tcp: grow window for OOO packets only for SACK flows

[platform/kernel/linux-starfive.git] / net / ipv4 / tcp_input.c

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 83330a6..12fda8f 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4605,7 +4605,11 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
        if (tcp_ooo_try_coalesce(sk, tp->ooo_last_skb,
                                 skb, &fragstolen)) {
 coalesce_done:
-               tcp_grow_window(sk, skb);
+               /* For non sack flows, do not grow window to force DUPACK
+                * and trigger fast retransmit.
+                */
+               if (tcp_is_sack(tp))
+                       tcp_grow_window(sk, skb);
                kfree_skb_partial(skb, fragstolen);
                skb = NULL;
                goto add_sack;
@@ -4689,7 +4693,11 @@ add_sack:
                tcp_sack_new_ofo_skb(sk, seq, end_seq);
 end:
        if (skb) {
-               tcp_grow_window(sk, skb);
+               /* For non sack flows, do not grow window to force DUPACK
+                * and trigger fast retransmit.
+                */
+               if (tcp_is_sack(tp))
+                       tcp_grow_window(sk, skb);
                skb_condense(skb);
                skb_set_owner_r(skb, sk);
        }