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tcp: count sacked packets in tcp_sacktag_state 

Add sack_delivered to tcp_sacktag_state and count the number of sacked
and dsacked packets. 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>
zero-sugar-mainline-defconfig
Yousuk Seung 2020-06-26 21:05:34 -07:00 committed by David S. Miller
parent c634e34f6e
commit f00394ce60
1 changed files with 4 additions and 0 deletions
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4
net/ipv4/tcp_input.c
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@ -1138,6 +1138,7 @@ struct tcp_sacktag_state {
struct rate_sample *rate;
int flag;
unsigned int mss_now;
u32 sack_delivered;
};
/* Check if skb is fully within the SACK block. In presence of GSO skbs,
@ -1259,6 +1260,7 @@ static u8 tcp_sacktag_one(struct sock *sk,
state->flag |= FLAG_DATA_SACKED;
tp->sacked_out += pcount;
tp->delivered += pcount; /* Out-of-order packets delivered */
state->sack_delivered += pcount;
/* Lost marker hint past SACKed? Tweak RFC3517 cnt */
if (tp->lost_skb_hint &&
@ -1685,6 +1687,7 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
if (found_dup_sack) {
state->flag |= FLAG_DSACKING_ACK;
tp->delivered++; /* A spurious retransmission is delivered */
state->sack_delivered++;
}
/* Eliminate too old ACKs, but take into
@ -3586,6 +3589,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
sack_state.first_sackt = 0;
sack_state.rate = &rs;
sack_state.sack_delivered = 0;
/* We very likely will need to access rtx queue. */
prefetch(sk->tcp_rtx_queue.rb_node);