linux-kernel - Re: [PATCH v10 04/18] af_vsock: implement SEQPACKET receive loop

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Message-ID: <20210525140816.btiv5v6e3vguxxun@steredhat>
Date:   Tue, 25 May 2021 16:08:16 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseny Krasnov <arseny.krasnov@...persky.com>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jorgen Hansen <jhansen@...are.com>,
        Colin Ian King <colin.king@...onical.com>,
        Andra Paraschiv <andraprs@...zon.com>,
        Norbert Slusarek <nslusarek@....net>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, oxffffaa@...il.com
Subject: Re: [PATCH v10 04/18] af_vsock: implement SEQPACKET receive loop

On Thu, May 20, 2021 at 10:16:08PM +0300, Arseny Krasnov wrote:
>Add receive loop for SEQPACKET. It looks like receive loop for
>STREAM, but there are differences:
>1) It doesn't call notify callbacks.
>2) It doesn't care about 'SO_SNDLOWAT' and 'SO_RCVLOWAT' values, because
>   there is no sense for these values in SEQPACKET case.
>3) It waits until whole record is received or error is found during
>   receiving.
>4) It processes and sets 'MSG_TRUNC' flag.
>
>So to avoid extra conditions for two types of socket inside one loop, two
>independent functions were created.
>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@...persky.com>
>---
> v9 -> v10:
> 1) Use 'msg_data_left()' instead of direct access to 'msg_hdr'.
>
> include/net/af_vsock.h   |  4 +++
> net/vmw_vsock/af_vsock.c | 72 +++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 75 insertions(+), 1 deletion(-)

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