tcp: invoke pkts_acked hook on every ACK

Invoking pkts_acked is currently conditioned on FLAG_ACKED:
receiving a cumulative ACK of new data, or ACK with SYN flag set.

Remove this condition so that CC may get RTT measurements from all SACKs.

Cc: Yuchung Cheng <ycheng@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Kenneth Klette Jonassen <kennetkl@ifi.uio.no>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index f563d2a..09bdc4a 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3159,9 +3159,6 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
        rtt_update = tcp_ack_update_rtt(sk, flag, seq_rtt_us, sack_rtt_us);
 
        if (flag & FLAG_ACKED) {
-               const struct tcp_congestion_ops *ca_ops
-                       = inet_csk(sk)->icsk_ca_ops;
-
                tcp_rearm_rto(sk);
                if (unlikely(icsk->icsk_mtup.probe_size &&
                             !after(tp->mtu_probe.probe_seq_end, tp->snd_una))) {
@@ -3184,9 +3181,6 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
 
                tp->fackets_out -= min(pkts_acked, tp->fackets_out);
 
-               if (ca_ops->pkts_acked)
-                       ca_ops->pkts_acked(sk, pkts_acked, ca_rtt_us);
-
        } else if (skb && rtt_update && sack_rtt_us >= 0 &&
                   sack_rtt_us > skb_mstamp_us_delta(&now, &skb->skb_mstamp)) {
                /* Do not re-arm RTO if the sack RTT is measured from data sent
@@ -3196,6 +3190,9 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
                tcp_rearm_rto(sk);
        }
 
+       if (icsk->icsk_ca_ops->pkts_acked)
+               icsk->icsk_ca_ops->pkts_acked(sk, pkts_acked, ca_rtt_us);
+
 #if FASTRETRANS_DEBUG > 0
        WARN_ON((int)tp->sacked_out < 0);
        WARN_ON((int)tp->lost_out < 0);