tcp: add ece_ack flag to reno sack functions
Pass a boolean flag that tells the ECE state of the current ack to reno sack functions. This is pure refactor for future patches to improve tracking delivered counts. Signed-off-by: Yousuk Seung <ysseung@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1893,7 +1893,7 @@ static void tcp_check_reno_reordering(struct sock *sk, const int addend)
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/* Emulate SACKs for SACKless connection: account for a new dupack. */
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static void tcp_add_reno_sack(struct sock *sk, int num_dupack)
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static void tcp_add_reno_sack(struct sock *sk, int num_dupack, bool ece_ack)
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{
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if (num_dupack) {
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struct tcp_sock *tp = tcp_sk(sk);
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@ -1911,7 +1911,7 @@ static void tcp_add_reno_sack(struct sock *sk, int num_dupack)
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/* Account for ACK, ACKing some data in Reno Recovery phase. */
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static void tcp_remove_reno_sacks(struct sock *sk, int acked)
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static void tcp_remove_reno_sacks(struct sock *sk, int acked, bool ece_ack)
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{
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struct tcp_sock *tp = tcp_sk(sk);
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@ -2697,7 +2697,7 @@ static void tcp_process_loss(struct sock *sk, int flag, int num_dupack,
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* delivered. Lower inflight to clock out (re)tranmissions.
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*/
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if (after(tp->snd_nxt, tp->high_seq) && num_dupack)
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tcp_add_reno_sack(sk, num_dupack);
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tcp_add_reno_sack(sk, num_dupack, flag & FLAG_ECE);
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else if (flag & FLAG_SND_UNA_ADVANCED)
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tcp_reset_reno_sack(tp);
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}
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@ -2779,6 +2779,7 @@ static void tcp_fastretrans_alert(struct sock *sk, const u32 prior_snd_una,
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct tcp_sock *tp = tcp_sk(sk);
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int fast_rexmit = 0, flag = *ack_flag;
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bool ece_ack = flag & FLAG_ECE;
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bool do_lost = num_dupack || ((flag & FLAG_DATA_SACKED) &&
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tcp_force_fast_retransmit(sk));
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@ -2787,7 +2788,7 @@ static void tcp_fastretrans_alert(struct sock *sk, const u32 prior_snd_una,
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/* Now state machine starts.
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* A. ECE, hence prohibit cwnd undoing, the reduction is required. */
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if (flag & FLAG_ECE)
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if (ece_ack)
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tp->prior_ssthresh = 0;
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/* B. In all the states check for reneging SACKs. */
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@ -2828,7 +2829,7 @@ static void tcp_fastretrans_alert(struct sock *sk, const u32 prior_snd_una,
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case TCP_CA_Recovery:
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if (!(flag & FLAG_SND_UNA_ADVANCED)) {
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if (tcp_is_reno(tp))
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tcp_add_reno_sack(sk, num_dupack);
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tcp_add_reno_sack(sk, num_dupack, ece_ack);
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} else {
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if (tcp_try_undo_partial(sk, prior_snd_una))
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return;
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@ -2853,7 +2854,7 @@ static void tcp_fastretrans_alert(struct sock *sk, const u32 prior_snd_una,
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if (tcp_is_reno(tp)) {
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if (flag & FLAG_SND_UNA_ADVANCED)
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tcp_reset_reno_sack(tp);
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tcp_add_reno_sack(sk, num_dupack);
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tcp_add_reno_sack(sk, num_dupack, ece_ack);
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}
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if (icsk->icsk_ca_state <= TCP_CA_Disorder)
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@ -2877,7 +2878,7 @@ static void tcp_fastretrans_alert(struct sock *sk, const u32 prior_snd_una,
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}
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/* Otherwise enter Recovery state */
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tcp_enter_recovery(sk, (flag & FLAG_ECE));
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tcp_enter_recovery(sk, ece_ack);
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fast_rexmit = 1;
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}
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@ -3053,7 +3054,7 @@ static void tcp_ack_tstamp(struct sock *sk, struct sk_buff *skb,
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*/
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static int tcp_clean_rtx_queue(struct sock *sk, u32 prior_fack,
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u32 prior_snd_una,
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struct tcp_sacktag_state *sack)
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struct tcp_sacktag_state *sack, bool ece_ack)
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{
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const struct inet_connection_sock *icsk = inet_csk(sk);
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u64 first_ackt, last_ackt;
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@ -3191,7 +3192,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, u32 prior_fack,
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}
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if (tcp_is_reno(tp)) {
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tcp_remove_reno_sacks(sk, pkts_acked);
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tcp_remove_reno_sacks(sk, pkts_acked, ece_ack);
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/* If any of the cumulatively ACKed segments was
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* retransmitted, non-SACK case cannot confirm that
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@ -3685,7 +3686,8 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
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goto no_queue;
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/* See if we can take anything off of the retransmit queue. */
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flag |= tcp_clean_rtx_queue(sk, prior_fack, prior_snd_una, &sack_state);
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flag |= tcp_clean_rtx_queue(sk, prior_fack, prior_snd_una, &sack_state,
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flag & FLAG_ECE);
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tcp_rack_update_reo_wnd(sk, &rs);
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