Daemon specifies size of notification buffer needed and that should be
done using config space.
Only ->notify_buf_size value of config space comes from daemon. Rest of
it is filled by qemu device emulation code.
Signed-off-by: Vivek Goyal <vgo...@redhat.com>
Signed-off-by: Ioannis Angelakopoulos <iange...@redhat.com>
---
hw/virtio/vhost-user-fs.c | 27 +++++++++++++++++++
include/hw/virtio/vhost-user-fs.h | 2 ++
include/standard-headers/linux/virtio_fs.h | 2 ++
tools/virtiofsd/fuse_virtio.c | 31 ++++++++++++++++++++++
4 files changed, 62 insertions(+)
diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c
index 6bafcf0243..68a94708b4 100644
--- a/hw/virtio/vhost-user-fs.c
+++ b/hw/virtio/vhost-user-fs.c
@@ -36,15 +36,41 @@ static const int user_feature_bits[] = {
VHOST_INVALID_FEATURE_BIT
};
+static int vhost_user_fs_handle_config_change(struct vhost_dev *dev)
+{
+ return 0;
+}
+
+const VhostDevConfigOps fs_ops = {
+ .vhost_dev_config_notifier = vhost_user_fs_handle_config_change,
+};
+
static void vuf_get_config(VirtIODevice *vdev, uint8_t *config)
{
VHostUserFS *fs = VHOST_USER_FS(vdev);
struct virtio_fs_config fscfg = {};
+ Error *local_err = NULL;
+ int ret;
+
+ /*
+ * As of now we only get notification buffer size from device. And that's
+ * needed only if notification queue is enabled.
+ */
+ if (fs->notify_enabled) {
+ ret = vhost_dev_get_config(&fs->vhost_dev, (uint8_t *)&fs->fscfg,
+ sizeof(struct virtio_fs_config),
+ &local_err);
+ if (ret) {
+ error_report_err(local_err);
+ return;
+ }
+ }
memcpy((char *)fscfg.tag, fs->conf.tag,
MIN(strlen(fs->conf.tag) + 1, sizeof(fscfg.tag)));
virtio_stl_p(vdev, &fscfg.num_request_queues, fs->conf.num_request_queues);
+ virtio_stl_p(vdev, &fscfg.notify_buf_size, fs->fscfg.notify_buf_size);
memcpy(config, &fscfg, sizeof(fscfg));
}
@@ -316,6 +342,7 @@ static void vuf_device_realize(DeviceState *dev, Error
**errp)
sizeof(struct virtio_fs_config));
vuf_create_vqs(vdev, true);
+ vhost_dev_set_config_notifier(&fs->vhost_dev, &fs_ops);
ret = vhost_dev_init(&fs->vhost_dev, &fs->vhost_user,
VHOST_BACKEND_TYPE_USER, 0, errp);
if (ret < 0) {
diff --git a/include/hw/virtio/vhost-user-fs.h
b/include/hw/virtio/vhost-user-fs.h
index 95dc0dd402..3b114ee260 100644
--- a/include/hw/virtio/vhost-user-fs.h
+++ b/include/hw/virtio/vhost-user-fs.h
@@ -14,6 +14,7 @@
#ifndef _QEMU_VHOST_USER_FS_H
#define _QEMU_VHOST_USER_FS_H
+#include "standard-headers/linux/virtio_fs.h"
#include "hw/virtio/virtio.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-user.h"
@@ -37,6 +38,7 @@ struct VHostUserFS {
struct vhost_virtqueue *vhost_vqs;
struct vhost_dev vhost_dev;
VhostUserState vhost_user;
+ struct virtio_fs_config fscfg;
VirtQueue **req_vqs;
VirtQueue *hiprio_vq;
VirtQueue *notification_vq;
diff --git a/include/standard-headers/linux/virtio_fs.h
b/include/standard-headers/linux/virtio_fs.h
index b7f015186e..867d18acf6 100644
--- a/include/standard-headers/linux/virtio_fs.h
+++ b/include/standard-headers/linux/virtio_fs.h
@@ -17,6 +17,8 @@ struct virtio_fs_config {
/* Number of request queues */
uint32_t num_request_queues;
+ /* Size of notification buffer */
+ uint32_t notify_buf_size;
} QEMU_PACKED;
/* For the id field in virtio_pci_shm_cap */
diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c
index f5b87a508a..3b720c5d4a 100644
--- a/tools/virtiofsd/fuse_virtio.c
+++ b/tools/virtiofsd/fuse_virtio.c
@@ -856,6 +856,35 @@ static bool fv_queue_order(VuDev *dev, int qidx)
return false;
}
+static uint64_t fv_get_protocol_features(VuDev *dev)
+{
+ return 1ull << VHOST_USER_PROTOCOL_F_CONFIG;
+}
+
+static int fv_get_config(VuDev *dev, uint8_t *config, uint32_t len)
+{
+ struct virtio_fs_config fscfg = {};
+ unsigned notify_size, roundto = 64;
+ union fuse_notify_union {
+ struct fuse_notify_poll_wakeup_out wakeup_out;
+ struct fuse_notify_inval_inode_out inode_out;
+ struct fuse_notify_inval_entry_out entry_out;
+ struct fuse_notify_delete_out delete_out;
+ struct fuse_notify_store_out store_out;
+ struct fuse_notify_retrieve_out retrieve_out;
+ };
+
+ notify_size = sizeof(struct fuse_out_header) +
+ sizeof(union fuse_notify_union);
+ notify_size = ((notify_size + roundto) / roundto) * roundto;
+
+ fscfg.notify_buf_size = notify_size;
+ memcpy(config, &fscfg, len);
+ fuse_log(FUSE_LOG_DEBUG, "%s:Setting notify_buf_size=%d\n", __func__,
+ fscfg.notify_buf_size);
+ return 0;
+}
+
static const VuDevIface fv_iface = {
.get_features = fv_get_features,
.set_features = fv_set_features,
@@ -864,6 +893,8 @@ static const VuDevIface fv_iface = {
.queue_set_started = fv_queue_set_started,
.queue_is_processed_in_order = fv_queue_order,
+ .get_protocol_features = fv_get_protocol_features,
+ .get_config = fv_get_config,
};
/*
--
2.31.1
