This patch series adds a virtio transport for AF_VSOCK (net/vmw_vsock/).
AF_VSOCK is designed for communication between virtual machines and
hypervisors. It is currently only implemented for VMware's VMCI transport.
This series implements the proposed virtio-vsock device specification from
here:
http://comments.gmane.org/gmane.comp.emulators.virtio.devel/855
Most of the work was done by Asias He and Gerd Hoffmann a while back. I have
picked up the series again.
The QEMU userspace changes are here:
https://github.com/stefanha/qemu/commits/vsock
Why virtio-vsock?
-----------------
Guest<->host communication is currently done over the virtio-serial
device.
This makes it hard to port sockets API-based applications and is limited to
static ports.
virtio-vsock uses the sockets API so that applications can rely on familiar
SOCK_STREAM and SOCK_DGRAM semantics. Applications on the host can easily
connect to guest agents because the sockets API allows multiple connections to
a listen socket (unlike virtio-serial). This simplifies the guest<->host
communication and eliminates the need for extra processes on the host to
arbitrate virtio-serial ports.
Overview
--------
This series adds 3 pieces:
1. virtio_transport_common.ko - core virtio vsock code that uses vsock.ko
2. virtio_transport.ko - guest driver
3. drivers/vhost/vsock.ko - host driver
Howto
-----
The following kernel options are needed:
CONFIG_VSOCKETS=y
CONFIG_VIRTIO_VSOCKETS=y
CONFIG_VIRTIO_VSOCKETS_COMMON=y
CONFIG_VHOST_VSOCK=m
Launch QEMU as follows:
# qemu ... -device vhost-vsock-pci,id=vhost-vsock-pci0
Guest and host can communicate via AF_VSOCK sockets. The host's CID
(address)
is 2 and the guest is automatically assigned a CID (use VMADDR_CID_ANY (-1) to
bind to it).
Status
------
I am auditing and testing the code, while iterating the virtio device
specification. There is scope to change both the implementation (these
patches) and the virtio device specification.
TODO:
* Flexible virtqueue descriptor layout
* Avoid Linux-specific constants in packet headers (SOCK_STREAM/SOCK_DGRAM)
* Send RST if there is no listening SOCK_STREAM socket
* Add missing input validation for packet headers and vhost ioctls
Asias He (6):
VSOCK: Introduce vsock_find_unbound_socket and
vsock_bind_dgram_generic
Add dgram_skb to vsock_sock
VSOCK: Introduce virtio-vsock-common.ko
VSOCK: Introduce virtio-vsock.ko
VSOCK: Introduce vhost-vsock.ko
VSOCK: Add Makefile and Kconfig
drivers/vhost/Kconfig | 4 +
drivers/vhost/Kconfig.vsock | 7 +
drivers/vhost/Makefile | 4 +
drivers/vhost/vsock.c | 596 +++++++++++++++
drivers/vhost/vsock.h | 4 +
include/linux/virtio_vsock.h | 207 +++++
include/net/af_vsock.h | 3 +
include/uapi/linux/virtio_ids.h | 1 +
include/uapi/linux/virtio_vsock.h | 80 ++
net/vmw_vsock/Kconfig | 18 +
net/vmw_vsock/Makefile | 2 +
net/vmw_vsock/af_vsock.c | 71 ++
net/vmw_vsock/virtio_transport.c | 450 +++++++++++
net/vmw_vsock/virtio_transport_common.c | 1248 +++++++++++++++++++++++++++++++
14 files changed, 2695 insertions(+)
create mode 100644 drivers/vhost/Kconfig.vsock
create mode 100644 drivers/vhost/vsock.c
create mode 100644 drivers/vhost/vsock.h
create mode 100644 include/linux/virtio_vsock.h
create mode 100644 include/uapi/linux/virtio_vsock.h
create mode 100644 net/vmw_vsock/virtio_transport.c
create mode 100644 net/vmw_vsock/virtio_transport_common.c
--
2.4.1
Stefan Hajnoczi
2015-May-27 17:05 UTC
[RFC 1/6] VSOCK: Introduce vsock_find_unbound_socket and vsock_bind_dgram_generic
From: Asias He <asias at redhat.com>
Signed-off-by: Asias He <asias at redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha at redhat.com>
---
include/net/af_vsock.h | 2 ++
net/vmw_vsock/af_vsock.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 72 insertions(+)
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index 172632d..d52b984 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -172,8 +172,10 @@ void vsock_insert_connected(struct vsock_sock *vsk);
void vsock_remove_bound(struct vsock_sock *vsk);
void vsock_remove_connected(struct vsock_sock *vsk);
struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
+struct sock *vsock_find_unbound_socket(struct sockaddr_vm *addr);
struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst);
void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
+int vsock_bind_dgram_generic(struct vsock_sock *vsk, struct sockaddr_vm *addr);
#endif /* __AF_VSOCK_H__ */
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 2ec86e6..ae3ce3d 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -224,6 +224,17 @@ static struct sock *__vsock_find_bound_socket(struct
sockaddr_vm *addr)
return NULL;
}
+static struct sock *__vsock_find_unbound_socket(struct sockaddr_vm *addr)
+{
+ struct vsock_sock *vsk;
+
+ list_for_each_entry(vsk, vsock_unbound_sockets, bound_table)
+ if (addr->svm_port == vsk->local_addr.svm_port)
+ return sk_vsock(vsk);
+
+ return NULL;
+}
+
static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst)
{
@@ -299,6 +310,21 @@ struct sock *vsock_find_bound_socket(struct sockaddr_vm
*addr)
}
EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
+struct sock *vsock_find_unbound_socket(struct sockaddr_vm *addr)
+{
+ struct sock *sk;
+
+ spin_lock_bh(&vsock_table_lock);
+ sk = __vsock_find_unbound_socket(addr);
+ if (sk)
+ sock_hold(sk);
+
+ spin_unlock_bh(&vsock_table_lock);
+
+ return sk;
+}
+EXPORT_SYMBOL_GPL(vsock_find_unbound_socket);
+
struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst)
{
@@ -533,6 +559,50 @@ static int __vsock_bind_stream(struct vsock_sock *vsk,
return 0;
}
+int vsock_bind_dgram_generic(struct vsock_sock *vsk, struct sockaddr_vm *addr)
+{
+ static u32 port = LAST_RESERVED_PORT + 1;
+ struct sockaddr_vm new_addr;
+
+ vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
+
+ if (addr->svm_port == VMADDR_PORT_ANY) {
+ bool found = false;
+ unsigned int i;
+
+ for (i = 0; i < MAX_PORT_RETRIES; i++) {
+ if (port <= LAST_RESERVED_PORT)
+ port = LAST_RESERVED_PORT + 1;
+
+ new_addr.svm_port = port++;
+
+ if (!__vsock_find_unbound_socket(&new_addr)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ return -EADDRNOTAVAIL;
+ } else {
+ /* If port is in reserved range, ensure caller
+ * has necessary privileges.
+ */
+ if (addr->svm_port <= LAST_RESERVED_PORT &&
+ !capable(CAP_NET_BIND_SERVICE)) {
+ return -EACCES;
+ }
+
+ if (__vsock_find_unbound_socket(&new_addr))
+ return -EADDRINUSE;
+ }
+
+ vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vsock_bind_dgram_generic);
+
static int __vsock_bind_dgram(struct vsock_sock *vsk,
struct sockaddr_vm *addr)
{
--
2.4.1
From: Asias He <asias at redhat.com>
This list will be used to match received packets when multiple packets
are used because datagram size is larger than the receive buffer size.
Signed-off-by: Stefan Hajnoczi <stefanha at redhat.com>
---
include/net/af_vsock.h | 1 +
net/vmw_vsock/af_vsock.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index d52b984..bc9055c 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -58,6 +58,7 @@ struct vsock_sock {
*/
struct list_head pending_links;
struct list_head accept_queue;
+ struct list_head dgram_skb;
bool rejected;
struct delayed_work dwork;
u32 peer_shutdown;
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index ae3ce3d..0b3c498 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -684,6 +684,7 @@ struct sock *__vsock_create(struct net *net,
vsk->listener = NULL;
INIT_LIST_HEAD(&vsk->pending_links);
INIT_LIST_HEAD(&vsk->accept_queue);
+ INIT_LIST_HEAD(&vsk->dgram_skb); /* TODO free list entries on shutdown
and limit list size or timeout somehow? */
vsk->rejected = false;
vsk->sent_request = false;
vsk->ignore_connecting_rst = false;
--
2.4.1
From: Asias He <asias at redhat.com>
This module contains the common code and header files for the following
virtio-vsock and virtio-vhost kernel modules.
