linux-kernel - Re: [RFC PATCH v4 17/17] virtio/vsock: simplify credit update function API

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Message-ID: <20210211143922.pfvngujv6k7lutll@steredhat>
Date:   Thu, 11 Feb 2021 15:39:22 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseny Krasnov <arseny.krasnov@...persky.com>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jorgen Hansen <jhansen@...are.com>,
        Andra Paraschiv <andraprs@...zon.com>,
        Colin Ian King <colin.king@...onical.com>,
        Alexander Popov <alex.popov@...ux.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, stsp2@...dex.ru, oxffffaa@...il.com
Subject: Re: [RFC PATCH v4 17/17] virtio/vsock: simplify credit update
 function API

On Sun, Feb 07, 2021 at 06:19:03PM +0300, Arseny Krasnov wrote:
>'virtio_transport_send_credit_update()' has some extra args:
>1) 'type' may be set in 'virtio_transport_send_pkt_info()' using type
>   of socket.
>2) This function is static and 'hdr' arg was always NULL.
>

Okay, I saw this patch after my previous comment.

I think this looks good, but please move this before your changes (e.g.  
before patch 'virtio/vsock: dequeue callback for SOCK_SEQPACKET').

In this way you don't need to modify 
virtio_transport_notify_buffer_size(), calling 
virtio_transport_get_type() and then remove these changes.

It's generally not a good idea to make changes in a patch and then 
remove them a few patches later in the same series. This should ring a 
bell about moving these changes before others.

Thanks,
Stefano

>Signed-off-by: Arseny Krasnov <arseny.krasnov@...persky.com>
>---
> net/vmw_vsock/virtio_transport_common.c | 20 +++++---------------
> 1 file changed, 5 insertions(+), 15 deletions(-)
>
>diff --git a/net/vmw_vsock/virtio_transport_common.c 
>b/net/vmw_vsock/virtio_transport_common.c
>index 0aa0fd33e9d6..46308679c8a4 100644
>--- a/net/vmw_vsock/virtio_transport_common.c
>+++ b/net/vmw_vsock/virtio_transport_common.c
>@@ -286,13 +286,10 @@ void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
> }
> EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
>
>-static int virtio_transport_send_credit_update(struct vsock_sock *vsk,
>-					       int type,
>-					       struct virtio_vsock_hdr *hdr)
>+static int virtio_transport_send_credit_update(struct vsock_sock *vsk)
> {
> 	struct virtio_vsock_pkt_info info = {
> 		.op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
>-		.type = type,
> 		.vsk = vsk,
> 	};
>
>@@ -401,9 +398,7 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
> 	 * with different values.
> 	 */
> 	if (free_space < VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
>-		virtio_transport_send_credit_update(vsk,
>-						    VIRTIO_VSOCK_TYPE_STREAM,
>-						    NULL);
>+		virtio_transport_send_credit_update(vsk);
> 	}
>
> 	return total;
>@@ -525,9 +520,7 @@ size_t virtio_transport_seqpacket_seq_get_len(struct vsock_sock *vsk)
> 	spin_unlock_bh(&vvs->rx_lock);
>
> 	if (bytes_dropped)
>-		virtio_transport_send_credit_update(vsk,
>-						    VIRTIO_VSOCK_TYPE_SEQPACKET,
>-						    NULL);
>+		virtio_transport_send_credit_update(vsk);
>
> 	return vvs->user_read_seq_len;
> }
>@@ -624,8 +617,7 @@ static int virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk,
>
> 	spin_unlock_bh(&vvs->rx_lock);
>
>-	virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_SEQPACKET,
>-					    NULL);
>+	virtio_transport_send_credit_update(vsk);
>
> 	return err;
> }
>@@ -735,15 +727,13 @@ EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
> void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val)
> {
> 	struct virtio_vsock_sock *vvs = vsk->trans;
>-	int type;
>
> 	if (*val > VIRTIO_VSOCK_MAX_BUF_SIZE)
> 		*val = VIRTIO_VSOCK_MAX_BUF_SIZE;
>
> 	vvs->buf_alloc = *val;
>
>-	type = virtio_transport_get_type(sk_vsock(vsk));
>-	virtio_transport_send_credit_update(vsk, type, NULL);
>+	virtio_transport_send_credit_update(vsk);
> }
> EXPORT_SYMBOL_GPL(virtio_transport_notify_buffer_size);
>
>-- 
>2.25.1
>