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Message-ID: <u4vwlyg3v4lpz72hnovpkifr3jduen7kwnjn5gvgm3wvfthgpd@6ftqoqjxdim6>
Date: Thu, 30 Nov 2023 14:30:48 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: Arseniy Krasnov <avkrasnov@...utedevices.com>
Cc: Stefan Hajnoczi <stefanha@...hat.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
Bobby Eshleman <bobby.eshleman@...edance.com>, kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org, kernel@...rdevices.ru,
oxffffaa@...il.com
Subject: Re: [PATCH net-next v5 2/3] virtio/vsock: send credit update during
setting SO_RCVLOWAT
On Thu, Nov 30, 2023 at 04:08:39PM +0300, Arseniy Krasnov wrote:
>Send credit update message when SO_RCVLOWAT is updated and it is bigger
>than number of bytes in rx queue. It is needed, because 'poll()' will
>wait until number of bytes in rx queue will be not smaller than
>SO_RCVLOWAT, so kick sender to send more data. Otherwise mutual hungup
>for tx/rx is possible: sender waits for free space and receiver is
>waiting data in 'poll()'.
>
>Signed-off-by: Arseniy Krasnov <avkrasnov@...utedevices.com>
>---
> Changelog:
> v1 -> v2:
> * Update commit message by removing 'This patch adds XXX' manner.
> * Do not initialize 'send_update' variable - set it directly during
> first usage.
> v3 -> v4:
> * Fit comment in 'virtio_transport_notify_set_rcvlowat()' to 80 chars.
> v4 -> v5:
> * Do not change callbacks order in transport structures.
>
> drivers/vhost/vsock.c | 1 +
> include/linux/virtio_vsock.h | 1 +
> net/vmw_vsock/virtio_transport.c | 1 +
> net/vmw_vsock/virtio_transport_common.c | 27 +++++++++++++++++++++++++
> net/vmw_vsock/vsock_loopback.c | 1 +
> 5 files changed, 31 insertions(+)
>
>diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
>index f75731396b7e..4146f80db8ac 100644
>--- a/drivers/vhost/vsock.c
>+++ b/drivers/vhost/vsock.c
>@@ -451,6 +451,7 @@ static struct virtio_transport vhost_transport = {
> .notify_buffer_size = virtio_transport_notify_buffer_size,
>
> .read_skb = virtio_transport_read_skb,
>+ .notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat
As we discussed in chat, better the order of the previous version, but
leaving the line of `.read_skb` untouched (with the final comma).
With that fixed in all transports, feel free to add:
Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
> },
>
> .send_pkt = vhost_transport_send_pkt,
>diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
>index ebb3ce63d64d..c82089dee0c8 100644
>--- a/include/linux/virtio_vsock.h
>+++ b/include/linux/virtio_vsock.h
>@@ -256,4 +256,5 @@ void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit);
> void virtio_transport_deliver_tap_pkt(struct sk_buff *skb);
> int virtio_transport_purge_skbs(void *vsk, struct sk_buff_head *list);
> int virtio_transport_read_skb(struct vsock_sock *vsk, skb_read_actor_t read_actor);
>+int virtio_transport_notify_set_rcvlowat(struct vsock_sock *vsk, int val);
> #endif /* _LINUX_VIRTIO_VSOCK_H */
>diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
>index af5bab1acee1..8007593a3a93 100644
>--- a/net/vmw_vsock/virtio_transport.c
>+++ b/net/vmw_vsock/virtio_transport.c
>@@ -539,6 +539,7 @@ static struct virtio_transport virtio_transport = {
> .notify_buffer_size = virtio_transport_notify_buffer_size,
>
> .read_skb = virtio_transport_read_skb,
>+ .notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat
> },
>
> .send_pkt = virtio_transport_send_pkt,
>diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
>index f6dc896bf44c..1cb556ad4597 100644
>--- a/net/vmw_vsock/virtio_transport_common.c
>+++ b/net/vmw_vsock/virtio_transport_common.c
>@@ -1684,6 +1684,33 @@ int virtio_transport_read_skb(struct vsock_sock *vsk, skb_read_actor_t recv_acto
> }
> EXPORT_SYMBOL_GPL(virtio_transport_read_skb);
>
>+int virtio_transport_notify_set_rcvlowat(struct vsock_sock *vsk, int val)
>+{
>+ struct virtio_vsock_sock *vvs = vsk->trans;
>+ bool send_update;
>+
>+ spin_lock_bh(&vvs->rx_lock);
>+
>+ /* If number of available bytes is less than new SO_RCVLOWAT value,
>+ * kick sender to send more data, because sender may sleep in its
>+ * 'send()' syscall waiting for enough space at our side.
>+ */
>+ send_update = vvs->rx_bytes < val;
>+
>+ spin_unlock_bh(&vvs->rx_lock);
>+
>+ if (send_update) {
>+ int err;
>+
>+ err = virtio_transport_send_credit_update(vsk);
>+ if (err < 0)
>+ return err;
>+ }
>+
>+ return 0;
>+}
>+EXPORT_SYMBOL_GPL(virtio_transport_notify_set_rcvlowat);
>+
> MODULE_LICENSE("GPL v2");
> MODULE_AUTHOR("Asias He");
> MODULE_DESCRIPTION("common code for virtio vsock");
>diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c
>index 048640167411..9f4b814fbbc7 100644
>--- a/net/vmw_vsock/vsock_loopback.c
>+++ b/net/vmw_vsock/vsock_loopback.c
>@@ -98,6 +98,7 @@ static struct virtio_transport loopback_transport = {
> .notify_buffer_size = virtio_transport_notify_buffer_size,
>
> .read_skb = virtio_transport_read_skb,
>+ .notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat
> },
>
> .send_pkt = vsock_loopback_send_pkt,
>--
>2.25.1
>
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