Signed-off-by: Asias He <asias at redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha at redhat.com>
---
include/linux/virtio_vsock.h | 207 +++++
include/uapi/linux/virtio_ids.h | 1 +
include/uapi/linux/virtio_vsock.h | 80 ++
net/vmw_vsock/virtio_transport_common.c | 1248 +++++++++++++++++++++++++++++++
4 files changed, 1536 insertions(+)
create mode 100644 include/linux/virtio_vsock.h
create mode 100644 include/uapi/linux/virtio_vsock.h
create mode 100644 net/vmw_vsock/virtio_transport_common.c
diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
new file mode 100644
index 0000000..01d84a5
--- /dev/null
+++ b/include/linux/virtio_vsock.h
@@ -0,0 +1,207 @@
+/*
+ * This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
+ * anyone can use the definitions to implement compatible drivers/servers:
+ *
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of IBM nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Copyright (C) Red Hat, Inc., 2013-2015
+ * Copyright (C) Asias He <asias at redhat.com>, 2013
+ * Copyright (C) Stefan Hajnoczi <stefanha at redhat.com>, 2015
+ */
+
+#ifndef _LINUX_VIRTIO_VSOCK_H
+#define _LINUX_VIRTIO_VSOCK_H
+
+#include <uapi/linux/virtio_vsock.h>
+#include <linux/socket.h>
+#include <net/sock.h>
+
+#define VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE 128
+#define VIRTIO_VSOCK_DEFAULT_BUF_SIZE (1024 * 256)
+#define VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE (1024 * 256)
+#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4)
+#define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL
+#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64)
+#define VIRTIO_VSOCK_MAX_TX_BUF_SIZE (1024 * 1024 * 16)
+#define VIRTIO_VSOCK_MAX_DGRAM_SIZE (1024 * 64)
+
+struct vsock_transport_recv_notify_data;
+struct vsock_transport_send_notify_data;
+struct sockaddr_vm;
+struct vsock_sock;
+
+enum {
+ VSOCK_VQ_CTRL = 0,
+ VSOCK_VQ_RX = 1, /* for host to guest data */
+ VSOCK_VQ_TX = 2, /* for guest to host data */
+ VSOCK_VQ_MAX = 3,
+};
+
+/* virtio transport socket state */
+struct virtio_transport {
+ struct virtio_transport_pkt_ops *ops;
+ struct vsock_sock *vsk;
+
+ u32 buf_size;
+ u32 buf_size_min;
+ u32 buf_size_max;
+
+ struct mutex tx_lock;
+ struct mutex rx_lock;
+
+ struct list_head rx_queue;
+ u32 rx_bytes;
+
+ /* Protected by trans->tx_lock */
+ u32 tx_cnt;
+ u32 buf_alloc;
+ u32 peer_fwd_cnt;
+ u32 peer_buf_alloc;
+ /* Protected by trans->rx_lock */
+ u32 fwd_cnt;
+
+ u16 dgram_id;
+};
+
+struct virtio_vsock_pkt {
+ struct virtio_vsock_hdr hdr;
+ struct virtio_transport *trans;
+ struct work_struct work;
+ struct list_head list;
+ void *buf;
+ u32 len;
+ u32 off;
+};
+
+struct virtio_vsock_pkt_info {
+ u32 remote_cid, remote_port;
+ struct msghdr *msg;
+ u32 pkt_len;
+ u16 type;
+ u16 op;
+ u32 flags;
+ u16 dgram_id;
+ u16 dgram_len;
+};
+
+struct virtio_transport_pkt_ops {
+ int (*send_pkt)(struct vsock_sock *vsk,
+ struct virtio_vsock_pkt_info *info);
+};
+
+void virtio_vsock_dumppkt(const char *func,
+ const struct virtio_vsock_pkt *pkt);
+
+struct sock *
+virtio_transport_get_pending(struct sock *listener,
+ struct virtio_vsock_pkt *pkt);
+struct virtio_vsock_pkt *
+virtio_transport_alloc_pkt(struct vsock_sock *vsk,
+ struct virtio_vsock_pkt_info *info,
+ size_t len,
+ u32 src_cid,
+ u32 src_port,
+ u32 dst_cid,
+ u32 dst_port);
+ssize_t
+virtio_transport_stream_dequeue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len,
+ int type);
+int
+virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len, int flags);
+
+s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
+s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
+
+int virtio_transport_do_socket_init(struct vsock_sock *vsk,
+ struct vsock_sock *psk);
+u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk);
+u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk);
+u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk);
+void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val);
+void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val);
+void virtio_transport_set_max_buffer_size(struct vsock_sock *vs, u64 val);
+int
+virtio_transport_notify_poll_in(struct vsock_sock *vsk,
+ size_t target,
+ bool *data_ready_now);
+int
+virtio_transport_notify_poll_out(struct vsock_sock *vsk,
+ size_t target,
+ bool *space_available_now);
+
+int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data);
+int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data);
+int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data);
+int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
+ size_t target, ssize_t copied, bool data_read,
+ struct vsock_transport_recv_notify_data *data);
+int virtio_transport_notify_send_init(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data);
+int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data);
+int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data);
+int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
+ ssize_t written, struct vsock_transport_send_notify_data *data);
+
+u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk);
+bool virtio_transport_stream_is_active(struct vsock_sock *vsk);
+bool virtio_transport_stream_allow(u32 cid, u32 port);
+int virtio_transport_dgram_bind(struct vsock_sock *vsk,
+ struct sockaddr_vm *addr);
+bool virtio_transport_dgram_allow(u32 cid, u32 port);
+
+int virtio_transport_connect(struct vsock_sock *vsk);
+
+int virtio_transport_shutdown(struct vsock_sock *vsk, int mode);
+
+void virtio_transport_release(struct vsock_sock *vsk);
+
+ssize_t
+virtio_transport_stream_enqueue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len);
+int
+virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
+ struct sockaddr_vm *remote_addr,
+ struct msghdr *msg,
+ size_t len);
+
+void virtio_transport_destruct(struct vsock_sock *vsk);
+
+void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt);
+void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt);
+void virtio_transport_inc_tx_pkt(struct virtio_vsock_pkt *pkt);
+void virtio_transport_dec_tx_pkt(struct virtio_vsock_pkt *pkt);
+u32 virtio_transport_get_credit(struct virtio_transport *trans, u32 wanted);
+void virtio_transport_put_credit(struct virtio_transport *trans, u32 credit);
+#endif /* _LINUX_VIRTIO_VSOCK_H */
diff --git a/include/uapi/linux/virtio_ids.h b/include/uapi/linux/virtio_ids.h
index 5f60aa4..6d579c5 100644
--- a/include/uapi/linux/virtio_ids.h
+++ b/include/uapi/linux/virtio_ids.h
@@ -39,6 +39,7 @@
#define VIRTIO_ID_9P 9 /* 9p virtio console */
#define VIRTIO_ID_RPROC_SERIAL 11 /* virtio remoteproc serial link */
#define VIRTIO_ID_CAIF 12 /* Virtio caif */
+#define VIRTIO_ID_VSOCK 13 /* virtio vsock transport */
#define VIRTIO_ID_INPUT 18 /* virtio input */
#endif /* _LINUX_VIRTIO_IDS_H */
diff --git a/include/uapi/linux/virtio_vsock.h
b/include/uapi/linux/virtio_vsock.h
new file mode 100644
index 0000000..090afdd
--- /dev/null
+++ b/include/uapi/linux/virtio_vsock.h
@@ -0,0 +1,80 @@
+/*
+ * This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
+ * anyone can use the definitions to implement compatible drivers/servers:
+ *
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of IBM nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Copyright (C) Red Hat, Inc., 2013-2015
+ * Copyright (C) Asias He <asias at redhat.com>, 2013
+ * Copyright (C) Stefan Hajnoczi <stefanha at redhat.com>, 2015
+ */
+
+#ifndef _UAPI_LINUX_VIRTIO_VSOCK_H
+#define _UAPI_LINUX_VIRTIO_VOSCK_H
+
+#include <linux/types.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+
+struct virtio_vsock_config {
+ __le32 guest_cid;
+ __le32 max_virtqueue_pairs;
+};
+
+struct virtio_vsock_hdr {
+ __le32 src_cid;
+ __le32 src_port;
+ __le32 dst_cid;
+ __le32 dst_port;
+ __le32 len;
+ /* type can be SOCK_STREAM or SOCK_DGRAM */
+ __le16 type;
+ /* operations of the pkt */
+ __le16 op;
+ __le32 flags;
+ __le32 buf_alloc;
+ __le32 fwd_cnt;
+};
+
+enum {
+ VIRTIO_VSOCK_OP_INVALID = 0,
+
+ /* Connect operations */
+ VIRTIO_VSOCK_OP_REQUEST = 1,
+ VIRTIO_VSOCK_OP_RESPONSE = 2,
+ VIRTIO_VSOCK_OP_ACK = 3,
+ VIRTIO_VSOCK_OP_RST = 4,
+ VIRTIO_VSOCK_OP_SHUTDOWN = 5,
+
+ /* To send payload */
+ VIRTIO_VSOCK_OP_RW = 6,
+
+ /* Tell the peer our credit info */
+ VIRTIO_VSOCK_OP_CREDIT_UPDATE = 7,
+ /* Request the peer to send the credit info to us */
+ VIRTIO_VSOCK_OP_CREDIT_REQUEST = 8,
+};
+
+#endif /* _UAPI_LINUX_VIRTIO_VSOCK_H */
diff --git a/net/vmw_vsock/virtio_transport_common.c
b/net/vmw_vsock/virtio_transport_common.c
new file mode 100644
index 0000000..1153d29
--- /dev/null
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -0,0 +1,1248 @@
+/*
+ * common code for virtio vsock
+ *
+ * Copyright (C) 2013-2015 Red Hat, Inc.
+ * Author: Asias He <asias at redhat.com>
+ * Stefan Hajnoczi <stefanha at redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/list.h>
+#include <linux/virtio.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_vsock.h>
+#include <linux/random.h>
+#include <linux/cryptohash.h>
+
+#include <net/sock.h>
+#include <net/af_vsock.h>
+
+#define SS_LISTEN 255
+
+#define COOKIEBITS 24
+#define COOKIEMASK (((u32)1 << COOKIEBITS) - 1)
+#define VSOCK_TIMEOUT_INIT 4
+
+#define SHA_MESSAGE_WORDS 16
+#define SHA_VSOCK_WORDS 5
+
+static u32 vsockcookie_secret[2][SHA_MESSAGE_WORDS - SHA_VSOCK_WORDS +
+ SHA_DIGEST_WORDS];
+
+static DEFINE_PER_CPU(__u32[SHA_MESSAGE_WORDS + SHA_DIGEST_WORDS +
+ SHA_WORKSPACE_WORDS], vsock_cookie_scratch);
+
+static u32 cookie_hash(u32 saddr, u32 daddr, u16 sport, u16 dport,
+ u32 count, int c)
+{
+ __u32 *tmp = this_cpu_ptr(vsock_cookie_scratch);
+
+ memcpy(tmp + SHA_VSOCK_WORDS, vsockcookie_secret[c],
+ sizeof(vsockcookie_secret[c]));
+ tmp[0] = saddr;
+ tmp[1] = daddr;
+ tmp[2] = sport;
+ tmp[3] = dport;
+ tmp[4] = count;
+ sha_transform(tmp + SHA_MESSAGE_WORDS, (__u8 *)tmp,
