From: Lawrence Brakmo <brakmo@fb.com>
To: netdev <netdev@vger.kernel.org>
Cc: Kernel Team <kernel-team@fb.com>,
Neal Cardwell <ncardwell@google.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
Yuchung Cheng <ycheng@google.com>
Subject: [RFC PATCH v4 net-next 3/4] tcp: add in_flight to tcp_skb_cb
Date: Fri, 24 Jul 2015 19:47:05 -0700 [thread overview]
Message-ID: <1437792426-1724090-4-git-send-email-brakmo@fb.com> (raw)
In-Reply-To: <1437792426-1724090-1-git-send-email-brakmo@fb.com>
Add in_flight (bytes in flight when packet was sent) field
to tx component of tcp_skb_cb and make it available to
congestion modules' pkts_acked() function through the
ack_sample function argument.
Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
---
include/net/tcp.h | 2 ++
net/ipv4/tcp_input.c | 5 ++++-
net/ipv4/tcp_output.c | 4 +++-
3 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 7c510ed..f850404 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -757,6 +757,7 @@ struct tcp_skb_cb {
union {
struct {
/* There is space for up to 20 bytes */
+ __u32 in_flight;/* Bytes in flight when packet sent */
} tx; /* only used for outgoing skbs */
union {
struct inet_skb_parm h4;
@@ -842,6 +843,7 @@ union tcp_cc_info;
struct ack_sample {
u32 pkts_acked;
s32 rtt_us;
+ u32 in_flight;
};
struct tcp_congestion_ops {
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 423d3af..3ab4178 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3068,6 +3068,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
long ca_rtt_us = -1L;
struct sk_buff *skb;
u32 pkts_acked = 0;
+ u32 last_in_flight = 0;
bool rtt_update;
int flag = 0;
@@ -3107,6 +3108,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
if (!first_ackt.v64)
first_ackt = last_ackt;
+ last_in_flight = TCP_SKB_CB(skb)->tx.in_flight;
reord = min(pkts_acked, reord);
if (!after(scb->end_seq, tp->high_seq))
flag |= FLAG_ORIG_SACK_ACKED;
@@ -3196,7 +3198,8 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
}
if (icsk->icsk_ca_ops->pkts_acked) {
- struct ack_sample sample = {pkts_acked, ca_rtt_us};
+ struct ack_sample sample = {pkts_acked, ca_rtt_us,
+ last_in_flight};
icsk->icsk_ca_ops->pkts_acked(sk, &sample);
}
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 7105784..e9deab5 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -920,9 +920,12 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
int err;
BUG_ON(!skb || !tcp_skb_pcount(skb));
+ tp = tcp_sk(sk);
if (clone_it) {
skb_mstamp_get(&skb->skb_mstamp);
+ TCP_SKB_CB(skb)->tx.in_flight = TCP_SKB_CB(skb)->end_seq
+ - tp->snd_una;
if (unlikely(skb_cloned(skb)))
skb = pskb_copy(skb, gfp_mask);
@@ -933,7 +936,6 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
}
inet = inet_sk(sk);
- tp = tcp_sk(sk);
tcb = TCP_SKB_CB(skb);
memset(&opts, 0, sizeof(opts));
--
1.8.1
next prev parent reply other threads:[~2015-07-25 2:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-25 2:47 [RFC PATCH v4 net-next 0/4] tcp: add NV congestion control Lawrence Brakmo
2015-07-25 2:47 ` [RFC PATCH v4 net-next 1/4] tcp: replace cnt & rtt with struct in pkts_acked() Lawrence Brakmo
2015-07-25 6:22 ` Eric Dumazet
2015-07-27 18:46 ` Stephen Hemminger
2015-07-27 19:30 ` Lawrence Brakmo
2015-07-28 3:42 ` Alexei Starovoitov
2015-07-25 2:47 ` [RFC PATCH v4 net-next 2/4] tcp: refactor struct tcp_skb_cb Lawrence Brakmo
2015-07-25 2:47 ` Lawrence Brakmo [this message]
2015-07-25 2:47 ` [RFC PATCH v4 net-next 4/4] tcp: add NV congestion control Lawrence Brakmo
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