diff --git a/include/net/tcp.h b/include/net/tcp.h
index 97b6f5a4df4bd..5b6170fd79748 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1085,6 +1085,9 @@ struct tcp_congestion_ops {
 	/* override sysctl_tcp_min_tso_segs */
 	u32 (*min_tso_segs)(struct sock *sk);
 
+	/* react to a specific lost skb (optional) */
+	void (*skb_marked_lost)(struct sock *sk, const struct sk_buff *skb);
+
 	/* call when packets are delivered to update cwnd and pacing rate,
 	 * after all the ca_state processing. (optional)
 	 */
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index ad75a6d1bfd04..025eeae14512e 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1079,7 +1079,12 @@ static void tcp_verify_retransmit_hint(struct tcp_sock *tp, struct sk_buff *skb)
  */
 static void tcp_notify_skb_loss_event(struct tcp_sock *tp, const struct sk_buff *skb)
 {
+	struct sock *sk = (struct sock *)tp;
+	const struct tcp_congestion_ops *ca_ops = inet_csk(sk)->icsk_ca_ops;
+
 	tp->lost += tcp_skb_pcount(skb);
+	if (ca_ops->skb_marked_lost)
+		ca_ops->skb_marked_lost(sk, skb);
 }
 
 void tcp_mark_skb_lost(struct sock *sk, struct sk_buff *skb)