+ tmp + SHA_MESSAGE_WORDS + SHA_DIGEST_WORDS);
+
+ return tmp[17];
+}
+
+static u32
+virtio_vsock_secure_cookie(u32 saddr, u32 daddr, u32 sport, u32 dport,
+ u32 count)
+{
+ u32 h1, h2;
+
+ h1 = cookie_hash(saddr, daddr, sport, dport, 0, 0);
+ h2 = cookie_hash(saddr, daddr, sport, dport, count, 1);
+
+ return h1 + (count << COOKIEBITS) + (h2 & COOKIEMASK);
+}
+
+static u32
+virtio_vsock_check_cookie(u32 saddr, u32 daddr, u32 sport, u32 dport,
+ u32 count, u32 cookie, u32 maxdiff)
+{
+ u32 diff;
+ u32 ret;
+
+ cookie -= cookie_hash(saddr, daddr, sport, dport, 0, 0);
+
+ diff = (count - (cookie >> COOKIEBITS)) & ((u32)-1 >>
COOKIEBITS);
+ pr_debug("%s: diff=%x\n", __func__, diff);
+ if (diff >= maxdiff)
+ return (u32)-1;
+
+ ret = (cookie -
+ cookie_hash(saddr, daddr, sport, dport, count - diff, 1))
+ & COOKIEMASK;
+ pr_debug("%s: ret=%x\n", __func__, diff);
+
+ return ret;
+}
+
+void virtio_vsock_dumppkt(const char *func, const struct virtio_vsock_pkt
*pkt)
+{
+ pr_debug("%s: pkt=%p, op=%d, len=%d, %d:%d---%d:%d, len=%d\n",
+ func, pkt,
+ le16_to_cpu(pkt->hdr.op),
+ le32_to_cpu(pkt->hdr.len),
+ le32_to_cpu(pkt->hdr.src_cid),
+ le32_to_cpu(pkt->hdr.src_port),
+ le32_to_cpu(pkt->hdr.dst_cid),
+ le32_to_cpu(pkt->hdr.dst_port),
+ pkt->len);
+}
+EXPORT_SYMBOL_GPL(virtio_vsock_dumppkt);
+
+struct virtio_vsock_pkt *
+virtio_transport_alloc_pkt(struct vsock_sock *vsk,
+ struct virtio_vsock_pkt_info *info,
+ size_t len,
+ u32 src_cid,
+ u32 src_port,
+ u32 dst_cid,
+ u32 dst_port)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt *pkt;
+ int err;
+
+ BUG_ON(!trans);
+
+ pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
+ if (!pkt)
+ return NULL;
+
+ pkt->hdr.type = cpu_to_le16(info->type);
+ pkt->hdr.op = cpu_to_le16(info->op);
+ pkt->hdr.src_cid = cpu_to_le32(src_cid);
+ pkt->hdr.src_port = cpu_to_le32(src_port);
+ pkt->hdr.dst_cid = cpu_to_le32(dst_cid);
+ pkt->hdr.dst_port = cpu_to_le32(dst_port);
+ pkt->hdr.flags = cpu_to_le32(info->flags);
+ pkt->len = len;
+ pkt->trans = trans;
+ if (info->type == SOCK_DGRAM)
+ pkt->hdr.len = cpu_to_le32(len + (info->dgram_len << 16));
+ else if (info->type == SOCK_STREAM)
+ pkt->hdr.len = cpu_to_le32(len);
+
+ if (info->msg && len > 0) {
+ pkt->buf = kmalloc(len, GFP_KERNEL);
+ if (!pkt->buf)
+ goto out_pkt;
+ err = memcpy_from_msg(pkt->buf, info->msg, len);
+ if (err)
+ goto out;
+ }
+
+ return pkt;
+
+out:
+ kfree(pkt->buf);
+out_pkt:
+ kfree(pkt);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_alloc_pkt);
+
+struct sock *
+virtio_transport_get_pending(struct sock *listener,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct vsock_sock *vlistener;
+ struct vsock_sock *vpending;
+ struct sockaddr_vm src;
+ struct sockaddr_vm dst;
+ struct sock *pending;
+
+ vsock_addr_init(&src, le32_to_cpu(pkt->hdr.src_cid),
le32_to_cpu(pkt->hdr.src_port));
+ vsock_addr_init(&dst, le32_to_cpu(pkt->hdr.dst_cid),
le32_to_cpu(pkt->hdr.dst_port));
+
+ vlistener = vsock_sk(listener);
+ list_for_each_entry(vpending, &vlistener->pending_links,
+ pending_links) {
+ if (vsock_addr_equals_addr(&src, &vpending->remote_addr)
&&
+ vsock_addr_equals_addr(&dst, &vpending->local_addr)) {
+ pending = sk_vsock(vpending);
+ sock_hold(pending);
+ return pending;
+ }
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_get_pending);
+
+static void virtio_transport_inc_rx_pkt(struct virtio_vsock_pkt *pkt)
+{
+ pkt->trans->rx_bytes += pkt->len;
+}
+
+static void virtio_transport_dec_rx_pkt(struct virtio_vsock_pkt *pkt)
+{
+ pkt->trans->rx_bytes -= pkt->len;
+ pkt->trans->fwd_cnt += pkt->len;
+}
+
+void virtio_transport_inc_tx_pkt(struct virtio_vsock_pkt *pkt)
+{
+ mutex_lock(&pkt->trans->tx_lock);
+ pkt->hdr.fwd_cnt = cpu_to_le32(pkt->trans->fwd_cnt);
+ pkt->hdr.buf_alloc = cpu_to_le32(pkt->trans->buf_alloc);
+ mutex_unlock(&pkt->trans->tx_lock);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
+
+void virtio_transport_dec_tx_pkt(struct virtio_vsock_pkt *pkt)
+{
+}
+EXPORT_SYMBOL_GPL(virtio_transport_dec_tx_pkt);
+
+u32 virtio_transport_get_credit(struct virtio_transport *trans, u32 credit)
+{
+ u32 ret;
+
+ mutex_lock(&trans->tx_lock);
+ ret = trans->peer_buf_alloc - (trans->tx_cnt - trans->peer_fwd_cnt);
+ if (ret > credit)
+ ret = credit;
+ trans->tx_cnt += ret;
+ mutex_unlock(&trans->tx_lock);
+
+ pr_debug("%s: ret=%d, buf_alloc=%d, peer_buf_alloc=%d,"
+ "tx_cnt=%d, fwd_cnt=%d, peer_fwd_cnt=%d\n", __func__,
+ ret, trans->buf_alloc, trans->peer_buf_alloc,
+ trans->tx_cnt, trans->fwd_cnt, trans->peer_fwd_cnt);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
+
+void virtio_transport_put_credit(struct virtio_transport *trans, u32 credit)
+{
+ mutex_lock(&trans->tx_lock);
+ trans->tx_cnt -= credit;
+ mutex_unlock(&trans->tx_lock);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
+
+static int virtio_transport_send_credit_update(struct vsock_sock *vsk, int
type, struct virtio_vsock_hdr *hdr)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
+ .type = type,
+ };
+
+ if (hdr && type == SOCK_DGRAM) {
+ info.remote_cid = le32_to_cpu(hdr->src_cid);
+ info.remote_port = le32_to_cpu(hdr->src_port);
+ }
+
+ pr_debug("%s: sk=%p send_credit_update\n", __func__, vsk);
+ return trans->ops->send_pkt(vsk, &info);
+}
+
+static int virtio_transport_send_credit_request(struct vsock_sock *vsk, int
type)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_CREDIT_REQUEST,
+ .type = type,
+ };
+
+ pr_debug("%s: sk=%p send_credit_request\n", __func__, vsk);
+ return trans->ops->send_pkt(vsk, &info);
+}
+
+static ssize_t
+virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt *pkt;
+ size_t bytes, total = 0;
+ int err = -EFAULT;
+
+ mutex_lock(&trans->rx_lock);
+ while (total < len && trans->rx_bytes > 0 &&
+ !list_empty(&trans->rx_queue)) {
+ pkt = list_first_entry(&trans->rx_queue,
+ struct virtio_vsock_pkt, list);
+
+ bytes = len - total;
+ if (bytes > pkt->len - pkt->off)
+ bytes = pkt->len - pkt->off;
+
+ err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes);
+ if (err)
+ goto out;
+ total += bytes;
+ pkt->off += bytes;
+ if (pkt->off == pkt->len) {
+ virtio_transport_dec_rx_pkt(pkt);
+ list_del(&pkt->list);
+ virtio_transport_free_pkt(pkt);
+ }
+ }
+ mutex_unlock(&trans->rx_lock);
+
+ /* Send a credit pkt to peer */
+ virtio_transport_send_credit_update(vsk, SOCK_STREAM, NULL);
+
+ return total;
+
+out:
+ mutex_unlock(&trans->rx_lock);
+ if (total)
+ err = total;
+ return err;
+}
+
+ssize_t
+virtio_transport_stream_dequeue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len, int flags)
+{
+ if (flags & MSG_PEEK)
+ return -EOPNOTSUPP;
+
+ return virtio_transport_stream_do_dequeue(vsk, msg, len);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
+
+struct dgram_skb {
+ struct list_head list;
+ struct sk_buff *skb;
+ u16 id;
+};
+
+static struct dgram_skb *dgram_id_to_skb(struct vsock_sock *vsk, u16 id)
+{
+ struct dgram_skb *p;
+
+ list_for_each_entry(p, &vsk->dgram_skb, list) {
+ if (p->id == id)
+ return p;
+ }
+
+ return NULL;
+}
+
+static void
+virtio_transport_recv_dgram(struct sock *sk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct sk_buff *skb = NULL;
+ struct vsock_sock *vsk;
+ size_t size;
+ u16 dgram_id, pkt_off, dgram_len, pkt_len;
+ u32 flags, len;
+ struct dgram_skb *dgram_skb;
+
+ vsk = vsock_sk(sk);
+
+ /* len: dgram_len | pkt_len */
+ len = le32_to_cpu(pkt->hdr.len);
+ dgram_len = len >> 16;
+ pkt_len = len & 0xFFFF;
+
+ /* flags: dgram_id | pkt_off */
+ flags = le32_to_cpu(pkt->hdr.flags);
+ dgram_id = flags >> 16;
+ pkt_off = flags & 0xFFFF;
+
+ pr_debug("%s: dgram_len=%d, pkt_len=%d, id=%d, off=%d\n", __func__,
+ dgram_len, pkt_len, dgram_id, pkt_off);
+
+ dgram_skb = dgram_id_to_skb(vsk, dgram_id);
+ if (dgram_skb) {
+ /* This pkt is for a existing dgram */
+ skb = dgram_skb->skb;
+ pr_debug("%s:found skb\n", __func__);
+ }
+
+ /* Packet payload must be within datagram bounds */
+ if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
+ goto drop;
+ if (pkt_len > dgram_len)
+ goto drop;
+ if (pkt_off > dgram_len)
+ goto drop;
+ if (dgram_len - pkt_off < pkt_len)
+ goto drop;
+
+ if (!skb) {
+ /* This pkt is for a new dgram */
+ pr_debug("%s:create skb\n", __func__);
+
+ size = sizeof(pkt->hdr) + dgram_len;
+ /* Attach the packet to the socket's receive queue as an sk_buff. */
+ dgram_skb = kzalloc(sizeof(struct dgram_skb), GFP_ATOMIC);
+ if (!dgram_skb)
+ goto drop;
+
+ skb = alloc_skb(size, GFP_ATOMIC);
+ if (!skb) {
+ kfree(dgram_skb);
+ dgram_skb = NULL;
+ goto drop;
+ }
+ dgram_skb->id = dgram_id;
+ dgram_skb->skb = skb;
+ list_add_tail(&dgram_skb->list, &vsk->dgram_skb);
+
+ /* sk_receive_skb() will do a sock_put(), so hold here. */
+ sock_hold(sk);
+ skb_put(skb, size);
+ memcpy(skb->data, &pkt->hdr, sizeof(pkt->hdr));
+ }
+
+ memcpy(skb->data + sizeof(pkt->hdr) + pkt_off, pkt->buf, pkt_len);
+
+ pr_debug("%s:C, off=%d, pkt_len=%d, dgram_len=%d\n", __func__,
+ pkt_off, pkt_len, dgram_len);
+
+ /* We are done with this dgram */
+ if (pkt_off + pkt_len == dgram_len) {
+ pr_debug("%s:dgram_id=%d is done\n", __func__, dgram_id);
+ list_del(&dgram_skb->list);
+ kfree(dgram_skb);
+ sk_receive_skb(sk, skb, 0);
+ }
+ virtio_transport_free_pkt(pkt);
+ return;
+
+drop:
+ if (dgram_skb) {
+ list_del(&dgram_skb->list);
+ kfree(dgram_skb);
+ kfree_skb(skb);
+ sock_put(sk);
+ }
+ virtio_transport_free_pkt(pkt);
+}
+
+int
+virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len, int flags)
+{
+ struct virtio_vsock_hdr *hdr;
+ struct sk_buff *skb;
+ int noblock;
+ int err;
+ int dgram_len;
+
+ noblock = flags & MSG_DONTWAIT;
+
+ if (flags & MSG_OOB || flags & MSG_ERRQUEUE)
+ return -EOPNOTSUPP;
+
+ msg->msg_namelen = 0;
+
+ /* Retrieve the head sk_buff from the socket's receive queue. */
+ err = 0;
+ skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err);
+ if (err)
+ return err;
+ if (!skb)
+ return -EAGAIN;
+
