[PATCH 09/33] net: add sock_set_reuseport

[Christoph Hellwig <hch@xxxxxx>]

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

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 include/net/sock.h    |  1 +
 net/core/sock.c       |  8 ++++++++
 net/sunrpc/xprtsock.c | 17 +----------------
 3 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index e1ed40ff01312..6b8e06947b243 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2688,6 +2688,7 @@ static inline bool sk_dev_equal_l3scope(struct sock *sk, int dif)
 
 void sock_def_readable(struct sock *sk);
 void sock_set_reuseaddr(struct sock *sk, unsigned char reuse);
+void sock_set_reuseport(struct sock *sk, bool reuseport);
 void sock_set_linger(struct sock *sk, bool onoff, unsigned int linger);
 void sock_set_priority(struct sock *sk, u32 priority);
 void sock_set_sndtimeo(struct sock *sk, unsigned int secs);
diff --git a/net/core/sock.c b/net/core/sock.c
index 6af01b757cf24..7f0baf1ccde17 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -729,6 +729,14 @@ void sock_set_reuseaddr(struct sock *sk, unsigned char reuse)
 }
 EXPORT_SYMBOL(sock_set_reuseaddr);
 
+void sock_set_reuseport(struct sock *sk, bool reuseport)
+{
+	lock_sock(sk);
+	sk->sk_reuseport = reuseport;
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_reuseport);
+
 static void __sock_set_linger(struct sock *sk, bool onoff, unsigned int linger)
 {
 	if (!onoff) {
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index bb61d3758be2b..3dc2d52371a0e 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1594,21 +1594,6 @@ static int xs_get_random_port(void)
 	return rand + min;
 }
 
-/**
- * xs_set_reuseaddr_port - set the socket's port and address reuse options
- * @sock: socket
- *
- * Note that this function has to be called on all sockets that share the
- * same port, and it must be called before binding.
- */
-static void xs_sock_set_reuseport(struct socket *sock)
-{
-	int opt = 1;
-
-	kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
-			(char *)&opt, sizeof(opt));
-}
-
 static unsigned short xs_sock_getport(struct socket *sock)
 {
 	struct sockaddr_storage buf;
@@ -1801,7 +1786,7 @@ static struct socket *xs_create_sock(struct rpc_xprt *xprt,
 	xs_reclassify_socket(family, sock);
 
 	if (reuseport)
-		xs_sock_set_reuseport(sock);
+		sock_set_reuseport(sock->sk, true);
 
 	err = xs_bind(transport, sock);
 	if (err) {
-- 
2.26.2