linux-kernel - Re: [RFC PATCH v9 13/19] virtio/vsock: rest of SOCK

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Date:   Thu, 13 May 2021 15:03:13 +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>,
        Andra Paraschiv <andraprs@...zon.com>,
        Colin Ian King <colin.king@...onical.com>,
        Norbert Slusarek <nslusarek@....net>,
        kvm <kvm@...r.kernel.org>,
        Linux Virtualization <virtualization@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        stsp <stsp2@...dex.ru>, Krasnov Arseniy <oxffffaa@...il.com>
Subject: Re: [RFC PATCH v9 13/19] virtio/vsock: rest of SOCK_SEQPACKET support

sdf

On Thu, May 13, 2021 at 2:27 PM Stefano Garzarella <sgarzare@...hat.com> wrote:
>
> On Sat, May 08, 2021 at 07:35:54PM +0300, Arseny Krasnov wrote:
> >This adds rest of logic for SEQPACKET:
> >1) Send SHUTDOWN on socket close for SEQPACKET type.
> >2) Set SEQPACKET packet type during send.
> >3) 'seqpacket_allow' flag to virtio transport.
>
> Please update this commit message, point 3 is not included anymore in
> this patch, right?
>
> >4) Set 'VIRTIO_VSOCK_SEQ_EOR' bit in flags for last
> >   packet of message.
> >
> >Signed-off-by: Arseny Krasnov <arseny.krasnov@...persky.com>
> >---
> > v8 -> v9:
> > 1) Use cpu_to_le32() to set VIRTIO_VSOCK_SEQ_EOR.
> >
> > include/linux/virtio_vsock.h            |  4 ++++
> > net/vmw_vsock/virtio_transport_common.c | 17 +++++++++++++++--
> > 2 files changed, 19 insertions(+), 2 deletions(-)
> >
> >diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
> >index 02acf6e9ae04..7360ab7ea0af 100644
> >--- a/include/linux/virtio_vsock.h
> >+++ b/include/linux/virtio_vsock.h
> >@@ -80,6 +80,10 @@ virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
> >                              struct msghdr *msg,
> >                              size_t len, int flags);
> >
> >+int
> >+virtio_transport_seqpacket_enqueue(struct vsock_sock *vsk,
> >+                                 struct msghdr *msg,
> >+                                 size_t len);
> > ssize_t
> > virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk,
> >                                  struct msghdr *msg,
> >diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
> >index 7fea0a2192f7..b6608b4ac7c2 100644
> >--- a/net/vmw_vsock/virtio_transport_common.c
> >+++ b/net/vmw_vsock/virtio_transport_common.c
> >@@ -74,6 +74,10 @@ virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
> >               err = memcpy_from_msg(pkt->buf, info->msg, len);
> >               if (err)
> >                       goto out;
> >+
> >+              if (info->msg->msg_iter.count == 0)
>
> Also here is better `msg_data_left(info->msg)`
>
> >+                      pkt->hdr.flags = cpu_to_le32(info->flags |
> >+                                              VIRTIO_VSOCK_SEQ_EOR);
>
> Re-thinking an alternative could be to set EOR here...
>
>                         info->flags |= VIRTIO_VSOCK_SEQ_EOR;

Or just `pkt->hdr.flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR)`, as you 
did in vhost-vsock :-)