linux-kernel - Re: [RFC PATCH v8 13/19] virtio/vsock: rest of SOCK

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Date:   Wed, 21 Apr 2021 11:12:28 +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>,
        Alexander Popov <alex.popov@...ux.com>,
        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 v8 13/19] virtio/vsock: rest of SOCK_SEQPACKET support

On Tue, Apr 13, 2021 at 03:45:25PM +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.
>4) Set 'VIRTIO_VSOCK_SEQ_EOR' bit in flags for last
>   packet of message.
>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@...persky.com>
>---
>v7 -> v8:
> - MSG_EOR handling is removed, i didn't found exact description about
>   how it works in POSIX.
> - SEQ_BEGIN, SEQ_END, etc. now removed.
>
> include/linux/virtio_vsock.h            |  6 ++++++
> net/vmw_vsock/virtio_transport_common.c | 16 ++++++++++++++--
> 2 files changed, 20 insertions(+), 2 deletions(-)
>
>diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
>index 02acf6e9ae04..f00a01bfdd7e 100644
>--- a/include/linux/virtio_vsock.h
>+++ b/include/linux/virtio_vsock.h
>@@ -68,6 +68,8 @@ struct virtio_transport {
>
>       /* Takes ownership of the packet */
>       int (*send_pkt)(struct virtio_vsock_pkt *pkt);
>+
>+      bool seqpacket_allow;
> };
>
> ssize_t
>@@ -80,6 +82,10 @@ 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 572869fef832..4c5b63601308 100644
>--- a/net/vmw_vsock/virtio_transport_common.c
>+++ b/net/vmw_vsock/virtio_transport_common.c
>@@ -74,6 +74,9 @@ 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)
>+                      pkt->hdr.flags |= VIRTIO_VSOCK_SEQ_EOR;

We should set the flag in info->flags and assign it using cpu_to_le32() 
or just the following:
			pkt->hdr.flags = cpu_to_le32(info->flags |
						VIRTIO_VSOCK_SEQ_EOR);


>       }
>
>       trace_virtio_transport_alloc_pkt(src_cid, src_port,
>@@ -187,7 +190,7 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
>       struct virtio_vsock_pkt *pkt;
>       u32 pkt_len = info->pkt_len;
>
>-      info->type = VIRTIO_VSOCK_TYPE_STREAM;
>+      info->type = virtio_transport_get_type(sk_vsock(vsk));
>
>       t_ops = virtio_transport_get_ops(vsk);
>       if (unlikely(!t_ops))
>@@ -486,6 +489,15 @@ virtio_transport_seqpacket_dequeue(struct 
>vsock_sock *vsk,
> }
> EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_dequeue);
>
>+int
>+virtio_transport_seqpacket_enqueue(struct vsock_sock *vsk,
>+                                 struct msghdr *msg,
>+                                 size_t len)
>+{
>+      return virtio_transport_stream_enqueue(vsk, msg, len);
>+}
>+EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_enqueue);
>+
> int
> virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
>                              struct msghdr *msg,
>@@ -905,7 +917,7 @@ void virtio_transport_release(struct vsock_sock *vsk)
>       struct sock *sk = &vsk->sk;
>       bool remove_sock = true;
>
>-      if (sk->sk_type == SOCK_STREAM)
>+      if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)
>               remove_sock = virtio_transport_close(vsk);
>
>       list_for_each_entry_safe(pkt, tmp, &vvs->rx_queue, list) {
>--
>2.25.1
>