+ hdr = (struct virtio_vsock_hdr *)skb->data;
+ if (!hdr)
+ goto out;
+
+ dgram_len = le32_to_cpu(hdr->len) >> 16;
+ /* Place the datagram payload in the user's iovec. */
+ err = skb_copy_datagram_msg(skb, sizeof(*hdr), msg, dgram_len);
+ if (err)
+ goto out;
+
+ if (msg->msg_name) {
+ struct sockaddr_vm *vm_addr;
+
+ /* Provide the address of the sender. */
+ vm_addr = (struct sockaddr_vm *)msg->msg_name;
+ vsock_addr_init(vm_addr, le32_to_cpu(hdr->src_cid),
le32_to_cpu(hdr->src_port));
+ msg->msg_namelen = sizeof(*vm_addr);
+ }
+ err = dgram_len;
+
+ /* Send a credit pkt to peer */
+ virtio_transport_send_credit_update(vsk, SOCK_DGRAM, hdr);
+
+ pr_debug("%s:done, recved =%d\n", __func__, dgram_len);
+out:
+ skb_free_datagram(&vsk->sk, skb);
+ return err;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue);
+
+s64 virtio_transport_stream_has_data(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+ s64 bytes;
+
+ mutex_lock(&trans->rx_lock);
+ bytes = trans->rx_bytes;
+ mutex_unlock(&trans->rx_lock);
+
+ return bytes;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data);
+
+static s64 virtio_transport_has_space(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+ s64 bytes;
+
+ bytes = trans->peer_buf_alloc - (trans->tx_cnt -
trans->peer_fwd_cnt);
+ if (bytes < 0)
+ bytes = 0;
+
+ return bytes;
+}
+
+s64 virtio_transport_stream_has_space(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+ s64 bytes;
+
+ mutex_lock(&trans->tx_lock);
+ bytes = virtio_transport_has_space(vsk);
+ mutex_unlock(&trans->tx_lock);
+
+ pr_debug("%s: bytes=%lld\n", __func__, bytes);
+
+ return bytes;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space);
+
+int virtio_transport_do_socket_init(struct vsock_sock *vsk,
+ struct vsock_sock *psk)
+{
+ struct virtio_transport *trans;
+
+ trans = kzalloc(sizeof(*trans), GFP_KERNEL);
+ if (!trans)
+ return -ENOMEM;
+
+ vsk->trans = trans;
+ trans->vsk = vsk;
+ if (psk) {
+ struct virtio_transport *ptrans = psk->trans;
+ trans->buf_size = ptrans->buf_size;
+ trans->buf_size_min = ptrans->buf_size_min;
+ trans->buf_size_max = ptrans->buf_size_max;
+ } else {
+ trans->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE;
+ trans->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE;
+ trans->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE;
+ }
+
+ trans->buf_alloc = trans->buf_size;
+ //trans->peer_buf_alloc = trans->buf_size;
+ trans->peer_fwd_cnt = 0;
+ trans->dgram_id = 0;
+
+ pr_debug("%s: trans->buf_alloc=%d\n", __func__,
trans->buf_alloc);
+
+ mutex_init(&trans->rx_lock);
+ mutex_init(&trans->tx_lock);
+ INIT_LIST_HEAD(&trans->rx_queue);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
+
+u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+
+ return trans->buf_size;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size);
+
+u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+
+ return trans->buf_size_min;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_get_min_buffer_size);
+
+u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+
+ return trans->buf_size_max;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_get_max_buffer_size);
+
+void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
+{
+ struct virtio_transport *trans = vsk->trans;
+
+ if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
+ val = VIRTIO_VSOCK_MAX_BUF_SIZE;
+ if (val < trans->buf_size_min)
+ trans->buf_size_min = val;
+ if (val > trans->buf_size_max)
+ trans->buf_size_max = val;
+ trans->buf_size = val;
+ trans->buf_alloc = val;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size);
+
+void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val)
+{
+ struct virtio_transport *trans = vsk->trans;
+
+ if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
+ val = VIRTIO_VSOCK_MAX_BUF_SIZE;
+ if (val > trans->buf_size)
+ trans->buf_size = val;
+ trans->buf_size_min = val;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_set_min_buffer_size);
+
+void virtio_transport_set_max_buffer_size(struct vsock_sock *vsk, u64 val)
+{
+ struct virtio_transport *trans = vsk->trans;
+
+ if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
+ val = VIRTIO_VSOCK_MAX_BUF_SIZE;
+ if (val < trans->buf_size)
+ trans->buf_size = val;
+ trans->buf_size_max = val;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_set_max_buffer_size);
+
+int
+virtio_transport_notify_poll_in(struct vsock_sock *vsk,
+ size_t target,
+ bool *data_ready_now)
+{
+ if (vsock_stream_has_data(vsk))
+ *data_ready_now = true;
+ else
+ *data_ready_now = false;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in);
+
+int
+virtio_transport_notify_poll_out(struct vsock_sock *vsk,
+ size_t target,
+ bool *space_avail_now)
+{
+ s64 free_space;
+
+ free_space = vsock_stream_has_space(vsk);
+ if (free_space > 0)
+ *space_avail_now = true;
+ else if (free_space == 0)
+ *space_avail_now = false;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out);
+
+int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init);
+
+int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block);
+
+int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue);
+
+int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
+ size_t target, ssize_t copied, bool data_read,
+ struct vsock_transport_recv_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue);
+
+int virtio_transport_notify_send_init(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init);
+
+int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block);
+
+int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue);
+
+int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
+ ssize_t written, struct vsock_transport_send_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue);
+
+u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+
+ return trans->buf_size;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat);
+
+bool virtio_transport_stream_is_active(struct vsock_sock *vsk)
+{
+ return true;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active);
+
+bool virtio_transport_stream_allow(u32 cid, u32 port)
+{
+ return true;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_allow);
+
+int virtio_transport_dgram_bind(struct vsock_sock *vsk,
+ struct sockaddr_vm *addr)
+{
+ return vsock_bind_dgram_generic(vsk, addr);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind);
+
+bool virtio_transport_dgram_allow(u32 cid, u32 port)
+{
+ return true;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow);
+
+int virtio_transport_connect(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_REQUEST,
+ .type = SOCK_STREAM,
+ };
+
+ pr_debug("%s: vsk=%p send_request\n", __func__, vsk);
+ return trans->ops->send_pkt(vsk, &info);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_connect);
+
+int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_SHUTDOWN,
+ .type = SOCK_STREAM,
+ .flags = mode,
+ };
+
+ pr_debug("%s: vsk=%p: send_shutdown\n", __func__, vsk);
+ return trans->ops->send_pkt(vsk, &info);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
+
+void virtio_transport_release(struct vsock_sock *vsk)
+{
+ pr_debug("%s: vsk=%p\n", __func__, vsk);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_release);
+
+int
+virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
+ struct sockaddr_vm *remote_addr,
+ struct msghdr *msg,
+ size_t dgram_len)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_RW,
+ .type = SOCK_DGRAM,
+ .msg = msg,
+ };
+ size_t total_written = 0, pkt_off = 0, written;
+ u16 dgram_id;
+
+ /* The max size of a single dgram we support is 64KB */
+ if (dgram_len > VIRTIO_VSOCK_MAX_DGRAM_SIZE)
+ return -EMSGSIZE;
+
+ info.dgram_len = dgram_len;
+ vsk->remote_addr = *remote_addr;
+
+ dgram_id = trans->dgram_id++;
+
+ /* TODO: To optimize, if we have enough credit to send the pkt already,
+ * do not ask the peer to send credit to use */
+ virtio_transport_send_credit_request(vsk, SOCK_DGRAM);
+
+ while (total_written < dgram_len) {
+ info.pkt_len = dgram_len - total_written;
+ info.flags = dgram_id << 16 | pkt_off;
+ written = trans->ops->send_pkt(vsk, &info);
+ if (written < 0)
+ return -ENOMEM;
+ if (written == 0) {
+ /* TODO: if written = 0, we need a sleep & wakeup
+ * instead of sleep */
+ pr_debug("%s: SHOULD WAIT written==0", __func__);
+ msleep(10);
+ }
+ total_written += written;
+ pkt_off += written;
+ pr_debug("%s:id=%d, dgram_len=%zu, off=%zu, total_written=%zu,
written=%zu\n",
+ __func__, dgram_id, dgram_len, pkt_off, total_written, written);
+ }
+
+ return dgram_len;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue);
+
+ssize_t
+virtio_transport_stream_enqueue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_RW,
+ .type = SOCK_STREAM,
+ .msg = msg,
+ .pkt_len = len,
+ };
+
+ return trans->ops->send_pkt(vsk, &info);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue);
+
+void virtio_transport_destruct(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+
+ pr_debug("%s: vsk=%p\n", __func__, vsk);
+ kfree(trans);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_destruct);
+
+static int virtio_transport_send_ack(struct vsock_sock *vsk, u32 cookie)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_ACK,
+ .type = SOCK_STREAM,
+ .flags = cpu_to_le32(cookie),
+ };
+
+ pr_debug("%s: sk=%p send_offer\n", __func__, vsk);
+ return trans->ops->send_pkt(vsk, &info);
+}
+
+static int virtio_transport_send_reset(struct vsock_sock *vsk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_RST,
+ .type = SOCK_STREAM,
+ };
+
+ pr_debug("%s\n", __func__);
+
+ /* Send RST only if the original pkt is not a RST pkt */
+ if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
+ return 0;
+
+ return trans->ops->send_pkt(vsk, &info);
+}
+
+static int
+virtio_transport_recv_connecting(struct sock *sk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+ int err;
+ int skerr;
+ u32 cookie;
+
