netdev - [PATCH net-next 42/44] tcp: Add tso_segs() CC callback for TCP Prague

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Message-Id: <20241015102940.26157-43-chia-yu.chang@nokia-bell-labs.com>
Date: Tue, 15 Oct 2024 12:29:38 +0200
From: chia-yu.chang@...ia-bell-labs.com
To: netdev@...r.kernel.org, ij@...nel.org, ncardwell@...gle.com,
        koen.de_schepper@...ia-bell-labs.com, g.white@...leLabs.com,
        ingemar.s.johansson@...csson.com, mirja.kuehlewind@...csson.com,
        cheshire@...le.com, rs.ietf@....at, Jason_Livingood@...cast.com,
        vidhi_goel@...le.com
Cc: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
Subject: [PATCH net-next 42/44] tcp: Add tso_segs() CC callback for TCP Prague

From: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>

This patch adds tso_segs() CC callbak for CC algorithm to provides
explicit tso segment number of each data burst and overrides
tcp_tso_autosize().

No functional change.

Signed-off-by: Ilpo Järvinen <ij@...nel.org>
Signed-off-by: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
---
 include/net/tcp.h     | 3 +++
 net/ipv4/tcp_output.c | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index ffb3971105b1..ce7230c1ba5f 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1322,6 +1322,9 @@ struct tcp_congestion_ops {
 	/* override sysctl_tcp_min_tso_segs */
 	u32 (*min_tso_segs)(struct sock *sk);
 
+	/* override tcp_tso_autosize */
+	u32 (*tso_segs)(struct sock *sk, u32 mss_now);
+
 	/* call when packets are delivered to update cwnd and pacing rate,
 	 * after all the ca_state processing. (optional)
 	 */
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 4e00ebf6bd42..0f0e79b42941 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2275,7 +2275,9 @@ static u32 tcp_tso_segs(struct sock *sk, unsigned int mss_now)
 			ca_ops->min_tso_segs(sk) :
 			READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_min_tso_segs);
 
-	tso_segs = tcp_tso_autosize(sk, mss_now, min_tso);
+	tso_segs = ca_ops->tso_segs ?
+			ca_ops->tso_segs(sk, mss_now) :
+			tcp_tso_autosize(sk, mss_now, min_tso);
 	return min_t(u32, tso_segs, sk->sk_gso_max_segs);
 }
 
-- 
2.34.1