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Date:   Thu, 14 Sep 2023 16:07:13 +0200
From:   Stefano Garzarella <sgarzare@redhat.com>
To:     Arseniy Krasnov <avkrasnov@salutedevices.com>
Cc:     Stefan Hajnoczi <stefanha@redhat.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Jason Wang <jasowang@redhat.com>,
        Bobby Eshleman <bobby.eshleman@bytedance.com>,
        kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        kernel@sberdevices.ru, oxffffaa@gmail.com
Subject: Re: [PATCH net-next v8 0/4] vsock/virtio/vhost: MSG_ZEROCOPY
 preparations
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References: <20230911202234.1932024-1-avkrasnov@salutedevices.com>
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Hi Arseniy,

On Mon, Sep 11, 2023 at 11:22:30PM +0300, Arseniy Krasnov wrote:
>Hello,
>
>this patchset is first of three parts of another big patchset for
>MSG_ZEROCOPY flag support:
>https://lore.kernel.org/netdev/20230701063947.3422088-1-AVKrasnov@sberdevices.ru/
>
>During review of this series, Stefano Garzarella <sgarzare@redhat.com>
>suggested to split it for three parts to simplify review and merging:
>
>1) virtio and vhost updates (for fragged skbs) <--- this patchset
>2) AF_VSOCK updates (allows to enable MSG_ZEROCOPY mode and read
>   tx completions) and update for Documentation/.
>3) Updates for tests and utils.
>
>This series enables handling of fragged skbs in virtio and vhost parts.
>Newly logic won't be triggered, because SO_ZEROCOPY options is still
>impossible to enable at this moment (next bunch of patches from big
>set above will enable it).
>
>I've included changelog to some patches anyway, because there were some
>comments during review of last big patchset from the link above.

Thanks, I left some comments on patch 4, the others LGTM.
Sorry to not having spotted them before, but moving
virtio_transport_alloc_skb() around the file, made the patch a little
confusing and difficult to review.

In addition, I started having failures of test 14 (server: host,
client: guest), so I looked better to see if there was anything wrong,
but it fails me even without this series applied.

It happens to me intermittently (~30%), does it happen to you?
Can you take a look at it?

host$ ./vsock_test --mode=server --control-port=12345 --peer-cid=4
...
14 - SOCK_STREAM virtio skb merge...expected recv(2) returns 8 bytes, got 3

guest$ ./vsock_test --mode=client --control-host=192.168.133.2 --control-port=12345 --peer-cid=2

Thanks,
Stefano