[Devel] [PATCH RHEL7 COMMIT] ms/vsock: add 'transport' member in the struct vsock_sock
Vasily Averin
vvs at virtuozzo.com
Wed Apr 21 17:52:12 MSK 2021
The commit is pushed to "branch-rh7-3.10.0-1160.21.1.vz7.174.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1160.21.1.vz7.174.10
------>
commit 7a2beee60d3479f5739fa07751492562c0af04f5
Author: Stefano Garzarella <sgarzare at redhat.com>
Date: Wed Apr 21 17:52:12 2021 +0300
ms/vsock: add 'transport' member in the struct vsock_sock
As a preparation to support multiple transports, this patch adds
the 'transport' member at the 'struct vsock_sock'.
This new field is initialized during the creation in the
__vsock_create() function.
This patch also renames the global 'transport' pointer to
'transport_single', since for now we're only supporting a single
transport registered at run-time.
Reviewed-by: Stefan Hajnoczi <stefanha at redhat.com>
Reviewed-by: Jorgen Hansen <jhansen at vmware.com>
Signed-off-by: Stefano Garzarella <sgarzare at redhat.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
https://jira.sw.ru/browse/PSBM-128702
(cherry picked from commit fe502c4a38d97e5f8b9d5602af1f07f5abc529d2)
Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
---
include/net/af_vsock.h | 1 +
net/vmw_vsock/af_vsock.c | 58 ++++++++++++++++++++++++++++++++----------------
2 files changed, 40 insertions(+), 19 deletions(-)
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index 9eb8c93..7caa1a9 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -35,6 +35,7 @@ extern spinlock_t vsock_table_lock;
struct vsock_sock {
/* sk must be the first member. */
struct sock sk;
+ const struct vsock_transport *transport;
struct sockaddr_vm local_addr;
struct sockaddr_vm remote_addr;
/* Links for the global tables of bound and connected sockets. */
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 82dd645..b96df93 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -132,7 +132,7 @@ static struct proto vsock_proto = {
*/
#define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
-static const struct vsock_transport *transport;
+static const struct vsock_transport *transport_single;
static DEFINE_MUTEX(vsock_register_mutex);
/**** UTILS ****/
@@ -437,7 +437,9 @@ static bool vsock_is_pending(struct sock *sk)
static int vsock_send_shutdown(struct sock *sk, int mode)
{
- return transport->shutdown(vsock_sk(sk), mode);
+ struct vsock_sock *vsk = vsock_sk(sk);
+
+ return vsk->transport->shutdown(vsk, mode);
}
static void vsock_pending_work(struct work_struct *work)
@@ -544,7 +546,7 @@ static int __vsock_bind_stream(struct vsock_sock *vsk,
static int __vsock_bind_dgram(struct vsock_sock *vsk,
struct sockaddr_vm *addr)
{
- return transport->dgram_bind(vsk, addr);
+ return vsk->transport->dgram_bind(vsk, addr);
}
static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)
@@ -562,7 +564,7 @@ static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)
* like AF_INET prevents binding to a non-local IP address (in most
* cases), we only allow binding to the local CID.
*/
- cid = transport->get_local_cid();
+ cid = vsk->transport->get_local_cid();
if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY)
return -EADDRNOTAVAIL;
@@ -611,6 +613,7 @@ struct sock *__vsock_create(struct net *net,
sk->sk_type = type;
vsk = vsock_sk(sk);
+ vsk->transport = transport_single;
vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
@@ -641,7 +644,7 @@ struct sock *__vsock_create(struct net *net,
vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT;
}
- if (transport->init(vsk, psk) < 0) {
+ if (vsk->transport->init(vsk, psk) < 0) {
sk_free(sk);
return NULL;
}
@@ -663,7 +666,10 @@ static void __vsock_release(struct sock *sk)
vsk = vsock_sk(sk);
pending = NULL; /* Compiler warning. */
- transport->release(vsk);
+ /* The release call is supposed to use lock_sock_nested()
+ * rather than lock_sock(), if a sock lock should be acquired.
+ */
+ vsk->transport->release(vsk);
lock_sock(sk);
sock_orphan(sk);
@@ -687,7 +693,7 @@ static void vsock_sk_destruct(struct sock *sk)
{
struct vsock_sock *vsk = vsock_sk(sk);
- transport->destruct(vsk);
+ vsk->transport->destruct(vsk);
/* When clearing these addresses, there's no need to set the family and
* possibly register the address family with the kernel.