+ pr_debug("%s: vsk=%p\n", __func__, vsk);
+ switch (le16_to_cpu(pkt->hdr.op)) {
+ case VIRTIO_VSOCK_OP_RESPONSE:
+ cookie = le32_to_cpu(pkt->hdr.flags);
+ pr_debug("%s: got RESPONSE and send ACK, cookie=%x\n", __func__,
cookie);
+ printk("%s: got RESPONSE and send ACK, cookie=%x\n", __func__,
cookie);
+ err = virtio_transport_send_ack(vsk, cookie);
+ if (err < 0) {
+ skerr = -err;
+ goto destroy;
+ }
+ sk->sk_state = SS_CONNECTED;
+ sk->sk_socket->state = SS_CONNECTED;
+ vsock_insert_connected(vsk);
+ sk->sk_state_change(sk);
+ break;
+ case VIRTIO_VSOCK_OP_INVALID:
+ pr_debug("%s: got invalid\n", __func__);
+ break;
+ case VIRTIO_VSOCK_OP_RST:
+ pr_debug("%s: got rst\n", __func__);
+ skerr = ECONNRESET;
+ err = 0;
+ goto destroy;
+ default:
+ pr_debug("%s: got def\n", __func__);
+ skerr = EPROTO;
+ err = -EINVAL;
+ goto destroy;
+ }
+ return 0;
+
+destroy:
+ virtio_transport_send_reset(vsk, pkt);
+ sk->sk_state = SS_UNCONNECTED;
+ sk->sk_err = skerr;
+ sk->sk_error_report(sk);
+ return err;
+}
+
+static int
+virtio_transport_recv_connected(struct sock *sk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+ struct virtio_transport *trans = vsk->trans;
+ int err = 0;
+
+ switch (le16_to_cpu(pkt->hdr.op)) {
+ case VIRTIO_VSOCK_OP_RW:
+ pkt->len = le32_to_cpu(pkt->hdr.len);
+ pkt->off = 0;
+ pkt->trans = trans;
+
+ mutex_lock(&trans->rx_lock);
+ virtio_transport_inc_rx_pkt(pkt);
+ list_add_tail(&pkt->list, &trans->rx_queue);
+ mutex_unlock(&trans->rx_lock);
+
+ sk->sk_data_ready(sk);
+ return err;
+ case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
+ sk->sk_write_space(sk);
+ break;
+ case VIRTIO_VSOCK_OP_SHUTDOWN:
+ pr_debug("%s: got shutdown\n", __func__);
+ if (le32_to_cpu(pkt->hdr.flags)) {
+ vsk->peer_shutdown |= le32_to_cpu(pkt->hdr.flags);
+ sk->sk_state_change(sk);
+ }
+ break;
+ case VIRTIO_VSOCK_OP_RST:
+ pr_debug("%s: got rst\n", __func__);
+ sock_set_flag(sk, SOCK_DONE);
+ vsk->peer_shutdown = SHUTDOWN_MASK;
+ if (vsock_stream_has_data(vsk) <= 0)
+ sk->sk_state = SS_DISCONNECTING;
+ sk->sk_state_change(sk);
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ virtio_transport_free_pkt(pkt);
+ return err;
+}
+
+static int
+virtio_transport_send_response(struct vsock_sock *vsk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_RESPONSE,
+ .type = SOCK_STREAM,
+ .remote_cid = le32_to_cpu(pkt->hdr.src_cid),
+ .remote_port = le32_to_cpu(pkt->hdr.src_port),
+ };
+ u32 cookie;
+
+ cookie = virtio_vsock_secure_cookie(le32_to_cpu(pkt->hdr.src_cid),
+ le32_to_cpu(pkt->hdr.dst_cid),
+ le32_to_cpu(pkt->hdr.src_port),
+ le32_to_cpu(pkt->hdr.dst_port),
+ jiffies / (HZ * 60));
+ info.flags = cpu_to_le32(cookie);
+
+ pr_debug("%s: send_response, cookie=%x\n", __func__,
le32_to_cpu(cookie));
+ printk("%s: send_response, cookie=%x\n", __func__,
le32_to_cpu(cookie));
+
+ return trans->ops->send_pkt(vsk, &info);
+}
+
+/* Handle server socket */
+static int
+virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+ struct vsock_sock *vpending;
+ struct sock *pending;
+ int err;
+ u32 cookie;
+
+ switch (le16_to_cpu(pkt->hdr.op)) {
+ case VIRTIO_VSOCK_OP_REQUEST:
+ err = virtio_transport_send_response(vsk, pkt);
+ if (err < 0) {
+ // FIXME vsk should be vpending
+ virtio_transport_send_reset(vsk, pkt);
+ return err;
+ }
+ break;
+ case VIRTIO_VSOCK_OP_ACK:
+ cookie = le32_to_cpu(pkt->hdr.flags);
+ err = virtio_vsock_check_cookie(le32_to_cpu(pkt->hdr.src_cid),
+ le32_to_cpu(pkt->hdr.dst_cid),
+ le32_to_cpu(pkt->hdr.src_port),
+ le32_to_cpu(pkt->hdr.dst_port),
+ jiffies / (HZ * 60),
+ le32_to_cpu(pkt->hdr.flags),
+ VSOCK_TIMEOUT_INIT);
+ pr_debug("%s: cookie=%x, err=%d\n", __func__, cookie, err);
+ printk("%s: cookie=%x, err=%d\n", __func__, cookie, err);
+ if (err)
+ return err;
+
+ /* So no pending socket are responsible for this pkt, create one */
+ pr_debug("%s: create pending\n", __func__);
+ pending = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
+ sk->sk_type);
+ if (!pending) {
+ virtio_transport_send_reset(vsk, pkt);
+ return -ENOMEM;
+ }
+ sk->sk_ack_backlog++;
+ pending->sk_state = SS_CONNECTING;
+
+ vpending = vsock_sk(pending);
+ vsock_addr_init(&vpending->local_addr,
le32_to_cpu(pkt->hdr.dst_cid),
+ le32_to_cpu(pkt->hdr.dst_port));
+ vsock_addr_init(&vpending->remote_addr,
le32_to_cpu(pkt->hdr.src_cid),
+ le32_to_cpu(pkt->hdr.src_port));
+ vsock_add_pending(sk, pending);
+
+ pr_debug("%s: get pending\n", __func__);
+ pending = virtio_transport_get_pending(sk, pkt);
+ vpending = vsock_sk(pending);
+ lock_sock(pending);
+ switch (pending->sk_state) {
+ case SS_CONNECTING:
+ if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_ACK) {
+ pr_debug("%s: op=%d != OP_ACK\n", __func__,
+ le16_to_cpu(pkt->hdr.op));
+ virtio_transport_send_reset(vpending, pkt);
+ pending->sk_err = EPROTO;
+ pending->sk_state = SS_UNCONNECTED;
+ sock_put(pending);
+ } else {
+ pending->sk_state = SS_CONNECTED;
+ vsock_insert_connected(vpending);
+
+ vsock_remove_pending(sk, pending);
+ vsock_enqueue_accept(sk, pending);
+
+ sk->sk_state_change(sk);
+ }
+ err = 0;
+ break;
+ default:
+ pr_debug("%s: sk->sk_ack_backlog=%d\n", __func__,
+ sk->sk_ack_backlog);
+ virtio_transport_send_reset(vpending, pkt);
+ err = -EINVAL;
+ break;
+ }
+ if (err < 0)
+ vsock_remove_pending(sk, pending);
+ release_sock(pending);
+
+ /* Release refcnt obtained in virtio_transport_get_pending */
+ sock_put(pending);
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+/* We are under the virtio-vsock's vsock->rx_lock or
+ * vhost-vsock's vq->mutex lock */
+void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt)
+{
+ struct virtio_transport *trans;
+ struct sockaddr_vm src, dst;
+ struct vsock_sock *vsk;
+ struct sock *sk;
+
+ vsock_addr_init(&src, le32_to_cpu(pkt->hdr.src_cid),
le32_to_cpu(pkt->hdr.src_port));
+ vsock_addr_init(&dst, le32_to_cpu(pkt->hdr.dst_cid),
le32_to_cpu(pkt->hdr.dst_port));
+
+ virtio_vsock_dumppkt(__func__, pkt);
+
+ if (le16_to_cpu(pkt->hdr.type) == SOCK_DGRAM) {
+ sk = vsock_find_unbound_socket(&dst);
+ if (!sk)
+ goto free_pkt;
+
+ vsk = vsock_sk(sk);
+ trans = vsk->trans;
+ BUG_ON(!trans);
+
+ /* TODO: need a helper for this */
+ /* buf_alloc and fwd_cnt is always included in the hdr */
+ mutex_lock(&trans->tx_lock);
+ trans->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
+ trans->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
+ if (virtio_transport_has_space(vsk))
+ sk->sk_write_space(sk);
+ mutex_unlock(&trans->tx_lock);
+
+ switch (le16_to_cpu(pkt->hdr.op)) {
+ case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
+ printk("GOT CREDIT UPDATE");
+ virtio_transport_free_pkt(pkt);
+ break;
+ case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
+ printk("GOT CREDIT REQUEST");
+ virtio_transport_send_credit_update(vsk, SOCK_DGRAM,
+ &pkt->hdr);
+ virtio_transport_free_pkt(pkt);
+ break;
+ case VIRTIO_VSOCK_OP_RW:
+ virtio_transport_recv_dgram(sk, pkt);
+ break;
+ default:
+ virtio_transport_free_pkt(pkt);
+ break;
+ }
+
+ /* Release refcnt obtained when we fetched this socket out of
+ * the unbound list.
+ */
+ sock_put(sk);
+ return;
+ } else if (le16_to_cpu(pkt->hdr.type) == SOCK_STREAM) {
+ /* The socket must be in connected or bound table
+ * otherwise send reset back
+ */
+ sk = vsock_find_connected_socket(&src, &dst);
+ if (!sk) {
+ sk = vsock_find_bound_socket(&dst);
+ if (!sk) {
+ pr_debug("%s: can not find bound_socket\n", __func__);
+ virtio_vsock_dumppkt(__func__, pkt);
+ /* Ignore this pkt instead of sending reset back */
+ /* TODO send a RST unless this packet is a RST (to avoid infinite loops) */
+ goto free_pkt;
+ }
+ }
+
+ vsk = vsock_sk(sk);
+ trans = vsk->trans;
+ BUG_ON(!trans);
+
+ /* TODO: need a helper for this */
+ /* buf_alloc and fwd_cnt is always included in the hdr */
+ mutex_lock(&trans->tx_lock);
+ trans->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
+ trans->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
+ if (virtio_transport_has_space(vsk))
+ sk->sk_write_space(sk);
+ mutex_unlock(&trans->tx_lock);
+
+ lock_sock(sk);
+ switch (sk->sk_state) {
+ case SS_LISTEN:
+ virtio_transport_recv_listen(sk, pkt);
+ virtio_transport_free_pkt(pkt);
+ break;
+ case SS_CONNECTING:
+ virtio_transport_recv_connecting(sk, pkt);
+ virtio_transport_free_pkt(pkt);
+ break;
+ case SS_CONNECTED:
+ virtio_transport_recv_connected(sk, pkt);
+ break;
+ default:
+ virtio_transport_free_pkt(pkt);
+ break;
+ }
+ release_sock(sk);
+
+ /* Release refcnt obtained when we fetched this socket out of the
+ * bound or connected list.
+ */
+ sock_put(sk);
+ }
+ return;
+
+free_pkt:
+ virtio_transport_free_pkt(pkt);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt);
+
+void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt)
+{
+ kfree(pkt->buf);
+ kfree(pkt);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_free_pkt);
+
+static int __init virtio_vsock_common_init(void)
+{
+ get_random_bytes(vsockcookie_secret, sizeof(vsockcookie_secret));
+ return 0;
+}
+
+static void __exit virtio_vsock_common_exit(void)
+{
+}
+
+module_init(virtio_vsock_common_init);
+module_exit(virtio_vsock_common_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Asias He");
+MODULE_DESCRIPTION("common code for virtio vsock");
--
2.4.1
From: Asias He <asias at redhat.com>
VM sockets virtio transport implementation. This module runs in guest
kernel.
Signed-off-by: Asias He <asias at redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha at redhat.com>
---
net/vmw_vsock/virtio_transport.c | 450 +++++++++++++++++++++++++++++++++++++++
1 file changed, 450 insertions(+)
create mode 100644 net/vmw_vsock/virtio_transport.c
diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
new file mode 100644
index 0000000..ebe1eef
--- /dev/null
+++ b/net/vmw_vsock/virtio_transport.c
@@ -0,0 +1,450 @@
+/*
+ * virtio transport for vsock
+ *
+ * Copyright (C) 2013-2015 Red Hat, Inc.
