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Date:   Wed, 13 May 2020 08:26:28 +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 13/33] tcp: add tcp_sock_set_syncnt

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

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/nvme/host/tcp.c |  9 +--------
 include/linux/tcp.h     |  1 +
 net/ipv4/tcp.c          | 12 ++++++++++++
 3 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index a8070f93fd0a0..8417eeb83fcd2 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1336,14 +1336,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
 	}
 
 	/* Single syn retry */
-	opt = 1;
-	ret = kernel_setsockopt(queue->sock, IPPROTO_TCP, TCP_SYNCNT,
-			(char *)&opt, sizeof(opt));
-	if (ret) {
-		dev_err(nctrl->device,
-			"failed to set TCP_SYNCNT sock opt %d\n", ret);
-		goto err_sock;
-	}
+	tcp_sock_set_syncnt(queue->sock->sk, 1);
 
 	/* Set TCP no delay */
 	tcp_sock_set_nodelay(queue->sock->sk, true);
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index e7ab6da5111b5..77b832acf3398 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -497,5 +497,6 @@ int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount,
 void tcp_sock_set_cork(struct sock *sk, bool on);
 void tcp_sock_set_nodelay(struct sock *sk, bool on);
 void tcp_sock_set_quickack(struct sock *sk, int val);
+int tcp_sock_set_syncnt(struct sock *sk, int val);
 
 #endif	/* _LINUX_TCP_H */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index c681f43f0bb85..773b5cd366ab7 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2870,6 +2870,18 @@ void tcp_sock_set_quickack(struct sock *sk, int val)
 }
 EXPORT_SYMBOL(tcp_sock_set_quickack);
 
+int tcp_sock_set_syncnt(struct sock *sk, int val)
+{
+	if (val < 1 || val > MAX_TCP_SYNCNT)
+		return -EINVAL;
+
+	lock_sock(sk);
+	inet_csk(sk)->icsk_syn_retries = val;
+	release_sock(sk);
+	return 0;
+}
+EXPORT_SYMBOL(tcp_sock_set_syncnt);
+
 /*
  *	Socket option code for TCP.
  */
-- 
2.26.2

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