linux-kernel - [PATCH] tcp: export symbol tcp_set_congestion

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Message-Id: <20220310134830.130818-1-sunmingbao@tom.com>
Date:   Thu, 10 Mar 2022 21:48:30 +0800
From:   Mingbao Sun <sunmingbao@....com>
To:     Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>, sunmingbao@....com,
        tyler.sun@...l.com, ping.gan@...l.com, yanxiu.cai@...l.com,
        libin.zhang@...l.com, ao.sun@...l.com
Subject: [PATCH] tcp: export symbol tcp_set_congestion_control

From: Mingbao Sun <tyler.sun@...l.com>

congestion-control could have a noticeable impaction on the
performance of TCP-based communications. This is of course true
to NVMe/TCP in the kernel.

Different congestion-controls (e.g., cubic, dctcp) are suitable for
different scenarios. Proper adoption of congestion control would
benefit the performance. On the contrary, the performance could be
destroyed.

So to gain excellent performance against different network
environments, NVMe/TCP tends to support specifying the
congestion-control.

This means NVMe/TCP (a kernel user) needs to set the congestion-control
of its TCP sockets.

Since the kernel API 'kernel_setsockopt' was removed, and since the
function ‘tcp_set_congestion_control’ is just the real underlying guy
handling this job, so it makes sense to get it exported.

Signed-off-by: Mingbao Sun <tyler.sun@...l.com>
---
 net/ipv4/tcp_cong.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index db5831e6c136..5d77f3e7278e 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -383,6 +383,7 @@ int tcp_set_congestion_control(struct sock *sk, const char *name, bool load,
 	rcu_read_unlock();
 	return err;
 }
+EXPORT_SYMBOL_GPL(tcp_set_congestion_control);

 /* Slow start is used when congestion window is no greater than the slow start
  * threshold. We base on RFC2581 and also handle stretch ACKs properly.
-- 
2.26.2