+ * Author: Asias He <asias at redhat.com>
+ * Stefan Hajnoczi <stefanha at redhat.com>
+ *
+ * Some of the code is take from Gerd Hoffmann <kraxel at
redhat.com>'s
+ * early virtio-vsock proof-of-concept bits.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/virtio.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_vsock.h>
+#include <net/sock.h>
+#include <linux/mutex.h>
+#include <net/af_vsock.h>
+
+static struct workqueue_struct *virtio_vsock_workqueue;
+static struct virtio_vsock *the_virtio_vsock;
+static void virtio_vsock_rx_fill(struct virtio_vsock *vsock);
+
+struct virtio_vsock {
+ /* Virtio device */
+ struct virtio_device *vdev;
+ /* Virtio virtqueue */
+ struct virtqueue *vqs[VSOCK_VQ_MAX];
+ /* Wait queue for send pkt */
+ wait_queue_head_t queue_wait;
+ /* Work item to send pkt */
+ struct work_struct tx_work;
+ /* Work item to recv pkt */
+ struct work_struct rx_work;
+ /* Mutex to protect send pkt*/
+ struct mutex tx_lock;
+ /* Mutex to protect recv pkt*/
+ struct mutex rx_lock;
+ /* Number of recv buffers */
+ int rx_buf_nr;
+ /* Number of max recv buffers */
+ int rx_buf_max_nr;
+ /* Used for global tx buf limitation */
+ u32 total_tx_buf;
+ /* Guest context id, just like guest ip address */
+ u32 guest_cid;
+};
+
+static struct virtio_vsock *virtio_vsock_get(void)
+{
+ return the_virtio_vsock;
+}
+
+static u32 virtio_transport_get_local_cid(void)
+{
+ struct virtio_vsock *vsock = virtio_vsock_get();
+
+ return vsock->guest_cid;
+}
+
+static int
+virtio_transport_send_pkt(struct vsock_sock *vsk,
+ struct virtio_vsock_pkt_info *info)
+{
+ u32 src_cid, src_port, dst_cid, dst_port;
+ int ret, in_sg = 0, out_sg = 0;
+ struct virtio_transport *trans;
+ struct virtio_vsock_pkt *pkt;
+ struct virtio_vsock *vsock;
+ struct scatterlist hdr, buf, *sgs[2];
+ struct virtqueue *vq;
+ u32 pkt_len = info->pkt_len;
+ DEFINE_WAIT(wait);
+
+ vsock = virtio_vsock_get();
+ if (!vsock)
+ return -ENODEV;
+
+ src_cid = virtio_transport_get_local_cid();
+ src_port = vsk->local_addr.svm_port;
+ if (!info->remote_cid) {
+ dst_cid = vsk->remote_addr.svm_cid;
+ dst_port = vsk->remote_addr.svm_port;
+ } else {
+ dst_cid = info->remote_cid;
+ dst_port = info->remote_port;
+ }
+
+ trans = vsk->trans;
+ vq = vsock->vqs[VSOCK_VQ_TX];
+
+ if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
+ pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
+ pkt_len = virtio_transport_get_credit(trans, pkt_len);
+ /* Do not send zero length OP_RW pkt*/
+ if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
+ return pkt_len;
+
+ /* Respect global tx buf limitation */
+ mutex_lock(&vsock->tx_lock);
+ while (pkt_len + vsock->total_tx_buf > VIRTIO_VSOCK_MAX_TX_BUF_SIZE) {
+ prepare_to_wait_exclusive(&vsock->queue_wait, &wait,
+ TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&vsock->tx_lock);
+ schedule();
+ mutex_lock(&vsock->tx_lock);
+ finish_wait(&vsock->queue_wait, &wait);
+ }
+ vsock->total_tx_buf += pkt_len;
+ mutex_unlock(&vsock->tx_lock);
+
+ pkt = virtio_transport_alloc_pkt(vsk, info, pkt_len,
+ src_cid, src_port,
+ dst_cid, dst_port);
+ if (!pkt) {
+ /* TODO what about decrementing total_tx_buf */
+ virtio_transport_put_credit(trans, pkt_len);
+ return -ENOMEM;
+ }
+
+ pr_debug("%s:info->pkt_len= %d\n", __func__, info->pkt_len);
+
+ /* Will be released in virtio_transport_send_pkt_work */
+ sock_hold(&trans->vsk->sk);
+ virtio_transport_inc_tx_pkt(pkt);
+
+ /* Put pkt in the virtqueue */
+ sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
+ sgs[out_sg++] = &hdr;
+ if (info->msg && info->pkt_len > 0) {
+ sg_init_one(&buf, pkt->buf, pkt->len);
+ sgs[out_sg++] = &buf;
+ }
+
+ mutex_lock(&vsock->tx_lock);
+ while ((ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt,
+ GFP_KERNEL)) < 0) {
+ prepare_to_wait_exclusive(&vsock->queue_wait, &wait,
+ TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&vsock->tx_lock);
+ schedule();
+ mutex_lock(&vsock->tx_lock);
+ finish_wait(&vsock->queue_wait, &wait);
+ }
+ virtqueue_kick(vq);
+ mutex_unlock(&vsock->tx_lock);
+
+ return pkt_len;
+}
+
+static struct virtio_transport_pkt_ops virtio_ops = {
+ .send_pkt = virtio_transport_send_pkt,
+};
+
+static void virtio_vsock_rx_fill(struct virtio_vsock *vsock)
+{
+ int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
+ struct virtio_vsock_pkt *pkt;
+ struct scatterlist hdr, buf, *sgs[2];
+ struct virtqueue *vq;
+ int ret;
+
+ vq = vsock->vqs[VSOCK_VQ_RX];
+
+ do {
+ pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
+ if (!pkt) {
+ pr_debug("%s: fail to allocate pkt\n", __func__);
+ goto out;
+ }
+
+ /* TODO: use mergeable rx buffer */
+ pkt->buf = kmalloc(buf_len, GFP_KERNEL);
+ if (!pkt->buf) {
+ pr_debug("%s: fail to allocate pkt->buf\n", __func__);
+ goto err;
+ }
+
+ sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
+ sgs[0] = &hdr;
+
+ sg_init_one(&buf, pkt->buf, buf_len);
+ sgs[1] = &buf;
+ ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL);
+ if (ret)
+ goto err;
+ vsock->rx_buf_nr++;
+ } while (vq->num_free);
+ if (vsock->rx_buf_nr > vsock->rx_buf_max_nr)
+ vsock->rx_buf_max_nr = vsock->rx_buf_nr;
+out:
+ virtqueue_kick(vq);
+ return;
+err:
+ virtqueue_kick(vq);
+ virtio_transport_free_pkt(pkt);
+ return;
+}
+
+static void virtio_transport_send_pkt_work(struct work_struct *work)
+{
+ struct virtio_vsock *vsock + container_of(work, struct virtio_vsock,
tx_work);
+ struct virtio_vsock_pkt *pkt;
+ bool added = false;
+ struct virtqueue *vq;
+ unsigned int len;
+ struct sock *sk;
+
+ vq = vsock->vqs[VSOCK_VQ_TX];
+ mutex_lock(&vsock->tx_lock);
+ do {
+ virtqueue_disable_cb(vq);
+ while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) {
+ sk = &pkt->trans->vsk->sk;
+ virtio_transport_dec_tx_pkt(pkt);
+ /* Release refcnt taken in virtio_transport_send_pkt */
+ sock_put(sk);
+ virtio_transport_free_pkt(pkt);
+ vsock->total_tx_buf -= len; /* TODO should this be pkt->len so the
guest cannot influence our tx buffer space? */
+ added = true;
+ }
+ } while (!virtqueue_enable_cb(vq));
+ mutex_unlock(&vsock->tx_lock);
+
+ if (added)
+ wake_up(&vsock->queue_wait);
+}
+
+static void virtio_transport_recv_pkt_work(struct work_struct *work)
+{
+ struct virtio_vsock *vsock + container_of(work, struct virtio_vsock,
rx_work);
+ struct virtio_vsock_pkt *pkt;
+ struct virtqueue *vq;
+ unsigned int len;
+
+ vq = vsock->vqs[VSOCK_VQ_RX];
+ mutex_lock(&vsock->rx_lock);
+ do {
+ virtqueue_disable_cb(vq);
+ while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) {
+ pkt->len = len;
+ virtio_transport_recv_pkt(pkt);
+ vsock->rx_buf_nr--;
+ }
+ } while (!virtqueue_enable_cb(vq));
+
+ if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2)
+ virtio_vsock_rx_fill(vsock);
+ mutex_unlock(&vsock->rx_lock);
+}
+
+static void virtio_vsock_ctrl_done(struct virtqueue *vq)
+{
+}
+
+static void virtio_vsock_tx_done(struct virtqueue *vq)
+{
+ struct virtio_vsock *vsock = vq->vdev->priv;
+
+ if (!vsock)
+ return;
+ queue_work(virtio_vsock_workqueue, &vsock->tx_work);
+}
+
+static void virtio_vsock_rx_done(struct virtqueue *vq)
+{
+ struct virtio_vsock *vsock = vq->vdev->priv;
+
+ if (!vsock)
+ return;
+ queue_work(virtio_vsock_workqueue, &vsock->rx_work);
+}
+
+static int
+virtio_transport_socket_init(struct vsock_sock *vsk, struct vsock_sock *psk)
+{
+ struct virtio_transport *trans;
+ int ret;
+
+ ret = virtio_transport_do_socket_init(vsk, psk);
+ if (ret)
+ return ret;
+
+ trans = vsk->trans;
+ trans->ops = &virtio_ops;
+ return ret;
+}
+
+static struct vsock_transport virtio_transport = {
+ .get_local_cid = virtio_transport_get_local_cid,
+
+ .init = virtio_transport_socket_init,
+ .destruct = virtio_transport_destruct,
+ .release = virtio_transport_release,
+ .connect = virtio_transport_connect,
+ .shutdown = virtio_transport_shutdown,
+
+ .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,
+
+ .set_buffer_size = virtio_transport_set_buffer_size,
+ .set_min_buffer_size = virtio_transport_set_min_buffer_size,
+ .set_max_buffer_size = virtio_transport_set_max_buffer_size,
+ .get_buffer_size = virtio_transport_get_buffer_size,
+ .get_min_buffer_size = virtio_transport_get_min_buffer_size,
+ .get_max_buffer_size = virtio_transport_get_max_buffer_size,
+};
+
+static int virtio_vsock_probe(struct virtio_device *vdev)
+{
+ vq_callback_t *callbacks[] = {
+ virtio_vsock_ctrl_done,
+ virtio_vsock_rx_done,
+ virtio_vsock_tx_done,
+ };
+ const char *names[] = {
+ "ctrl",
+ "rx",
+ "tx",
+ };
+ struct virtio_vsock *vsock;
+ int ret = -ENOMEM;
+ u32 guest_cid;
+
+ /* Only one virtio-vsock device per guest is supported */
+ /* FIXME: need lock for the_virtio_vsock ?*/
+ if (the_virtio_vsock)
+ return -EBUSY;
+
+ vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
+ if (!vsock)
+ return -ENOMEM;
+
+ vsock->vdev = vdev;
+
+ ret = vsock->vdev->config->find_vqs(vsock->vdev, VSOCK_VQ_MAX,
+ vsock->vqs, callbacks, names);
+ if (ret < 0)
+ goto out;
+
+ vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid),
+ &guest_cid, sizeof(guest_cid));
+ vsock->guest_cid = le32_to_cpu(guest_cid);
+ pr_debug("%s:guest_cid=%d\n", __func__, vsock->guest_cid);
+
+ ret = vsock_core_init(&virtio_transport);
+ if (ret < 0)
+ goto out_vqs;
+
+ vsock->rx_buf_nr = 0;
+ vsock->rx_buf_max_nr = 0;
+
+ vdev->priv = the_virtio_vsock = vsock;
+ init_waitqueue_head(&vsock->queue_wait);
+ mutex_init(&vsock->tx_lock);
+ mutex_init(&vsock->rx_lock);
+ INIT_WORK(&vsock->rx_work, virtio_transport_recv_pkt_work);
+ INIT_WORK(&vsock->tx_work, virtio_transport_send_pkt_work);
+
+ mutex_lock(&vsock->rx_lock);
+ virtio_vsock_rx_fill(vsock);
+ mutex_unlock(&vsock->rx_lock);
+ return 0;
+
+out_vqs:
+ vsock->vdev->config->del_vqs(vsock->vdev);
+out:
+ kfree(vsock);
+ return ret;
+}
+
+static void virtio_vsock_remove(struct virtio_device *vdev)
+{
+ struct virtio_vsock *vsock = vdev->priv;
+
+ the_virtio_vsock = NULL;
+ vsock_core_exit();
+ kfree(vsock);
+}
+
+static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static unsigned int features[] = {
+};
+
+static struct virtio_driver virtio_vsock_driver = {
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = virtio_vsock_probe,
+ .remove = virtio_vsock_remove,
+};
+
+static int __init virtio_vsock_init(void)
+{
+ int ret;
+
+ virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0);
+ if (!virtio_vsock_workqueue)
+ return -ENOMEM;
+ ret = register_virtio_driver(&virtio_vsock_driver);
+ if (ret)
+ destroy_workqueue(virtio_vsock_workqueue);
+ return ret;
+}
+
+static void __exit virtio_vsock_exit(void)
+{
+ unregister_virtio_driver(&virtio_vsock_driver);
+ destroy_workqueue(virtio_vsock_workqueue);
+}
+
+module_init(virtio_vsock_init);
+module_exit(virtio_vsock_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Asias He");
+MODULE_DESCRIPTION("virtio transport for vsock");
+MODULE_DEVICE_TABLE(virtio, id_table);
--
2.4.1
From: Asias He <asias at redhat.com>
VM sockets vhost transport implementation. This module runs in host
kernel.
