Re: [RFC PATCH v4 1/3] vsock: update SO_RCVLOWAT setting callback

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On Thu, Nov 30, 2023 at 12:25:17AM +0300, Arseniy Krasnov wrote:
Do not return if transport callback for SO_RCVLOWAT is set (only in
error case). In this case we don't need to set 'sk_rcvlowat' field in
each transport - only in 'vsock_set_rcvlowat()'. Also, if 'sk_rcvlowat'
is now set only in af_vsock.c, change callback name from 'set_rcvlowat'
to 'notify_set_rcvlowat'.

Signed-off-by: Arseniy Krasnov <avkrasnov@xxxxxxxxxxxxxxxxx>
---
Changelog:
v3 -> v4:
 * Rename 'set_rcvlowat' to 'notify_set_rcvlowat'.
 * Commit message updated.

Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>


include/net/af_vsock.h           | 2 +-
net/vmw_vsock/af_vsock.c         | 9 +++++++--
net/vmw_vsock/hyperv_transport.c | 4 ++--
3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index e302c0e804d0..535701efc1e5 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -137,7 +137,6 @@ struct vsock_transport {
	u64 (*stream_rcvhiwat)(struct vsock_sock *);
	bool (*stream_is_active)(struct vsock_sock *);
	bool (*stream_allow)(u32 cid, u32 port);
-	int (*set_rcvlowat)(struct vsock_sock *vsk, int val);

	/* SEQ_PACKET. */
	ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
@@ -168,6 +167,7 @@ struct vsock_transport {
		struct vsock_transport_send_notify_data *);
	/* sk_lock held by the caller */
	void (*notify_buffer_size)(struct vsock_sock *, u64 *);
+	int (*notify_set_rcvlowat)(struct vsock_sock *vsk, int val);

	/* Shutdown. */
	int (*shutdown)(struct vsock_sock *, int);
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 816725af281f..54ba7316f808 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -2264,8 +2264,13 @@ static int vsock_set_rcvlowat(struct sock *sk, int val)

	transport = vsk->transport;

-	if (transport && transport->set_rcvlowat)
-		return transport->set_rcvlowat(vsk, val);
+	if (transport && transport->notify_set_rcvlowat) {
+		int err;
+
+		err = transport->notify_set_rcvlowat(vsk, val);
+		if (err)
+			return err;
+	}

	WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
	return 0;
diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c
index 7cb1a9d2cdb4..e2157e387217 100644
--- a/net/vmw_vsock/hyperv_transport.c
+++ b/net/vmw_vsock/hyperv_transport.c
@@ -816,7 +816,7 @@ int hvs_notify_send_post_enqueue(struct vsock_sock *vsk, ssize_t written,
}

static
-int hvs_set_rcvlowat(struct vsock_sock *vsk, int val)
+int hvs_notify_set_rcvlowat(struct vsock_sock *vsk, int val)
{
	return -EOPNOTSUPP;
}
@@ -856,7 +856,7 @@ static struct vsock_transport hvs_transport = {
	.notify_send_pre_enqueue  = hvs_notify_send_pre_enqueue,
	.notify_send_post_enqueue = hvs_notify_send_post_enqueue,

-	.set_rcvlowat             = hvs_set_rcvlowat
+	.notify_set_rcvlowat      = hvs_notify_set_rcvlowat
};

static bool hvs_check_transport(struct vsock_sock *vsk)
--
2.25.1






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