@@ -711,13 +717,13 @@ static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
s64 vsock_stream_has_data(struct vsock_sock *vsk)
{
- return transport->stream_has_data(vsk);
+ return vsk->transport->stream_has_data(vsk);
}
EXPORT_SYMBOL_GPL(vsock_stream_has_data);
s64 vsock_stream_has_space(struct vsock_sock *vsk)
{
- return transport->stream_has_space(vsk);
+ return vsk->transport->stream_has_space(vsk);
}
EXPORT_SYMBOL_GPL(vsock_stream_has_space);
@@ -886,6 +892,7 @@ static unsigned int vsock_poll(struct file *file, struct socket *sock,
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
} else if (sock->type == SOCK_STREAM) {
+ const struct vsock_transport *transport = vsk->transport;
lock_sock(sk);
/* Listening sockets that have connections in their accept
@@ -961,6 +968,7 @@ static int vsock_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
struct sock *sk;
struct vsock_sock *vsk;
struct sockaddr_vm *remote_addr;
+ const struct vsock_transport *transport;
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
@@ -969,6 +977,7 @@ static int vsock_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
err = 0;
sk = sock->sk;
vsk = vsock_sk(sk);
+ transport = vsk->transport;
lock_sock(sk);
@@ -1053,8 +1062,8 @@ static int vsock_dgram_connect(struct socket *sock,
if (err)
goto out;
- if (!transport->dgram_allow(remote_addr->svm_cid,
- remote_addr->svm_port)) {
+ if (!vsk->transport->dgram_allow(remote_addr->svm_cid,
+ remote_addr->svm_port)) {
err = -EINVAL;
goto out;
}
@@ -1070,8 +1079,9 @@ out:
static int vsock_dgram_recvmsg(struct kiocb *kiocb, struct socket *sock,
struct msghdr *msg, size_t len, int flags)
{
- return transport->dgram_dequeue(kiocb, vsock_sk(sock->sk), msg, len,
- flags);
+ struct vsock_sock *vsk = vsock_sk(sock->sk);
+
+ return vsk->transport->dgram_dequeue(kiocb, vsk, msg, len, flags);
}
static const struct proto_ops vsock_dgram_ops = {
@@ -1121,6 +1131,7 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
int err;
struct sock *sk;
struct vsock_sock *vsk;
+ const struct vsock_transport *transport;
struct sockaddr_vm *remote_addr;
long timeout;
DEFINE_WAIT(wait);
@@ -1128,6 +1139,7 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
err = 0;
sk = sock->sk;
vsk = vsock_sk(sk);
+ transport = vsk->transport;
lock_sock(sk);
@@ -1368,6 +1380,7 @@ static int vsock_stream_setsockopt(struct socket *sock,
int err;
struct sock *sk;
struct vsock_sock *vsk;
+ const struct vsock_transport *transport;
u64 val;
if (level != AF_VSOCK)
@@ -1388,6 +1401,7 @@ static int vsock_stream_setsockopt(struct socket *sock,
err = 0;
sk = sock->sk;
vsk = vsock_sk(sk);
+ transport = vsk->transport;
lock_sock(sk);
@@ -1445,6 +1459,7 @@ static int vsock_stream_getsockopt(struct socket *sock,
int len;
struct sock *sk;
struct vsock_sock *vsk;
+ const struct vsock_transport *transport;
u64 val;
if (level != AF_VSOCK)
@@ -1468,6 +1483,7 @@ static int vsock_stream_getsockopt(struct socket *sock,
err = 0;
sk = sock->sk;
vsk = vsock_sk(sk);
+ transport = vsk->transport;
switch (optname) {
case SO_VM_SOCKETS_BUFFER_SIZE:
@@ -1512,6 +1528,7 @@ static int vsock_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
{
struct sock *sk;
struct vsock_sock *vsk;
+ const struct vsock_transport *transport;
ssize_t total_written;
long timeout;
int err;
@@ -1521,6 +1538,7 @@ static int vsock_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
sk = sock->sk;
vsk = vsock_sk(sk);
+ transport = vsk->transport;
total_written = 0;
err = 0;
@@ -1657,6 +1675,7 @@ vsock_stream_recvmsg(struct kiocb *kiocb,
{
struct sock *sk;
struct vsock_sock *vsk;
+ const struct vsock_transport *transport;
int err;
size_t target;
ssize_t copied;
@@ -1667,6 +1686,7 @@ vsock_stream_recvmsg(struct kiocb *kiocb,
sk = sock->sk;
vsk = vsock_sk(sk);
+ transport = vsk->transport;
err = 0;
lock_sock(sk);
@@ -1881,7 +1901,7 @@ static long vsock_dev_do_ioctl(struct file *filp,
switch (cmd) {
case IOCTL_VM_SOCKETS_GET_LOCAL_CID:
- if (put_user(transport->get_local_cid(), p) != 0)
+ if (put_user(transport_single->get_local_cid(), p) != 0)
retval = -EFAULT;
break;
@@ -1928,7 +1948,7 @@ int __vsock_core_init(const struct vsock_transport *t, struct module *owner)
if (err)
return err;
- if (transport) {
+ if (transport_single) {
err = -EBUSY;
goto err_busy;
}
@@ -1937,7 +1957,7 @@ int __vsock_core_init(const struct vsock_transport *t, struct module *owner)
* unload while there are open sockets.
*/
vsock_proto.owner = owner;
- transport = t;
+ transport_single = t;
vsock_device.minor = MISC_DYNAMIC_MINOR;
err = misc_register(&vsock_device);
@@ -1967,7 +1987,7 @@ err_unregister_proto:
err_deregister_misc:
misc_deregister(&vsock_device);
err_reset_transport:
- transport = NULL;
+ transport_single = NULL;
err_busy:
mutex_unlock(&vsock_register_mutex);
return err;
@@ -1984,7 +2004,7 @@ void vsock_core_exit(void)
/* We do not want the assignment below re-ordered. */
mb();
- transport = NULL;
+ transport_single = NULL;
mutex_unlock(&vsock_register_mutex);
}
@@ -1995,7 +2015,7 @@ const struct vsock_transport *vsock_core_get_transport(void)
/* vsock_register_mutex not taken since only the transport uses this
* function and only while registered.
*/
- return transport;
+ return transport_single;
}
EXPORT_SYMBOL_GPL(vsock_core_get_transport);
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