Signed-off-by: Asias He <asias at redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha at redhat.com>
---
drivers/vhost/vsock.c | 596 ++++++++++++++++++++++++++++++++++++++++++++++++++
drivers/vhost/vsock.h | 4 +
2 files changed, 600 insertions(+)
create mode 100644 drivers/vhost/vsock.c
create mode 100644 drivers/vhost/vsock.h
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
new file mode 100644
index 0000000..a9514aa
--- /dev/null
+++ b/drivers/vhost/vsock.c
@@ -0,0 +1,596 @@
+/*
+ * vhost transport for vsock
+ *
+ * Copyright (C) 2013-2015 Red Hat, Inc.
+ * Author: Asias He <asias at redhat.com>
+ * Stefan Hajnoczi <stefanha at redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <net/sock.h>
+#include <linux/virtio_vsock.h>
+#include <linux/vhost.h>
+
+#include <net/af_vsock.h>
+#include "vhost.h"
+#include "vsock.h"
+
+#define VHOST_VSOCK_DEFAULT_HOST_CID 2
+
+static int vhost_transport_socket_init(struct vsock_sock *vsk,
+ struct vsock_sock *psk);
+
+enum {
+ VHOST_VSOCK_FEATURES = VHOST_FEATURES,
+};
+
+/* Used to track all the vhost_vsock instances on the system. */
+static LIST_HEAD(vhost_vsock_list);
+static DEFINE_MUTEX(vhost_vsock_mutex);
+
+struct vhost_vsock_virtqueue {
+ struct vhost_virtqueue vq;
+};
+
+struct vhost_vsock {
+ /* Vhost device */
+ struct vhost_dev dev;
+ /* Vhost vsock virtqueue*/
+ struct vhost_vsock_virtqueue vqs[VSOCK_VQ_MAX];
+ /* Link to global vhost_vsock_list*/
+ struct list_head list;
+ /* Head for pkt from host to guest */
+ struct list_head send_pkt_list;
+ /* Work item to send pkt */
+ struct vhost_work send_pkt_work;
+ /* Wait queue for send pkt */
+ wait_queue_head_t queue_wait;
+ /* Used for global tx buf limitation */
+ u32 total_tx_buf;
+ /* Guest contex id this vhost_vsock instance handles */
+ u32 guest_cid;
+};
+
+static u32 vhost_transport_get_local_cid(void)
+{
+ u32 cid = VHOST_VSOCK_DEFAULT_HOST_CID;
+ return cid;
+}
+
+static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
+{
+ struct vhost_vsock *vsock;
+
+ mutex_lock(&vhost_vsock_mutex);
+ list_for_each_entry(vsock, &vhost_vsock_list, list) {
+ if (vsock->guest_cid == guest_cid) {
+ mutex_unlock(&vhost_vsock_mutex);
+ return vsock;
+ }
+ }
+ mutex_unlock(&vhost_vsock_mutex);
+
+ return NULL;
+}
+
+static void
+vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
+ struct vhost_virtqueue *vq)
+{
+ struct virtio_vsock_pkt *pkt;
+ bool added = false;
+ unsigned out, in;
+ struct sock *sk;
+ int head, ret;
+
+ mutex_lock(&vq->mutex);
+ vhost_disable_notify(&vsock->dev, vq);
+ for (;;) {
+ if (list_empty(&vsock->send_pkt_list)) {
+ vhost_enable_notify(&vsock->dev, vq);
+ break;
+ }
+
+ head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
+ &out, &in, NULL, NULL);
+ pr_debug("%s: head = %d\n", __func__, head);
+ if (head < 0)
+ break;
+
+ if (head == vq->num) {
+ if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
+ vhost_disable_notify(&vsock->dev, vq);
+ continue;
+ }
+ break;
+ }
+
+ /* TODO check out == 0 and in >= 1 */
+
+ pkt = list_first_entry(&vsock->send_pkt_list,
+ struct virtio_vsock_pkt, list);
+ list_del_init(&pkt->list);
+
+ /* FIXME: no assumption of frame layout */
+ ret = __copy_to_user(vq->iov[0].iov_base, &pkt->hdr,
+ sizeof(pkt->hdr));
+ if (ret) {
+ virtio_transport_free_pkt(pkt);
+ vq_err(vq, "Faulted on copying pkt hdr\n");
+ break;
+ }
+ if (pkt->buf && pkt->len > 0) {
+ /* TODO avoid iov[1].iov_base buffer overflow, check pkt->len! */
+ ret = __copy_to_user(vq->iov[1].iov_base, pkt->buf,
+ pkt->len);
+ if (ret) {
+ virtio_transport_free_pkt(pkt);
+ vq_err(vq, "Faulted on copying pkt buf\n");
+ break;
+ }
+ }
+
+ vhost_add_used(vq, head, pkt->len);
+ added = true;
+
+ virtio_transport_dec_tx_pkt(pkt);
+ vsock->total_tx_buf -= pkt->len;
+
+ sk = sk_vsock(pkt->trans->vsk);
+ /* Release refcnt taken in vhost_transport_send_pkt */
+ sock_put(sk);
+
+ virtio_transport_free_pkt(pkt);
+ }
+ if (added)
+ vhost_signal(&vsock->dev, vq);
+ mutex_unlock(&vq->mutex);
+
+ if (added)
+ wake_up(&vsock->queue_wait);
+}
+
+static void vhost_transport_send_pkt_work(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq;
+ struct vhost_vsock *vsock;
+
+ vsock = container_of(work, struct vhost_vsock, send_pkt_work);
+ vq = &vsock->vqs[VSOCK_VQ_RX].vq;
+
+ vhost_transport_do_send_pkt(vsock, vq);
+}
+
+static int
+vhost_transport_send_pkt(struct vsock_sock *vsk,
+ struct virtio_vsock_pkt_info *info)
+{
+ u32 src_cid, src_port, dst_cid, dst_port;
+ struct virtio_transport *trans;
+ struct virtio_vsock_pkt *pkt;
+ struct vhost_virtqueue *vq;
+ struct vhost_vsock *vsock;
+ u32 pkt_len = info->pkt_len;
+ DEFINE_WAIT(wait);
+
+ src_cid = vhost_transport_get_local_cid();
+ src_port = vsk->local_addr.svm_port;
+ if (!info->remote_cid) {
+ dst_cid = vsk->remote_addr.svm_cid;
+ dst_port = vsk->remote_addr.svm_port;
+ } else {
+ dst_cid = info->remote_cid;
+ dst_port = info->remote_port;
+ }
+
+ /* Find the vhost_vsock according to guest context id */
+ vsock = vhost_vsock_get(dst_cid);
+ if (!vsock)
+ return -ENODEV;
+
+ trans = vsk->trans;
+ vq = &vsock->vqs[VSOCK_VQ_RX].vq;
+
+ /* we can send less than pkt_len bytes */
+ if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
+ pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
+
+ /* virtio_transport_get_credit might return less than pkt_len credit */
+ pkt_len = virtio_transport_get_credit(trans, pkt_len);
+
+ /* Do not send zero length OP_RW pkt*/
+ if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
+ return pkt_len;
+
+ /* Respect global tx buf limitation */
+ mutex_lock(&vq->mutex);
+ while (pkt_len + vsock->total_tx_buf > VIRTIO_VSOCK_MAX_TX_BUF_SIZE) {
+ prepare_to_wait_exclusive(&vsock->queue_wait, &wait,
+ TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&vq->mutex);
+ schedule();
+ mutex_lock(&vq->mutex);
+ finish_wait(&vsock->queue_wait, &wait);
+ }
+ vsock->total_tx_buf += pkt_len;
+ mutex_unlock(&vq->mutex);
+
+ pkt = virtio_transport_alloc_pkt(vsk, info, pkt_len,
+ src_cid, src_port,
+ dst_cid, dst_port);
+ if (!pkt) {
+ virtio_transport_put_credit(trans, pkt_len);
+ return -ENOMEM;
+ }
+
+ pr_debug("%s:info->pkt_len= %d\n", __func__, pkt_len);
+ /* Released in vhost_transport_do_send_pkt */
+ sock_hold(&trans->vsk->sk);
+ virtio_transport_inc_tx_pkt(pkt);
+
+ /* Queue it up in vhost work */
+ mutex_lock(&vq->mutex);
+ list_add_tail(&pkt->list, &vsock->send_pkt_list);
+ vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
+ mutex_unlock(&vq->mutex);
+
+ return pkt_len;
+}
+
+static struct virtio_transport_pkt_ops vhost_ops = {
+ .send_pkt = vhost_transport_send_pkt,
+};
+
+static struct virtio_vsock_pkt *
+vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq)
+{
+ struct virtio_vsock_pkt *pkt;
+ int ret;
+ int len;
+
+ pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
+ if (!pkt)
+ return NULL;
+
+ len = sizeof(pkt->hdr);
+ /* TODO check in and out. Support flexible descriptor lengths */
+ if (unlikely(vq->iov[0].iov_len != len)) {
+ vq_err(vq, "Expecting pkt->hdr = %d, got %zu bytes\n",
+ len, vq->iov[0].iov_len);
+ kfree(pkt);
+ return NULL;
+ }
+ ret = __copy_from_user(&pkt->hdr, vq->iov[0].iov_base, len);
+ if (ret) {
+ vq_err(vq, "Faulted on virtio_vsock_hdr\n");
+ kfree(pkt);
+ return NULL;
+ }
+
+ if (le16_to_cpu(pkt->hdr.type) == SOCK_DGRAM)
+ pkt->len = le32_to_cpu(pkt->hdr.len) & 0XFFFF;
+ else if (le16_to_cpu(pkt->hdr.type) == SOCK_STREAM)
+ pkt->len = le32_to_cpu(pkt->hdr.len);
+
+ /* No payload */
+ if (!pkt->len)
+ return pkt;
+
+ /* The pkt is too big */
+ if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
+ kfree(pkt);
+ return NULL;
+ }
+
+ pkt->buf = kmalloc(pkt->len, GFP_KERNEL);
+ if (!pkt->buf) {
+ kfree(pkt);
+ return NULL;
+ }
+
+ ret = __copy_from_user(pkt->buf, vq->iov[1].iov_base, pkt->len);
+ if (ret) {
+ vq_err(vq, "Faulted on virtio_vsock_hdr\n");
+ virtio_transport_free_pkt(pkt);
+ }
+
+ return pkt;
+}
+
+static void vhost_vsock_handle_ctl_kick(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
+ poll.work);
+ struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
+ dev);
+
+ pr_debug("%s vq=%p, vsock=%p\n", __func__, vq, vsock);
+}
+
+static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
+ poll.work);
+ struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
+ dev);
+ struct virtio_vsock_pkt *pkt;
+ int head, out, in;
+ bool added = false;
+ u32 len;
+
+ mutex_lock(&vq->mutex);
+ vhost_disable_notify(&vsock->dev, vq);
+ for (;;) {
+ head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
+ &out, &in, NULL, NULL);
+ if (head < 0)
+ break;
+
+ if (head == vq->num) {
+ if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
+ vhost_disable_notify(&vsock->dev, vq);
+ continue;
+ }
+ break;
+ }
+
+ pkt = vhost_vsock_alloc_pkt(vq);
+ if (!pkt) {
+ vq_err(vq, "Faulted on pkt\n");
+ continue;
+ }
+
+ len = pkt->len;
+ virtio_transport_recv_pkt(pkt);
+ vhost_add_used(vq, head, len);
+ added = true;
+ }
+ if (added)
+ vhost_signal(&vsock->dev, vq);
+ mutex_unlock(&vq->mutex);
+}
+
+static void vhost_vsock_handle_rx_kick(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
