1 files changed, 16 insertions, 0 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 7d2dc015cd19..441ae9da3a23 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2441,6 +2441,20 @@ u32 __tcp_select_window(struct sock *sk)
         return window;
 }
 
+void tcp_skb_collapse_tstamp(struct sk_buff *skb,
+                             const struct sk_buff *next_skb)
+{
+        const struct skb_shared_info *next_shinfo = skb_shinfo(next_skb);
+        u8 tsflags = next_shinfo->tx_flags & SKBTX_ANY_TSTAMP;
+
+        if (unlikely(tsflags)) {
+                struct skb_shared_info *shinfo = skb_shinfo(skb);
+
+                shinfo->tx_flags |= tsflags;
+                shinfo->tskey = next_shinfo->tskey;
+        }
+}
+
 /* Collapses two adjacent SKB's during retransmission. */
 static void tcp_collapse_retrans(struct sock *sk, struct sk_buff *skb)
 {
@@ -2484,6 +2498,8 @@ static void tcp_collapse_retrans(struct sock *sk, struct sk_buff *skb)
 
         tcp_adjust_pcount(sk, next_skb, tcp_skb_pcount(next_skb));
 
+        tcp_skb_collapse_tstamp(skb, next_skb);
+
         sk_wmem_free_skb(sk, next_skb);
 }