linux-kernel - Re: [RFC PATCH v3 2/4] vsock/vmci: convert VMCI error code to -ENOMEM on receive

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Message-ID: <9fd06ca5-ace9-251d-34af-aca4db9c3ee0@sberdevices.ru>
Date:   Thu, 30 Mar 2023 23:18:36 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>,
        Bryan Tan <bryantan@...are.com>, Vishnu Dasa <vdasa@...are.com>
CC:     <kvm@...r.kernel.org>, <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...rdevices.ru>, <oxffffaa@...il.com>,
        <pv-drivers@...are.com>
Subject: Re: [RFC PATCH v3 2/4] vsock/vmci: convert VMCI error code to -ENOMEM
 on receive



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@...rdevices.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(