The VMware VMCI transport supports loopback inside virtual machines.
This patch implements loopback for virtio-vsock.
Flow control is handled by the virtio-vsock protocol as usual. The
sending process stops transmitting on a connection when the peer's
receive buffer space is exhausted.
Cathy Avery <cavery@redhat.com> noticed this difference between VMCI and
virtio-vsock when a test case using loopback failed. Although loopback
isn't the main point of AF_VSOCK, it is useful for testing and
virtio-vsock must match VMCI semantics so that userspace programs run
regardless of the underlying transport.
My understanding is that loopback is not supported on the host side with
VMCI. Follow that by implementing it only in the guest driver, not the
vhost host driver.
Cc: Jorgen Hansen <jhansen@vmware.com>
Reported-by: Cathy Avery <cavery@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Remove unnecessary use of enable/disable callback notifications
and the incorrect more space available check.
The virtio_transport_tx_work handles when the TX virtqueue
has more buffers available.
Signed-off-by: Gerard Garcia <ggarcia@deic.uab.cat>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
VM sockets virtio transport implementation. This driver runs in the
guest.
Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Stefan Hajnoczi