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 <redacted>
---
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;

      }

      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