2024-12-10 00:17:37 +03:00
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From 205288c0ef4b4059c0ae8a2bb85b74a1c371d700 Mon Sep 17 00:00:00 2001
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2024-10-29 05:12:06 +03:00
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From: Neal Cardwell <ncardwell@google.com>
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Date: Thu, 12 Oct 2017 23:44:27 -0400
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Subject: [PATCH 04/19] net-tcp_bbr: v2: count packets lost over TCP rate
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sampling interval
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For understanding the relationship between inflight and packet loss
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signals, to try to find the highest inflight value that has acceptable
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levels of packet losses.
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Effort: net-tcp_bbr
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Origin-9xx-SHA1: 4527e26b2bd7756a88b5b9ef1ada3da33dd609ab
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Change-Id: I594c2500868d9c530770e7ddd68ffc87c57f4fd5
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Signed-off-by: Alexandre Frade <kernel@xanmod.org>
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---
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include/net/tcp.h | 5 ++++-
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net/ipv4/tcp_rate.c | 3 +++
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2 files changed, 7 insertions(+), 1 deletion(-)
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--- a/include/net/tcp.h
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+++ b/include/net/tcp.h
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@@ -985,6 +985,7 @@ struct tcp_skb_cb {
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#define TCPCB_IN_FLIGHT_MAX ((1U << TCPCB_IN_FLIGHT_BITS) - 1)
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u32 in_flight:20, /* packets in flight at transmit */
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unused2:12;
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+ u32 lost; /* packets lost so far upon tx of skb */
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} tx; /* only used for outgoing skbs */
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union {
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struct inet_skb_parm h4;
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2024-12-10 00:17:37 +03:00
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@@ -1139,11 +1140,13 @@ struct ack_sample {
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2024-10-29 05:12:06 +03:00
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*/
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struct rate_sample {
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u64 prior_mstamp; /* starting timestamp for interval */
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+ u32 prior_lost; /* tp->lost at "prior_mstamp" */
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u32 prior_delivered; /* tp->delivered at "prior_mstamp" */
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u32 prior_delivered_ce;/* tp->delivered_ce at "prior_mstamp" */
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u32 tx_in_flight; /* packets in flight at starting timestamp */
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+ s32 lost; /* number of packets lost over interval */
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s32 delivered; /* number of packets delivered over interval */
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- s32 delivered_ce; /* number of packets delivered w/ CE marks*/
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+ s32 delivered_ce; /* packets delivered w/ CE mark over interval */
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long interval_us; /* time for tp->delivered to incr "delivered" */
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u32 snd_interval_us; /* snd interval for delivered packets */
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u32 rcv_interval_us; /* rcv interval for delivered packets */
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--- a/net/ipv4/tcp_rate.c
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+++ b/net/ipv4/tcp_rate.c
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@@ -84,6 +84,7 @@ void tcp_rate_skb_sent(struct sock *sk,
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TCP_SKB_CB(skb)->tx.delivered_mstamp = tp->delivered_mstamp;
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TCP_SKB_CB(skb)->tx.delivered = tp->delivered;
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TCP_SKB_CB(skb)->tx.delivered_ce = tp->delivered_ce;
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+ TCP_SKB_CB(skb)->tx.lost = tp->lost;
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TCP_SKB_CB(skb)->tx.is_app_limited = tp->app_limited ? 1 : 0;
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tcp_set_tx_in_flight(sk, skb);
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}
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@@ -110,6 +111,7 @@ void tcp_rate_skb_delivered(struct sock
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if (!rs->prior_delivered ||
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tcp_skb_sent_after(tx_tstamp, tp->first_tx_mstamp,
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scb->end_seq, rs->last_end_seq)) {
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+ rs->prior_lost = scb->tx.lost;
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rs->prior_delivered_ce = scb->tx.delivered_ce;
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rs->prior_delivered = scb->tx.delivered;
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rs->prior_mstamp = scb->tx.delivered_mstamp;
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@@ -165,6 +167,7 @@ void tcp_rate_gen(struct sock *sk, u32 d
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return;
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}
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rs->delivered = tp->delivered - rs->prior_delivered;
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+ rs->lost = tp->lost - rs->prior_lost;
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rs->delivered_ce = tp->delivered_ce - rs->prior_delivered_ce;
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/* delivered_ce occupies less than 32 bits in the skb control block */
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