diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 668e25a76d69..ca6f01531e64 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -223,7 +223,7 @@ struct tcp_sock {
 		fastopen_connect:1, /* FASTOPEN_CONNECT sockopt */
 		fastopen_no_cookie:1, /* Allow send/recv SYN+data without a cookie */
 		is_sack_reneg:1,    /* in recovery from loss with SACK reneg? */
-		unused:2;
+		fastopen_client_fail:2; /* reason why fastopen failed */
 	u8	nonagle     : 4,/* Disable Nagle algorithm?             */
 		thin_lto    : 1,/* Use linear timeouts for thin streams */
 		recvmsg_inq : 1,/* Indicate # of bytes in queue upon recvmsg */
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 81e697978e8b..74af1f759cee 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -155,6 +155,14 @@ enum {
 	TCP_QUEUES_NR,
 };
 
+/* why fastopen failed from client perspective */
+enum tcp_fastopen_client_fail {
+	TFO_STATUS_UNSPEC, /* catch-all */
+	TFO_COOKIE_UNAVAILABLE, /* if not in TFO_CLIENT_NO_COOKIE mode */
+	TFO_DATA_NOT_ACKED, /* SYN-ACK did not ack SYN data */
+	TFO_SYN_RETRANSMITTED, /* SYN-ACK did not ack SYN data after timeout */
+};
+
 /* for TCP_INFO socket option */
 #define TCPI_OPT_TIMESTAMPS	1
 #define TCPI_OPT_SACK		2
@@ -211,7 +219,7 @@ struct tcp_info {
 	__u8	tcpi_backoff;
 	__u8	tcpi_options;
 	__u8	tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
-	__u8	tcpi_delivery_rate_app_limited:1;
+	__u8	tcpi_delivery_rate_app_limited:1, tcpi_fastopen_client_fail:2;
 
 	__u32	tcpi_rto;
 	__u32	tcpi_ato;
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 9d69e1da93f2..8fc1e8b6d408 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2666,6 +2666,7 @@ int tcp_disconnect(struct sock *sk, int flags)
 	/* Clean up fastopen related fields */
 	tcp_free_fastopen_req(tp);
 	inet->defer_connect = 0;
+	tp->fastopen_client_fail = 0;
 
 	WARN_ON(inet->inet_num && !icsk->icsk_bind_hash);
 
@@ -3305,6 +3306,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
 	info->tcpi_reord_seen = tp->reord_seen;
 	info->tcpi_rcv_ooopack = tp->rcv_ooopack;
 	info->tcpi_snd_wnd = tp->snd_wnd;
+	info->tcpi_fastopen_client_fail = tp->fastopen_client_fail;
 	unlock_sock_fast(sk, slow);
 }
 EXPORT_SYMBOL_GPL(tcp_get_info);
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c
index a915ade0c818..19ad9586c720 100644
--- a/net/ipv4/tcp_fastopen.c
+++ b/net/ipv4/tcp_fastopen.c
@@ -422,7 +422,10 @@ bool tcp_fastopen_cookie_check(struct sock *sk, u16 *mss,
 		cookie->len = -1;
 		return true;
 	}
-	return cookie->len > 0;
+	if (cookie->len > 0)
+		return true;
+	tcp_sk(sk)->fastopen_client_fail = TFO_COOKIE_UNAVAILABLE;
+	return false;
 }
 
 /* This function checks if we want to defer sending SYN until the first
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index a2e52ad7cdab..88b987ca9ebb 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5814,6 +5814,10 @@ static bool tcp_rcv_fastopen_synack(struct sock *sk, struct sk_buff *synack,
 	tcp_fastopen_cache_set(sk, mss, cookie, syn_drop, try_exp);
 
 	if (data) { /* Retransmit unacked data in SYN */
+		if (tp->total_retrans)
+			tp->fastopen_client_fail = TFO_SYN_RETRANSMITTED;
+		else
+			tp->fastopen_client_fail = TFO_DATA_NOT_ACKED;
 		skb_rbtree_walk_from(data) {
 			if (__tcp_retransmit_skb(sk, data, 1))
 				break;