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Message-Id: <20251028-net-tcp-recv-autotune-v3-3-74b43ba4c84c@kernel.org>
Date: Tue, 28 Oct 2025 12:58:01 +0100
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>,
Neal Cardwell <ncardwell@...gle.com>, Kuniyuki Iwashima <kuniyu@...gle.com>,
"David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
David Ahern <dsahern@...nel.org>, Matthieu Baerts <matttbe@...nel.org>,
Mat Martineau <martineau@...nel.org>, Geliang Tang <geliang@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
mptcp@...ts.linux.dev
Subject: [PATCH net v3 3/4] tcp: add newval parameter to tcp_rcvbuf_grow()
From: Eric Dumazet <edumazet@...gle.com>
This patch has no functional change, and prepares the following one.
tcp_rcvbuf_grow() will need to have access to tp->rcvq_space.space
old and new values.
Change mptcp_rcvbuf_grow() in a similar way.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
[ Moved 'oldval' declaration to the next patch to avoid warnings at
build time. ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
include/net/tcp.h | 2 +-
net/ipv4/tcp_input.c | 14 +++++++-------
net/mptcp/protocol.c | 20 ++++++++------------
3 files changed, 16 insertions(+), 20 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5ca230ed526a..ab20f549b8f9 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -370,7 +370,7 @@ void tcp_delack_timer_handler(struct sock *sk);
int tcp_ioctl(struct sock *sk, int cmd, int *karg);
enum skb_drop_reason tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb);
void tcp_rcv_established(struct sock *sk, struct sk_buff *skb);
-void tcp_rcvbuf_grow(struct sock *sk);
+void tcp_rcvbuf_grow(struct sock *sk, u32 newval);
void tcp_rcv_space_adjust(struct sock *sk);
int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);
void tcp_twsk_destructor(struct sock *sk);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 31ea5af49f2d..cb4e07f84ae2 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -891,18 +891,20 @@ static inline void tcp_rcv_rtt_measure_ts(struct sock *sk,
}
}
-void tcp_rcvbuf_grow(struct sock *sk)
+void tcp_rcvbuf_grow(struct sock *sk, u32 newval)
{
const struct net *net = sock_net(sk);
struct tcp_sock *tp = tcp_sk(sk);
- int rcvwin, rcvbuf, cap;
+ u32 rcvwin, rcvbuf, cap;
+
+ tp->rcvq_space.space = newval;
if (!READ_ONCE(net->ipv4.sysctl_tcp_moderate_rcvbuf) ||
(sk->sk_userlocks & SOCK_RCVBUF_LOCK))
return;
/* slow start: allow the sender to double its rate. */
- rcvwin = tp->rcvq_space.space << 1;
+ rcvwin = newval << 1;
if (!RB_EMPTY_ROOT(&tp->out_of_order_queue))
rcvwin += TCP_SKB_CB(tp->ooo_last_skb)->end_seq - tp->rcv_nxt;
@@ -943,9 +945,7 @@ void tcp_rcv_space_adjust(struct sock *sk)
trace_tcp_rcvbuf_grow(sk, time);
- tp->rcvq_space.space = copied;
-
- tcp_rcvbuf_grow(sk);
+ tcp_rcvbuf_grow(sk, copied);
new_measure:
tp->rcvq_space.seq = tp->copied_seq;
@@ -5270,7 +5270,7 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
}
/* do not grow rcvbuf for not-yet-accepted or orphaned sockets. */
if (sk->sk_socket)
- tcp_rcvbuf_grow(sk);
+ tcp_rcvbuf_grow(sk, tp->rcvq_space.space);
}
static int __must_check tcp_queue_rcv(struct sock *sk, struct sk_buff *skb,
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index a8a3bdf95543..052a0c62023f 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -194,17 +194,18 @@ static bool mptcp_ooo_try_coalesce(struct mptcp_sock *msk, struct sk_buff *to,
* - mptcp does not maintain a msk-level window clamp
* - returns true when the receive buffer is actually updated
*/
-static bool mptcp_rcvbuf_grow(struct sock *sk)
+static bool mptcp_rcvbuf_grow(struct sock *sk, u32 newval)
{
struct mptcp_sock *msk = mptcp_sk(sk);
const struct net *net = sock_net(sk);
- int rcvwin, rcvbuf, cap;
+ u32 rcvwin, rcvbuf, cap;
+ msk->rcvq_space.space = newval;
if (!READ_ONCE(net->ipv4.sysctl_tcp_moderate_rcvbuf) ||
(sk->sk_userlocks & SOCK_RCVBUF_LOCK))
return false;
- rcvwin = msk->rcvq_space.space << 1;
+ rcvwin = newval << 1;
if (!RB_EMPTY_ROOT(&msk->out_of_order_queue))
rcvwin += MPTCP_SKB_CB(msk->ooo_last_skb)->end_seq - msk->ack_seq;
@@ -334,7 +335,7 @@ static void mptcp_data_queue_ofo(struct mptcp_sock *msk, struct sk_buff *skb)
skb_set_owner_r(skb, sk);
/* do not grow rcvbuf for not-yet-accepted or orphaned sockets. */
if (sk->sk_socket)
- mptcp_rcvbuf_grow(sk);
+ mptcp_rcvbuf_grow(sk, msk->rcvq_space.space);
}
static void mptcp_init_skb(struct sock *ssk, struct sk_buff *skb, int offset,
@@ -2049,10 +2050,7 @@ static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied)
if (msk->rcvq_space.copied <= msk->rcvq_space.space)
goto new_measure;
- msk->rcvq_space.space = msk->rcvq_space.copied;
- if (mptcp_rcvbuf_grow(sk)) {
- int copied = msk->rcvq_space.copied;
-
+ if (mptcp_rcvbuf_grow(sk, msk->rcvq_space.copied)) {
/* Make subflows follow along. If we do not do this, we
* get drops at subflow level if skbs can't be moved to
* the mptcp rx queue fast enough (announced rcv_win can
@@ -2065,10 +2063,8 @@ static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied)
ssk = mptcp_subflow_tcp_sock(subflow);
slow = lock_sock_fast(ssk);
/* subflows can be added before tcp_init_transfer() */
- if (tcp_sk(ssk)->rcvq_space.space) {
- tcp_sk(ssk)->rcvq_space.space = copied;
- tcp_rcvbuf_grow(ssk);
- }
+ if (tcp_sk(ssk)->rcvq_space.space)
+ tcp_rcvbuf_grow(ssk, msk->rcvq_space.copied);
unlock_sock_fast(ssk, slow);
}
}
--
2.51.0
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