linux-kernel - Re: [PATCH net-next v9 2/4] virtio/vsock: send credit update during setting SO

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Message-ID: <rambimqosesmdqnko3ttcntpzrq7cm376pln6qsohtz7phm3un@ln3ate7qmcp7>
Date:   Thu, 14 Dec 2023 10:57:30 +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 v9 2/4] virtio/vsock: send credit update during
 setting SO_RCVLOWAT

On Thu, Dec 14, 2023 at 12:19:45PM +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()'.
>
>Fixes: b89d882dc9fc ("vsock/virtio: reduce credit update messages")
>Signed-off-by: Arseniy Krasnov <avkrasnov@...utedevices.com>
>Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
>Acked-by: Michael S. Tsirkin <mst@...hat.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.
> v5 -> v6:
>  * Reorder callbacks in transport structures.
>  * Do to send credit update when 'fwd_cnt' == 'last_fwd_cnt'.
> v8 -> v9:
>  * Add 'Fixes' tag.
>
> 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 | 30 +++++++++++++++++++++++++
> net/vmw_vsock/vsock_loopback.c          |  1 +
> 5 files changed, 34 insertions(+)

As I already mentioned in the cover letter, this patch doesn't compile
unless we apply patch 3 before this one, so:

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