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Message-ID: <vfgguhcj45a3k5k6jcbjzgwfoiecryvvxploswnvjmehcctqeu@rbw2ac4jk5ik>
Date: Wed, 31 Jul 2024 09:15:12 +0200
From: Stefano Garzarella <sgarzare@...hat.com>
To: luigi.leonardi@...look.com
Cc: "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Stefan Hajnoczi <stefanha@...hat.com>, 
	"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
	Eugenio PĂ©rez <eperezma@...hat.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	virtualization@...ts.linux.dev, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org
Subject: Re: [PATCH net-next v4 2/3] vsock/virtio: add SIOCOUTQ support for
 all virtio based transports

On Tue, Jul 30, 2024 at 09:43:07PM GMT, Luigi Leonardi via B4 Relay wrote:
>From: Luigi Leonardi <luigi.leonardi@...look.com>
>
>Introduce support for virtio_transport_unsent_bytes
>ioctl for virtio_transport, vhost_vsock and vsock_loopback.
>
>For all transports the unsent bytes counter is incremented
>in virtio_transport_get_credit.
>
>In virtio_transport (G2H) and in vhost-vsock (H2G) the counter
>is decremented when the skbuff is consumed. In vsock_loopback the
>same skbuff is passed from the transmitter to the receiver, so
>the counter is decremented before queuing the skbuff to the
>receiver.
>
>Signed-off-by: Luigi Leonardi <luigi.leonardi@...look.com>
>---
> drivers/vhost/vsock.c                   |  4 +++-
> include/linux/virtio_vsock.h            |  6 ++++++
> net/vmw_vsock/virtio_transport.c        |  4 +++-
> net/vmw_vsock/virtio_transport_common.c | 35 +++++++++++++++++++++++++++++++++
> net/vmw_vsock/vsock_loopback.c          |  6 ++++++
> 5 files changed, 53 insertions(+), 2 deletions(-)


Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>


>
>diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
>index bf664ec9341b..802153e23073 100644
>--- a/drivers/vhost/vsock.c
>+++ b/drivers/vhost/vsock.c
>@@ -244,7 +244,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
> 					restart_tx = true;
> 			}
>
>-			consume_skb(skb);
>+			virtio_transport_consume_skb_sent(skb, true);
> 		}
> 	} while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len)));
> 	if (added)
>@@ -451,6 +451,8 @@ static struct virtio_transport vhost_transport = {
> 		.notify_buffer_size       = virtio_transport_notify_buffer_size,
> 		.notify_set_rcvlowat      = virtio_transport_notify_set_rcvlowat,
>
>+		.unsent_bytes             = virtio_transport_unsent_bytes,
>+
> 		.read_skb = virtio_transport_read_skb,
> 	},
>
>diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
>index c82089dee0c8..0387d64e2c66 100644
>--- a/include/linux/virtio_vsock.h
>+++ b/include/linux/virtio_vsock.h
>@@ -133,6 +133,7 @@ struct virtio_vsock_sock {
> 	u32 tx_cnt;
> 	u32 peer_fwd_cnt;
> 	u32 peer_buf_alloc;
>+	size_t bytes_unsent;
>
> 	/* Protected by rx_lock */
> 	u32 fwd_cnt;
>@@ -193,6 +194,11 @@ s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
> s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
> u32 virtio_transport_seqpacket_has_data(struct vsock_sock *vsk);
>
>+ssize_t virtio_transport_unsent_bytes(struct vsock_sock *vsk);
>+
>+void virtio_transport_consume_skb_sent(struct sk_buff *skb,
>+				       bool consume);
>+
> int virtio_transport_do_socket_init(struct vsock_sock *vsk,
> 				 struct vsock_sock *psk);
> int
>diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
>index 64a07acfef12..e0160da4ef43 100644
>--- a/net/vmw_vsock/virtio_transport.c
>+++ b/net/vmw_vsock/virtio_transport.c
>@@ -311,7 +311,7 @@ static void virtio_transport_tx_work(struct work_struct *work)
>
> 		virtqueue_disable_cb(vq);
> 		while ((skb = virtqueue_get_buf(vq, &len)) != NULL) {
>-			consume_skb(skb);
>+			virtio_transport_consume_skb_sent(skb, true);
> 			added = true;
> 		}
> 	} while (!virtqueue_enable_cb(vq));
>@@ -540,6 +540,8 @@ static struct virtio_transport virtio_transport = {
> 		.notify_buffer_size       = virtio_transport_notify_buffer_size,
> 		.notify_set_rcvlowat      = virtio_transport_notify_set_rcvlowat,
>
>+		.unsent_bytes             = virtio_transport_unsent_bytes,
>+
> 		.read_skb = virtio_transport_read_skb,
> 	},
>
>diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
>index 16ff976a86e3..884ee128851e 100644
>--- a/net/vmw_vsock/virtio_transport_common.c
>+++ b/net/vmw_vsock/virtio_transport_common.c
>@@ -463,6 +463,26 @@ void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct sk_buff *
> }
> EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
>
>+void virtio_transport_consume_skb_sent(struct sk_buff *skb, bool consume)
>+{
>+	struct sock *s = skb->sk;
>+
>+	if (s && skb->len) {
>+		struct vsock_sock *vs = vsock_sk(s);
>+		struct virtio_vsock_sock *vvs;
>+
>+		vvs = vs->trans;
>+
>+		spin_lock_bh(&vvs->tx_lock);
>+		vvs->bytes_unsent -= skb->len;
>+		spin_unlock_bh(&vvs->tx_lock);
>+	}
>+
>+	if (consume)
>+		consume_skb(skb);
>+}
>+EXPORT_SYMBOL_GPL(virtio_transport_consume_skb_sent);
>+
> u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
> {
> 	u32 ret;
>@@ -475,6 +495,7 @@ u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
> 	if (ret > credit)
> 		ret = credit;
> 	vvs->tx_cnt += ret;
>+	vvs->bytes_unsent += ret;
> 	spin_unlock_bh(&vvs->tx_lock);
>
> 	return ret;
>@@ -488,6 +509,7 @@ void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
>
> 	spin_lock_bh(&vvs->tx_lock);
> 	vvs->tx_cnt -= credit;
>+	vvs->bytes_unsent -= credit;
> 	spin_unlock_bh(&vvs->tx_lock);
> }
> EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
>@@ -1090,6 +1112,19 @@ void virtio_transport_destruct(struct vsock_sock *vsk)
> }
> EXPORT_SYMBOL_GPL(virtio_transport_destruct);
>
>+ssize_t virtio_transport_unsent_bytes(struct vsock_sock *vsk)
>+{
>+	struct virtio_vsock_sock *vvs = vsk->trans;
>+	size_t ret;
>+
>+	spin_lock_bh(&vvs->tx_lock);
>+	ret = vvs->bytes_unsent;
>+	spin_unlock_bh(&vvs->tx_lock);
>+
>+	return ret;
>+}
>+EXPORT_SYMBOL_GPL(virtio_transport_unsent_bytes);
>+
> static int virtio_transport_reset(struct vsock_sock *vsk,
> 				  struct sk_buff *skb)
> {
>diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c
>index 6dea6119f5b2..6e78927a598e 100644
>--- a/net/vmw_vsock/vsock_loopback.c
>+++ b/net/vmw_vsock/vsock_loopback.c
>@@ -98,6 +98,8 @@ static struct virtio_transport loopback_transport = {
> 		.notify_buffer_size       = virtio_transport_notify_buffer_size,
> 		.notify_set_rcvlowat      = virtio_transport_notify_set_rcvlowat,
>
>+		.unsent_bytes             = virtio_transport_unsent_bytes,
>+
> 		.read_skb = virtio_transport_read_skb,
> 	},
>
>@@ -123,6 +125,10 @@ static void vsock_loopback_work(struct work_struct *work)
> 	spin_unlock_bh(&vsock->pkt_queue.lock);
>
> 	while ((skb = __skb_dequeue(&pkts))) {
>+		/* Decrement the bytes_unsent counter without deallocating skb
>+		 * It is freed by the receiver.
>+		 */
>+		virtio_transport_consume_skb_sent(skb, false);
> 		virtio_transport_deliver_tap_pkt(skb);
> 		virtio_transport_recv_pkt(&loopback_transport, skb);
> 	}
>
>-- 
>2.45.2
>
>


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