket,
+ * ensuring monotically increasing values.
+ */
+void tcp_mstamp_refresh(struct tcp_sock *tp)
+{
+ u64 val = tcp_clock_ns();
+
+ /* departure time for next data packet */
+ if (val > tp->tcp_wstamp_ns)
+ tp->tcp_wstamp_ns = val;
+
+ val = div_u64(val, NSEC_PER_USEC);
+ if (val > tp->tcp_mstamp)
+ tp->tcp_mstamp = val;
+}
+
static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
int push_one, gfp_t gfp);