[TCP]: Reduce sacked_out with reno when purging write_queue

Previously TCP had a transitional state during which reno
counted segments that are already below the current window into
sacked_out, which is now prevented. In addition, re-try now
the unconditional S+L skb catching.

This approach conservatively calls just remove_sack and leaves
reset_sack() calls alone. The best solution to the whole problem
would be to first calculate the new sacked_out fully (this patch
does not move reno_sack_reset calls from original sites and thus
does not implement this). However, that would require very
invasive change to fastretrans_alert (perhaps even slicing it to
two halves). Alternatively, all callers of tcp_packets_in_flight
(i.e., users that depend on sacked_out) should be postponed
until the new sacked_out has been calculated but it isn't any
simpler alternative.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
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 bf4fc3516fb9..f8af018dd224 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2187,7 +2187,7 @@ static void tcp_mtup_probe_success(struct sock *sk, struct sk_buff *skb)
  * tcp_xmit_retransmit_queue().
  */
 static void
-tcp_fastretrans_alert(struct sock *sk, int prior_packets, int flag)
+tcp_fastretrans_alert(struct sock *sk, int pkts_acked, int flag)
 {
         struct inet_connection_sock *icsk = inet_csk(sk);
         struct tcp_sock *tp = tcp_sk(sk);
@@ -2273,12 +2273,8 @@ tcp_fastretrans_alert(struct sock *sk, int prior_packets, int flag)
                 if (!(flag & FLAG_SND_UNA_ADVANCED)) {
                         if (IsReno(tp) && is_dupack)
                                 tcp_add_reno_sack(sk);
-                } else {
-                        int acked = prior_packets - tp->packets_out;
-                        if (IsReno(tp))
-                                tcp_remove_reno_sacks(sk, acked);
-                        do_lost = tcp_try_undo_partial(sk, acked);
-                }
+                } else
+                        do_lost = tcp_try_undo_partial(sk, pkts_acked);
                 break;
         case TCP_CA_Loss:
                 if (flag&FLAG_DATA_ACKED)
@@ -2577,6 +2573,9 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
                 tcp_ack_update_rtt(sk, acked, seq_rtt);
                 tcp_ack_packets_out(sk);
 
+                if (IsReno(tp))
+                        tcp_remove_reno_sacks(sk, pkts_acked);
+
                 if (ca_ops->pkts_acked) {
                         s32 rtt_us = -1;
 
@@ -2927,7 +2926,7 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
                 if ((flag & FLAG_DATA_ACKED) && !frto_cwnd &&
                     tcp_may_raise_cwnd(sk, flag))
                         tcp_cong_avoid(sk, ack, prior_in_flight, 0);
-                tcp_fastretrans_alert(sk, prior_packets, flag);
+                tcp_fastretrans_alert(sk, prior_packets - tp->packets_out, flag);
         } else {
                 if ((flag & FLAG_DATA_ACKED) && !frto_cwnd)
                         tcp_cong_avoid(sk, ack, prior_in_flight, 1);