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Revert "Revert "tcp: ensure to use the most recently sent skb when filling the rate sample"" 

This reverts commit 5deab346ca.

It was originally reverted as it broke the abi but can now be safely
brought back.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I1a084a80d2f0c669874468ad897c7d104016f1c6
This commit is contained in:
Greg Kroah-Hartman 2022-05-24 18:59:22 +02:00 committed by Todd Kjos
parent 3efd03d0af
commit 9306af3c47
2 changed files with 14 additions and 3 deletions
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6
include/net/tcp.h
View File

@ -1028,6 +1028,7 @@ struct rate_sample {
int losses; /* number of packets marked lost upon ACK */
u32 acked_sacked; /* number of packets newly (S)ACKed upon ACK */
u32 prior_in_flight; /* in flight before this ACK */
u32 last_end_seq; /* end_seq of most recently ACKed packet */
bool is_app_limited; /* is sample from packet with bubble in pipe? */
bool is_retrans; /* is sample from retransmission? */
bool is_ack_delayed; /* is this (likely) a delayed ACK? */
@ -1150,6 +1151,11 @@ void tcp_rate_gen(struct sock *sk, u32 delivered, u32 lost,
bool is_sack_reneg, struct rate_sample *rs);
void tcp_rate_check_app_limited(struct sock *sk);
static inline bool tcp_skb_sent_after(u64 t1, u64 t2, u32 seq1, u32 seq2)
{
return t1 > t2 || (t1 == t2 && after(seq1, seq2));
}
/* These functions determine how the current flow behaves in respect of SACK
* handling. SACK is negotiated with the peer, and therefore it can vary
* between different flows.

11
net/ipv4/tcp_rate.c
View File

@ -73,26 +73,31 @@ void tcp_rate_skb_sent(struct sock *sk, struct sk_buff *skb)
*
* If an ACK (s)acks multiple skbs (e.g., stretched-acks), this function is
* called multiple times. We favor the information from the most recently
* sent skb, i.e., the skb with the highest prior_delivered count.
* sent skb, i.e., the skb with the most recently sent time and the highest
* sequence.
*/
void tcp_rate_skb_delivered(struct sock *sk, struct sk_buff *skb,
struct rate_sample *rs)
{
struct tcp_sock *tp = tcp_sk(sk);
struct tcp_skb_cb *scb = TCP_SKB_CB(skb);
u64 tx_tstamp;
if (!scb->tx.delivered_mstamp)
return;
tx_tstamp = tcp_skb_timestamp_us(skb);
if (!rs->prior_delivered ||
after(scb->tx.delivered, rs->prior_delivered)) {
tcp_skb_sent_after(tx_tstamp, tp->first_tx_mstamp,
scb->end_seq, rs->last_end_seq)) {
rs->prior_delivered = scb->tx.delivered;
rs->prior_mstamp = scb->tx.delivered_mstamp;
rs->is_app_limited = scb->tx.is_app_limited;
rs->is_retrans = scb->sacked & TCPCB_RETRANS;
rs->last_end_seq = scb->end_seq;
/* Record send time of most recently ACKed packet: */
tp->first_tx_mstamp = tcp_skb_timestamp_us(skb);
tp->first_tx_mstamp = tx_tstamp;
/* Find the duration of the "send phase" of this window: */
rs->interval_us = tcp_stamp_us_delta(tp->first_tx_mstamp,
scb->tx.first_tx_mstamp);