linux-kernel - [PATCH 28/33] sctp: add sctp_sock_set

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Date:   Wed, 13 May 2020 08:26:43 +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 28/33] sctp: add sctp_sock_set_nodelay

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

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/dlm/lowcomms.c       | 10 ++--------
 include/net/sctp/sctp.h |  1 +
 net/sctp/socket.c       |  8 ++++++++
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index e4939d770df53..6fa45365666a8 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1034,7 +1034,6 @@ static int sctp_bind_addrs(struct connection *con, uint16_t port)
 static void sctp_connect_to_sock(struct connection *con)
 {
 	struct sockaddr_storage daddr;
-	int one = 1;
 	int result;
 	int addr_len;
 	struct socket *sock;
@@ -1081,8 +1080,7 @@ static void sctp_connect_to_sock(struct connection *con)
 	log_print("connecting to %d", con->nodeid);
 
 	/* Turn off Nagle's algorithm */
-	kernel_setsockopt(sock, SOL_SCTP, SCTP_NODELAY, (char *)&one,
-			  sizeof(one));
+	sctp_sock_set_nodelay(sock->sk, true);
 
 	/*
 	 * Make sock->ops->connect() function return in specified time,
@@ -1296,7 +1294,6 @@ static int sctp_listen_for_all(void)
 	struct socket *sock = NULL;
 	int result = -EINVAL;
 	struct connection *con = nodeid2con(0, GFP_NOFS);
-	int one = 1;
 
 	if (!con)
 		return -ENOMEM;
@@ -1311,10 +1308,7 @@ static int sctp_listen_for_all(void)
 	}
 
 	sock_set_rcvbuf(sock->sk, NEEDED_RMEM);
-	result = kernel_setsockopt(sock, SOL_SCTP, SCTP_NODELAY, (char *)&one,
-				   sizeof(one));
-	if (result < 0)
-		log_print("Could not set SCTP NODELAY error %d\n", result);
+	sctp_sock_set_nodelay(sock->sk, true);
 
 	write_lock_bh(&sock->sk->sk_callback_lock);
 	/* Init con struct */
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index f702b14d768ba..b505fa082f254 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -617,5 +617,6 @@ static inline bool sctp_newsk_ready(const struct sock *sk)
 
 int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *kaddrs,
 		int addrs_size, int op);
+void sctp_sock_set_nodelay(struct sock *sk, bool val);
 
 #endif /* __net_sctp_h__ */
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 30c981d9f6158..64c395f7a86d5 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3066,6 +3066,14 @@ static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
 	return 0;
 }
 
+void sctp_sock_set_nodelay(struct sock *sk, bool val)
+{
+	lock_sock(sk);
+	sctp_sk(sk)->nodelay = val;
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sctp_sock_set_nodelay);
+
 /*
  *
  * 7.1.1 SCTP_RTOINFO
-- 
2.26.2