+ poll.work);
+ struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
+ dev);
+
+ vhost_transport_do_send_pkt(vsock, vq);
+}
+
+static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
+{
+ struct vhost_virtqueue **vqs;
+ struct vhost_vsock *vsock;
+ int ret;
+
+ vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
+ if (!vsock)
+ return -ENOMEM;
+
+ pr_debug("%s:vsock=%p\n", __func__, vsock);
+
+ vqs = kmalloc(VSOCK_VQ_MAX * sizeof(*vqs), GFP_KERNEL);
+ if (!vqs) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ vqs[VSOCK_VQ_CTRL] = &vsock->vqs[VSOCK_VQ_CTRL].vq;
+ vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX].vq;
+ vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX].vq;
+ vsock->vqs[VSOCK_VQ_CTRL].vq.handle_kick = vhost_vsock_handle_ctl_kick;
+ vsock->vqs[VSOCK_VQ_TX].vq.handle_kick = vhost_vsock_handle_tx_kick;
+ vsock->vqs[VSOCK_VQ_RX].vq.handle_kick = vhost_vsock_handle_rx_kick;
+
+ vhost_dev_init(&vsock->dev, vqs, VSOCK_VQ_MAX);
+
+ file->private_data = vsock;
+ init_waitqueue_head(&vsock->queue_wait);
+ INIT_LIST_HEAD(&vsock->send_pkt_list);
+ vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work);
+
+ mutex_lock(&vhost_vsock_mutex);
+ list_add_tail(&vsock->list, &vhost_vsock_list);
+ mutex_unlock(&vhost_vsock_mutex);
+ return 0;
+
+out:
+ kfree(vsock);
+ return ret;
+}
+
+static void vhost_vsock_flush(struct vhost_vsock *vsock)
+{
+ int i;
+
+ for (i = 0; i < VSOCK_VQ_MAX; i++)
+ vhost_poll_flush(&vsock->vqs[i].vq.poll);
+ vhost_work_flush(&vsock->dev, &vsock->send_pkt_work);
+}
+
+static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
+{
+ struct vhost_vsock *vsock = file->private_data;
+
+ mutex_lock(&vhost_vsock_mutex);
+ list_del(&vsock->list);
+ mutex_unlock(&vhost_vsock_mutex);
+
+ vhost_dev_stop(&vsock->dev);
+ vhost_vsock_flush(vsock);
+ vhost_dev_cleanup(&vsock->dev, false);
+ kfree(vsock->dev.vqs);
+ kfree(vsock);
+ return 0;
+}
+
+static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u32 guest_cid)
+{
+ mutex_lock(&vhost_vsock_mutex);
+ vsock->guest_cid = guest_cid;
+ pr_debug("%s:guest_cid=%d\n", __func__, guest_cid);
+ mutex_unlock(&vhost_vsock_mutex);
+
+ return 0;
+}
+
+static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
+{
+ struct vhost_virtqueue *vq;
+ int i;
+
+ if (features & ~VHOST_VSOCK_FEATURES)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&vsock->dev.mutex);
+ if ((features & (1 << VHOST_F_LOG_ALL)) &&
+ !vhost_log_access_ok(&vsock->dev)) {
+ mutex_unlock(&vsock->dev.mutex);
+ return -EFAULT;
+ }
+
+ for (i = 0; i < VSOCK_VQ_MAX; i++) {
+ vq = &vsock->vqs[i].vq;
+ mutex_lock(&vq->mutex);
+ vq->acked_features = features;
+ mutex_unlock(&vq->mutex);
+ }
+ mutex_unlock(&vsock->dev.mutex);
+ return 0;
+}
+
+static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl,
+ unsigned long arg)
+{
+ struct vhost_vsock *vsock = f->private_data;
+ void __user *argp = (void __user *)arg;
+ u64 __user *featurep = argp;
+ u32 __user *cidp = argp;
+ u32 guest_cid;
+ u64 features;
+ int r;
+
+ switch (ioctl) {
+ case VHOST_VSOCK_SET_GUEST_CID:
+ if (get_user(guest_cid, cidp))
+ return -EFAULT;
+ return vhost_vsock_set_cid(vsock, guest_cid);
+ case VHOST_GET_FEATURES:
+ features = VHOST_VSOCK_FEATURES;
+ if (copy_to_user(featurep, &features, sizeof(features)))
+ return -EFAULT;
+ return 0;
+ case VHOST_SET_FEATURES:
+ if (copy_from_user(&features, featurep, sizeof(features)))
+ return -EFAULT;
+ return vhost_vsock_set_features(vsock, features);
+ default:
+ mutex_lock(&vsock->dev.mutex);
+ r = vhost_dev_ioctl(&vsock->dev, ioctl, argp);
+ if (r == -ENOIOCTLCMD)
+ r = vhost_vring_ioctl(&vsock->dev, ioctl, argp);
+ else
+ vhost_vsock_flush(vsock);
+ mutex_unlock(&vsock->dev.mutex);
+ return r;
+ }
+}
+
+static const struct file_operations vhost_vsock_fops = {
+ .owner = THIS_MODULE,
+ .open = vhost_vsock_dev_open,
+ .release = vhost_vsock_dev_release,
+ .llseek = noop_llseek,
+ .unlocked_ioctl = vhost_vsock_dev_ioctl,
+};
+
+static struct miscdevice vhost_vsock_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "vhost-vsock",
+ .fops = &vhost_vsock_fops,
+};
+
+static int
+vhost_transport_socket_init(struct vsock_sock *vsk, struct vsock_sock *psk)
+{
+ struct virtio_transport *trans;
+ int ret;
+
+ ret = virtio_transport_do_socket_init(vsk, psk);
+ if (ret)
+ return ret;
+
+ trans = vsk->trans;
+ trans->ops = &vhost_ops;
+
+ return ret;
+}
+
+static struct vsock_transport vhost_transport = {
+ .get_local_cid = vhost_transport_get_local_cid,
+
+ .init = vhost_transport_socket_init,
+ .destruct = virtio_transport_destruct,
+ .release = virtio_transport_release,
+ .connect = virtio_transport_connect,
+ .shutdown = virtio_transport_shutdown,
+
+ .dgram_enqueue = virtio_transport_dgram_enqueue,
+ .dgram_dequeue = virtio_transport_dgram_dequeue,
+ .dgram_bind = virtio_transport_dgram_bind,
+ .dgram_allow = virtio_transport_dgram_allow,
+
+ .stream_enqueue = virtio_transport_stream_enqueue,
+ .stream_dequeue = virtio_transport_stream_dequeue,
+ .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,
+
+ .set_buffer_size = virtio_transport_set_buffer_size,
+ .set_min_buffer_size = virtio_transport_set_min_buffer_size,
+ .set_max_buffer_size = virtio_transport_set_max_buffer_size,
+ .get_buffer_size = virtio_transport_get_buffer_size,
+ .get_min_buffer_size = virtio_transport_get_min_buffer_size,
+ .get_max_buffer_size = virtio_transport_get_max_buffer_size,
+};
+
+static int __init vhost_vsock_init(void)
+{
+ int ret;
+
+ ret = vsock_core_init(&vhost_transport);
+ if (ret < 0)
+ return ret;
+ return misc_register(&vhost_vsock_misc);
+};
+
+static void __exit vhost_vsock_exit(void)
+{
+ misc_deregister(&vhost_vsock_misc);
+ vsock_core_exit();
+};
+
+module_init(vhost_vsock_init);
+module_exit(vhost_vsock_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Asias He");
+MODULE_DESCRIPTION("vhost transport for vsock ");
diff --git a/drivers/vhost/vsock.h b/drivers/vhost/vsock.h
new file mode 100644
index 0000000..0ddb107
--- /dev/null
+++ b/drivers/vhost/vsock.h
@@ -0,0 +1,4 @@
+#ifndef VHOST_VSOCK_H
+#define VHOST_VSOCK_H
+#define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u32)
+#endif
--
2.4.1
From: Asias He <asias at redhat.com> Enable virtio-vsock and vhost-vsock. Signed-off-by: Asias He <asias at redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha at redhat.com> --- drivers/vhost/Kconfig | 4 ++++ drivers/vhost/Kconfig.vsock | 7 +++++++ drivers/vhost/Makefile | 4 ++++ net/vmw_vsock/Kconfig | 18 ++++++++++++++++++ net/vmw_vsock/Makefile | 2 ++ 5 files changed, 35 insertions(+) create mode 100644 drivers/vhost/Kconfig.vsock diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig index 017a1e8..169fb19 100644 --- a/drivers/vhost/Kconfig +++ b/drivers/vhost/Kconfig @@ -32,3 +32,7 @@ config VHOST ---help--- This option is selected by any driver which needs to access the core of vhost. + +if STAGING +source "drivers/vhost/Kconfig.vsock" +endif diff --git a/drivers/vhost/Kconfig.vsock b/drivers/vhost/Kconfig.vsock new file mode 100644 index 0000000..3491865 --- /dev/null +++ b/drivers/vhost/Kconfig.vsock @@ -0,0 +1,7 @@ +config VHOST_VSOCK + tristate "vhost virtio-vsock driver" + depends on VSOCKETS && EVENTFD + select VIRTIO_VSOCKETS_COMMON + default n + ---help--- + Say M here to enable the vhost-vsock for virtio-vsock guests diff --git a/drivers/vhost/Makefile b/drivers/vhost/Makefile index e0441c3..6b012b9 100644 --- a/drivers/vhost/Makefile +++ b/drivers/vhost/Makefile @@ -4,5 +4,9 @@ vhost_net-y := net.o obj-$(CONFIG_VHOST_SCSI) += vhost_scsi.o vhost_scsi-y := scsi.o +obj-$(CONFIG_VHOST_VSOCK) += vhost_vsock.o +vhost_vsock-y := vsock.o + obj-$(CONFIG_VHOST_RING) += vringh.o + obj-$(CONFIG_VHOST) += vhost.o diff --git a/net/vmw_vsock/Kconfig b/net/vmw_vsock/Kconfig index 14810ab..74e0bc8 100644 --- a/net/vmw_vsock/Kconfig +++ b/net/vmw_vsock/Kconfig @@ -26,3 +26,21 @@ config VMWARE_VMCI_VSOCKETS To compile this driver as a module, choose M here: the module will be called vmw_vsock_vmci_transport. If unsure, say N. + +config VIRTIO_VSOCKETS + tristate "virtio transport for Virtual Sockets" + depends on VSOCKETS && VIRTIO + select VIRTIO_VSOCKETS_COMMON + help + This module implements a virtio transport for Virtual Sockets. + + Enable this transport if your Virtual Machine runs on Qemu/KVM. + + To compile this driver as a module, choose M here: the module + will be called virtio_vsock_transport. If unsure, say N. + +config VIRTIO_VSOCKETS_COMMON + tristate + ---help--- + This option is selected by any driver which needs to access + the virtio_vsock. diff --git a/net/vmw_vsock/Makefile b/net/vmw_vsock/Makefile index 2ce52d7..cf4c294 100644 --- a/net/vmw_vsock/Makefile +++ b/net/vmw_vsock/Makefile @@ -1,5 +1,7 @@ obj-$(CONFIG_VSOCKETS) += vsock.o obj-$(CONFIG_VMWARE_VMCI_VSOCKETS) += vmw_vsock_vmci_transport.o +obj-$(CONFIG_VIRTIO_VSOCKETS) += virtio_transport.o +obj-$(CONFIG_VIRTIO_VSOCKETS_COMMON) += virtio_transport_common.o vsock-y += af_vsock.o vsock_addr.o -- 2.4.1
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