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vhost-user: hoist "write_sync", "get_features", "get_u64"

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In order to avoid a forward-declaration for "vhost_user_write_sync" in a
subsequent patch, hoist "vhost_user_write_sync" ->
"vhost_user_get_features" -> "vhost_user_get_u64" just above
"vhost_set_vring".

This is purely code movement -- no observable change.

Cc: "Michael S. Tsirkin" <mst@redhat.com> (supporter:vhost)
Cc: Eugenio Perez Martin <eperezma@redhat.com>
Cc: German Maglione <gmaglione@redhat.com>
Cc: Liu Jiang <gerry@linux.alibaba.com>
Cc: Sergio Lopez Pascual <slp@redhat.com>
Cc: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Tested-by: Albert Esteve <aesteve@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20231002203221.17241-6-lersek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Laszlo Ersek 2023-10-02 22:32:19 +02:00 committed by Michael S. Tsirkin
parent 99ad9ec89d
commit df3b2abc32
1 changed files with 85 additions and 85 deletions
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170
hw/virtio/vhost-user.c
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@ -1073,6 +1073,91 @@ static int vhost_user_set_vring_endian(struct vhost_dev *dev,
return vhost_user_write(dev, &msg, NULL, 0);
}
static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t *u64)
{
int ret;
VhostUserMsg msg = {
.hdr.request = request,
.hdr.flags = VHOST_USER_VERSION,
};
if (vhost_user_per_device_request(request) && dev->vq_index != 0) {
return 0;
}
ret = vhost_user_write(dev, &msg, NULL, 0);
if (ret < 0) {
return ret;
}
ret = vhost_user_read(dev, &msg);
if (ret < 0) {
return ret;
}
if (msg.hdr.request != request) {
error_report("Received unexpected msg type. Expected %d received %d",
request, msg.hdr.request);
return -EPROTO;
}
if (msg.hdr.size != sizeof(msg.payload.u64)) {
error_report("Received bad msg size.");
return -EPROTO;
}
*u64 = msg.payload.u64;
return 0;
}
static int vhost_user_get_features(struct vhost_dev *dev, uint64_t *features)
{
if (vhost_user_get_u64(dev, VHOST_USER_GET_FEATURES, features) < 0) {
return -EPROTO;
}
return 0;
}
/* Note: "msg->hdr.flags" may be modified. */
static int vhost_user_write_sync(struct vhost_dev *dev, VhostUserMsg *msg,
bool wait_for_reply)
{
int ret;
if (wait_for_reply) {
bool reply_supported = virtio_has_feature(dev->protocol_features,
VHOST_USER_PROTOCOL_F_REPLY_ACK);
if (reply_supported) {
msg->hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
}
}
ret = vhost_user_write(dev, msg, NULL, 0);
if (ret < 0) {
return ret;
}
if (wait_for_reply) {
uint64_t dummy;
if (msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) {
return process_message_reply(dev, msg);
}
/*
* We need to wait for a reply but the backend does not
* support replies for the command we just sent.
* Send VHOST_USER_GET_FEATURES which makes all backends
* send a reply.
*/
return vhost_user_get_features(dev, &dummy);
}
return 0;
}
static int vhost_set_vring(struct vhost_dev *dev,
unsigned long int request,
struct vhost_vring_state *ring)
@ -1245,91 +1330,6 @@ static int vhost_user_set_vring_err(struct vhost_dev *dev,
return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_ERR, file);
}
static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t *u64)
{
int ret;
VhostUserMsg msg = {
.hdr.request = request,
.hdr.flags = VHOST_USER_VERSION,
};
if (vhost_user_per_device_request(request) && dev->vq_index != 0) {
return 0;
}
ret = vhost_user_write(dev, &msg, NULL, 0);
if (ret < 0) {
return ret;
}
ret = vhost_user_read(dev, &msg);
if (ret < 0) {
return ret;
}
if (msg.hdr.request != request) {
error_report("Received unexpected msg type. Expected %d received %d",
request, msg.hdr.request);
return -EPROTO;
}
if (msg.hdr.size != sizeof(msg.payload.u64)) {
error_report("Received bad msg size.");
return -EPROTO;
}
*u64 = msg.payload.u64;
return 0;
}
static int vhost_user_get_features(struct vhost_dev *dev, uint64_t *features)
{
if (vhost_user_get_u64(dev, VHOST_USER_GET_FEATURES, features) < 0) {
return -EPROTO;
}
return 0;
}
/* Note: "msg->hdr.flags" may be modified. */
static int vhost_user_write_sync(struct vhost_dev *dev, VhostUserMsg *msg,
bool wait_for_reply)
{
int ret;
if (wait_for_reply) {
bool reply_supported = virtio_has_feature(dev->protocol_features,
VHOST_USER_PROTOCOL_F_REPLY_ACK);
if (reply_supported) {
msg->hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
}
}
ret = vhost_user_write(dev, msg, NULL, 0);
if (ret < 0) {
return ret;
}
if (wait_for_reply) {
uint64_t dummy;
if (msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) {
return process_message_reply(dev, msg);
}
/*
* We need to wait for a reply but the backend does not
* support replies for the command we just sent.
* Send VHOST_USER_GET_FEATURES which makes all backends
* send a reply.
*/
return vhost_user_get_features(dev, &dummy);
}
return 0;
}
static int vhost_user_set_vring_addr(struct vhost_dev *dev,
struct vhost_vring_addr *addr)
{