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Message-ID: <9fd06ca5-ace9-251d-34af-aca4db9c3ee0@sberdevices.ru>
Date:   Thu, 30 Mar 2023 23:18:36 +0300
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Subject: Re: [RFC PATCH v3 2/4] vsock/vmci: convert VMCI error code to -ENOMEM
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Content-Language: en-US
To:     Stefan Hajnoczi <stefanha@redhat.com>,
        Stefano Garzarella <sgarzare@redhat.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Bobby Eshleman <bobby.eshleman@bytedance.com>,
        Bryan Tan <bryantan@vmware.com>, Vishnu Dasa <vdasa@vmware.com>
CC:     <kvm@vger.kernel.org>, <virtualization@lists.linux-foundation.org>,
        <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <kernel@sberdevices.ru>, <oxffffaa@gmail.com>,
        <pv-drivers@vmware.com>
References: <4d34fac8-7170-5a3e-5043-42a9f7e4b5b3@sberdevices.ru>
From:   Arseniy Krasnov <avkrasnov@sberdevices.ru>
In-Reply-To: <4d34fac8-7170-5a3e-5043-42a9f7e4b5b3@sberdevices.ru>
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Precedence: bulk


On 30.03.2023 23:13, Arseniy Krasnov wrote:
> This adds conversion of VMCI specific error code to general -ENOMEM. It
> is needed, because af_vsock.c passes error value returned from transport
> to the user, which does not expect to get VMCI_ERROR_* values.

@Stefano, I have some doubts about this commit message, as it says "... af_vsock.c
passes error value returned from transport to the user ...", but this
behaviour is implemented only in the next patch. Is it ok, if both patches
are in a single patchset?

For patch 1 I think it is ok, as it fixes current implementation.

Thanks, Arseniy

> 
> Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
> ---
>  net/vmw_vsock/vmci_transport.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
> index 95cc4d79ba29..b370070194fa 100644
> --- a/net/vmw_vsock/vmci_transport.c
> +++ b/net/vmw_vsock/vmci_transport.c
> @@ -1831,10 +1831,17 @@ static ssize_t vmci_transport_stream_dequeue(
>  	size_t len,
>  	int flags)
>  {
> +	ssize_t err;
> +
>  	if (flags & MSG_PEEK)
> -		return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
> +		err = vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
>  	else
> -		return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
> +		err = vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
> +
> +	if (err < 0)
> +		err = -ENOMEM;
> +
> +	return err;
>  }
>  
>  static ssize_t vmci_transport_stream_enqueue(