tcp: refine tcp_tso_should_defer() after EDT adoption

tcp_tso_should_defer() last step tries to check if the probable
next ACK packet is coming in less than half rtt.

Problem is that the head->tstamp might be in the future,
so we need to use signed arithmetics to avoid overflows.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 35feadf48030..78a56cef7e39 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1907,10 +1907,11 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb,
                                  bool *is_cwnd_limited, u32 max_segs)
 {
         const struct inet_connection_sock *icsk = inet_csk(sk);
-        u32 age, send_win, cong_win, limit, in_flight;
+        u32 send_win, cong_win, limit, in_flight;
         struct tcp_sock *tp = tcp_sk(sk);
         struct sk_buff *head;
         int win_divisor;
+        s64 delta;
 
         if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)
                 goto send_now;
@@ -1972,9 +1973,9 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb,
         head = tcp_rtx_queue_head(sk);
         if (!head)
                 goto send_now;
-        age = tcp_stamp_us_delta(tp->tcp_mstamp, tcp_skb_timestamp_us(head));
+        delta = tp->tcp_clock_cache - head->tstamp;
         /* If next ACK is likely to come too late (half srtt), do not defer */
-        if (age < (tp->srtt_us >> 4))
+        if ((s64)(delta - (u64)NSEC_PER_USEC * (tp->srtt_us >> 4)) < 0)
                 goto send_now;
 
         /* Ok, it looks like it is advisable to defer. */