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vsock: add vsock_loopback transport

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This patch adds a new vsock_loopback transport to handle local
communication.
This transport is based on the loopback implementation of
virtio_transport, so it uses the virtio_transport_common APIs
to interface with the vsock core.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Garzarella 2019-12-10 11:43:05 +01:00 committed by David S. Miller
parent 0e12190578
commit 077263fba1
4 changed files with 194 additions and 0 deletions
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1
MAINTAINERS
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@ -17480,6 +17480,7 @@ F: net/vmw_vsock/diag.c
F: net/vmw_vsock/af_vsock_tap.c
F: net/vmw_vsock/virtio_transport_common.c
F: net/vmw_vsock/virtio_transport.c
F: net/vmw_vsock/vsock_loopback.c
F: drivers/net/vsockmon.c
F: drivers/vhost/vsock.c
F: tools/testing/vsock/

12
net/vmw_vsock/Kconfig
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@ -26,6 +26,18 @@ config VSOCKETS_DIAG
Enable this module so userspace applications can query open sockets.
config VSOCKETS_LOOPBACK
tristate "Virtual Sockets loopback transport"
depends on VSOCKETS
default y
select VIRTIO_VSOCKETS_COMMON
help
This module implements a loopback transport for Virtual Sockets,
using vmw_vsock_virtio_transport_common.
To compile this driver as a module, choose M here: the module
will be called vsock_loopback. If unsure, say N.
config VMWARE_VMCI_VSOCKETS
tristate "VMware VMCI transport for Virtual Sockets"
depends on VSOCKETS && VMWARE_VMCI

1
net/vmw_vsock/Makefile
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@ -5,6 +5,7 @@ obj-$(CONFIG_VMWARE_VMCI_VSOCKETS) += vmw_vsock_vmci_transport.o
obj-$(CONFIG_VIRTIO_VSOCKETS) += vmw_vsock_virtio_transport.o
obj-$(CONFIG_VIRTIO_VSOCKETS_COMMON) += vmw_vsock_virtio_transport_common.o
obj-$(CONFIG_HYPERV_VSOCKETS) += hv_sock.o
obj-$(CONFIG_VSOCKETS_LOOPBACK) += vsock_loopback.o
vsock-y += af_vsock.o af_vsock_tap.o vsock_addr.o

