netdev - [PATCH 16/33] tcp: add tcp_sock_set

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Date:   Wed, 13 May 2020 08:26:31 +0200
From:   Christoph Hellwig <hch@....de>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Jon Maloy <jmaloy@...hat.com>,
        Ying Xue <ying.xue@...driver.com>, drbd-dev@...ts.linbit.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-nvme@...ts.infradead.org,
        target-devel@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-cifs@...r.kernel.org, cluster-devel@...hat.com,
        ocfs2-devel@....oracle.com, netdev@...r.kernel.org,
        linux-sctp@...r.kernel.org, ceph-devel@...r.kernel.org,
        rds-devel@....oracle.com, linux-nfs@...r.kernel.org
Subject: [PATCH 16/33] tcp: add tcp_sock_set_keepintvl

Add a helper to directly set the TCP_KEEPINTVL sockopt from kernel space
without going through a fake uaccess.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/linux/tcp.h   |  1 +
 net/ipv4/tcp.c        | 12 ++++++++++++
 net/rds/tcp_listen.c  |  4 +---
 net/sunrpc/xprtsock.c |  3 +--
 4 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 4d3a3e959e45b..dad18ca361c01 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -500,5 +500,6 @@ void tcp_sock_set_quickack(struct sock *sk, int val);
 int tcp_sock_set_syncnt(struct sock *sk, int val);
 void tcp_sock_set_user_timeout(struct sock *sk, u32 val);
 int tcp_sock_set_keepidle(struct sock *sk, int val);
+int tcp_sock_set_keepintvl(struct sock *sk, int val);
 
 #endif	/* _LINUX_TCP_H */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 22eb9159c7d05..b714f2b2fa54e 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2923,6 +2923,18 @@ int tcp_sock_set_keepidle(struct sock *sk, int val)
 }
 EXPORT_SYMBOL(tcp_sock_set_keepidle);
 
+int tcp_sock_set_keepintvl(struct sock *sk, int val)
+{
+	if (val < 1 || val > MAX_TCP_KEEPINTVL)
+		return -EINVAL;
+
+	lock_sock(sk);
+	tcp_sk(sk)->keepalive_intvl = val * HZ;
+	release_sock(sk);
+	return 0;
+}
+EXPORT_SYMBOL(tcp_sock_set_keepintvl);
+
 /*
  *	Socket option code for TCP.
  */
diff --git a/net/rds/tcp_listen.c b/net/rds/tcp_listen.c
index 8c76969d8c878..a5db2f8bb7339 100644
--- a/net/rds/tcp_listen.c
+++ b/net/rds/tcp_listen.c
@@ -53,12 +53,10 @@ int rds_tcp_keepalive(struct socket *sock)
 		goto bail;
 
 	tcp_sock_set_keepidle(sock->sk, keepidle);
-
 	/* KEEPINTVL is the interval between successive probes. We follow
 	 * the model in xs_tcp_finish_connecting() and re-use keepidle.
 	 */
-	ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL,
-				(char *)&keepidle, sizeof(keepidle));
+	tcp_sock_set_keepintvl(sock->sk, keepidle);
 bail:
 	return ret;
 }
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index ea79446789c69..e20de4a52edb7 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2108,8 +2108,7 @@ static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
 	/* TCP Keepalive options */
 	sock_set_keepalive(sock->sk, 1);
 	tcp_sock_set_keepidle(sock->sk, keepidle);
-	kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
-			(char *)&keepidle, sizeof(keepidle));
+	tcp_sock_set_keepintvl(sock->sk, keepidle);
 	kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
 			(char *)&keepcnt, sizeof(keepcnt));
 
-- 
2.26.2