tcp: fix cwnd reduction for non-sack recovery

The cwnd reduction in fast recovery is based on the number of packets
newly delivered per ACK. For non-sack connections every DUPACK
signifies a packet has been delivered, but the sender mistakenly
skips counting them for cwnd reduction.

The fix is to compute newly_acked_sacked after DUPACKs are accounted
in sacked_out for non-sack connections.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Nandita Dukkipati <nanditad@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 8 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 85308b90df80..6e38c6c23caa 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2926,13 +2926,14 @@ static void tcp_enter_recovery(struct sock *sk, bool ece_ack)
  * tcp_xmit_retransmit_queue().
  */
 static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked,
-                                  int newly_acked_sacked, bool is_dupack,
+                                  int prior_sacked, bool is_dupack,
                                   int flag)
 {
         struct inet_connection_sock *icsk = inet_csk(sk);
         struct tcp_sock *tp = tcp_sk(sk);
         int do_lost = is_dupack || ((flag & FLAG_DATA_SACKED) &&
                                     (tcp_fackets_out(tp) > tp->reordering));
+        int newly_acked_sacked = 0;
         int fast_rexmit = 0;
 
         if (WARN_ON(!tp->packets_out && tp->sacked_out))
@@ -2992,6 +2993,7 @@ static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked,
                                 tcp_add_reno_sack(sk);
                 } else
                         do_lost = tcp_try_undo_partial(sk, pkts_acked);
+                newly_acked_sacked = pkts_acked + tp->sacked_out - prior_sacked;
                 break;
         case TCP_CA_Loss:
                 if (flag & FLAG_DATA_ACKED)
@@ -3013,6 +3015,7 @@ static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked,
                         if (is_dupack)
                                 tcp_add_reno_sack(sk);
                 }
+                newly_acked_sacked = pkts_acked + tp->sacked_out - prior_sacked;
 
                 if (icsk->icsk_ca_state <= TCP_CA_Disorder)
                         tcp_try_undo_dsack(sk);
@@ -3590,7 +3593,6 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
         int prior_packets;
         int prior_sacked = tp->sacked_out;
         int pkts_acked = 0;
-        int newly_acked_sacked = 0;
         bool frto_cwnd = false;
 
         /* If the ack is older than previous acks
@@ -3666,8 +3668,6 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
         flag |= tcp_clean_rtx_queue(sk, prior_fackets, prior_snd_una);
 
         pkts_acked = prior_packets - tp->packets_out;
-        newly_acked_sacked = (prior_packets - prior_sacked) -
-                             (tp->packets_out - tp->sacked_out);
 
         if (tp->frto_counter)
                 frto_cwnd = tcp_process_frto(sk, flag);
@@ -3681,7 +3681,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
                     tcp_may_raise_cwnd(sk, flag))
                         tcp_cong_avoid(sk, ack, prior_in_flight);
                 is_dupack = !(flag & (FLAG_SND_UNA_ADVANCED | FLAG_NOT_DUP));
-                tcp_fastretrans_alert(sk, pkts_acked, newly_acked_sacked,
+                tcp_fastretrans_alert(sk, pkts_acked, prior_sacked,
                                       is_dupack, flag);
         } else {
                 if ((flag & FLAG_DATA_ACKED) && !frto_cwnd)
@@ -3698,7 +3698,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 no_queue:
         /* If data was DSACKed, see if we can undo a cwnd reduction. */
         if (flag & FLAG_DSACKING_ACK)
-                tcp_fastretrans_alert(sk, pkts_acked, newly_acked_sacked,
+                tcp_fastretrans_alert(sk, pkts_acked, prior_sacked,
                                       is_dupack, flag);
         /* If this ack opens up a zero window, clear backoff.  It was
          * being used to time the probes, and is probably far higher than
@@ -3718,8 +3718,7 @@ old_ack:
          */
         if (TCP_SKB_CB(skb)->sacked) {
                 flag |= tcp_sacktag_write_queue(sk, skb, prior_snd_una);
-                newly_acked_sacked = tp->sacked_out - prior_sacked;
-                tcp_fastretrans_alert(sk, pkts_acked, newly_acked_sacked,
+                tcp_fastretrans_alert(sk, pkts_acked, prior_sacked,
                                       is_dupack, flag);
         }