180
net/vmw_vsock/vsock_loopback.c Normal file
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@ -0,0 +1,180 @@
// SPDX-License-Identifier: GPL-2.0-only
/* loopback transport for vsock using virtio_transport_common APIs
*
* Copyright (C) 2013-2019 Red Hat, Inc.
* Authors: Asias He <asias@redhat.com>
* Stefan Hajnoczi <stefanha@redhat.com>
* Stefano Garzarella <sgarzare@redhat.com>
*
*/
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/virtio_vsock.h>
struct vsock_loopback {
struct workqueue_struct *workqueue;
spinlock_t pkt_list_lock; /* protects pkt_list */
struct list_head pkt_list;
struct work_struct pkt_work;
};
static struct vsock_loopback the_vsock_loopback;
static u32 vsock_loopback_get_local_cid(void)
{
return VMADDR_CID_LOCAL;
}
static int vsock_loopback_send_pkt(struct virtio_vsock_pkt *pkt)
{
struct vsock_loopback *vsock = &the_vsock_loopback;
int len = pkt->len;
spin_lock_bh(&vsock->pkt_list_lock);
list_add_tail(&pkt->list, &vsock->pkt_list);
spin_unlock_bh(&vsock->pkt_list_lock);
queue_work(vsock->workqueue, &vsock->pkt_work);
return len;
}
static int vsock_loopback_cancel_pkt(struct vsock_sock *vsk)
{
struct vsock_loopback *vsock = &the_vsock_loopback;
struct virtio_vsock_pkt *pkt, *n;
LIST_HEAD(freeme);
spin_lock_bh(&vsock->pkt_list_lock);
list_for_each_entry_safe(pkt, n, &vsock->pkt_list, list) {
if (pkt->vsk != vsk)
continue;
list_move(&pkt->list, &freeme);
}
spin_unlock_bh(&vsock->pkt_list_lock);
list_for_each_entry_safe(pkt, n, &freeme, list) {
list_del(&pkt->list);
virtio_transport_free_pkt(pkt);
}
return 0;
}
static struct virtio_transport loopback_transport = {
.transport = {
.module = THIS_MODULE,
.get_local_cid = vsock_loopback_get_local_cid,
.init = virtio_transport_do_socket_init,
.destruct = virtio_transport_destruct,
.release = virtio_transport_release,
.connect = virtio_transport_connect,
.shutdown = virtio_transport_shutdown,
.cancel_pkt = vsock_loopback_cancel_pkt,
.dgram_bind = virtio_transport_dgram_bind,
.dgram_dequeue = virtio_transport_dgram_dequeue,
.dgram_enqueue = virtio_transport_dgram_enqueue,
.dgram_allow = virtio_transport_dgram_allow,
.stream_dequeue = virtio_transport_stream_dequeue,
.stream_enqueue = virtio_transport_stream_enqueue,
.stream_has_data = virtio_transport_stream_has_data,
.stream_has_space = virtio_transport_stream_has_space,
.stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
.stream_is_active = virtio_transport_stream_is_active,
.stream_allow = virtio_transport_stream_allow,
.notify_poll_in = virtio_transport_notify_poll_in,
.notify_poll_out = virtio_transport_notify_poll_out,
.notify_recv_init = virtio_transport_notify_recv_init,
.notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
.notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
.notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
.notify_send_init = virtio_transport_notify_send_init,
.notify_send_pre_block = virtio_transport_notify_send_pre_block,
.notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
.notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
.notify_buffer_size = virtio_transport_notify_buffer_size,
},
.send_pkt = vsock_loopback_send_pkt,
};
static void vsock_loopback_work(struct work_struct *work)
{
struct vsock_loopback *vsock =
container_of(work, struct vsock_loopback, pkt_work);
LIST_HEAD(pkts);
spin_lock_bh(&vsock->pkt_list_lock);
list_splice_init(&vsock->pkt_list, &pkts);
spin_unlock_bh(&vsock->pkt_list_lock);
while (!list_empty(&pkts)) {
struct virtio_vsock_pkt *pkt;
pkt = list_first_entry(&pkts, struct virtio_vsock_pkt, list);
list_del_init(&pkt->list);
virtio_transport_deliver_tap_pkt(pkt);
virtio_transport_recv_pkt(&loopback_transport, pkt);
}
}
static int __init vsock_loopback_init(void)
{
struct vsock_loopback *vsock = &the_vsock_loopback;
int ret;
vsock->workqueue = alloc_workqueue("vsock-loopback", 0, 0);
if (!vsock->workqueue)
return -ENOMEM;
spin_lock_init(&vsock->pkt_list_lock);
INIT_LIST_HEAD(&vsock->pkt_list);
INIT_WORK(&vsock->pkt_work, vsock_loopback_work);
ret = vsock_core_register(&loopback_transport.transport,
VSOCK_TRANSPORT_F_LOCAL);
if (ret)
goto out_wq;
return 0;
out_wq:
destroy_workqueue(vsock->workqueue);
return ret;
}
static void __exit vsock_loopback_exit(void)
{
struct vsock_loopback *vsock = &the_vsock_loopback;
struct virtio_vsock_pkt *pkt;
vsock_core_unregister(&loopback_transport.transport);
flush_work(&vsock->pkt_work);
spin_lock_bh(&vsock->pkt_list_lock);
while (!list_empty(&vsock->pkt_list)) {
pkt = list_first_entry(&vsock->pkt_list,
struct virtio_vsock_pkt, list);
list_del(&pkt->list);
virtio_transport_free_pkt(pkt);
}
spin_unlock_bh(&vsock->pkt_list_lock);
destroy_workqueue(vsock->workqueue);
}
module_init(vsock_loopback_init);
module_exit(vsock_loopback_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Stefano Garzarella <sgarzare@redhat.com>");
MODULE_DESCRIPTION("loopback transport for vsock");
MODULE_ALIAS_NETPROTO(PF_VSOCK);