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tcp: new helper to calculate newly delivered 

Add new helper tcp_newly_delivered() to prepare the ECN accounting change.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng 2018-04-17 23:18:47 -07:00 committed by David S. Miller
parent bef5767f37
commit a77fa0104a
1 changed files with 15 additions and 2 deletions
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17
net/ipv4/tcp_input.c
View File

@ -3496,6 +3496,16 @@ static void tcp_xmit_recovery(struct sock *sk, int rexmit)
tcp_xmit_retransmit_queue(sk);
}
/* Returns the number of packets newly acked or sacked by the current ACK */
static u32 tcp_newly_delivered(struct sock *sk, u32 prior_delivered, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
u32 delivered;
delivered = tp->delivered - prior_delivered;
return delivered;
}
/* This routine deals with incoming acks, but not outgoing ones. */
static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
{
@ -3619,7 +3629,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
if ((flag & FLAG_FORWARD_PROGRESS) || !(flag & FLAG_NOT_DUP))
sk_dst_confirm(sk);
delivered = tp->delivered - delivered; /* freshly ACKed or SACKed */
delivered = tcp_newly_delivered(sk, delivered, flag);
lost = tp->lost - lost; /* freshly marked lost */
rs.is_ack_delayed = !!(flag & FLAG_ACK_MAYBE_DELAYED);
tcp_rate_gen(sk, delivered, lost, is_sack_reneg, sack_state.rate);
@ -3629,9 +3639,11 @@ 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)
if (flag & FLAG_DSACKING_ACK) {
tcp_fastretrans_alert(sk, prior_snd_una, is_dupack, &flag,
&rexmit);
tcp_newly_delivered(sk, delivered, 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
* it needs to be for normal retransmission.
@ -3655,6 +3667,7 @@ old_ack:
&sack_state);
tcp_fastretrans_alert(sk, prior_snd_una, is_dupack, &flag,
&rexmit);
tcp_newly_delivered(sk, delivered, flag);
tcp_xmit_recovery(sk, rexmit);
}